#include "Serial.h"
#include "Delay.h" // Get_Time_ms 在这里，所以我们包含它
#include <string.h>

#define RX_BUFFER_SIZE 2048  // 加密响应会因Base64膨胀，需保留完整HTTP响应
char RxBuffer[RX_BUFFER_SIZE];
uint16_t RxCounter = 0;

// 初始化ESP8266所用的串口 (根据连接图.md: USART1 PA9/PA10)
void Serial_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);

    // PA9: USART1_TX
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // PA10: USART1_RX
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStructure);

    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; // 优先级低于K210
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    USART_Cmd(USART1, ENABLE);
}

// 发送字符串
void Serial_SendString(const char* String)
{
    for (uint32_t i = 0; String[i] != '\0'; i++)
    {
        while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
        USART_SendData(USART1, String[i]);
    }
}

// 获取接收缓冲区
char* Serial_GetRxBuffer(void)
{
    return RxBuffer;
}

// 清空接收缓冲区
void Serial_ClearRxBuffer(void)
{
    memset(RxBuffer, 0, RX_BUFFER_SIZE);
    RxCounter = 0;
}

// USART1中断服务函数 (ESP8266)
void USART1_IRQHandler(void)
{
    if (USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
    {
        uint8_t RxData = USART_ReceiveData(USART1);
        if (RxCounter < RX_BUFFER_SIZE - 1)
        {
            RxBuffer[RxCounter++] = RxData;
        }
        USART_ClearITPendingBit(USART1, USART_IT_RXNE);
    }
}