// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

;(function (mod) {
    if (typeof exports == 'object' && typeof module == 'object')
        // CommonJS
        mod(require('../../lib/codemirror'))
    else if (typeof define == 'function' && define.amd)
        // AMD
        define(['../../lib/codemirror'], mod)
    // Plain browser env
    else mod(CodeMirror)
})(function (CodeMirror) {
    'use strict'

    CodeMirror.defineMode('velocity', function () {
        function parseWords(str) {
            var obj = {},
                words = str.split(' ')
            for (var i = 0; i < words.length; ++i) obj[words[i]] = true
            return obj
        }

        var keywords = parseWords('#end #else #break #stop #[[ #]] ' + '#{end} #{else} #{break} #{stop}')
        var functions = parseWords('#if #elseif #foreach #set #include #parse #macro #define #evaluate ' + '#{if} #{elseif} #{foreach} #{set} #{include} #{parse} #{macro} #{define} #{evaluate}')
        var specials = parseWords(
            '$foreach.count $foreach.hasNext $foreach.first $foreach.last $foreach.topmost $foreach.parent.count $foreach.parent.hasNext $foreach.parent.first $foreach.parent.last $foreach.parent $velocityCount $!bodyContent $bodyContent'
        )
        var isOperatorChar = /[+\-*&%=<>!?:\/|]/

        function chain(stream, state, f) {
            state.tokenize = f
            return f(stream, state)
        }
        function tokenBase(stream, state) {
            var beforeParams = state.beforeParams
            state.beforeParams = false
            var ch = stream.next()
            // start of unparsed string?
            if (ch == "'" && !state.inString && state.inParams) {
                state.lastTokenWasBuiltin = false
                return chain(stream, state, tokenString(ch))
            }
            // start of parsed string?
            else if (ch == '"') {
                state.lastTokenWasBuiltin = false
                if (state.inString) {
                    state.inString = false
                    return 'string'
                } else if (state.inParams) return chain(stream, state, tokenString(ch))
            }
            // is it one of the special signs []{}().,;? Separator?
            else if (/[\[\]{}\(\),;\.]/.test(ch)) {
                if (ch == '(' && beforeParams) state.inParams = true
                else if (ch == ')') {
                    state.inParams = false
                    state.lastTokenWasBuiltin = true
                }
                return null
            }
            // start of a number value?
            else if (/\d/.test(ch)) {
                state.lastTokenWasBuiltin = false
                stream.eatWhile(/[\w\.]/)
                return 'number'
            }
            // multi line comment?
            else if (ch == '#' && stream.eat('*')) {
                state.lastTokenWasBuiltin = false
                return chain(stream, state, tokenComment)
            }
            // unparsed content?
            else if (ch == '#' && stream.match(/ *\[ *\[/)) {
                state.lastTokenWasBuiltin = false
                return chain(stream, state, tokenUnparsed)
            }
            // single line comment?
            else if (ch == '#' && stream.eat('#')) {
                state.lastTokenWasBuiltin = false
                stream.skipToEnd()
                return 'comment'
            }
            // variable?
            else if (ch == '$') {
                stream.eat('!')
                stream.eatWhile(/[\w\d\$_\.{}-]/)
                // is it one of the specials?
                if (specials && specials.propertyIsEnumerable(stream.current())) {
                    return 'keyword'
                } else {
                    state.lastTokenWasBuiltin = true
                    state.beforeParams = true
                    return 'builtin'
                }
            }
            // is it a operator?
            else if (isOperatorChar.test(ch)) {
                state.lastTokenWasBuiltin = false
                stream.eatWhile(isOperatorChar)
                return 'operator'
            } else {
                // get the whole word
                stream.eatWhile(/[\w\$_{}@]/)
                var word = stream.current()
                // is it one of the listed keywords?
                if (keywords && keywords.propertyIsEnumerable(word)) return 'keyword'
                // is it one of the listed functions?
                if (
                    (functions && functions.propertyIsEnumerable(word)) ||
                    (stream.current().match(/^#@?[a-z0-9_]+ *$/i) && stream.peek() == '(' && !(functions && functions.propertyIsEnumerable(word.toLowerCase())))
                ) {
                    state.beforeParams = true
                    state.lastTokenWasBuiltin = false
                    return 'keyword'
                }
                if (state.inString) {
                    state.lastTokenWasBuiltin = false
                    return 'string'
                }
                if (stream.pos > word.length && stream.string.charAt(stream.pos - word.length - 1) == '.' && state.lastTokenWasBuiltin) return 'builtin'
                // default: just a "word"
                state.lastTokenWasBuiltin = false
                return null
            }
        }

        function tokenString(quote) {
            return function (stream, state) {
                var escaped = false,
                    next,
                    end = false
                while ((next = stream.next()) != null) {
                    if (next == quote && !escaped) {
                        end = true
                        break
                    }
                    if (quote == '"' && stream.peek() == '$' && !escaped) {
                        state.inString = true
                        end = true
                        break
                    }
                    escaped = !escaped && next == '\\'
                }
                if (end) state.tokenize = tokenBase
                return 'string'
            }
        }

        function tokenComment(stream, state) {
            var maybeEnd = false,
                ch
            while ((ch = stream.next())) {
                if (ch == '#' && maybeEnd) {
                    state.tokenize = tokenBase
                    break
                }
                maybeEnd = ch == '*'
            }
            return 'comment'
        }

        function tokenUnparsed(stream, state) {
            var maybeEnd = 0,
                ch
            while ((ch = stream.next())) {
                if (ch == '#' && maybeEnd == 2) {
                    state.tokenize = tokenBase
                    break
                }
                if (ch == ']') maybeEnd++
                else if (ch != ' ') maybeEnd = 0
            }
            return 'meta'
        }
        // Interface

        return {
            startState: function () {
                return {
                    tokenize: tokenBase,
                    beforeParams: false,
                    inParams: false,
                    inString: false,
                    lastTokenWasBuiltin: false,
                }
            },

            token: function (stream, state) {
                if (stream.eatSpace()) return null
                return state.tokenize(stream, state)
            },
            blockCommentStart: '#*',
            blockCommentEnd: '*#',
            lineComment: '##',
            fold: 'velocity',
        }
    })

    CodeMirror.defineMIME('text/velocity', 'velocity')
})