//
//  SearchView.swift
//  Mobile Music Assistant
//
//  Created by Sven Hanold on 26.03.26.
//

import SwiftUI

struct SearchView: View {
    @Environment(MAService.self) private var service
    @Environment(\.dismiss) private var dismiss
    
    @State private var searchText = ""
    @State private var searchResults: [MAMediaItem] = []
    @State private var isSearching = false
    @State private var errorMessage: String?
    @State private var showError = false
    
    // Debounce timer
    @State private var searchTask: Task<Void, Never>?
    
    var body: some View {
        Group {
            if searchResults.isEmpty && !isSearching {
                if searchText.isEmpty {
                    ContentUnavailableView(
                        "Search Library",
                        systemImage: "magnifyingglass",
                        description: Text("Find artists, albums, tracks, and playlists")
                    )
                } else {
                    ContentUnavailableView(
                        "No Results",
                        systemImage: "magnifyingglass",
                        description: Text("No results found for '\(searchText)'")
                    )
                }
            } else if isSearching {
                ProgressView()
            } else {
                searchResultsList
            }
        }
        .navigationTitle("Search")
        .navigationBarTitleDisplayMode(.inline)
        .toolbar {
            ToolbarItem(placement: .cancellationAction) {
                Button("Cancel") { dismiss() }
            }
        }
        .withMANavigation()
        .searchable(text: $searchText, prompt: "Artists, albums, tracks...")
        .onChange(of: searchText) { _, newValue in
            performSearch(query: newValue)
        }
        .alert("Error", isPresented: $showError) {
            Button("OK", role: .cancel) { }
        } message: {
            if let errorMessage {
                Text(errorMessage)
            }
        }
    }
    
    // MARK: - Search Results List
    
    @ViewBuilder
    private var searchResultsList: some View {
        List {
            // Group results by media type
            let groupedResults = Dictionary(grouping: searchResults) { $0.mediaType ?? .unknown }
            
            // Artists
            if let artists = groupedResults[.artist], !artists.isEmpty {
                Section {
                    ForEach(artists) { item in
                        NavigationLink(value: convertToArtist(item)) {
                            SearchResultRow(item: item)
                        }
                    }
                } header: {
                    Label("Artists", systemImage: "music.mic")
                        .font(.headline)
                        .foregroundStyle(.primary)
                }
            }
            
            // Albums
            if let albums = groupedResults[.album], !albums.isEmpty {
                Section {
                    ForEach(albums) { item in
                        NavigationLink(value: convertToAlbum(item)) {
                            SearchResultRow(item: item)
                        }
                    }
                } header: {
                    Label("Albums", systemImage: "opticaldisc")
                        .font(.headline)
                        .foregroundStyle(.primary)
                }
            }
            
            // Tracks
            if let tracks = groupedResults[.track], !tracks.isEmpty {
                Section {
                    ForEach(tracks) { item in
                        SearchResultRow(item: item)
                            .contentShape(Rectangle())
                            .onTapGesture {
                                print("🎵 Tapped track: \(item.name)")
                                // TODO: Play track
                            }
                    }
                } header: {
                    Label("Tracks", systemImage: "music.note")
                        .font(.headline)
                        .foregroundStyle(.primary)
                }
            }
            
            // Playlists
            if let playlists = groupedResults[.playlist], !playlists.isEmpty {
                Section {
                    ForEach(playlists) { item in
                        NavigationLink(value: convertToPlaylist(item)) {
                            SearchResultRow(item: item)
                        }
                    }
                } header: {
                    Label("Playlists", systemImage: "music.note.list")
                        .font(.headline)
                        .foregroundStyle(.primary)
                }
            }
            
            // Podcasts
            if let podcasts = groupedResults[.podcast], !podcasts.isEmpty {
                Section {
                    ForEach(podcasts) { item in
                        NavigationLink(value: convertToPodcast(item)) {
                            SearchResultRow(item: item)
                        }
                    }
                } header: {
                    Label("Podcasts", systemImage: "mic.fill")
                        .font(.headline)
                        .foregroundStyle(.primary)
                }
            }

            // Radios
            if let radios = groupedResults[.radio], !radios.isEmpty {
                Section {
                    ForEach(radios) { item in
                        SearchResultRow(item: item)
                            .contentShape(Rectangle())
                            .onTapGesture {
                                print("📻 Tapped radio: \(item.name)")
                                // TODO: Play radio
                            }
                    }
                } header: {
                    Label("Radio Stations", systemImage: "antenna.radiowaves.left.and.right")
                        .font(.headline)
                        .foregroundStyle(.primary)
                }
            }
        }
        .listStyle(.plain)
    }
    
    // MARK: - Navigation Helper
    
    private func convertToAlbum(_ item: MAMediaItem) -> MAAlbum {
        print("🔄 Converting to album: \(item.name) (URI: \(item.uri))")
        return MAAlbum(
            uri: item.uri,
            name: item.name,
            artists: item.artists,
            imageUrl: item.imageUrl,
            imageProvider: item.imageProvider,
            year: nil
        )
    }
    
    private func convertToPlaylist(_ item: MAMediaItem) -> MAPlaylist {
        return MAPlaylist(
            uri: item.uri,
            name: item.name,
            imageUrl: item.imageUrl
        )
    }

    private func convertToPodcast(_ item: MAMediaItem) -> MAPodcast {
        return MAPodcast(
            uri: item.uri,
            name: item.name,
            publisher: item.artists?.first?.name,
            imageUrl: item.imageUrl
        )
    }

    private func convertToArtist(_ item: MAMediaItem) -> MAArtist {
        print("🔄 Converting to artist: \(item.name) (URI: \(item.uri))")
        
        // If the item itself is an artist, use its data
        if item.mediaType == .artist {
            return MAArtist(
                uri: item.uri,
                name: item.name,
                imageUrl: item.imageUrl,
                imageProvider: item.imageProvider,
                sortName: nil,
                musicbrainzId: nil
            )
        }
        
        // Otherwise try to use the first artist from the artists array
        if let firstArtist = item.artists?.first {
            return firstArtist
        }
        
        // Fallback
        return MAArtist(
            uri: item.uri,
            name: item.name,
            imageUrl: item.imageUrl,
            imageProvider: item.imageProvider,
            sortName: nil,
            musicbrainzId: nil
        )
    }
    
    // MARK: - Search
    
    private func performSearch(query: String) {
        // Cancel previous search
        searchTask?.cancel()
        
        guard !query.isEmpty else {
            searchResults = []
            return
        }
        
        // Debounce search - wait 500ms after user stops typing
        searchTask = Task {
            try? await Task.sleep(for: .milliseconds(500))
            
            guard !Task.isCancelled else { return }
            
            await executeSearch(query: query)
        }
    }
    
    private func executeSearch(query: String) async {
        print("🔍 Starting search for: '\(query)'")
        isSearching = true
        errorMessage = nil
        
        do {
            let results = try await service.libraryManager.search(query: query)
            print("✅ Search returned \(results.count) results")
            
            // Debug: Print first result
            if let first = results.first {
                print("📦 First result: \(first.name) (type: \(first.mediaType?.rawValue ?? "nil"))")
            }
            
            await MainActor.run {
                searchResults = results
                isSearching = false
                print("✅ UI updated with \(searchResults.count) results")
            }
        } catch {
            await MainActor.run {
                errorMessage = error.localizedDescription
                showError = true
                searchResults = []
                isSearching = false
                print("❌ Search Error: \(error)")
            }
        }
    }
}

// MARK: - Search Result Row

struct SearchResultRow: View {
    @Environment(MAService.self) private var service
    let item: MAMediaItem
    
    var body: some View {
        HStack(spacing: 12) {
            // Thumbnail
            CachedAsyncImage(url: service.imageProxyURL(path: item.imageUrl, provider: item.imageProvider, size: 128)) { image in
                image
                    .resizable()
                    .aspectRatio(contentMode: .fill)
            } placeholder: {
                thumbnailShape
                    .fill(Color.gray.opacity(0.2))
                    .overlay {
                        Image(systemName: mediaTypeIcon)
                            .foregroundStyle(.secondary)
                    }
            }
            .frame(width: 60, height: 60)
            .clipShape(thumbnailShape)
            
            // Item Info
            VStack(alignment: .leading, spacing: 4) {
                Text(item.name)
                    .font(.body)
                    .lineLimit(1)
                
                if let artists = item.artists, !artists.isEmpty {
                    Text(artists.map { $0.name }.joined(separator: ", "))
                        .font(.caption)
                        .foregroundStyle(.secondary)
                        .lineLimit(1)
                } else if let album = item.album {
                    Text(album.name)
                        .font(.caption)
                        .foregroundStyle(.secondary)
                        .lineLimit(1)
                }
                
                Label((item.mediaType?.rawValue ?? "unknown").capitalized, systemImage: mediaTypeIcon)
                    .font(.caption2)
                    .foregroundStyle(.tertiary)
            }
            
            Spacer()
        }
        .padding(.vertical, 4)
    }
    
    private var thumbnailShape: some Shape {
        if item.mediaType == .artist {
            return AnyShape(Circle())
        }
        return AnyShape(RoundedRectangle(cornerRadius: 8))
    }
    
    private var mediaTypeIcon: String {
        switch item.mediaType {
        case .track: return "music.note"
        case .album: return "opticaldisc"
        case .artist: return "music.mic"
        case .playlist: return "music.note.list"
        case .radio: return "antenna.radiowaves.left.and.right"
        case .podcast: return "mic.fill"
        case .podcastEpisode: return "mic"
        default: return "questionmark"
        }
    }
}

// MARK: - AnyShape Helper

struct AnyShape: Shape {
    private let _path: (CGRect) -> Path
    
    init<S: Shape>(_ shape: S) {
        _path = { rect in
            shape.path(in: rect)
        }
    }
    
    func path(in rect: CGRect) -> Path {
        _path(rect)
    }
}

#Preview {
    SearchView()
        .environment(MAService())
}