package config

import (
	"fmt"
	"os"

	"gopkg.in/yaml.v3"
)

// Config 全局配置根结构
type Config struct {
	Server    ServerConfig    `yaml:"server"`
	Database  DatabaseConfig  `yaml:"database"`
	JWT       JWTConfig       `yaml:"jwt"`
	Upload    UploadConfig    `yaml:"upload"`
	Storage   StorageConfig   `yaml:"storage"`
	SMS       SMSConfig       `yaml:"sms"`
	Wechat    WechatConfig    `yaml:"wechat"`
	AI        AIConfig        `yaml:"ai"`
	CORS      CORSConfig      `yaml:"cors"`
	RateLimit RateLimitConfig `yaml:"rate_limit"`
	Env       EnvConfig       `yaml:"env"`
}

// ServerConfig 服务配置
type ServerConfig struct {
	Port             int `yaml:"port"`
	ReadTimeout      int `yaml:"read_timeout"`       // 读超时（秒）
	WriteTimeout     int `yaml:"write_timeout"`      // 写超时（秒）
	IdleTimeout      int `yaml:"idle_timeout"`       // 空闲超时（秒）
	ShutdownTimeout  int `yaml:"shutdown_timeout"`   // 优雅关机等待（秒）
}

// DatabaseConfig 数据库配置
type DatabaseConfig struct {
	Driver      string       `yaml:"driver"` // sqlite | mysql
	AutoMigrate bool         `yaml:"auto_migrate"`
	InitData    bool         `yaml:"init_data"`
	SQLite      SQLiteConfig `yaml:"sqlite"`
	MySQL       MySQLConfig  `yaml:"mysql"`
	DSN         string       `yaml:"-"`
}

// SQLiteConfig SQLite 配置
type SQLiteConfig struct {
	Path string `yaml:"path"`
}

// MySQLConfig MySQL 配置
type MySQLConfig struct {
	Host         string `yaml:"host"`
	Port         int    `yaml:"port"`
	Username     string `yaml:"username"`
	Password     string `yaml:"password"`
	Database     string `yaml:"database"`
	Charset      string `yaml:"charset"`
	MaxIdleConns int    `yaml:"max_idle_conns"`
	MaxOpenConns int    `yaml:"max_open_conns"`
}

// BuildDSN 根据驱动构建数据源名
func (c *DatabaseConfig) BuildDSN() {
	switch c.Driver {
	case "mysql":
		c.DSN = fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=%s&parseTime=True&loc=Local",
			c.MySQL.Username, c.MySQL.Password, c.MySQL.Host, c.MySQL.Port, c.MySQL.Database, c.MySQL.Charset)
	default:
		c.DSN = c.SQLite.Path
	}
}

// JWTConfig JWT 认证配置
type JWTConfig struct {
	Secret      string `yaml:"secret"`
	ExpireHours int    `yaml:"expire_hours"`
}

// UploadConfig 文件上传配置
type UploadConfig struct {
	Path         string   `yaml:"path"`
	BaseURL      string   `yaml:"base_url"`
	MaxSize      int64    `yaml:"max_size"`
	AllowedTypes []string `yaml:"allowed_types"`
}

// StorageConfig 存储配置
type StorageConfig struct {
	Type  string       `yaml:"type"` // local | minio | cos
	Local LocalStorage `yaml:"local"`
	MinIO MinIOConfig  `yaml:"minio"`
	COS   COSConfig    `yaml:"cos"`
}

// LocalStorage 本地存储配置
type LocalStorage struct {
	Path string `yaml:"path"`
}

// MinIOConfig MinIO 配置
type MinIOConfig struct {
	Endpoint         string `yaml:"endpoint"`
	AccessKey        string `yaml:"access_key"`
	SecretKey        string `yaml:"secret_key"`
	Bucket           string `yaml:"bucket"`
	UseSSL           bool   `yaml:"use_ssl"`
	PublicURL        string `yaml:"public_url"`
	AutoCreateBucket bool   `yaml:"auto_create_bucket"`
}

// COSConfig 腾讯云 COS 配置
type COSConfig struct {
	SecretID  string `yaml:"secret_id"`
	SecretKey string `yaml:"secret_key"`
	Bucket    string `yaml:"bucket"`
	Region    string `yaml:"region"`
	BaseURL   string `yaml:"base_url"`
}

// SMSConfig 短信服务配置
type SMSConfig struct {
	DevMode      bool       `yaml:"dev_mode"`
	Provider     string     `yaml:"provider"` // mock | aliyun | tencent
	CodeExpire   int        `yaml:"code_expire"`
	SendInterval int        `yaml:"send_interval"`
	Aliyun       AliyunSMS  `yaml:"aliyun"`
	Tencent      TencentSMS `yaml:"tencent"`
}

// AliyunSMS 阿里云短信配置
type AliyunSMS struct {
	AccessKeyID     string `yaml:"access_key_id"`
	AccessKeySecret string `yaml:"access_key_secret"`
	SignName        string `yaml:"sign_name"`
	TemplateCode    string `yaml:"template_code"`
}

// TencentSMS 腾讯云短信配置
type TencentSMS struct {
	SecretID   string `yaml:"secret_id"`
	SecretKey  string `yaml:"secret_key"`
	SignName   string `yaml:"sign_name"`
	TemplateID string `yaml:"template_id"`
	AppID      string `yaml:"app_id"`
}

// WechatConfig 微信配置
type WechatConfig struct {
	AppID     string `yaml:"app_id"`
	AppSecret string `yaml:"app_secret"`
	MchID     string `yaml:"mch_id"`
	APIKey    string `yaml:"api_key"`
	NotifyURL string `yaml:"notify_url"`
}

// AIConfig AI 配置
type AIConfig struct {
	APIKey  string `yaml:"api_key"`
	APIType string `yaml:"api_type"` // deepseek | openai
	Model   string `yaml:"model"`
}

// CORSConfig CORS 跨域配置
type CORSConfig struct {
	AllowedOrigins []string `yaml:"allowed_origins"`
}

// RateLimitConfig API 限流配置
type RateLimitConfig struct {
	Enabled           bool `yaml:"enabled"`
	RequestsPerSecond int  `yaml:"requests_per_second"`
	BurstSize         int  `yaml:"burst_size"`
}

// EnvConfig 环境配置
type EnvConfig struct {
	Name string `yaml:"name"` // dev | prod
}

// AppConfig 全局配置实例
var AppConfig *Config

// Load 从指定路径加载配置文件
func Load(path string) (*Config, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		return nil, fmt.Errorf("读取配置文件失败: %w", err)
	}

	var cfg Config
	if err := yaml.Unmarshal(data, &cfg); err != nil {
		return nil, fmt.Errorf("解析配置文件失败: %w", err)
	}

	cfg.Database.BuildDSN()
	AppConfig = &cfg
	return &cfg, nil
}