package app

import (
	"context"
	"errors"
	"fmt"
	"net/http"
	"time"

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

	"qctextbuilder/internal/buildsvc"
	"qctextbuilder/internal/config"
	"qctextbuilder/internal/httpserver"
	"qctextbuilder/internal/httpserver/handlers"
	"qctextbuilder/internal/httpserver/views"
	"qctextbuilder/internal/logging"
	"qctextbuilder/internal/mapping"
	"qctextbuilder/internal/onboarding"
	"qctextbuilder/internal/polling"
	"qctextbuilder/internal/qcclient"
	"qctextbuilder/internal/store/memory"
	"qctextbuilder/internal/templatesvc"
)

type App struct {
	server     *httpserver.Server
	pollingSvc *polling.Service
}

func New(cfg config.Config) (*App, error) {
	logger := logging.New()
	memStore := memory.New()

	qc := qcclient.New(cfg.QCBaseURL, cfg.QCToken, 15*time.Second, logger)
	templateSvc := templatesvc.New(qc, memStore, memStore)
	onboardSvc := onboarding.New(qc, memStore, memStore)
	mappingSvc := mapping.New()
	buildSvc := buildsvc.New(qc, memStore, memStore, memStore, mappingSvc, time.Duration(cfg.PollTimeoutSeconds)*time.Second)
	pollingSvc := polling.New(buildSvc, memStore, time.Duration(cfg.PollIntervalSeconds)*time.Second, cfg.PollMaxConcurrent, logger)
	api := handlers.NewAPI(templateSvc, onboardSvc, buildSvc)

	renderer, err := views.NewRenderer("web/templates/*.gohtml")
	if err != nil {
		return nil, fmt.Errorf("init renderer: %w", err)
	}
	ui := handlers.NewUI(templateSvc, onboardSvc, buildSvc, cfg, renderer)

	server := httpserver.New(cfg.HTTPAddr, logger, func(r chi.Router) {
		r.Get("/", ui.Home)
		r.Get("/settings", ui.Settings)
		r.Get("/templates", ui.Templates)
		r.Post("/templates/sync", ui.SyncTemplates)
		r.Get("/templates/{id}", ui.TemplateDetail)
		r.Post("/templates/{id}/onboard", ui.OnboardTemplate)
		r.Post("/templates/{id}/fields", ui.UpdateTemplateFields)
		r.Get("/builds/new", ui.BuildNew)
		r.Post("/builds", ui.CreateBuild)
		r.Get("/builds/{id}", ui.BuildDetail)
		r.Post("/builds/{id}/poll", ui.PollBuild)
		r.Post("/builds/{id}/fetch-editor-url", ui.FetchEditorURL)

		r.Get("/healthz", api.Health)
		r.Route("/api", func(r chi.Router) {
			r.Post("/templates/sync", api.SyncTemplates)
			r.Get("/templates", api.ListTemplates)
			r.Get("/templates/{id}", api.GetTemplateDetail)
			r.Post("/templates/{id}/onboard", api.OnboardTemplate)
			r.Put("/templates/{id}/fields", api.UpdateTemplateFields)
			r.Post("/site-builds", api.StartBuild)
			r.Get("/site-builds/{id}", api.GetBuild)
			r.Post("/site-builds/{id}/poll", api.PollBuildOnce)
			r.Post("/site-builds/{id}/fetch-editor-url", api.FetchBuildEditorURL)
		})
	})

	return &App{server: server, pollingSvc: pollingSvc}, nil
}

func (a *App) Run(ctx context.Context) error {
	go func() {
		if err := a.pollingSvc.Start(ctx); err != nil {
			// polling is best-effort in milestone-2; request flow works without supervisor
		}
	}()

	errCh := make(chan error, 1)
	go func() {
		if err := a.server.Run(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			errCh <- fmt.Errorf("http run: %w", err)
		}
		close(errCh)
	}()

	select {
	case <-ctx.Done():
		shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
		defer cancel()
		return a.server.Shutdown(shutdownCtx)
	case err := <-errCh:
		return err
	}
}