// ignore_for_file: avoid_print

import 'dart:io';

import 'package:refilc/api/providers/database_provider.dart';
import 'package:refilc/database/struct.dart';
import 'package:refilc/models/settings.dart';
import 'package:flutter/foundation.dart';
// ignore: depend_on_referenced_packages
import 'package:sqflite_common_ffi/sqflite_ffi.dart';
import 'package:sqflite_common_ffi_web/sqflite_ffi_web.dart';

const settingsDB = DatabaseStruct("settings", {
  "language": String, "start_page": int, "rounding": int, "theme": int,
  "accent_color": int, "news": int, "seen_news": String,
  "developer_mode": int,
  "update_channel": int, "config": String, "custom_accent_color": int,
  "custom_background_color": int, "custom_highlight_color": int,
  "custom_icon_color": int, "shadow_effect": int, // general
  "grade_color1": int, "grade_color2": int, "grade_color3": int,
  "grade_color4": int, "grade_color5": int, // grade colors
  "vibration_strength": int, "ab_weeks": int, "swap_ab_weeks": int,
  "notifications": int, "notifications_bitfield": int,
  "notification_poll_interval": int,
  "notifications_grades": int,
  "notifications_absences": int,
  "notifications_messages": int,
  "notifications_lessons": int, // notifications
  "x_filc_id": String, "graph_class_avg": int, "presentation_mode": int,
  "bell_delay": int, "bell_delay_enabled": int,
  "grade_opening_fun": int, "icon_pack": String, "premium_scopes": String,
  "premium_token": String, "premium_login": String,
  "last_account_id": String, "renamed_subjects_enabled": int,
  "renamed_subjects_italics": int, "renamed_teachers_enabled": int,
  "renamed_teachers_italics": int,
  "live_activity_color": String,
  "welcome_message": String, "app_icon": String,
  // paints
  "current_theme_id": String, "current_theme_display_name": String,
  "current_theme_creator": String,
  // pinned settings
  "general_s_pin": String, "personalize_s_pin": String,
  "notify_s_pin": String, "extras_s_pin": String,
  // more
  "show_breaks": int,
  "font_family": String,
});
// DON'T FORGET TO UPDATE DEFAULT VALUES IN `initDB` MIGRATION OR ELSE PARENTS WILL COMPLAIN ABOUT THEIR CHILDREN MISSING
// YOU'VE BEEN WARNED!!!
const usersDB = DatabaseStruct("users", {
  "id": String, "name": String, "username": String, "password": String,
  "institute_code": String, "student": String, "role": int,
  "nickname": String, "picture": String // premium only
});
const userDataDB = DatabaseStruct("user_data", {
  "id": String, "grades": String, "timetable": String, "exams": String,
  "homework": String, "messages": String, "recipients": String, "notes": String,
  "events": String, "absences": String, "group_averages": String,
  // renamed subjects // non kreta data
  "renamed_subjects": String,
  // renamed teachers // non kreta data
  "renamed_teachers": String,
  // "subject_lesson_count": String, // non kreta data
  "last_seen_grade": int,
  // goal planning // non kreta data
  "goal_plans": String,
  "goal_averages": String,
  "goal_befores": String,
  "goal_pin_dates": String,
  // todo and notes
  "todo_items": String, "self_notes": String,
  // v5 shit
  "roundings": String,
  "grade_rarities": String,
  "linked_accounts": String,
});

Future<void> createTable(Database db, DatabaseStruct struct) =>
    db.execute("CREATE TABLE IF NOT EXISTS ${struct.table} ($struct)");

Future<Database> initDB(DatabaseProvider database) async {
  Database db;

  if (kIsWeb) {
    db = await databaseFactoryFfiWeb.openDatabase("app.db");
  } else if (Platform.isLinux || Platform.isWindows) {
    sqfliteFfiInit();
    db = await databaseFactoryFfi.openDatabase("app.db");
  } else {
    db = await openDatabase("app.db");
  }

  await createTable(db, settingsDB);
  await createTable(db, usersDB);
  await createTable(db, userDataDB);

  if ((await db.rawQuery("SELECT COUNT(*) FROM settings"))[0].values.first ==
      0) {
    // Set default values for table Settings
    await db.insert("settings",
        SettingsProvider.defaultSettings(database: database).toMap());
  }

  // Migrate Databases
  try {
    await migrateDB(
      db,
      struct: settingsDB,
      defaultValues:
          SettingsProvider.defaultSettings(database: database).toMap(),
    );
    await migrateDB(
      db,
      struct: usersDB,
      defaultValues: {"role": 0, "nickname": "", "picture": ""},
    );
    await migrateDB(db, struct: userDataDB, defaultValues: {
      "grades": "[]", "timetable": "[]", "exams": "[]", "homework": "[]",
      "messages": "[]", "recipients": "[]", "notes": "[]", "events": "[]",
      "absences": "[]",
      "group_averages": "[]",
      // renamed subjects // non kreta data
      "renamed_subjects": "{}",
      // renamed teachers // non kreta data
      "renamed_teachers": "{}",
      // "subject_lesson_count": "{}", // non kreta data
      "last_seen_grade": 0,
      // goal planning // non kreta data
      "goal_plans": "{}",
      "goal_averages": "{}",
      "goal_befores": "{}",
      "goal_pin_dates": "{}",
      // todo and notes
      "todo_items": "{}", "self_notes": "[]",
      // v5 shit
      "roundings": "{}",
      "grade_rarities": "{}",
      "linked_accounts": "{}",
    });
  } catch (error) {
    print("ERROR: migrateDB: $error");
  }

  return db;
}

Future<void> migrateDB(
  Database db, {
  required DatabaseStruct struct,
  required Map<String, Object?> defaultValues,
}) async {
  var originalRows = await db.query(struct.table);

  if (originalRows.isEmpty) {
    await db.execute("drop table ${struct.table}");
    await createTable(db, struct);
    return;
  }

  List<Map<String, dynamic>> migrated = [];

  // go through each row and add missing keys or delete non existing keys
  await Future.forEach<Map<String, Object?>>(originalRows, (original) async {
    bool migrationRequired = struct.struct.keys.any(
            (key) => !original.containsKey(key) || original[key] == null) ||
        original.keys.any((key) => !struct.struct.containsKey(key));

    if (migrationRequired) {
      print("INFO: Migrating ${struct.table}");
      var copy = Map<String, Object?>.from(original);

      // Fill missing columns
      for (var key in struct.struct.keys) {
        if (!original.containsKey(key) || original[key] == null) {
          print("DEBUG: migrating $key");
          copy[key] = defaultValues[key];
        }
      }

      for (var key in original.keys) {
        if (!struct.struct.keys.contains(key)) {
          print("DEBUG: dropping $key");
          copy.remove(key);
        }
      }

      migrated.add(copy);
    }
  });

  // replace the old table with the migrated one
  if (migrated.isNotEmpty) {
    // Delete table
    await db.execute("drop table ${struct.table}");

    // Recreate table
    await createTable(db, struct);
    await Future.forEach(migrated, (Map<String, Object?> copy) async {
      await db.insert(struct.table, copy);
    });

    print("INFO: Database migrated");
  }
}