package main

import (
	"bytes"
	"compress/gzip"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"sync"
	"time"
)

// QwantAPIResponse represents the JSON response structure from Qwant API
type QwantAPIResponse struct {
	Data struct {
		Result struct {
			Items []struct {
				Media string `json:"media"`
				//Thumbnail string `json:"thumbnail"`
				Title  string `json:"title"`
				Url    string `json:"url"`
				Width  int    `json:"width"`
				Height int    `json:"height"`
			} `json:"items"`
		} `json:"result"`
	} `json:"data"`
}

func ConvertToQwantLocale(langCode string) string {
	langMap := map[string]string{
		"en":    "en_us", // English
		"af":    "en_us", // Afrikaans (no direct match, default to English)
		"ar":    "ar",    // Arabic
		"hy":    "en_us", // Armenian (no direct match, default to English)
		"be":    "en_us", // Belarusian (no direct match, default to English)
		"bg":    "bg_bg", // Bulgarian
		"ca":    "ca_es", // Catalan
		"zh-CN": "zh_cn", // Chinese Simplified
		"zh-TW": "zh_hk", // Chinese Traditional
		"hr":    "en_us", // Croatian (no direct match, default to English)
		"cs":    "cs_cz", // Czech
		"da":    "da_dk", // Danish
		"nl":    "nl_nl", // Dutch
		"eo":    "en_us", // Esperanto (no direct match, default to English)
		"et":    "et_ee", // Estonian
		"tl":    "en_us", // Tagalog (no direct match, default to English)
		"fi":    "fi_fi", // Finnish
		"fr":    "fr_fr", // French
		"de":    "de_de", // German
		"el":    "el_gr", // Greek
		"iw":    "he_il", // Hebrew
		"hi":    "en_us", // Hindi (no direct match, default to English)
		"hu":    "hu_hu", // Hungarian
		"is":    "en_us", // Icelandic (no direct match, default to English)
		"id":    "en_us", // Indonesian (no direct match, default to English)
		"it":    "it_it", // Italian
		"ja":    "ja_jp", // Japanese
		"ko":    "ko_kr", // Korean
		"lv":    "en_us", // Latvian (no direct match, default to English)
		"lt":    "en_us", // Lithuanian (no direct match, default to English)
		"no":    "nb_no", // Norwegian
		"fa":    "en_us", // Persian (no direct match, default to English)
		"pl":    "pl_pl", // Polish
		"pt":    "pt_pt", // Portuguese
		"ro":    "ro_ro", // Romanian
		"ru":    "ru_ru", // Russian
		"sr":    "en_us", // Serbian (no direct match, default to English)
		"sk":    "en_us", // Slovak (no direct match, default to English)
		"sl":    "en_us", // Slovenian (no direct match, default to English)
		"es":    "es_es", // Spanish
		"sw":    "en_us", // Swahili (no direct match, default to English)
		"sv":    "sv_se", // Swedish
		"th":    "th_th", // Thai
		"tr":    "tr_tr", // Turkish
		"uk":    "en_us", // Ukrainian (no direct match, default to English)
		"vi":    "en_us", // Vietnamese (no direct match, default to English)
		"":      "en_us", // Default to English if no language is provided
	}

	if qwantLocale, exists := langMap[langCode]; exists {
		return qwantLocale
	}
	printWarn("Qwant locale code missing: %v, defaulting to: en_us", langCode)
	return "en_us" // Default fallback
}

// PerformQwantImageSearch performs an image search on Qwant and returns the results.
func PerformQwantImageSearch(query, safe, lang string, page int) ([]ImageSearchResult, time.Duration, error) {
	startTime := time.Now() // Start the timer

	const resultsPerPage = 50
	var offset int
	if page <= 1 {
		offset = 0
	} else {
		offset = (page - 1) * resultsPerPage
	}

	// Ensure count + offset is within acceptable limits
	if offset+resultsPerPage > 250 {
		return nil, 0, fmt.Errorf("count + offset must be lower than 250 for Qwant")
	}

	if safe == "" {
		safe = "0"
	}

	lang = ConvertToQwantLocale(lang)

	apiURL := fmt.Sprintf("https://api.qwant.com/v3/search/images?t=images&q=%s&count=%d&locale=%s&offset=%d&device=desktop&tgp=2&safesearch=%s",
		url.QueryEscape(query),
		resultsPerPage,
		lang,
		offset,
		safe)

	// Create the HTTP request
	req, err := http.NewRequest("GET", apiURL, nil)
	if err != nil {
		return nil, 0, fmt.Errorf("creating request: %v", err)
	}

	// Get the User-Agent string
	ImageUserAgent, err := GetUserAgent("Image-Search-Qwant")
	if err != nil {
		return nil, 0, fmt.Errorf("getting user-agent: %v", err)
	}
	req.Header.Set("User-Agent", ImageUserAgent)

	// Perform the request with MetaProxy if enabled
	resp, err := DoMetaProxyRequest(req)
	if err != nil {
		return nil, 0, fmt.Errorf("making request: %v", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, 0, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
	}

	// Read and (if gzip) decompress body
	var bodyReader io.ReadCloser = resp.Body
	if resp.Header.Get("Content-Encoding") == "gzip" {
		gr, err := gzip.NewReader(resp.Body)
		if err != nil {
			printDebug("Failed to init gzip reader: %v", err)
		} else {
			bodyReader = gr
			defer gr.Close()
		}
	}

	var apiResp QwantAPIResponse

	bodyBytes, err := io.ReadAll(bodyReader)
	if err != nil {
		printDebug("Failed to read response body: %v", err)
	} else {
		printDebug("Qwant response body:\n%s", string(bodyBytes))
	}

	// Decode JSON from bodyBytes
	if err := json.Unmarshal(bodyBytes, &apiResp); err != nil {
		return nil, 0, fmt.Errorf("failed to decode JSON: %v\nRaw:\n%s", err, string(bodyBytes))
	}

	// Optional: recreate body for reuse
	resp.Body = io.NopCloser(bytes.NewReader(bodyBytes))
	// Process the results
	var wg sync.WaitGroup
	results := make([]ImageSearchResult, len(apiResp.Data.Result.Items))

	for i, item := range apiResp.Data.Result.Items {
		wg.Add(1)
		go func(i int, item struct {
			Media string `json:"media"`
			//Thumbnail string `json:"thumbnail"`
			Title  string `json:"title"`
			Url    string `json:"url"`
			Width  int    `json:"width"`
			Height int    `json:"height"`
		}) {
			defer wg.Done()

			// Populate the result
			results[i] = ImageSearchResult{
				Thumb:  item.Media, // item.Thumbnail is not working
				Title:  item.Title,
				Full:   item.Media,
				Source: item.Url,
				Width:  item.Width,
				Height: item.Height,
			}
		}(i, item)
	}

	// Wait for all goroutines to complete
	wg.Wait()

	duration := time.Since(startTime) // Calculate the duration

	if len(results) == 0 {
		return nil, duration, fmt.Errorf("no images found")
	}

	return results, duration, nil
}