package starnet

import (
	"context"
	"crypto/tls"
	"io"
	"net"
	"net/http"
	"time"
)

// HTTP Content-Type 常量
const (
	ContentTypeFormURLEncoded = "application/x-www-form-urlencoded"
	ContentTypeFormData       = "multipart/form-data"
	ContentTypeJSON           = "application/json"
	ContentTypeXML            = "application/xml"
	ContentTypePlain          = "text/plain"
	ContentTypeHTML           = "text/html"
	ContentTypeOctetStream    = "application/octet-stream"
)

// 默认配置
const (
	DefaultDialTimeout   = 5 * time.Second
	DefaultTimeout       = 10 * time.Second
	DefaultUserAgent     = "Starnet/1.0.0"
	DefaultFetchRespBody = false
)

// RequestFile 表示要上传的文件
type RequestFile struct {
	FormName string    // 表单字段名
	FileName string    // 文件名
	FilePath string    // 文件路径（如果从文件读取）
	FileData io.Reader // 文件数据流
	FileSize int64     // 文件大小
	FileType string    // MIME 类型
}

// UploadProgressFunc 文件上传进度回调函数
type UploadProgressFunc func(filename string, uploaded int64, total int64)

// NetworkConfig 网络配置
type NetworkConfig struct {
	Proxy       string        // 代理地址
	DialTimeout time.Duration // 连接超时
	Timeout     time.Duration // 总超时
	DialFunc    func(ctx context.Context, network, addr string) (net.Conn, error)
}

// TLSConfig TLS 配置
type TLSConfig struct {
	Config     *tls.Config // TLS 配置
	SkipVerify bool        // 跳过证书验证
}

// DNSConfig DNS 配置
type DNSConfig struct {
	CustomIP   []string                                                     // 直接指定 IP（最高优先级）
	CustomDNS  []string                                                     // 自定义 DNS 服务器
	LookupFunc func(ctx context.Context, host string) ([]net.IPAddr, error) // 自定义解析函数
}

// BodyConfig 请求体配置
type BodyConfig struct {
	Bytes    []byte              // 原始字节
	Reader   io.Reader           // 数据流
	FormData map[string][]string // 表单数据
	Files    []RequestFile       // 文件列表
}

// RequestConfig 请求配置（内部使用）
type RequestConfig struct {
	Network NetworkConfig
	TLS     TLSConfig
	DNS     DNSConfig
	Body    BodyConfig
	Headers http.Header
	Cookies []*http.Cookie
	Queries map[string][]string

	// 其他配置
	BasicAuth             [2]string          // Basic 认证
	ContentLength         int64              // 手动设置的 Content-Length
	AutoCalcContentLength bool               // 自动计算 Content-Length
	UploadProgress        UploadProgressFunc // 上传进度回调

	// Transport 配置
	CustomTransport bool            // 是否使用自定义 Transport
	Transport       *http.Transport // 自定义 Transport
}

// Clone 克隆配置
func (c *RequestConfig) Clone() *RequestConfig {
	return &RequestConfig{
		Network: NetworkConfig{
			Proxy:       c.Network.Proxy,
			DialTimeout: c.Network.DialTimeout,
			Timeout:     c.Network.Timeout,
			DialFunc:    c.Network.DialFunc,
		},
		TLS: TLSConfig{
			Config:     cloneTLSConfig(c.TLS.Config),
			SkipVerify: c.TLS.SkipVerify,
		},
		DNS: DNSConfig{
			CustomIP:   cloneStringSlice(c.DNS.CustomIP),
			CustomDNS:  cloneStringSlice(c.DNS.CustomDNS),
			LookupFunc: c.DNS.LookupFunc,
		},
		Body: BodyConfig{
			Bytes:    cloneBytes(c.Body.Bytes),
			Reader:   c.Body.Reader, // Reader 不可克隆
			FormData: cloneStringMapSlice(c.Body.FormData),
			Files:    cloneFiles(c.Body.Files),
		},
		Headers:               cloneHeader(c.Headers),
		Cookies:               cloneCookies(c.Cookies),
		Queries:               cloneStringMapSlice(c.Queries),
		BasicAuth:             c.BasicAuth,
		ContentLength:         c.ContentLength,
		AutoCalcContentLength: c.AutoCalcContentLength,
		UploadProgress:        c.UploadProgress,
		CustomTransport:       c.CustomTransport,
		Transport:             c.Transport, // Transport 共享
	}
}

// RequestOpt 请求选项函数
type RequestOpt func(*Request) error