// 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) {
    var Pos = CodeMirror.Pos

    function forEach(arr, f) {
        for (var i = 0, e = arr.length; i < e; ++i) f(arr[i])
    }

    function arrayContains(arr, item) {
        if (!Array.prototype.indexOf) {
            var i = arr.length
            while (i--) {
                if (arr[i] === item) {
                    return true
                }
            }
            return false
        }
        return arr.indexOf(item) != -1
    }

    function scriptHint(editor, keywords, getToken, options) {
        // Find the token at the cursor
        var cur = editor.getCursor(),
            token = getToken(editor, cur)
        if (/\b(?:string|comment)\b/.test(token.type)) return
        var innerMode = CodeMirror.innerMode(editor.getMode(), token.state)
        if (innerMode.mode.helperType === 'json') return
        token.state = innerMode.state

        // If it's not a 'word-style' token, ignore the token.
        if (!/^[\w$_]*$/.test(token.string)) {
            token = { start: cur.ch, end: cur.ch, string: '', state: token.state, type: token.string == '.' ? 'property' : null }
        } else if (token.end > cur.ch) {
            token.end = cur.ch
            token.string = token.string.slice(0, cur.ch - token.start)
        }

        var tprop = token
        // If it is a property, find out what it is a property of.
        while (tprop.type == 'property') {
            tprop = getToken(editor, Pos(cur.line, tprop.start))
            if (tprop.string != '.') return
            tprop = getToken(editor, Pos(cur.line, tprop.start))
            if (!context) var context = []
            context.push(tprop)
        }
        return { list: getCompletions(token, context, keywords, options), from: Pos(cur.line, token.start), to: Pos(cur.line, token.end) }
    }

    function javascriptHint(editor, options) {
        return scriptHint(
            editor,
            javascriptKeywords,
            function (e, cur) {
                return e.getTokenAt(cur)
            },
            options
        )
    }
    CodeMirror.registerHelper('hint', 'javascript', javascriptHint)

    function getCoffeeScriptToken(editor, cur) {
        // This getToken, it is for coffeescript, imitates the behavior of
        // getTokenAt method in javascript.js, that is, returning "property"
        // type and treat "." as independent token.
        var token = editor.getTokenAt(cur)
        if (cur.ch == token.start + 1 && token.string.charAt(0) == '.') {
            token.end = token.start
            token.string = '.'
            token.type = 'property'
        } else if (/^\.[\w$_]*$/.test(token.string)) {
            token.type = 'property'
            token.start++
            token.string = token.string.replace(/\./, '')
        }
        return token
    }

    function coffeescriptHint(editor, options) {
        return scriptHint(editor, coffeescriptKeywords, getCoffeeScriptToken, options)
    }
    CodeMirror.registerHelper('hint', 'coffeescript', coffeescriptHint)

    var stringProps = ('charAt charCodeAt indexOf lastIndexOf substring substr slice trim trimLeft trimRight ' + 'toUpperCase toLowerCase split concat match replace search').split(' ')
    var arrayProps = ('length concat join splice push pop shift unshift slice reverse sort indexOf ' + 'lastIndexOf every some filter forEach map reduce reduceRight ').split(' ')
    var funcProps = 'prototype apply call bind'.split(' ')
    var javascriptKeywords = (
        'break case catch class const continue debugger default delete do else export extends false finally for function ' +
        'if in import instanceof new null return super switch this throw true try typeof var void while with yield'
    ).split(' ')
    var coffeescriptKeywords = (
        'and break catch class continue delete do else extends false finally for ' +
        'if in instanceof isnt new no not null of off on or return switch then throw true try typeof until void while with yes'
    ).split(' ')

    function forAllProps(obj, callback) {
        if (!Object.getOwnPropertyNames || !Object.getPrototypeOf) {
            for (var name in obj) callback(name)
        } else {
            for (var o = obj; o; o = Object.getPrototypeOf(o)) Object.getOwnPropertyNames(o).forEach(callback)
        }
    }

    function getCompletions(token, context, keywords, options) {
        var found = [],
            start = token.string,
            global = (options && options.globalScope) || window
        function maybeAdd(str) {
            if (str.lastIndexOf(start, 0) == 0 && !arrayContains(found, str)) found.push(str)
        }
        function gatherCompletions(obj) {
            if (typeof obj == 'string') forEach(stringProps, maybeAdd)
            else if (obj instanceof Array) forEach(arrayProps, maybeAdd)
            else if (obj instanceof Function) forEach(funcProps, maybeAdd)
            forAllProps(obj, maybeAdd)
        }

        if (context && context.length) {
            // If this is a property, see if it belongs to some object we can
            // find in the current environment.
            var obj = context.pop(),
                base
            if (obj.type && obj.type.indexOf('variable') === 0) {
                if (options && options.additionalContext) base = options.additionalContext[obj.string]
                if (!options || options.useGlobalScope !== false) base = base || global[obj.string]
            } else if (obj.type == 'string') {
                base = ''
            } else if (obj.type == 'atom') {
                base = 1
            } else if (obj.type == 'function') {
                if (global.jQuery != null && (obj.string == '$' || obj.string == 'jQuery') && typeof global.jQuery == 'function') base = global.jQuery()
                else if (global._ != null && obj.string == '_' && typeof global._ == 'function') base = global._()
            }
            while (base != null && context.length) base = base[context.pop().string]
            if (base != null) gatherCompletions(base)
        } else {
            // If not, just look in the global object, any local scope, and optional additional-context
            // (reading into JS mode internals to get at the local and global variables)
            for (var v = token.state.localVars; v; v = v.next) maybeAdd(v.name)
            for (var c = token.state.context; c; c = c.prev) for (var v = c.vars; v; v = v.next) maybeAdd(v.name)
            for (var v = token.state.globalVars; v; v = v.next) maybeAdd(v.name)
            if (options && options.additionalContext != null) for (var key in options.additionalContext) maybeAdd(key)
            if (!options || options.useGlobalScope !== false) gatherCompletions(global)
            forEach(keywords, maybeAdd)
        }
        return found
    }
})