package wikitext_parser

import "strings"

type Link struct {
	URL        string
	IsExternal bool
	Name       []interface{}
}

func ParseLink(text string, index int, depth int, startCharacter byte) (i int, link *Link) {

	var c byte
	lastToken := index

	addValue := func() int {
		if lastToken < len(text) && i-lastToken > 0 {
			t := strings.TrimSpace(text[lastToken:i])
			if len(t) > 0 {
				if link == nil {
					link = &Link{URL: t, IsExternal: startCharacter == '['}
				} else {
					link.Name = append(link.Name, t)
				}
			}

			return len(t)
		}

		return 0
	}

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

		if c == ' ' || c == '\t' && link == nil {
			addValue()
			lastToken = i + 1
		} else if startCharacter == '{' && c == '}' {
			addValue()
			i += 1
			break
		} else if startCharacter == '[' && c == ']' { //end of link
			addValue()
			i += 1
			break
			//template or light might have parameters
		} 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 link == nil {
					link = &Link{}
				}

				link.Name = append(link.Name, tpl)
			}
			lastToken = scanIndex
			i = scanIndex - 1
		}
	}

	return
}