// Brake / Tail Light (JavaScript version)
//
// by James Shaughnessy - See www.demonstudios.com/microbit.html for more micro:bit apps!
//
//
// Run in a website via this link:
// https://makecode.microbit.org/_X9oEboXfehL3
//
/*
Shared project:
https://makecode.microbit.org/_X9oEboXfehL3

Raw HTML to embed the Code:
<div style="position:relative;height:calc(300px + 5em);width:100%;overflow:hidden;"><iframe style="position:absolute;top:0;left:0;width:100%;height:100%;" src="https://makecode.microbit.org/---codeembed#pub:_X9oEboXfehL3" allowfullscreen="allowfullscreen" frameborder="0" sandbox="allow-scripts allow-same-origin"></iframe></div>

Raw HTML to embed the Editor:
<div style="position:relative;height:0;padding-bottom:70%;overflow:hidden;"><iframe style="position:absolute;top:0;left:0;width:100%;height:100%;" src="https://makecode.microbit.org/#pub:_X9oEboXfehL3" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"></iframe></div>

Raw HTML to embed the Simulator:
<div style="position:relative;height:0;padding-bottom:81.97%;overflow:hidden;"><iframe style="position:absolute;top:0;left:0;width:100%;height:100%;" src="https://makecode.microbit.org/---run?id=_X9oEboXfehL3" allowfullscreen="allowfullscreen" sandbox="allow-popups allow-forms allow-scripts allow-same-origin" frameborder="0"></iframe></div>
*/

// Installing Instructions For Copying and Pasting Code:
// 1. Launch the MakeCode Editor from microbit.org
// 2. Select "New Project" ensuring 'Code options' shows either "Blocks, JavaScript or Python" or "JavaScript Only"
// 3. It launches in Blocks mode, so select JavaScript at the top to switch to JavaScript mode
// 4. Highlight all the placeholder text in the window (is just an empty basic.forever() function)
// 5. Paste this entire program into the empty window. It should automatically compile
// 6. [Optional] Run on the editor's micro:bit to test it works OK
// 7. Click 'Download' on the bottom left to save the HEX file
// 8. Follow the instructions below for loading a downladed HEX file directly
//
// Installing Instructions For loading a downloaded HEX file directly:
// 1. Connect your micro:bit to your computer. It should show up as a device called MICROBIT.
// 2. Drag the downloaded HEX file onto the MICROBIT drive and the Operating System should install the code
// 3. The program should run automatically
//
//
// Changelog:
// v1.0 (First release for CodeKingdoms JavaScript Editor)
// v1.1 (Updated for the new MakeCode Editor in JavaScript mode (can be auto-converted to Blocks or Python))
// 
//
// Instructions for Use:
// This is a novelty brake/tail light for your bike, scooter, skateboard, or R/C car!
// Using the accelerometer it will make a bright brake light come on when you brake, and if you brake
// really hard the light will flash just like on some cars with LED taillights! There is also a dimmer
// tail light that optionally stays on all the time. You can also choose between a round and a square
// pattern for both the tail light and the brake light.
// It works best when mounted perfectly vertically
//
// Button A: Toggle Head/Tail lights
// Button B: Toggle between Round or Square light pattern

// NOTE: Always use proper bicycle lights when riding at night! This is just a novelty for use in your
// garden or in the park, not on the road!

// Default variable values - defaults to a round tail light and a square brake light
let tailLightOn = true;
let squareModeTail = false;
let squareModeBrake = true;
let braking = false;

input.onButtonPressed(Button.A, function ()
{
    // Toggle whether the tail light is on
    tailLightOn = !tailLightOn;
})

input.onButtonPressed(Button.B, function ()
{
    if (braking)
    {
        // Toggle between a round and a square brake light
        squareModeBrake = !squareModeBrake;
    }
    else
    {
        // Toggle between a round and a square tail light
        squareModeTail = !squareModeTail;
    }
})

basic.forever(function ()
{
    // Get the acceleration in the negative Z-axis (where 1G = 1024)
    let brakeForce = -input.acceleration(Dimension.Z);

    // Get a value that runs from 0-200 every 200ms using modulus (%)
    let flashTimer = Math.floor(input.runningTime() % 200);
    
    // Sets variable to see if we're braking or not. Change this value
    // to vary the sensitivity of the brake light (eg between 32 and 128)
    braking = (brakeForce > 64);
    
    // If we're braking and it's in square brake mode, OR
    // if we're not braking and the tail light is in square mode
    if ((braking && squareModeBrake) ||
        (!braking && squareModeTail))
    {
        // Light all LEDs showing square pattern
        basic.plotLeds(`
            # # # # #
            # # # # #
            # # # # #
            # # # # #
            # # # # #
            `);
    }
    else
    {
        // Light LEDs in a round pattern
        basic.plotLeds(`
            . # # # .
            # # # # #
            # # # # #
            # # # # #
            . # # # .
            `);
    }

    // If we're braking
    if (braking)
    {
        if (brakeForce > 768)
        {
            // Flash the leds between full brightness
            // and dim brightness every 1/10 second (100ms)
            if (flashTimer > 100)
            {
                led.setBrightness(64);
            }
            else
            {
                led.setBrightness(255);
            }
        }
        else
        {
            // Full LED brightness
            led.setBrightness(255);
        }
    }
    else
    {
        // Set LED brightness to fairly dim
        if (tailLightOn)
        {
            led.setBrightness(64);
        }
        else
        {
            // Turn off all LEDs
            led.setBrightness(0);
        }
    }
})