//
// Created by jedi on 25.06.21.
//

#include "web.h"
#include "system.h"
#include "lux.h"
#include "wifi.h"
#include "log.h"

#include <cstring>
#include <FreeRTOS.h>
#include <task.h>

extern "C" {
#include <sysparam.h>
#include <lwipopts.h>
}

#include <espressif/esp_common.h>
#include <lwip/tcp.h>

extern "C" {
#include <httpd/httpd.h>
}

#include "messages.h"

using namespace fiatlux;

#define vTaskDelayMs(ms) vTaskDelay((ms) / portTICK_PERIOD_MS)

uint16_t voltage_val;

struct {
    bool global;
    bool connection;
    bool wifi;
    bool voltage;
} has_changed;

void websocket_task(void *pvParameter) {
    auto *pcb = (struct tcp_pcb *) pvParameter;

    size_t connstarttime = xTaskGetTickCount();
    has_changed = {true, true, true};
    syslog_attach();
    unsigned local_log_tail = syslog_current_tail();

    for (;;) {
        if(pcb == nullptr || pcb->state != ESTABLISHED) {
            syslog("Connection closed, deleting task\n");
            break;
        }

        //Syslog
        if(syslog_data_after(local_log_tail) != 0) {
            char response[128];
            response[0] = 'L';
            size_t len = syslog_copy_out(&response[4], 124, local_log_tail);
            response[1] = len;
            ((uint16_t &) response[2]) = local_log_tail & 0xFFFF;
            if(len < sizeof(response)) {
                LOCK_TCPIP_CORE();
                websocket_write(pcb, (unsigned char *) response, len + 4, WS_BIN_MODE);
                local_log_tail += len;
                UNLOCK_TCPIP_CORE();
            } else
                syslog("buffer too small -1\n");

            taskYIELD();
        }

        //Global Info
        if(false && has_changed.global) {
            timeval tv{};
            gettimeofday(&tv, nullptr);
            size_t uptime = xTaskGetTickCount() * portTICK_PERIOD_MS / 1000;
            int heap = (int) xPortGetFreeHeapSize();
            uint32_t chip_id = sdk_system_get_chip_id();
            uint32_t flash_id = sdk_spi_flash_get_id();
            uint32_t flash_size = sdk_flashchip.chip_size >> 10;
            char *hostname = nullptr;

            sysparam_get_string("hostname", &hostname);
            /* Generate response in JSON format */
            messages::frame<messages::system_info> frame;
            frame.cmd = messages::SYSTEM_INFO;
            frame.msg.walltime = tv.tv_sec;
            frame.msg.uptime = uptime;
            frame.msg.heap = heap;
            frame.msg.chipid = chip_id;
            frame.msg.flashid = flash_id;
            frame.msg.flashsize = flash_size;
            //frame.msg. = ; // hostname

            free(hostname);
            /*LOCK_TCPIP_CORE();
            websocket_write(pcb, (uint8_t * ) &frame, sizeof(frame), WS_BIN_MODE);
            has_changed.global = false;
            UNLOCK_TCPIP_CORE();*/

            taskYIELD();
        } else if(has_changed.connection) {
            timeval tv{};
            gettimeofday(&tv, nullptr);
            size_t connuptime = (xTaskGetTickCount() - connstarttime) * portTICK_PERIOD_MS / 1000;

            printf("conn %d: %d.%.%.%d <->  %d.%d.&d.%d \n", pcb->netif_idx, IP2STR(&pcb->local_ip),
                   IP2STR(&pcb->remote_ip));
            char response[192];
            size_t
                    len = snprintf(response, sizeof(response), "{\"connage\" : \"%d\"," "\"clientip\" : \""
            IPSTR
            "\"" "}", connuptime, IP2STR(&pcb->remote_ip));
            if(len < sizeof(response)) {
                LOCK_TCPIP_CORE();
                websocket_write(pcb, (unsigned char *) response, len, WS_TEXT_MODE);
                has_changed.connection = false;
                UNLOCK_TCPIP_CORE();
            } else
                syslog("buffer too small 1\n");

            taskYIELD();
        } else if(has_changed.wifi) {
            has_changed.wifi = false;
            uint8_t opmode = sdk_wifi_get_opmode();
            const char *opmode_str = "??";
            switch (opmode) {
                case NULL_MODE:
                    opmode_str = "Null";
                    break;
                case STATION_MODE:
                    opmode_str = "Station";
                    break;
                case SOFTAP_MODE:
                    opmode_str = "SoftAP";
                    break;
                case STATIONAP_MODE:
                    opmode_str = "StationAP";
                    break;
                default:
                    break;
            }


            /*struct sockaddr_storage addr;
            socklen_t addr_len = sizeof(addr);
            if (getpeername(s, (struct sockaddr *)&addr, &addr_len) == 0) {
                printf("peer\n");
            }*/


            if(opmode == SOFTAP_MODE || opmode == STATIONAP_MODE) {
                uint8_t hwaddr[6];
                sdk_wifi_get_macaddr(SOFTAP_IF, hwaddr);
                ip_info info{};
                sdk_wifi_get_ip_info(SOFTAP_IF, &info);

                char *apssid = nullptr;
                sysparam_get_string("wifi_ap_ssid", &apssid);

                /* Generate response in JSON format */
                char response[128];
                size_t len = snprintf(response, sizeof(response),
                                      "{\"opmode\" : \"%s\","
                                      " \"apssid\" : \"%s\","
                                      " \"apip\" : \"" IPSTR "\","
                                      " \"apmac\" : \"" MACSTR "\""
                                      "}", opmode_str, apssid, IP2STR(&info.ip), MAC2STR(hwaddr));
                free(apssid);
                if(len < sizeof(response)) {
                    LOCK_TCPIP_CORE();
                    websocket_write(pcb, (unsigned char *) response, len, WS_TEXT_MODE);
                    UNLOCK_TCPIP_CORE();
                } else
                    syslog("buffer too small 2\n");
            }

            taskYIELD();

            if(opmode == STATION_MODE || opmode == STATIONAP_MODE) {
                uint8_t hwaddr[6];
                sdk_wifi_get_macaddr(STATION_IF, hwaddr);
                ip_info info{};
                sdk_wifi_get_ip_info(STATION_IF, &info);
                char *stassid = nullptr;
                sysparam_get_string("wifi_sta_ssid", &stassid);

                /* Generate response in JSON format */
                char response[128];
                size_t len = snprintf(response, sizeof(response),
                                      "{\"opmode\" : \"%s\","
                                      " \"stassid\" : \"%s\","
                                      " \"staip\" : \"" IPSTR "\","
                                      " \"stamac\" : \"" MACSTR "\""
                                      "}", opmode_str, stassid, IP2STR(&info.ip), MAC2STR(hwaddr));
                free(stassid);
                if(len < sizeof(response)) {
                    LOCK_TCPIP_CORE();
                    websocket_write(pcb, (unsigned char *) response, len, WS_TEXT_MODE);
                    UNLOCK_TCPIP_CORE();
                } else
                    syslog("buffer too small 3\n");
            }

            taskYIELD();
        } else if(has_changed.voltage) {
            has_changed.voltage = false;
            messages::response res;
            res.val = voltage_val;
            res.ret = OK;
            res.cmd = (messages::id) 'V';
            LOCK_TCPIP_CORE();
            websocket_write(pcb, (uint8_t * ) & res, sizeof(res), WS_BIN_MODE);
            UNLOCK_TCPIP_CORE();
            taskYIELD();
        } else {
            //taskYIELD();
            //printf("no change a\n");
            vTaskDelay(50);
            //printf("no change b\n");
        }
        //printf("9: %d\n",gpio_read(9));
        //printf("10: %d\n",gpio_read(10));
    }

    syslog_detach();

    vTaskDelete(nullptr);
}

/**
 * This function is called when websocket frame is received.
 *
 * Note: this function is executed on TCP thread and should return as soon
 * as possible.
 */
void websocket_cb(struct tcp_pcb *pcb, char *data, u16_t data_len,
                  uint8_t /*mode*/) { //mode should be WS_BIN_MODE or WS_TEXT_MODE

    messages::response res;
    res.cmd = messages::NONE;
    res.ret = ERROR;
    res.val = 0;

    bool togl = false;

    if(data[0] == 'R') {
        // Restart
        res.cmd = (messages::id) 'R';
        res.ret = OK;
    } else if(data[0] == 'X') {
        // Clear Config
        res.cmd = (messages::id) 'X';
        res.ret = OK;
    } else if(data[0] == 'D') {
        // Disable LED
        syslog("G\n");
        signal_led(false);
        res.cmd = (messages::id) 'G';
        res.ret = OK;
        res.val = 1;
    } else if(data[0] == 'E') {
        // Enable LED
        syslog("E\n");
        signal_led(true);
        res.cmd = (messages::id) 'G';
        res.ret = OK;
        res.val = 0;
    } else if(data[0] == 'F') {
        togl = !togl;
        signal_led(togl);
        auto *f = (messages::fw_frame *) data;
        if(f->seq == 0) {
            system_otaflash_init();
        }
        uint16_t ack = 0;
        res.ret = system_otaflash_chunk(f->data, ntohs(f->len), ntohs(f->seq), ntohl(f->hash), &ack);
        res.val = htons(ack);
        res.cmd = (messages::id) 'F';
    } else if(data[0] == 'C') {
        signal_led(false);
        auto *f = (messages::fw_check *) data;
        res.ret = system_otaflash_verify_and_switch(ntohl(f->len), ntohl(f->hash));
        res.cmd = (messages::id) 'C';
    } else if(data[0] == 'S') {
        int8_t en = 0;
        if(data[1] == 'E')
            en = 1;
        char *ssid = &data[2];
        size_t ssid_len = strlen(ssid);
        char *password = &data[3 + ssid_len];
        size_t password_len = strlen(password);
        (void) password_len;

        sysparam_set_int8("wifi_sta_enable", en);
        sysparam_set_string("wifi_sta_ssid", ssid);
        sysparam_set_string("wifi_sta_password", password);

        //sysparam_get_int8("wifi_sta_dhcp", wifi_sta_dhcp);
        //sysparam_get_int32("wifi_sta_ip_addr", wifi_sta_ip_addr);
        //sysparam_get_int32("wifi_sta_netmask", wifi_sta_netmask);
        //sysparam_get_int32("wifi_sta_gateway", wifi_sta_gateway);
        res.cmd = (messages::id) 'S';
    } else if(data[0] == 'A') {
        int8_t en = 0;
        uint8_t dns_enable = 0;
        uint8_t mdns_enable = 0;
        if(data[1] == 'E')
            en = 1;
        char *ssid = &data[2];
        size_t ssid_len = strlen(ssid);
        char *password = &data[3 + ssid_len];
        size_t password_len = strlen(password);
        (void) password_len;

        sysparam_set_int8("wifi_ap_enable", en);
        sysparam_set_string("wifi_ap_ssid", ssid);
        sysparam_set_string("wifi_ap_password", password);

        //sysparam_get_int32("wifi_ap_ip_addr", "172.16.0.1");
        //sysparam_get_int32("wifi_ap_netmask", "255.255.0.0");
        //sysparam_set_int8("wifi_ap_dns", dns_enable);
        //sysparam_set_int8("wifi_ap_mdns", mdns_enable);
        res.cmd = (messages::id) 'A';
    } else {
        printf("[websocket_callback]:\n%.*s\n", (int) data_len, (char *) data);
        printf("Unknown command %c\n", data[0]);
        res.ret = ERROR;
    }

    LOCK_TCPIP_CORE();
    websocket_write(pcb, (uint8_t * ) & res, sizeof(res), WS_BIN_MODE);
    UNLOCK_TCPIP_CORE();

    if(res.ret == OK) {
        if(res.cmd == 'R' || res.cmd == 'C') { // Restart
            printf("rebooting now");
            taskYIELD();
            vPortEnterCritical();
            sdk_system_restart();
        } else if(res.cmd == 'X') { // Clear Config
            taskYIELD();
            system_clear_config();
        }
    }
}

/**
 * This function is called when new websocket is open and
 * creates a new websocket_task if requested URI equals '/stream'.
 */
void websocket_open_cb(struct tcp_pcb *pcb, const char *uri) {
    printf("WS URI: %s\n", uri);
    if(!strcmp(uri, "/stream")) {
        xTaskCreate(&websocket_task, "websocket_task", 512, (void *) pcb, 3, nullptr);
    }
}

/*const char *gpio_cgi_handler(int iIndex, int iNumParams, char *pcParam[], char *pcValue[]) {
    for (int i = 0; i < iNumParams; i++) {
        if(strcmp(pcParam[i], "on") == 0) {
            uint8_t gpio_num = atoi(pcValue[i]);
            gpio_enable(gpio_num, GPIO_OUTPUT);
            gpio_write(gpio_num, true);
        } else if(strcmp(pcParam[i], "off") == 0) {
            uint8_t gpio_num = atoi(pcValue[i]);
            gpio_enable(gpio_num, GPIO_OUTPUT);
            gpio_write(gpio_num, false);
        } else if(strcmp(pcParam[i], "toggle") == 0) {
            uint8_t gpio_num = atoi(pcValue[i]);
            gpio_enable(gpio_num, GPIO_OUTPUT);
            gpio_toggle(gpio_num);
        }
    }
    return "/index.html";
}*/

extern "C" void httpd_task(void *pvParameters) {
    (void) pvParameters;

    //while (!uxSemaphoreGetCount(wifi_available_semaphore))
    //    vTaskDelay(500 / portTICK_PERIOD_MS);
    /*tCGI pCGIs[] = {
            {"/gpio", (tCGIHandler) gpio_cgi_handler},
    };

    // register handlers and start the server
    http_set_cgi_handlers(pCGIs, sizeof(pCGIs) / sizeof(pCGIs[0]));*/
    websocket_register_callbacks((tWsOpenHandler) websocket_open_cb, (tWsHandler) websocket_cb);
    httpd_init();

    while (1) {
        voltage_val = sdk_system_adc_read();
        has_changed.voltage = true;
        vTaskDelayMs(1000);
    }
}