/*  typeahead.js for Synchronet BBS 3.15+
    echicken -at- bbs.electronicchicken.com

    Provides the Typeahead object, a blocking or non-blocking string input
    prompt with optional autocomplete suggestions.  Somewhat inspired by
    Twitter's library of the same name.

    Usage:

        load('typeahead.js');
        // All settings are optional
        var options = {
            // x-coordinate (Default: current x position of console cursor)
            'x' : 1,
            // y-coordinate (Default: current y position of console cursor)
            'y' : 1,
            // Length of input prompt (Default: terminal width - prompt length)
            'len' : 64,
            // Height of suggestion box (Default: to the bottom of the terminal)
            'height' : 10,
            // Prompt text (CTRL-A color-codes can be used) (Default: none)
            'prompt' : 'Type something: ',
            // Input box foreground color (Default: LIGHTGRAY)
            'fg' : LIGHTGRAY,
            // Input box background color (Default: BG_BLUE)
            'bg' : BG_BLUE,
            // Autocomplete suggestion foreground color (Default: LIGHTGRAY)
            'sfg' : LIGHTGRAY,
            // Autocomplete suggestion background color (Default: BG_BLUE)
            'sbg' : BG_BLUE,
            // Highlighted autocomplete suggestion foreground color (Default: WHITE)
            'hsfg' : WHITE,
            // Highlighted autocomplete suggestion background color (Default: BG_CYAN)
            'hsbg' : BG_CYAN,
            // Cursor character (Default: ASCII 219 (full block))
            'cursor' : ascii(219),
            // Initial position of cursor within input string (Default: 0)
            'position' : 0,
            // Default text of input string (Default: none)
            'text' : '',
            // An array of datasource functions (see below) (Default: none)
            'datasources' : [ myDataSource ],
            // Seconds of idle input to wait before calling datasources (Default: 1)
            'delay' : 1,
            // Minimum length of input string before datasources are queried (Default: 1)
            'minLength' : 1,
            // Parent frame (Default: none)
            'frame' : someFrameObjectIAlreadyCreated
        };

        var typeahead = new Typeahead(options);

    Datasource functions:

        A datasource function will be called with one argument: the current
        string that is in the input box.  The datasource can examine that
        string, then return an array of autocomplete suggestions.  An
        autocomplete suggestion may be either a String or an Object.  If it's
        an Object, it must have a 'text' property, which is the text to be
        displayed in the list (it can have whatever other properties you want
        to pass along to your script after the user makes a selection.)


    Methods:

        Typeahead.getstr()

            -   Blocking input method a la 'console.getstr()'
            -   Returns a String or an Object after the user hits enter
            -   If an item was selected, the return value will be one of the
                values provided by your datasource(s), otherwise the return
                value is whatever was in the input field
            -   Automatically calls Typeahead.close() after enter is pressed,
                and cleans up the display
            -   If you're using this method, you don't need to use any of
                Typeahead.inkey(), Typeahead.cycle(), Typeahead.updateCursor()
                or Typeahead.close()
            -   Use this method if your script doesn't need to do anything else
                while it waits for input from the user

        Typeahead.inkey(str)

            -   *'Non-blocking' input method, where 'str' is a string of text
                already taken from the user (ideally 1 character in length)
            -   Returns Boolean true if the string was handled by Typeahead
            -   Returns Boolean false if the string was not handled
            -   Returns a String or an Object if the user hit enter
                -   If no item was selected, the return value will be the
                    current text in the input field
                -   If an item was selected, the return value will be either
                    a string or an object representing the selected item
                    (depending on what your datasource function(s) returned)
            -   Use this method if you want to allow your script to do other
                things while waiting for the user to press enter

            *   Non-blocking is a bit of a stretch.  This doesn't block for
                input from the user, but will block execution for as long as
                each datasource lookup takes.

        Typeahead.cycle()

            -   Housekeeping function to be called during the same loop as
                Typeahead.inkey() (see examples below)

        Typeahead.updateCursor()

            -   If you supplied a parent frame for your Typeahead object and
                are cycling it / updating it at the same time that the user
                is giving input, you may want to call this from within your
                input loop just to keep the real cursor positioned at the same
                location as Typeahead's fake one

        Typeahead.close(cleanUp)

            -   Closes your Typeahead
            -   If 'cleanUp' is true, steps will be taken to tidy up the
                user's terminal (probably only necessary if you didn't supply
                a parent frame.)

    Examples:

        load('typeahead.js');

        // This will be our datasource

        var suggester = function (str) {

            var suggestions = [];

            var words = [
                'donuts',
                'coffee',
                'bacon',
                'waffles',
                'toast',
                'peanut butter',
                'buttered toast',
                'buttered waffles',
                'toasted donuts'
            ];

            str = str.toUpperCase();
            suggestions = words.filter(
                function (word) {
                    word = word.toUpperCase();
                    if (word.search(str) > -1) return true;
                    if (str.search(word) > -1) return true;
                    return false;
                }
            );

            return suggestions;

        }

        // Typeahead.getstr() blocking input example (easy)

        console.clear(LIGHTGRAY);

        var typeahead = new Typeahead(
            {   'prompt' : 'Type something: ',
                'datasources' : [suggester]
            }
        );

        var str = typeahead.getstr();
        console.putmsg(str);
        console.pause();

        // Typeahead.inkey(), Typeahead.cycle(), Typeahead.updateCursor()
        // and Typeahead.close() non-blocking input example

        console.clear(LIGHTGRAY);

        var frame = new Frame(
            1,
            1,
            console.screen_columns,
            console.screen_rows,
            LIGHTGRAY
        );
        frame.open();

        var typeahead = new Typeahead(
            {   'prompt' : 'Type something: ',
                'len' : 60,
                'datasources' : [suggester],
                'frame' : frame
            }
        );

        var str = undefined;
        while (typeof str !== 'string') {
            var key = console.inkey(K_NONE, 5);
            str = typeahead.inkey(key);
            if (!str) {
                // Input wasn't handled by Typeahead
                // Do something else with it, if you want
            }
            typeahead.cycle();
            if (frame.cycle()) typeahead.updateCursor();
        }

        typeahead.close();
        frame.close();

        console.clear(LIGHTGRAY);
        console.putmsg(str);
        console.pause();
*/

load('sbbsdefs.js');
load('frame.js');
load('tree.js');

var Typeahead = function (options) {

    var properties = {
        'x' : 0,
        'y' : 0,
        'len' : console.screen_columns,
        'height' : 0,
        'prompt' : '',
        'fg' : LIGHTGRAY,
        'bg' : BG_BLUE,
        'sfg' : LIGHTGRAY,
        'sbg' : BG_BLUE,
        'hsfg' : WHITE,
        'hsbg' : BG_CYAN,
        'cursor' : ascii(219),
        'position' : 0,
        'text' : '',
        'datasources' : [],
        'delay' : 1,
        'minLength' : 1,
        'lastKey' : system.timer,
        'suggested' : false,
        'attr' : console.attributes,
        'focus' : true,
        'maxResults': 0,
    };

    var display = {
        'parentFrame' : undefined,
        'frame' : undefined,
        'inputFrame' : undefined,
        'cursor' : undefined,
        'treeFrame' : undefined,
        'tree' : undefined
    };

    function initSettings() {

        for (var p in properties) {
            if (p === 'datasources') continue;
            if (typeof options[p] !== typeof properties[p]) continue;
            properties[p] = options[p];
        }

        if (properties.x === 0 || properties.y === 0) {
            var xy = console.getxy();
            properties.x = xy.x;
            properties.y = xy.y;
        }

        if (properties.len + properties.prompt.length > console.screen_columns) {
            properties.len = console.screen_columns - properties.prompt.length;
        }

        if (properties.height === 0 ||
            properties.height > console.screen_rows - properties.y
        ) {
            properties.height = console.screen_rows - properties.y;
        }

        if (properties.text !== '') {
            properties.position = properties.text.length + 1;
        }

        if (typeof options.datasources !== 'undefined' && Array.isArray(options.datasources)) {
            properties.datasources = options.datasources.filter(function (d) {
                return (typeof d === 'function');
            });  
        }

    }

    function initDisplay() {

        if (typeof options.frame !== 'undefined') {
            display.parentFrame = options.frame;
        }

        display.frame = new Frame(
            properties.x,
            properties.y,
            properties.prompt.length + properties.len,
            1,
            LIGHTGRAY,
            display.parentFrame
        );
        display.frame.checkbounds = false;
        display.frame.putmsg(properties.prompt);

        display.inputFrame = new Frame(
            display.frame.x + strip_ctrl(properties.prompt).length,
            display.frame.y,
            properties.len,
            1,
            properties.bg|properties.fg,
            display.frame
        );
        display.inputFrame.putmsg(properties.text);

        display.cursor = new Frame(
            display.inputFrame.x + properties.text.length,
            display.inputFrame.y,
            1,
            1,
            properties.bg|properties.fg,
            display.inputFrame
        );
        display.cursor.putmsg(properties.cursor);

        if (properties.datasources.length > 0) {
            display.treeFrame = new Frame(
                display.inputFrame.x,
                display.inputFrame.y + 1,
                display.inputFrame.width,
                properties.height,
                properties.fg,
                display.frame
            );
            display.treeFrame.transparent = true;
        }

        display.frame.open();

    }

    function init() {
        initSettings();
        initDisplay();
    }

    function suggest() {

        var suggestions = [];
        properties.datasources.forEach(function (datasource) {
            suggestions = suggestions.concat(datasource(properties.text));
        });

        if (typeof display.tree != 'undefined') {
            display.tree.close();
            display.treeFrame.invalidate();
        }

        if (suggestions.length < 1) {
            display.tree = undefined;
            return;
        }

        display.tree = new Tree(display.treeFrame);
        display.tree.colors.fg = properties.sfg;
        display.tree.colors.bg = properties.sbg;
        display.tree.colors.lfg = properties.hsfg;
        display.tree.colors.lbg = properties.hsbg;

        display.tree.addItem('');
        for (var n = 0; n < (properties.maxResults || suggestions.length); n++) {
            if (typeof suggestions[n] === 'object' && typeof suggestions[n].text === 'string') {
                var item = display.tree.addItem(suggestions[n].text);
                item.suggestion = suggestions[n];
            } else if (typeof suggestions[n] === 'string') {
                display.tree.addItem(suggestions[n]);
            }
        }

        display.tree.open();

        properties.suggested = true;

    }

    this.inkey = function (key) {
        if (typeof key === 'undefined' || key === '') return;
        var ret = true;
        var change = false;
        switch (key) {
            case '\x0c':    /* CTRL-L */
            case '\x00':    /* CTRL-@ (NULL) */
            case '\x03':    /* CTRL-C */
            case '\x04':    /* CTRL-D */
            case '\x0b':    /* CTRL-K */
            case '\x0e':    /* CTRL-N */
            case '\x0f':    /* CTRL-O */
            case '\x09':    // TAB
            case '\x10':    /* CTRL-P */
            case '\x11':    /* CTRL-Q */
            case '\x12':    /* CTRL-R */
            case '\x13':    /* CTRL-S */
            case '\x14':    /* CTRL-T */
            case '\x15':    /* CTRL-U */
            case '\x16':    /* CTRL-V */
            case '\x17':    /* CTRL-W */
            case '\x18':    /* CTRL-X */
            case '\x19':    /* CTRL-Y */
            case '\x1a':    /* CTRL-Z */
            case '\x1c':    /* CTRL-\ */
            case '\x1f':    /* CTRL-_ */
                ret = false;
                break;
            case KEY_UP:
            case KEY_DOWN:
                if (typeof display.tree !== 'undefined') {
                    display.tree.getcmd(key);
                }
                break;
            case KEY_HOME:
                properties.position = 0;
                break;
            case KEY_END:
                properties.position = display.inputFrame.x + properties.text.length;
                break;
            case KEY_LEFT:
                properties.position = (properties.position === 0) ? 0 : properties.position - 1;
                break;
            case KEY_RIGHT:
                properties.position = (properties.position >= properties.text.length) ? properties.text.length : properties.position + 1;
                break;
            case '\b':
                if (properties.position === 0) break;
                properties.text = properties.text.split('');
                properties.text.splice((properties.position - 1), 1);
                properties.text = properties.text.join('');
                properties.position--;
                change = true;
                break;
            case '\x7f':
                if (properties.position >= properties.text.length) break;
                properties.text = properties.text.split('');
                properties.text.splice((properties.position), 1);
                properties.text = properties.text.join('');
                change = true;
                break;
            case '\r':
            case '\n':
                if (typeof display.tree !== 'undefined' && display.tree.index > 0) {
                    if (typeof display.tree.currentItem.suggestion === 'undefined') {
                        ret = display.tree.currentItem.text;
                    } else {
                        ret = display.tree.currentItem.suggestion;
                    }
                } else {
                    ret = properties.text;
                    properties.text = '';
                    properties.position = 0;
                    change = true;
                }
                break;
            default:
                if (properties.text.length === properties.len) break;
                key = strip_ctrl(key);
                if (properties.position !== properties.text.length) {
                    properties.text = properties.text.split('');
                    properties.text.splice(properties.position, 0, key);
                    properties.text = properties.text.join('');
                } else {
                    properties.text += key;
                }
                properties.position++;
                if (typeof display.tree !== 'undefined') {
                    display.tree.getcmd(KEY_HOME);
                }
                change = true;
                break;
        }
        if (change) {
            display.inputFrame.clear();
            display.inputFrame.putmsg(properties.text);
            properties.lastKey = system.timer;
            properties.suggested = false;
        }
        return ret;
    }

    this.getstr = function () {
        var ret;
        while (typeof ret !== 'string' && typeof ret !== 'object') {
            ret = this.inkey(console.inkey(K_NONE, 5));
            this.cycle();
        }
        this.close(true);
        return ret;
    }

    this.cycle = function () {
        if (!properties.focus) return;
        if (properties.text === '' && typeof display.tree !== 'undefined') {
            display.tree.close();
            display.tree = undefined;
            display.treeFrame.invalidate();
        } else if (
            properties.text.length >= properties.minLength &&
            properties.datasources.length > 0 &&
            system.timer - properties.lastKey > properties.delay &&
            !properties.suggested
        ) {
            suggest();
        }
        display.cursor.moveTo(
            display.inputFrame.x + properties.position,
            display.inputFrame.y
        );
        if (system.timer - properties.lastKey <= .5) {
            display.cursor.top();
        } else {
            display.cursor[time() % 2 === 0 ? 'top' : 'bottom']();
        }
        if (typeof display.parentFrame === 'undefined'
            && display.frame.cycle()
        ) {
            this.updateCursor();
        }
    }

    this.updateCursor = function () {
        console.gotoxy(
            display.inputFrame.x + properties.position,
            display.inputFrame.y
        );
    }

    this.close = function (cleanup) {
        if (typeof display.tree !== 'undefined') display.tree.close();
        display.frame.close();
        if (typeof cleanup === 'boolean' && cleanup) {
            console.attributes = properties.attr;
            if (typeof display.tree !== 'undefined') {
                for (var i = 0; i < display.tree.items.length; i++) {
                    console.line_counter = 0;
                    console.crlf();
                    console.clearline();
                }
            }
            console.gotoxy(1, display.frame.y + 1);
        }
        display.frame.delete();
    }

    this.__defineGetter__('focus', function () {
        return properties.focus;
    });
    this.__defineSetter__('focus', function (bool) {
        if (typeof bool !== 'boolean') return;
        properties.focus = bool;
        if (!bool) {
            display.cursor.bottom();
        } else {
            display.cursor.top();
        }
    });

    init();

}