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

// Defines jumpToLine command. Uses dialog.js if present.

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

    // default search panel location
    CodeMirror.defineOption('search', { bottom: false })

    function dialog(cm, text, shortText, deflt, f) {
        if (cm.openDialog) cm.openDialog(text, f, { value: deflt, selectValueOnOpen: true, bottom: cm.options.search.bottom })
        else f(prompt(shortText, deflt))
    }

    function getJumpDialog(cm) {
        return (
            cm.phrase('Jump to line:') +
            ' <input type="text" style="width: 10em" class="CodeMirror-search-field"/> <span style="color: #888" class="CodeMirror-search-hint">' +
            cm.phrase('(Use line:column or scroll% syntax)') +
            '</span>'
        )
    }

    function interpretLine(cm, string) {
        var num = Number(string)
        if (/^[-+]/.test(string)) return cm.getCursor().line + num
        else return num - 1
    }

    CodeMirror.commands.jumpToLine = function (cm) {
        var cur = cm.getCursor()
        dialog(cm, getJumpDialog(cm), cm.phrase('Jump to line:'), cur.line + 1 + ':' + cur.ch, function (posStr) {
            if (!posStr) return

            var match
            if ((match = /^\s*([\+\-]?\d+)\s*\:\s*(\d+)\s*$/.exec(posStr))) {
                cm.setCursor(interpretLine(cm, match[1]), Number(match[2]))
            } else if ((match = /^\s*([\+\-]?\d+(\.\d+)?)\%\s*/.exec(posStr))) {
                var line = Math.round((cm.lineCount() * Number(match[1])) / 100)
                if (/^[-+]/.test(match[1])) line = cur.line + line + 1
                cm.setCursor(line - 1, cur.ch)
            } else if ((match = /^\s*\:?\s*([\+\-]?\d+)\s*/.exec(posStr))) {
                cm.setCursor(interpretLine(cm, match[1]), cur.ch)
            }
        })
    }

    CodeMirror.keyMap['default']['Alt-G'] = 'jumpToLine'
})