#pragma once
// VersaPad v2 – Logical pin names
// All Arduino pin numbers reference the custom variant (variants/versapad/variant.h)

// ─── Button Matrix ────────────────────────────────────────────────────────────
// Layout (viewed from front):
//
//         COL_0  COL_1  COL_2  COL_3  COL_4
//  ROW_0  [ENC3]  [  ]   [  ]   [  ]   [  ]
//  ROW_1  [ENC2]  [  ]   [  ]   [  ]   [  ]
//  ROW_2  [ENC1]  [  ]   [  ]   [  ]   [  ]
//  ROW_3  [ENC0]  [  ]   [  ]   [  ]   [  ]
//  ROW_4   ---    [  ]   [  ]   [  ]   [  ]
//
// COL_0 × ROW_0–3 = encoder push buttons
// COL_1–4 × ROW_0–4 = 20 Cherry MX buttons
// COL_0 × ROW_4 = not connected

#define BTN_COL_COUNT  5
#define BTN_ROW_COUNT  5

// Column pins: driven OUTPUT LOW during scan, otherwise INPUT (high-Z or HIGH)
static const uint8_t BTN_COLS[BTN_COL_COUNT] = {
    PIN_COL0,   // PB10  – encoder SW column
    PIN_COL1,   // PA11  – Cherry MX col 1 (leftmost)
    PIN_COL2,   // PA10  – Cherry MX col 2
    PIN_COL3,   // PA09  – Cherry MX col 3
    PIN_COL4,   // PA08  – Cherry MX col 4 (rightmost)
};

// Row pins: INPUT_PULLUP, read LOW when button pressed
static const uint8_t BTN_ROWS[BTN_ROW_COUNT] = {
    PIN_ROW0,   // PB11
    PIN_ROW1,   // PA12
    PIN_ROW2,   // PA13
    PIN_ROW3,   // PA14
    PIN_ROW4,   // PA15
};

// Button index helper: col * ROW_COUNT + row  →  0..24
#define BTN_INDEX(col, row)  ((col) * BTN_ROW_COUNT + (row))

// Encoder SW buttons are at column 0
#define BTN_ENC_SW(enc)  BTN_INDEX(0, (enc))   // enc = 0..3

// ─── Rotary Encoders ──────────────────────────────────────────────────────────
// ENC0 = closest to USB connector, ENC3 = furthest

static const uint8_t ENC_A[4] = { PIN_ENC0_A, PIN_ENC1_A, PIN_ENC2_A, PIN_ENC3_A };
static const uint8_t ENC_B[4] = { PIN_ENC0_B, PIN_ENC1_B, PIN_ENC2_B, PIN_ENC3_B };

// ─── WS2812 LEDs ─────────────────────────────────────────────────────────────
#define LED_COUNT     20
#define LED_DATA_PIN  PIN_SPI_MOSI   // PB22, SERCOM5 PAD2

// LED index: serpentine (even rows L→R, odd rows R→L)
// Row 0: 0,1,2,3   Row 1: 7,6,5,4   Row 2: 8,9,10,11   Row 3: 15,14,13,12   Row 4: 16,17,18,19
#define LED_COLS  (BTN_COL_COUNT - 1)   // 4 Cherry MX columns
#define LED_INDEX(col, row) \
    ((row) * LED_COLS + (((row) & 1) ? (LED_COLS - (col)) : ((col) - 1)))

// ─── Faders (ADC) ─────────────────────────────────────────────────────────────
#define FADER_COUNT  3
static const uint8_t FADER_PINS[FADER_COUNT] = {
    PIN_FADER0,   // PA02  A0
    PIN_FADER1,   // PA03  A1  (also VREFA – analog only, no digitalRead)
    PIN_FADER2,   // PB08  A2
};