/*
 * Copyright © Ricki Hirner (bitfire web engineering).
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 */

package at.bitfire.dav4android

import okhttp3.HttpUrl
import java.net.URI
import java.net.URISyntaxException

object UrlUtils {

    fun equals(url1: HttpUrl, url2: HttpUrl): Boolean {
        // if okhttp thinks the two URLs are equal, they're in any case
        // (and it's a simple String comparison)
        if (url1 == url2)
            return true

        val uri1 = url1.uri()
        val uri2 = url2.uri()
        try {
            val decoded1 = URI(uri1.scheme, uri1.schemeSpecificPart, uri1.fragment)
            val decoded2 = URI (uri2.scheme, uri2.schemeSpecificPart, uri2.fragment)
            return decoded1 == decoded2
        } catch (e: URISyntaxException) {
            return false
        }
    }

    fun hostToDomain(host: String?): String? {
        if (host == null)
            return null

        // remove optional dot at end
        @Suppress("NAME_SHADOWING")
        val host = host.removeSuffix(".")

        // split into labels
        val labels = host.split('.')
        return if (labels.size >= 2) {
            labels[labels.size - 2] + "." + labels[labels.size - 1]
        } else
            host
    }

    fun omitTrailingSlash(url: HttpUrl): HttpUrl {
        val idxLast = url.pathSize () - 1
        val hasTrailingSlash = url.pathSegments()[idxLast] == ""

        return if (hasTrailingSlash)
            url.newBuilder().removePathSegment(idxLast).build()
        else
            url
    }

    fun withTrailingSlash(url: HttpUrl): HttpUrl {
        val idxLast = url.pathSize() - 1
        val hasTrailingSlash = url.pathSegments()[idxLast] == ""

        return if (hasTrailingSlash)
            url
        else
            url.newBuilder().addPathSegment("").build()
    }

}