#include utility.js
#include watcher.js

var AmiInputBox = function(parent) {
    var watchers = new AmiWatcherCollection,
        input = $e({
            tag: 'textarea',
            attrs: {
                cols: '2',
                id: 'message',
                autofocus: 'autofocus',
                maxlength: '0',
            },
        }),
        container = $e({
            attrs: { id: 'inputFieldContainer' },
            child: input,
        });

    parent.appendChild(container);

    watchers.define(['tab', 'enter', 'paste', 'length']);

    var getValue = function() { return input.value; };
    var getStartPos = function() { return input.selectionStart; };
    var setStartPos = function(pos) { input.selectionStart = pos; };
    var getEndPos = function() { return input.selectionEnd; };
    var setEndPos = function(pos) { input.selectionEnd = pos; };

    var reportLength = function() {
        watchers.call('length', pub, [input.value.length]);
    };
    var setValue = function(text) {
        input.value = (text || '').toString();
        reportLength();
    };
    var clear = function() {
        input.value = '';
        reportLength();
    };

    var pub = {
        getValue: getValue,
        setValue: setValue,
        clear: clear,
        getStartPos: getStartPos,
        setStartPos: setStartPos,
        getEndPos: getEndPos,
        setEndPos: setEndPos,
        isEmpty: function() { input.value.length < 1; },
        focus: function() { input.focus(); },
        enter: function(ev) {
            watchers.call('enter', pub, [ev]);
        },
        watch: function(name, watcher) {
            watchers.watch(name, watcher);
        },
        unwatch: function(name, watcher) {
            watchers.unwatch(name, watcher);
        },
        setMaxLength: function(length) {
            input.maxLength = length;
        },
        getWordAtCursor: function() {
            var text = getValue(),
                start = input.selectionStart,
                position = start,
                word = '';

            while(position >= 0 && text.charAt(position - 1) !== ' ' && text.charAt(position - 1) !== "\n") {
                --position;
                word = text.charAt(position) + word;
            }

            return { start: start, word: word };
        },
        insert: function(text) {
            text = (text || '').toString();

            var value = getValue(),
                start = getStartPos(),
                end = getEndPos();

            setValue(value.substring(0, start) + text + value.substring(end));
            setStartPos(start + text.length);
            setEndPos(start + text.length);
        },
        insertAt: function(location, text, strip) {
            if(location < 0)
                throw 'invalid location';
            text = (text || '').toString();
            strip = parseInt(strip);

            var value = getValue(),
                start = value.substring(0, location),
                end = value.substring(location);

            if(strip < 0)
                start = start.slice(0, strip);
            else if(strip > 0)
                end = end.slice(strip);

            setValue(start + text + end);

            var cursor = start.length + text.length;
            setStartPos(cursor);
            setEndPos(cursor);
        },
        insertAround: function(before, after) {
            before = (before || '').toString();
            after = (after || '').toString();

            var value = getValue(),
                start = getStartPos(),
                end = getEndPos();

            setValue(value.substring(0, start) + before + value.substring(start, end) + after + value.substring(end));
            setStartPos(start + before.length);
            setEndPos(end + before.length);
        },
        setClassName: function(className, enabled) {
            input.classList[enabled ? 'add' : 'remove'](className);
        },
        setStyleValue: function(name, value, enabled, single) {
            if(enabled) {
                if(single) {
                    input.style[name] = value;
                } else {
                    var existingStyle = input.style[name];
                    if(existingStyle) {
                        var split = existingStyle.split(' ');
                        if(split.indexOf(value) < 0)
                            input.style[name] += ' ' + value;
                    } else
                        input.style[name] = value;
                }
            } else {
                if(single) {
                    input.style[name] = null;
                } else {
                    var existingStyle = input.style[name];
                    if(existingStyle) {
                        var split = existingStyle.split(' ');
                        if(split.length === 1) {
                            if(split[0] === value)
                                input.style[name] = null;
                        } else if(split.length > 1) {
                            $ari(split, value);
                            input.style[name] = split.join(' ');
                        }
                    }
                }
            }
        },
    };

    input.addEventListener('keydown', function(ev) {
        var key = 'key' in ev ? ev.key : ('which' in ev ? ev.which : ev.keyCode);

        if((key === 'Enter' || key === 13) && !ev.shiftKey && !ev.ctrlKey) {
            watchers.call('enter', pub, [ev]);
            return;
        }

        if((key === 'Tab' || key === 9) && !ev.shiftKey && !ev.ctrlKey) {
            watchers.call('tab', pub, [ev]);
            return;
        }
    });
    input.addEventListener('input', function() {
        reportLength();
    });
    input.addEventListener('paste', function(ev) {
        watchers.call('paste', pub, [ev]);
    });

    return pub;
};