/* app/settings.c — 全局设置页（C，书架顶栏「设置」入口 → 独立页 ACT_SETTINGS）。
 *
 * 配置项（MVP，见 READER_UI_DESIGN §4.3）：默认字号/默认行距/默认背景(黑白米黄)/主题(亮暗跟随
 * 全局)/书架布局(list-grid)/页头条/页底条。全部存 App 私有 reader.conf（rdconf），不进系统
 * settings.conf。UI：meow_topappbar(返回+标题) + meow_listview 行（每行 label + 当前值尾部箭头，
 * 点行开 meow_dialog(SELECT) 单选；值即改即存）。
 */
#include "../reader_internal.h"
#include "progress.h"
#include "reader_conf.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define SET_X 0
#define SET_W 480
#define SET_APPBAR_H 56

static meow_widget *g_appbar;
static meow_widget *g_list;
static int g_active;

/* 行项枚举（顺序 = 列表顺序） */
enum { ITEM_FS = 0, ITEM_LS, ITEM_BG, ITEM_THEME, ITEM_SHELF, ITEM_HDR, ITEM_FTR, ITEM_COUNT };
static const char *const g_labels[ITEM_COUNT] = {
    "默认字号", "默认行距", "默认背景", "主题", "书架布局", "页头条", "页底条"
};
static void settings_redraw(void);

static const char *bg_label(const rdconf *c)
{
    if (!c) return "黑";
    if (!strcmp(c->bg, "white")) return "白";
    if (!strcmp(c->bg, "sepia")) return "米黄";
    if (!strcmp(c->bg, "auto")) return "自动";
    return "黑";
}
static const char *theme_label(const rdconf *c)
{
    if (!c) return "跟随系统";
    if (!strcmp(c->theme, "light")) return "日";
    if (!strcmp(c->theme, "dark")) return "夜";
    return "跟随系统";
}
static const char *shelf_label(const rdconf *c)
{
    if (!c) return "列表";
    return (!strcmp(c->shelf, "grid")) ? "宫格" : "列表";
}

/* 当前行值（subtitle）。 */
static void item_value(int item, char *out, int outsz)
{
    const rdconf *c = rdconf_get();
    if (!c) { snprintf(out, (size_t)outsz, "-"); return; }
    switch (item) {
        case ITEM_FS:    snprintf(out, (size_t)outsz, "%d", c->fs); break;
        case ITEM_LS:    snprintf(out, (size_t)outsz, "%d", c->ls); break;
        case ITEM_BG:    snprintf(out, (size_t)outsz, "%s", bg_label(c)); break;
        case ITEM_THEME: snprintf(out, (size_t)outsz, "%s", theme_label(c)); break;
        case ITEM_SHELF: snprintf(out, (size_t)outsz, "%s", shelf_label(c)); break;
        case ITEM_HDR:   snprintf(out, (size_t)outsz, "%s", c->header ? "显示" : "隐藏"); break;
        case ITEM_FTR:   snprintf(out, (size_t)outsz, "%s", c->footer ? "显示" : "隐藏"); break;
        default: snprintf(out, (size_t)outsz, "-"); break;
    }
}

/* ---- listview 行源（src2：每次绘制读最新 rdconf 值） ---- */
static int settings_src(int idx, meow_list_item *out, void *ctx)
{
    (void)ctx;
    if (idx < 0 || idx >= ITEM_COUNT) return 0;
    static char valbuf[16];
    item_value(idx, valbuf, sizeof valbuf);
    out->icon_kind = MEOW_LIST_ICON_NONE;
    out->title = g_labels[idx];
    out->subtitle = valbuf;
    out->right = MEOW_LIST_RIGHT_ARROW;
    out->on = 0;
    out->enabled = 1;
    return 1;
}

/* 由当前值求 SELECT 对话框的选中下标。 */
static int idx_for(int item, const char *const *opts, int n, const rdconf *c)
{
    if (item == ITEM_FS) { for (int i = 0; i < n; i++) if (atoi(opts[i]) == c->fs) return i; return 0; }
    if (item == ITEM_LS) { for (int i = 0; i < n; i++) if (atoi(opts[i]) == c->ls) return i; return 0; }
    if (item == ITEM_BG) {
        for (int i = 0; i < n; i++) if (!strcmp(opts[i], bg_label(c))) return i;
        return 0;
    }
    if (item == ITEM_THEME) {
        for (int i = 0; i < n; i++) if (!strcmp(opts[i], theme_label(c))) return i;
        return 0;
    }
    if (item == ITEM_SHELF) {
        for (int i = 0; i < n; i++) if (!strcmp(opts[i], shelf_label(c))) return i;
        return 0;
    }
    if (item == ITEM_HDR) return c->header ? 0 : 1;
    if (item == ITEM_FTR) return c->footer ? 0 : 1;
    return 0;
}

/* 选完整数数组项（字号/行距）；写回 rdconf。 */
static void apply_fs_ls(int item, const char *sel)
{
    rdconf *c = rdconf_get();
    if (!c) return;
    int v = atoi(sel);
    if (item == ITEM_FS) { if (v >= 14 && v <= 40) c->fs = v; }
    else if (item == ITEM_LS) { if (v >= 100 && v <= 200) c->ls = v; }
    rdconf_persist();
}

static void apply_choice(int item, int sel)
{
    rdconf *c = rdconf_get();
    if (!c) return;
    switch (item) {
        case ITEM_BG:
            if (sel < 0) sel = 0;
            if (sel > 3) sel = 3;
            if (sel == 0) strcpy(c->bg, "black");
            else if (sel == 1) strcpy(c->bg, "white");
            else if (sel == 2) strcpy(c->bg, "sepia");
            else strcpy(c->bg, "auto");
            break;
        case ITEM_THEME:
            if (sel < 0) sel = 0;
            if (sel > 2) sel = 2;
            if (sel == 0) strcpy(c->theme, "auto");
            else if (sel == 1) strcpy(c->theme, "light");
            else strcpy(c->theme, "dark");
            break;
        case ITEM_SHELF:
            shelf_set_view(sel ? 1 : 0);   /* 写 rdconf + 重建书架 */
            return;
        case ITEM_HDR: c->header = sel ? 0 : 1; break;   /* 0 显示 1 隐藏 */
        case ITEM_FTR: c->footer = sel ? 0 : 1; break;
        default: return;
    }
    rdconf_persist();
}

/* 打开一个 SELECT 对话框并应用。 */
static void settings_open_choice(int item)
{
    const rdconf *c = rdconf_get();
    if (!c) return;
    const char *title = g_labels[item];
    meow_dialog *d = meow_dialog_create(MEOW_DLG_SELECT, title);
    if (!d) return;
    const char *opts[16]; int n = 0; int cur = 0;
    static char numopts[16][8];
    if (item == ITEM_FS) {
        for (int v = 14; v <= 40; v += 2) { snprintf(numopts[n], sizeof numopts[n], "%d", v); opts[n] = numopts[n]; n++; }
    } else if (item == ITEM_LS) {
        for (int v = 100; v <= 200; v += 10) { snprintf(numopts[n], sizeof numopts[n], "%d", v); opts[n] = numopts[n]; n++; }
    } else if (item == ITEM_BG) {
        static const char *b[4] = { "黑", "白", "米黄", "自动" };
        for (int i = 0; i < 4; i++) opts[n++] = b[i];
    } else if (item == ITEM_THEME) {
        static const char *t[3] = { "跟随系统", "日", "夜" };
        for (int i = 0; i < 3; i++) opts[n++] = t[i];
    } else if (item == ITEM_SHELF) {
        static const char *s[2] = { "列表", "宫格" };
        for (int i = 0; i < 2; i++) opts[n++] = s[i];
    } else if (item == ITEM_HDR || item == ITEM_FTR) {
        static const char *h[2] = { "显示", "隐藏" };
        for (int i = 0; i < 2; i++) opts[n++] = h[i];
    }
    cur = idx_for(item, opts, n, c);
    meow_dialog_set_items(d, opts, n, cur);
    meow_dialog_show(d);
    int res = meow_dialog_result(d);
    meow_dialog_free(d);
    if (res < 0 || res >= n) return;      /* 取消 */
    if (item == ITEM_FS || item == ITEM_LS) apply_fs_ls(item, opts[res]);
    else apply_choice(item, res);
    settings_redraw();
}

static void settings_redraw(void)
{
    const meow_theme *th = meow_theme_get();
    meow_ui_clear(th->bg);
    if (g_appbar) meow_widget_draw(g_appbar);
    if (g_list) meow_widget_draw(g_list);
    meow_ui_flush();
}

/* view 生命周期 */
static void settings_on_create(meow_view *v, void *ctx) { (void)v; (void)ctx; }
static void settings_on_enter(meow_view *v, void *ctx)
{
    (void)v; (void)ctx;
    g_active = 1;
    int sbh = meow_ui_statusbar_height();
    if (g_appbar) { meow_widget_free(g_appbar); g_appbar = NULL; }
    g_appbar = meow_topappbar_create(0, sbh, 480, SET_APPBAR_H, "阅读设置");
    if (g_appbar) meow_topappbar_set_back(g_appbar, 1);
    if (g_list) { meow_widget_free(g_list); g_list = NULL; }
    int ly = sbh + SET_APPBAR_H + 8;
    g_list = meow_listview_create(SET_X, ly, SET_W, 720 - ly, ITEM_COUNT,
                                  settings_src, NULL, MEOW_LIST_SEL_SINGLE);
    if (g_list) {
        meow_listview_set_container(g_list, 1);
        meow_listview_set_item_tier(g_list, 2);
    }
    settings_redraw();
}
static void settings_on_leave(meow_view *v, void *ctx) { (void)v; (void)ctx; g_active = 0; }
static void settings_on_destroy(meow_view *v, void *ctx)
{
    (void)v; (void)ctx;
    if (g_list) { meow_widget_free(g_list); g_list = NULL; }
    if (g_appbar) { meow_widget_free(g_appbar); g_appbar = NULL; }
}

meow_view *settings_view_create(void)
{
    static meow_view_hooks hooks = { settings_on_create, settings_on_enter, settings_on_leave,
                                     settings_on_destroy, NULL, NULL, NULL };
    return meow_view_create(ACT_SETTINGS, MEOW_VIEW_ACTIVITY, &hooks, NULL);
}

int settings_is_active(void) { return g_active; }

void settings_reload(void) { if (g_active) settings_redraw(); }

int settings_on_tap(int x, int y)
{
    /* 顶栏返回 */
    if (g_appbar) {
        int bi = meow_topappbar_hit(g_appbar, x, y);
        if (bi == MEOW_TOPBAR_BACK) { meow_view_page_pop(); return 1; }
        if (bi >= 0) return 1;
    }
    if (g_list) {
        int idx = meow_listview_tap_at(g_list, x, y);
        if (idx >= 0 && idx < ITEM_COUNT) {
            settings_open_choice(idx);
            return 1;
        }
        if (idx >= 0) { settings_redraw(); return 1; }
    }
    return 0;
}