// Board pinout and app settings for the Waveshare ESP32-C6-LCD-0.85.
// Pins come from Waveshare's schematic and demo code:
// https://github.com/waveshareteam/ESP32-C6-LCD-0.85
#pragma once

// ---------- Buttons (active LOW, external pull-ups on the board) ----------
// The board has only two GPIO buttons. The PWR key drives the power switch IC
// and is not readable from firmware.
#define PIN_BTN_PLUS   18   // "PLUS" key  -> Button 1: start recording
#define PIN_BTN_BOOT    9   // "BOOT" key  -> Button 2: stop recording
// Button 3 (transcribe + summarize) defaults to a long-press of PLUS.
// If you wire an external push button (to GND), set its GPIO here and it
// will also act as Button 3 on a single click. -1 = not fitted.
#define PIN_BTN_EXTRA  -1
#define BTN3_LONG_PRESS_MS 1000

// ---------- LCD: ST7735, 128x128, shares the SPI bus with the microSD ----------
#define PIN_SPI_SCK     1
#define PIN_SPI_MOSI    2
#define PIN_SPI_MISO   16
#define PIN_LCD_DC      3
#define PIN_LCD_CS      5
#define PIN_LCD_RST     4
#define PIN_LCD_BL      6
#define LCD_COL_OFFSET  2
#define LCD_ROW_OFFSET  3

// ---------- microSD ----------
#define PIN_SD_CS      17
#define SD_SPI_HZ      20000000

// ---------- LED ring: 8 x WS2812B ----------
#define PIN_LEDS       14
#define NUM_LEDS        8
#define LED_BRIGHTNESS 60     // 0-255; the ring is bright at close range
#define LED_COLOR_ORDER RGB   // per Waveshare's demo; use GRB if red and green look swapped

// ---------- Audio: ES7210 mic ADC on I2C + I2S ----------
#define PIN_I2C_SDA     8
#define PIN_I2C_SCL     7
#define PIN_I2S_MCLK   19
#define PIN_I2S_BCLK   20
#define PIN_I2S_WS     22
#define PIN_I2S_DIN    21     // ES7210 SDOUT1 -> ESP32
#define PIN_PA_CTRL    15     // NS4150 speaker amp enable (kept off)
#define ES7210_ADDR  0x40
#define MIC_GAIN_STEP  14     // ES7210 PGA: 0..10 = 0..30 dB in 3 dB steps, 11..14 = 33/34.5/36/37.5 dB (max)
#define DIGITAL_GAIN_DB 6     // extra software gain after the preamp, with a soft limiter (0 = off)

#define SAMPLE_RATE 16000     // 16 kHz mono 16-bit = 32 KB/s, ideal for speech-to-text

// Longest recording (also limited by free space on the card). 4 h = ~460 MB.
#define MAX_RECORD_SECONDS (4 * 3600)

// Transcription APIs reject files over 25 MB (~13 min), so long recordings are
// sent in parts of about STT_SEGMENT_SECONDS each. Every cut is moved to the
// quietest moment in the CUT_SEARCH_SECONDS before it, so words aren't split.
#define MAX_UPLOAD_BYTES    (25UL * 1024 * 1024)
#define STT_SEGMENT_SECONDS 600
#define CUT_SEARCH_SECONDS  15
#define STT_MAX_ATTEMPTS    3      // per part, before giving up (progress is kept for a later resume)

// ---------- Network ----------
// DNS servers used instead of the ones the router hands out ("" = keep the router's).
// Pinned because the board was once seen using 8.8.8.9, which doesn't answer DNS and
// added ~8 s to every connection.
#define DNS_PRIMARY   "8.8.8.8"
#define DNS_SECONDARY "1.1.1.1"

// ---------- Storage layout ----------
#define DIR_RECORDINGS "/recordings"
#define DIR_NOTES      "/notes"
#define LAST_REC_FILE  "/recordings/last.txt"