// =====================================================================================
//  board_bringup.c  -  ESP32-P4 / ST7701 / GT911 Hardware-Bringup (JC4880P443C-I-W)
// =====================================================================================
//  BEWUSST eine .c-Datei (wird als C kompiliert): die esp_lcd-Init-Makros nutzen
//  Compound-Literals und Out-of-Order-Designated-Initializer, die in C++ (Arduino .cpp)
//  zu Fehlern fuehren. Der Ablauf ist 1:1 aus dem Hersteller-Beispiel
//  arduino_examples/lvgl_v9_sw_rotation/lvgl_sw_rotation.c uebernommen - lediglich der
//  Demo-Aufruf (lv_demo_widgets) entfaellt; das UI wird ueber display_hal.cpp aufgebaut.
//
//  Nur aktiv bei JC_USE_REAL_PANEL == 1. Erwartet die Vendor-BSP-Dateien im Sketch:
//    pins_config.h, lvgl_port_v9.h/.c, src/lcd/*, src/touch/*
// =====================================================================================

#include "config.h"        // liefert JC_USE_REAL_PANEL (C-sicher)

#if JC_USE_REAL_PANEL

#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "driver/ledc.h"
#include "driver/i2c_master.h"
#include "esp_log.h"
#include "esp_cache.h"
#include "esp_ldo_regulator.h"
#include "esp_lcd_panel_io.h"
#include "esp_lcd_panel_ops.h"
#include "esp_lcd_mipi_dsi.h"
#include "src/touch/esp_lcd_touch_gt911.h"
#include "src/lcd/esp_lcd_st7701.h"
#include "lvgl_port_v9.h"

#define BSP_MIPI_DSI_PHY_PWR_LDO_CHAN       (3)
#define BSP_MIPI_DSI_PHY_PWR_LDO_VOLTAGE_MV (2500)
#define BSP_LCD_H_RES                       (480)
#define BSP_LCD_V_RES                       (800)
#define BSP_I2C_NUM                         (I2C_NUM_1)
#define BSP_I2C_SDA                         (GPIO_NUM_7)
#define BSP_I2C_SCL                         (GPIO_NUM_8)
#define BSP_LCD_TOUCH_RST                   (GPIO_NUM_NC)
#define BSP_LCD_TOUCH_INT                   (GPIO_NUM_NC)
#define BSP_LCD_RST                         (GPIO_NUM_5)
#define BSP_LCD_BACKLIGHT                   GPIO_NUM_23
#define LCD_LEDC_CH                         LEDC_CHANNEL_0

static i2c_master_bus_handle_t s_i2c_handle = NULL;

void jc_backlight_init(void)
{
    const ledc_channel_config_t ch = {
        .gpio_num = BSP_LCD_BACKLIGHT,
        .speed_mode = LEDC_LOW_SPEED_MODE,
        .channel = LCD_LEDC_CH,
        .intr_type = LEDC_INTR_DISABLE,
        .timer_sel = 1,
        .duty = 0,
        .hpoint = 0
    };
    const ledc_timer_config_t tm = {
        .speed_mode = LEDC_LOW_SPEED_MODE,
        .duty_resolution = LEDC_TIMER_10_BIT,
        .timer_num = 1,
        .freq_hz = 5000,
        .clk_cfg = LEDC_AUTO_CLK
    };
    ledc_timer_config(&tm);
    ledc_channel_config(&ch);
}

void jc_backlight_set(int percent)
{
    if (percent > 100) percent = 100;
    if (percent < 0) percent = 0;
    uint32_t duty = (1023 * percent) / 100;
    ledc_set_duty(LEDC_LOW_SPEED_MODE, LCD_LEDC_CH, duty);
    ledc_update_duty(LEDC_LOW_SPEED_MODE, LCD_LEDC_CH);
}

IRAM_ATTR static bool on_vsync(esp_lcd_panel_handle_t panel,
                               esp_lcd_dpi_panel_event_data_t *edata, void *ctx)
{
    return lvgl_port_notify_lcd_vsync();
}

// Bringt Panel + Touch + LVGL-Port hoch (LVGL laeuft danach in eigenem Task).
void jc_board_bringup(void)
{
    jc_backlight_init();

    i2c_master_bus_config_t i2c_bus_conf = {
        .clk_source = I2C_CLK_SRC_DEFAULT,
        .sda_io_num = BSP_I2C_SDA,
        .scl_io_num = BSP_I2C_SCL,
        .i2c_port = BSP_I2C_NUM,
    };
    i2c_new_master_bus(&i2c_bus_conf, &s_i2c_handle);

    static esp_ldo_channel_handle_t phy_pwr_chan = NULL;
    esp_ldo_channel_config_t ldo_cfg = {
        .chan_id = BSP_MIPI_DSI_PHY_PWR_LDO_CHAN,
        .voltage_mv = BSP_MIPI_DSI_PHY_PWR_LDO_VOLTAGE_MV,
    };
    esp_ldo_acquire_channel(&ldo_cfg, &phy_pwr_chan);

    esp_lcd_dsi_bus_handle_t mipi_dsi_bus;
    esp_lcd_dsi_bus_config_t bus_config = ST7701_PANEL_BUS_DSI_2CH_CONFIG();
    esp_lcd_new_dsi_bus(&bus_config, &mipi_dsi_bus);

    esp_lcd_panel_io_handle_t io = NULL;
    esp_lcd_dbi_io_config_t dbi_config = ST7701_PANEL_IO_DBI_CONFIG();
    esp_lcd_new_panel_io_dbi(mipi_dsi_bus, &dbi_config, &io);

    esp_lcd_panel_handle_t disp_panel = NULL;
    esp_lcd_dpi_panel_config_t dpi_config = ST7701_480_360_PANEL_60HZ_DPI_CONFIG(LCD_COLOR_PIXEL_FORMAT_RGB565);
    dpi_config.num_fbs = LVGL_PORT_LCD_BUFFER_NUMS;

    st7701_vendor_config_t vendor_config = {
        .mipi_config = {
            .dsi_bus = mipi_dsi_bus,
            .dpi_config = &dpi_config,
        },
        .flags = {
            .use_mipi_interface = 1,
        },
    };
    esp_lcd_panel_dev_config_t lcd_dev_config = {
        .bits_per_pixel = 16,
        .rgb_ele_order = ESP_LCD_COLOR_SPACE_RGB,
        .reset_gpio_num = BSP_LCD_RST,
        .vendor_config = &vendor_config,
    };
    esp_lcd_new_panel_st7701(io, &lcd_dev_config, &disp_panel);
    esp_lcd_panel_reset(disp_panel);
    esp_lcd_panel_init(disp_panel);

    // Alle Framebuffer einmal auf Schwarz loeschen. Im Avoid-Tear-Direct-Mode (mehrere
    // Buffer) kopiert LVGL pro Frame nur die geaenderten Bereiche in den naechsten Buffer;
    // bis alle Buffer einmal vollstaendig bemalt sind, wuerde sonst uninitialisierter
    // Speicher (weisses Rauschen) durchblitzen. Schwarz faellt gegen das dunkle Theme
    // nicht auf. Cache-Writeback noetig, da die Buffer im PSRAM liegen und der DMA liest.
    {
        void *fbs[3] = { NULL, NULL, NULL };
        size_t fb_size = (size_t)BSP_LCD_H_RES * BSP_LCD_V_RES * 2;  // RGB565 = 2 Byte/Pixel
#if LVGL_PORT_LCD_BUFFER_NUMS >= 3
        esp_lcd_dpi_panel_get_frame_buffer(disp_panel, 3, &fbs[0], &fbs[1], &fbs[2]);
#elif LVGL_PORT_LCD_BUFFER_NUMS == 2
        esp_lcd_dpi_panel_get_frame_buffer(disp_panel, 2, &fbs[0], &fbs[1]);
#else
        esp_lcd_dpi_panel_get_frame_buffer(disp_panel, 1, &fbs[0]);
#endif
        for (int i = 0; i < 3; i++) {
            if (fbs[i]) {
                memset(fbs[i], 0, fb_size);
                esp_cache_msync(fbs[i], fb_size, ESP_CACHE_MSYNC_FLAG_DIR_C2M);
            }
        }
    }

    esp_lcd_dpi_panel_event_callbacks_t cbs = {
#if LVGL_PORT_AVOID_TEAR_MODE
        .on_refresh_done = on_vsync,
#else
        .on_color_trans_done = on_vsync,
#endif
    };
    esp_lcd_dpi_panel_register_event_callbacks(disp_panel, &cbs, NULL);

    esp_lcd_panel_io_handle_t tp_io_handle = NULL;
    esp_lcd_touch_handle_t tp_handle;
    esp_lcd_panel_io_i2c_config_t tp_io_config = ESP_LCD_TOUCH_IO_I2C_GT911_CONFIG();
    tp_io_config.scl_speed_hz = 100000;
    esp_lcd_new_panel_io_i2c(s_i2c_handle, &tp_io_config, &tp_io_handle);
    const esp_lcd_touch_config_t tp_cfg = {
        .x_max = BSP_LCD_H_RES,
        .y_max = BSP_LCD_V_RES,
        .rst_gpio_num = BSP_LCD_TOUCH_RST,
        .int_gpio_num = BSP_LCD_TOUCH_INT,
        .levels = {
            .reset = 0,
            .interrupt = 0,
        },
        .flags = {
            .swap_xy = 0,
            .mirror_x = 0,
            .mirror_y = 0,
        },
    };
    esp_lcd_touch_new_i2c_gt911(tp_io_handle, &tp_cfg, &tp_handle);

    lvgl_port_interface_t interface =
        (dpi_config.flags.use_dma2d) ? LVGL_PORT_INTERFACE_MIPI_DSI_DMA
                                     : LVGL_PORT_INTERFACE_MIPI_DSI_NO_DMA;
    lvgl_port_init(disp_panel, tp_handle, interface);
}

#endif // JC_USE_REAL_PANEL