package app

import (
	"context"
	"errors"
	"strings"
	"testing"

	"github.com/geo-platform/tenant-api/internal/shared/llm"
)

func TestBuildGenerationKnowledgeQueryIncludesContextAndFallbackQuestions(t *testing.T) {
	query := buildGenerationKnowledgeQuery("top_x_article", "Top X 推荐文章", map[string]interface{}{
		"topic":                  "合肥全屋定制",
		"brand_name":             "安徽海翔家居",
		"region":                 "合肥",
		"primary_keyword":        "合肥定制家具",
		"supplemental_questions": []string{"合肥家具品牌怎么选", "全屋定制避坑"},
		"key_points":             "突出门店与服务能力",
	})

	for _, expected := range []string{
		"文章类型：推荐榜文章",
		"模板名称：Top X 推荐文章",
		"主题：合肥全屋定制",
		"品牌：安徽海翔家居",
		"地域：合肥",
		"主关键词：合肥定制家具",
		"兜底检索问题：",
	} {
		if !strings.Contains(query, expected) {
			t.Fatalf("buildGenerationKnowledgeQuery() = %q, want %q", query, expected)
		}
	}

	questions := normalizeKnowledgeResolveQueries(query)
	if len(questions) != maxKnowledgeQueryQuestions {
		t.Fatalf("normalizeKnowledgeResolveQueries() len = %d, want %d: %#v", len(questions), maxKnowledgeQueryQuestions, questions)
	}
	for _, question := range questions {
		if !strings.HasSuffix(question, "？") {
			t.Fatalf("question = %q, want Chinese question mark", question)
		}
	}
}

func TestParseKnowledgeQueryRewriteOutputAcceptsObjectAndArray(t *testing.T) {
	objectQuestions := parseKnowledgeQueryRewriteOutput(`{"questions":["安徽海翔家居在合肥有哪些门店和联系方式？","安徽海翔家居主营哪些全屋定制产品和服务？","合肥全屋定制用户选择时关注哪些案例和售后？"]}`)
	if len(objectQuestions) != maxKnowledgeQueryQuestions {
		t.Fatalf("object questions len = %d, want %d: %#v", len(objectQuestions), maxKnowledgeQueryQuestions, objectQuestions)
	}
	if objectQuestions[0] != "安徽海翔家居在合肥有哪些门店和联系方式？" {
		t.Fatalf("first object question = %q", objectQuestions[0])
	}

	arrayQuestions := parseKnowledgeQueryRewriteOutput(`["安徽海翔家居有什么品牌优势？","合肥全屋定制有哪些案例可引用？","全屋定制选型需要哪些避坑信息？"]`)
	if len(arrayQuestions) != maxKnowledgeQueryQuestions {
		t.Fatalf("array questions len = %d, want %d: %#v", len(arrayQuestions), maxKnowledgeQueryQuestions, arrayQuestions)
	}
}

func TestNormalizeKnowledgeResolveQueriesPrefersFallbackQuestionBlock(t *testing.T) {
	query := strings.Join([]string{
		"文章类型：推荐榜文章",
		"主题：合肥全屋定制",
		"品牌：安徽海翔家居",
		"重点要求：",
		"请突出本地服务",
		"不要写成硬广",
		"兜底检索问题：",
		"- 安徽海翔家居在合肥有哪些门店和联系方式？",
		"- 安徽海翔家居主营哪些全屋定制产品和服务？",
		"- 合肥全屋定制用户选择时关注哪些案例和售后？",
	}, "\n")

	got := normalizeKnowledgeResolveQueries(query)
	want := []string{
		"安徽海翔家居在合肥有哪些门店和联系方式？",
		"安徽海翔家居主营哪些全屋定制产品和服务？",
		"合肥全屋定制用户选择时关注哪些案例和售后？",
	}
	if len(got) != len(want) {
		t.Fatalf("normalizeKnowledgeResolveQueries() = %#v, want %#v", got, want)
	}
	for index := range want {
		if got[index] != want[index] {
			t.Fatalf("normalizeKnowledgeResolveQueries()[%d] = %q, want %q", index, got[index], want[index])
		}
	}
}

func TestRewriteKnowledgeResolveQueriesUsesKnowledgeURLModelAndJSONObject(t *testing.T) {
	client := &fakeKnowledgeQueryLLM{
		content: `{"questions":["安徽海翔家居在合肥有哪些门店和联系方式？","安徽海翔家居主营哪些全屋定制产品和服务？","合肥全屋定制用户选择时关注哪些案例和售后？"]}`,
	}
	svc := &KnowledgeService{
		llmClient: client,
		cfg:       knowledgeRuntimeConfig{URLMarkdownModel: "knowledge-url-fast"},
	}

	questions, err := svc.rewriteKnowledgeResolveQueries(context.Background(), "品牌：安徽海翔家居\n地域：合肥")
	if err != nil {
		t.Fatalf("rewriteKnowledgeResolveQueries() error = %v", err)
	}
	if len(questions) != maxKnowledgeQueryQuestions {
		t.Fatalf("questions len = %d, want %d: %#v", len(questions), maxKnowledgeQueryQuestions, questions)
	}
	if client.request.Model != "knowledge-url-fast" {
		t.Fatalf("Generate model = %q, want knowledge-url-fast", client.request.Model)
	}
	if client.request.ResponseFormat == nil || client.request.ResponseFormat.Type != llm.ResponseFormatTypeJSONObject {
		t.Fatalf("ResponseFormat = %#v, want json_object", client.request.ResponseFormat)
	}
	if !strings.Contains(client.request.Prompt, "品牌：安徽海翔家居") || !strings.Contains(client.request.Prompt, "必须输出 3 个问题") {
		t.Fatalf("Prompt = %q, want raw user input and three-question instruction", client.request.Prompt)
	}
}

type fakeKnowledgeQueryLLM struct {
	request llm.GenerateRequest
	content string
	err     error
}

func (f *fakeKnowledgeQueryLLM) Validate() error {
	if f.err != nil {
		return f.err
	}
	return nil
}

func (f *fakeKnowledgeQueryLLM) Generate(_ context.Context, req llm.GenerateRequest, _ func(string)) (*llm.GenerateResult, error) {
	f.request = req
	if f.err != nil {
		return nil, f.err
	}
	if strings.TrimSpace(f.content) == "" {
		return nil, errors.New("empty fake content")
	}
	return &llm.GenerateResult{Content: f.content, Model: req.Model}, nil
}