$(function () {
    var App = {
        init: function () {
            var config = this.config[this.state.decoder.readers[0].format] || this.config.default;
            config = $.extend(true, {}, config, this.state);
            Quagga.init(config, () => {
                App.attachListeners();
                Quagga.start();
            });
        },
        config: {
            'default': {
                inputStream: {
                    name: 'Test',
                    type: 'ImageStream',
                    length: 10,
                    size: 800
                },
                locator: {
                    patchSize: 'medium',
                    halfSample: true
                }
            },
            'i2of5_reader': {
                inputStream: {
                    size: 800,
                    type: 'ImageStream',
                    length: 5
                },
                locator: {
                    patchSize: 'small',
                    halfSample: false
                }
            }
        },
        attachListeners: function () {
            var self = this;

            $('.controls').on('click', 'button.next', event => {
                event.preventDefault();
                Quagga.start();
            });

            $('.controls .reader-config-group').on('change', 'input, select', event => {
                event.preventDefault();
                var $target = $(event.target),
                    value = $target.attr('type') === 'checkbox' ? $target.prop('checked') : $target.val(),
                    name = $target.attr('name'),
                    states = self._convertNameToStates(name);

                console.log(`Value of ${states} changed to ${value}`);
                self.setState(states, value);
            });
        },
        detachListeners: function () {
            $('.controls').off('click', 'button.next');
            $('.controls .reader-config-group').off('change', 'input, select');
        },
        _accessByPath: function (obj, path, val) {
            var parts = path.split('.'),
                depth = parts.length,
                setter = (typeof val !== 'undefined') ? true : false;

            return parts.reduce(function (o, key, i) {
                if (setter && (i + 1) === depth) {
                    o[key] = val;
                }
                return key in o ? o[key] : {};
            }, obj);
        },
        _convertNameToStates: function (names) {
            return names.split(';').map(this._convertNameToState.bind(this));
        },
        _convertNameToState: function (name) {
            return name.replace('_', '.').split('-').reduce((result, value) => {
                return result + value.charAt(0).toUpperCase() + value.substring(1);
            });
        },
        setState: function (paths, value) {
            var self = this;

            paths.forEach(function (path) {
                var mappedValue;

                if (typeof self._accessByPath(self.inputMapper, path) === 'function') {
                    mappedValue = self._accessByPath(self.inputMapper, path)(value);
                }
                self._accessByPath(self.state, path, mappedValue);
            });

            console.log(JSON.stringify(self.state));
            App.detachListeners();
            Quagga.stop();
            App.init();
        },
        inputMapper: {
            decoder: {
                readers: function (value) {
                    if (value === 'ean_extended') {
                        return [{
                            format: 'ean_reader',
                            config: {
                                supplements: [
                                    'ean_5_reader', 'ean_2_reader'
                                ]
                            }
                        }];
                    }
                    return [{
                        format: value + '_reader',
                        config: {}
                    }];
                }
            },
            inputStream: {
                src: value => `../test/fixtures/${value}/`
            }
        },
        state: {
            inputStream: {
                src: '../test/fixtures/code_128/'
            },
            decoder: {
                readers: [{
                    format: 'code_128_reader',
                    config: {}
                }]
            }
        }
    };

    App.init();
    window.App = App;

    Quagga.onProcessed(function (result) {
        var drawingCtx = Quagga.canvas.ctx.overlay,
            drawingCanvas = Quagga.canvas.dom.overlay;

        if (result) {
            if (result.boxes) {
                drawingCtx.clearRect(0, 0, parseInt(drawingCanvas.getAttribute('width')), parseInt(drawingCanvas.getAttribute('height')));
                result.boxes.forEach(box => {
                    if (box !== result.box) {
                        Quagga.ImageDebug.drawPath(box, drawingCtx, 'green', 2);
                    }
                });
            }

            if (result.box) {
                Quagga.ImageDebug.drawPath(result.box, drawingCtx, '#00F', 2);
            }

            if (result.codeResult && result.codeResult.code) {
                Quagga.ImageDebug.drawPath(result.line, drawingCtx, 'red', 3);
            }
        }
    });

    Quagga.onDetected(function (result) {
        var $node,
            canvas = Quagga.canvas.dom.image,
            detectedCode = result.codeResult.code;

        $node = $('<li><div class="thumbnail"><div class="imgWrapper"><img /></div><div class="caption"><h4 class="code"></h4></div></div></li>');
        $node.find('img').attr('src', canvas.toDataURL());
        $node.find('h4.code').html(detectedCode);
        $('#result_strip ul.thumbnails').prepend($node);
    });
});