import 'dart:convert';
import 'dart:io';

import 'package:flutter/foundation.dart';
import 'package:http/http.dart' as http;
import 'package:logging/logging.dart';
import 'package:path_provider/path_provider.dart'; // For cache storage

import 'sheet.dart';

class ApiClient {
  final log = Logger("ApiClient");
  final String baseUrl;
  String? token;

  ApiClient({required this.baseUrl, this.token});

  Future<void> login(String username, String password) async {
    log.info("Logging in...");
    final url = '$baseUrl/login';
    final response = await http.post(
      Uri.parse(url),
      headers: {'Content-Type': 'application/json'},
      body: jsonEncode({'email': username, 'password': password}),
    );

    if (response.statusCode == 200) {
      token = jsonDecode(response.body);
      log.info('Login successful');
    } else {
      throw Exception(
        "Failed logging in: Response code ${response.statusCode}\nResponse: ${response.body}",
      );
    }
  }

  void logout() {
    token = null;
    log.info('Logged out successfully.');
  }

  Future<http.Response> get(
    String endpoint, {
    bool isBinary = false,
    bool throwExceptionIfStatusCodeNot200 = false,
  }) async {
    final url = '$baseUrl$endpoint';
    final headers = {
      'Authorization': 'Bearer $token',
      if (!isBinary) 'Content-Type': 'application/json',
    };

    final response = await http.get(Uri.parse(url), headers: headers);

    if (!throwExceptionIfStatusCodeNot200 || response.statusCode == 200) {
      return response;
    } else {
      throw Exception(
        'GET request failed: ${response.statusCode} ${response.body}',
      );
    }
  }

  Future<http.Response?> post(
    String endpoint,
    Map<String, dynamic> body,
  ) async {
    try {
      final url = '$baseUrl$endpoint';
      final headers = {
        'Authorization': 'Bearer $token',
        'Content-Type': 'application/json',
      };

      final response = await http.post(
        Uri.parse(url),
        headers: headers,
        body: jsonEncode(body),
      );

      if (response.statusCode == 200 || response.statusCode == 201) {
        return response;
      } else {
        log.info(
          'POST request failed: ${response.statusCode} ${response.body}',
        );
      }
    } catch (e) {
      log.info('Error during POST request: $e');
    }
    return null;
  }

  Future<http.Response?> postFormData(String endpoint, String body) async {
    try {
      final url = '$baseUrl$endpoint';
      final headers = {
        'Authorization': 'Bearer $token',
        'Content-Type': 'application/x-www-form-urlencoded',
      };

      final response = await http.post(
        Uri.parse(url),
        headers: headers,
        body: body,
      );

      if (response.statusCode == 200 || response.statusCode == 201) {
        return response;
      } else {
        log.info(
          'POST Form Data request failed: ${response.statusCode} ${response.body}',
        );
      }
    } catch (e) {
      log.info('Error during POST Form Data request: $e');
    }
    return null;
  }

  Future<List<Sheet>> fetchSheets() async {
    final response = await get(
      "/list/sheets",
      throwExceptionIfStatusCodeNot200: true,
    );

    final data = jsonDecode(response.body);
    return (data as List<dynamic>)
        .map((sheet) => Sheet.fromJson(sheet as Map<String, dynamic>))
        .toList();
  }

  Future<Uint8List> fetchPdfFileData(String sheetUuid) async {
    final response = await get(
      '/sheet/pdf/$sheetUuid',
      isBinary: true,
      throwExceptionIfStatusCodeNot200: true,
    );

    log.info("PDF downloaded");
    return response.bodyBytes;
  }

  Future<File> getPdfFileCached(String sheetUuid) async {
    final cacheDir = await getTemporaryDirectory();
    final cachedPdfPath = '${cacheDir.path}/$sheetUuid.pdf';

    final cachedFile = File(cachedPdfPath);
    if (await cachedFile.exists()) {
      log.info("PDF found in cache: $cachedPdfPath");
      return cachedFile;
    }

    final pdfFileData = await fetchPdfFileData(sheetUuid);
    await cachedFile.writeAsBytes(pdfFileData);
    log.info("PDF cached at: $cachedPdfPath");
    return cachedFile;
  }
}