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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

@Observable
final class ZoneDataModel {
	let conn: Connection

	private var zoneID: TransportService.Zone.ID? = nil
	private var _zones: [TransportService.Zone.ID: TransportService.Zone] = [:]

	private(set) var zones: [TransportService.Zone.ID: TransportService.Zone] {
		get { _zones }

		set {
			_zones = newValue

			if let zoneID = zoneID, _zones[zoneID] != nil {
				return
			}

			zoneID = _zones.first?.key
		}
	}

	var zone: TransportService.Zone? {
		get {
			if let zoneID = zoneID {
				zones[zoneID]
			} else {
				nil
			}
		}

		set { zoneID = newValue?.id }
	}

	init(conn: Connection) {
		self.conn = conn
	}

	func watchChanges() async throws {
		let msg = try await conn.request(
			Moo(subscribeZoneChange: .init(subscriptionID: UUID().uuidString))
		)
		let body = try TransportService.SubscribeZoneChangesResponse(msg)

		zones = body.zones.reduce(into: [:]) { dict, zone in
			dict[zone.id] = zone
		}

		for try await message in await conn.messages.compactMap({
			TransportService.ZoneChangeEvent($0)
		}) {
			for added in message.addedZones {
				zones[added.id] = added
			}

			for changed in message.changedZones {
				zones[changed.id] = changed
			}

			for removedID in message.removedZoneIDs {
				zones[removedID] = nil
			}
		}
	}
}