package io.oxygenhub.android.ui.nav

import java.net.URI

/**

 * The app's own screen for a page of the hub (Andy, 2026-10-25: whatever

 * is tapped in the inbox opens natively): an issue, proposal, run, change,

 * file, history, board, repository, account or organisation. Null for a page the app does not

 * show itself, or another site's, which the browser opens.

 */

fun routeFor(url: String, hub: String): Any? {

    val u = runCatching { URI(url) }.getOrNull() ?: return null

    val home = runCatching { URI(hub) }.getOrNull() ?: return null

    if (u.host != null && !u.host.equals(home.host, ignoreCase = true)) return null

    val parts = (u.rawPath ?: "").split('/').filter { it.isNotEmpty() }.map { java.net.URLDecoder.decode(it, "UTF-8") }

    if (parts.size >= 3 && parts[0] == "projects") {

        return parts[2].toLongOrNull()?.let { BoardRoute(parts[1], it) }

    }

    if (parts.size == 2 && parts[0] == "orgs") return OwnerRoute(parts[1])

    if (parts.size == 1 && parts[0] !in HUB_PAGES) return OwnerRoute(parts[0])

    if (parts.size < 2 || parts[0] in HUB_PAGES) return null

    val (owner, name) = parts[0] to parts[1]

    val rest = parts.drop(2)

    return when (rest.firstOrNull()) {

        null -> IssuesRoute(owner, name)

        "issue" -> rest.getOrNull(1)?.toLongOrNull()?.let { IssueRoute(owner, name, it) }

        "proposal" -> rest.getOrNull(1)?.toLongOrNull()?.let { ProposalRoute(owner, name, it) }

        "flow" -> rest.getOrNull(1)?.toLongOrNull()?.let { RunRoute(owner, name, it) }

        "change" -> rest.getOrNull(1)?.let { ChangeRoute(owner, name, it) }

        "file" -> if (rest.size >= 3) FileRoute(owner, name, rest[1], rest.drop(2).joinToString("/")) else null

        "changes" -> rest.getOrNull(1)?.let { HistoryRoute(owner, name, it) }

        else -> null

    }

}

/** The hub's own top-level pages: never an owner's name. */

private val HUB_PAGES = setOf(

    "about", "admin", "api", "apt", "avatar", "device", "drops", "explore", "health", "help", "insights", "live", "log",

    "login", "logout", "metrics", "new", "notifications", "orgs", "register", "search", "security-contact", "settings",

    "sky", "static", "verify", ".well-known",

)