//===----------------------------------------------------------------------===//
// Copyright © 2025 Apple Inc. and the container project authors. All rights reserved.
//
// 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 ContainerClient
import Containerization
import ContainerizationError
import ContainerizationOCI
import TerminalProgress

extension Application {
    struct ImagePull: AsyncParsableCommand {
        static let configuration = CommandConfiguration(
            commandName: "pull",
            abstract: "Pull an image"
        )

        @OptionGroup
        var global: Flags.Global

        @Option(help: "Platform string in the form 'os/arch/variant'. Example 'linux/arm64/v8', 'linux/amd64'") var platform: String?

        @Flag(help: "Pull using plain-text http") var http: Bool = false

        @Argument var reference: String

        init() {}

        init(platform: String? = nil, http: Bool = false, reference: String) {
            self.global = Flags.Global()
            self.platform = platform
            self.http = http
            self.reference = reference
        }

        func run() async throws {
            var p: Platform?
            if let platform {
                p = try Platform(from: platform)
            }

            let processedReference = try ClientImage.normalizeReference(reference)
            let progressConfig = try ProgressConfig(
                showTasks: true,
                showItems: true,
                ignoreSmallSize: true,
                totalTasks: 2
            )
            let progress = ProgressBar(config: progressConfig)
            defer {
                progress.finish()
            }
            progress.start()

            progress.set(description: "Fetching image")
            progress.set(itemsName: "blobs")
            let taskManager = ProgressTaskCoordinator()
            let fetchTask = await taskManager.startTask()
            let image = try await ClientImage.pull(
                reference: processedReference, platform: p, progressUpdate: ProgressTaskCoordinator.handler(for: fetchTask, from: progress.handler)
            )

            progress.set(description: "Unpacking image")
            progress.set(itemsName: "entries")
            let unpackTask = await taskManager.startTask()
            try await image.unpack(platform: p, progressUpdate: ProgressTaskCoordinator.handler(for: unpackTask, from: progress.handler))
            await taskManager.finish()
            progress.finish()
        }
    }
}