import Foundation

@main
struct PlayerCommandChecks {
    static func require(_ condition: Bool, _ message: String) {
        if !condition { fatalError("FAIL: " + message) }
    }

    static func main() throws {
        let directory = FileManager.default.temporaryDirectory.appendingPathComponent("terebi.cli-check.\(UUID().uuidString)")
        try FileManager.default.createDirectory(at: directory, withIntermediateDirectories: true)
        defer { try? FileManager.default.removeItem(at: directory) }
        let movie = directory.appendingPathComponent("video with spaces.mp4")
        let optionFile = directory.appendingPathComponent("--help")
        let colonFile = directory.appendingPathComponent("part:1.mp4")
        for file in [movie, optionFile, colonFile] { try Data().write(to: file) }

        func opened(_ arguments: [String]) throws -> URL? {
            guard case .launch(let url) = try PlayerCommand.parse(arguments, directory: directory) else {
                fatalError("FAIL: expected a launch command")
            }
            return url
        }
        require(try opened([movie.lastPathComponent]) == movie, "relative paths resolve against invocation directory, preserving spaces")
        require(try opened([movie.absoluteString]) == movie, "encoded local file URLs preserve filename identity")
        require(try opened(["--", "--help"]) == optionFile, "option terminator allows filenames that look like commands")
        require(try opened([colonFile.path]) == colonFile, "colons in filesystem paths are not URL schemes")
        let canonical = URL(string: "https://www.youtube.com/watch?v=jNQXAC9IVRw")!
        require(try opened(["https://youtu.be/jNQXAC9IVRw"]) == canonical, "YouTube positional URLs canonicalize for resume identity")

        for arguments in [["--url"], ["--url", canonical.absoluteString, movie.path], ["--"],
                          [movie.path, movie.path], ["--unknown"], ["missing.mp4"], [directory.path],
                          ["file://remote-host/video.mp4"], ["https://example.com/video.mp4"]] {
            do {
                _ = try PlayerCommand.parse(arguments, directory: directory)
                fatalError("FAIL: accepted an invalid command")
            } catch {}
        }
        print("Player command checks passed")
    }
}