use std::marker::PhantomData;

use crate::processor::memory::mmio::gpu::Colour;
pub use crate::processor::memory::mmio::joypad::{JoypadButtons, JoypadState};
pub use crate::processor::memory::mmio::serial::SerialTarget;
pub use crate::processor::CpuSaveState;
pub use crate::{HEIGHT, WIDTH};
use async_ringbuf::{AsyncHeapConsumer, AsyncHeapProducer, AsyncHeapRb};

pub enum EmulatorMessage {
    Stop,
}

#[derive(Clone, Copy)]
pub enum DownsampleType {
    Linear,
    ZeroOrderHold,
}

pub enum RomFile {
    Path(String),
    Raw(Vec<u8>),
}

pub trait Renderer<Format: From<Colour>> {
    fn prepare(&mut self, width: usize, height: usize);

    fn display(&mut self, buffer: &[Format]);

    fn set_title(&mut self, _title: String) {}

    fn latest_joypad_state(&mut self) -> JoypadState;

    fn set_rumble(&mut self, _rumbling: bool) {}
}

pub struct AudioOutput {
    pub sample_rate: f32,
    pub send_rb: AsyncHeapProducer<[f32; 2]>,
    pub wait_for_output: bool,
    pub downsample_type: DownsampleType,
}

impl AudioOutput {
    pub fn new(
        sample_rate: f32,
        wait_for_output: bool,
        frames_to_buffer: usize,
        downsample_type: DownsampleType,
    ) -> (Self, AsyncHeapConsumer<[f32; 2]>) {
        let rb_len = (sample_rate as usize / 60) * frames_to_buffer;

        let rb = AsyncHeapRb::<[f32; 2]>::new(rb_len);
        let (send_rb, rx) = rb.split();

        (
            Self {
                sample_rate,
                send_rb,
                wait_for_output,
                downsample_type,
            },
            rx,
        )
    }
}

pub trait PocketCamera {
    // resolution - 128x128
    fn capture_greyscale(&mut self) -> [u8; 128 * 128];
}

#[non_exhaustive]
pub struct EmulatorOptions<ColourFormat, R>
where
    ColourFormat: From<Colour> + Clone,
    R: Renderer<ColourFormat>,
{
    pub(crate) window: R,
    pub(crate) tile_window: Option<R>,
    pub(crate) rom: RomFile,
    pub(crate) output: AudioOutput,
    pub(crate) save_path: Option<String>,
    pub(crate) no_save: bool,
    pub(crate) bootrom: Option<RomFile>,
    pub(crate) serial_target: SerialTarget,
    pub(crate) verbose: bool,
    pub(crate) spooky: PhantomData<ColourFormat>,
}

impl<ColourFormat, R> EmulatorOptions<ColourFormat, R>
where
    ColourFormat: From<Colour> + Clone,
    R: Renderer<ColourFormat>,
{
    pub fn new(window: R, rom: RomFile, output: AudioOutput) -> Self {
        Self {
            window,
            tile_window: None,
            rom,
            output,
            save_path: None,
            no_save: false,
            bootrom: None,
            serial_target: SerialTarget::None,
            verbose: false,
            spooky: PhantomData,
        }
    }

    pub fn with_save_path(mut self, path: Option<String>) -> Self {
        self.save_path = path;
        self
    }

    pub fn force_no_save(mut self) -> Self {
        self.no_save = true;
        self
    }

    pub fn with_no_save(mut self, no_save: bool) -> Self {
        self.no_save = no_save;
        self
    }

    pub fn with_verbose(mut self, verbose: bool) -> Self {
        self.verbose = verbose;
        self
    }

    pub fn with_bootrom(mut self, bootrom: Option<RomFile>) -> Self {
        self.bootrom = bootrom;
        self
    }

    pub fn with_stdout(mut self) -> Self {
        self.serial_target = SerialTarget::Stdout;
        self
    }

    pub fn with_serial_target(mut self, target: SerialTarget) -> Self {
        self.serial_target = target;
        self
    }

    pub fn with_tile_window(mut self, window: Option<R>) -> Self {
        self.tile_window = window;
        self
    }

    pub fn verbose(mut self) -> Self {
        self.verbose = true;
        self
    }
}