#include "web_server.h"
#include "web_server_pages.h"
#include "sys_time.h"
#include "esp_http_server.h"
#include "esp_log.h"
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

static const char *TAG = "SYS_WEB";
static httpd_handle_t s_server;

static esp_err_t time_sync_handler(httpd_req_t *req)
{
    char query[128] = {0};
    if (httpd_req_get_url_query_str(req, query, sizeof(query)) == ESP_OK) {
        char val[32] = {0};
        if (httpd_query_key_value(query, "epoch", val, sizeof(val)) == ESP_OK) {
            time_t epoch = (time_t)strtoull(val, NULL, 10);
            if (epoch >= 1704067200ULL) {
                sys_time_set_epoch(epoch);
            }
        }
    }

    struct tm tm_info;
    bool synced = sys_time_get_local(&tm_info);
    time_t now = sys_time_get_epoch();
    char strftime_buf[64];
    strftime(strftime_buf, sizeof(strftime_buf), "%Y-%m-%d %H:%M:%S", &tm_info);

    char resp[160];
    snprintf(resp, sizeof(resp), "{\"synced\":%s,\"epoch\":%lld,\"time\":\"%s\",\"tz\":\"%s\"}",
             synced ? "true" : "false", (long long)now, strftime_buf, sys_time_get_timezone());

    httpd_resp_set_type(req, "application/json");
    return httpd_resp_sendstr(req, resp);
}

esp_err_t web_server_start(void)
{
    if (s_server) return ESP_OK;

    httpd_config_t config = HTTPD_DEFAULT_CONFIG();
    config.max_uri_handlers = 16;
    config.stack_size = 8192;
    esp_err_t err = httpd_start(&s_server, &config);
    if (err != ESP_OK) return err;

    web_server_register_wifi_pages(s_server);
    web_server_register_ota_page(s_server);
    web_server_register_serial_pages(s_server);

    const httpd_uri_t time_uri = {
        .uri = "/time/sync",
        .method = HTTP_GET,
        .handler = time_sync_handler
    };
    httpd_register_uri_handler(s_server, &time_uri);

    ESP_LOGI(TAG, "Web server started with real-time sync service");
    return ESP_OK;
}