/**
 ****************************************************************************************************
 * @file        ui_home.c
 * @author      HiFi Player Project
 * @version     V1.3
 * @date        2026-01-01
 * @brief       主界面 —— iPhone 风格图标网格（应用启动器）
 *
 *   ┌──────────────────────────────────┐
 *   │  APP LAUNCHER              1/4   │  状态栏
 *   ├──────────────────────────────────┤
 *   │    ╭────╮   ╭────╮  ╭────╮  ╭────╮│
 *   │    │ ♪  │   │ 📁 │  │ ⚙  │  │ ☰  ││  图标（圆角渐变 + 字形）
 *   │    ╰────╯   ╰────╯  ╰────╯  ╰────╯│
 *   │    MUSIC    FILES   SETTINGS ABOUT │  名称
 *   │        WAV files in SD /MUSIC      │  选中项说明
 *   │              ● ○ ○                 │  页码圆点
 *   ├──────────────────────────────────┤
 *   │  [◀K1]   [▶K2]   [✔K3]   [→K0]    │  按键提示（Dock）
 *   └──────────────────────────────────┘
 *
 * 按键：
 *   K1 上一个图标    K2 下一个图标    K3 打开    K0 切换应用（全局）
 *
 * 图标不使用图片文件，而是「圆角渐变底 + LVGL 内置字形」，因此无需额外资源，
 * 新增应用时只要在 app.c 的表项里填 icon / color_from / color_to 即可。
 ****************************************************************************************************
 */

#include "ui_home.h"

#include <stdio.h>

#include "ui_common.h"
#include "app.h"

/* ---------------- 网格布局参数 ---------------- */
#define HOME_COLS       4                   /* 每页图标列数（iPhone 风格一排） */
#define HOME_MAX_PAGES  4                   /* 最多支持多少页 */

#define CELL_W          76
#define CELL_H          88
#define TILE_SIZE       68                  /* 图标方块尺寸 */
#define TILE_RADIUS     16                  /* 图标圆角（iOS 超级圆角观感） */
#define TILE_Y          0
#define NAME_DY         72                  /* 名称相对单元格顶部的偏移 */
#define GRID_Y          36                  /* 网格顶部 */
#define GRID_X          8                   /* 网格左侧起始 x */

#define DOTS_Y          150                 /* 页码圆点 y */
#define INFO_Y          132                 /* 选中项说明 y */

/* ---------------- 控件 ---------------- */
static lv_obj_t *s_scr        = NULL;
static lv_obj_t *s_lbl_index  = NULL;
static lv_obj_t *s_lbl_info   = NULL;
static lv_obj_t *s_dot[HOME_MAX_PAGES];

/* 每页的图标控件 */
static lv_obj_t *s_tile[HOME_COLS];
static lv_obj_t *s_glyph[HOME_COLS];
static lv_obj_t *s_name[HOME_COLS];

static ui_key_bar_t s_bar;
static ui_flash_t   s_flash;

/* ---------------- 缓存（避免无谓重绘） ---------------- */
static int s_page = -1;
static int s_sel  = -2;

/* ---------------- 按键提示（Dock） ---------------- */
static const char *const s_symbols[APP_KEY_NUM] = {
    LV_SYMBOL_RIGHT,        /* K0：切换应用 */
    LV_SYMBOL_LEFT,         /* K1：上一个图标 */
    LV_SYMBOL_RIGHT,        /* K2：下一个图标 */
    LV_SYMBOL_OK,           /* K3：打开 */
};

static const char *const s_captions[APP_KEY_NUM] = {
    "K0 SWITCH",
    "K1 PREV",
    "K2 NEXT",
    "K3 OPEN",
};

static const bool s_enabled[APP_KEY_NUM] = { true, true, true, true };

/* ---------------- 内部实现 ---------------- */

/**
 * @brief  设置图标方块的外观（渐变 / 选中环 / 未实现时变暗）
 */
static void style_tile(int slot, const app_entry_t *app, bool selected)
{
    lv_obj_t *tile = s_tile[slot];

    lv_obj_set_style_bg_color(tile, lv_color_hex(app->color_from), LV_PART_MAIN);
    lv_obj_set_style_bg_grad_color(tile, lv_color_hex(app->color_to), LV_PART_MAIN);
    lv_obj_set_style_bg_grad_dir(tile, LV_GRAD_DIR_VER, LV_PART_MAIN);
    lv_obj_set_style_bg_opa(tile, app->enabled ? LV_OPA_COVER : LV_OPA_50, LV_PART_MAIN);

    /* 选中：白色描边环 + 更强的投影（iOS 图标的“抬起”观感） */
    lv_obj_set_style_border_width(tile, selected ? 3 : 0, LV_PART_MAIN);
    lv_obj_set_style_border_color(tile, lv_color_hex(UI_COL_TEXT), LV_PART_MAIN);
    lv_obj_set_style_border_opa(tile, LV_OPA_COVER, LV_PART_MAIN);
    lv_obj_set_style_shadow_width(tile, selected ? 22 : 10, LV_PART_MAIN);
    lv_obj_set_style_shadow_color(tile, lv_color_hex(app->color_to), LV_PART_MAIN);
    lv_obj_set_style_shadow_opa(tile, selected ? LV_OPA_50 : LV_OPA_30, LV_PART_MAIN);
    lv_obj_set_style_shadow_ofs_y(tile, selected ? 6 : 3, LV_PART_MAIN);

    /* 字形 */
    lv_obj_set_style_text_color(s_glyph[slot],
                                lv_color_hex(app->enabled ? 0xFFFFFF : UI_COL_DIM), LV_PART_MAIN);

    /* 名称 */
    lv_obj_set_style_text_color(s_name[slot],
                                lv_color_hex(app->enabled ? (selected ? UI_COL_TEXT : UI_COL_SUB)
                                                          : UI_COL_DIM),
                                LV_PART_MAIN);
}

/**
 * @brief  刷新当前页的图标、页码与说明文字
 */
static void refresh(bool force)
{
    int count = 0;
    const app_entry_t *apps = app_get_entries(&count);
    int sel = app_get_selection();

    if (count <= 0)
    {
        sel = -1;
    }
    else if (sel >= count)
    {
        sel = count - 1;
    }

    int page = (sel < 0) ? 0 : (sel / HOME_COLS);

    if (!force && (page == s_page) && (sel == s_sel))
    {
        return;                             /* 无变化 */
    }

    s_page = page;
    s_sel  = sel;

    /* ---- 图标 ---- */
    for (int i = 0; i < HOME_COLS; i++)
    {
        int idx = page * HOME_COLS + i;

        if (idx < count)
        {
            const app_entry_t *app = &apps[idx];

            ui_label_set_if_changed(s_glyph[i], app->icon);
            ui_label_set_if_changed(s_name[i], app->title);
            style_tile(i, app, (idx == sel));

            lv_obj_clear_flag(s_tile[i], LV_OBJ_FLAG_HIDDEN);
            lv_obj_clear_flag(s_name[i], LV_OBJ_FLAG_HIDDEN);
        }
        else
        {
            lv_obj_add_flag(s_tile[i], LV_OBJ_FLAG_HIDDEN);
            lv_obj_add_flag(s_name[i], LV_OBJ_FLAG_HIDDEN);
        }
    }

    /* ---- 状态栏计数 ---- */
    char buffer[24];
    if ((count > 0) && (sel >= 0))
    {
        snprintf(buffer, sizeof(buffer), "%d/%d", sel + 1, count);
    }
    else
    {
        snprintf(buffer, sizeof(buffer), "--/--");
    }
    ui_label_set_if_changed(s_lbl_index, buffer);

    /* ---- 选中项说明 ---- */
    const char *info = "";
    if ((sel >= 0) && (apps[sel].subtitle != NULL))
    {
        info = apps[sel].subtitle;
    }
    ui_label_set_if_changed(s_lbl_info, info);

    /* ---- 页码圆点 ---- */
    int pages = (count + HOME_COLS - 1) / HOME_COLS;

    if (pages > HOME_MAX_PAGES)
    {
        pages = HOME_MAX_PAGES;
    }

    for (int i = 0; i < HOME_MAX_PAGES; i++)
    {
        if (i < pages)
        {
            lv_obj_clear_flag(s_dot[i], LV_OBJ_FLAG_HIDDEN);
            lv_obj_set_style_bg_opa(s_dot[i], (i == page) ? LV_OPA_COVER : LV_OPA_30, LV_PART_MAIN);
        }
        else
        {
            lv_obj_add_flag(s_dot[i], LV_OBJ_FLAG_HIDDEN);
        }
    }
}

/**
 * @brief  打开当前选中的应用
 */
static void open_selected(void)
{
    int count = 0;
    const app_entry_t *apps = app_get_entries(&count);
    int sel = app_get_selection();

    if ((sel < 0) || (sel >= count))
    {
        return;
    }

    if (!apps[sel].enabled || (apps[sel].mode >= APP_MODE_NUM))
    {
        return;                             /* 尚未实现的应用，忽略 */
    }

    app_set_mode(apps[sel].mode);
}

/* ---------------- 对外接口 ---------------- */

void ui_home_create(void)
{
    s_scr = lv_obj_create(NULL);
    ui_style_screen(s_scr);

    /* ---------------- 状态栏 ---------------- */
    lv_obj_t *header = ui_card(s_scr, 0, 0, UI_HOR_RES, 28, UI_COL_PANEL, 0);

    lv_obj_t *title = ui_label(header, LV_SYMBOL_LIST "  APP LAUNCHER",
                               &lv_font_montserrat_14, UI_COL_SUB);
    lv_obj_align(title, LV_ALIGN_LEFT_MID, 10, 0);

    s_lbl_index = ui_label(header, "--/--", &lv_font_montserrat_12, UI_COL_SUB);
    lv_obj_align(s_lbl_index, LV_ALIGN_RIGHT_MID, -10, 0);

    /* ---------------- 图标网格（一排，iOS 风格） ---------------- */
    for (int i = 0; i < HOME_COLS; i++)
    {
        lv_coord_t cell_x = (lv_coord_t)(GRID_X + i * CELL_W);

        /* 图标方块（直接挂在屏幕上，避免投影被容器裁掉） */
        s_tile[i] = ui_card(s_scr,
                            (lv_coord_t)(cell_x + (CELL_W - TILE_SIZE) / 2), GRID_Y,
                            TILE_SIZE, TILE_SIZE, UI_COL_CARD, TILE_RADIUS);

        /* 图标字形 */
        s_glyph[i] = ui_label(s_tile[i], "", &lv_font_montserrat_24, 0xFFFFFF);
        lv_obj_center(s_glyph[i]);

        /* 名称 */
        s_name[i] = ui_label(s_scr, "", &lv_font_montserrat_12, UI_COL_SUB);
        lv_obj_set_pos(s_name[i], cell_x, (lv_coord_t)(GRID_Y + NAME_DY));
        lv_obj_set_size(s_name[i], CELL_W, 14);
        lv_obj_set_style_text_align(s_name[i], LV_TEXT_ALIGN_CENTER, LV_PART_MAIN);
        lv_label_set_long_mode(s_name[i], LV_LABEL_LONG_DOT);
    }

    /* ---------------- 选中项说明 ---------------- */
    s_lbl_info = ui_label(s_scr, "", &lv_font_montserrat_12, UI_COL_DIM);
    lv_obj_set_pos(s_lbl_info, 0, INFO_Y);
    lv_obj_set_size(s_lbl_info, UI_HOR_RES, 14);
    lv_obj_set_style_text_align(s_lbl_info, LV_TEXT_ALIGN_CENTER, LV_PART_MAIN);
    lv_label_set_long_mode(s_lbl_info, LV_LABEL_LONG_DOT);

    /* ---------------- 页码圆点 ---------------- */
    for (int i = 0; i < HOME_MAX_PAGES; i++)
    {
        lv_obj_t *dot = lv_obj_create(s_scr);
        lv_obj_set_size(dot, 6, 6);
        lv_obj_clear_flag(dot, LV_OBJ_FLAG_SCROLLABLE | LV_OBJ_FLAG_CLICKABLE);
        lv_obj_set_style_radius(dot, LV_RADIUS_CIRCLE, LV_PART_MAIN);
        lv_obj_set_style_bg_color(dot, lv_color_hex(UI_COL_TEXT), LV_PART_MAIN);
        lv_obj_set_style_bg_opa(dot, LV_OPA_30, LV_PART_MAIN);
        lv_obj_set_style_border_width(dot, 0, LV_PART_MAIN);

        int total_w = HOME_MAX_PAGES * 6 + (HOME_MAX_PAGES - 1) * 8;
        lv_obj_set_pos(dot, (lv_coord_t)((UI_HOR_RES - total_w) / 2 + i * 14), DOTS_Y);
        lv_obj_add_flag(dot, LV_OBJ_FLAG_HIDDEN);

        s_dot[i] = dot;
    }

    /* ---------------- 底部按键提示（Dock） ---------------- */
    ui_key_bar_create(s_scr, &s_bar, s_symbols, s_captions, s_enabled);

    refresh(true);
}

void ui_home_show(void)
{
    s_sel    = -2;                          /* 强制刷新一次 */
    s_page   = -1;

    refresh(true);
    ui_key_bar_set_highlight(&s_bar, -1);
    lv_scr_load(s_scr);
}

void ui_home_tick(void)
{
    ui_key_bar_set_highlight(&s_bar, ui_flash_active(&s_flash));
    refresh(false);
}

void ui_home_flash(int key)
{
    ui_flash_trigger(&s_flash, key);
}

void ui_home_handle_key(uint8_t key)
{
    ui_flash_trigger(&s_flash, key);

    switch (key)
    {
        case APP_KEY_1:                     /* K1：上一个图标 */
            app_select_move(-1);
            break;

        case APP_KEY_2:                     /* K2：下一个图标 */
            app_select_move(+1);
            break;

        case APP_KEY_3:                     /* K3：打开选中的应用 */
            open_selected();
            break;

        default:
            break;
    }
}