package config

import (
	"fmt"
	"path/filepath"
	"strings"

	"github.com/joho/godotenv"
	"github.com/spf13/viper"
)

type AppConfig struct {
	Name string `mapstructure:"name"`
	Env  string `mapstructure:"env"`
	Port int    `mapstructure:"port"`
}

type SQLiteConfig struct {
	Path string `mapstructure:"path"`
}

type MySQLConfig struct {
	Host     string `mapstructure:"host"`
	Port     int    `mapstructure:"port"`
	User     string `mapstructure:"user"`
	Password string `mapstructure:"password"`
	DBName   string `mapstructure:"dbname"`
	Params   string `mapstructure:"params"`
}

type PostgresConfig struct {
	Host     string `mapstructure:"host"`
	Port     int    `mapstructure:"port"`
	User     string `mapstructure:"user"`
	Password string `mapstructure:"password"`
	DBName   string `mapstructure:"dbname"`
	SSLMode  string `mapstructure:"sslmode"`
}

type DatabaseConfig struct {
	Driver   string         `mapstructure:"driver"`
	SQLite   SQLiteConfig   `mapstructure:"sqlite"`
	MySQL    MySQLConfig    `mapstructure:"mysql"`
	Postgres PostgresConfig `mapstructure:"postgres"`
}

type Config struct {
	App      AppConfig      `mapstructure:"app"`
	Database DatabaseConfig `mapstructure:"database"`
}

func LoadConfig(configPath string) (*Config, error) {
	v := viper.New()

	envPath := filepath.Join(configPath, ".env")
	_ = godotenv.Load(envPath) // ignore missing .env

	v.AddConfigPath(configPath)
	v.SetConfigName("config")
	v.SetConfigType("yaml")

	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
	v.AutomaticEnv()

	if err := v.ReadInConfig(); err != nil {
		return nil, fmt.Errorf("读取配置失败: %w", err)
	}

	cfg := new(Config)
	if err := v.Unmarshal(cfg); err != nil {
		return nil, fmt.Errorf("解析配置失败: %w", err)
	}

	if strings.TrimSpace(cfg.Database.Driver) == "" {
		cfg.Database.Driver = "sqlite"
	}

	return cfg, nil
}