package templates

import (
	"html/template"
    "path/filepath"
	"math"
	"math/rand"
	"net/url"
	"strconv"
	"time"
	"os"
	"fmt"

	"strings"

	"github.com/CloudyKit/jet"
	"github.com/NyaaPantsu/nyaa/config"
	"github.com/NyaaPantsu/nyaa/models"
	"github.com/NyaaPantsu/nyaa/models/torrents"
	"github.com/NyaaPantsu/nyaa/utils/categories"
	"github.com/NyaaPantsu/nyaa/utils/filelist"
	"github.com/NyaaPantsu/nyaa/utils/format"
	"github.com/NyaaPantsu/nyaa/utils/publicSettings"
	"github.com/NyaaPantsu/nyaa/utils/torrentLanguages"
)

// FuncMap : Functions accessible in templates by {{ $.Function }}
func templateFunctions(vars jet.VarMap) jet.VarMap {
	vars.Set("getRawQuery", getRawQuery)
	vars.Set("genSearchWithOrdering", genSearchWithOrdering)
	vars.Set("genSearchWithCategory", genSearchWithCategory)
	vars.Set("genSortArrows", genSortArrows)
	vars.Set("genNav", genNav)
	vars.Set("Sukebei", config.IsSukebei)
	vars.Set("getDefaultLanguage", publicSettings.GetDefaultLanguage)
	vars.Set("FlagCode", flagCode)
	vars.Set("getAvatar", getAvatar)
	vars.Set("torrentFileExists", torrentFileExists)
	vars.Set("GetHostname", format.GetHostname)
	vars.Set("GetCategories", categories.GetSelect)
	vars.Set("GetCategory", getCategory)
	vars.Set("CategoryName", categoryName)
	vars.Set("GetCategoryName", GetCategoryName)
	vars.Set("GetTorrentLanguages", torrentLanguages.GetTorrentLanguages)
	vars.Set("GenSearchName", GenSearchName)
	vars.Set("LanguageName", languageName)
	vars.Set("LanguageNameFromCode", languageNameFromCode)
	vars.Set("fileSize", fileSize)
	vars.Set("DefaultUserSettings", defaultUserSettings)
	vars.Set("makeTreeViewData", makeTreeViewData)
	vars.Set("lastID", lastID)
	vars.Set("getReportDescription", getReportDescription)
	vars.Set("genUploaderLink", genUploaderLink)
	vars.Set("genActivityContent", genActivityContent)
	vars.Set("contains", contains)
	vars.Set("strcmp", strcmp)
	vars.Set("strfind", strfind)
	vars.Set("rand", rand.Intn)
	vars.Set("toString", strconv.Itoa)
	vars.Set("getDomainName", getDomainName)
	vars.Set("getThemeList", getThemeList)
	vars.Set("formatThemeName", formatThemeName)
	vars.Set("formatDate", formatDate)
	return vars
}
func getRawQuery(currentURL *url.URL) string {
	return currentURL.RawQuery
}
func genSearchWithOrdering(currentURL *url.URL, sortBy string, searchRoute string) string {
	values := currentURL.Query()
	order := false //Default is DESC
	sort := "2"    //Default is Date (Actually ID, but Date is the same thing)

	if _, ok := values["order"]; ok {
		order, _ = strconv.ParseBool(values["order"][0])
	}
	if _, ok := values["sort"]; ok {
		sort = values["sort"][0]
	}

	if sort == sortBy {
		order = !order //Flip order by repeat-clicking
	} else {
		order = false //Default to descending when sorting by something new
	}

	values.Set("sort", sortBy)
	values.Set("order", strconv.FormatBool(order))

	u, _ := url.Parse(searchRoute)
	u.RawQuery = values.Encode()

	return u.String()
}

func genSearchWithCategory(currentURL *url.URL, category string, searchRoute string) string {
	values := currentURL.Query()
	cat := "_" //Default

	if _, ok := values["c"]; ok {
		cat = values["c"][0]
	}
	
	cat = category

	values.Set("c", cat)

	u, _ := url.Parse(searchRoute)
	u.RawQuery = values.Encode()

	return u.String()
}

func genSortArrows(currentURL *url.URL, sortBy string) template.HTML {
	values := currentURL.Query()
	leftclass := "sortarrowdim"
	rightclass := "sortarrowdim"

	order := false
	sort := "2"

	if _, ok := values["order"]; ok {
		order, _ = strconv.ParseBool(values["order"][0])
	}
	if _, ok := values["sort"]; ok {
		sort = values["sort"][0]
	}

	if sort == sortBy {
		if order {
			rightclass = ""
		} else {
			leftclass = ""
		}
	}

	arrows := "<span class=\"sortarrowleft " + leftclass + "\">▼</span><span class=\"" + rightclass + "\">▲</span>"

	return template.HTML(arrows)
}


func genNav(nav Navigation, currentURL *url.URL, pagesSelectable int) template.HTML {
	var ret = ""
	if nav.TotalItem > 0 {
		maxPages := math.Ceil(float64(nav.TotalItem) / float64(nav.MaxItemPerPage))

		href :=  ""
		display := " style=\"display:none;\""
		if nav.CurrentPage-1 > 0 {
			display = ""
			href = " href=\"" + "/" + nav.Route + "/1" + "?" + currentURL.RawQuery + "\""
		}
		ret = ret + "<a class=\"page-prev\"" + display + href + " aria-label=\"Previous\"><span aria-hidden=\"true\">&laquo;</span></a>"
		
		startValue := 1
		if nav.CurrentPage > pagesSelectable/2 {
			startValue = (int(math.Min((float64(nav.CurrentPage)+math.Floor(float64(pagesSelectable)/2)), maxPages)) - pagesSelectable + 1)
		}
		if startValue < 1 {
			startValue = 1
		}
		endValue := (startValue + pagesSelectable - 1)
		if endValue > int(maxPages) {
			endValue = int(maxPages)
		}
		for i := startValue; i <= endValue; i++ {
			pageNum := strconv.Itoa(i)
			url := "/" + nav.Route + "/" + pageNum
			ret = ret + "<a aria-label=\"Page " + strconv.Itoa(i) + "\" href=\"" + url + "?" + currentURL.RawQuery + "\">" + "<span"
			if i == nav.CurrentPage {
				ret = ret + " class=\"active\""
			}
			ret = ret + ">" + strconv.Itoa(i) + "</span></a>"
		}
		
		href = ""
		display = " style=\"display:none;\""
		if nav.CurrentPage < int(maxPages) {
			display = ""
			href = " href=\"" + "/" + nav.Route + "/" + strconv.Itoa(int(maxPages)) + "?" + currentURL.RawQuery + "\""
		}
		ret = ret + "<a class=\"page-next\"" + display + href +" aria-label=\"Next\"><span aria-hidden=\"true\">&raquo;</span></a>"
			
		itemsThisPageStart := nav.MaxItemPerPage*(nav.CurrentPage-1) + 1
		itemsThisPageEnd := nav.MaxItemPerPage * nav.CurrentPage
		if nav.TotalItem < itemsThisPageEnd {
			itemsThisPageEnd = nav.TotalItem
		}
		ret = ret + "<p>" + strconv.Itoa(itemsThisPageStart) + "-" + strconv.Itoa(itemsThisPageEnd) + "/" + strconv.Itoa(nav.TotalItem) + "</p>"
	}
	return template.HTML(ret)
}

func flagCode(languageCode string) string {
	return publicSettings.Flag(languageCode, true)
}

func getAvatar(hash string, size int) string {
	if hash != "" {
		return "https://www.gravatar.com/avatar/" + hash + "?s=" + strconv.Itoa(size)
	} else {
		if config.IsSukebei() {
			return "/img/sukebei_avatar_" + strconv.Itoa(size) + ".jpg"
		}
		return "/img/avatar_" + strconv.Itoa(size) + ".jpg"
	}
}

func getCategory(category string, keepParent bool) categories.Categories {
	cats := categories.GetSelect(true, true)
	found := false
	categoryRet := categories.Categories{}
	for _, v := range cats {
		if v.ID == category+"_" {
			found = true
			if keepParent {
				categoryRet = append(categoryRet, v)
			}
		} else if len(v.ID) <= 2 && len(categoryRet) > 0 {
			break
		} else if found {
			categoryRet = append(categoryRet, v)
		}
	}
	return categoryRet
}
func categoryName(category string, subCategory string) string {
	return GetCategoryName( category + "_" + subCategory)
}

func GetCategoryName(category string) string {
	if cat, ok := categories.GetByID(category); ok {
		return cat.Name
	}
	return ""
}

func languageName(lang publicSettings.Language, T publicSettings.TemplateTfunc) string {
	if strings.Contains(lang.Name, ",") {
		langs := strings.Split(lang.Name, ", ")
		tags := strings.Split(lang.Tag, ", ")
		for k := range langs {
			langs[k] = strings.Title(publicSettings.Translate(tags[k], string(T("language_code"))))
		}
		return strings.Join(langs, ", ")
	}
	return strings.Title(lang.Translate(T("language_code")))
}
func languageNameFromCode(languageCode string, T publicSettings.TemplateTfunc) string {
	if strings.Contains(languageCode, ",") {
		tags := strings.Split(languageCode, ", ")
		var langs []string
		for k := range tags {
			langs = append(langs, strings.Title(publicSettings.Translate(tags[k], string(T("language_code")))))
		}
		return strings.Join(langs, ", ")
	}
	return strings.Title(publicSettings.Translate(languageCode, string(T("language_code"))))
}
func fileSize(filesize int64, T publicSettings.TemplateTfunc, showUnknown bool) template.HTML {
	if showUnknown && filesize == 0 {
		return T("unknown")
	}
	return template.HTML(format.FileSize(filesize))
}

func defaultUserSettings(s string) bool {
	return config.Get().Users.DefaultUserSettings[s]
}

func makeTreeViewData(f *filelist.FileListFolder, nestLevel int, identifierChain string) interface{} {
	return struct {
		Folder          *filelist.FileListFolder
		NestLevel       int
		IdentifierChain string
	}{f, nestLevel, identifierChain}
}
func lastID(currentURL *url.URL, torrents []models.TorrentJSON) int {
	if len(torrents) == 0 {
		return 0
	}
	values := currentURL.Query()

	order := false
	sort := "2"

	if _, ok := values["order"]; ok {
		order, _ = strconv.ParseBool(values["order"][0])
	}
	if _, ok := values["sort"]; ok {
		sort = values["sort"][0]
	}
	lastID := 0
	if sort == "2" || sort == "" {
		if order {
			lastID = int(torrents[len(torrents)-1].ID)
		} else if len(torrents) > 0 {
			lastID = int(torrents[0].ID)
		}
	}
	return lastID
}
func getReportDescription(d string, T publicSettings.TemplateTfunc) string {
	if d == "illegal" {
		return "Illegal content"
	} else if d == "spam" {
		return "Spam / Garbage"
	} else if d == "wrongcat" {
		return "Wrong category"
	} else if d == "dup" {
		return "Duplicate / Deprecated"
	}
	return string(T(d))
}
func genUploaderLink(uploaderID uint, uploaderName template.HTML, torrentHidden bool) template.HTML {
	uploaderID, username := torrents.HideUser(uploaderID, string(uploaderName), torrentHidden)
	if uploaderID == 0 {
		return template.HTML(username)
	}
	url := "/user/" + strconv.Itoa(int(uploaderID)) + "/" + username

	return template.HTML("<a href=\"" + url + "\">" + username + "</a>")
}
func genActivityContent(a models.Activity, T publicSettings.TemplateTfunc) template.HTML {
	return a.ToLocale(T)
}
func contains(arr interface{}, comp string) bool {
	switch str := arr.(type) {
	case string:
		if str == comp {
			return true
		}
	case publicSettings.Language:
		if str.Code == comp {
			return true
		}
	default:
		return false
	}
	return false
}

func torrentFileExists(hash string, TorrentLink string) bool {
	if(len(config.Get().Torrents.FileStorage) == 0) {
		//File isn't stored on our servers
		return true
	}
	Openfile, err := os.Open(fmt.Sprintf("%s%c%s.torrent", config.Get().Torrents.FileStorage, os.PathSeparator, hash))
	if err != nil || len(TorrentLink) == 0 {
		//File doesn't exist
		return false
	}
	defer Openfile.Close()
	return true
}

func strcmp(str1 string, str2 string, end int, start int) bool {
	//Compare two strings but has length arguments
	
	len1 := len(str1)
	len2 := len(str2)
	
	if end == -1 && len1 != len2 {
		return false
	}
	
	if end == -1 || end > len1 {
		end = len1
	}
	if end > len2 {
		end = len2
	}
	
	if start >= end {
		return false
	}
	
	return strings.Compare(str1[start:end], str2[start:end]) == 0
}

func strfind(str1 string, searchfor string, start int) bool {
	//Search a string inside another with start parameter
	//start parameter indicates where we start searching
	
	len1 := len(str1)
	
	if start >= len1 || searchfor == "" {
		return false
	}
	
	
	return strings.Contains(str1[start:len1], searchfor)
}

func getDomainName() string {
	domain := config.Get().Cookies.DomainName
	if config.Get().Environment == "DEVELOPMENT" {
		domain = ""
	}
	return domain
}

func getThemeList() ([]string) {
    searchDir := "public/css/themes/"

    themeList := []string{}
	
    filepath.Walk(searchDir, func(path string, f os.FileInfo, err error) error {
        if strfind(path, ".css", len(searchDir)) {
			//we only want .css file
			
			fileName := path[len(searchDir):strings.Index(path, ".css")]
			//Remove file extension and path, keep only file name
			
			themeList = append(themeList, fileName)
		}
		return nil
    })

    return themeList
}

func formatThemeName(name string, T publicSettings.TemplateTfunc) string {
	translationString := fmt.Sprintf("themes_%s", name)
	translatedName := string(T(translationString))
	
	if translatedName != translationString {
		//Translation string exists
		return translatedName
	}
			
	if len(name) == 1 {
		name = fmt.Sprintf("/%c/", name[0])
	} else {
		name = strings.Replace(name, "_", " ", -1)
		name = strings.Title(name)
		//Upper case at each start of word
	}
	return name
}

func formatDate(Date time.Time, short bool) string {
	Date = Date.UTC()
	if short {
		return fmt.Sprintf("%.3s %d, %d", Date.Month(), Date.Day(), Date.Year())
	}
	
	if Date.Hour() >= 12 {
		return fmt.Sprintf("%d/%d/%d, %d:%.2d:%.2d PM UTC+0", Date.Month(), Date.Day(), Date.Year(), Date.Hour() - 12, Date.Minute(), Date.Second())
	} else {
		return fmt.Sprintf("%d/%d/%d, %d:%.2d:%.2d AM UTC+0", Date.Month(), Date.Day(), Date.Year(), Date.Hour(), Date.Minute(), Date.Second())
	}
}

func GenSearchName(Search SearchForm, currentURL string, T publicSettings.TemplateTfunc) string {
	if currentURL == "/" {
		return string(T("home"))
	}
	if Search.UserName != "" {
		return Search.UserName
	}
	if Search.NameSearch != "" {
		return Search.NameSearch
	}
	if Search.Category != "" {
		return string(T(GetCategoryName(Search.Category)))
	}
	return string(T("search"))
}