//
//  ProviderBadge.swift
//  Mobile Music Assistant
//
//  Created by Sven Hanold on 06.04.26.
//

import SwiftUI

/// Monochrome badges indicating which music provider(s) an item comes from.
/// For provider-specific URIs (e.g. spotify://) a single badge is shown.
/// For library:// items all distinct source providers found in the metadata
/// images are shown side by side.
struct ProviderBadge: View {
    let uri: String
    var metadata: MediaItemMetadata? = nil

    private var providers: [MusicProvider] {
        // Use string-based parsing — URL(string:) returns nil for schemes with
        // underscores like "apple_music" which violate RFC 2396.
        let scheme = uri.components(separatedBy: "://").first?.lowercased()

        // Non-library URI → show only that provider
        if let fromScheme = MusicProvider.from(scheme: scheme), fromScheme != .library {
            return [fromScheme]
        }

        // library:// URI → collect all distinct providers from metadata images
        var seen = Set<MusicProvider>()
        var result = [MusicProvider]()

        let keys = metadata?.images?.compactMap { $0.provider } ?? []
        for key in keys {
            if let p = MusicProvider.from(providerKey: key), !seen.contains(p) {
                seen.insert(p)
                result.append(p)
            }
        }

        // Nothing found for a library item → fall back to the library badge
        if result.isEmpty && scheme == "library" {
            return [.library]
        }

        return result
    }

    var body: some View {
        HStack(spacing: 4) {
            ForEach(providers, id: \.self) { provider in
                Image(systemName: provider.icon)
                    .font(.system(size: 9, weight: .bold))
                    .foregroundStyle(.white)
                    .frame(width: 20, height: 20)
                    .background(.black.opacity(0.55))
                    .clipShape(Circle())
            }
        }
    }
}

// MARK: - Provider Mapping

enum MusicProvider: Hashable {
    case library
    case subsonic
    case spotify
    case tidal
    case qobuz
    case plex
    case ytmusic
    case appleMusic
    case deezer
    case soundcloud
    case tunein
    case filesystem
    case jellyfin
    case dlna

    /// SF Symbol name for this provider.
    var icon: String {
        switch self {
        case .library:     return "building.columns.fill"
        case .subsonic:    return "ferry.fill"
        case .spotify:     return "antenna.radiowaves.left.and.right.circle.fill"
        case .tidal:       return "water.waves"
        case .qobuz:       return "hifispeaker.fill"
        case .plex:        return "play.square.stack.fill"
        case .ytmusic:     return "play.rectangle.fill"
        case .appleMusic:  return "applelogo"
        case .deezer:      return "waveform"
        case .soundcloud:  return "cloud.fill"
        case .tunein:      return "radio.fill"
        case .filesystem:  return "folder.fill"
        case .jellyfin:    return "server.rack"
        case .dlna:        return "wifi"
        }
    }

    /// Match a URI scheme to a known provider.
    static func from(scheme: String?) -> MusicProvider? {
        guard let scheme = scheme?.lowercased() else { return nil }

        if scheme == "library"               { return .library }
        if scheme.hasPrefix("subsonic")      { return .subsonic }
        if scheme.hasPrefix("spotify")       { return .spotify }
        if scheme.hasPrefix("tidal")         { return .tidal }
        if scheme.hasPrefix("qobuz")         { return .qobuz }
        if scheme.hasPrefix("plex")          { return .plex }
        if scheme.hasPrefix("ytmusic")       { return .ytmusic }
        if scheme.hasPrefix("apple")         { return .appleMusic }
        if scheme.hasPrefix("deezer")        { return .deezer }
        if scheme.hasPrefix("soundcloud")    { return .soundcloud }
        if scheme.hasPrefix("tunein")        { return .tunein }
        if scheme.hasPrefix("filesystem")    { return .filesystem }
        if scheme.hasPrefix("jellyfin")      { return .jellyfin }
        if scheme.hasPrefix("dlna")          { return .dlna }

        return nil
    }

    /// Match a provider key from image metadata (e.g. "subsonic", "spotify", "filesystem_local").
    static func from(providerKey key: String) -> MusicProvider? {
        let k = key.lowercased()

        if k.hasPrefix("subsonic")    { return .subsonic }
        if k.hasPrefix("spotify")     { return .spotify }
        if k.hasPrefix("tidal")       { return .tidal }
        if k.hasPrefix("qobuz")       { return .qobuz }
        if k.hasPrefix("plex")        { return .plex }
        if k.hasPrefix("ytmusic")     { return .ytmusic }
        if k.hasPrefix("apple")       { return .appleMusic }
        if k.hasPrefix("deezer")      { return .deezer }
        if k.hasPrefix("soundcloud")  { return .soundcloud }
        if k.hasPrefix("tunein")      { return .tunein }
        if k.hasPrefix("filesystem")  { return .filesystem }
        if k.hasPrefix("jellyfin")    { return .jellyfin }
        if k.hasPrefix("dlna")        { return .dlna }
        // Image-only metadata providers — not a music source
        if k == "lastfm" || k == "musicbrainz" || k == "fanarttv" { return nil }

        return nil
    }
}