#include "game_render.h"

#include <array>
#include <cstdint>
#include <stdio.h>

#include "tilemap.h"

namespace {

const void *get_sprite_pointer(uint16_t spriteIndex) {
    return &tilemapTiles[spriteIndex * 16];
}

void draw_snake_head(const GameState &state, const RenderAssets &assets, uint16_t &oamId) {
    const std::array<int, 3> dot = state.snake.front();
    bool hflip = false;
    bool vflip = false;

    switch (state.snakeDirection) {
    case 0:
        dmaCopy(&tilemapTiles[64], assets.gfx_head, 64);
        break;
    case 1:
        dmaCopy(&tilemapTiles[48], assets.gfx_head, 64);
        break;
    case 2:
        dmaCopy(&tilemapTiles[64], assets.gfx_head, 64);
        vflip = true;
        break;
    case 3:
        dmaCopy(&tilemapTiles[48], assets.gfx_head, 64);
        hflip = true;
        break;
    default:
        break;
    }

    oamSet(&oamSub, oamId, dot[0] * 8, dot[1] * 8, 0, 0, SpriteSize_8x8, SpriteColorFormat_256Color,
           assets.gfx_head, -1, false, false, hflip, vflip, false);
    oamId++;
}

void draw_snake_tail(const GameState &state, const RenderAssets &assets, uint16_t &oamId) {
    const std::array<int, 3> dot = state.snake.back();
    bool hflip = false;
    bool vflip = false;

    switch (state.snake.at(state.snake.size() - 2).at(2)) {
    case 0:
        dmaCopy(get_sprite_pointer(9 + ((state.snake.size() - 1) % 2)), assets.gfx_tail, 64);
        vflip = true;
        break;
    case 1:
        dmaCopy(get_sprite_pointer(7 + ((state.snake.size() - 1) % 2)), assets.gfx_tail, 64);
        hflip = true;
        break;
    case 2:
        dmaCopy(get_sprite_pointer(9 + ((state.snake.size() - 1) % 2)), assets.gfx_tail, 64);
        break;
    case 3:
        dmaCopy(get_sprite_pointer(7 + ((state.snake.size() - 1) % 2)), assets.gfx_tail, 64);
        break;
    default:
        break;
    }

    oamSet(&oamSub, oamId, dot[0] * 8, dot[1] * 8, 0, 0, SpriteSize_8x8, SpriteColorFormat_256Color,
           assets.gfx_tail, -1, false, false, hflip, vflip, false);
    oamId++;
}

void draw_snake(const GameState &state, const RenderAssets &assets, uint16_t &oamId) {
    draw_snake_head(state, assets, oamId);

    for (size_t i = 1; i < state.snake.size() - 1; i++) {
        oamSet(&oamSub, oamId, state.snake[i][0] * 8, state.snake[i][1] * 8, 0, 0, SpriteSize_8x8,
               SpriteColorFormat_256Color, (i % 2) ? assets.gfx_segment_small : assets.gfx_segment, -1,
               false, false, false, false, false);
        oamId++;
    }

    draw_snake_tail(state, assets, oamId);
}

void draw_apples(const GameState &state, const RenderAssets &assets, uint16_t &oamId) {
    for (const std::array<int, 2> &apple : state.apples) {
        oamSet(&oamSub, oamId, apple[0] * 8, apple[1] * 8, 0, 0, SpriteSize_8x8,
               SpriteColorFormat_256Color, assets.gfx_apple, -1, false, false, false, false, false);
        oamId++;
    }
}

void draw_apples_rotten(const GameState &state, const RenderAssets &assets, uint16_t &oamId) {
    for (const std::array<int, 2> &apple : state.bad_apples) {
        oamSet(&oamSub, oamId, apple[0] * 8, apple[1] * 8, 0, 0, SpriteSize_8x8,
               SpriteColorFormat_256Color, assets.gfx_apple_rotten, -1, false, false, false, false,
               false);
        oamId++;
    }
}

} // namespace

void draw_game(const GameState &state, const RenderAssets &assets) {
    uint16_t oamId = 0;

    if (!state.gameOver) {
        draw_apples(state, assets, oamId);
        draw_apples_rotten(state, assets, oamId);
        draw_snake(state, assets, oamId);
        return;
    }

    iprintf("\x1b[11;12HGAME OVER!");
    consoleSelect(assets.topScreen);
    iprintf("\x1b[10;13HGAME OVER!");
}

void draw_stats(const GameState &state, bool internals, bool musicEnabled, uint8_t frame) {
    if (internals) {
        iprintf("\x1b[0;0HFrame = %i\nTick = %i\ndir = %i", frame, state.ticks, state.snakeDirection);
        iprintf("\x1b[3;0HLength: %i", state.snakelength);
        iprintf("\x1b[4;0Hx=%i\ny=%i", state.snake.front()[0], state.snake.front()[1]);
    }

    iprintf("\x1b[10;12HScore: %i", state.score);

    if (!state.paused) {
        return;
    }

    if (musicEnabled) {
        iprintf("\x1b[23;0HX = Disable Music");
    } else {
        iprintf("\x1b[23;0HX = Enable Music ");
    }

    if (state.hardMode) {
        iprintf("\x1b[22;0HY = Restart in normal mode");
    } else {
        iprintf("\x1b[22;0HY = Restart in Hard mode");
    }
}

void blink_apples(const GameState &state, u16 *gfx_apple) {
    if (state.ticks % 4) {
        dmaCopy(get_sprite_pointer(5), gfx_apple, 64);
    } else {
        dmaCopy(get_sprite_pointer(6), gfx_apple, 64);
    }
}