// 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'

    var WORD = /[\w$]+/,
        RANGE = 500

    CodeMirror.registerHelper('hint', 'anyword', function (editor, options) {
        var word = (options && options.word) || WORD
        var range = (options && options.range) || RANGE
        var cur = editor.getCursor(),
            curLine = editor.getLine(cur.line)
        var end = cur.ch,
            start = end
        while (start && word.test(curLine.charAt(start - 1))) --start
        var curWord = start != end && curLine.slice(start, end)

        var list = (options && options.list) || [],
            seen = {}
        var re = new RegExp(word.source, 'g')
        for (var dir = -1; dir <= 1; dir += 2) {
            var line = cur.line,
                endLine = Math.min(Math.max(line + dir * range, editor.firstLine()), editor.lastLine()) + dir
            for (; line != endLine; line += dir) {
                var text = editor.getLine(line),
                    m
                while ((m = re.exec(text))) {
                    if (line == cur.line && m[0] === curWord) continue
                    if ((!curWord || m[0].lastIndexOf(curWord, 0) == 0) && !Object.prototype.hasOwnProperty.call(seen, m[0])) {
                        seen[m[0]] = true
                        list.push(m[0])
                    }
                }
            }
        }
        return { list: list, from: CodeMirror.Pos(cur.line, start), to: CodeMirror.Pos(cur.line, end) }
    })
})