#include <windows.h>

#include <assert.h>
#include <stdlib.h>
#include <string.h>

#include "board/io4.h"

#include "mu3hook/mu3-dll.h"

#include "util/dprintf.h"

static HRESULT mu3_io4_poll(void *ctx, struct io4_state *state);
static HRESULT mu3_io4_write_gpio(uint8_t* payload, size_t len);

static uint16_t coins;

static const struct io4_ops mu3_io4_ops = {
    .poll = mu3_io4_poll,
    .write_gpio = mu3_io4_write_gpio,
};

HRESULT mu3_io4_hook_init(const struct io4_config *cfg)
{
    HRESULT hr;

    assert(mu3_dll.init != NULL);

    hr = io4_hook_init(cfg, &mu3_io4_ops, NULL);

    if (FAILED(hr)) {
        return hr;
    }

    return mu3_dll.init();
}

static HRESULT mu3_io4_poll(void *ctx, struct io4_state *state)
{
    uint8_t opbtn;
    uint8_t left;
    uint8_t right;
    int16_t lever;
    HRESULT hr;

    assert(mu3_dll.poll != NULL);
    assert(mu3_dll.get_opbtns != NULL);
    assert(mu3_dll.get_gamebtns != NULL);
    assert(mu3_dll.get_lever != NULL);

    memset(state, 0, sizeof(*state));

    hr = mu3_dll.poll();

    if (FAILED(hr)) {
        return hr;
    }

    opbtn = 0;
    left = 0;
    right = 0;
    lever = 0;

    mu3_dll.get_opbtns(&opbtn);
    mu3_dll.get_gamebtns(&left, &right);
    mu3_dll.get_lever(&lever);

    if (opbtn & MU3_IO_OPBTN_TEST) {
        state->buttons[0] |= IO4_BUTTON_TEST;
    }

    if (opbtn & MU3_IO_OPBTN_SERVICE) {
        state->buttons[0] |= IO4_BUTTON_SERVICE;
    }

    if (opbtn & MU3_IO_OPBTN_COIN) {
        coins++;
    }
    state->chutes[0] = coins << 8;

    if (left & MU3_IO_GAMEBTN_1) {
        state->buttons[0] |= 1 << 0;
    }

    if (left & MU3_IO_GAMEBTN_2) {
        state->buttons[0] |= 1 << 5;
    }

    if (left & MU3_IO_GAMEBTN_3) {
        state->buttons[0] |= 1 << 4;
    }

    if (right & MU3_IO_GAMEBTN_1) {
        state->buttons[0] |= 1 << 1;
    }

    if (right & MU3_IO_GAMEBTN_2) {
        state->buttons[1] |= 1 << 0;
    }

    if (right & MU3_IO_GAMEBTN_3) {
        state->buttons[0] |= 1 << 15;
    }

    if (left & MU3_IO_GAMEBTN_MENU) {
        state->buttons[1] |= 1 << 14;
    }

    if (right & MU3_IO_GAMEBTN_MENU) {
        state->buttons[0] |= 1 << 13;
    }

    if (!(left & MU3_IO_GAMEBTN_SIDE)) {
        state->buttons[1] |= 1 << 15;   /* L-Side, active-low */
    }

    if (!(right & MU3_IO_GAMEBTN_SIDE)) {
        state->buttons[0] |= 1 << 14;   /* R-Side, active-low */
    }

    /* Lever increases right-to-left, not left-to-right.

       Use 0x7FFF as the center point instead of 0x8000; the latter would
       overflow when the lever pos is INT16_MIN. */

    state->adcs[0] = 0x7FFF - lever;

    return S_OK;
}

static HRESULT mu3_io4_write_gpio(uint8_t* payload, size_t len) 
{
    // Just fast fail if there aren't enough bytes in the payload
    if (len < 3) 
        return S_OK;

    // This command is used for lights in Ongeki, but it only contains button lights,
    // and only in the first 3 bytes of the payload; everything else is padding to
    // make the payload 62 bytes. The rest of the cabinet lights and the side button
    // lights are handled separately, by the 15093 lights controller.
    uint32_t lights_data = (uint32_t) ((uint8_t)(payload[0]) << 24 |
        (uint8_t)(payload[1]) << 16 |
        (uint8_t)(payload[2]) << 8);

    // Since Sega uses an odd ordering for the first part of the bitfield,
    // let's normalize the data and just send over bytes for the receiver
    // to interpret as RGB values.
    uint8_t rgb_out[6 * 3] = {
        lights_data & MU3_IO_LED_L1_R ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_L1_G ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_L1_B ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_L2_R ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_L2_G ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_L2_B ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_L3_R ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_L3_G ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_L3_B ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_R1_R ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_R1_G ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_R1_B ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_R2_R ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_R2_G ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_R2_B ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_R3_R ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_R3_G ? 0xFF : 0x00,
        lights_data & MU3_IO_LED_R3_B ? 0xFF : 0x00,
    };

    mu3_dll.led_set_leds(1, rgb_out);

    return S_OK;
}