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

    var pseudoClasses = {
        active: 1,
        after: 1,
        before: 1,
        checked: 1,
        default: 1,
        disabled: 1,
        empty: 1,
        enabled: 1,
        'first-child': 1,
        'first-letter': 1,
        'first-line': 1,
        'first-of-type': 1,
        focus: 1,
        hover: 1,
        'in-range': 1,
        indeterminate: 1,
        invalid: 1,
        lang: 1,
        'last-child': 1,
        'last-of-type': 1,
        link: 1,
        not: 1,
        'nth-child': 1,
        'nth-last-child': 1,
        'nth-last-of-type': 1,
        'nth-of-type': 1,
        'only-of-type': 1,
        'only-child': 1,
        optional: 1,
        'out-of-range': 1,
        placeholder: 1,
        'read-only': 1,
        'read-write': 1,
        required: 1,
        root: 1,
        selection: 1,
        target: 1,
        valid: 1,
        visited: 1,
    }

    CodeMirror.registerHelper('hint', 'css', function (cm) {
        var cur = cm.getCursor(),
            token = cm.getTokenAt(cur)
        var inner = CodeMirror.innerMode(cm.getMode(), token.state)
        if (inner.mode.name != 'css') return

        if (token.type == 'keyword' && '!important'.indexOf(token.string) == 0) return { list: ['!important'], from: CodeMirror.Pos(cur.line, token.start), to: CodeMirror.Pos(cur.line, token.end) }

        var start = token.start,
            end = cur.ch,
            word = token.string.slice(0, end - start)
        if (/[^\w$_-]/.test(word)) {
            word = ''
            start = end = cur.ch
        }

        var spec = CodeMirror.resolveMode('text/css')

        var result = []
        function add(keywords) {
            for (var name in keywords) if (!word || name.lastIndexOf(word, 0) == 0) result.push(name)
        }

        var st = inner.state.state
        if (st == 'pseudo' || token.type == 'variable-3') {
            add(pseudoClasses)
        } else if (st == 'block' || st == 'maybeprop') {
            add(spec.propertyKeywords)
        } else if (st == 'prop' || st == 'parens' || st == 'at' || st == 'params') {
            add(spec.valueKeywords)
            add(spec.colorKeywords)
        } else if (st == 'media' || st == 'media_parens') {
            add(spec.mediaTypes)
            add(spec.mediaFeatures)
        }

        if (result.length)
            return {
                list: result,
                from: CodeMirror.Pos(cur.line, start),
                to: CodeMirror.Pos(cur.line, end),
            }
    })
})