import 'dart:io';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:path_provider/path_provider.dart';
import 'package:share_plus/share_plus.dart';
import 'package:drift/drift.dart' hide DatabaseConnectionUser;
import '../database/database.dart';

class ExportService {
  final AppDatabase _db;

  ExportService(this._db);

  Future<void> exportRide(int rideId, {bool asGpx = true}) async {
    final telemetry = await (_db.select(_db.telemetrySamples)
      ..where((t) => t.rideId.equals(rideId))
      ..orderBy([(t) => OrderingTerm(expression: t.timestamp)])
    ).get();

    if (telemetry.isEmpty) return;

    final dir = await getTemporaryDirectory();
    
    if (asGpx) {
      final file = File('${dir.path}/ride_$rideId.gpx');
      await file.writeAsString(_generateGpx(telemetry));
      // ignore: deprecated_member_use
      await Share.shareXFiles([XFile(file.path)], text: 'My Motorcycle Ride (GPX)');
    } else {
      final file = File('${dir.path}/ride_$rideId.csv');
      await file.writeAsString(_generateCsv(telemetry));
      // ignore: deprecated_member_use
      await Share.shareXFiles([XFile(file.path)], text: 'My Motorcycle Ride (CSV)');
    }
  }

  String _generateGpx(List<TelemetrySample> telemetry) {
    final sb = StringBuffer();
    sb.writeln('<?xml version="1.0" encoding="UTF-8"?>');
    sb.writeln('<gpx version="1.1" creator="MotorcycleDash">');
    sb.writeln('  <trk>');
    sb.writeln('    <name>Ride</name>');
    sb.writeln('    <trkseg>');
    for (final t in telemetry) {
      if (t.latitude != null && t.longitude != null) {
        sb.writeln('      <trkpt lat="${t.latitude}" lon="${t.longitude}">');
        if (t.altitude != null) {
          sb.writeln('        <ele>${t.altitude}</ele>');
        }
        sb.writeln('        <time>${t.timestamp.toUtc().toIso8601String()}</time>');
        // Extend GPX with our custom data
        sb.writeln('        <extensions>');
        sb.writeln('          <speed>${t.speed ?? 0}</speed>');
        sb.writeln('          <heading>${t.heading ?? 0}</heading>');
        sb.writeln('          <lean>${t.leanAngle ?? 0}</lean>');
        sb.writeln('          <longitudinalG>${t.longitudinalG ?? 0}</longitudinalG>');
        sb.writeln('          <lateralG>${t.lateralG ?? 0}</lateralG>');
        sb.writeln('        </extensions>');
        sb.writeln('      </trkpt>');
      }
    }
    sb.writeln('    </trkseg>');
    sb.writeln('  </trk>');
    sb.writeln('</gpx>');
    return sb.toString();
  }

  String _generateCsv(List<TelemetrySample> telemetry) {
    final sb = StringBuffer();
    sb.writeln('timestamp,latitude,longitude,altitude,speed,heading,gpsAccuracy,leanAngle,pitchAngle,accelX,accelY,accelZ,longitudinalG,lateralG');
    for (final t in telemetry) {
      sb.writeln('${t.timestamp.toIso8601String()},${t.latitude ?? ""},${t.longitude ?? ""},${t.altitude ?? ""},${t.speed ?? ""},${t.heading ?? ""},${t.gpsAccuracy ?? ""},${t.leanAngle ?? ""},${t.pitchAngle ?? ""},${t.accelX ?? ""},${t.accelY ?? ""},${t.accelZ ?? ""},${t.longitudinalG ?? ""},${t.lateralG ?? ""}');
    }
    return sb.toString();
  }
}

final exportServiceProvider = Provider<ExportService>((ref) {
  final db = ref.watch(databaseProvider);
  return ExportService(db);
});