package scraper

import (
	"bytes"
	"encoding/json"
	"log"
	"net/http"
	"net/http/cookiejar"
	"net/url"
	"time"

	"golang.org/x/net/publicsuffix"
)

// Session represents a persistent HTTP session
type Session struct {
	client    *http.Client
	headers   map[string]string
	baseURL   string
	UserAgent string
}

// NewSession creates a new session with browser-like headers
func NewSession() *Session {
	// Create cookie jar first
	jar, err := cookiejar.New(&cookiejar.Options{
		PublicSuffixList: publicsuffix.List,
	})
	if err != nil {
		log.Fatal(err)
	}

	return &Session{
		client: &http.Client{
			Timeout: 30 * time.Second,
			Jar:     jar, // Set the cookie jar
		},
		headers: map[string]string{
			"User-Agent":                "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36",
			"Accept":                    "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
			"Accept-Language":           "en-US,en;q=0.5",
			"Accept-Encoding":           "gzip, deflate, br",
			"Connection":                "keep-alive",
			"Upgrade-Insecure-Requests": "1",
		},
		UserAgent: "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36",
	}
}

// SetHeader sets a header for all subsequent requests
func (s *Session) SetHeader(key, value string) {
	s.headers[key] = value
}

// SetHeaders sets multiple headers at once
func (s *Session) SetHeaders(headers map[string]string) {
	for key, value := range headers {
		s.headers[key] = value
	}
}

// SetBaseURL sets the base URL for relative paths
func (s *Session) SetBaseURL(baseURL string) {
	s.baseURL = baseURL
}

// Get performs a GET request
func (s *Session) Get(url string, headers ...map[string]string) (*http.Response, error) {
	// Use base URL if set and url is relative
	fullURL := s.buildURL(url)

	req, err := http.NewRequest("GET", fullURL, nil)
	if err != nil {
		return nil, err
	}

	s.setDefaultHeaders(req)

	// Add any additional headers provided
	if len(headers) > 0 {
		for key, value := range headers[0] {
			req.Header.Set(key, value)
		}
	}

	return s.client.Do(req)
}

// Post performs a POST request with form data
func (s *Session) Post(url string, data map[string]string, headers ...map[string]string) (*http.Response, error) {
	fullURL := s.buildURL(url)

	// This is the corrected line - url.Values is from net/url package
	formData := make(url.Values)
	for key, value := range data {
		formData.Add(key, value)
	}

	req, err := http.NewRequest("POST", fullURL, bytes.NewBufferString(formData.Encode()))
	if err != nil {
		return nil, err
	}

	s.setDefaultHeaders(req)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	// Add any additional headers provided
	if len(headers) > 0 {
		for key, value := range headers[0] {
			req.Header.Set(key, value)
		}
	}

	return s.client.Do(req)
}

// PostJSON performs a POST request with JSON data
func (s *Session) PostJSON(url string, data interface{}, headers ...map[string]string) (*http.Response, error) {
	fullURL := s.buildURL(url)

	jsonData, err := json.Marshal(data)
	if err != nil {
		return nil, err
	}

	req, err := http.NewRequest("POST", fullURL, bytes.NewBuffer(jsonData))
	if err != nil {
		return nil, err
	}

	s.setDefaultHeaders(req)
	req.Header.Set("Content-Type", "application/json")

	// Add any additional headers provided
	if len(headers) > 0 {
		for key, value := range headers[0] {
			req.Header.Set(key, value)
		}
	}

	return s.client.Do(req)
}

// buildURL constructs the full URL using baseURL if set
func (s *Session) buildURL(path string) string {
	if s.baseURL != "" && !isAbsoluteURL(path) {
		return s.baseURL + path
	}
	return path
}

// isAbsoluteURL checks if the URL is absolute
func isAbsoluteURL(urlStr string) bool {
	u, err := url.Parse(urlStr)
	return err == nil && u.Scheme != "" && u.Host != ""
}

// setDefaultHeaders sets the default browser-like headers
func (s *Session) setDefaultHeaders(req *http.Request) {
	for key, value := range s.headers {
		req.Header.Set(key, value)
	}
}

// GetCookies returns cookies for a given URL
func (s *Session) GetCookies(urlStr string) []*http.Cookie {
	u, err := url.Parse(urlStr)
	if err != nil {
		return nil
	}
	return s.client.Jar.Cookies(u)
}

// SetCookies sets cookies for a given URL
func (s *Session) SetCookies(urlStr string, cookies []*http.Cookie) {
	u, err := url.Parse(urlStr)
	if err != nil {
		return
	}
	s.client.Jar.SetCookies(u, cookies)
}