//===----------------------------------------------------------------------===//
// Copyright © 2025-2026 Apple Inc. and the container project authors.
//
// 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
//
//   https://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.
//===----------------------------------------------------------------------===//

import ArgumentParser
import ContainerAPIClient
import ContainerResource
import ContainerizationError
import Foundation

extension Application.VolumeCommand {
    public struct VolumeDelete: AsyncLoggableCommand {
        public static let configuration = CommandConfiguration(
            commandName: "delete",
            abstract: "Delete one or more volumes",
            aliases: ["rm"]
        )

        @Flag(name: .shortAndLong, help: "Delete all volumes")
        var all = false

        @OptionGroup
        public var logOptions: Flags.Logging

        @Argument(help: "Volume names")
        var names: [String] = []

        public init() {}

        public func validate() throws {
            if names.count == 0 && !all {
                throw ContainerizationError(.invalidArgument, message: "no volumes specified and --all not supplied")
            }
            if names.count > 0 && all {
                throw ContainerizationError(
                    .invalidArgument,
                    message: "explicitly supplied volume name(s) conflict with the --all flag"
                )
            }
        }

        public func run() async throws {
            let uniqueVolumeNames = Set<String>(names)
            let volumes: [VolumeConfiguration]

            if all {
                volumes = try await ClientVolume.list()
            } else {
                volumes = try await ClientVolume.list()
                    .filter { v in
                        uniqueVolumeNames.contains(v.id)
                    }

                // If one of the volumes requested isn't present lets throw. We don't need to do
                // this for --all as --all should be perfectly usable with no volumes to remove,
                // otherwise it'd be quite clunky.
                if volumes.count != uniqueVolumeNames.count {
                    let missing = uniqueVolumeNames.filter { id in
                        !volumes.contains { v in
                            v.id == id
                        }
                    }
                    throw ContainerizationError(
                        .notFound,
                        message: "failed to delete one or more volumes: \(missing)"
                    )
                }
            }

            var failed = [String]()
            let _log = log
            try await withThrowingTaskGroup(of: VolumeConfiguration?.self) { group in
                for volume in volumes {
                    group.addTask {
                        do {
                            try await ClientVolume.delete(name: volume.id)
                            print(volume.id)
                            return nil
                        } catch {
                            _log.error(
                                "failed to delete volume",
                                metadata: [
                                    "id": "\(volume.id)",
                                    "error": "\(error)",
                                ])
                            return volume
                        }
                    }
                }

                for try await volume in group {
                    guard let volume else {
                        continue
                    }
                    failed.append(volume.id)
                }
            }

            if failed.count > 0 {
                throw ContainerizationError(.internalError, message: "delete failed for one or more volumes: \(failed)")
            }
        }
    }
}
