package mapping

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"qctextbuilder/internal/domain"
	"qctextbuilder/internal/llmruntime"
)

type stubSettingsReader struct {
	settings *domain.AppSettings
	err      error
}

func (s *stubSettingsReader) GetSettings(context.Context) (*domain.AppSettings, error) {
	if s.err != nil {
		return nil, s.err
	}
	return s.settings, nil
}

func TestProviderAwareSuggestionGenerator_UsesActiveProviderModelAndKey(t *testing.T) {
	t.Parallel()

	var (
		gotPath        string
		gotAuth        string
		gotModel       string
		gotTemperature float64
		gotMaxTokens   float64
	)
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		gotPath = r.URL.Path
		gotAuth = r.Header.Get("Authorization")
		var payload map[string]any
		_ = json.NewDecoder(r.Body).Decode(&payload)
		gotModel, _ = payload["model"].(string)
		gotTemperature, _ = payload["temperature"].(float64)
		gotMaxTokens, _ = payload["max_tokens"].(float64)
		_, _ = w.Write([]byte(`{"choices":[{"message":{"content":"{\"suggestions\":[{\"fieldPath\":\"text.textTitle_m1710_1\",\"value\":\"Provider Hero\",\"reason\":\"focused hero\"}]}"}}]}`))
	}))
	defer server.Close()

	generator := NewProviderAwareSuggestionGenerator(&stubSettingsReader{settings: &domain.AppSettings{
		LLMActiveProvider:     domain.LLMProviderOpenAI,
		LLMActiveModel:        "gpt-5.4",
		LLMBaseURL:            server.URL,
		LLMTemperature:        0.65,
		LLMMaxTokens:          333,
		OpenAIAPIKeyEncrypted: "openai-key",
	}}, llmruntime.NewFactory(5*time.Second))

	result, err := generator.Generate(context.Background(), SuggestionRequest{
		Fields: []domain.TemplateField{
			{Path: "text.textTitle_m1710_1", KeyName: "textTitle_m1710_1", FieldKind: "text", IsEnabled: true, WebsiteSection: domain.WebsiteSectionHero},
		},
		GlobalData: map[string]any{"companyName": "Muster AG"},
		Existing:   map[string]string{},
	})
	if err != nil {
		t.Fatalf("generate failed: %v", err)
	}
	if got := result.ByFieldPath["text.textTitle_m1710_1"].Value; got != "Provider Hero" {
		t.Fatalf("unexpected value: %q", got)
	}
	if got := result.ByFieldPath["text.textTitle_m1710_1"].Source; got != domain.LLMProviderOpenAI {
		t.Fatalf("unexpected source: %q", got)
	}
	if gotPath != "/v1/chat/completions" {
		t.Fatalf("unexpected path: %s", gotPath)
	}
	if gotAuth != "Bearer openai-key" {
		t.Fatalf("unexpected auth header: %q", gotAuth)
	}
	if gotModel != "gpt-5.4" {
		t.Fatalf("unexpected model: %q", gotModel)
	}
	if gotTemperature != 0.65 {
		t.Fatalf("unexpected temperature: %v", gotTemperature)
	}
	if gotMaxTokens != 333 {
		t.Fatalf("unexpected max_tokens: %v", gotMaxTokens)
	}
}

func TestProviderAwareSuggestionGenerator_RequiresAPIKeyForNonOllama(t *testing.T) {
	t.Parallel()

	generator := NewProviderAwareSuggestionGenerator(&stubSettingsReader{settings: &domain.AppSettings{
		LLMActiveProvider: domain.LLMProviderAnthropic,
		LLMActiveModel:    "claude-sonnet-4-5",
	}}, llmruntime.NewFactory(5*time.Second))

	_, err := generator.Generate(context.Background(), SuggestionRequest{
		Fields: []domain.TemplateField{{Path: "text.textTitle_m1710_1", KeyName: "textTitle_m1710_1", FieldKind: "text", IsEnabled: true, WebsiteSection: domain.WebsiteSectionHero}},
	})
	if err == nil || !strings.Contains(err.Error(), "api key") {
		t.Fatalf("expected api key error, got: %v", err)
	}
}

func TestParseProviderSuggestions_AcceptsFencedJSON(t *testing.T) {
	t.Parallel()

	items, err := parseProviderSuggestions("```json\n{\"suggestions\":[{\"fieldPath\":\"a\",\"value\":\"b\"}]}\n```")
	if err != nil {
		t.Fatalf("parse failed: %v", err)
	}
	if len(items) != 1 || items[0].FieldPath != "a" || items[0].Value != "b" {
		t.Fatalf("unexpected parsed result: %+v", items)
	}
}

func TestParseProviderSuggestions_RejectsEmptyValue(t *testing.T) {
	t.Parallel()

	_, err := parseProviderSuggestions(`{"suggestions":[{"fieldPath":"a","value":""}]}`)
	if err == nil || !strings.Contains(err.Error(), "empty value") {
		t.Fatalf("expected empty value error, got: %v", err)
	}
}