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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 Network
import SwiftUI

struct ServerAddressForm: View {
	@State private var host: String = ""
	@State private var port: UInt16 = 9330
	@State private var isInvalidHost: Bool = false

	fileprivate var onConnectAction: ((_ host: String, _ port: UInt16) -> Void)? =
		nil

	private var portFormatter: NumberFormatter {
		let formatter = NumberFormatter()
		formatter.numberStyle = .none
		formatter.allowsFloats = false
		formatter.maximum = NSNumber(value: UInt16.max)
		formatter.minimum = 1
		return formatter
	}

	private var resolvedHost: String? {
		guard let addr = IPv4Address(host) else {
			return nil
		}

		return "\(addr)"
	}

	var body: some View {
		NavigationStack {
			Form {
				Section {
					TextField(text: $host) {
						Text(
							String(
								localized:
									"ServerAddressForm.Host.Label",
								defaultValue: "IPv4 address"
							)
						)
					}
					.autocorrectionDisabled()

					TextField(value: $port, formatter: portFormatter) {
						Text(
							String(
								localized:
									"ServerAddressForm.Port.Label",
								defaultValue: "HTTP port"
							)
						)
					}
					.autocorrectionDisabled()
				} header: {
					Text(
						String(
							localized: "ServerAddressForm.SectionName",
							defaultValue: "Roon server"
						)
					)
				} footer: {
					if let resolvedHost = resolvedHost {
						Text(
							String(
								localized:
									"ServerAddressForm.Description",
								defaultValue:
									"By tapping Connect, Plac will open a HTTP connection to \("\(resolvedHost):\(port)")"
							)
						)
					} else {
						Text(
							String(
								localized:
									"ServerAddressForm.InvalidHost.Description",
								defaultValue:
									"\"\(host)\" is not a valid IPv4 address."
							)
						)
					}
				}
			}
			.navigationTitle(
				String(
					localized: "ServerAddressForm.Title",
					defaultValue: "Connect to server"
				)
			)
			.toolbar {
				ToolbarItem(placement: .confirmationAction) {
					Button {
						guard let resolvedHost = resolvedHost else {
							isInvalidHost = true
							return
						}

						onConnectAction?(resolvedHost, port)
					} label: {
						Text(
							String(
								localized:
									"ServerAddressForm.Connect",
								defaultValue: "Connect"
							)
						)
					}
					.alert(
						String(
							localized:
								"ServerAddressForm.InvalidHost.Title",
							defaultValue: "Fill valid IPv4 address"
						),
						isPresented: $isInvalidHost
					) {
						Button {
							isInvalidHost = false
						} label: {
							Text(
								String(
									localized:
										"ServerAddressForm.InvalidHost.Close",
									defaultValue: "Close"
								)
							)
						}
					} message: {
						Text(
							String(
								localized:
									"ServerAddressForm.InvalidHost.Description",
								defaultValue:
									"\"\(host)\" is not a valid IPv4 address."
							)
						)
					}
				}
			}
		}
	}
}

extension ServerAddressForm {
	func onConnect(_ handler: @escaping (_ host: String, _ port: UInt16) -> Void)
		-> ServerAddressForm
	{
		var new = self
		new.onConnectAction = handler
		return new
	}
}

#Preview {
	ServerAddressForm()
		.onConnect { host, port in
			print(host)
			print(port)
		}
}