/*
 * meow_ui_widget.c — 控件层（B1.3）：按钮/滑条/开关/列表最小集。
 *
 * 控件只负责绘制与状态；命中分发由应用在 on_tap 里调 meow_widget_hit 完成
 * （与 MEOW_APP_SDK.md §5 一致）。绘制读当前主题（meow_theme_get）走 back_buf。
 */
#include "meow_ui.h"
#include "meow_ui_internal.h"
#include <stdlib.h>
#include <string.h>

enum { W_BTN = 0, W_SLIDER = 1, W_SWITCH = 2, W_LIST = 3 };

struct meow_widget {
    int type;
    int x, y, w, h;
    char label[128];
    int pressed;            /* 按钮按下视觉态 */
    int min, max, val;      /* 滑条 */
    int on;                 /* 开关 */
    int count, sel;         /* 列表 */
    meow_list_source src;
    void *ctx;
};

meow_widget *meow_btn_create(int x, int y, int w, int h, const char *label)
{
    meow_widget *t = (meow_widget *)calloc(1, sizeof *t);
    if (!t) return NULL;
    t->type = W_BTN; t->x = x; t->y = y; t->w = w; t->h = h;
    if (label) { strncpy(t->label, label, sizeof t->label - 1); t->label[sizeof t->label - 1] = 0; }
    return t;
}

meow_widget *meow_slider_create(int x, int y, int w, int min, int max, int val)
{
    meow_widget *t = (meow_widget *)calloc(1, sizeof *t);
    if (!t) return NULL;
    t->type = W_SLIDER; t->x = x; t->y = y; t->w = w; t->h = 40;
    t->min = min; t->max = (max > min) ? max : min + 1; t->val = (val < min) ? min : (val > t->max) ? t->max : val;
    return t;
}

meow_widget *meow_switch_create(int x, int y, int on)
{
    meow_widget *t = (meow_widget *)calloc(1, sizeof *t);
    if (!t) return NULL;
    t->type = W_SWITCH; t->x = x; t->y = y; t->w = 56; t->h = 32;
    t->on = on ? 1 : 0;
    return t;
}

meow_widget *meow_list_create(int x, int y, int w, int h, int count,
                              meow_list_source src, void *ctx)
{
    meow_widget *t = (meow_widget *)calloc(1, sizeof *t);
    if (!t) return NULL;
    t->type = W_LIST; t->x = x; t->y = y; t->w = w; t->h = h;
    t->count = count; t->src = src; t->ctx = ctx; t->sel = 0;
    return t;
}

void meow_widget_free(meow_widget *w) { if (w) free(w); }

static int hit(meow_widget *w, int x, int y)
{
    if (!w) return 0;
    return x >= w->x && x < w->x + w->w && y >= w->y && y < w->y + w->h;
}

int meow_widget_hit(meow_widget *w, int x, int y) { return hit(w, x, y); }
int  meow_btn_pressed(meow_widget *w) { return w && w->type == W_BTN ? w->pressed : 0; }

void meow_slider_set(meow_widget *w, int val)
{
    if (!w || w->type != W_SLIDER) return;
    if (val < w->min) val = w->min; if (val > w->max) val = w->max;
    w->val = val;
}
int meow_slider_get(meow_widget *w) { return w && w->type == W_SLIDER ? w->val : 0; }
void meow_switch_set(meow_widget *w, int on)
{ if (w && w->type == W_SWITCH) w->on = on ? 1 : 0; }
int  meow_switch_get(meow_widget *w) { return w && w->type == W_SWITCH ? w->on : 0; }

/* 供应用在 on_tap 里对外可控回馈：这里不存命中态（由 app 分发），仅暴露绘制 */
void meow_widget_draw(meow_widget *w)
{
    if (!w) return;
    const meow_theme *th = meow_theme_get();
    switch (w->type) {
    case W_BTN: {
        uint32_t bg = w->pressed ? th->dim : th->accent;
        meow_gfx_fill_round(w->x, w->y, w->w, w->h, 10, bg);
        meow_ui_text_center(w->x + w->w / 2, w->y + (w->h - meow_ui_text_height(th->font_body)) / 2,
                            w->label, th->font_body, 0xFFFFFF);
        break;
    }
    case W_SLIDER: {
        int trace_y = w->y + w->h / 2 - 3;
        meow_ui_fill_rect(w->x, trace_y, w->w, 6, th->dim);
        int range = w->max - w->min;
        int frac = range ? (w->val - w->min) * w->w / range : 0;
        if (frac > 0) meow_ui_fill_rect(w->x, trace_y, frac, 6, th->accent);
        int tx = w->x + frac;
        int ty = w->y + w->h / 2;
        meow_gfx_fill_round(tx - 10, ty - 10, 20, 20, 10, th->fg);
        break;
    }
    case W_SWITCH: {
        uint32_t bg = w->on ? th->accent : th->dim;
        meow_gfx_fill_round(w->x, w->y, w->w, w->h, w->h / 2, bg);
        int knob_r = w->h / 2 - 3;
        int kx = w->on ? w->x + w->w - knob_r * 2 - 3 : w->x + 3;
        meow_gfx_fill_round(kx, w->y + 3, knob_r * 2, knob_r * 2, knob_r, 0xFFFFFF);
        break;
    }
    case W_LIST: {
        int rowh = 44, pad = 16;
        for (int i = 0; i < w->count; i++) {
            int ry = w->y + i * rowh;
            if (ry >= w->y + w->h) break;
            if (i == w->sel) meow_ui_fill_rect(w->x, ry, w->w, rowh, th->accent);
            char label[64] = "";
            if (w->src && w->src(i, label, (int)sizeof label, w->ctx)) {
                uint32_t col = (i == w->sel) ? 0xFFFFFF : th->fg;
                meow_ui_text(w->x + pad, ry + (rowh - meow_ui_text_height(th->font_body)) / 2,
                             label, th->font_body, col);
            }
            meow_ui_fill_rect(w->x, ry + rowh - 1, w->w, 1, th->dim);
        }
        break;
    }
    default: break;
    }
}