#include "web_handlers.h"
#include "../app.h"
#include "esp_log.h"
#include "network/network.h"
#include "common/system_context.h"
#include "esp_random.h"
#include <sstream>
#include <iomanip>

static const char* TAG = "DiscordWebHandler";

WebHandler::~WebHandler() {
  stop_web_server();
}

esp_err_t WebHandler::start_web_server() {
  if (web_server_ && web_server_->is_running()) {
    ESP_LOGI(TAG, "Web server already running");
    return ESP_OK;
  }

  auth_key_ = generate_auth_key_();

  uint16_t port = web_server_->start(
    auth_key_,
    8080
  );
  if (port == 0) {
    ESP_LOGE(TAG, "Failed to start web server");
    return ESP_FAIL;
  }

  esp_err_t ret = register_web_endpoints_();
  if (ret != ESP_OK) {
    ESP_LOGE(TAG, "Failed to register web endpoints");
    web_server_->stop();
    return ret;
  }

  ESP_LOGI(TAG, "Web server started");
  return ESP_OK;
}

esp_err_t WebHandler::stop_web_server() {
  if (web_server_) {
    web_server_->stop();
    ESP_LOGI(TAG, "Web server stopped");
  }
  auth_key_.clear();
  return ESP_OK;
}

std::string WebHandler::get_url() const {
  if (web_server_ && web_server_->is_running()) {
    NetworkHandler* network_handler = SystemContext::instance().get_network_handler();
    if (!network_handler) {
      ESP_LOGE(TAG, "Network handler not available in system context");
      return "";
    }
    WifiHandler& wifi_handler = network_handler->get_wifi_handler();
    std::string device_ip = wifi_handler.get_current_ip();
    if (device_ip.empty()) {
      ESP_LOGW(TAG, "Device not connected to WiFi");
      return "";
    }
    uint16_t port = web_server_->get_port();

    std::ostringstream url;
    url << "http://" << device_ip << ":" << port << "/?auth=" << auth_key_;
    return url.str();
  }
  return "";
}

std::string WebHandler::get_device_ip() const {
  if (web_server_ && web_server_->is_running()) {
    NetworkHandler* network_handler = SystemContext::instance().get_network_handler();
    if (!network_handler) {
      ESP_LOGE(TAG, "Network handler not available in system context");
      return "";
    }
    WifiHandler& wifi_handler = network_handler->get_wifi_handler();
    return wifi_handler.get_current_ip();
  }
  return "";
}

uint16_t WebHandler::get_port() const {
  if (web_server_ && web_server_->is_running()) {
    return web_server_->get_port();
  }
  return 0;
}

//
//
//


std::string WebHandler::generate_auth_key_() {
  // Generate 128-bit random key using ESP32 hardware RNG
  uint32_t rand_values[4];
  for (int i = 0; i < 4; i++) {
    rand_values[i] = esp_random();
  }

  // Convert to hex string
  std::ostringstream oss;
  oss << std::hex << std::setfill('0');
  for (int i = 0; i < 4; i++) {
    oss << std::setw(8) << rand_values[i];
  }

  return oss.str();
}


esp_err_t WebHandler::register_web_endpoints_() {
  if (!web_server_ || !web_server_->is_running()) {
    return ESP_FAIL;
  }

  // GET / - Serve settings page
  httpd_uri_t settings_page_uri = {
    .uri = "/",
    .method = HTTP_GET,
    .handler = settings_page_handler_,
    .user_ctx = this
  };
  web_server_->register_uri_handler(&settings_page_uri);

  // POST /save - Save settings
  httpd_uri_t save_settings_uri = {
    .uri = "/save",
    .method = HTTP_POST,
    .handler = save_settings_handler_,
    .user_ctx = this
  };
  web_server_->register_uri_handler(&save_settings_uri);

  // POST /test - Test connection
  httpd_uri_t test_connection_uri = {
    .uri = "/test",
    .method = HTTP_POST,
    .handler = test_connection_handler_,
    .user_ctx = this
  };
  web_server_->register_uri_handler(&test_connection_uri);

  return ESP_OK;
}

esp_err_t WebHandler::settings_page_handler_(httpd_req_t* req) {
  WebHandler* self = static_cast<WebHandler*>(req->user_ctx);

  // Validate auth
  size_t query_len = httpd_req_get_url_query_len(req);
  if (query_len == 0) {
    httpd_resp_send_err(req, HTTPD_401_UNAUTHORIZED, "Unauthorized");
    return ESP_FAIL;
  }

  char* query = new char[query_len + 1];
  if (httpd_req_get_url_query_str(req, query, query_len + 1) != ESP_OK) {
    delete[] query;
    httpd_resp_send_err(req, HTTPD_400_BAD_REQUEST, "Bad Request");
    return ESP_FAIL;
  }

  if (!self->web_server_->validate_auth(query)) {
    delete[] query;
    httpd_resp_send_err(req, HTTPD_401_UNAUTHORIZED, "Unauthorized");
    return ESP_FAIL;
  }
  delete[] query;

  // Get current settings (access private members via friend)
  std::string current_ip = self->setting_handler_->get_remote_ip();
  uint16_t current_port = self->setting_handler_->get_remote_port();
  uint16_t current_local_port = self->setting_handler_->get_local_port();

  // Build HTML page
  std::ostringstream html;
  html << "<!DOCTYPE html><html><head>"
    << "<meta name='viewport' content='width=device-width, initial-scale=1'>"
    << "<title>Discord Bridge Settings</title>"
    << "<style>"
    << "body{font-family:Arial,sans-serif;max-width:600px;margin:50px auto;padding:20px;}"
    << "h1{color:#333;}"
    << "label{display:block;margin-top:15px;font-weight:bold;}"
    << "input{width:100%;padding:10px;margin-top:5px;box-sizing:border-box;font-size:16px;}"
    << "button{width:100%;padding:12px;margin-top:20px;font-size:16px;cursor:pointer;}"
    << ".btn-primary{background:#4CAF50;color:white;border:none;}"
    << ".btn-secondary{background:#008CBA;color:white;border:none;}"
    << "#result{margin-top:20px;padding:10px;border-radius:5px;display:none;}"
    << ".success{background:#d4edda;color:#155724;border:1px solid #c3e6cb;}"
    << ".error{background:#f8d7da;color:#721c24;border:1px solid #f5c6cb;}"
    << "</style></head><body>"
    << "<h1>Discord Bridge Settings</h1>"
    << "<form id='settingsForm'>"
    << "<label for='ip'>Bridge IP Address:</label>"
    << "<input type='text' id='ip' name='ip' placeholder='e.g., 192.168.1.100' value='" << current_ip << "' required>"
    << "<label for='port'>Bridge Port:</label>"
    << "<input type='number' id='port' name='port' placeholder='e.g., 4211' value='" << current_port << "' required min='1' max='65535'>"
    << "<label for='localPort'>ESP32 Local Port:</label>"
    << "<input type='number' id='localPort' name='localPort' placeholder='e.g., 4212' value='" << current_local_port << "' required min='1' max='65535'>"
    << "<button type='button' class='btn-secondary' onclick='testConnection()'>Test Connection</button>"
    << "<button type='submit' class='btn-primary'>Save Settings</button>"
    << "</form>"
    << "<div id='result'></div>"
    << "<script>"
    << "const form=document.getElementById('settingsForm');"
    << "const result=document.getElementById('result');"
    << "function showResult(msg,isSuccess){"
    << "result.textContent=msg;"
    << "result.className=isSuccess?'success':'error';"
    << "result.style.display='block';"
    << "}"
    << "function testConnection(){"
    << "const ip=document.getElementById('ip').value;"
    << "const port=document.getElementById('port').value;"
    << "const localPort=document.getElementById('localPort').value;"
    << "if(!ip||!port||!localPort){showResult('Please fill all fields',false);return;}"
    << "showResult('Testing connection...',false);"
    << "fetch('/test',{method:'POST',headers:{'Content-Type':'application/x-www-form-urlencoded'},"
    << "body:'ip='+encodeURIComponent(ip)+'&port='+encodeURIComponent(port)+'&localPort='+encodeURIComponent(localPort)})"
    << ".then(r=>r.json()).then(data=>showResult(data.message,data.success))"
    << ".catch(()=>showResult('Request failed',false));"
    << "}"
    << "form.addEventListener('submit',function(e){"
    << "e.preventDefault();"
    << "const ip=document.getElementById('ip').value;"
    << "const port=document.getElementById('port').value;"
    << "const localPort=document.getElementById('localPort').value;"
    << "if(!ip||!port||!localPort){showResult('Please fill all fields',false);return;}"
    << "fetch('/save',{method:'POST',headers:{'Content-Type':'application/x-www-form-urlencoded'},"
    << "body:'ip='+encodeURIComponent(ip)+'&port='+encodeURIComponent(port)+'&localPort='+encodeURIComponent(localPort)})"
    << ".then(r=>r.json()).then(data=>{showResult(data.message,data.success);"
    << "if(data.success)setTimeout(()=>result.style.display='none',3000);})"
    << ".catch(()=>showResult('Request failed',false));"
    << "});"
    << "</script></body></html>";

  std::string html_str = html.str();
  httpd_resp_set_type(req, "text/html");
  httpd_resp_send(req, html_str.c_str(), html_str.length());

  return ESP_OK;
}

esp_err_t WebHandler::save_settings_handler_(httpd_req_t* req) {
  WebHandler* self = static_cast<WebHandler*>(req->user_ctx);

  // Read POST data
  char* buf = new char[req->content_len + 1];
  int ret = httpd_req_recv(req, buf, req->content_len);
  if (ret <= 0) {
    delete[] buf;
    httpd_resp_send_err(req, HTTPD_400_BAD_REQUEST, "Failed to read request");
    return ESP_FAIL;
  }
  buf[ret] = '\0';

  // Parse form data
  char ip[64] = { 0 };
  char port_str[8] = { 0 };
  char local_port_str[8] = { 0 };

  httpd_query_key_value(buf, "ip", ip, sizeof(ip));
  httpd_query_key_value(buf, "port", port_str, sizeof(port_str));
  httpd_query_key_value(buf, "localPort", local_port_str, sizeof(local_port_str));
  delete[] buf;

  if (strlen(ip) == 0 || strlen(port_str) == 0 || strlen(local_port_str) == 0) {
    const char* resp = "{\"success\":false,\"message\":\"Missing fields\"}";
    httpd_resp_set_type(req, "application/json");
    httpd_resp_send(req, resp, strlen(resp));
    return ESP_OK;
  }

  uint16_t port = static_cast<uint16_t>(atoi(port_str));
  uint16_t local_port = static_cast<uint16_t>(atoi(local_port_str));
  if (port == 0 || local_port == 0) {
    const char* resp = "{\"success\":false,\"message\":\"Invalid port\"}";
    httpd_resp_set_type(req, "application/json");
    httpd_resp_send(req, resp, strlen(resp));
    return ESP_OK;
  }

  // Save settings
  if (self && self->setting_handler_) {
    self->setting_handler_->save_settings(std::string(ip), port, local_port);
  }

  const char* resp = "{\"success\":true,\"message\":\"Settings saved successfully\"}";
  httpd_resp_set_type(req, "application/json");
  httpd_resp_send(req, resp, strlen(resp));

  ESP_LOGI(TAG, "Settings saved via web interface: %s:%u (local port: %u)", ip, port, local_port);

  return ESP_OK;
}

esp_err_t WebHandler::test_connection_handler_(httpd_req_t* req) {
  WebHandler* self = static_cast<WebHandler*>(req->user_ctx);
  IotDisBridge* bridge = self ? self->bridge_ : nullptr;

  // Read POST data
  char* buf = new char[req->content_len + 1];
  int ret = httpd_req_recv(req, buf, req->content_len);
  if (ret <= 0) {
    delete[] buf;
    httpd_resp_send_err(req, HTTPD_400_BAD_REQUEST, "Failed to read request");
    return ESP_FAIL;
  }
  buf[ret] = '\0';

  // Parse form data
  char ip[64] = { 0 };
  char port_str[8] = { 0 };
  char local_port_str[8] = { 0 };

  httpd_query_key_value(buf, "ip", ip, sizeof(ip));
  httpd_query_key_value(buf, "port", port_str, sizeof(port_str));
  httpd_query_key_value(buf, "localPort", local_port_str, sizeof(local_port_str));
  delete[] buf;

  if (strlen(ip) == 0 || strlen(port_str) == 0 || strlen(local_port_str) == 0) {
    const char* resp = "{\"success\":false,\"message\":\"Missing fields\"}";
    httpd_resp_set_type(req, "application/json");
    httpd_resp_send(req, resp, strlen(resp));
    return ESP_OK;
  }

  uint16_t port = static_cast<uint16_t>(atoi(port_str));
  uint16_t local_port = static_cast<uint16_t>(atoi(local_port_str));
  if (port == 0 || local_port == 0) {
    const char* resp = "{\"success\":false,\"message\":\"Invalid port\"}";
    httpd_resp_set_type(req, "application/json");
    httpd_resp_send(req, resp, strlen(resp));
    return ESP_OK;
  }

  // Test connection
  bool success = false;
  if (bridge) {
    success = bridge->test_connection(std::string(ip), port, local_port);
  } else {
    ESP_LOGE(TAG, "IotDisBridge pointer is null, cannot test connection");
  }

  const char* resp = success
    ? "{\"success\":true,\"message\":\"Connection successful!\"}"
    : "{\"success\":false,\"message\":\"No response from bridge\"}";

  httpd_resp_set_type(req, "application/json");
  httpd_resp_send(req, resp, strlen(resp));

  ESP_LOGI(TAG, "Connection test via web interface: %s:%u (local port: %u) - %s", ip, port, local_port, success ? "SUCCESS" : "FAILED");

  return ESP_OK;
}