qc-text-builder/internal/httpserver/handlers/ui.go

package handlers

import (
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
	"regexp"
	"sort"
	"strconv"
	"strings"
	"unicode"

	"github.com/go-chi/chi/v5"

	"qctextbuilder/internal/buildsvc"
	"qctextbuilder/internal/config"
	"qctextbuilder/internal/domain"
	"qctextbuilder/internal/draftsvc"
	"qctextbuilder/internal/onboarding"
	"qctextbuilder/internal/templatesvc"
)

type UI struct {
	templateSvc *templatesvc.Service
	onboardSvc  *onboarding.Service
	draftSvc    *draftsvc.Service
	buildSvc    buildsvc.Service
	cfg         config.Config
	render      htmlRenderer
}

type htmlRenderer interface {
	Render(w http.ResponseWriter, name string, data any)
}

type pageData struct {
	Title   string
	Msg     string
	Err     string
	Current string
}

type homePageData struct {
	pageData
	TemplateCount int
}

type settingsPageData struct {
	pageData
	QCBaseURL           string
	PollIntervalSeconds int
	PollTimeoutSeconds  int
	PollMaxConcurrent   int
	TokenConfigured     bool
	LanguageOutputMode  string
}

type templatesPageData struct {
	pageData
	Templates []domain.Template
}

type templateFieldView struct {
	Path           string
	FieldKind      string
	IsEnabled      bool
	IsRequiredByUs bool
	DisplayLabel   string
	DisplayOrder   int
	WebsiteSection string
	Notes          string
	SampleValue    string
}

type websiteSectionOptionView struct {
	Value string
	Label string
}

type templateDetailPageData struct {
	pageData
	Detail                *templatesvc.TemplateDetail
	Fields                []templateFieldView
	WebsiteSectionOptions []websiteSectionOptionView
}

type buildFieldView struct {
	Index        int
	Path         string
	DisplayLabel string
	SampleValue  string
	Value        string
}

type buildFieldGroupView struct {
	Title  string
	Fields []buildFieldView
}

type buildFieldSectionView struct {
	Key            string
	Title          string
	Description    string
	EditableGroups []buildFieldGroupView
	EditableFields []buildFieldView
	DisabledFields []buildFieldView
}

type pendingField struct {
	Field domain.TemplateField
	View  buildFieldView
}

type fieldRole struct {
	Label string
	Order int
}

var blockIDPattern = regexp.MustCompile(`(?i)(?:^|[_.])([mcr]\d{3,})(?:[_.]|$)`)
var looseBlockIDPattern = regexp.MustCompile(`(?i)([mcr]\d{3,})`)

var knownBlockAreas = map[string]string{
	"m1710": "Hero / Haupttitel",
	"c7886": "Intro / Einleitung",
	"r4830": "Services",
	"m4178": "Gallery / Medien",
	"c2929": "Ueber uns / About",
	"r4748": "Team",
	"r1508": "Testimonials",
	"c1165": "CTA / Highlight / Banner",
}

type buildNewPageData struct {
	pageData
	Templates          []domain.Template
	Drafts             []domain.BuildDraft
	SelectedDraftID    string
	SelectedTemplateID int64
	SelectedManifestID string
	FieldSections      []buildFieldSectionView
	EditableFields     []buildFieldView
	EnabledFields      []buildFieldView
	Form               buildFormInput
}

type buildFormInput struct {
	DraftID          string
	DraftSource      string
	DraftStatus      string
	DraftNotes       string
	RequestName      string
	CompanyName      string
	BusinessType     string
	Username         string
	Email            string
	Phone            string
	OrgNumber        string
	StartDate        string
	Mission          string
	DescriptionShort string
	DescriptionLong  string
	SiteLanguage     string
	AddressLine1     string
	AddressLine2     string
	AddressCity      string
	AddressRegion    string
	AddressZIP       string
	AddressCountry   string
}

type buildDetailPageData struct {
	pageData
	Build              *domain.SiteBuild
	EffectiveGlobal    []byte
	CanPoll            bool
	CanFetchEditorURL  bool
	AutoRefreshSeconds int
}

func NewUI(templateSvc *templatesvc.Service, onboardSvc *onboarding.Service, draftSvc *draftsvc.Service, buildSvc buildsvc.Service, cfg config.Config, render htmlRenderer) *UI {
	return &UI{templateSvc: templateSvc, onboardSvc: onboardSvc, draftSvc: draftSvc, buildSvc: buildSvc, cfg: cfg, render: render}
}

func (u *UI) Home(w http.ResponseWriter, r *http.Request) {
	templates, err := u.templateSvc.ListTemplates(r.Context())
	if err != nil {
		u.render.Render(w, "home", homePageData{pageData: basePageData(r, "Home", "/"), TemplateCount: 0})
		return
	}
	u.render.Render(w, "home", homePageData{pageData: basePageData(r, "Home", "/"), TemplateCount: len(templates)})
}

func (u *UI) Settings(w http.ResponseWriter, r *http.Request) {
	u.render.Render(w, "settings", settingsPageData{
		pageData:            basePageData(r, "Settings", "/settings"),
		QCBaseURL:           u.cfg.QCBaseURL,
		PollIntervalSeconds: u.cfg.PollIntervalSeconds,
		PollTimeoutSeconds:  u.cfg.PollTimeoutSeconds,
		PollMaxConcurrent:   u.cfg.PollMaxConcurrent,
		TokenConfigured:     strings.TrimSpace(u.cfg.QCToken) != "",
		LanguageOutputMode:  "EN",
	})
}

func (u *UI) Templates(w http.ResponseWriter, r *http.Request) {
	templates, err := u.templateSvc.ListTemplates(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	u.render.Render(w, "templates", templatesPageData{pageData: basePageData(r, "Templates", "/templates"), Templates: templates})
}

func (u *UI) SyncTemplates(w http.ResponseWriter, r *http.Request) {
	if _, err := u.templateSvc.SyncAITemplates(r.Context()); err != nil {
		http.Redirect(w, r, "/templates?err="+urlQuery(err.Error()), http.StatusSeeOther)
		return
	}
	http.Redirect(w, r, "/templates?msg=sync+done", http.StatusSeeOther)
}

func (u *UI) TemplateDetail(w http.ResponseWriter, r *http.Request) {
	templateID, ok := parseTemplateID(w, r)
	if !ok {
		return
	}
	detail, err := u.templateSvc.GetTemplateDetail(r.Context(), templateID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusNotFound)
		return
	}
	fields := make([]templateFieldView, 0, len(detail.Fields))
	for _, f := range detail.Fields {
		fields = append(fields, templateFieldView{
			Path:           f.Path,
			FieldKind:      f.FieldKind,
			IsEnabled:      f.IsEnabled,
			IsRequiredByUs: f.IsRequiredByUs,
			DisplayLabel:   f.DisplayLabel,
			DisplayOrder:   f.DisplayOrder,
			WebsiteSection: domain.NormalizeWebsiteSection(f.WebsiteSection),
			Notes:          f.Notes,
			SampleValue:    f.SampleValue,
		})
	}
	u.render.Render(w, "template_detail", templateDetailPageData{
		pageData:              basePageData(r, "Template Detail", "/templates"),
		Detail:                detail,
		Fields:                fields,
		WebsiteSectionOptions: websiteSectionOptions(),
	})
}

func (u *UI) OnboardTemplate(w http.ResponseWriter, r *http.Request) {
	templateID, ok := parseTemplateID(w, r)
	if !ok {
		return
	}
	if _, _, err := u.onboardSvc.OnboardTemplate(r.Context(), templateID); err != nil {
		http.Redirect(w, r, fmt.Sprintf("/templates/%d?err=%s", templateID, urlQuery(err.Error())), http.StatusSeeOther)
		return
	}
	http.Redirect(w, r, fmt.Sprintf("/templates/%d?msg=onboarding+done", templateID), http.StatusSeeOther)
}

func (u *UI) UpdateTemplateFields(w http.ResponseWriter, r *http.Request) {
	templateID, ok := parseTemplateID(w, r)
	if !ok {
		return
	}
	if err := r.ParseForm(); err != nil {
		http.Redirect(w, r, fmt.Sprintf("/templates/%d?err=%s", templateID, urlQuery("invalid form")), http.StatusSeeOther)
		return
	}

	count, _ := strconv.Atoi(r.FormValue("field_count"))
	patches := make([]onboarding.FieldPatch, 0, count)
	for i := 0; i < count; i++ {
		path := strings.TrimSpace(r.FormValue(fmt.Sprintf("field_path_%d", i)))
		if path == "" {
			continue
		}
		enabled := r.FormValue(fmt.Sprintf("field_enabled_%d", i)) == "on"
		required := r.FormValue(fmt.Sprintf("field_required_%d", i)) == "on"
		label := r.FormValue(fmt.Sprintf("field_label_%d", i))
		notes := r.FormValue(fmt.Sprintf("field_notes_%d", i))
		websiteSection := r.FormValue(fmt.Sprintf("field_website_section_%d", i))
		order, err := strconv.Atoi(strings.TrimSpace(r.FormValue(fmt.Sprintf("field_order_%d", i))))
		if err != nil {
			http.Redirect(w, r, fmt.Sprintf("/templates/%d?err=%s", templateID, urlQuery("invalid display order")), http.StatusSeeOther)
			return
		}
		patches = append(patches, onboarding.FieldPatch{
			Path:           path,
			IsEnabled:      boolPtr(enabled),
			IsRequiredByUs: boolPtr(required),
			DisplayLabel:   strPtr(label),
			DisplayOrder:   intPtr(order),
			WebsiteSection: strPtr(websiteSection),
			Notes:          strPtr(notes),
		})
	}

	manifestID := r.FormValue("manifest_id")
	if _, _, err := u.onboardSvc.UpdateTemplateFields(r.Context(), templateID, manifestID, patches); err != nil {
		http.Redirect(w, r, fmt.Sprintf("/templates/%d?err=%s", templateID, urlQuery(err.Error())), http.StatusSeeOther)
		return
	}
	http.Redirect(w, r, fmt.Sprintf("/templates/%d?msg=fields+saved", templateID), http.StatusSeeOther)
}

func (u *UI) BuildNew(w http.ResponseWriter, r *http.Request) {
	selectedTemplateID, _ := strconv.ParseInt(strings.TrimSpace(r.URL.Query().Get("template_id")), 10, 64)
	selectedDraftID := strings.TrimSpace(r.URL.Query().Get("draft_id"))
	form := buildFormInput{
		DraftID:     selectedDraftID,
		DraftSource: "ui",
		DraftStatus: "draft",
	}
	fieldValues := map[string]string{}
	if selectedDraftID != "" {
		draft, err := u.draftSvc.GetDraft(r.Context(), selectedDraftID)
		if err == nil {
			selectedTemplateID = draft.TemplateID
			form = buildFormInputFromDraft(draft)
			fieldValues = parseFieldValuesJSON(draft.FieldValuesJSON)
		}
	}
	data, err := u.loadBuildNewPageData(r, basePageData(r, "New Build", "/builds/new"), selectedDraftID, selectedTemplateID, form, fieldValues)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	u.render.Render(w, "build_new", data)
}

func (u *UI) CreateBuild(w http.ResponseWriter, r *http.Request) {
	if err := r.ParseForm(); err != nil {
		http.Redirect(w, r, "/builds/new?err=invalid+form", http.StatusSeeOther)
		return
	}

	form := buildFormInputFromRequest(r)
	fieldValues := parseBuildFieldValues(r)
	globalData := buildsvc.BuildGlobalData(buildsvc.GlobalDataInput{
		CompanyName:      form.CompanyName,
		BusinessType:     form.BusinessType,
		Username:         form.Username,
		Email:            form.Email,
		Phone:            form.Phone,
		OrgNumber:        form.OrgNumber,
		StartDate:        form.StartDate,
		Mission:          form.Mission,
		DescriptionShort: form.DescriptionShort,
		DescriptionLong:  form.DescriptionLong,
		SiteLanguage:     form.SiteLanguage,
		AddressLine1:     form.AddressLine1,
		AddressLine2:     form.AddressLine2,
		AddressCity:      form.AddressCity,
		AddressRegion:    form.AddressRegion,
		AddressZIP:       form.AddressZIP,
		AddressCountry:   form.AddressCountry,
	})

	templateID, err := strconv.ParseInt(strings.TrimSpace(r.FormValue("template_id")), 10, 64)
	if err != nil || templateID <= 0 {
		http.Redirect(w, r, "/builds/new?err=invalid+template", http.StatusSeeOther)
		return
	}

	result, err := u.buildSvc.StartBuild(r.Context(), buildsvc.StartBuildRequest{
		TemplateID:  templateID,
		RequestName: form.RequestName,
		GlobalData:  globalData,
		FieldValues: fieldValues,
	})
	if err != nil {
		data, loadErr := u.loadBuildNewPageData(r, pageData{
			Title:   "New Build",
			Err:     err.Error(),
			Current: "/builds/new",
		}, form.DraftID, templateID, form, fieldValues)
		if loadErr != nil {
			http.Error(w, loadErr.Error(), http.StatusBadRequest)
			return
		}
		u.render.Render(w, "build_new", data)
		return
	}

	if form.DraftID != "" {
		_, _ = u.draftSvc.SaveDraft(r.Context(), draftsvc.UpsertDraftRequest{
			DraftID:     form.DraftID,
			TemplateID:  templateID,
			ManifestID:  strings.TrimSpace(r.FormValue("manifest_id")),
			Source:      form.DraftSource,
			RequestName: form.RequestName,
			GlobalData:  globalData,
			FieldValues: fieldValues,
			Status:      "submitted",
			Notes:       form.DraftNotes,
		})
	}

	http.Redirect(w, r, fmt.Sprintf("/builds/%s?msg=build+started", result.BuildID), http.StatusSeeOther)
}

func (u *UI) SaveDraft(w http.ResponseWriter, r *http.Request) {
	if err := r.ParseForm(); err != nil {
		http.Redirect(w, r, "/builds/new?err=invalid+form", http.StatusSeeOther)
		return
	}
	form := buildFormInputFromRequest(r)
	fieldValues := parseBuildFieldValues(r)
	templateID, err := strconv.ParseInt(strings.TrimSpace(r.FormValue("template_id")), 10, 64)
	if err != nil || templateID <= 0 {
		http.Redirect(w, r, "/builds/new?err=invalid+template", http.StatusSeeOther)
		return
	}
	globalData := buildsvc.BuildGlobalData(buildsvc.GlobalDataInput{
		CompanyName:      form.CompanyName,
		BusinessType:     form.BusinessType,
		Username:         form.Username,
		Email:            form.Email,
		Phone:            form.Phone,
		OrgNumber:        form.OrgNumber,
		StartDate:        form.StartDate,
		Mission:          form.Mission,
		DescriptionShort: form.DescriptionShort,
		DescriptionLong:  form.DescriptionLong,
		SiteLanguage:     form.SiteLanguage,
		AddressLine1:     form.AddressLine1,
		AddressLine2:     form.AddressLine2,
		AddressCity:      form.AddressCity,
		AddressRegion:    form.AddressRegion,
		AddressZIP:       form.AddressZIP,
		AddressCountry:   form.AddressCountry,
	})
	draft, err := u.draftSvc.SaveDraft(r.Context(), draftsvc.UpsertDraftRequest{
		DraftID:     form.DraftID,
		TemplateID:  templateID,
		ManifestID:  strings.TrimSpace(r.FormValue("manifest_id")),
		Source:      form.DraftSource,
		RequestName: form.RequestName,
		GlobalData:  globalData,
		FieldValues: fieldValues,
		Status:      defaultDraftStatus(form.DraftStatus),
		Notes:       form.DraftNotes,
	})
	if err != nil {
		data, loadErr := u.loadBuildNewPageData(r, pageData{
			Title:   "New Build",
			Err:     err.Error(),
			Current: "/builds/new",
		}, form.DraftID, templateID, form, fieldValues)
		if loadErr != nil {
			http.Error(w, loadErr.Error(), http.StatusBadRequest)
			return
		}
		u.render.Render(w, "build_new", data)
		return
	}
	http.Redirect(w, r, fmt.Sprintf("/builds/new?template_id=%d&draft_id=%s&msg=draft+saved", templateID, urlQuery(draft.ID)), http.StatusSeeOther)
}

func (u *UI) BuildDetail(w http.ResponseWriter, r *http.Request) {
	buildID := strings.TrimSpace(chi.URLParam(r, "id"))
	build, err := u.buildSvc.GetBuild(r.Context(), buildID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusNotFound)
		return
	}

	status := strings.ToLower(strings.TrimSpace(build.QCStatus))
	canPoll := status == "queued" || status == "processing"
	canFetchEditor := (status == "done" || status == "failed" || status == "timeout") &&
		build.QCSiteID != nil &&
		strings.TrimSpace(build.QCEditorURL) == ""
	autoRefresh := 0
	if canPoll && u.cfg.PollIntervalSeconds > 0 {
		autoRefresh = u.cfg.PollIntervalSeconds
	}
	effectiveGlobal := build.GlobalDataJSON
	if payloadGlobal, err := extractGlobalDataFromFinalPayload(build.FinalSitesPayload); err == nil && len(payloadGlobal) > 0 {
		effectiveGlobal = payloadGlobal
	}
	u.render.Render(w, "build_detail", buildDetailPageData{
		pageData:           basePageData(r, "Build Detail", "/builds"),
		Build:              build,
		EffectiveGlobal:    effectiveGlobal,
		CanPoll:            canPoll,
		CanFetchEditorURL:  canFetchEditor,
		AutoRefreshSeconds: autoRefresh,
	})
}

func (u *UI) PollBuild(w http.ResponseWriter, r *http.Request) {
	buildID := strings.TrimSpace(chi.URLParam(r, "id"))
	if err := u.buildSvc.PollOnce(r.Context(), buildID); err != nil {
		http.Redirect(w, r, fmt.Sprintf("/builds/%s?err=%s", buildID, urlQuery(err.Error())), http.StatusSeeOther)
		return
	}
	http.Redirect(w, r, fmt.Sprintf("/builds/%s?msg=poll+done", buildID), http.StatusSeeOther)
}

func (u *UI) FetchEditorURL(w http.ResponseWriter, r *http.Request) {
	buildID := strings.TrimSpace(chi.URLParam(r, "id"))
	if err := u.buildSvc.FetchEditorURL(r.Context(), buildID); err != nil {
		http.Redirect(w, r, fmt.Sprintf("/builds/%s?err=%s", buildID, urlQuery(err.Error())), http.StatusSeeOther)
		return
	}
	http.Redirect(w, r, fmt.Sprintf("/builds/%s?msg=editor+url+loaded", buildID), http.StatusSeeOther)
}

func basePageData(r *http.Request, title, current string) pageData {
	q := r.URL.Query()
	return pageData{Title: title, Msg: q.Get("msg"), Err: q.Get("err"), Current: current}
}

func parseTemplateID(w http.ResponseWriter, r *http.Request) (int64, bool) {
	rawID := chi.URLParam(r, "id")
	templateID, err := strconv.ParseInt(rawID, 10, 64)
	if err != nil {
		http.Error(w, "invalid template id", http.StatusBadRequest)
		return 0, false
	}
	return templateID, true
}

func urlQuery(s string) string {
	return url.QueryEscape(s)
}

func boolPtr(v bool) *bool { return &v }
func intPtr(v int) *int    { return &v }
func strPtr(v string) *string {
	return &v
}

func (u *UI) loadBuildNewPageData(r *http.Request, page pageData, selectedDraftID string, selectedTemplateID int64, form buildFormInput, fieldValues map[string]string) (buildNewPageData, error) {
	templates, err := u.templateSvc.ListTemplates(r.Context())
	if err != nil {
		return buildNewPageData{}, err
	}
	drafts, err := u.draftSvc.ListDrafts(r.Context(), 50)
	if err != nil {
		return buildNewPageData{}, err
	}

	data := buildNewPageData{
		pageData:           page,
		Templates:          templates,
		Drafts:             drafts,
		SelectedDraftID:    selectedDraftID,
		SelectedTemplateID: selectedTemplateID,
		Form:               form,
	}
	if selectedTemplateID <= 0 {
		return data, nil
	}

	detail, err := u.templateSvc.GetTemplateDetail(r.Context(), selectedTemplateID)
	if err != nil || detail.Manifest == nil {
		return data, nil
	}
	data.SelectedManifestID = detail.Manifest.ID
	data.EditableFields, data.FieldSections = buildFieldSections(detail.Fields, fieldValues)
	data.EnabledFields = data.EditableFields
	return data, nil
}

func buildFieldSections(fields []domain.TemplateField, fieldValues map[string]string) ([]buildFieldView, []buildFieldSectionView) {
	sectionOrder := []string{
		domain.WebsiteSectionHero,
		domain.WebsiteSectionIntro,
		domain.WebsiteSectionServices,
		domain.WebsiteSectionAbout,
		domain.WebsiteSectionTeam,
		domain.WebsiteSectionTestimonials,
		domain.WebsiteSectionCTA,
		domain.WebsiteSectionContact,
		domain.WebsiteSectionGallery,
		domain.WebsiteSectionFooter,
		domain.WebsiteSectionOther,
	}

	sectionDescriptions := map[string]string{
		domain.WebsiteSectionHero:         "Headline-nahe Felder, bevorzugt nach Block-ID gruppiert.",
		domain.WebsiteSectionIntro:        "Intro-/Einleitungs-Felder, bevorzugt nach Block-ID gruppiert.",
		domain.WebsiteSectionServices:     "Services-Felder, bevorzugt nach Block-ID gruppiert.",
		domain.WebsiteSectionAbout:        "About-Felder, bevorzugt nach Block-ID gruppiert.",
		domain.WebsiteSectionTeam:         "Team-Felder, bevorzugt nach Block-ID gruppiert.",
		domain.WebsiteSectionTestimonials: "Testimonial-Felder, bevorzugt nach Block-ID gruppiert.",
		domain.WebsiteSectionCTA:          "CTA-/Highlight-Felder, bevorzugt nach Block-ID gruppiert.",
		domain.WebsiteSectionContact:      "Kontakt-Felder, bevorzugt nach Block-ID gruppiert.",
		domain.WebsiteSectionGallery:      "Media/Gallery-Felder, Bildfelder bleiben im MVP nicht editierbar.",
		domain.WebsiteSectionFooter:       "Footer-Felder, bevorzugt nach Block-ID gruppiert.",
		domain.WebsiteSectionOther:        "Aktive Textfelder ausserhalb der Kern-Sections, bevorzugt nach Block-ID gruppiert.",
	}

	sectionsByKey := make(map[string]buildFieldSectionView, len(sectionOrder))
	pendingByKey := make(map[string][]pendingField, len(sectionOrder))
	for _, key := range sectionOrder {
		sectionsByKey[key] = buildFieldSectionView{
			Key:         key,
			Title:       domain.WebsiteSectionLabel(key),
			Description: sectionDescriptions[key],
		}
	}

	for _, f := range fields {
		targetSection := preferredBuildSection(f)
		if isMediaOrGalleryField(f) || targetSection == domain.WebsiteSectionGallery {
			labelFallback := domain.WebsiteSectionLabel(domain.WebsiteSectionGallery) + " - " + humanizeKey(f.KeyName)
			if blockID := extractBlockID(f); blockID != "" {
				labelFallback = "Media - " + blockGroupTitle(blockID)
			}
			media := sectionsByKey[domain.WebsiteSectionGallery]
			media.DisabledFields = append(media.DisabledFields, buildFieldView{
				Path:         f.Path,
				DisplayLabel: effectiveLabel(f, labelFallback),
				SampleValue:  f.SampleValue,
				Value:        "",
			})
			sectionsByKey[domain.WebsiteSectionGallery] = media
			continue
		}
		if !f.IsEnabled || !strings.EqualFold(strings.TrimSpace(f.FieldKind), "text") {
			continue
		}
		pf := pendingField{
			Field: f,
			View: buildFieldView{
				Path:         f.Path,
				DisplayLabel: effectiveLabel(f, humanizeKey(f.KeyName)),
				SampleValue:  f.SampleValue,
				Value:        strings.TrimSpace(fieldValues[f.Path]),
			},
		}
		pendingByKey[targetSection] = append(pendingByKey[targetSection], pf)
	}

	for _, key := range sectionOrder {
		section := sectionsByKey[key]
		items := pendingByKey[key]
		switch key {
		case domain.WebsiteSectionServices:
			section = applyServicesGrouping(section, items)
		case domain.WebsiteSectionTestimonials:
			section = applyTestimonialsGrouping(section, items)
		case domain.WebsiteSectionHero, domain.WebsiteSectionIntro, domain.WebsiteSectionAbout, domain.WebsiteSectionTeam, domain.WebsiteSectionCTA, domain.WebsiteSectionContact, domain.WebsiteSectionFooter:
			section = applyTextGrouping(section, items)
		case domain.WebsiteSectionOther:
			section = applyOtherGrouping(section, items)
		case domain.WebsiteSectionGallery:
			// Gallery fields are handled as disabled entries only in this MVP.
		default:
			section = applyOtherGrouping(section, items)
		}
		sectionsByKey[key] = section
	}

	sections := make([]buildFieldSectionView, 0, len(sectionOrder))
	for _, key := range sectionOrder {
		sections = append(sections, sectionsByKey[key])
	}
	return assignEditableIndexes(sections)
}

func applyServicesGrouping(section buildFieldSectionView, fields []pendingField) buildFieldSectionView {
	return applyBlockFirstGrouping(section, fields, "Services", applyServicesGroupingFallback)
}

func applyServicesGroupingFallback(section buildFieldSectionView, fields []pendingField) buildFieldSectionView {
	titles := make([]pendingField, 0)
	descriptions := make([]pendingField, 0)
	other := make([]buildFieldView, 0)

	for _, pf := range fields {
		key := strings.ToLower(strings.TrimSpace(pf.Field.KeyName))
		switch {
		case strings.HasPrefix(key, "servicestitle_") || strings.HasPrefix(key, "servicestitle"):
			titles = append(titles, pf)
		case strings.HasPrefix(key, "servicesdescription_") || strings.HasPrefix(key, "servicesdescription"):
			descriptions = append(descriptions, pf)
		default:
			pf.View.DisplayLabel = effectiveLabel(pf.Field, "Services - "+humanizeKey(pf.Field.KeyName))
			other = append(other, pf.View)
		}
	}

	maxCount := len(titles)
	if len(descriptions) > maxCount {
		maxCount = len(descriptions)
	}
	for i := 0; i < maxCount; i++ {
		block := buildFieldGroupView{Title: fmt.Sprintf("Service %d", i+1)}
		if i < len(titles) {
			item := titles[i]
			item.View.DisplayLabel = effectiveLabel(item.Field, fmt.Sprintf("Service %d - Titel", i+1))
			block.Fields = append(block.Fields, item.View)
		}
		if i < len(descriptions) {
			item := descriptions[i]
			item.View.DisplayLabel = effectiveLabel(item.Field, fmt.Sprintf("Service %d - Beschreibung", i+1))
			block.Fields = append(block.Fields, item.View)
		}
		if len(block.Fields) > 0 {
			section.EditableGroups = append(section.EditableGroups, block)
		}
	}
	section.EditableFields = append(section.EditableFields, other...)
	return section
}

func applyTestimonialsGrouping(section buildFieldSectionView, fields []pendingField) buildFieldSectionView {
	return applyBlockFirstGrouping(section, fields, "Testimonials", applyTestimonialsGroupingFallback)
}

func applyTestimonialsGroupingFallback(section buildFieldSectionView, fields []pendingField) buildFieldSectionView {
	names := make([]pendingField, 0)
	titles := make([]pendingField, 0)
	descriptions := make([]pendingField, 0)
	other := make([]buildFieldView, 0)

	for _, pf := range fields {
		key := strings.ToLower(strings.TrimSpace(pf.Field.KeyName))
		switch {
		case strings.HasPrefix(key, "testimonialsname_") || strings.HasPrefix(key, "testimonialsname"):
			names = append(names, pf)
		case strings.HasPrefix(key, "testimonialstitle_") || strings.HasPrefix(key, "testimonialstitle"):
			titles = append(titles, pf)
		case strings.HasPrefix(key, "testimonialsdescription_") || strings.HasPrefix(key, "testimonialsdescription"):
			descriptions = append(descriptions, pf)
		default:
			pf.View.DisplayLabel = effectiveLabel(pf.Field, "Testimonials - "+humanizeKey(pf.Field.KeyName))
			other = append(other, pf.View)
		}
	}

	maxCount := len(names)
	if len(titles) > maxCount {
		maxCount = len(titles)
	}
	if len(descriptions) > maxCount {
		maxCount = len(descriptions)
	}
	for i := 0; i < maxCount; i++ {
		block := buildFieldGroupView{Title: fmt.Sprintf("Testimonial %d", i+1)}
		if i < len(names) {
			item := names[i]
			item.View.DisplayLabel = effectiveLabel(item.Field, fmt.Sprintf("Testimonial %d - Name", i+1))
			block.Fields = append(block.Fields, item.View)
		}
		if i < len(titles) {
			item := titles[i]
			item.View.DisplayLabel = effectiveLabel(item.Field, fmt.Sprintf("Testimonial %d - Titel", i+1))
			block.Fields = append(block.Fields, item.View)
		}
		if i < len(descriptions) {
			item := descriptions[i]
			item.View.DisplayLabel = effectiveLabel(item.Field, fmt.Sprintf("Testimonial %d - Beschreibung", i+1))
			block.Fields = append(block.Fields, item.View)
		}
		if len(block.Fields) > 0 {
			section.EditableGroups = append(section.EditableGroups, block)
		}
	}
	section.EditableFields = append(section.EditableFields, other...)
	return section
}

func applyTextGrouping(section buildFieldSectionView, fields []pendingField) buildFieldSectionView {
	return applyBlockFirstGrouping(section, fields, "Text", applyTextGroupingFallback)
}

func applyTextGroupingFallback(section buildFieldSectionView, fields []pendingField) buildFieldSectionView {
	titles := make([]pendingField, 0)
	descriptions := make([]pendingField, 0)
	names := make([]pendingField, 0)
	other := make([]buildFieldView, 0)

	for _, pf := range fields {
		key := strings.ToLower(strings.TrimSpace(pf.Field.KeyName))
		switch {
		case strings.HasPrefix(key, "texttitle_") || strings.HasPrefix(key, "texttitle") || strings.HasPrefix(key, "exttitle_") || strings.HasPrefix(key, "exttitle"):
			titles = append(titles, pf)
		case strings.HasPrefix(key, "textdescription_") || strings.HasPrefix(key, "textdescription") || strings.HasPrefix(key, "extdescription_") || strings.HasPrefix(key, "extdescription"):
			descriptions = append(descriptions, pf)
		case strings.HasPrefix(key, "textname_") || strings.HasPrefix(key, "textname") || strings.HasPrefix(key, "extname_") || strings.HasPrefix(key, "extname"):
			names = append(names, pf)
		default:
			pf.View.DisplayLabel = effectiveLabel(pf.Field, "Text - "+humanizeKey(pf.Field.KeyName))
			other = append(other, pf.View)
		}
	}

	maxCount := len(titles)
	if len(descriptions) > maxCount {
		maxCount = len(descriptions)
	}
	if len(names) > maxCount {
		maxCount = len(names)
	}
	for i := 0; i < maxCount; i++ {
		block := buildFieldGroupView{Title: fmt.Sprintf("Textblock %d", i+1)}
		if i < len(titles) {
			item := titles[i]
			item.View.DisplayLabel = effectiveLabel(item.Field, fmt.Sprintf("Textblock %d - Titel", i+1))
			block.Fields = append(block.Fields, item.View)
		}
		if i < len(descriptions) {
			item := descriptions[i]
			item.View.DisplayLabel = effectiveLabel(item.Field, fmt.Sprintf("Textblock %d - Beschreibung", i+1))
			block.Fields = append(block.Fields, item.View)
		}
		if i < len(names) {
			item := names[i]
			item.View.DisplayLabel = effectiveLabel(item.Field, fmt.Sprintf("Textblock %d - Name", i+1))
			block.Fields = append(block.Fields, item.View)
		}
		if len(block.Fields) > 0 {
			section.EditableGroups = append(section.EditableGroups, block)
		}
	}
	section.EditableFields = append(section.EditableFields, other...)
	return section
}

func applyOtherGrouping(section buildFieldSectionView, fields []pendingField) buildFieldSectionView {
	return applyBlockFirstGrouping(section, fields, "", applyOtherGroupingFallback)
}

func applyOtherGroupingFallback(section buildFieldSectionView, fields []pendingField) buildFieldSectionView {
	for _, pf := range fields {
		pf.View.DisplayLabel = effectiveLabel(pf.Field, normalizedSectionTitle(pf.Field.Section)+" - "+humanizeKey(pf.Field.KeyName))
		section.EditableFields = append(section.EditableFields, pf.View)
	}
	sort.SliceStable(section.EditableFields, func(i, j int) bool {
		return section.EditableFields[i].Path < section.EditableFields[j].Path
	})
	return section
}

func applyBlockFirstGrouping(section buildFieldSectionView, fields []pendingField, fallbackPrefix string, fallback func(buildFieldSectionView, []pendingField) buildFieldSectionView) buildFieldSectionView {
	grouped := map[string][]pendingField{}
	withoutBlockID := make([]pendingField, 0)
	for _, pf := range fields {
		blockID := extractBlockID(pf.Field)
		if blockID == "" {
			withoutBlockID = append(withoutBlockID, pf)
			continue
		}
		grouped[blockID] = append(grouped[blockID], pf)
	}

	if len(grouped) > 0 {
		blockIDs := make([]string, 0, len(grouped))
		for blockID := range grouped {
			blockIDs = append(blockIDs, blockID)
		}
		sort.SliceStable(blockIDs, func(i, j int) bool {
			li, lj := blockSortRank(blockIDs[i]), blockSortRank(blockIDs[j])
			if li != lj {
				return li < lj
			}
			return blockIDs[i] < blockIDs[j]
		})

		for _, blockID := range blockIDs {
			items := grouped[blockID]
			sort.SliceStable(items, func(i, j int) bool {
				ri := deriveFieldRole(items[i].Field.KeyName)
				rj := deriveFieldRole(items[j].Field.KeyName)
				if ri.Order != rj.Order {
					return ri.Order < rj.Order
				}
				return items[i].Field.Path < items[j].Field.Path
			})

			group := buildFieldGroupView{Title: blockGroupTitle(blockID)}
			for _, item := range items {
				role := deriveFieldRole(item.Field.KeyName)
				fallbackLabel := role.Label
				if fallbackLabel == "" {
					fallbackLabel = humanizeKey(item.Field.KeyName)
				}
				item.View.DisplayLabel = effectiveLabel(item.Field, fallbackLabel)
				group.Fields = append(group.Fields, item.View)
			}
			if len(group.Fields) > 0 {
				section.EditableGroups = append(section.EditableGroups, group)
			}
		}
	}

	if len(withoutBlockID) > 0 {
		if fallback != nil {
			return fallback(section, withoutBlockID)
		}
		for _, pf := range withoutBlockID {
			labelPrefix := fallbackPrefix
			if labelPrefix == "" {
				labelPrefix = normalizedSectionTitle(pf.Field.Section)
			}
			pf.View.DisplayLabel = effectiveLabel(pf.Field, labelPrefix+" - "+humanizeKey(pf.Field.KeyName))
			section.EditableFields = append(section.EditableFields, pf.View)
		}
	}
	return section
}

func extractBlockID(f domain.TemplateField) string {
	candidates := []string{f.KeyName, f.Path}
	for _, candidate := range candidates {
		normalized := strings.ToLower(strings.TrimSpace(candidate))
		if normalized == "" {
			continue
		}
		if match := blockIDPattern.FindStringSubmatch(normalized); len(match) > 1 {
			return match[1]
		}
		if match := looseBlockIDPattern.FindStringSubmatch(normalized); len(match) > 1 {
			return match[1]
		}
	}
	return ""
}

func blockGroupTitle(blockID string) string {
	blockID = strings.ToLower(strings.TrimSpace(blockID))
	if blockID == "" {
		return "Unbekannter Block"
	}
	if known, ok := knownBlockAreas[blockID]; ok {
		return fmt.Sprintf("%s (%s)", known, blockID)
	}
	return "Block " + blockID
}

func blockSortRank(blockID string) int {
	switch strings.ToLower(strings.TrimSpace(blockID)) {
	case "m1710":
		return 10
	case "c7886":
		return 20
	case "r4830":
		return 30
	case "c2929":
		return 40
	case "r4748":
		return 50
	case "r1508":
		return 60
	case "c1165":
		return 70
	case "m4178":
		return 80
	default:
		return 1000
	}
}

func deriveFieldRole(key string) fieldRole {
	normalized := strings.ToLower(strings.TrimSpace(key))
	switch {
	case strings.Contains(normalized, "subtitle"):
		return fieldRole{Label: "Untertitel", Order: 15}
	case strings.Contains(normalized, "title"):
		return fieldRole{Label: "Titel", Order: 20}
	case strings.Contains(normalized, "description"):
		return fieldRole{Label: "Beschreibung", Order: 30}
	case strings.Contains(normalized, "name"):
		return fieldRole{Label: "Name", Order: 40}
	case strings.Contains(normalized, "button") || strings.Contains(normalized, "cta"):
		return fieldRole{Label: "CTA Text", Order: 50}
	default:
		return fieldRole{Label: humanizeKey(key), Order: 100}
	}
}

func assignEditableIndexes(sections []buildFieldSectionView) ([]buildFieldView, []buildFieldSectionView) {
	editable := make([]buildFieldView, 0)
	nextIndex := 0
	for si := range sections {
		for gi := range sections[si].EditableGroups {
			for fi := range sections[si].EditableGroups[gi].Fields {
				sections[si].EditableGroups[gi].Fields[fi].Index = nextIndex
				editable = append(editable, sections[si].EditableGroups[gi].Fields[fi])
				nextIndex++
			}
		}
		for fi := range sections[si].EditableFields {
			sections[si].EditableFields[fi].Index = nextIndex
			editable = append(editable, sections[si].EditableFields[fi])
			nextIndex++
		}
	}
	return editable, sections
}

func preferredBuildSection(f domain.TemplateField) string {
	websiteSection := strings.TrimSpace(f.WebsiteSection)
	if websiteSection != "" {
		normalized := domain.NormalizeWebsiteSection(websiteSection)
		if normalized == domain.WebsiteSectionServiceItem {
			return domain.WebsiteSectionServices
		}
		return normalized
	}
	return fallbackBuildSection(f)
}

func fallbackBuildSection(f domain.TemplateField) string {
	switch normalizedSection(f.Section) {
	case "services":
		return domain.WebsiteSectionServices
	case "testimonials":
		return domain.WebsiteSectionTestimonials
	case "text":
		if isMediaOrGalleryField(f) {
			return domain.WebsiteSectionGallery
		}
		return domain.WebsiteSectionOther
	default:
		if isMediaOrGalleryField(f) {
			return domain.WebsiteSectionGallery
		}
		return domain.WebsiteSectionOther
	}
}

func normalizedSection(raw string) string {
	section := strings.ToLower(strings.TrimSpace(raw))
	switch section {
	case "ext":
		return "text"
	default:
		return section
	}
}

func normalizedSectionTitle(raw string) string {
	switch normalizedSection(raw) {
	case "text":
		return "Text"
	case "services":
		return "Services"
	case "testimonials":
		return "Testimonials"
	case "gallery", "media":
		return "Media"
	default:
		return "Feld"
	}
}

func isMediaOrGalleryField(f domain.TemplateField) bool {
	if strings.EqualFold(strings.TrimSpace(f.FieldKind), "image") {
		return true
	}
	section := strings.ToLower(strings.TrimSpace(f.Section))
	key := strings.ToLower(strings.TrimSpace(f.KeyName))
	path := strings.ToLower(strings.TrimSpace(f.Path))
	if section == "gallery" || section == "media" {
		return true
	}
	hints := []string{"gallery", "image", "img", "photo", "picture"}
	for _, hint := range hints {
		if strings.Contains(section, hint) || strings.Contains(key, hint) || strings.Contains(path, hint) {
			return true
		}
	}
	return false
}

func effectiveLabel(f domain.TemplateField, fallback string) string {
	if !isRawPathLikeLabel(f.DisplayLabel, f.Path) {
		return strings.TrimSpace(f.DisplayLabel)
	}
	return strings.TrimSpace(fallback)
}

func isRawPathLikeLabel(label string, path string) bool {
	l := strings.TrimSpace(label)
	if l == "" {
		return true
	}
	if strings.EqualFold(l, strings.TrimSpace(path)) {
		return true
	}
	if strings.Contains(l, ".") || strings.Contains(l, "_") {
		return true
	}
	return false
}

func humanizeKey(key string) string {
	raw := strings.TrimSpace(key)
	if raw == "" {
		return "Inhalt"
	}
	base := raw
	if idx := strings.Index(base, "_"); idx > 0 {
		base = base[:idx]
	}
	runes := make([]rune, 0, len(base)+4)
	for i, r := range base {
		if i > 0 && unicode.IsUpper(r) {
			runes = append(runes, ' ')
		}
		runes = append(runes, r)
	}
	human := strings.TrimSpace(string(runes))
	if human == "" {
		return "Inhalt"
	}
	words := strings.Fields(strings.ToLower(human))
	for i := range words {
		if len(words[i]) > 0 {
			words[i] = strings.ToUpper(words[i][:1]) + words[i][1:]
		}
	}
	return strings.Join(words, " ")
}

func buildFormInputFromRequest(r *http.Request) buildFormInput {
	return buildFormInput{
		DraftID:          strings.TrimSpace(r.FormValue("draft_id")),
		DraftSource:      strings.TrimSpace(r.FormValue("draft_source")),
		DraftStatus:      strings.TrimSpace(r.FormValue("draft_status")),
		DraftNotes:       strings.TrimSpace(r.FormValue("draft_notes")),
		RequestName:      strings.TrimSpace(r.FormValue("request_name")),
		CompanyName:      strings.TrimSpace(r.FormValue("company_name")),
		BusinessType:     strings.TrimSpace(r.FormValue("business_type")),
		Username:         strings.TrimSpace(r.FormValue("username")),
		Email:            strings.TrimSpace(r.FormValue("email")),
		Phone:            strings.TrimSpace(r.FormValue("phone")),
		OrgNumber:        strings.TrimSpace(r.FormValue("org_number")),
		StartDate:        strings.TrimSpace(r.FormValue("start_date")),
		Mission:          strings.TrimSpace(r.FormValue("mission")),
		DescriptionShort: strings.TrimSpace(r.FormValue("description_short")),
		DescriptionLong:  strings.TrimSpace(r.FormValue("description_long")),
		SiteLanguage:     strings.TrimSpace(r.FormValue("site_language")),
		AddressLine1:     strings.TrimSpace(r.FormValue("address_line1")),
		AddressLine2:     strings.TrimSpace(r.FormValue("address_line2")),
		AddressCity:      strings.TrimSpace(r.FormValue("address_city")),
		AddressRegion:    strings.TrimSpace(r.FormValue("address_region")),
		AddressZIP:       strings.TrimSpace(r.FormValue("address_zip")),
		AddressCountry:   strings.TrimSpace(r.FormValue("address_country")),
	}
}

func buildFormInputFromDraft(draft *domain.BuildDraft) buildFormInput {
	form := buildFormInput{
		DraftID:     draft.ID,
		DraftSource: draft.Source,
		DraftStatus: draft.Status,
		DraftNotes:  draft.Notes,
		RequestName: draft.RequestName,
	}
	mergeGlobalDataIntoForm(&form, draft.GlobalDataJSON)
	return form
}

func parseBuildFieldValues(r *http.Request) map[string]string {
	fieldValues := map[string]string{}
	count, _ := strconv.Atoi(strings.TrimSpace(r.FormValue("field_count")))
	for i := 0; i < count; i++ {
		path := strings.TrimSpace(r.FormValue(fmt.Sprintf("field_path_%d", i)))
		value := strings.TrimSpace(r.FormValue(fmt.Sprintf("field_value_%d", i)))
		if path != "" {
			fieldValues[path] = value
		}
	}
	return fieldValues
}

func extractGlobalDataFromFinalPayload(raw []byte) ([]byte, error) {
	if len(raw) == 0 {
		return nil, nil
	}
	var payload struct {
		GlobalData map[string]any `json:"globalData"`
	}
	if err := json.Unmarshal(raw, &payload); err != nil {
		return nil, err
	}
	if len(payload.GlobalData) == 0 {
		return nil, nil
	}
	data, err := json.Marshal(payload.GlobalData)
	if err != nil {
		return nil, err
	}
	return data, nil
}

func parseFieldValuesJSON(raw []byte) map[string]string {
	out := map[string]string{}
	if len(raw) == 0 {
		return out
	}
	_ = json.Unmarshal(raw, &out)
	return out
}

func mergeGlobalDataIntoForm(form *buildFormInput, raw []byte) {
	if form == nil || len(raw) == 0 {
		return
	}
	var global map[string]any
	if err := json.Unmarshal(raw, &global); err != nil {
		return
	}
	form.CompanyName = getString(global["companyName"])
	form.BusinessType = getString(global["businessType"])
	form.Username = getString(global["username"])
	form.Email = getString(global["email"])
	form.Phone = getString(global["phone"])
	form.OrgNumber = getString(global["orgNumber"])
	form.StartDate = getString(global["startDate"])
	form.Mission = getString(global["mission"])
	form.DescriptionShort = getString(global["descriptionShort"])
	form.DescriptionLong = getString(global["descriptionLong"])
	form.SiteLanguage = getString(global["siteLanguage"])
	address, _ := global["address"].(map[string]any)
	form.AddressLine1 = getString(address["line1"])
	form.AddressLine2 = getString(address["line2"])
	form.AddressCity = getString(address["city"])
	form.AddressRegion = getString(address["region"])
	form.AddressZIP = getString(address["zip"])
	form.AddressCountry = getString(address["country"])
}

func getString(v any) string {
	s, _ := v.(string)
	return strings.TrimSpace(s)
}

func defaultDraftStatus(status string) string {
	switch strings.ToLower(strings.TrimSpace(status)) {
	case "reviewed", "submitted":
		return strings.ToLower(strings.TrimSpace(status))
	default:
		return "draft"
	}
}

func websiteSectionOptions() []websiteSectionOptionView {
	values := domain.WebsiteSectionOptions()
	out := make([]websiteSectionOptionView, 0, len(values))
	for _, value := range values {
		out = append(out, websiteSectionOptionView{
			Value: value,
			Label: domain.WebsiteSectionLabel(value),
		})
	}
	return out
}