import SwiftCLI

class GreetCommand: Command {
    let name = "greet"
    
    @Param var person: String

    func execute() throws {
        stdout <<< "Hello \(person)!"
    }
}

let greeter = CLI(name: "greeter")
greeter.commands = [GreetCommand()]
greeter.go()

dependencies: [
    .package(url: "https://github.com/jakeheis/SwiftCLI", from: "6.0.0")
]

let myCli = CLI(name: "greeter", version: "1.0.0", description: "Greeter - a friendly greeter")

myCli.commands = [myCommand, myOtherCommand]

// Use go if you want program execution to continue afterwards
myCli.go() 

// Use goAndExit if you want your program to terminate after the CLI has finished
myCli.goAndExit()

// Use go(with:) if you want to control the arguments which the CLI runs with
myCli.go(with: ["arg1", "arg2"])

class GreetCommand: Command {

    let name = "greet"
    let shortDescription = "Says hello to the world"

    func execute() throws  {
        stdout <<< "Hello world!"
    }

}

class GreetCommand: Command {
    let name = "greet"

    @Param var first: String
    @Param var second: String?
    @CollectedParam var remaining: [String]
}

class GreetCommand: Command {
    let name = "greet"

    @Param var person: String
    @Param var followUp: String

    func execute() throws {
        stdout <<< "Hey there, \(person)!"
        stdout <<< followUp
    }
}

class GreetCommand: Command {
    let name = "greet"

    @Param var person: String
    @Param var followUp: String? // Note: String? in this example, not String

    func execute() throws {
        stdout <<< "Hey there, \(person)!"
        if let followUpText = followUp {
            stdout <<< followUpText
        }
    }
}

class GreetCommand: Command {
    let name = "greet"

    @CollectedParam(minCount: 1) var people: [String]

    func execute() throws {
        for person in people {
            stdout <<< "Hey there, \(person)!"
        }        
    }
}

class GreetCommand: Command {
    let name = "greet"

    @Param var number: Int

    func execute() throws {
        stdout <<< "Hey there, number \(number)!"     
    }
}

class GreetCommand: Command {
    
    let name = "greet"
    
    enum Volume: String, ConvertibleFromString, CaseIterable {
        case loud
        case quiet
    }
    
    @Param var volume: Volume
    
    func execute() throws {
        let greeting = "Hello world!"
        
        switch volume {
        case .loud: stdout <<< greeting.uppercased()
        case .quiet: stdout <<< greeting.lowercased()
        }
        
    }
}

extension MyType: ConvertibleFromString {
    init?(input: String) {
        // Construct an instance of MyType from the String, or return nil if not possible
        ...
    }
}

class ExampleCommand: Command {
    ...
    @Flag("-a", "--all")
    var flag: Bool

    @Key("-t", "--times")
    var key: Int?
    ...
}

class GreetCommand: Command {

    ...

    @Flag("-l", "--loudly", description: "Say the greeting loudly")
    var loudly: Bool

    func execute() throws {
        if loudly {
             ...
        } else {
            ...
        }
    }

}

class GreetCommand: Command {
    ...
    @CounterFlag("-s", "--softly", description: "Say the greeting softly")
    var softly: Int
    ...
}

class GreetCommand: Command {

    ...

    @Key("-n", "--number-of-times", description: "Say the greeting a certain number of times")
    var numberOfTimes: Int?

    func execute() throws {
        for i in 0..<(numberOfTimes ?? 1) {
            ...
        }
    }

}

class GreetCommand: Command {
    ...
    @VariadicKey("-l", "--location", description: "Say the greeting in a certain location")
    var locations: [String]
    ...
}

class GreetCommand: Command {

    ...

    @Flag("-l", "--loudly", description: "Say the greeting loudly")
    var loudly: Bool

    @Flag("-w", "--whisper", description: "Whisper the greeting")
    var whisper: Bool
    
    var optionGroups: [OptionGroup] {
        return [.atMostOne($loudly, $whipser)] // Note: $loudly and $whisper, not loudly and whisper
    }

    func execute() throws {
        if loudly {
            ...
        } else if whisper {
            ...
        } else {
            ...
        }
    }

}

private let verboseFlag = Flag("-v")
extension Command {
    var verbose: Bool {
        return verboseFlag.value
    }
}

myCli.globalOptions.append(verboseFlag)

myCli.helpFlag = nil

class ConfigGroup: CommandGroup {
    let name = "config"
    let children = [GetCommand(), SetCommand()]
}
class GetCommand: Command {
    let name = "get"
    func execute() throws {}
}
class SetCommand: Command {
    let name = "set"
    func execute() throws {}
}

greeter.commands = [ConfigGroup()]

let myCli = CLI(...)

let generator = ZshCompletionGenerator(cli: myCli)
generator.writeCompletions()

@Param(completion: .none)
var noCompletions: String

@Param(completion: .filename)
var aFile: String

@Param(completion: .values([
    ("optionA", "the first available option"),
    ("optionB", "the second available option")
]))
var aValue: String

@Param(completion: .function("_my_custom_func"))
var aFunction: String

class MyCommand {
    ...
    @Param(completion: .function("_list_processes"))
    var pid: String
    ...
}

let myCLI = CLI(...)
myCLI.commands [MyCommand()]
let generator = ZshCompletionGenerator(cli: myCli, functions: [
    "_list_processes": """
        local pids
        pids=( $(ps -o pid=) )
        _describe '' pids
        """
])

myCLI.helpCommand = nil

myCLI.versionCommand = nil

let str = Input.readLine()
let int = Input.readInt()
let double = Input.readDouble()
let bool = Input.readBool()

let percentage = Input.readDouble(
    prompt: "Percentage:",
    validation: [.within(0...100)],
    errorResponse: { (input, reason) in
        Term.stderr <<< "'\(input)' is invalid; must be a number between 0 and 100"
    }
)

// Execute a command and print output:
try Task.run("echo", "hello")
try Task.run(bash: "while true; do echo hi && sleep 1; done")

// Execute a command and capture the output:
let currentDirectory = try Task.capture("pwd").stdout
let sorted = try Task.capture(bash: "cat Package.swift | sort").stdout

let input = PipeStream()
let output = PipeStream()
let task = Task(executable: "sort", currentDirectory: "~/Ice", stdout: output, stdin: input)
task.runAsync()

input <<< "beta"
input <<< "alpha"
input.closeWrite()

output.readAll() // will be alpha\nbeta\n

class Ln: Command {
    let name = "ln"
    func execute() throws { ... }
}

let ln = CLI(singleCommand: Ln())
ln.go()

class Run: Command {
    let name = "run"

    @Param var executable: String
    @CollectedParam var arguments: [String]

    @Flag("-a") var all: Bool
    ...
}

myCLI.aliases["-c"] = "command"

myCLI.aliases["--version"] = nil

cli.argumentListManipulators.append(MyManipulator())

cli.helpMessageGenerator = MyHelpMessageGenerator()