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// Copyright 2025 Shota FUJI
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0

import RoonKit
import SwiftUI

struct ConnectionScreen: View {
	private let conn: ConnectionDataModel
	private var onDisconnect: (() -> Void)
	private var onReconnect: (() -> Void)
	private var onCancel: (() -> Void)

	init(
		model: ConnectionDataModel,
		onDisconnect: (@escaping () -> Void),
		onReconnect: (@escaping () -> Void),
		onCancel: (@escaping () -> Void)
	) {
		self.conn = model
		self.onDisconnect = onDisconnect
		self.onReconnect = onReconnect
		self.onCancel = onCancel
	}

	var body: some View {
		VStack {
			switch conn.state {
			case .connecting, .waitingToReconnect:
				Loading(onCancel: {
					onCancel()
				})
			case .connected(let conn):
				ConnectedScreen(conn: conn)
					.environment(
						ImageURLBuilderDataModel(host: self.conn.host, port: self.conn.port)
					)
			case .failed(RoonKit.ServerLookupError.notFound):
				ContentUnavailableView {
					Label(
						"Server not found",
						systemImage: "exclamationmark.magnifyingglass"
					)
				} description: {
					Text("Server of ID=\(self.conn.serverID) does not found.")
				} actions: {
					Button(role: .cancel) {
						onDisconnect()
					} label: {
						Text("Cancel")
					}

					Button {
						onReconnect()
					} label: {
						Text("Retry")
					}
				}
			case .failed(CancelError.cancelled):
				ContentUnavailableView {
					Label(
						"Connection cancelled",
						systemImage: "exclamationmark.magnifyingglass"
					)
				} description: {
					Text("Cancelled connection to Roon server.")
				} actions: {
					Button(role: .cancel) {
						onDisconnect()
					} label: {
						Text("Close")
					}

					Button {
						onReconnect()
					} label: {
						Text("Connect")
					}
				}
			case .failed(_):
				ContentUnavailableView {
					Label(
						"Failed to connect",
						systemImage: "exclamationmark.magnifyingglass"
					)
				} description: {
					Text("Unable to connect to server due to error.")
				} actions: {
					Button(role: .cancel) {
						onDisconnect()
					} label: {
						Text("Cancel")
					}

					Button {
						onReconnect()
					} label: {
						Text("Connect")
					}
				}
			}
		}
	}
}

private struct Loading: View {
	private var onCancel: (() -> Void)?

	init(onCancel: (() -> Void)? = nil) {
		self.onCancel = onCancel
	}

	var body: some View {
		VStack(spacing: 8) {
			ProgressView {
				Text(
					"Connecting to Roon Server.\nMake sure you granted access at Settings > Extension page in official Roon client."
				)
				.multilineTextAlignment(.center)
			}

			Button(role: .cancel) {
				onCancel?()
			} label: {
				Text("Cancel")
			}
		}
	}
}

// MARK: - Preview

#Preview("Loading") {
	Loading(onCancel: {
		print("cancel")
	})
}