/*
 * Amirine Cosplay Lights
 *
 * Plays lightshows defined in shows.h on a WS2812B LED strip.
 * A single button navigates between shows:
 *   1 tap  — next show
 *   2 taps — previous show
 *   3 taps — lights off (any tap or hold resumes)
 *   hold   — reset to show 0 (blue breath)
 *
 * To add or update shows:
 *   1. Add or edit a .txt file in converter/shows/
 *   2. Run:   make shows
 *   3. Run:   make upload
 *
 * Required libraries: FastLED, OneButton  (Sketch > Include Library > Manage Libraries)
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <OneButton.h>
#include "config.h"
#include "led_controller.h"
#include "shows.h"

// ---- Playback state ----------------------------------------------------

static uint8_t  s_show_index  = 0;
static ShowDef  s_show;                       // PROGMEM cache for the active show
static uint16_t s_step_index  = 0;
static uint32_t s_step_start  = 0;
static CRGB     s_from_color  = CRGB::Black;
static bool     s_lights_off  = false;

static void load_show(uint8_t index) {
    s_lights_off = false;
    s_show_index = index;
    s_show       = read_show_def(&SHOWS[index]);
    s_step_index = 0;
    s_step_start = millis();
    s_from_color = CRGB::Black;
}

// How far through the current step we are (0–255).
// Returns 255 immediately for instant steps (duration_ms == 0).
static uint8_t step_progress(const Step& step, uint32_t now) {
    if (step.duration_ms == 0) return 255;
    uint32_t elapsed = now - s_step_start;
    if (elapsed >= step.duration_ms) return 255;
    return (uint8_t)((elapsed * 255UL) / step.duration_ms);
}

// Complete the current step and advance to the next.
// SHOW_LOOP wraps back to step 0; SHOW_SINGLE loads the next show when the last step ends.
static void advance_step(CRGB reached_color, uint32_t now) {
    s_from_color = reached_color;
    uint16_t next = s_step_index + 1;
    if (next >= s_show.length) {
        if (s_show.mode == SHOW_SINGLE) {
            load_show((s_show_index + 1) % SHOW_COUNT);
            return;
        }
        next = 0;
    }
    s_step_index = next;
    s_step_start = now;
}

// ---- Button ------------------------------------------------------------

static OneButton s_button(BUTTON_PIN, true, true);  // active-low, enable pullup

// ---- Arduino entry points ----------------------------------------------

void setup() {
    leds_begin();
    load_show(0);

    s_button.setClickMs(400);
    s_button.setPressMs(800);
    s_button.attachClick([]()          { load_show((s_show_index + 1) % SHOW_COUNT); });
    s_button.attachDoubleClick([]()    { load_show((s_show_index + SHOW_COUNT - 1) % SHOW_COUNT); });
    s_button.attachMultiClick([]()     { if (s_button.getNumberClicks() == 3) { s_lights_off = true; leds_apply_color(CRGB::Black); leds_show(); } });
    s_button.attachLongPressStart([]() { load_show(0); });
}

void loop() {
    s_button.tick();

    static uint32_t s_last_frame = 0;
    uint32_t now = millis();
    if (now - s_last_frame < 16) return;
    s_last_frame = now;

    if (s_lights_off) return;

    Step    step = read_step(&s_show.steps[s_step_index]);
    CRGB    to   = CRGB(step.r, step.g, step.b);
    uint8_t t8   = step_progress(step, now);

    leds_apply_color(blend(s_from_color, to, t8));
    leds_show();

    if (t8 == 255) advance_step(to, now);
}