package main

import (
	//"fmt"
	"bytes"
	"html/template"
	"regexp"
	"strconv"
	"strings"
	"sync"
)

type HeaderVars struct {
	NoticeList  []string
	Scripts     []string
	Stylesheets []string
	Widgets     PageWidgets
	Site        *Site
	Settings    map[string]interface{}
	Themes      map[string]Theme // TODO: Use a slice containing every theme instead of the main map for speed
	ThemeName   string
	ExtData     ExtData
}

// TODO: Add this to routes which don't use templates. E.g. Json APIs.
type HeaderLite struct {
	Site     *Site
	Settings SettingBox
	ExtData  ExtData
}

type PageWidgets struct {
	LeftSidebar  template.HTML
	RightSidebar template.HTML
}

// TODO: Add a ExtDataHolder interface with methods for manipulating the contents?
// ? - Could we use a sync.Map instead?
type ExtData struct {
	items map[string]interface{} // Key: pluginname
	sync.RWMutex
}

type Page struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	ItemList    []interface{}
	Something   interface{}
}

type TopicPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	ItemList    []Reply
	Topic       TopicUser
	Page        int
	LastPage    int
}

type TopicsPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	ItemList    []*TopicsRow
}

type ForumPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	ItemList    []*TopicsRow
	Forum       Forum
	Page        int
	LastPage    int
}

type ForumsPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	ItemList    []Forum
}

type ProfilePage struct {
	Title        string
	CurrentUser  User
	Header       *HeaderVars
	ItemList     []Reply
	ProfileOwner User
}

type CreateTopicPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	ItemList    []Forum
	FID         int
}

type IPSearchPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	ItemList    map[int]*User
	IP          string
}

type PanelStats struct {
	Users       int
	Groups      int
	Forums      int
	Settings    int
	WordFilters int
	Themes      int
	Reports     int
}

type PanelPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	Stats       PanelStats
	ItemList    []interface{}
	Something   interface{}
}

type GridElement struct {
	ID         string
	Body       string
	Order      int // For future use
	Class      string
	Background string
	TextColour string
	Note       string
}

type PanelDashboardPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	Stats       PanelStats
	GridItems   []GridElement
}

type PanelThemesPage struct {
	Title         string
	CurrentUser   User
	Header        *HeaderVars
	Stats         PanelStats
	PrimaryThemes []Theme
	VariantThemes []Theme
}

type PanelUserPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	Stats       PanelStats
	ItemList    []User
	PageList    []int
	Page        int
	LastPage    int
}

type PanelGroupPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	Stats       PanelStats
	ItemList    []GroupAdmin
	PageList    []int
	Page        int
	LastPage    int
}

type PanelEditGroupPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	Stats       PanelStats
	ID          int
	Name        string
	Tag         string
	Rank        string
	DisableRank bool
}

type GroupForumPermPreset struct {
	Group  *Group
	Preset string
}

type PanelEditForumPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	Stats       PanelStats
	ID          int
	Name        string
	Desc        string
	Active      bool
	Preset      string
	Groups      []GroupForumPermPreset
}

/*type NameLangPair struct {
	Name    string
	LangStr string
}*/

type NameLangToggle struct {
	Name    string
	LangStr string
	Toggle  bool
}

type PanelEditGroupPermsPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	Stats       PanelStats
	ID          int
	Name        string
	LocalPerms  []NameLangToggle
	GlobalPerms []NameLangToggle
}

type Log struct {
	Action    template.HTML
	IPAddress string
	DoneAt    string
}

type PanelLogsPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	Stats       PanelStats
	Logs        []Log
	PageList    []int
	Page        int
	LastPage    int
}

type PanelDebugPage struct {
	Title       string
	CurrentUser User
	Header      *HeaderVars
	Stats       PanelStats
	Uptime      string
	OpenConns   int
	DBAdapter   string
}

type PageSimple struct {
	Title     string
	Something interface{}
}

type AreYouSure struct {
	URL     string
	Message string
}

var spaceGap = []byte("          ")
var httpProtBytes = []byte("http://")
var invalidURL = []byte("<span style='color: red;'>[Invalid URL]</span>")
var invalidTopic = []byte("<span style='color: red;'>[Invalid Topic]</span>")
var invalidProfile = []byte("<span style='color: red;'>[Invalid Profile]</span>")
var invalidForum = []byte("<span style='color: red;'>[Invalid Forum]</span>")
var urlOpen = []byte("<a href='")
var urlOpen2 = []byte("'>")
var bytesSinglequote = []byte("'")
var bytesGreaterthan = []byte(">")
var urlMention = []byte(" class='mention'")
var urlClose = []byte("</a>")
var urlpattern = `(?s)([ {1}])((http|https|ftp|mailto)*)(:{??)\/\/([\.a-zA-Z\/]+)([ {1}])`
var urlReg *regexp.Regexp

func init() {
	urlReg = regexp.MustCompile(urlpattern)
}

func shortcodeToUnicode(msg string) string {
	//re := regexp.MustCompile(":(.):")
	msg = strings.Replace(msg, ":grinning:", "😀", -1)
	msg = strings.Replace(msg, ":grin:", "😁", -1)
	msg = strings.Replace(msg, ":joy:", "😂", -1)
	msg = strings.Replace(msg, ":rofl:", "🤣", -1)
	msg = strings.Replace(msg, ":smiley:", "😃", -1)
	msg = strings.Replace(msg, ":smile:", "😄", -1)
	msg = strings.Replace(msg, ":sweat_smile:", "😅", -1)
	msg = strings.Replace(msg, ":laughing:", "😆", -1)
	msg = strings.Replace(msg, ":satisfied:", "😆", -1)
	msg = strings.Replace(msg, ":wink:", "😉", -1)
	msg = strings.Replace(msg, ":blush:", "😊", -1)
	msg = strings.Replace(msg, ":yum:", "😋", -1)
	msg = strings.Replace(msg, ":sunglasses:", "😎", -1)
	msg = strings.Replace(msg, ":heart_eyes:", "😍", -1)
	msg = strings.Replace(msg, ":kissing_heart:", "😘", -1)
	msg = strings.Replace(msg, ":kissing:", "😗", -1)
	msg = strings.Replace(msg, ":kissing_smiling_eyes:", "😙", -1)
	msg = strings.Replace(msg, ":kissing_closed_eyes:", "😚", -1)
	msg = strings.Replace(msg, ":relaxed:", "☺️", -1)
	msg = strings.Replace(msg, ":slight_smile:", "🙂", -1)
	msg = strings.Replace(msg, ":hugging:", "🤗", -1)
	msg = strings.Replace(msg, ":thinking:", "🤔", -1)
	msg = strings.Replace(msg, ":neutral_face:", "😐", -1)
	msg = strings.Replace(msg, ":expressionless:", "😑", -1)
	msg = strings.Replace(msg, ":no_mouth:", "😶", -1)
	msg = strings.Replace(msg, ":rolling_eyes:", "🙄", -1)
	msg = strings.Replace(msg, ":smirk:", "😏", -1)
	msg = strings.Replace(msg, ":persevere:", "😣", -1)
	msg = strings.Replace(msg, ":disappointed_relieved:", "😥", -1)
	msg = strings.Replace(msg, ":open_mouth:", "😮", -1)
	msg = strings.Replace(msg, ":zipper_mouth:", "🤐", -1)
	msg = strings.Replace(msg, ":hushed:", "😯", -1)
	msg = strings.Replace(msg, ":sleepy:", "😪", -1)
	msg = strings.Replace(msg, ":tired_face:", "😫", -1)
	msg = strings.Replace(msg, ":sleeping:", "😴", -1)
	msg = strings.Replace(msg, ":relieved:", "😌", -1)
	msg = strings.Replace(msg, ":nerd:", "🤓", -1)
	msg = strings.Replace(msg, ":stuck_out_tongue:", "😛", -1)
	msg = strings.Replace(msg, ":worried:", "😟", -1)
	msg = strings.Replace(msg, ":drooling_face:", "🤤", -1)
	msg = strings.Replace(msg, ":disappointed:", "😞", -1)
	msg = strings.Replace(msg, ":astonished:", "😲", -1)
	msg = strings.Replace(msg, ":slight_frown:", "🙁", -1)
	msg = strings.Replace(msg, ":skull_crossbones:", "☠️", -1)
	msg = strings.Replace(msg, ":skull:", "💀", -1)
	msg = strings.Replace(msg, ":point_up:", "☝️", -1)
	msg = strings.Replace(msg, ":v:", "✌️️", -1)
	msg = strings.Replace(msg, ":writing_hand:", "✍️", -1)
	msg = strings.Replace(msg, ":heart:", "❤️️", -1)
	msg = strings.Replace(msg, ":heart_exclamation:", "❣️", -1)
	msg = strings.Replace(msg, ":hotsprings:", "♨️", -1)
	msg = strings.Replace(msg, ":airplane:", "✈️️", -1)
	msg = strings.Replace(msg, ":hourglass:", "⌛", -1)
	msg = strings.Replace(msg, ":watch:", "⌚", -1)
	msg = strings.Replace(msg, ":comet:", "☄️", -1)
	msg = strings.Replace(msg, ":snowflake:", "❄️", -1)
	msg = strings.Replace(msg, ":cloud:", "☁️", -1)
	msg = strings.Replace(msg, ":sunny:", "☀️", -1)
	msg = strings.Replace(msg, ":spades:", "♠️", -1)
	msg = strings.Replace(msg, ":hearts:", "♥️️", -1)
	msg = strings.Replace(msg, ":diamonds:", "♦️", -1)
	msg = strings.Replace(msg, ":clubs:", "♣️", -1)
	msg = strings.Replace(msg, ":phone:", "☎️", -1)
	msg = strings.Replace(msg, ":telephone:", "☎️", -1)
	msg = strings.Replace(msg, ":biohazard:", "☣️", -1)
	msg = strings.Replace(msg, ":radioactive:", "☢️", -1)
	msg = strings.Replace(msg, ":scissors:", "✂️", -1)
	msg = strings.Replace(msg, ":arrow_upper_right:", "↗️", -1)
	msg = strings.Replace(msg, ":arrow_right:", "➡️", -1)
	msg = strings.Replace(msg, ":arrow_lower_right:", "↘️", -1)
	msg = strings.Replace(msg, ":arrow_lower_left:", "↙️", -1)
	msg = strings.Replace(msg, ":arrow_upper_left:", "↖️", -1)
	msg = strings.Replace(msg, ":arrow_up_down:", "↕️", -1)
	msg = strings.Replace(msg, ":left_right_arrow:", "↔️", -1)
	msg = strings.Replace(msg, ":leftwards_arrow_with_hook:", "↩️", -1)
	msg = strings.Replace(msg, ":arrow_right_hook:", "↪️", -1)
	msg = strings.Replace(msg, ":arrow_forward:", "▶️", -1)
	msg = strings.Replace(msg, ":arrow_backward:", "◀️", -1)
	msg = strings.Replace(msg, ":female:", "♀️", -1)
	msg = strings.Replace(msg, ":male:", "♂️", -1)
	msg = strings.Replace(msg, ":ballot_box_with_check:", "☑️", -1)
	msg = strings.Replace(msg, ":heavy_check_mark:", "✔️️", -1)
	msg = strings.Replace(msg, ":heavy_multiplication_x:", "✖️", -1)
	msg = strings.Replace(msg, ":pisces:", "♓", -1)
	msg = strings.Replace(msg, ":aquarius:", "♒", -1)
	msg = strings.Replace(msg, ":capricorn:", "♑", -1)
	msg = strings.Replace(msg, ":sagittarius:", "♐", -1)
	msg = strings.Replace(msg, ":scorpius:", "♏", -1)
	msg = strings.Replace(msg, ":libra:", "♎", -1)
	msg = strings.Replace(msg, ":virgo:", "♍", -1)
	msg = strings.Replace(msg, ":leo:", "♌", -1)
	msg = strings.Replace(msg, ":cancer:", "♋", -1)
	msg = strings.Replace(msg, ":gemini:", "♊", -1)
	msg = strings.Replace(msg, ":taurus:", "♉", -1)
	msg = strings.Replace(msg, ":aries:", "♈", -1)
	msg = strings.Replace(msg, ":peace:", "☮️", -1)
	msg = strings.Replace(msg, ":eight_spoked_asterisk:", "✳️", -1)
	msg = strings.Replace(msg, ":eight_pointed_black_star:", "✴️", -1)
	msg = strings.Replace(msg, ":snowman2:", "☃️", -1)
	msg = strings.Replace(msg, ":umbrella2:", "☂️", -1)
	msg = strings.Replace(msg, ":pencil2:", "✏️", -1)
	msg = strings.Replace(msg, ":black_nib:", "✒️", -1)
	msg = strings.Replace(msg, ":email:", "✉️", -1)
	msg = strings.Replace(msg, ":envelope:", "✉️", -1)
	msg = strings.Replace(msg, ":keyboard:", "⌨️", -1)
	msg = strings.Replace(msg, ":white_small_square:", "▫️", -1)
	msg = strings.Replace(msg, ":black_small_square:", "▪️", -1)
	msg = strings.Replace(msg, ":secret:", "㊙️", -1)
	msg = strings.Replace(msg, ":congratulations:", "㊗️", -1)
	msg = strings.Replace(msg, ":m:", "Ⓜ️", -1)
	msg = strings.Replace(msg, ":tm:", "™️️", -1)
	msg = strings.Replace(msg, ":registered:", "®️", -1)
	msg = strings.Replace(msg, ":copyright:", "©️", -1)
	msg = strings.Replace(msg, ":wavy_dash:", "〰️", -1)
	msg = strings.Replace(msg, ":bangbang:", "‼️", -1)
	msg = strings.Replace(msg, ":sparkle:", "❇️", -1)
	msg = strings.Replace(msg, ":star_of_david:", "✡️", -1)
	msg = strings.Replace(msg, ":wheel_of_dharma:", "☸️", -1)
	msg = strings.Replace(msg, ":yin_yang:", "☯️", -1)
	msg = strings.Replace(msg, ":cross:", "✝️", -1)
	msg = strings.Replace(msg, ":orthodox_cross:", "☦️", -1)
	msg = strings.Replace(msg, ":star_and_crescent:", "☪️", -1)
	msg = strings.Replace(msg, ":frowning2:", "☹️", -1)
	msg = strings.Replace(msg, ":information_source:", "ℹ️", -1)
	msg = strings.Replace(msg, ":interrobang:", "⁉️", -1)

	return msg
}

func preparseMessage(msg string) string {
	if sshooks["preparse_preassign"] != nil {
		msg = runSshook("preparse_preassign", msg)
	}
	return shortcodeToUnicode(msg)
}

func parseMessage(msg string /*, user User*/) string {
	msg = strings.Replace(msg, ":)", "😀", -1)
	msg = strings.Replace(msg, ":(", "😞", -1)
	msg = strings.Replace(msg, ":D", "😃", -1)
	msg = strings.Replace(msg, ":P", "😛", -1)
	msg = strings.Replace(msg, ":O", "😲", -1)
	msg = strings.Replace(msg, ":p", "😛", -1)
	msg = strings.Replace(msg, ":o", "😲", -1)
	//msg = url_reg.ReplaceAllString(msg,"<a href=\"$2$3//$4\" rel=\"nofollow\">$2$3//$4</a>")

	// Word filter list. E.g. Swear words and other things the admins don't like
	wordFilters := wordFilterBox.Load().(WordFilterBox)
	for _, filter := range wordFilters {
		msg = strings.Replace(msg, filter.Find, filter.Replacement, -1)
	}

	// Search for URLs, mentions and hashlinks in the messages...
	//log.Print("Parser Loop!")
	var msgbytes = []byte(msg)
	var outbytes []byte
	msgbytes = append(msgbytes, spaceGap...)
	//log.Print(`"`+string(msgbytes)+`"`)
	lastItem := 0
	i := 0
	for ; len(msgbytes) > (i + 1); i++ {
		//log.Print("Index:",i)
		//log.Print("Index Item:",msgbytes[i])
		//if msgbytes[i] == 10 {
		//	log.Print("NEWLINE")
		//} else if msgbytes[i] == 32 {
		//	log.Print("SPACE")
		//} else {
		//	log.Print("string(msgbytes[i])",string(msgbytes[i]))
		//}
		//log.Print("End Index")
		if (i == 0 && (msgbytes[0] > 32)) || ((msgbytes[i] < 33) && (msgbytes[i+1] > 32)) {
			//log.Print("IN")
			//log.Print(msgbytes[i])
			if (i != 0) || msgbytes[i] < 33 {
				i++
			}

			if msgbytes[i] == '#' {
				//log.Print("IN #")
				if bytes.Equal(msgbytes[i+1:i+5], []byte("tid-")) {
					outbytes = append(outbytes, msgbytes[lastItem:i]...)
					i += 5
					start := i
					tid, intLen := coerceIntBytes(msgbytes[start:])
					i += intLen

					topic, err := topics.Get(tid)
					if err != nil || !fstore.Exists(topic.ParentID) {
						outbytes = append(outbytes, invalidTopic...)
						lastItem = i
						continue
					}

					outbytes = append(outbytes, urlOpen...)
					var urlBit = []byte(buildTopicURL("", tid))
					outbytes = append(outbytes, urlBit...)
					outbytes = append(outbytes, urlOpen2...)
					var tidBit = []byte("#tid-" + strconv.Itoa(tid))
					outbytes = append(outbytes, tidBit...)
					outbytes = append(outbytes, urlClose...)
					lastItem = i

					//log.Print("string(msgbytes)",string(msgbytes))
					//log.Print(msgbytes)
					//log.Print(msgbytes[lastItem - 1])
					//log.Print(lastItem - 1)
					//log.Print(msgbytes[lastItem])
					//log.Print(lastItem)
				} else if bytes.Equal(msgbytes[i+1:i+5], []byte("rid-")) {
					outbytes = append(outbytes, msgbytes[lastItem:i]...)
					i += 5
					start := i
					rid, intLen := coerceIntBytes(msgbytes[start:])
					i += intLen

					topic, err := getTopicByReply(rid)
					if err != nil || !fstore.Exists(topic.ParentID) {
						outbytes = append(outbytes, invalidTopic...)
						lastItem = i
						continue
					}

					outbytes = append(outbytes, urlOpen...)
					var urlBit = []byte(buildTopicURL("", topic.ID))
					outbytes = append(outbytes, urlBit...)
					outbytes = append(outbytes, urlOpen2...)
					var ridBit = []byte("#rid-" + strconv.Itoa(rid))
					outbytes = append(outbytes, ridBit...)
					outbytes = append(outbytes, urlClose...)
					lastItem = i
				} else if bytes.Equal(msgbytes[i+1:i+5], []byte("fid-")) {
					outbytes = append(outbytes, msgbytes[lastItem:i]...)
					i += 5
					start := i
					fid, intLen := coerceIntBytes(msgbytes[start:])
					i += intLen

					if !fstore.Exists(fid) {
						outbytes = append(outbytes, invalidForum...)
						lastItem = i
						continue
					}

					outbytes = append(outbytes, urlOpen...)
					var urlBit = []byte(buildForumURL("", fid))
					outbytes = append(outbytes, urlBit...)
					outbytes = append(outbytes, urlOpen2...)
					var fidBit = []byte("#fid-" + strconv.Itoa(fid))
					outbytes = append(outbytes, fidBit...)
					outbytes = append(outbytes, urlClose...)
					lastItem = i
				} else {
					// TODO: Forum Shortcode Link
				}
			} else if msgbytes[i] == '@' {
				//log.Print("IN @")
				outbytes = append(outbytes, msgbytes[lastItem:i]...)
				i++
				start := i
				uid, intLen := coerceIntBytes(msgbytes[start:])
				i += intLen

				menUser, err := users.Get(uid)
				if err != nil {
					outbytes = append(outbytes, invalidProfile...)
					lastItem = i
					continue
				}

				outbytes = append(outbytes, urlOpen...)
				var urlBit = []byte(menUser.Link)
				outbytes = append(outbytes, urlBit...)
				outbytes = append(outbytes, bytesSinglequote...)
				outbytes = append(outbytes, urlMention...)
				outbytes = append(outbytes, bytesGreaterthan...)
				var uidBit = []byte("@" + menUser.Name)
				outbytes = append(outbytes, uidBit...)
				outbytes = append(outbytes, urlClose...)
				lastItem = i

				//log.Print(string(msgbytes))
				//log.Print(msgbytes)
				//log.Print(msgbytes[lastItem - 1])
				//log.Print("lastItem - 1",lastItem - 1)
				//log.Print("msgbytes[lastItem]",msgbytes[lastItem])
				//log.Print("lastItem",lastItem)
			} else if msgbytes[i] == 'h' || msgbytes[i] == 'f' || msgbytes[i] == 'g' {
				//log.Print("IN hfg")
				if msgbytes[i+1] == 't' && msgbytes[i+2] == 't' && msgbytes[i+3] == 'p' {
					if msgbytes[i+4] == 's' && msgbytes[i+5] == ':' && msgbytes[i+6] == '/' && msgbytes[i+7] == '/' {
						// Do nothing
					} else if msgbytes[i+4] == ':' && msgbytes[i+5] == '/' && msgbytes[i+6] == '/' {
						// Do nothing
					} else {
						continue
					}
				} else if msgbytes[i+1] == 't' && msgbytes[i+2] == 'p' && msgbytes[i+3] == ':' && msgbytes[i+4] == '/' && msgbytes[i+5] == '/' {
					// Do nothing
				} else if msgbytes[i+1] == 'i' && msgbytes[i+2] == 't' && msgbytes[i+3] == ':' && msgbytes[i+4] == '/' && msgbytes[i+5] == '/' {
					// Do nothing
				} else {
					continue
				}

				outbytes = append(outbytes, msgbytes[lastItem:i]...)
				urlLen := partialURLBytesLen(msgbytes[i:])
				if msgbytes[i+urlLen] != ' ' && msgbytes[i+urlLen] != 10 {
					outbytes = append(outbytes, invalidURL...)
					i += urlLen
					continue
				}
				outbytes = append(outbytes, urlOpen...)
				outbytes = append(outbytes, msgbytes[i:i+urlLen]...)
				outbytes = append(outbytes, urlOpen2...)
				outbytes = append(outbytes, msgbytes[i:i+urlLen]...)
				outbytes = append(outbytes, urlClose...)
				i += urlLen
				lastItem = i
			}
		}
	}

	if lastItem != i && len(outbytes) != 0 {
		//log.Print("lastItem:",msgbytes[lastItem])
		//log.Print("lastItem index:")
		//log.Print(lastItem)
		//log.Print("i:")
		//log.Print(i)
		//log.Print("lastItem to end:")
		//log.Print(msgbytes[lastItem:])
		//log.Print("-----")
		calclen := len(msgbytes) - 10
		if calclen <= lastItem {
			calclen = lastItem
		}
		outbytes = append(outbytes, msgbytes[lastItem:calclen]...)
		msg = string(outbytes)
	}
	//log.Print(`"`+string(outbytes)+`"`)
	//log.Print("msg",`"`+msg+`"`)

	msg = strings.Replace(msg, "\n", "<br>", -1)
	if sshooks["parse_assign"] != nil {
		msg = runSshook("parse_assign", msg)
	}
	return msg
}

func regexParseMessage(msg string) string {
	msg = strings.Replace(msg, ":)", "😀", -1)
	msg = strings.Replace(msg, ":D", "😃", -1)
	msg = strings.Replace(msg, ":P", "😛", -1)
	msg = urlReg.ReplaceAllString(msg, "<a href=\"$2$3//$4\" rel=\"nofollow\">$2$3//$4</a>")
	msg = strings.Replace(msg, "\n", "<br>", -1)
	if sshooks["parse_assign"] != nil {
		msg = runSshook("parse_assign", msg)
	}
	return msg
}

// 6, 7, 8, 6, 7
// ftp://, http://, https:// git://, mailto: (not a URL, just here for length comparison purposes)
func validateURLBytes(data []byte) bool {
	datalen := len(data)
	i := 0

	if datalen >= 6 {
		if bytes.Equal(data[0:6], []byte("ftp://")) || bytes.Equal(data[0:6], []byte("git://")) {
			i = 6
		} else if datalen >= 7 && bytes.Equal(data[0:7], httpProtBytes) {
			i = 7
		} else if datalen >= 8 && bytes.Equal(data[0:8], []byte("https://")) {
			i = 8
		}
	}

	for ; datalen > i; i++ {
		if data[i] != '\\' && data[i] != '_' && !(data[i] > 44 && data[i] < 58) && !(data[i] > 64 && data[i] < 91) && !(data[i] > 96 && data[i] < 123) {
			return false
		}
	}
	return true
}

func validatedURLBytes(data []byte) (url []byte) {
	datalen := len(data)
	i := 0

	if datalen >= 6 {
		if bytes.Equal(data[0:6], []byte("ftp://")) || bytes.Equal(data[0:6], []byte("git://")) {
			i = 6
		} else if datalen >= 7 && bytes.Equal(data[0:7], httpProtBytes) {
			i = 7
		} else if datalen >= 8 && bytes.Equal(data[0:8], []byte("https://")) {
			i = 8
		}
	}

	for ; datalen > i; i++ {
		if data[i] != '\\' && data[i] != '_' && !(data[i] > 44 && data[i] < 58) && !(data[i] > 64 && data[i] < 91) && !(data[i] > 96 && data[i] < 123) {
			return invalidURL
		}
	}

	url = append(url, data...)
	return url
}

func partialURLBytes(data []byte) (url []byte) {
	datalen := len(data)
	i := 0
	end := datalen - 1

	if datalen >= 6 {
		if bytes.Equal(data[0:6], []byte("ftp://")) || bytes.Equal(data[0:6], []byte("git://")) {
			i = 6
		} else if datalen >= 7 && bytes.Equal(data[0:7], httpProtBytes) {
			i = 7
		} else if datalen >= 8 && bytes.Equal(data[0:8], []byte("https://")) {
			i = 8
		}
	}

	for ; end >= i; i++ {
		if data[i] != '\\' && data[i] != '_' && !(data[i] > 44 && data[i] < 58) && !(data[i] > 64 && data[i] < 91) && !(data[i] > 96 && data[i] < 123) {
			end = i
		}
	}

	url = append(url, data[0:end]...)
	return url
}

func partialURLBytesLen(data []byte) int {
	datalen := len(data)
	i := 0

	if datalen >= 6 {
		//log.Print(string(data[0:5]))
		if bytes.Equal(data[0:6], []byte("ftp://")) || bytes.Equal(data[0:6], []byte("git://")) {
			i = 6
		} else if datalen >= 7 && bytes.Equal(data[0:7], httpProtBytes) {
			i = 7
		} else if datalen >= 8 && bytes.Equal(data[0:8], []byte("https://")) {
			i = 8
		}
	}

	for ; datalen > i; i++ {
		if data[i] != '\\' && data[i] != '_' && !(data[i] > 44 && data[i] < 58) && !(data[i] > 64 && data[i] < 91) && !(data[i] > 96 && data[i] < 123) {
			//log.Print("Bad Character:",data[i])
			return i
		}
	}

	//log.Print("Data Length:",datalen)
	return datalen
}

func parseMediaBytes(data []byte) (protocol []byte, url []byte) {
	datalen := len(data)
	i := 0

	if datalen >= 6 {
		if bytes.Equal(data[0:6], []byte("ftp://")) || bytes.Equal(data[0:6], []byte("git://")) {
			i = 6
			protocol = data[0:2]
		} else if datalen >= 7 && bytes.Equal(data[0:7], httpProtBytes) {
			i = 7
			protocol = []byte("http")
		} else if datalen >= 8 && bytes.Equal(data[0:8], []byte("https://")) {
			i = 8
			protocol = []byte("https")
		}
	}

	for ; datalen > i; i++ {
		if data[i] != '\\' && data[i] != '_' && !(data[i] > 44 && data[i] < 58) && !(data[i] > 64 && data[i] < 91) && !(data[i] > 96 && data[i] < 123) {
			return []byte(""), invalidURL
		}
	}

	if len(protocol) == 0 {
		protocol = []byte("http")
	}
	return protocol, data[i:]
}

func coerceIntBytes(data []byte) (res int, length int) {
	if !(data[0] > 47 && data[0] < 58) {
		return 0, 1
	}

	i := 0
	for ; len(data) > i; i++ {
		if !(data[i] > 47 && data[i] < 58) {
			conv, err := strconv.Atoi(string(data[0:i]))
			if err != nil {
				return 0, i
			}
			return conv, i
		}
	}

	conv, err := strconv.Atoi(string(data))
	if err != nil {
		return 0, i
	}
	return conv, i
}

// TODO: Write tests for this
func paginate(count int, perPage int, maxPages int) []int {
	if count < perPage {
		return []int{1}
	}
	var page int
	var out []int
	for current := 0; current < count; current += perPage {
		page++
		out = append(out, page)
		if len(out) >= maxPages {
			break
		}
	}
	return out
}

// TODO: Write tests for this
func pageOffset(count int, page int, perPage int) (int, int, int) {
	var offset int
	lastPage := (count / perPage) + 1
	if page > 1 {
		offset = (perPage * page) - perPage
	} else if page == -1 {
		page = lastPage
		offset = (perPage * page) - perPage
	} else {
		page = 1
	}

	// We don't want the offset to overflow the slices, if everything's in memory
	if offset >= (count - 1) {
		offset = 0
	}
	return offset, page, lastPage
}