Bimba.git

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package ml.adamsprogs.bimba.api

import android.net.ConnectivityManager
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext
import ml.adamsprogs.bimba.R
import java.io.IOException
import java.io.InputStream
import java.net.HttpURLConnection
import java.net.URL
import java.net.URLEncoder

data class Server(val host: String, val token: String, val feeds: String)

data class Result(val stream: InputStream?, val error: Error?)

data class Error(val statusCode: Int, val stringResource: Int, val imageResource: Int)

@Suppress("BlockingMethodInNonBlockingContext")
suspend fun getFeeds(cm: ConnectivityManager, server: Server): Result {
	return rawRequest(URL("${hostWithScheme(server.host)}/api/"), server, cm)  // todo(error-handling) if is not a valid URL
}

suspend fun queryItems(cm: ConnectivityManager, server: Server, query: String, limit: Int? = null): Result {
	val params = mutableMapOf("q" to query)
	if (limit != null) {
		params["limit"] = limit.toString()
	}
	return request(server, "items", params, cm)
}

suspend fun locateItems(cm:ConnectivityManager, server: Server, plusCode: String): Result {
	return request(server, "items", mapOf("near" to plusCode), cm)
}

suspend fun getDepartures(cm: ConnectivityManager, server: Server, stop: String, line: String? = null): Result {
	val params = mutableMapOf("code" to stop)
	if (line != null) {
		params["line"] = line
	}
	return request(server, "departures", params, cm)
}

@Suppress("BlockingMethodInNonBlockingContext")
suspend fun rawRequest(url: URL, server: Server, cm: ConnectivityManager): Result {
	@Suppress("DEPRECATION")  // fix_later(API_29, API_23) https://developer.android.com/reference/android/net/ConnectivityManager#getActiveNetwork()
	if (cm.activeNetworkInfo == null) {
		// todo check false-positives
		return Result(null, Error(0, R.string.error_offline, R.drawable.error_net))
	}
	return withContext(Dispatchers.IO) {
		val c = (url.openConnection() as HttpURLConnection).apply {
			setRequestProperty("X-Bimba-Token", server.token)
		}
		try {
			if (c.responseCode == 200) {
				Result(c.inputStream, null)
			} else {
				val (string, image) = when (c.responseCode) {
					400 -> Pair(R.string.error_400, R.drawable.error_app)
					401 -> Pair(R.string.error_401, R.drawable.error_sec)
					403 -> Pair(R.string.error_403, R.drawable.error_sec)
					404 -> Pair(
						R.string.error_404,
						R.drawable.error_search
					) // todo check if server returns 404
					429 -> Pair(R.string.error_429, R.drawable.error_limit)
					500 -> Pair(R.string.error_50x, R.drawable.error_server)
					502 -> Pair(R.string.error_50x, R.drawable.error_server)
					503 -> Pair(R.string.error_50x, R.drawable.error_server)
					504 -> Pair(R.string.error_50x, R.drawable.error_server)
					else -> Pair(R.string.error_unknown, R.drawable.error_other)
				}
				Result(c.errorStream, Error(c.responseCode, string, image))
			}
		} catch (e: IOException) {
			Result(null, Error(0, R.string.error_connecting, R.drawable.error_server))
		}
	}
}

@Suppress("BlockingMethodInNonBlockingContext")
suspend fun request(
	server: Server,
	resource: String,
	params: Map<String, String>,
	cm: ConnectivityManager
): Result {
	return withContext(Dispatchers.IO) {
		val url = URL(
			"${hostWithScheme(server.host)}/api/${server.feeds}/$resource${
				params.map {
					"${it.key}=${
						URLEncoder.encode(
							it.value,
							"utf-8"
						)
					}"
				}.joinToString("&", "?")
			}"
		)
		rawRequest(url, server, cm)
	}
}

fun hostWithScheme(host: String): String =
	if (host.startsWith("http://") or host.startsWith("https://")) {
		host
	} else {
		"https://$host"
	}