package games

import (
	"bytes"
	"encoding/json"
	"fmt"
	"hugo-medialog/utils"
	"io/ioutil"
	"net/http"
	"net/url"
	"os"
	"path/filepath"
	"strings"
	"time"
)

type TokenResponse struct {
	AccessToken string `json:"access_token"`
	ExpiresIn   int    `json:"expires_in"`
	TokenType   string `json:"token_type"`
}

func getAccessToken() (string, error) {
	clientID := os.Getenv("TWITCH_CLIENT_ID")
	clientSecret := os.Getenv("TWITCH_SECRET_ID")

	authURL := "https://id.twitch.tv/oauth2/token"

	data := url.Values{}
	data.Set("client_id", clientID)
	data.Set("client_secret", clientSecret)
	data.Set("grant_type", "client_credentials")

	req, err := http.NewRequest("POST", authURL, strings.NewReader(data.Encode()))
	if err != nil {
		return "", err
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return "", fmt.Errorf("error: non-200 response code: %d", resp.StatusCode)
	}

	var tokenResp TokenResponse
	if err := json.NewDecoder(resp.Body).Decode(&tokenResp); err != nil {
		return "", err
	}

	return tokenResp.AccessToken, nil
}

func SearchGameByTitle(title string, game *Game) error {

	clientID := os.Getenv("TWITCH_CLIENT_ID")
	accessToken, err := getAccessToken()
	if err != nil {
		fmt.Printf("Error getting access token: %v\n", err)
		return err
	}

	url := "https://api.igdb.com/v4/games"

	query := fmt.Sprintf("search \"%s\";\nfields id,name,slug,cover,artworks,first_release_date,genres,platforms,screenshots,slug,url;\n", title)
	req, err := http.NewRequest("POST", url, bytes.NewBuffer([]byte(query)))
	if err != nil {
		return err
	}

	req.Header.Set("Client-ID", clientID)
	req.Header.Set("Authorization", "Bearer "+accessToken)
	req.Header.Set("Content-Type", "text/plain")

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return err
	}

	var games []map[string]interface{}
	if err := json.Unmarshal(body, &games); err != nil {
		return err
	}

	if len(games) == 0 {
		return fmt.Errorf("No games found")
	}

	first_game := games[0]

	// Timestamp
	if timestamp, ok := first_game["first_release_date"].(float64); ok {
		game.Year = time.Unix(int64(timestamp), 0).Format("2006")
		game.Subtitle = game.Year
	}
	// Cover
	coverID := first_game["cover"].(float64)
	coverURL, err := makeRequest("covers", coverID)
	if err != nil {
		fmt.Printf("Err: %s", err)
	}
	game.Image = coverURL

	// Artwork
	if artworks, ok := first_game["artworks"].([]interface{}); ok && len(artworks) > 0 {
		artworkURL, err := makeRequest("artworks", artworks[0].(float64))
		if err != nil {
			fmt.Printf("Err: %s", err)
		}
		game.Poster = artworkURL
	}

	// Screenshots
	if screenshots, ok := first_game["screenshots"].([]interface{}); ok && len(screenshots) > 0 {
		artworkURL, err := makeRequest("screenshots", screenshots[0].(float64))
		if err != nil {
			fmt.Printf("Err: %s", err)
		}
		game.Background = artworkURL
	}

	game.ID = int(first_game["id"].(float64))
	game.Link = first_game["url"].(string)

	return nil
}

func getImageURL(imageID int, size string) string {
	return fmt.Sprintf("https://images.igdb.com/igdb/image/upload/t_%s/%d.jpg", size, imageID)
}

// Function to make requests to IGDB
func makeRequest(endpoint string, id float64) (string, error) {

	clientID := os.Getenv("TWITCH_CLIENT_ID")
	accessToken, err := getAccessToken()
	if err != nil {
		fmt.Printf("Error getting access token: %v\n", err)
		return "", err
	}

	// Create the request body
	idStr := fmt.Sprint(id)
	body := fmt.Sprintf("fields id, image_id; where id = (%s);", idStr)

	req, err := http.NewRequest("POST", "https://api.igdb.com/v4/"+endpoint, strings.NewReader(body))
	if err != nil {
		return "", err
	}

	// Add headers
	req.Header.Add("Client-ID", clientID)
	req.Header.Add("Authorization", "Bearer "+accessToken)
	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")

	// Send the request
	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	// Read the response
	responseData, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}

	// Parse the response
	var coverResponse []map[string]interface{}
	err = json.Unmarshal(responseData, &coverResponse)
	if err != nil {
		return "", err
	}

	// Get the image_id and construct the URL
	if len(coverResponse) > 0 {
		imageID := coverResponse[0]["image_id"].(string)
		coverURL := fmt.Sprintf("https://images.igdb.com/igdb/image/upload/t_original/%s.jpg", imageID)
		return coverURL, nil
	}

	return "", fmt.Errorf("no image found for ID %d", id)
}

func DownloadImage(url, slug, suffix string) error {
	imageDir := filepath.Join(os.Getenv("MARKDOWN_OUTPUT_GAMES_DIR"), os.Getenv("IMAGES_OUTPUT_DIR"))
	if err := utils.CreateDirIfNotExists(imageDir); err != nil {
		return err
	}
	filename := fmt.Sprintf("%s%s.jpg", slug, suffix)
	filePath := filepath.Join(imageDir, filename)

	resp, err := http.Get(url)
	if err != nil {
		return fmt.Errorf("error downloading image: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("non-200 response while downloading image: %d", resp.StatusCode)
	}

	file, err := os.Create(filePath)
	if err != nil {
		return fmt.Errorf("error creating image file: %w", err)
	}
	defer file.Close()

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return fmt.Errorf("error reading image data: %w", err)
	}

	_, err = file.Write(body)
	if err != nil {
		return fmt.Errorf("error writing image data: %w", err)
	}

	fmt.Printf(" - Image saved successfully at: %s\n", filePath)
	return nil
}