package starnet

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

// Client HTTP 客户端封装
type Client struct {
	client *http.Client
	opts   []RequestOpt
	mu     sync.RWMutex
}

// NewClient 创建新的 Client
func NewClient(opts ...RequestOpt) (*Client, error) {
	// 创建基础 Transport
	baseTransport := &http.Transport{
		ForceAttemptHTTP2:     true,
		MaxIdleConns:          100,
		MaxIdleConnsPerHost:   10,
		IdleConnTimeout:       90 * time.Second,
		TLSHandshakeTimeout:   10 * time.Second,
		ExpectContinueTimeout: 1 * time.Second,
	}

	httpClient := &http.Client{
		Transport: &Transport{base: baseTransport},
		//Timeout:   DefaultTimeout,
	}

	// 应用选项（如果有）
	if len(opts) > 0 {
		// 创建临时请求以应用选项
		req, err := newRequest(context.Background(), "", http.MethodGet, opts...)
		if err != nil {
			return nil, wrapError(err, "create client")
		}

		/*
			// 如果选项中有自定义配置，应用到 httpClient
			if req.config.Network.Timeout > 0 {
				httpClient.Timeout = req.config.Network.Timeout
			}

		*/

		// 如果有自定义 Transport
		if req.config.CustomTransport && req.config.Transport != nil {
			httpClient.Transport = &Transport{base: req.config.Transport}
		}
	}

	return &Client{
		client: httpClient,
		opts:   opts,
	}, nil
}

// NewClientNoErr 创建新的 Client（忽略错误）
func NewClientNoErr(opts ...RequestOpt) *Client {
	client, _ := NewClient(opts...)
	if client == nil {
		client = &Client{
			client: &http.Client{},
			opts:   opts,
		}
	}
	return client
}

// NewClientFromHTTP 从 http.Client 创建 Client
func NewClientFromHTTP(httpClient *http.Client) (*Client, error) {
	if httpClient == nil {
		return nil, ErrNilClient
	}

	// 确保 Transport 是我们的自定义类型
	if httpClient.Transport == nil {
		httpClient.Transport = &Transport{
			base: &http.Transport{},
		}
	} else {
		switch t := httpClient.Transport.(type) {
		case *Transport:
			// 已经是我们的类型
			if t.base == nil {
				t.base = &http.Transport{}
			}
		case *http.Transport:
			// 包装标准 Transport
			httpClient.Transport = &Transport{
				base: t,
			}
		default:
			return nil, fmt.Errorf("unsupported transport type: %T", t)
		}
	}

	return &Client{
		client: httpClient,
	}, nil
}

// HTTPClient 获取底层 http.Client
func (c *Client) HTTPClient() *http.Client {
	return c.client
}

// RequestOptions 获取默认选项（返回副本）
func (c *Client) RequestOptions() []RequestOpt {
	c.mu.RLock()
	defer c.mu.RUnlock()

	opts := make([]RequestOpt, len(c.opts))
	copy(opts, c.opts)
	return opts
}

// SetOptions 设置默认选项
func (c *Client) SetOptions(opts ...RequestOpt) *Client {
	c.mu.Lock()
	c.opts = opts
	c.mu.Unlock()
	return c
}

// AddOptions 追加默认选项
func (c *Client) AddOptions(opts ...RequestOpt) *Client {
	c.mu.Lock()
	c.opts = append(c.opts, opts...)
	c.mu.Unlock()
	return c
}

// Clone 克隆 Client（深拷贝）
func (c *Client) Clone() *Client {
	c.mu.RLock()
	defer c.mu.RUnlock()

	// 克隆 Transport
	var transport http.RoundTripper
	if c.client.Transport != nil {
		switch t := c.client.Transport.(type) {
		case *Transport:
			transport = &Transport{
				base: t.base.Clone(),
			}
		case *http.Transport:
			transport = t.Clone()
		default:
			transport = c.client.Transport
		}
	}

	return &Client{
		client: &http.Client{
			Transport:     transport,
			CheckRedirect: c.client.CheckRedirect,
			Jar:           c.client.Jar,
			Timeout:       c.client.Timeout,
		},
		opts: append([]RequestOpt(nil), c.opts...),
	}
}

// SetDefaultTLSConfig 设置默认 TLS 配置
func (c *Client) SetDefaultTLSConfig(tlsConfig *tls.Config) *Client {
	if transport, ok := c.client.Transport.(*Transport); ok {
		transport.mu.Lock()
		if tlsConfig != nil {
			transport.base.TLSClientConfig = tlsConfig.Clone()
		} else {
			transport.base.TLSClientConfig = nil
		}
		transport.mu.Unlock()
	}
	return c
}

// SetDefaultSkipTLSVerify 设置默认跳过 TLS 验证
func (c *Client) SetDefaultSkipTLSVerify(skip bool) *Client {
	if transport, ok := c.client.Transport.(*Transport); ok {
		transport.mu.Lock()
		if transport.base.TLSClientConfig == nil {
			transport.base.TLSClientConfig = &tls.Config{}
		} else {
			transport.base.TLSClientConfig = transport.base.TLSClientConfig.Clone()
		}
		transport.base.TLSClientConfig.InsecureSkipVerify = skip
		transport.mu.Unlock()
	}
	return c
}

// DisableRedirect 禁用重定向
func (c *Client) DisableRedirect() *Client {
	c.client.CheckRedirect = func(req *http.Request, via []*http.Request) error {
		return http.ErrUseLastResponse
	}
	return c
}

// EnableRedirect 启用重定向
func (c *Client) EnableRedirect() *Client {
	c.client.CheckRedirect = nil
	return c
}

// NewRequest 创建新请求
func (c *Client) NewRequest(url, method string, opts ...RequestOpt) (*Request, error) {
	return c.NewRequestWithContext(context.Background(), url, method, opts...)
}

// NewRequestWithContext 创建新请求（带 context）
func (c *Client) NewRequestWithContext(ctx context.Context, url, method string, opts ...RequestOpt) (*Request, error) {
	// 合并 Client 级别和请求级别的选项
	c.mu.RLock()
	allOpts := append(append([]RequestOpt(nil), c.opts...), opts...)
	c.mu.RUnlock()

	req, err := newRequest(ctx, url, method, allOpts...)
	if err != nil {
		return nil, err
	}

	req.client = c
	req.httpClient = c.client
	return req, nil
}

// Get 发送 GET 请求
func (c *Client) Get(url string, opts ...RequestOpt) (*Response, error) {
	req, err := c.NewRequest(url, http.MethodGet, opts...)
	if err != nil {
		return nil, err
	}
	return req.Do()
}

// Post 发送 POST 请求
func (c *Client) Post(url string, opts ...RequestOpt) (*Response, error) {
	req, err := c.NewRequest(url, http.MethodPost, opts...)
	if err != nil {
		return nil, err
	}
	return req.Do()
}

// Put 发送 PUT 请求
func (c *Client) Put(url string, opts ...RequestOpt) (*Response, error) {
	req, err := c.NewRequest(url, http.MethodPut, opts...)
	if err != nil {
		return nil, err
	}
	return req.Do()
}

// Delete 发送 DELETE 请求
func (c *Client) Delete(url string, opts ...RequestOpt) (*Response, error) {
	req, err := c.NewRequest(url, http.MethodDelete, opts...)
	if err != nil {
		return nil, err
	}
	return req.Do()
}

// Head 发送 HEAD 请求
func (c *Client) Head(url string, opts ...RequestOpt) (*Response, error) {
	req, err := c.NewRequest(url, http.MethodHead, opts...)
	if err != nil {
		return nil, err
	}
	return req.Do()
}

// Patch 发送 PATCH 请求
func (c *Client) Patch(url string, opts ...RequestOpt) (*Response, error) {
	req, err := c.NewRequest(url, http.MethodPatch, opts...)
	if err != nil {
		return nil, err
	}
	return req.Do()
}

// Options 发送 OPTIONS 请求
func (c *Client) Options(url string, opts ...RequestOpt) (*Response, error) {
	req, err := c.NewRequest(url, http.MethodOptions, opts...)
	if err != nil {
		return nil, err
	}
	return req.Do()
}

// NewSimpleRequest 创建新请求（忽略错误，支持链式调用）
func (c *Client) NewSimpleRequest(url, method string, opts ...RequestOpt) *Request {
	return c.NewSimpleRequestWithContext(context.Background(), url, method, opts...)
}

// NewSimpleRequestWithContext 创建新请求（带 context，忽略错误）
func (c *Client) NewSimpleRequestWithContext(ctx context.Context, url, method string, opts ...RequestOpt) *Request {
	req, err := c.NewRequestWithContext(ctx, url, method, opts...)
	if err != nil {
		// 返回一个带错误的请求，保持与全局 NewSimpleRequest 行为一致
		return &Request{
			ctx:    ctx,
			url:    url,
			method: method,
			err:    err,
			config: &RequestConfig{
				Headers: make(http.Header),
				Queries: make(map[string][]string),
				Body: BodyConfig{
					FormData: make(map[string][]string),
				},
			},
			client:     c,
			httpClient: c.client,
			autoFetch:  DefaultFetchRespBody,
		}
	}
	return req
}