package main

import (
	"context"
	"database/sql"
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"time"

	_ "github.com/go-sql-driver/mysql"
	"github.com/joho/godotenv"
)

// DatabaseConfig 数据库配置
type DatabaseConfig struct {
	Type     string
	Host     string
	Port     string
	Username string
	Password string
	Name     string
}

// BidItem 投标项目结构体
type BidItem struct {
	ID          string `json:"id"`
	Title       string `json:"title"`
	URL         string `json:"url"`
	PublishDate string `json:"publishDate"`
	Source      string `json:"source"`
	Pin         bool   `json:"pin"`
	CreatedAt   string `json:"createdAt"`
	UpdatedAt   string `json:"updatedAt"`
}

// App struct
type App struct {
	ctx            context.Context
	dbConfig       *DatabaseConfig
	projectRootDir string
}

// NewApp creates a new App application struct
func NewApp() *App {
	return &App{}
}

// startup is called when the app starts. The context is saved
// so we can call the runtime methods
func (a *App) startup(ctx context.Context) {
	a.ctx = ctx
	a.loadEnv()
}

// loadEnv 加载 .env 文件
func (a *App) loadEnv() {
	// 获取项目根目录（从当前工作目录向上查找 .env 文件）
	wd, err := os.Getwd()
	if err != nil {
		fmt.Printf("获取工作目录失败: %v\n", err)
		return
	}

	// 查找 .env 文件
	envPath := a.findEnvFile(wd)
	if envPath == "" {
		fmt.Println("未找到 .env 文件")
		return
	}

	// 加载 .env 文件
	if err := godotenv.Load(envPath); err != nil {
		fmt.Printf("加载 .env 文件失败: %v\n", err)
		return
	}

	// 保存项目根目录
	a.projectRootDir = filepath.Dir(envPath)

	// 读取数据库配置
	a.dbConfig = &DatabaseConfig{
		Type:     os.Getenv("DATABASE_TYPE"),
		Host:     os.Getenv("DATABASE_HOST"),
		Port:     os.Getenv("DATABASE_PORT"),
		Username: os.Getenv("DATABASE_USERNAME"),
		Password: os.Getenv("DATABASE_PASSWORD"),
		Name:     os.Getenv("DATABASE_NAME"),
	}

	fmt.Printf("数据库配置已加载: %s@%s:%s/%s\n", a.dbConfig.Username, a.dbConfig.Host, a.dbConfig.Port, a.dbConfig.Name)
}

// findEnvFile 查找 .env 文件
func (a *App) findEnvFile(startDir string) string {
	dir := startDir
	for {
		envPath := filepath.Join(dir, ".env")
		if _, err := os.Stat(envPath); err == nil {
			return envPath
		}

		// 检查是否到达根目录
		parent := filepath.Dir(dir)
		if parent == dir {
			break
		}
		dir = parent
	}
	return ""
}

// GetDatabaseConfig 获取数据库配置
func (a *App) GetDatabaseConfig() *DatabaseConfig {
	return a.dbConfig
}

// GetDatabaseDSN 获取数据库连接字符串
func (a *App) GetDatabaseDSN() string {
	if a.dbConfig == nil {
		return ""
	}

	// 根据数据库类型生成 DSN
	switch strings.ToLower(a.dbConfig.Type) {
	case "mariadb", "mysql":
		return fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local",
			a.dbConfig.Username,
			a.dbConfig.Password,
			a.dbConfig.Host,
			a.dbConfig.Port,
			a.dbConfig.Name,
		)
	case "postgres", "postgresql":
		return fmt.Sprintf("host=%s port=%s user=%s password=%s dbname=%s sslmode=disable",
			a.dbConfig.Host,
			a.dbConfig.Port,
			a.dbConfig.Username,
			a.dbConfig.Password,
			a.dbConfig.Name,
		)
	default:
		return ""
	}
}

// Greet returns a greeting for the given name
func (a *App) Greet(name string) string {
	return fmt.Sprintf("Hello %s, It's show time!", name)
}

// GetPinnedBidItems 获取 pin=true 的投标项目
func (a *App) GetPinnedBidItems() ([]BidItem, error) {
	dsn := a.GetDatabaseDSN()
	if dsn == "" {
		return nil, fmt.Errorf("数据库配置未加载")
	}

	db, err := sql.Open("mysql", dsn)
	if err != nil {
		return nil, fmt.Errorf("连接数据库失败: %v", err)
	}
	defer db.Close()

	// 测试连接
	if err := db.Ping(); err != nil {
		return nil, fmt.Errorf("数据库连接测试失败: %v", err)
	}

	// 查询 pin=true 的记录
	query := `SELECT id, title, url, publishDate, source, pin, createdAt, updatedAt
	          FROM bid_items
	          WHERE pin = true
	          ORDER BY createdAt DESC`

	rows, err := db.Query(query)
	if err != nil {
		return nil, fmt.Errorf("查询失败: %v", err)
	}
	defer rows.Close()

	var items []BidItem
	for rows.Next() {
		var item BidItem
		var publishDate, createdAt, updatedAt time.Time

		err := rows.Scan(
			&item.ID,
			&item.Title,
			&item.URL,
			&publishDate,
			&item.Source,
			&item.Pin,
			&createdAt,
			&updatedAt,
		)
		if err != nil {
			return nil, fmt.Errorf("扫描行失败: %v", err)
		}

		item.PublishDate = publishDate.Format("2006-01-02 15:04:05")
		item.CreatedAt = createdAt.Format("2006-01-02 15:04:05")
		item.UpdatedAt = updatedAt.Format("2006-01-02 15:04:05")

		items = append(items, item)
	}

	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("遍历行失败: %v", err)
	}

	return items, nil
}