import 'dart:convert';

import 'package:icalserver/icalendar.dart';
import 'package:jiffy/jiffy.dart';
import 'package:supabase/supabase.dart';
import 'package:shelf/shelf.dart';

class CalendarHandler {
  SupabaseClient getSupabaseClient(Request request) {
    // final supabaseUrl = request.headers['supabase-url'];
    // final authHeader = request.headers['authorization'];
    // final token = authHeader!.substring(7); // Remove 'Bearer ' prefix

    final supabaseUrl = 'http://baas.fares.cyou:8000';
    final token =
        "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyAgCiAgICAicm9sZSI6ICJzZXJ2aWNlX3JvbGUiLAogICAgImlzcyI6ICJzdXBhYmFzZS1kZW1vIiwKICAgICJpYXQiOiAxNjQxNzY5MjAwLAogICAgImV4cCI6IDE3OTk1MzU2MDAKfQ.DaYlNEoUrrEn2Ig7tqibS-PHK5vgusbcbo7X36XVt4Q";
    return SupabaseClient(
      supabaseUrl,
      token,
    );
  }

  // Handler for the /link route
  Future<Response> getCalendar(Request request) async {
    final credentials = _getBasicAuthCredentials(request);
    if (credentials == null) {
      return Response.unauthorized('Invalid credentials');
    }

    final (username, password) = credentials;
    if (username != password) {
      return Response.unauthorized('Invalid credentials');
    }

    final supabase = getSupabaseClient(request);

    //print(licencesCsv);

    // Execute the query
    final rosterlist =
        await supabase.rpc('get_roster_ical', params: {'__tlc': username});

    // Handle the response
    final requester =
        (await supabase.from('licences').select().eq('tlc', username));
    print(
        'TLC: $username ...  EVENTS: ${rosterlist.length} ... Name: ${requester[0]['lname']}, ${requester[0]['fname']}');

    // Create an iCalendar object
    final ical = ICalendar();

    if (rosterlist is List) {
      for (var i = 0; i < rosterlist.length; i++) {
        final event = rosterlist[i];
        switch (event["_dutytype"]) {
          case "flight":
            ical.addEvent(
              summary: "${event["dep"]}-${event["des"]}",
              description: """
Flight ${event["al"]}${event["fnum"]} from ${event["dep"]} to ${event["des"]}
A/C: ${event["_reg"] ?? "---"}/${event["actype"]}
${event["_version"] != null ? "Ver: ${event["_version"]}" : ""} ${(event["_paxy"] != null || event["_paxc"] != null) ? "/ PAX: ${event["_paxc"] != null ? "C${event["_paxc"]}" : ""} Y${event["_paxy"] ?? "0"}" : ""}


Dep/Arr time: ${Jiffy.parse(event["_hdep"], isUtc: true).Hm} - ${Jiffy.parse(event["_hdes"], isUtc: true).Hm}
${event["_hdep_sched"] != null ? "Sched Dep time: ${Jiffy.parse(event["_hdep_sched"], isUtc: true).format(pattern: "dd MMM yyyy HH:mm")}" : ""}
${event["_delay"] != null ? "Delay codes: ${(event["_delay"] as List<dynamic>).map((e) {
                      final f = (e ?? "")
                          .split('|')
                          .map((j) => j == "" ? null : j)
                          .toList();
                      return "${(f[1]) ?? (f[0]) ?? '--'}:${((f[2]) ?? '0000').padLeft(4, '0')}";
                    })}" : ""}

Crew: 
${(event["crew"] as List<dynamic>).map((e) {
                final f = (e ?? "").split('|').toList();
                return "   ${f[0]}: ${f[2]}, ${f[3]} (${f[1]})";
              }).join("\n")}
"""
                  .replaceAll("\n", "\\n"),
              startTime: Jiffy.parse(event["_hdep"], isUtc: true).dateTime,
              endTime: Jiffy.parse(event["_hdes"]).dateTime,
              attendees: [],
            );
            break;
          case "dhflight" || "dhlimo":
            ical.addEvent(
              summary: "DH ${event["dep"]}-${event["des"]}",
              description: """
DH ${event["_dutytype"] == "dhflight" ? "Flight" : "Limo"} ${event["al"]}${event["fnum"]} from ${event["dep"]} to ${event["des"]}
${event["_dutytype"] == "dhflight" ? "A/C: ${event["_reg"] ?? "---"}/${event["actype"]}" : ""}
${event["_version"] != null ? "Ver: ${event["_version"]}" : ""} ${(event["_paxy"] != null || event["_paxc"] != null) ? "/ PAX: ${event["_paxc"] != null ? "C${event["_paxc"]}" : ""} Y${event["_paxy"] ?? "0"}" : ""}


Dep/Arr time: ${Jiffy.parse(event["_hdep"], isUtc: true).Hm} - ${Jiffy.parse(event["_hdes"], isUtc: true).Hm}
${event["_hdep_sched"] != null ? "Sched Dep time: ${Jiffy.parse(event["_hdep_sched"], isUtc: true).format(pattern: "dd MMM yyyy HH:mm")}" : ""}
${event["_delay"] != null ? "Delay codes: ${(event["_delay"] as List<dynamic>).map((e) {
                      final f = (e ?? "")
                          .split('|')
                          .map((j) => j == "" ? null : j)
                          .toList();
                      return "${(f[1]) ?? (f[0]) ?? '--'}:${((f[2]) ?? '0000').padLeft(4, '0')}";
                    })}" : ""}

Crew: 
${(event["crew"] as List<dynamic>).map((e) {
                final f = (e ?? "").split('|').toList();
                return "   ${f[0]}: ${f[2]}, ${f[3]} (${f[1]})";
              }).join("\n")}
"""
                  .replaceAll("\n", "\\n"),
              startTime: Jiffy.parse(event["_hdep"], isUtc: true).dateTime,
              endTime: Jiffy.parse(event["_hdes"]).dateTime,
              attendees: [],
            );
            break;
          case "standby" || "ground":
            ical.addEvent(
              summary:
                  "${event["_dutytype"] == "standby" ? "STDBY" : ""} ${event["label"]}",
              description: """
${event["_dutytype"] == "standby" ? "STDBY" : ""} ${event["label"]} @ ${event["dep"]}
Start/End time: ${Jiffy.parse(event["_hdep"], isUtc: true).Hm} - ${Jiffy.parse(event["_hdes"], isUtc: true).Hm}

Attendee: 
${(event["crew"] as List<dynamic>).map((e) {
                final f = (e ?? "").split('|').toList();
                return "   ${f[0]}: ${f[2]}, ${f[3]} (${f[1]})";
              }).join("\n")}
"""
                  .replaceAll("\n", "\\n"),
              startTime: Jiffy.parse(event["_hdep"], isUtc: true).dateTime,
              endTime: Jiffy.parse(event["_hdes"]).dateTime,
              attendees: [],
            );
            break;
          case "day":
            ical.addEvent(
              summary: "${event["label"]}",
              description: """
${event["label"]} @ ${event["dep"] ?? ""}

"""
                  .replaceAll("\n", "\\n"),
              startTime: Jiffy.parse(event["_hdep"]).dateTime,
              endTime: Jiffy.parse(event["_hdep"]).dateTime,
              attendees: [],
              allday: true,
            );
            break;
          default:
        }
      }
    }

    // Return the response with the iCalendar content
    await supabase.dispose();
    return Response.ok(
      ical.serialize(),
      headers: {'Content-Type': 'text/calendar; charset=utf-8'},
    );
  }

  (String, String)? _getBasicAuthCredentials(Request request) {
    // Get Authorization header
    if (!request.headers.containsKey('authorization')) {
      return null;
    }
    String authHeader = request.headers['authorization'] ?? "";
    if (!authHeader.startsWith('Basic ')) {
      return null;
    }

    // Extract and decode credentials
    try {
      String base64Credentials = authHeader.substring('Basic '.length);
      String credentials = utf8.decode(base64.decode(base64Credentials));
      List<String> userPass = credentials.split(':');

      if (userPass.length != 2) return null;

      return (userPass[0], userPass[1]);
    } catch (e) {
      return null;
    }
  }
}