package search

import (
	"fmt"
	"strings"
	"testing"
	"time"

	"github.com/glebarez/sqlite"
	"github.com/stretchr/testify/require"
	"gorm.io/gorm"
	"senlinai-agent/backend/internal/models"
)

func TestSearchFindsDocumentBody(t *testing.T) {
	database, err := gorm.Open(sqlite.Open(fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())), &gorm.Config{})
	require.NoError(t, err)
	require.NoError(t, models.AutoMigrate(database))
	models.DBService = database
	require.NoError(t, database.Create(&models.SaProject{ID: 1, OwnerID: 7, Name: "支付项目"}).Error)
	createSearchDocument(t, database, 1, 7, "接口方案.md", "二维码支付回调设计", "", time.Time{})

	service := NewService()
	results, err := service.Search(7, "回调")

	require.NoError(t, err)
	require.Len(t, results, 1)
	require.Equal(t, "document", results[0].Type)
}

func TestSearchAppliesStableFairGlobalLimitAcrossResultTypes(t *testing.T) {
	database, err := gorm.Open(sqlite.Open(fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())), &gorm.Config{})
	require.NoError(t, err)
	require.NoError(t, models.AutoMigrate(database))
	models.DBService = database

	baseTime := time.Date(2026, time.July, 21, 12, 0, 0, 0, time.UTC)
	for index := 0; index < 60; index++ {
		project := models.SaProject{
			Identity:   fmt.Sprintf("00000000-0000-7001-8000-%012d", index),
			OwnerID:    7,
			Name:       fmt.Sprintf("稳定排序项目 %02d", index),
			Identifier: fmt.Sprintf("SORT-%02d", index),
			UpdatedAt:  baseTime.Add(time.Duration(index) * time.Minute),
		}
		require.NoError(t, database.Create(&project).Error)
		require.NoError(t, database.Create(&models.SaTask{
			Identity:  fmt.Sprintf("00000000-0000-7002-8000-%012d", index),
			ProjectID: project.ID,
			CreatedBy: 7,
			Title:     fmt.Sprintf("稳定排序任务 %02d", index),
			Status:    "open",
			UpdatedAt: baseTime.Add(time.Duration(index) * time.Minute),
		}).Error)
		document := models.SaDocument{
			Identity:       fmt.Sprintf("00000000-0000-7003-8000-%012d", index),
			ProjectID:      project.ID,
			CreatedBy:      7,
			Kind:           models.DocumentKindFile,
			Name:           fmt.Sprintf("稳定排序文档 %02d.md", index),
			NormalizedName: fmt.Sprintf("稳定排序文档 %02d.md", index),
			Extension:      ".md",
			Revision:       1,
			UpdatedAt:      baseTime.Add(time.Duration(index) * time.Minute),
		}
		require.NoError(t, database.Create(&document).Error)
	}

	service := NewService(database)
	results, err := service.Search(7, "稳定排序")
	require.NoError(t, err)
	require.Len(t, results, maxSearchResults)

	counts := map[string]int{}
	for _, result := range results {
		counts[result.Type]++
	}
	require.Equal(t, map[string]int{"project": 17, "task": 17, "document": 16}, counts)
	require.Equal(t,
		[]string{"project", "task", "document", "project", "task", "document", "project", "task", "document"},
		resultTypes(results[:9]),
	)
	require.Equal(t, "00000000-0000-7001-8000-000000000059", results[0].ID)
	require.Equal(t, "00000000-0000-7002-8000-000000000059", results[1].ID)
	require.Equal(t, "00000000-0000-7003-8000-000000000059", results[2].ID)

	again, err := service.Search(7, "稳定排序")
	require.NoError(t, err)
	require.Equal(t, results, again)
}

func TestSearchBoundsChineseSnippetsByRune(t *testing.T) {
	database, err := gorm.Open(sqlite.Open(fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())), &gorm.Config{})
	require.NoError(t, err)
	require.NoError(t, models.AutoMigrate(database))
	models.DBService = database
	project := models.SaProject{OwnerID: 7, Name: "摘要项目", Identifier: "SNIPPET"}
	require.NoError(t, database.Create(&project).Error)
	createSearchDocument(t, database, project.ID, 7, "中文摘要.md", strings.Repeat("森", 300)+"尾", "", time.Time{})

	results, err := NewService(database).Search(7, "森")
	require.NoError(t, err)
	require.Len(t, results, 1)
	require.Len(t, []rune(results[0].Snippet), 240)
	require.NotContains(t, results[0].Snippet, "尾")
}

func resultTypes(results []SearchResultDTO) []string {
	types := make([]string, 0, len(results))
	for _, result := range results {
		types = append(types, result.Type)
	}
	return types
}

func TestSearchOnlyReturnsNavigableProjectTaskAndDocumentResults(t *testing.T) {
	database, err := gorm.Open(sqlite.Open(fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())), &gorm.Config{})
	require.NoError(t, err)
	require.NoError(t, models.AutoMigrate(database))
	models.DBService = database
	require.NoError(t, database.Create(&models.SaProject{ID: 1, OwnerID: 7, Name: "webhook 支付项目"}).Error)
	require.NoError(t, database.Create(&models.SaTask{ProjectID: 1, CreatedBy: 7, Title: "回调任务", Description: "检查 webhook"}).Error)
	createSearchDocument(t, database, 1, 7, "回调文档.md", "webhook 流程", "", time.Time{})
	require.NoError(t, database.Create(&models.SaInboxItem{ProjectID: 1, CreatedBy: 7, SourceType: "text", Title: "收集项", Body: "webhook 待整理"}).Error)
	require.NoError(t, database.Create(&models.SaAISession{ProjectID: 1, CreatedBy: 7, Title: "AI 分析", Context: "webhook 问答"}).Error)

	service := NewService()
	results, err := service.Search(7, "webhook")

	require.NoError(t, err)
	types := make(map[string]bool)
	for _, result := range results {
		types[result.Type] = true
	}
	require.Equal(t, map[string]bool{"project": true, "task": true, "document": true}, types)
	require.Len(t, results, 3)
}

func createSearchDocument(t *testing.T, database *gorm.DB, projectID, userID uint, name, markdown, identity string, updatedAt time.Time) models.SaDocument {
	t.Helper()
	document := models.SaDocument{
		Identity: identity, ProjectID: projectID, CreatedBy: userID, Kind: models.DocumentKindFile,
		Name: name, NormalizedName: strings.ToLower(name), Extension: ".md",
		MimeType: "text/markdown", Size: int64(len([]byte(markdown))), Revision: 1,
		UpdatedAt: updatedAt,
	}
	require.NoError(t, database.Create(&document).Error)
	require.NoError(t, database.Create(&models.SaDocumentContent{DocumentID: document.ID, Markdown: markdown}).Error)
	return document
}

func TestSearchTreatsLikeWildcardsAsLiteralKeywords(t *testing.T) {
	database, err := gorm.Open(sqlite.Open(fmt.Sprintf("file:%s?mode=memory&cache=shared", t.Name())), &gorm.Config{})
	require.NoError(t, err)
	require.NoError(t, models.AutoMigrate(database))
	models.DBService = database
	require.NoError(t, database.Create(&models.SaProject{ID: 1, OwnerID: 7, Name: "100%_完成", Identifier: "SPECIAL"}).Error)
	require.NoError(t, database.Create(&models.SaProject{ID: 2, OwnerID: 7, Name: "普通项目", Identifier: "NORMAL"}).Error)

	percentResults, err := NewService().Search(7, "%")
	require.NoError(t, err)
	require.Len(t, percentResults, 1)
	require.Equal(t, "100%_完成", percentResults[0].Title)

	underscoreResults, err := NewService().Search(7, "_")
	require.NoError(t, err)
	require.Len(t, underscoreResults, 1)
	require.Equal(t, "100%_完成", underscoreResults[0].Title)
}