// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/5/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);
    else // Plain browser env
        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";
});
