package database

import (
	"database/sql"
	"fmt"
	"time"

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

// TeamOwner 账号结构
type TeamOwner struct {
	ID        int64     `json:"id"`
	Email     string    `json:"email"`
	Password  string    `json:"password,omitempty"`
	Token     string    `json:"token,omitempty"`
	AccountID string    `json:"account_id"`
	Status    string    `json:"status"`
	CreatedAt time.Time `json:"created_at"`
}

// DB 数据库管理器
type DB struct {
	db *sql.DB
}

// 全局数据库实例
var Instance *DB

// Init 初始化数据库
func Init(dbPath string) error {
	db, err := sql.Open("sqlite3", dbPath)
	if err != nil {
		return fmt.Errorf("打开数据库失败: %w", err)
	}

	Instance = &DB{db: db}

	if err := Instance.createTables(); err != nil {
		return fmt.Errorf("创建表失败: %w", err)
	}

	fmt.Printf("[数据库] SQLite 已连接: %s\n", dbPath)
	return nil
}

// createTables 创建表
func (d *DB) createTables() error {
	_, err := d.db.Exec(`
		CREATE TABLE IF NOT EXISTS team_owners (
			id INTEGER PRIMARY KEY AUTOINCREMENT,
			email TEXT NOT NULL UNIQUE,
			password TEXT,
			token TEXT,
			account_id TEXT NOT NULL,
			status TEXT DEFAULT 'valid',
			created_at DATETIME DEFAULT CURRENT_TIMESTAMP
		);
		
		CREATE INDEX IF NOT EXISTS idx_team_owners_email ON team_owners(email);
		CREATE INDEX IF NOT EXISTS idx_team_owners_status ON team_owners(status);
		CREATE INDEX IF NOT EXISTS idx_team_owners_account_id ON team_owners(account_id);

		-- 配置表 (key-value 形式)
		CREATE TABLE IF NOT EXISTS app_config (
			key TEXT PRIMARY KEY,
			value TEXT NOT NULL,
			updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
		);
	`)
	return err
}

// GetConfig 获取配置值
func (d *DB) GetConfig(key string) (string, error) {
	var value string
	err := d.db.QueryRow("SELECT value FROM app_config WHERE key = ?", key).Scan(&value)
	if err == sql.ErrNoRows {
		return "", nil
	}
	return value, err
}

// SetConfig 设置配置值
func (d *DB) SetConfig(key, value string) error {
	_, err := d.db.Exec(`
		INSERT INTO app_config (key, value, updated_at) VALUES (?, ?, CURRENT_TIMESTAMP)
		ON CONFLICT(key) DO UPDATE SET value = ?, updated_at = CURRENT_TIMESTAMP
	`, key, value, value)
	return err
}

// GetAllConfig 获取所有配置
func (d *DB) GetAllConfig() (map[string]string, error) {
	rows, err := d.db.Query("SELECT key, value FROM app_config")
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	result := make(map[string]string)
	for rows.Next() {
		var key, value string
		if err := rows.Scan(&key, &value); err != nil {
			continue
		}
		result[key] = value
	}
	return result, nil
}

// AddTeamOwner 添加 Team Owner
func (d *DB) AddTeamOwner(owner TeamOwner) (int64, error) {
	result, err := d.db.Exec(`
		INSERT OR REPLACE INTO team_owners (email, password, token, account_id, status, created_at)
		VALUES (?, ?, ?, ?, 'valid', CURRENT_TIMESTAMP)
	`, owner.Email, owner.Password, owner.Token, owner.AccountID)
	if err != nil {
		return 0, err
	}
	return result.LastInsertId()
}

// AddTeamOwners 批量添加
func (d *DB) AddTeamOwners(owners []TeamOwner) (int, error) {
	tx, err := d.db.Begin()
	if err != nil {
		return 0, err
	}
	defer tx.Rollback()

	stmt, err := tx.Prepare(`
		INSERT OR REPLACE INTO team_owners (email, password, token, account_id, status, created_at)
		VALUES (?, ?, ?, ?, 'valid', CURRENT_TIMESTAMP)
	`)
	if err != nil {
		return 0, err
	}
	defer stmt.Close()

	count := 0
	for _, owner := range owners {
		_, err := stmt.Exec(owner.Email, owner.Password, owner.Token, owner.AccountID)
		if err != nil {
			fmt.Printf("[数据库] 插入失败 %s: %v\n", owner.Email, err)
			continue
		}
		count++
	}

	if err := tx.Commit(); err != nil {
		return 0, err
	}

	return count, nil
}

// GetTeamOwners 获取列表
func (d *DB) GetTeamOwners(status string, limit, offset int) ([]TeamOwner, int, error) {
	query := "SELECT id, email, password, token, account_id, status, created_at FROM team_owners WHERE 1=1"
	countQuery := "SELECT COUNT(*) FROM team_owners WHERE 1=1"
	args := []interface{}{}

	if status != "" {
		query += " AND status = ?"
		countQuery += " AND status = ?"
		args = append(args, status)
	}

	var total int
	err := d.db.QueryRow(countQuery, args...).Scan(&total)
	if err != nil {
		return nil, 0, err
	}

	query += " ORDER BY created_at DESC LIMIT ? OFFSET ?"
	args = append(args, limit, offset)

	rows, err := d.db.Query(query, args...)
	if err != nil {
		return nil, 0, err
	}
	defer rows.Close()

	var owners []TeamOwner
	for rows.Next() {
		var owner TeamOwner
		err := rows.Scan(&owner.ID, &owner.Email, &owner.Password, &owner.Token, &owner.AccountID, &owner.Status, &owner.CreatedAt)
		if err != nil {
			continue
		}
		owners = append(owners, owner)
	}

	return owners, total, nil
}

// GetPendingOwners 获取待处理
func (d *DB) GetPendingOwners() ([]TeamOwner, error) {
	rows, err := d.db.Query(`
		SELECT id, email, password, token, account_id, status, created_at 
		FROM team_owners WHERE status = 'valid'
		ORDER BY created_at ASC
	`)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var owners []TeamOwner
	for rows.Next() {
		var owner TeamOwner
		err := rows.Scan(&owner.ID, &owner.Email, &owner.Password, &owner.Token, &owner.AccountID, &owner.Status, &owner.CreatedAt)
		if err != nil {
			continue
		}
		owners = append(owners, owner)
	}
	return owners, nil
}

// UpdateOwnerStatus 更新状态
func (d *DB) UpdateOwnerStatus(id int64, status string) error {
	_, err := d.db.Exec("UPDATE team_owners SET status = ? WHERE id = ?", status, id)
	return err
}

// DeleteTeamOwner 删除
func (d *DB) DeleteTeamOwner(id int64) error {
	_, err := d.db.Exec("DELETE FROM team_owners WHERE id = ?", id)
	return err
}

// ClearTeamOwners 清空
func (d *DB) ClearTeamOwners() error {
	_, err := d.db.Exec("DELETE FROM team_owners")
	return err
}

// GetOwnerStats 获取统计
func (d *DB) GetOwnerStats() map[string]int {
	stats := map[string]int{
		"total":      0,
		"valid":      0,
		"registered": 0,
		"pooled":     0,
	}

	var count int
	if err := d.db.QueryRow("SELECT COUNT(*) FROM team_owners").Scan(&count); err == nil {
		stats["total"] = count
	}
	if err := d.db.QueryRow("SELECT COUNT(*) FROM team_owners WHERE status = 'valid'").Scan(&count); err == nil {
		stats["valid"] = count
	}
	if err := d.db.QueryRow("SELECT COUNT(*) FROM team_owners WHERE status = 'registered'").Scan(&count); err == nil {
		stats["registered"] = count
	}
	if err := d.db.QueryRow("SELECT COUNT(*) FROM team_owners WHERE status = 'pooled'").Scan(&count); err == nil {
		stats["pooled"] = count
	}

	return stats
}

// Close 关闭数据库
func (d *DB) Close() error {
	if d.db != nil {
		return d.db.Close()
	}
	return nil
}