#![no_std]
#![feature(asm, used, const_fn, naked_functions, alloc, box_syntax)]
#![no_main]
#![feature(extern_prelude)]

#[macro_use]
extern crate hcl;

#[macro_use]
extern crate alloc;

use core::mem;
use hcl::platform::gpio;
use hcl::platform::irq;
use hcl::platform::rcc;
use hcl::platform::scs;
use hcl::platform::timer;
use hcl::platform::usart;
use hcl::platform::dma;
use hcl::dma::*;

mod systick;
mod printer;
mod max6675;
mod st7735;
mod logo;
mod freesans;

use printer::UsartPrinter;
use st7735::gfx::{PrimitveGFX, GFX};
use st7735::bitmaps::BitmapGFX;
use st7735::fonts::FontRenderer;

use freesans::FREE_SANS_FONT;

fn configure_clocks(rcc: &mut rcc::RCC) {
    rcc.clock_control.set_hse_on(true);
    while !rcc.clock_control.hse_ready() {}

    rcc.clock_config
        .configure(|c| {
            c.set_pll_multiplier(10)
            .set_pll_source(rcc::PllSource::HsiDiv2)
        });

    rcc.clock_control.set_pll_on(true);
    while !rcc.clock_control.pll_ready() {}

    rcc.clock_config
        .switch_clock_source(rcc::SystemClockSource::Pll);
}



hcl_ivt!{
    systick => systick::isr;
}

fn configure_peripherals(rcc: &mut hcl::platform::rcc::RCC,
                         gpio_a: &mut gpio::GPIO,
                         gpio_c: &mut gpio::GPIO,
                         usart: &mut usart::USART) {
    rcc.apb2_enable
        .configure(|a| a.set_gpio_a(true).set_gpio_c(true).set_spi1(true));
    rcc.apb1_enable.configure(|a| a.set_usart2(true));

    gpio_a.configure(|g| {
        g.set_mode(2, gpio::PinMode::Output50MHz)
        .set_output_config(2, gpio::OutputConfig::AfPushPull)
        .set_mode(3, gpio::PinMode::Output50MHz)
        .set_output_config(3, gpio::OutputConfig::AfPushPull)
        // SCK1
        .set_mode(5, gpio::PinMode::Output50MHz)
        .set_output_config(5, gpio::OutputConfig::AfPushPull)
        // MOSI1
        .set_mode(7, gpio::PinMode::Output50MHz)
        .set_output_config(7, gpio::OutputConfig::AfPushPull)
        // MISO1
        .set_mode(6, gpio::PinMode::Input)
        .set_input_config(6, gpio::InputConfig::PullUpDown)
        // SS MAX6675
        .set_mode(9, gpio::PinMode::Output50MHz)
        .set_output_config(9, gpio::OutputConfig::PushPull)
        // ST7735 cs pin
        .set_mode(0, gpio::PinMode::Output50MHz)
        .set_output_config(0, gpio::OutputConfig::PushPull)
        // ST7735 rst pin
        .set_mode(1, gpio::PinMode::Output50MHz)
        .set_output_config(1, gpio::OutputConfig::PushPull)
        // ST7735 rs pin
        .set_mode(4, gpio::PinMode::Output50MHz)
        .set_output_config(4, gpio::OutputConfig::PushPull)
        // ST7735 led pin
        .set_mode(8, gpio::PinMode::Output50MHz)
        .set_output_config(8, gpio::OutputConfig::PushPull)
    });

    gpio_c.configure(|g| {
        g.set_mode(13, gpio::PinMode::Output50MHz)
        .set_output_config(13, gpio::OutputConfig::PushPull)
    });


    usart.configure(|u| {
        u.set_enabled(true)
        .set_tx_enabled(true)
        .set_baudgen((21, 11))
    }); // 115.2 kbaud
}


// allowing inlining into main() breaks the stack, since main() must be naked to set up a process stack.
#[inline(never)]
fn run(mut scs: scs::Instance, mut p: hcl::platform::Instance) {
    configure_clocks(&mut p.rcc);
    systick::configure(&mut scs.systick);
    configure_peripherals(&mut p.rcc, &mut p.gpio_a, &mut p.gpio_c, &mut p.usart2);

    //let mut printer = UsartPrinter::init(p.usart2);


    let mut spi = p.spi1;
    let mut gpio = p.gpio_a;

    let mut st7735 = st7735::St7735::new(st7735::DisplayType::RED_18_BLACKTAB, 0, 1, 4, 8);

    let mut st7735io = st7735.start(spi, gpio);
    loop {
        st7735io.init();
        st7735io.set_orientation(st7735::DisplayOrientation::Landscape);
        st7735io.fill_rect(0, 0, 160, 128, st7735::COLOR_BLACK);

        systick::delay_ms(100);
        st7735io.fill_rect(4, 4, 76, 60, st7735::COLOR_RED);
        systick::delay_ms(100);
        st7735io.fill_rect(4, 64, 76, 60, st7735::COLOR_GREEN);
        systick::delay_ms(100);
        st7735io.fill_rect(80, 4, 76, 60, st7735::COLOR_BLUE);
        systick::delay_ms(100);
        st7735io.fill_rect(80, 64, 76, 60, st7735::COLOR_YELLOW);
        systick::delay_ms(100);

        st7735io.draw_circle(80, 64, 20, st7735::COLOR_MAGENTA);

        st7735io.draw_line(4, 4, 80, 64, st7735::COLOR_GREEN);

        systick::delay_ms(1000);
        st7735io.draw_mono_bitmap(11, 4, &logo::LOGO_BW, st7735::COLOR_WHITE, st7735::COLOR_BLACK);
        systick::delay_ms(1000);
        st7735io.draw_color_bitmap(11, 4, &logo::LOGO_COLOR);
        systick::delay_ms(1000);
        st7735io.draw_text(20, 20, "Hello World", &FREE_SANS_FONT, 1, st7735::COLOR_RED);
        systick::delay_ms(5000);
    }
    let (st7735, mut spi, mut gpio) = st7735io.done();

    /*
    loop {



        let res = max6675::read(&mut spi, &mut gpio, 9);

        let msg = match res {
            Ok(temp) => format!("> {}\r\n", temp).into_bytes(),
            Err(err) => format!("Error > {}\r\n", err).into_bytes(),
        };

        printer.print(msg);

        let old = p.gpio_c.output();
        p.gpio_c.set_output(old ^ (1<<13));

        systick::delay_ms(1000);
    }
    */
}


entry_point!(main);
fn main(scs: scs::Instance, p: hcl::platform::Instance) {
    declare_thread_stack!(stack, 3072);

    unsafe {
        hcl::set_process_stack(&stack);
        hcl::use_process_stack(true);
    }

    run(scs, p);
}