import 'package:drift/drift.dart';
import 'package:drift/native.dart';
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart' as p;
import 'dart:io';

part 'database.g.dart';

// Exercises
class Exercises extends Table {
  TextColumn get id => text()();
  TextColumn get name => text()();
  TextColumn get instructions => text().nullable()();
  TextColumn get enrichment => text().nullable()();
  TextColumn get tags => text().nullable()(); // JSON string
  TextColumn get videoUrl => text().nullable()();

  @override
  Set<Column> get primaryKey => {id};
}

// TrainingPlans
class TrainingPlans extends Table {
  TextColumn get id => text()();
  TextColumn get name => text()();
  TextColumn get sections => text().nullable()(); // JSON string

  @override
  Set<Column> get primaryKey => {id};
}

// Programs
class Programs extends Table {
  TextColumn get id => text()();
  TextColumn get name => text()();
  TextColumn get createdAt => text()();

  @override
  Set<Column> get primaryKey => {id};
}

// ProgramWeeks
class ProgramWeeks extends Table {
  TextColumn get id => text()();
  TextColumn get programId =>
      text().references(Programs, #id, onDelete: KeyAction.cascade)();
  IntColumn get position => integer()();
  TextColumn get notes => text().nullable()();

  @override
  Set<Column> get primaryKey => {id};
}

// ProgramWorkouts
class ProgramWorkouts extends Table {
  TextColumn get id => text()();
  TextColumn get weekId =>
      text().references(ProgramWeeks, #id, onDelete: KeyAction.cascade)();
  TextColumn get programId =>
      text().references(Programs, #id, onDelete: KeyAction.cascade)();
  TextColumn get day => text()();
  TextColumn get type => text()(); // "exercise" | "plan"
  TextColumn get refId => text().nullable()();
  TextColumn get name => text().nullable()();
  TextColumn get description => text().nullable()();
  BoolColumn get completed => boolean().withDefault(const Constant(false))();

  @override
  Set<Column> get primaryKey => {id};
}

// AnalysisSessions
class AnalysisSessions extends Table {
  TextColumn get id => text()();
  TextColumn get name => text()();
  TextColumn get date => text()();
  TextColumn get videoPath => text().nullable()();

  @override
  Set<Column> get primaryKey => {id};
}

// Annotations
class Annotations extends Table {
  TextColumn get id => text()();
  TextColumn get sessionId =>
      text().references(AnalysisSessions, #id, onDelete: KeyAction.cascade)();
  RealColumn get startTime => real()();
  RealColumn get endTime => real()();
  TextColumn get name => text().nullable()();
  TextColumn get description => text().nullable()();
  TextColumn get color => text().nullable()();

  @override
  Set<Column> get primaryKey => {id};
}

// ChatSessions
class ChatSessions extends Table {
  TextColumn get id => text()();
  TextColumn get title => text().nullable()();
  TextColumn get createdAt => text()();
  TextColumn get updatedAt => text()();

  @override
  Set<Column> get primaryKey => {id};
}

// ChatMessages
class ChatMessages extends Table {
  TextColumn get id => text()();
  TextColumn get sessionId =>
      text().references(ChatSessions, #id, onDelete: KeyAction.cascade)();
  TextColumn get role => text()(); // 'user' | 'assistant'
  TextColumn get content => text()();
  TextColumn get createdAt => text()();

  @override
  Set<Column> get primaryKey => {id};
}

@DriftDatabase(
  tables: [
    Exercises,
    TrainingPlans,
    Programs,
    ProgramWeeks,
    ProgramWorkouts,
    AnalysisSessions,
    Annotations,
    ChatSessions,
    ChatMessages,
  ],
)
class AppDatabase extends _$AppDatabase {
  AppDatabase() : super(_openConnection());

  @override
  int get schemaVersion => 1;
}

LazyDatabase _openConnection() {
  return LazyDatabase(() async {
    final dbFolder = await getApplicationDocumentsDirectory();
    final file = File(p.join(dbFolder.path, 'trainhub.sqlite'));
    return NativeDatabase.createInBackground(file);
  });
}