/**
 * Copyright (c) 2024 Vitor Pamplona
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
 * Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package com.vitorpamplona.quartz.encoders

import com.vitorpamplona.quartz.events.FileHeaderEvent
import java.net.URI
import java.net.URLDecoder
import java.net.URLEncoder
import kotlin.coroutines.cancellation.CancellationException

class Nip54 {
    fun convertFromFileHeader(header: FileHeaderEvent): String? {
        val myUrl = header.url() ?: return null
        return createUrl(
            myUrl,
            header.tags,
        )
    }

    fun createUrl(
        imageUrl: String,
        tags: Array<Array<String>>,
    ): String {
        val extension =
            tags.mapNotNull {
                if (it.isNotEmpty() && it[0] != "url") {
                    if (it.size > 1) {
                        "${it[0]}=${URLEncoder.encode(it[1], "utf-8")}"
                    } else {
                        "${it[0]}}="
                    }
                } else {
                    null
                }
            }.joinToString("&")

        return if (imageUrl.contains("#")) {
            "$imageUrl&$extension"
        } else {
            "$imageUrl#$extension"
        }
    }

    fun parse(url: String): Map<String, String> {
        return try {
            fragments(URI(url))
        } catch (e: Exception) {
            if (e is CancellationException) throw e
            emptyMap()
        }
    }

    private fun fragments(uri: URI): Map<String, String> {
        if (uri.rawFragment == null) return emptyMap()
        return uri.rawFragment.split('&').associate { keyValuePair ->
            val parts = keyValuePair.split('=')
            val name = parts.firstOrNull() ?: ""
            val value = parts.getOrNull(1)?.let { URLDecoder.decode(it, "UTF-8") } ?: ""
            Pair(name, value)
        }
    }
}
