/*
Copyright (c) 2023 Bad Diode

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE.
*/

// TODO: A list of features I would like to get to implement in the near future.
//
// UI tweaks.
//  + Add new UI for the parameter pages
//  + Change cursor drawing for new parameter pages
//  + Change cursor behaviour for new parameter pages
//  - Display notification when editing a parameter with the highest priority
//  - Add panning support.
//  - Allow prob control (% based or 1:2, etc.)
//  - Add custom user themes
//  - Animations for cursor movement/current step highlight. (A fade out maybe?)
//
// Quality of life improvements.
//  + Make the channel parameters initialize to default
//  - When not on play mode, adjusting a note or a parameter triggers the sound.
//    This could get annoying, so maybe it should be a configuration option to
//    enable it?
//  - Undo/Redo.
//
//  Advanced
//  - Per trig note probability.
//  - Add tap tempo for BPM.
//  - Allow "marking" several trigs to be able to copy/paste them and/or adjust
//    their parameters.
//  - Add an envelope to ch3, would need to work with a timer in order to make
//    it work I think.
//  - Sync via MIDI via arduinoboy or something similar.
//
//  Bugfixes
//  - Sound can get hung up sometimes, but I can't reproduce when this happens.
//    Not sure if this is an emulator thing or happens also in hardware.
//  - Cursor can stay in position instead of dissapering, again I can't
//    reproduce this right now, just happened randomly. Needs investigation.
//

#include "gba/gba.h"

#include "renderer_m0.c"
#include "globals.c"
#include "settings.c"
#include "dsound.c"
#include "sequencer.c"

#define PROF_ENABLE 0
#include "profiling.c"

void
render_sequencer(void) {
    PROF(draw_rect(0, 0, SCREEN_WIDTH - 1, SCREEN_HEIGHT - 1, 1), clear_cycles);
    if (redraw_trigs) {
        PROF(draw_triggers(), draw_trigs_cycles);
        redraw_trigs = false;
    }
    if (redraw_channels) {
        PROF(draw_channels(), draw_btn_cycles);
        redraw_channels = false;
    }
    if (redraw_pattern_buttons) {
        PROF(draw_pattern_buttons(), draw_btn_cycles);
        redraw_pattern_buttons = false;
    }
    if (redraw_bank_buttons) {
        PROF(draw_bank_buttons(), draw_btn_cycles);
        redraw_bank_buttons = false;
    }
    if (redraw_bpm) {
        PROF(draw_bpm(), draw_btn_cycles);
        redraw_bpm = false;
    }
    if (redraw_play_pause) {
        PROF(draw_play(), draw_btn_cycles);
        PROF(draw_stop(), draw_btn_cycles);
        redraw_play_pause = false;
    }
    if (redraw_piano_note) {
        PROF(draw_piano_notes(), draw_piano_cycles);
        redraw_piano_note = false;
    }
    if (redraw_params) {
        PROF(draw_parameters(), draw_param_cycles);
        redraw_params = false;
    }

    if (input_handler == handle_pattern_selection ||
            input_handler == handle_pattern_chain) {
        draw_pattern_chain();
    }

    // TODO: redraw_notif?
    draw_notif_bar();
    PROF(draw_cursors(), draw_cursor_cycles);
}

void
render_settings(void) {
    PROF(draw_rect(0, 0, SCREEN_WIDTH - 1, SCREEN_HEIGHT - 1, 1), clear_cycles);
    txt_drawf_small("settings", 11, 5, COL_FG)
    txt_printf("\n\n\n");
    txt_printf("  SYNC:   %s\n\n", sync_setting_str[settings.sync]);
    txt_printf("  THEME:  %s\n\n", theme_setting_str[settings.theme]);
    txt_printf("  CURSOR: %s\n\n", cursor_setting_str[settings.cursor]);
    txt_printf("  HELP:   %s\n\n", help_setting_str[settings.help]);
    txt_render();
    txt_clear();
    PROF(draw_settings_cursor(), draw_cursor_cycles);
}

void
render(void) {
    if (clear_screen) {
        PROF(screen_fill(COL_BG), clear_cycles);
        clear_screen = false;
    }
    switch (scene) {
        case SCENE_SETTINGS: {
            render_settings();
        } break;
        case SCENE_SEQUENCER: {
            render_sequencer();
        } break;
    }
}

void
handle_input(void) {
    switch (scene) {
        case SCENE_SETTINGS: {
            handle_settings_input();
        } break;
        case SCENE_SEQUENCER: {
            handle_sequencer_input();
        } break;
    }
}

void
update(void) {
    if (next_scene != scene) {
        scene = next_scene;
        clear_screen = true;
        redraw_trigs = true;
        redraw_channels = true;
        redraw_pattern_buttons = true;
        redraw_bank_buttons = true;
        redraw_bpm = true;
        redraw_play_pause = true;
        redraw_piano_note = true;
        redraw_params = true;
    }
    last_trig_loc = trig_selection_loc;
    last_channel_loc = channel_selection_loc;
    last_pattern_loc = pattern_selection_loc;
    last_right_col_loc = right_col_selection_loc;
    if (update_bpm) {
        set_time(patterns[current_pattern].bpm);
        update_bpm = false;
    }
    if (audio_sync_click) {
        play_click();
    }
    if (notif.time > 0) {
        notif.time--;
    }
}

int
main(void) {
    // Adjust system wait times.
    SYSTEM_WAIT = SYSTEM_WAIT_CARTRIDGE;

    // Initialize renderer.
    renderer_init();

    // Register interrupts.
    irq_init();
    irs_set(IRQ_VBLANK, sound_vsync);

    // Initialize sequencer.
    sequencer_init();
    txt_spacing(6);

    // Main loop.
    while (true) {
        poll_keys();
        bios_vblank_wait();
        PROF_SHOW();
        FRAME_START();
        PROF(flip_buffer(), flip_cycles);
        PROF(update(), update_cycles);
        PROF(handle_input(), input_cycles);
        PROF(render(), render_cycles);
        FRAME_END();
    }

    return 0;
}