window.addEventListener('load', function() {
    // To remember the control_if blockId
    var controlBlockId = '';

    // Change the if block to be more cheerful
    Blockly.Msg.LOGIC_HUE = '#44CC00';

    // Remote previous and next statement from control_if block
    Blockly.defineBlocksWithJsonArray([
        {
          "type": "controls_if",
          "message0": "%{BKY_CONTROLS_IF_MSG_IF} %1",
          "args0": [
            {
              "type": "input_value",
              "name": "IF0",
              "check": "Boolean"
            }
          ],
          "message1": "%{BKY_CONTROLS_IF_MSG_THEN} %1",
          "args1": [
            {
              "type": "input_statement",
              "name": "DO0"
            }
          ],
          "colour": "%{BKY_LOGIC_HUE}",
          "helpUrl": "%{BKY_CONTROLS_IF_HELPURL}",
          "mutator": "controls_if_mutator",
          "extensions": ["controls_if_tooltip"]
        }
    ]);

    // Make control_if mutator icon bigger
    Blockly.Icon.prototype.renderIcon = function(cursorX) {
        if (this.collapseHidden && this.block_.isCollapsed()) {
            this.iconGroup_.setAttribute('display', 'none');
            return cursorX;
        }
        this.iconGroup_.setAttribute('display', 'block');

        var SIZE = 1.7;
        var TOP_MARGIN = 2;
        var LEFT_MARGIN = 5;
        var width = this.SIZE;
        if (this.block_.RTL) {
            cursorX -= width;
        }
        this.iconGroup_.setAttribute('transform',
            'translate(' + LEFT_MARGIN + ',' + TOP_MARGIN + ') scale(' + SIZE + ')');
        this.computeIconLocation();
        if (this.block_.RTL) {
            cursorX -= Blockly.BlockSvg.SEP_SPACE_X;
        } else {
            cursorX += width + Blockly.BlockSvg.SEP_SPACE_X;
        }
        return cursorX;
    };

    // When mouse click occures on Blockly workspace
    Blockly.utils.isRightButton = function(e) {
        var target = e.target;

        // When control_if block is in use
        if (controlBlockId != '') {
            // When the user clicks anywhere outside the mutator and not on the mutator icon
            if (!$(target).is('.blocklyBubbleCanvas') && !$(target).parents().is('.blocklyBubbleCanvas')) {
                if (!$(target).is('.blocklyIconGroup') && !$(target).parents().is('.blocklyIconGroup')) {
                    // Hide the mutator
                    workspace.getBlockById(controlBlockId).mutator.setVisible(false);
                }
            }
        }
        // Disable right click on Blockly workspace
        return false;
    };

    Blockly.Blocks['sumorobot_sleep'] = {
        init: function() {
            this.setColour('#E64C00');
            this.appendDummyInput()
              .appendField('sleep')
                .appendField(new Blockly.FieldTextInput('1000',
                  Blockly.FieldNumber.numberValidator), 'SLEEP');
            this.setPreviousStatement(true);
            this.setNextStatement(true);
        }
    };

    Blockly.Blocks['sumorobot_move'] = {
        init: function() {
            var OPERATORS = [
                ['move stop', 'STOP'],
                ['move left', 'LEFT'],
                ['move right', 'RIGHT'],
                ['move search', 'SEARCH'],
                ['move forward', 'FORWARD'],
                ['move backward', 'BACKWARD']
            ];
            this.setColour('#E60000');
            var dropdown = new Blockly.FieldDropdown(OPERATORS);
            this.appendDummyInput().appendField(dropdown, 'MOVE');
            this.setPreviousStatement(true);
            this.setNextStatement(true);
        }
    };

    Blockly.Blocks['sumorobot_opponent'] = {
        init: function() {
            this.setColour('#0099E6');
            this.appendDummyInput().appendField('opponent');
            this.setOutput(true, 'Boolean');
        }
    };

    Blockly.Blocks['sumorobot_line'] = {
        init: function() {
            var OPERATORS = [
                ['line left', 'LEFT'],
                ['line right', 'RIGHT']
            ];
            this.setColour('#E6BF00');
            var dropdown = new Blockly.FieldDropdown(OPERATORS);
            this.appendDummyInput().appendField(dropdown, 'LINE');
            this.setOutput(true, 'Boolean');
        }
    };

    Blockly.Python['sumorobot_sleep'] = function(block) {
        var code = 'sumorobot.sleep(' + parseFloat(block.getFieldValue('SLEEP')) + ');;' + block.id + '\n';
        return code;
    };

    Blockly.Python['sumorobot_move'] = function(block) {
        var code = 'sumorobot.move(' + block.getFieldValue('MOVE') + ');;' + block.id + '\n';
        return code;
    };

    Blockly.Python['sumorobot_opponent'] = function(block) {
        var code = 'sumorobot.is_opponent();;' + block.id;
        return [code, Blockly.Python.ORDER_ATOMIC];
    };

    Blockly.Python['sumorobot_line'] = function(block) {
        var code = 'sumorobot.is_line(' + block.getFieldValue('LINE') + ');;' + block.id;
        return [code, Blockly.Python.ORDER_ATOMIC];
    };

    // Inject Blockly
    var blocklyArea = document.getElementById('blocklyArea');
    var blocklyDiv = document.getElementById('blocklyDiv');
    workspace = Blockly.inject(blocklyDiv, {
        scrollbars: false,
        media: 'assets/blockly/media/',
        trashcan: true,
        sounds: true,
        zoom: {
            controls: true,
            startScale: 1.2
        },
        toolbox: document.getElementById('toolbox')
    });

    // On Blockly resize
    var onresize = function(e) {
        // Compute the absolute coordinates and dimensions of blocklyArea.
        var element = blocklyArea;
        var x = 0;
        var y = 0;
        do {
            x += element.offsetLeft;
            y += element.offsetTop;
            element = element.offsetParent;
        } while (element);
        // Position blocklyDiv over blocklyArea
        blocklyDiv.style.left = x + 'px';
        blocklyDiv.style.top = y + 'px';
        blocklyDiv.style.width = blocklyArea.offsetWidth + 'px';
        blocklyDiv.style.height = blocklyArea.offsetHeight + 'px';
    };
    window.addEventListener('resize', onresize, false);
    onresize();
    Blockly.svgResize(workspace);

    // Retrieve the blocks
    var code = getLocalStorageItem('sumorobot.blockly');
    // When there is code
    if (code) {
        // Convert it to XML
        var xml = Blockly.Xml.textToDom(code);
        // Resume the blocks from the XML
        Blockly.Xml.domToWorkspace(xml, workspace);
    }
    // On Blockly code change
    function onCodeChanged(event) {
        // When the if condition block was created
        if (event.type == Blockly.Events.CREATE &&
            event.xml.getAttributeNode('type').nodeValue == 'controls_if') {
            // Remember the control_if block id
            controlBlockId = event.blockId;
            // Get the control_if block object
            var block = workspace.getBlockById(event.blockId);
            // When the control_if block doesn't already have an else
            if (block.elseCount_ == 0) {
                // Automatically add the else statement input
                block.elseCount_ = 1;
                block.updateShape_();
            }
        // When the if condition block was removed
        } else if (event.type == Blockly.Events.DELETE &&
            event.oldXml.getAttributeNode('type').nodeValue == 'controls_if') {
            // Remove the control_if block id
            controlBlockId = '';
            // Enable the if condition block
            workspace.updateToolbox(document.getElementById('toolbox'));
        }

        // Only process change and move commands
        if (event.type != Blockly.Events.CHANGE && event.type != Blockly.Events.MOVE) return;

        // Show the code in the ace editor, filter out block IDs
        readOnlyCodingEditor.setValue('\n' + Blockly.Python.workspaceToCode(workspace).replace(/;;.{20}/g, ''));
        readOnlyCodingEditor.clearSelection();

        // Save the code to the local storage
        var xml = Blockly.Xml.workspaceToDom(workspace);
        localStorage.setItem('sumorobot.blockly', Blockly.Xml.domToText(xml));

        // When control_if block is used
        if (controlBlockId != '') {
            // Disable the if condition block
            workspace.updateToolbox(document.getElementById('toolbox_no_if'));
        }
    }

    // Add the change listener to Blockly
    workspace.addChangeListener(onCodeChanged);

    // Set a click listener on the document
    $(document).click(function(e) {
        // Get the event target
        var target = e.target;
        // When control_if block is in use
        if (controlBlockId != '') {
            // When the user clicks anywhere outside the mutator and not on the mutator icon
            if (!$(target).is('.blocklyBubbleCanvas') && !$(target).parents().is('.blocklyBubbleCanvas')) {
                if (!$(target).is('.blocklyIconGroup') && !$(target).parents().is('.blocklyIconGroup')) {
                    // Hide the mutator
                    workspace.getBlockById(controlBlockId).mutator.setVisible(false);
                }
            }
        }
    });
});