package main

import (
	"fmt"
	"net/http"
	"net/url"
	"strings"

	"github.com/PuerkitoBio/goquery"
)

const NYAA_DOMAIN = "nyaa.si"

type Nyaa struct{}

func NewNyaa() *Nyaa {
	return &Nyaa{}
}

func (n *Nyaa) Name() string {
	return "nyaa"
}

func (n *Nyaa) getCategoryCode(cat string) string {
	switch cat {
	case "all":
		return ""
	case "anime":
		return "&c=1_0"
	case "music":
		return "&c=2_0"
	case "game":
		return "&c=6_2"
	case "software":
		return "&c=6_1"
	default:
		return "ignore"
	}
}

func (n *Nyaa) Search(query string, category string) ([]TorrentResult, error) {
	categoryCode := n.getCategoryCode(category)
	if categoryCode == "ignore" {
		return []TorrentResult{}, nil
	}

	searchURL := fmt.Sprintf("https://%s/?f=0&q=%s%s", NYAA_DOMAIN, url.QueryEscape(query), categoryCode)

	userAgent, err := GetUserAgent("files-nyaa")
	if err != nil {
		return nil, err
	}

	req, err := http.NewRequest("GET", searchURL, nil)
	if err != nil {
		return nil, err
	}
	req.Header.Set("User-Agent", userAgent)

	resp, err := DoMetaProxyRequest(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

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

	doc, err := goquery.NewDocumentFromReader(resp.Body)
	if err != nil {
		return nil, err
	}

	var results []TorrentResult
	doc.Find(".default, .success, .danger").Each(func(i int, s *goquery.Selection) {
		tds := s.Find("td")
		if tds.Length() < 7 {
			return
		}

		title := tds.Eq(1).Find("a").Last().Text()
		magnet, _ := tds.Eq(2).Find("a").Last().Attr("href")
		sizeStr := strings.TrimSpace(tds.Eq(3).Text())
		byteSize := parseSize(sizeStr)

		seeders := parseInt(tds.Eq(5).Text())
		leechers := parseInt(tds.Eq(6).Text())

		results = append(results, TorrentResult{
			URL:      "https://" + NYAA_DOMAIN,
			Title:    title,
			Magnet:   applyTrackers(magnet),
			Size:     formatSize(byteSize),
			Seeders:  seeders,
			Leechers: leechers,
			Views:    0,
		})
	})

	// Reverse the results slice, so It's from newest to oldest, but the orders is still kinda random
	for i, j := 0, len(results)-1; i < j; i, j = i+1, j-1 {
		results[i], results[j] = results[j], results[i]
	}

	return results, nil
}