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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: Communicatable

	public var zone: TransportService.Zone? = nil {
		didSet {
			if !suppressSeekUpdates, let zone = zone {
				seek = Float(seeks[zone.id].flatMap({ $0 }) ?? 0)
			}
		}
	}

	private(set) var zones: [TransportService.Zone] = [] {
		didSet {
			if let zoneID = zone?.id {
				for zone in zones {
					if zone.id == zoneID {
						self.zone = zone
						return
					}
				}
			}

			for zone in zones {
				self.zone = zone
				return
			}

			zone = nil
		}
	}

	/// Whenever this property is on, `ZoneDataModel` skips updating `seek` property.
	/// Use this automatic changes to `seek` property is not desirable, e.g. user dragging a seekbar.
	public var suppressSeekUpdates: Bool = false

	private var seeks: [TransportService.Zone.ID: UInt64?] = [:] {
		didSet {
			guard let zone = zone else {
				return
			}

			if !suppressSeekUpdates {
				seek = Float(seeks[zone.id].flatMap({ $0 }) ?? 0)
			}
		}
	}

	public var seek: Float = 0.0

	init(conn: Communicatable) {
		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

		for zone in zones {
			seeks[zone.id] = zone.nowPlaying?.seekPosition
		}

		for try await message in await conn.messages.compactMap({
			TransportService.ZoneChangeEvent($0)
		}) {
			for added in message.addedZones {
				putZone(zone: added)
			}

			for changed in message.changedZones {
				putZone(zone: changed)
			}

			for removedID in message.removedZoneIDs {
				removeZone(zoneID: removedID)
			}

			for seekChange in message.seekChanges {
				seeks[seekChange.zoneID] = seekChange.seekPosition
			}
		}
	}

	private func putZone(zone: TransportService.Zone) {
		if let index = zones.firstIndex(where: { z in z.id == zone.id }) {
			zones[index] = zone
		} else {
			zones.append(zone)
		}

		seeks[zone.id] = zone.nowPlaying?.seekPosition
	}

	private func removeZone(zoneID: TransportService.Zone.ID) {
		if let index = zones.firstIndex(where: { z in z.id == zoneID }) {
			zones.remove(at: index)
		}

		seeks[zoneID] = nil
	}
}