package wikitext_parser

import "strings"

type DescriptionList struct {
	Name    []interface{}
	Entries []interface{}
}

type UnorderedList struct {
	Entries []interface{}
}

func ParseUnorderedList(text string, index int, depth int, indent int, startCharacter byte) (i int, list *UnorderedList) {

	list = &UnorderedList{}
	var c byte
	lastToken := index

	var currentValue []interface{}

	addValue := func() int {
		if lastToken < len(text) && i-lastToken > 0 {
			t := strings.TrimSpace(text[lastToken:i])
			if len(t) > 0 {
				currentValue = append(currentValue, text[lastToken:i])
			}

			return len(t)
		}

		return 0
	}

	afterNewLine := true
	processIndent := true

	indentation := 0

	for i = index; i < len(text); i++ {
		c = text[i]

		if c == ' ' || c == '\t' {
			//keep the check for new line
			if !afterNewLine {
				processIndent = false
			}
		} else if processIndent && c == startCharacter {
			indentation++
			lastToken = i + 1
			afterNewLine = false
		} else if afterNewLine { //no new list values
			if len(currentValue) > 0 {
				list.Entries = append(list.Entries, currentValue)
				currentValue = []interface{}{}
			}
			return lastToken, list
		} else if indentation > indent {
			if len(currentValue) > 0 {
				list.Entries = append(list.Entries, currentValue)
				currentValue = []interface{}{}
			}
			var level *UnorderedList
			var scanIndex int
			scanIndex, level = ParseUnorderedList(text, lastToken-indentation, depth+1, indentation, startCharacter)
			if level != nil {
				list.Entries = append(list.Entries, level)
			}
			lastToken = scanIndex
			i = scanIndex - 1
			indentation = 0
			afterNewLine = true
			processIndent = true
		} else if indentation < indent {
			if len(currentValue) > 0 {
				list.Entries = append(list.Entries, currentValue)
				currentValue = []interface{}{}
			}
			return lastToken - indentation, list
		} else if c == '\n' {
			addValue()
			if len(currentValue) > 0 {
				list.Entries = append(list.Entries, currentValue)
				currentValue = []interface{}{}
			}
			indentation = 0
			lastToken = i + 1
			afterNewLine = true
			processIndent = true
		} else if (c == '{' && i < len(text)-1 && text[i+1] == '{') || (c == '[' && i < len(text)-1 && text[i+1] == '[') {
			addValue()
			var tpl *Template
			var scanIndex int
			scanIndex, tpl = ParseTemplate(text, i+2, depth+1, c)
			if tpl != nil {
				currentValue = append(currentValue, tpl)
			}
			lastToken = scanIndex
			i = scanIndex - 1
		} else if (c == '{' && i < len(text)-1 && text[i+1] != '{' && text[i+1] != '[') || (c == '[' && i < len(text)-1 && text[i+1] != '[' && text[i+1] != '{') {
			addValue()
			var link *Link
			var scanIndex int
			scanIndex, link = ParseLink(text, i+1, depth+1, c)
			if link != nil {
				currentValue = append(currentValue, link)
			}
			lastToken = scanIndex
			i = scanIndex - 1
		} else if c == '<' { //html trigger
			addValue()
			var html *HTML
			var scanIndex int
			scanIndex, html = ParseHTML(text, i, depth+1)
			if html != nil {
				currentValue = append(currentValue, html)
			}
			lastToken = scanIndex
			i = scanIndex - 1
		} else {
			processIndent = false
		}
	}

	return
}

func ParseDescriptionList(text string, index int, depth int) (i int, list *DescriptionList) {

	var c byte
	lastToken := index

	list = &DescriptionList{}

	hasKey := false

	addValue := func() int {
		if lastToken < len(text) && i-lastToken > 0 {
			t := strings.TrimSpace(text[lastToken:i])
			if len(t) > 0 {
				if !hasKey {
					list.Name = append(list.Name, text[lastToken:i])
				} else {
					list.Entries = append(list.Entries, text[lastToken:i])
				}
			}

			return len(t)
		}

		return 0
	}

	afterNewLine := false

	for i = index; i < len(text); i++ {
		c = text[i]

		if c == ' ' || c == '\t' {
			//keep the check for new line
		} else if c == ':' {
			addValue()
			lastToken = i + 1
			afterNewLine = false
			hasKey = true
		} else if afterNewLine { //no new list values
			return lastToken, list
		} else if c == '\n' {
			addValue()
			lastToken = i + 1
			afterNewLine = true
			hasKey = true
		} else if (c == '{' && i < len(text)-1 && text[i+1] == '{') || (c == '[' && i < len(text)-1 && text[i+1] == '[') {
			addValue()
			var tpl *Template
			var scanIndex int
			scanIndex, tpl = ParseTemplate(text, i+2, depth+1, c)
			if tpl != nil {
				if !hasKey {
					list.Name = append(list.Name, tpl)
				} else {
					list.Entries = append(list.Entries, tpl)
				}
			}
			lastToken = scanIndex
			i = scanIndex - 1
		} else if (c == '{' && i < len(text)-1 && text[i+1] != '{' && text[i+1] != '[') || (c == '[' && i < len(text)-1 && text[i+1] != '[' && text[i+1] != '{') {
			addValue()
			var link *Link
			var scanIndex int
			scanIndex, link = ParseLink(text, i+1, depth+1, c)
			if link != nil {
				if !hasKey {
					list.Name = append(list.Name, link)
				} else {
					list.Entries = append(list.Entries, link)
				}
			}
			lastToken = scanIndex
			i = scanIndex - 1
		} else if c == '<' { //html trigger
			addValue()
			var html *HTML
			var scanIndex int
			scanIndex, html = ParseHTML(text, i, depth+1)
			if html != nil {
				if !hasKey {
					list.Name = append(list.Name, html)
				} else {
					list.Entries = append(list.Entries, html)
				}
			}
			lastToken = scanIndex
			i = scanIndex - 1
		}
	}

	return
}