/* PWM 的假实现：只记住配置与占空比。宿主机专用。 */
#include <string.h>

#include "sim_hal.h"

typedef struct {
    bool     configured;
    int      pin;
    uint32_t freq_hz;
    uint16_t permille;
} ch_t;

static ch_t s_ch[HAL_PWM_CH_MAX];

void sim_pwm_reset_internal(void); /* 只给 sim_hal_reset() 用 */

void sim_pwm_reset_internal(void) { memset(s_ch, 0, sizeof(s_ch)); }

static bool valid(int ch) { return ch >= 0 && ch < HAL_PWM_CH_MAX; }

hal_err_t hal_pwm_config(int ch, int pin, uint32_t freq_hz)
{
    if (!valid(ch) || pin < 0 || pin >= SIM_GPIO_PINS || freq_hz == 0) {
        return HAL_ERR_ARG;
    }
    s_ch[ch] = (ch_t){ .configured = true, .pin = pin, .freq_hz = freq_hz, .permille = 0 };
    return HAL_OK;
}

hal_err_t hal_pwm_set_permille(int ch, uint16_t permille)
{
    if (!valid(ch) || !s_ch[ch].configured || permille > 1000) {
        return HAL_ERR_ARG;
    }
    s_ch[ch].permille = permille;
    return HAL_OK;
}

hal_err_t hal_pwm_get_permille(int ch, uint16_t *permille)
{
    if (!valid(ch) || !s_ch[ch].configured || permille == NULL) {
        return HAL_ERR_ARG;
    }
    *permille = s_ch[ch].permille;
    return HAL_OK;
}

int      sim_pwm_pin(int ch)      { return valid(ch) && s_ch[ch].configured ? s_ch[ch].pin : -1; }
uint32_t sim_pwm_freq(int ch)     { return valid(ch) && s_ch[ch].configured ? s_ch[ch].freq_hz : 0; }
int      sim_pwm_permille(int ch) { return valid(ch) && s_ch[ch].configured ? (int)s_ch[ch].permille : -1; }