#![no_std]
#![no_main]

use esp_hal::{
    clock::ClockControl,
    peripherals::Peripherals,
    gpio::*,
    prelude::*,
    systimer::SystemTimer,
    timer::TimerGroup,
    Rtc,
    IO,
    Delay,
};

use core::mem::MaybeUninit;
use alloc::string::String;
use keypad2::Keypad;
use esp_println::println;
use esp_backtrace as _;

extern crate alloc;

// === Global allocator for heap-based types (like String) ===
#[global_allocator]
static ALLOCATOR: esp_alloc::EspHeap = esp_alloc::EspHeap::empty();

fn init_heap() {
  
    const HEAP_SIZE: usize = 32 * 1024;
    static mut HEAP: MaybeUninit<[u8; HEAP_SIZE]> = MaybeUninit::uninit();

    unsafe {
        // TODO: initialize the global allocator using the static heap above
        todo!("Call `ALLOCATOR.init(...)` with correct pointer and size");
    }
}

#[entry]
fn main() -> ! {
    init_heap();

    // === Take peripherals and configure system clocks ===
    let peripherals = Peripherals::take();
    let mut system = peripherals.SYSTEM.split();

    // TODO: Set up the system clocks using `ClockControl` and freeze them
    let clocks = todo!("Initialize and freeze system clocks");

    // === Disable watchdog timers ===
    // These are enabled by default on ESP chips and must be disabled
    let mut rtc = Rtc::new(peripherals.LPWR);
    let mut wdt0 = TimerGroup::new(peripherals.TIMG0, &clocks).wdt;
    let mut wdt1 = TimerGroup::new(peripherals.TIMG1, &clocks).wdt;

    // TODO: Disable all watchdog timers
    todo!("Disable RWDT, WDT0, and WDT1");

    // === Initialize delay handler ===
    let mut delay = Delay::new(&clocks);

    // === GPIO pin setup ===
    let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);

    // === Initialize the Keypad ===
    let mut keypad = Keypad::new( todo!("Initialize Keypad"));

    // === Main loop: password entry logic ===
    loop {
        // TODO: Loop that reads the key input from the keypad.
        // # for entering a number
        // * for clearning the input
        // When password is wrong -> display wrong + red led blinking
        // When password is right -> display right + green led blinking
        todo!();
    }
}