package data

import (
	"context"
	"database/sql"
	"time"

	"eino-project/internal/conf"
	contextpkg "eino-project/internal/domain/context"
	"eino-project/internal/domain/monitor"
	"eino-project/internal/domain/vector"

	"github.com/go-kratos/kratos/v2/log"
	"github.com/redis/go-redis/v9"

	"github.com/google/wire"
	_ "github.com/mattn/go-sqlite3"
)

// ProviderSet is data providers.
var ProviderSet = wire.NewSet(NewData)

// Data 数据层结构
type Data struct {
	DB                *sql.DB
	RDB               *redis.Client
	VectorService     vector.VectorService
	DocProcessor      vector.DocumentProcessor
	KnowledgeSearcher vector.KnowledgeSearcher
	log               *log.Helper
	ContextManager    contextpkg.ContextManager
	Monitor           monitor.Monitor
}

// NewData 创建数据层
func NewData(c *conf.Data, logger log.Logger, vs vector.VectorService, dp vector.DocumentProcessor, ks vector.KnowledgeSearcher, contextManager contextpkg.ContextManager, monitor monitor.Monitor) (*Data, func(), error) {
	helper := log.NewHelper(logger)

	// 初始化 SQLite 数据库
	db, err := sql.Open(c.Database.Driver, c.Database.Source)
	if err != nil {
		return nil, nil, err
	}

	// 初始化 Redis 客户端
	rdb := redis.NewClient(&redis.Options{
		Addr:         c.Redis.Addr,
		Password:     c.Redis.Password,
		DB:           int(c.Redis.Db),
		ReadTimeout:  c.Redis.ReadTimeout.AsDuration(),
		WriteTimeout: c.Redis.WriteTimeout.AsDuration(),
		DialTimeout:  c.Redis.DialTimeout.AsDuration(),
		PoolSize:     int(c.Redis.PoolSize),
	})

	// 测试 Redis 连接
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	if err := rdb.Ping(ctx).Err(); err != nil {
		helper.Warnf("Redis connection failed: %v", err)
	}

	// 初始化数据库表
	if err := initTables(db); err != nil {
		return nil, nil, err
	}

	d := &Data{
		DB:                db,
		RDB:               rdb,
		VectorService:     vs,
		DocProcessor:      dp,
		KnowledgeSearcher: ks,
		log:               helper,
		ContextManager:    contextManager,
		Monitor:           monitor,
	}

	cleanup := func() {
		helper.Info("Closing data resources")
		if err := db.Close(); err != nil {
			helper.Errorf("Failed to close database: %v", err)
		}
		if err := rdb.Close(); err != nil {
			helper.Errorf("Failed to close redis: %v", err)
		}
	}

	return d, cleanup, nil
}

// initTables 初始化数据库表
func initTables(db *sql.DB) error {
	// 创建会话表
	createSessionsTable := `
	CREATE TABLE IF NOT EXISTS sessions (
		id TEXT PRIMARY KEY,
		title TEXT NOT NULL,
		created_at DATETIME DEFAULT CURRENT_TIMESTAMP
	);`

	if _, err := db.Exec(createSessionsTable); err != nil {
		return err
	}

	// 创建消息表
	createMessagesTable := `
	CREATE TABLE IF NOT EXISTS messages (
		id INTEGER PRIMARY KEY AUTOINCREMENT,
		session_id TEXT NOT NULL,
		message TEXT NOT NULL,
		timestamp DATETIME DEFAULT CURRENT_TIMESTAMP,
		type TEXT DEFAULT 'user',
		FOREIGN KEY (session_id) REFERENCES sessions(id)
	);`

	if _, err := db.Exec(createMessagesTable); err != nil {
		return err
	}

	// 创建知识库文档表
	createKnowledgeTable := `
	CREATE TABLE IF NOT EXISTS knowledge_documents (
		id TEXT PRIMARY KEY,
		file_name TEXT NOT NULL,
		file_type TEXT NOT NULL,
		content_preview TEXT,
		upload_time DATETIME DEFAULT CURRENT_TIMESTAMP,
		status TEXT DEFAULT 'active'
	);`

	if _, err := db.Exec(createKnowledgeTable); err != nil {
		return err
	}

	// 创建订单表
	createOrdersTable := `
	CREATE TABLE IF NOT EXISTS orders (
		order_id TEXT PRIMARY KEY,
		status TEXT NOT NULL,
		product TEXT NOT NULL,
		amount REAL NOT NULL,
		create_time DATETIME DEFAULT CURRENT_TIMESTAMP,
		need_ai BOOLEAN DEFAULT FALSE
	);`

	if _, err := db.Exec(createOrdersTable); err != nil {
		return err
	}

	// 插入一些模拟订单数据
	insertMockOrders(db)

	return nil
}

// insertMockOrders 插入模拟订单数据
func insertMockOrders(db *sql.DB) {
	orders := []struct {
		orderID string
		status  string
		product string
		amount  float64
		needAI  bool
	}{
		{"ORD001", "已发货", "智能手机", 2999.00, false},
		{"ORD002", "处理中", "笔记本电脑", 5999.00, true},
		{"ORD003", "已完成", "无线耳机", 299.00, false},
		{"ORD004", "退款中", "平板电脑", 1999.00, true},
		{"ORD005", "已取消", "智能手表", 1299.00, false},
	}

	for _, order := range orders {
		_, err := db.Exec(`
			INSERT OR IGNORE INTO orders (order_id, status, product, amount, need_ai) 
			VALUES (?, ?, ?, ?, ?)`,
			order.orderID, order.status, order.product, order.amount, order.needAI)
		if err != nil {
			// 忽略插入错误，可能是重复数据
			continue
		}
	}
}