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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 Foundation

public struct ImageService {
	public static let id = "com.roonlabs.image:1"

	public typealias Key = String

	public enum Format: String, Codable {
		case jpeg = "image/jpeg"
		case png = "image/png"
	}

	public enum ScalingMethod: String, Codable {
		case fit, fill, stretch
	}

	public struct GetRequest {
		public let key: Key

		public let format: Format?
		public let scale: ScalingMethod?
		public let width: UInt?
		public let height: UInt?

		public init(
			key: Key,
			format: Format? = nil,
			scale: ScalingMethod? = nil,
			width: UInt? = nil,
			height: UInt? = nil
		) {
			self.key = key
			self.format = format
			self.scale = scale
			self.width = width
			self.height = height
		}
	}
}

extension URL {
	public init?(roonImage: ImageService.GetRequest, host: String, port: UInt16) {
		var queries: [URLQueryItem] = []

		if let scale = roonImage.scale {
			queries.append(.init(name: "scale", value: scale.rawValue))
		}

		if let width = roonImage.width {
			queries.append(.init(name: "width", value: String(width, radix: 10)))
		}

		if let height = roonImage.height {
			queries.append(.init(name: "height", value: String(height, radix: 10)))
		}

		if let format = roonImage.format {
			queries.append(.init(name: "format", value: format.rawValue))
		}

		var components = URLComponents()
		components.host = host
		components.port = Int(port)
		components.path = "/api/image/\(roonImage.key)"
		components.scheme = "http"

		if queries.count > 0 {
			components.queryItems = queries
		}

		if let url = components.url {
			self = url
		} else {
			return nil
		}
	}
}