// lib/services/saha/saha_service.dart
//
// Small client for the panel's `/delphi/my-forms` endpoint. Used from the
// home explore state to decide whether to render a Saha section (and to seed
// it with one card per panel). The card tap opens the existing `/saha`
// WebView page on the panel origin.

import 'dart:async';
import 'dart:convert';
import 'dart:io' show SocketException;

import 'package:flutter/foundation.dart' show debugPrint;

// ignore: depend_on_referenced_packages
import 'package:http/http.dart' as http;

import 'package:didvan/config/auth_config.dart';
import 'package:didvan/services/auth/token_storage.dart';

class SahaPanel {
  final String id;
  final String title;
  final String? description;
  final String? type;

  const SahaPanel({
    required this.id,
    required this.title,
    this.description,
    this.type,
  });

  factory SahaPanel.fromJson(Map<String, dynamic> json) => SahaPanel(
        id: json['id'] as String,
        title: (json['title'] ?? '') as String,
        description: json['description'] as String?,
        type: json['type'] as String?,
      );
}

class SahaService {
  SahaService._();
  static final SahaService instance = SahaService._();

  static const _timeout = Duration(seconds: 15);
  String get _base => AuthConfig.apiBaseUrl;

  Future<List<SahaPanel>> fetchMyPanels() async {
    final token = TokenStorage.accessToken;
    if (token == null || token.isEmpty) {
      debugPrint('🗳️ SAHA: no access token in TokenStorage');
      return [];
    }
    try {
      final res = await http.get(
        Uri.parse('$_base/delphi/my-forms'),
        headers: {
          'Accept': 'application/json',
          'Authorization': 'Bearer $token',
        },
      ).timeout(_timeout);
      if (res.statusCode != 200) {
        final body = res.body.length > 300 ? res.body.substring(0, 300) : res.body;
        debugPrint('🗳️ SAHA: my-forms HTTP ${res.statusCode}: $body');
        return [];
      }
      final decoded = json.decode(res.body);
      if (decoded is List) {
        return decoded
            .whereType<Map>()
            .map((m) => SahaPanel.fromJson(Map<String, dynamic>.from(m)))
            .toList();
      }
      debugPrint('🗳️ SAHA: my-forms returned non-list payload: '
          '${res.body.length > 300 ? res.body.substring(0, 300) : res.body}');
      return [];
    } on TimeoutException {
      debugPrint('🗳️ SAHA: my-forms timed out');
      return [];
    } on SocketException catch (e) {
      debugPrint('🗳️ SAHA: my-forms network error: $e');
      return [];
    } catch (e) {
      debugPrint('🗳️ SAHA: fetchMyPanels error: $e');
      return [];
    }
  }

  /// Signs a magic-link invite token for the current Keycloak user on a
  /// specific panel and returns the ready-to-open respondent URL, or null
  /// on failure. The URL points at the panel origin so `Routes.web` can
  /// open it in the cookie-injecting WebView.
  Future<String?> buildMyPanelUrl(String panelId) async {
    final token = TokenStorage.accessToken;
    if (token == null || token.isEmpty) {
      debugPrint('🗳️ SAHA: my-link no access token');
      return null;
    }
    try {
      final res = await http.post(
        Uri.parse('$_base/delphi/forms/$panelId/my-link'),
        headers: {
          'Accept': 'application/json',
          'Authorization': 'Bearer $token',
        },
      ).timeout(_timeout);
      if (res.statusCode != 200 && res.statusCode != 201) {
        final body = res.body.length > 300 ? res.body.substring(0, 300) : res.body;
        debugPrint('🗳️ SAHA: my-link HTTP ${res.statusCode}: $body');
        return null;
      }
      final decoded = json.decode(res.body);
      if (decoded is! Map || decoded['token'] is! String) {
        debugPrint('🗳️ SAHA: my-link bad payload: ${res.body}');
        return null;
      }
      final t = Uri.encodeComponent(decoded['token'] as String);
      return 'https://app.didvan.com/panel/delphi/forms/user/$panelId?token=$t';
    } on TimeoutException {
      debugPrint('🗳️ SAHA: my-link timed out');
      return null;
    } on SocketException catch (e) {
      debugPrint('🗳️ SAHA: my-link network error: $e');
      return null;
    } catch (e) {
      debugPrint('🗳️ SAHA: buildMyPanelUrl error: $e');
      return null;
    }
  }
}