/**
 * @file    hal_mock.c
 * @brief   HAL 层 PC 模拟实现
 *          在 PC 上编译运行时使用，模拟 GPIO 读写和系统时钟
 *          上板时替换为真实 STM32 HAL 实现
 */
#ifndef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 199309L
#endif
#include "hal_gpio.h"
#include <stdio.h>
#include <time.h>

/* ======== 模拟 GPIO 状态 ======== */
static uint8_t g_pin_state[GPIO_PORT_COUNT][14];  /* 14 pins per port */
static uint8_t g_pin_mode[GPIO_PORT_COUNT][14];

/* ======== 模拟按键输入（测试用） ======== */
static uint8_t g_mock_button_level = 1;  /* 默认未按下(高电平) */

void mock_set_button(uint8_t pressed) {
    g_mock_button_level = pressed ? 0 : 1;  /* 低有效 */
}

/* ======== HAL 实现 ======== */

void HAL_GPIO_Init(GPIO_Port_TypeDef port, GPIO_Pin_TypeDef pin, GPIO_Mode_TypeDef mode) {
    if (port < GPIO_PORT_COUNT) {
        for (int i = 0; i < 14; i++) {
            if (pin & (1U << i)) {
                g_pin_mode[port][i] = (uint8_t)mode;
            }
        }
    }
    printf("[HAL] GPIO Init: Port=%d Pin=0x%04X Mode=%d\n", port, pin, mode);
}

void HAL_GPIO_WritePin(GPIO_Port_TypeDef port, GPIO_Pin_TypeDef pin, GPIO_PinState_TypeDef state) {
    if (port < GPIO_PORT_COUNT) {
        for (int i = 0; i < 14; i++) {
            if (pin & (1U << i)) {
                g_pin_state[port][i] = (uint8_t)state;
            }
        }
    }
    /* 模拟 LED 输出 */
    if (port == GPIO_PORT_B && (pin & GPIO_PIN_0)) {
        printf("[LED] %s\n", state ? "ON  ■" : "OFF ·");
    }
}

uint8_t HAL_GPIO_ReadPin(GPIO_Port_TypeDef port, GPIO_Pin_TypeDef pin) {
    /* 模拟按键读取 */
    if (port == GPIO_PORT_A && (pin & GPIO_PIN_0)) {
        return g_mock_button_level;
    }
    if (port < GPIO_PORT_COUNT) {
        for (int i = 0; i < 14; i++) {
            if (pin & (1U << i)) {
                return g_pin_state[port][i];
            }
        }
    }
    return 0;
}

void HAL_GPIO_TogglePin(GPIO_Port_TypeDef port, GPIO_Pin_TypeDef pin) {
    if (port < GPIO_PORT_COUNT) {
        for (int i = 0; i < 14; i++) {
            if (pin & (1U << i)) {
                g_pin_state[port][i] = !g_pin_state[port][i];
            }
        }
    }
}

/* ======== 时基 ======== */

static uint32_t g_start_ms = 0;

static uint32_t get_system_ms(void) {
    struct timespec ts;
    clock_gettime(CLOCK_MONOTONIC, &ts);
    return (uint32_t)(ts.tv_sec * 1000 + ts.tv_nsec / 1000000);
}

void HAL_Delay(uint32_t ms) {
    /* PC 模拟: 忙等（仅测试用） */
    uint32_t start = get_system_ms();
    while ((get_system_ms() - start) < ms) {
        /* spin */
    }
}

uint32_t HAL_GetTick(void) {
    if (g_start_ms == 0) {
        g_start_ms = get_system_ms();
    }
    return get_system_ms() - g_start_ms;
}