package starnet

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

// SetTimeout 设置请求总超时时间
// timeout > 0: 使用该超时
// timeout = 0: 使用 Client 默认超时
// timeout < 0: 禁用本次请求超时（覆盖 Client.Timeout=0）
func (r *Request) SetTimeout(timeout time.Duration) *Request {
	if r.err != nil {
		return r
	}
	r.config.Network.Timeout = timeout
	return r
}

// SetDialTimeout 设置连接超时时间
func (r *Request) SetDialTimeout(timeout time.Duration) *Request {
	if r.err != nil {
		return r
	}
	r.config.Network.DialTimeout = timeout
	return r
}

// SetProxy 设置代理
func (r *Request) SetProxy(proxy string) *Request {
	if r.err != nil {
		return r
	}
	r.config.Network.Proxy = proxy
	return r
}

// SetDialFunc 设置自定义 Dial 函数
func (r *Request) SetDialFunc(fn func(ctx context.Context, network, addr string) (net.Conn, error)) *Request {
	if r.err != nil {
		return r
	}
	r.config.Network.DialFunc = fn
	return r
}

// SetTLSConfig 设置 TLS 配置
func (r *Request) SetTLSConfig(tlsConfig *tls.Config) *Request {
	if r.err != nil {
		return r
	}
	r.config.TLS.Config = tlsConfig
	return r
}

// SetSkipTLSVerify 设置是否跳过 TLS 验证
func (r *Request) SetSkipTLSVerify(skip bool) *Request {
	if r.err != nil {
		return r
	}
	r.config.TLS.SkipVerify = skip
	return r
}

// SetCustomIP 设置自定义 IP（直接指定 IP，跳过 DNS）
func (r *Request) SetCustomIP(ips []string) *Request {
	if r.err != nil {
		return r
	}

	// 验证 IP 格式
	for _, ip := range ips {
		if net.ParseIP(ip) == nil {
			r.err = wrapError(ErrInvalidIP, "ip: %s", ip)
			return r
		}
	}

	r.config.DNS.CustomIP = ips
	return r
}

// AddCustomIP 添加自定义 IP
func (r *Request) AddCustomIP(ip string) *Request {
	if r.err != nil {
		return r
	}

	if net.ParseIP(ip) == nil {
		r.err = wrapError(ErrInvalidIP, "ip: %s", ip)
		return r
	}

	r.config.DNS.CustomIP = append(r.config.DNS.CustomIP, ip)
	return r
}

// SetCustomDNS 设置自定义 DNS 服务器
func (r *Request) SetCustomDNS(dnsServers []string) *Request {
	if r.err != nil {
		return r
	}

	// 验证 DNS 服务器格式
	for _, dns := range dnsServers {
		if net.ParseIP(dns) == nil {
			r.err = wrapError(ErrInvalidDNS, "dns: %s", dns)
			return r
		}
	}

	r.config.DNS.CustomDNS = dnsServers
	return r
}

// AddCustomDNS 添加自定义 DNS 服务器
func (r *Request) AddCustomDNS(dns string) *Request {
	if r.err != nil {
		return r
	}

	if net.ParseIP(dns) == nil {
		r.err = wrapError(ErrInvalidDNS, "dns: %s", dns)
		return r
	}

	r.config.DNS.CustomDNS = append(r.config.DNS.CustomDNS, dns)
	return r
}

// SetLookupFunc 设置自定义 DNS 解析函数
func (r *Request) SetLookupFunc(fn func(ctx context.Context, host string) ([]net.IPAddr, error)) *Request {
	if r.err != nil {
		return r
	}
	r.config.DNS.LookupFunc = fn
	return r
}

// SetBasicAuth 设置 Basic 认证
func (r *Request) SetBasicAuth(username, password string) *Request {
	if r.err != nil {
		return r
	}
	r.config.BasicAuth = [2]string{username, password}
	return r
}

// SetContentLength 设置 Content-Length
func (r *Request) SetContentLength(length int64) *Request {
	if r.err != nil {
		return r
	}
	r.config.ContentLength = length
	return r
}

// SetAutoCalcContentLength 设置是否自动计算 Content-Length
// 警告：启用后会将整个 body 读入内存
func (r *Request) SetAutoCalcContentLength(auto bool) *Request {
	if r.err != nil {
		return r
	}

	if r.doRaw {
		r.err = fmt.Errorf("cannot set auto calc content length in raw mode")
		return r
	}

	r.config.AutoCalcContentLength = auto
	return r
}

// SetTransport 设置自定义 Transport
func (r *Request) SetTransport(transport *http.Transport) *Request {
	if r.err != nil {
		return r
	}
	r.config.Transport = transport
	r.config.CustomTransport = true
	return r
}

// SetUploadProgress 设置文件上传进度回调
func (r *Request) SetUploadProgress(fn UploadProgressFunc) *Request {
	if r.err != nil {
		return r
	}
	r.config.UploadProgress = fn
	return r
}

// AddQuery 添加查询参数
func (r *Request) AddQuery(key, value string) *Request {
	if r.err != nil {
		return r
	}
	r.config.Queries[key] = append(r.config.Queries[key], value)
	return r
}

// SetQuery 设置查询参数（覆盖）
func (r *Request) SetQuery(key, value string) *Request {
	if r.err != nil {
		return r
	}
	r.config.Queries[key] = []string{value}
	return r
}

// SetQueries 设置所有查询参数（覆盖）
func (r *Request) SetQueries(queries map[string][]string) *Request {
	if r.err != nil {
		return r
	}
	r.config.Queries = queries
	return r
}

// AddQueries 批量添加查询参数
func (r *Request) AddQueries(queries map[string]string) *Request {
	if r.err != nil {
		return r
	}
	for k, v := range queries {
		r.config.Queries[k] = append(r.config.Queries[k], v)
	}
	return r
}

// DeleteQuery 删除查询参数
func (r *Request) DeleteQuery(key string) *Request {
	if r.err != nil {
		return r
	}
	delete(r.config.Queries, key)
	return r
}

// DeleteQueryValue 删除查询参数的特定值
func (r *Request) DeleteQueryValue(key, value string) *Request {
	if r.err != nil {
		return r
	}

	values, ok := r.config.Queries[key]
	if !ok {
		return r
	}

	newValues := make([]string, 0, len(values))
	for _, v := range values {
		if v != value {
			newValues = append(newValues, v)
		}
	}

	if len(newValues) == 0 {
		delete(r.config.Queries, key)
	} else {
		r.config.Queries[key] = newValues
	}

	return r
}