/* 连接到FTP服务器   ，从FTP服务器中下载文件，下载逻辑 */
/* includes ----------------------------------------------------------*/
#include "EC800_FTP_OTA.h"

/* typedef -----------------------------------------------------------*/

ftpInfo s_ftpInfo = {
	.account = "cdzupdate",
	.passWord = "cdz2021!Z",
	.fileType = 1,
	.transmode = 1,
	.rsptimeout = 90,
	
	.ftpAddr = "39.98.211.244",
	.ftpPort = 21,
	.textDirectory = "/data/cdz",
	.textName = "centralCtrSys.bin",
	};

/* define ------------------------------------------------------------*/
// 登陆到FTP服务器
// 第一步：配置和激活 PDP 上下文
#define 	AT_QIACT_1									"AT+QIACT=1\r\n" // 激活 PDP 上下文 1
#define 	AT_QIACT_query								"AT+QIACT?\r\n"  // 查询 PDP 上下文状态 
#define 	AT_QFTPCFG_ID_1								"AT+QFTPCFG=\"contextid\",1\r\n"  // 查询 PDP 上下文状态
// 第二步： 配置用户账号和传输设置
#define 	AT_QFTPCFG_ACCOUNT							"AT+QFTPCFG=\"account\",\"%s\",\"%s\"\r\n" // 设置用户名和密码。
#define 	AT_QFTPCFG_FILE(fileType)					"AT+QFTPCFG=\"filetype\"," #fileType "\r\n" // 设置文件类型为ASCII AT+QFTPCFG="filetype",1
#define 	AT_QFTPCFG_TRANS(mode)						"AT+QFTPCFG=\"transmode\"," #mode "\r\n" // 设置为被动传输方式AT+QFTPCFG="transmode",1
#define 	AT_QFTPCFG_TIMEOUT(time)					"AT+QFTPCFG=\"rsptimeout\"," #time "\r\n" // 设置最大响应时间（默认为90秒）
//第三步：登录FTP服务器。
#define 	AT_QFTPOPEN(addr,port)						"AT+QFTPOPEN=\"" #addr "\"," #port "\r\n" // 登录FTP服务器。

// 从FTP服务器下载文件 本项目文件较小，选择直接通过COM口输出下载数据
#define 	AT_QFTPCWD(directory)						"AT+QFTPCWD=\"" #directory "\"\r\n" // 设置当前目录。
#define 	AT_QFTPSIZE(textName)						"AT+QFTPSIZE=\"" #textName "\"\r\n" // 查询 FTP(S)服务器 test_my1.txt 文件大小
#define AT_QFTPGET(textName, startByte, downloadNum) \
    "AT+QFTPGET=\"" #textName "\",\"COM:\"," #startByte "," #downloadNum "\r\n" // 下载文件， 通过COM口输出特定字段的数据


// 一次下载的字节个数
#define 	DOWNLOAD_BYTE_LEN 							(512)
/* macro -------------------------------------------------------------*/

/* variables ---------------------------------------------------------*/

/* function prototypes -----------------------------------------------*/

/* 1.登陆到FTP服务器--------------------------------------------------------*/
static uint8_t logIn_step = 0;

/**
 * @brief       通过EC800登录FTP
 * @param       NONE
 * @note       	NONE
 * @retval      无
 */
void EC800_LogIn_FTP(void){
	char* found = NULL;
	uint8_t errorCnt = 0; // 错误计数
	ftpInfo *p_ftpInfo = &s_ftpInfo;
	char atCmd[100] = {0};  // 静态缓冲区用于存放AT命令

	p_ftpInfo->fileType = p_ftpInfo->fileType; // 避免报警告

	switch(logIn_step){
		case 0: // 配置和激活 PDP 上下文
//			EC800M_SendCommand(AT_QIACT_1);
//			
//			found = EC800M_RecRespond(g_usart3_rx_buf, AT_RESP_OK);
//
//			if (found != NULL) {
//				printf("Activation successful\r\n");
//			}else{
//				errorCnt++;
//				printf("Activation unsuccessful\r\n");
//			}	

			EC800M_SendCommand(AT_QIACT_query);

			found = EC800M_RecRespond(g_usart3_rx_buf, AT_RESP_OK);

			if (found != NULL) {
				printf("PDP Context Status OK\r\n");
			}else{
				errorCnt++;
				printf("PDP Context Status error\r\n");
			}	

			EC800M_SendCommand(AT_QFTPCFG_ID_1);
			
			found = EC800M_RecRespond(g_usart3_rx_buf, AT_RESP_OK);

			if (found != NULL) {
				printf("Set PDP context to 1.\r\n");
			}else{
				errorCnt++;
				printf("ERROR! Set PDP context to 1.\r\n");
			}	

			if(errorCnt == 0){
				logIn_step = 1;
			}
			break;
		case 1: // 配置用户账号和传输设置
			snprintf(atCmd, sizeof(atCmd), "AT+QFTPCFG=\"account\",\"%s\",\"%s\"\r\n", p_ftpInfo->account, p_ftpInfo->passWord);
			EC800M_SendCommand(atCmd);
			
			found = EC800M_RecRespond(g_usart3_rx_buf, AT_RESP_OK);

			if (found != NULL) {
				printf("FINISH! Set username and password.\r\n");
			}else{
				errorCnt++;
				printf("ERROR! Set username and password.\r\n");
			}	

			snprintf(atCmd, sizeof(atCmd), "AT+QFTPCFG=\"filetype\",%d\r\n", p_ftpInfo->fileType);
			EC800M_SendCommand(atCmd);
			
			found = EC800M_RecRespond(g_usart3_rx_buf, AT_RESP_OK);

			if (found != NULL) {
				printf("FINISH! Set username and password.\r\n");
			}else{
				errorCnt++;
				printf("ERROR! Set username and password.\r\n");
			}	

			snprintf(atCmd, sizeof(atCmd), "AT+QFTPCFG=\"transmode\",%d\r\n", p_ftpInfo->transmode);
			EC800M_SendCommand(atCmd);
			
			found = EC800M_RecRespond(g_usart3_rx_buf, AT_RESP_OK);

			if (found != NULL) {
				printf("FINISH! Set to passive transfer mode.\r\n");
			}else{
				errorCnt++;
				printf("ERROR! Set to passive transfer mode.\r\n");
			}	

			snprintf(atCmd, sizeof(atCmd), "AT+QFTPCFG=\"rsptimeout\",%d\r\n", p_ftpInfo->rsptimeout);
			EC800M_SendCommand(atCmd);
			
			found = EC800M_RecRespond(g_usart3_rx_buf, AT_RESP_OK);

			if (found != NULL) {
				printf("FINISH! Set username and password.\r\n");
			}else{
				errorCnt++;
				printf("ERROR! Set username and password.\r\n");
			}	

			if(errorCnt == 0){
				logIn_step = 2;
			}
			break;
		case 2: // 登录FTP服务器。
			snprintf(atCmd, sizeof(atCmd), "AT+QFTPOPEN=\"%s\",%d\r\n", p_ftpInfo->ftpAddr, p_ftpInfo->ftpPort);
			EC800M_SendCommand(atCmd);

			errorCnt = Accept_and_Compare_Str("+QFTPOPEN: 0,0");
			if(errorCnt == 1){
				errorCnt = 0;
				printf("FINISH! Log in to the FTP server.\r\n");
			}else{
				printf("ERROR! Log in to the FTP server.\r\n");
			}

			if(errorCnt == 0){
				logIn_step = 3;
			}
			break;
		default :
			break;
	}

	
}

/* 2.从FTP服务器上下载文件--------------------------------------------------------*/
/**
 * @brief       剔除除去固件的其他的数据
 * @param       NONE
 * @note       	NONE
 * @retval      无
 */
int extract_data_as_uint32(char* input, uint32_t* output, size_t output_size) {
    const char* start_marker = "\r\nCONNECT\r\n";
    const char* end_marker = "\r\nOK\r\n";
    const char* start;
    const char* end;

    // 寻找开始标记
    start = strstr(input, start_marker);
    if (start != NULL) {
        // 如果发现开始标记，移动指针越过开始标记
        start += strlen(start_marker);
    } else {
        // 如果没有发现开始标记，则从输入串的开始处理
        start = input;
    }

    // 寻找结束标记
    end = search_sequence(start, USART3_REC_LEN - (start - input), end_marker, strlen(end_marker));
    if (end == NULL) {
        return HAL_ERROR;
    }

    // 计算要提取数据的长度
    size_t data_length = end - start;
    // 确保提取的数据长度为4的倍数，适用于 uint32_t
    if (data_length % sizeof(uint32_t) != 0) {
        return HAL_ERROR;
    }
    // 计算 uint32_t 的数量
    size_t data_length_uint32 = data_length / sizeof(uint32_t);
    if (data_length_uint32 > output_size) { // 确保输出缓冲区能够存放提取的数据
        return HAL_ERROR;
    }

    // 提取数据并转换为 uint32_t 数组
    memcpy(output, start, data_length_uint32 * sizeof(uint32_t));
    memset(input, 0, USART3_REC_LEN); // 清空输入缓冲区
    
    return HAL_OK;
}


uint8_t writeFlashPage(uint32_t address, uint32_t *pData) {
    if (FLASH_Erase(address, 1) != HAL_OK) {
        return 0;
    }
    if (FLASH_Write(address, pData, (FLASH_PAGE_SIZE / sizeof(uint32_t))) != HAL_OK) {
        return 0;
    }
    return 1;
}


#define AT_CMD_SIZE 100
uint32_t totalBytesReceived = 0;
uint32_t currentFlashAddress = APP2_ADDRESS;
uint32_t buffer[FLASH_PAGE_SIZE / sizeof(uint32_t)] = {0};  // 2KB缓冲区
uint32_t bufferIndex = 0;  // 缓冲区当前索引（以uint32_t为单位）

/**
 * @brief 更新固件
 * @note  执行过程中不能使用printf（会触发hardfault），暂不清楚原因
 * @retval 0表示未完成更新，1表示更新完成
 */
uint8_t UpdateFirmware(void) {
    ftpInfo *p_ftpInfo = &s_ftpInfo;
    char atCmd[AT_CMD_SIZE] = {0};  // 用于存放AT命令的静态缓冲区

    if (totalBytesReceived < p_ftpInfo->filesize) {
		 // 计算剩余要接收的字节数
        uint32_t remaining = p_ftpInfo->filesize - totalBytesReceived;
        uint32_t bytesToRead = remaining < DOWNLOAD_BYTE_LEN ? remaining : DOWNLOAD_BYTE_LEN;

		 // 设置FTP信息
        p_ftpInfo->startAddr = totalBytesReceived;
        p_ftpInfo->byteNum = bytesToRead;

		// 发送AT指令以开始接收
        snprintf(atCmd, AT_CMD_SIZE, "AT+QFTPGET=\"%s\",\"COM:\",%u,%u\r\n",
                 p_ftpInfo->textName, p_ftpInfo->startAddr, bytesToRead);
        EC800M_SendCommand(atCmd);

		// 只有当还有数据需要接收时，才进行下载和写入操作
        if (Accept_and_Compare_Str("+QFTPGET: 0,")) { // 接收成功
        	// 临时缓冲区，用于存放这次接收的数据
            uint32_t tempBuffer[DOWNLOAD_BYTE_LEN / sizeof(uint32_t)] = {0};
			memset(tempBuffer, 0xff, DOWNLOAD_BYTE_LEN); // 保证内存数据为缺省值0xff
            if (extract_data_as_uint32(g_usart3_rx_buf, tempBuffer, sizeof(tempBuffer) / sizeof(uint32_t)) != HAL_OK) {
//                printf("ERROR! UpdateFirmware_extract_data\n");
                return 0;
            }

			// 将临时缓冲区中的数据追加到主缓冲区
            for (uint32_t i = 0; i < (DOWNLOAD_BYTE_LEN / sizeof(uint32_t)); i++) {
                buffer[bufferIndex++] = tempBuffer[i];
				// 如果主缓冲区满了，写入Flash
                if (bufferIndex == (FLASH_PAGE_SIZE / sizeof(uint32_t))) {
					s_param_boot.pageNumMove += 1;
                    if (!writeFlashPage(currentFlashAddress, buffer)) {
//                        printf("ERROR! Write to flash failed\n");
                        return 0;
                    }
					
					// 重置缓冲区索引，准备下一轮数据接收
					memset(buffer, 0xFF, FLASH_PAGE_SIZE); // 保证内存数据为缺省值0xff
                    bufferIndex = 0;
                    currentFlashAddress += FLASH_PAGE_SIZE;
                }
            }
            totalBytesReceived += bytesToRead;
        } else {
//            printf("ERROR! Receive fault!\n");
            return 0;
        }

		// 如果下载完成，则处理剩余数据并写入最后一部分
        if (totalBytesReceived >= p_ftpInfo->filesize) {
            // 检查buffer是否有未写入的数据
            if (bufferIndex > 0) {
				s_param_boot.pageNumMove += 1;
                // 写入最后一页数据
                if (!writeFlashPage(currentFlashAddress, buffer)) {
//                    printf("ERROR! Write to flash failed\n");
                    return 0;
                }
            }
			
            return 1; // 更新完成
        }
    }
	return 0; // 更新未完成
}

uint8_t downloadStep = 0;
/**
 * @brief       FTP服务器上下载文件
 * @param       NONE
 * @note       	每一个任务周期过来下载2k的数据，以保证其他任务的正常运行
 * @retval      无
 */
void EC800_FTP_DownloadText(void){
	uint8_t errorCnt = 0; // 错误计数
	ftpInfo *p_ftpInfo = &s_ftpInfo;
	char atCmd[100] = {0};  // 静态缓冲区用于存放AT命令
	uint8_t backTemp = 0; // 返回值临时变量

	switch(downloadStep){
		case 0: // 设置文件目录
			snprintf(atCmd, sizeof(atCmd), "AT+QFTPCWD=\"%s\"\r\n", p_ftpInfo->textDirectory);
			EC800M_SendCommand(atCmd);
			
			errorCnt = Accept_and_Compare_Str("+QFTPCWD: 0,0");

			if (errorCnt == 1) {
				errorCnt = 0;
				printf("FINISH! Set the file directory.\r\n");
			}else{
				printf("ERROR! Set the file directory.\r\n");
			}	

			if(errorCnt == 0){
				downloadStep = 1;
			}
			break;
		case 1: // 获取文件长度
			snprintf(atCmd, sizeof(atCmd), "AT+QFTPSIZE=\"%s\"\r\n", p_ftpInfo->textName);
			EC800M_SendCommand(atCmd);
			
			errorCnt = Accept_and_Compare_Str("+QFTPSIZE: 0,");

			if (errorCnt == 1) {
				errorCnt = 0;
				printf("FINISH! Get the length of the file.\r\n");
				// 使用sscanf从字符串中解析整数
			    if(sscanf(g_usart3_rx_buf, "\r\n+QFTPSIZE: %*d,%u", &(p_ftpInfo->filesize)) == 1) {
			        // 解析成功，filesize变量现在包含值1000
			        printf("The filesize is: %u\n", p_ftpInfo->filesize);
			    } else {
			        // 解析失败
			        errorCnt++;
			        printf("Failed to parse the filesize.\n");
			    }
			}else{
				printf("ERROR! Get the length of the file.\r\n");
			}	

			if(errorCnt == 0){
				downloadStep = 2;
			}
			break;
		case 2:
			// 判断当前所处APP地址 选取更新地址
			currentFlashAddress = APP2_ADDRESS;

			downloadStep = 3;
			break;
		case 3: // 更新固件
			backTemp = UpdateFirmware();
			if(backTemp == 1){
				downloadStep = 4;
			}
			break;
		case 4: // 固件更新完成，设置更新标志，并复位
			s_param_boot.updateFlag = 1; // 需要更新固件并搬移
			Write_paramArea();
			downloadStep = 5;
			break;
		default :
			break;
	}
}

/* 3. OTA升级从FTP流程--------------------------------------------------------*/
uint8_t upgradeStep = 0;
/**
 * @brief       OTA升级从FTP
 * @param       NONE
 * @note       	NONE
 * @retval      无
 */
void EC800_FTP_OTA_Upgrade(void){
	ec800Date *p_ec800Date = &s_ec800Date;

	// 等待ec800模块初始化完成 并满足更新条件
	if(!((p_ec800Date->ec800InitFlag) && (p_ec800Date->hardwareUpdate))){
		return; 
	}

	switch (upgradeStep){
		case 0: // 登陆到FTP服务器
			EC800_LogIn_FTP();
			if(logIn_step == 3){
				upgradeStep = 1;
			}
			break;
		case 1: // 从FTP服务器上下载文件
			EC800_FTP_DownloadText();
			if(downloadStep == 5){
				upgradeStep = 2;
			}
			break;
		case 2: // 复位升级
			osDelay(1000);
			HAL_NVIC_SystemReset();
			break;
		default:
			break;
	}
}