Bimba.git

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// SPDX-FileCopyrightText: Adam Evyčędo
//
// SPDX-License-Identifier: GPL-3.0-or-later

package xyz.apiote.bimba.czwek.repo

import android.content.Context
import android.database.sqlite.SQLiteDatabase
import androidx.core.content.edit
import androidx.core.database.sqlite.transaction
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext
import xyz.apiote.bimba.czwek.api.Server
import xyz.apiote.fruchtfleisch.Reader
import xyz.apiote.fruchtfleisch.Writer
import java.io.File
import java.net.URLEncoder
import java.time.LocalDate

class OfflineRepository(context: Context) : Repository {
	private val db =
		SQLiteDatabase.openOrCreateDatabase(context.getDatabasePath("favourites").path, null)

	fun saveFeedCache(context: Context, feedInfos: Map<String, FeedInfo>) {
		val file = File(
			context.filesDir, URLEncoder.encode(Server.get(context).apiPath, "utf-8")
		)
		context.getSharedPreferences("offlineFeeds", Context.MODE_PRIVATE).edit {
			putInt("version", FeedInfo.VERSION.toInt())
		}
		val stream = file.outputStream()
		val writer = Writer(stream)
		writer.writeUInt(feedInfos.size.toULong())
		feedInfos.forEach {
			it.value.marshal(stream)
		}
		stream.flush()
		stream.close()
	}

	override suspend fun getFavourite(stopCode: String): Favourite? {
		val cursor =
			db.rawQuery(
				"select sequence, stop_name, feed_id, feed_name, lines from favourites where stop_code = ?",
				listOf(stopCode).toTypedArray()
			)
		if (cursor.count == 0) {
			return null
		}
		cursor.moveToNext()
		val f = Favourite(
			cursor.getInt(0),
			cursor.getString(2),
			cursor.getString(3),
			stopCode,
			cursor.getString(1),
			cursor.getString(4).split("||").filter { it != "" }
		)
		cursor.close()
		return f
	}

	override suspend fun getFavourites(feedIDs: Set<String>): List<Favourite> {
		val whereClause = if (feedIDs.isNotEmpty()) {
			feedIDs.indices.joinToString(prefix = "where feed_id in (", postfix = ")") { "?" }
		} else {
			""
		}
		val cursor =
			db.rawQuery(
				"select sequence, stop_name, feed_id, feed_name, stop_code, lines from favourites $whereClause order by sequence",
				feedIDs.toTypedArray()
			)
		val l = mutableListOf<Favourite>()
		while (cursor.moveToNext()) {
			l.add(
				Favourite(
					cursor.getInt(0),
					cursor.getString(2),
					cursor.getString(3),
					cursor.getString(4),
					cursor.getString(1),
					cursor.getString(5).split("||").filter { it != "" }
				)
			)
		}
		cursor.close()
		return l
	}

	override suspend fun saveFavourite(favourite: Favourite) {
		val sequence = favourite.sequence ?: run {
			val cursor =
				db.rawQuery("select max(ROWID) from favourites", emptyArray<String?>())
			val s = if (cursor.count == 0) {
				0
			} else {
				cursor.moveToNext()
				cursor.getInt(0)
			}
			cursor.close()
			s
		}
		db.execSQL(
			"insert into favourites(sequence, feed_id, feed_name, stop_code, stop_name, lines) values (?, ?,?,?,?,?) on conflict(feed_id, stop_code) do update set stop_name = ?, lines = ?, sequence = ?",
			arrayOf(
				sequence,
				favourite.feedID,
				favourite.feedName,
				favourite.stopCode,
				favourite.stopName,
				favourite.lines.joinToString(separator = "||"),
				favourite.stopName,
				favourite.lines.joinToString(separator = "||"),
				favourite.sequence
			)
		)
	}

	override suspend fun saveFavourites(favourites: Set<Favourite>) {
		db.execSQL("delete from favourites")
		db.transaction {
			favourites.forEach {
				saveFavourite(it)
			}
		}
	}

	@Suppress("RedundantNullableReturnType")
	override suspend fun getFeeds(
		context: Context,
		server: Server
	): Map<String, FeedInfo>? {
		val file = File(
			context.filesDir, withContext(Dispatchers.IO) {
				URLEncoder.encode(server.apiPath, "utf-8")
			}
		)
		if (!file.exists()) {
			return emptyMap()
		}

		val version =
			context.getSharedPreferences("offlineFeeds", Context.MODE_PRIVATE).getInt("version", -1)
		if (version < 0) {
			return emptyMap()
		}
		val unmarshaller =
			if (version.toUInt() == FeedInfo.VERSION) FeedInfo::unmarshal else FeedInfoPrev::unmarshal
		val stream = file.inputStream()
		val feeds = mutableMapOf<String, FeedInfo>()
		val n = Reader(stream).readUInt().toULong().toInt()
		repeat(n) {
			val feed = unmarshaller(stream)
			feeds[feed.id] = feed
			if (version.toUInt() != FeedInfo.VERSION) {
				saveFeedCache(context, feeds)
			}
		}
		return feeds
	}

	override suspend fun getDepartures(
		feedID: String,
		stop: String,
		date: LocalDate?,
		context: Context,
		limit: Int?
	): StopDepartures? {
		TODO("Not yet implemented")
	}

	override suspend fun getLocatablesIn(
		context: Context,
		bl: Position,
		tr: Position,
	): List<Locatable>? {
		TODO("Not yet implemented")
	}

	override suspend fun getLine(
		context: Context,
		feedID: String,
		lineName: String,
		lineID: String,
	): Line? {
		TODO("Not yet implemented")
	}

	override suspend fun queryQueryables(
		query: String,
		context: Context
	): List<Queryable>? {
		TODO("Not yet implemented")
	}

	override suspend fun locateQueryables(
		position: Position,
		context: Context
	): List<Queryable>? {
		TODO("Not yet implemented")
	}

	fun close() {
		db.close()
	}
}


fun migrateDB(context: Context) {
	val db = SQLiteDatabase.openOrCreateDatabase(context.getDatabasePath("favourites").path, null)
	db.execSQL("create table if not exists favourites(sequence integer, feed_id text, feed_name text, stop_code text, stop_name text, lines text, primary key(feed_id, stop_code))")
}