//===----------------------------------------------------------*- swift -*-===//
//
// This source file is part of the Swift Argument Parser open source project
//
// Copyright (c) 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//

import XCTest
import ArgumentParserTestHelpers
@testable import ArgumentParser

final class CompletionScriptTests: XCTestCase {
}

extension CompletionScriptTests {
  struct Path: ExpressibleByArgument {
    var path: String

    init?(argument: String) {
      self.path = argument
    }

    static var defaultCompletionKind: CompletionKind {
      .file()
    }
  }

  enum Kind: String, ExpressibleByArgument, CaseIterable {
    case one, two, three = "custom-three"
  }

  struct Base: ParsableCommand {
    static var configuration = CommandConfiguration(shouldPromptForMissing: false)
    @Option(help: "The user's name.") var name: String
    @Option() var kind: Kind
    @Option(completion: .list(["1", "2", "3"])) var otherKind: Kind

    @Option() var path1: Path
    @Option() var path2: Path?
    @Option(completion: .list(["a", "b", "c"])) var path3: Path

    @Flag(help: .hidden) var verbose = false
  }

  func testBase_Zsh() throws {
    let script1 = try CompletionsGenerator(command: Base.self, shell: .zsh)
      .generateCompletionScript()
    XCTAssertEqual(zshBaseCompletions, script1)

    let script2 = try CompletionsGenerator(command: Base.self, shellName: "zsh")
      .generateCompletionScript()
    XCTAssertEqual(zshBaseCompletions, script2)

    let script3 = Base.completionScript(for: .zsh)
    XCTAssertEqual(zshBaseCompletions, script3)
  }

  func testBase_Bash() throws {
    let script1 = try CompletionsGenerator(command: Base.self, shell: .bash)
      .generateCompletionScript()
    XCTAssertEqual(bashBaseCompletions, script1)

    let script2 = try CompletionsGenerator(command: Base.self, shellName: "bash")
      .generateCompletionScript()
    XCTAssertEqual(bashBaseCompletions, script2)

    let script3 = Base.completionScript(for: .bash)
    XCTAssertEqual(bashBaseCompletions, script3)
  }

  func testBase_Fish() throws {
    let script1 = try CompletionsGenerator(command: Base.self, shell: .fish)
      .generateCompletionScript()
    XCTAssertEqual(fishBaseCompletions, script1)

    let script2 = try CompletionsGenerator(command: Base.self, shellName: "fish")
      .generateCompletionScript()
    XCTAssertEqual(fishBaseCompletions, script2)

    let script3 = Base.completionScript(for: .fish)
    XCTAssertEqual(fishBaseCompletions, script3)
  }
}

extension CompletionScriptTests {
  struct Custom: ParsableCommand {
    static var configuration = CommandConfiguration(shouldPromptForMissing: false)
    @Option(name: .shortAndLong, completion: .custom { _ in ["a", "b", "c"] })
    var one: String

    @Argument(completion: .custom { _ in ["d", "e", "f"] })
    var two: String

    @Option(name: .customShort("z"), completion: .custom { _ in ["x", "y", "z"] })
    var three: String
  }

  func verifyCustomOutput(
    _ arg: String,
    expectedOutput: String,
    file: StaticString = #file, line: UInt = #line
  ) throws {
    do {
      _ = try Custom.parse(["---completion", "--", arg])
      XCTFail("Didn't error as expected", file: (file), line: line)
    } catch let error as CommandError {
      guard case .completionScriptCustomResponse(let output) = error.parserError else {
        throw error
      }
      XCTAssertEqual(expectedOutput, output, file: (file), line: line)
    }
  }

  func testCustomCompletions() throws {
    try verifyCustomOutput("-o", expectedOutput: "a\nb\nc")
    try verifyCustomOutput("--one", expectedOutput: "a\nb\nc")
    try verifyCustomOutput("two", expectedOutput: "d\ne\nf")
    try verifyCustomOutput("-z", expectedOutput: "x\ny\nz")

    XCTAssertThrowsError(try verifyCustomOutput("--bad", expectedOutput: ""))
  }
}

extension CompletionScriptTests {
  struct EscapedCommand: ParsableCommand {
    static var configuration = CommandConfiguration(shouldPromptForMissing: false)
    @Option(help: #"Escaped chars: '[]\."#)
    var one: String

    @Argument(completion: .custom { _ in ["d", "e", "f"] })
    var two: String
  }

  func testEscaped_Zsh() throws {
    XCTAssertEqual(zshEscapedCompletion, EscapedCommand.completionScript(for: .zsh))
  }
}

private let zshBaseCompletions = """
#compdef base
local context state state_descr line
_base_commandname=$words[1]
typeset -A opt_args

_base() {
    integer ret=1
    local -a args
    args+=(
        '--name[The user'"'"'s name.]:name:'
        '--kind:kind:(one two custom-three)'
        '--other-kind:other-kind:(1 2 3)'
        '--path1:path1:_files'
        '--path2:path2:_files'
        '--path3:path3:(a b c)'
        '(-h --help)'{-h,--help}'[Show help information.]'
    )
    _arguments -w -s -S $args[@] && ret=0

    return ret
}


_custom_completion() {
    local completions=("${(@f)$($*)}")
    _describe '' completions
}

_base
"""

private let bashBaseCompletions = """
#!/bin/bash

_base() {
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"
    COMPREPLY=()
    opts="--name --kind --other-kind --path1 --path2 --path3 -h --help"
    if [[ $COMP_CWORD == "1" ]]; then
        COMPREPLY=( $(compgen -W "$opts" -- "$cur") )
        return
    fi
    case $prev in
        --name)

            return
        ;;
        --kind)
            COMPREPLY=( $(compgen -W "one two custom-three" -- "$cur") )
            return
        ;;
        --other-kind)
            COMPREPLY=( $(compgen -W "1 2 3" -- "$cur") )
            return
        ;;
        --path1)
            COMPREPLY=( $(compgen -f -- "$cur") )
            return
        ;;
        --path2)
            COMPREPLY=( $(compgen -f -- "$cur") )
            return
        ;;
        --path3)
            COMPREPLY=( $(compgen -W "a b c" -- "$cur") )
            return
        ;;
    esac
    COMPREPLY=( $(compgen -W "$opts" -- "$cur") )
}


complete -F _base base
"""

private let zshEscapedCompletion = """
#compdef escaped-command
local context state state_descr line
_escaped_command_commandname=$words[1]
typeset -A opt_args

_escaped-command() {
    integer ret=1
    local -a args
    args+=(
        '--one[Escaped chars: '"'"'\\[\\]\\\\.]:one:'
        ':two:{_custom_completion $_escaped_command_commandname ---completion  -- two $words}'
        '(-h --help)'{-h,--help}'[Show help information.]'
    )
    _arguments -w -s -S $args[@] && ret=0

    return ret
}


_custom_completion() {
    local completions=("${(@f)$($*)}")
    _describe '' completions
}

_escaped-command
"""

private let fishBaseCompletions = """
# A function which filters options which starts with "-" from $argv.
function _swift_base_preprocessor
    set -l results
    for i in (seq (count $argv))
        switch (echo $argv[$i] | string sub -l 1)
            case '-'
            case '*'
                echo $argv[$i]
        end
    end
end

function _swift_base_using_command
    set -l currentCommands (_swift_base_preprocessor (commandline -opc))
    set -l expectedCommands (string split " " $argv[1])
    set -l subcommands (string split " " $argv[2])
    if [ (count $currentCommands) -ge (count $expectedCommands) ]
        for i in (seq (count $expectedCommands))
            if [ $currentCommands[$i] != $expectedCommands[$i] ]
                return 1
            end
        end
        if [ (count $currentCommands) -eq (count $expectedCommands) ]
            return 0
        end
        if [ (count $subcommands) -gt 1 ]
            for i in (seq (count $subcommands))
                if [ $currentCommands[(math (count $expectedCommands) + 1)] = $subcommands[$i] ]
                    return 1
                end
            end
        end
        return 0
    end
    return 1
end

complete -c base -n '_swift_base_using_command \"base\"' -l name -d 'The user\\\'s name.'
complete -c base -n '_swift_base_using_command \"base\"' -l kind -r -f -k -a 'one two custom-three'
complete -c base -n '_swift_base_using_command \"base\"' -l other-kind -r -f -k -a '1 2 3'
complete -c base -n '_swift_base_using_command \"base\"' -l path1 -r -f -a '(for i in *.{}; echo $i;end)'
complete -c base -n '_swift_base_using_command \"base\"' -l path2 -r -f -a '(for i in *.{}; echo $i;end)'
complete -c base -n '_swift_base_using_command \"base\"' -l path3 -r -f -k -a 'a b c'
complete -c base -n '_swift_base_using_command \"base\"' -s h -l help -d 'Show help information.'
"""

// MARK: - Test Hidden Subcommand
struct Parent: ParsableCommand {
  static var configuration = CommandConfiguration(
    shouldPromptForMissing: false,
    subcommands: [HiddenChild.self])
}

struct HiddenChild: ParsableCommand {
  static var configuration = CommandConfiguration(
    shouldDisplay: false, shouldPromptForMissing: false)
}

extension CompletionScriptTests {
  func testHiddenSubcommand_Zsh() throws {
    let script1 = try CompletionsGenerator(command: Parent.self, shell: .zsh)
      .generateCompletionScript()
    XCTAssertEqual(zshHiddenCompletion, script1)

    let script2 = try CompletionsGenerator(command: Parent.self, shellName: "zsh")
      .generateCompletionScript()
    XCTAssertEqual(zshHiddenCompletion, script2)

    let script3 = Parent.completionScript(for: .zsh)
    XCTAssertEqual(zshHiddenCompletion, script3)
  }

  func testHiddenSubcommand_Bash() throws {
    let script1 = try CompletionsGenerator(command: Parent.self, shell: .bash)
      .generateCompletionScript()
    XCTAssertEqual(bashHiddenCompletion, script1)

    let script2 = try CompletionsGenerator(command: Parent.self, shellName: "bash")
      .generateCompletionScript()
    XCTAssertEqual(bashHiddenCompletion, script2)

    let script3 = Parent.completionScript(for: .bash)
    XCTAssertEqual(bashHiddenCompletion, script3)
  }

  func testHiddenSubcommand_Fish() throws {
    let script1 = try CompletionsGenerator(command: Parent.self, shell: .fish)
      .generateCompletionScript()
    XCTAssertEqual(fishHiddenCompletion, script1)

    let script2 = try CompletionsGenerator(command: Parent.self, shellName: "fish")
      .generateCompletionScript()
    XCTAssertEqual(fishHiddenCompletion, script2)

    let script3 = Parent.completionScript(for: .fish)
    XCTAssertEqual(fishHiddenCompletion, script3)
  }
}

let zshHiddenCompletion = """
#compdef parent
local context state state_descr line
_parent_commandname=$words[1]
typeset -A opt_args

_parent() {
    integer ret=1
    local -a args
    args+=(
        '(-h --help)'{-h,--help}'[Show help information.]'
    )
    _arguments -w -s -S $args[@] && ret=0

    return ret
}


_custom_completion() {
    local completions=("${(@f)$($*)}")
    _describe '' completions
}

_parent
"""

let bashHiddenCompletion = """
#!/bin/bash

_parent() {
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"
    COMPREPLY=()
    opts="-h --help"
    if [[ $COMP_CWORD == "1" ]]; then
        COMPREPLY=( $(compgen -W "$opts" -- "$cur") )
        return
    fi
    COMPREPLY=( $(compgen -W "$opts" -- "$cur") )
}


complete -F _parent parent
"""

let fishHiddenCompletion = """
# A function which filters options which starts with "-" from $argv.
function _swift_parent_preprocessor
    set -l results
    for i in (seq (count $argv))
        switch (echo $argv[$i] | string sub -l 1)
            case '-'
            case '*'
                echo $argv[$i]
        end
    end
end

function _swift_parent_using_command
    set -l currentCommands (_swift_parent_preprocessor (commandline -opc))
    set -l expectedCommands (string split " " $argv[1])
    set -l subcommands (string split " " $argv[2])
    if [ (count $currentCommands) -ge (count $expectedCommands) ]
        for i in (seq (count $expectedCommands))
            if [ $currentCommands[$i] != $expectedCommands[$i] ]
                return 1
            end
        end
        if [ (count $currentCommands) -eq (count $expectedCommands) ]
            return 0
        end
        if [ (count $subcommands) -gt 1 ]
            for i in (seq (count $subcommands))
                if [ $currentCommands[(math (count $expectedCommands) + 1)] = $subcommands[$i] ]
                    return 1
                end
            end
        end
        return 0
    end
    return 1
end

complete -c parent -n '_swift_parent_using_command \"parent\"' -s h -l help -d 'Show help information.'
"""