# Copyright (c) 2020 The ZMK Contributors
# SPDX-License-Identifier: MIT

$ErrorActionPreference = "Stop"

function Get-Choice-From-Options {
    param(
        [String[]] $Options,
        [String] $Prompt
    )

    while ($true) {
        for ($i = 0; $i -lt $Options.length; $i++) {
            Write-Host "$($i + 1)) $($Options[$i])"
        }

        Write-Host "$($Options.length + 1)) Quit"
        $selection = (Read-Host $Prompt) -as [int]

        if ($selection -eq $Options.length + 1) {
            Write-Host "Goodbye!"
            exit 1
        }
        elseif ($selection -le $Options.length -and $selection -gt 0) {
            $choice = $($selection - 1)
            break
        }
        else {
            Write-Host "Invalid Option. Try another one."
        }
    }

    return $choice
}

function Test-Git-Config {
    param(
        [String] $Option,
        [String] $ErrMsg
    )

    git config $Option | Out-Null

    if ($lastExitCode -ne 0) {
        Write-Host $ErrMsg
        exit 1
    }
}

try {
    git | Out-Null
}
catch [System.Management.Automation.CommandNotFoundException] {
    Write-Host "Git is not installed, and is required for this script!"
    exit 1
}

Test-Git-Config -Option "user.name" -ErrMsg "Git username not set!`nRun: git config --global user.name 'My Name'"
Test-Git-Config -Option "user.email" -ErrMsg "Git email not set!`nRun: git config --global user.email 'example@myemail.com'"

function Test-CommandExists {
    param ($command)

    $oldPreference = $ErrorActionPreference
    $ErrorActionPreference = "stop"

    try {
        if(Get-Command $command){ return $true }
    } Catch { return $false }
    Finally { $ErrorActionPreference=$oldPreference }
}

if (Test-CommandExists Get-Acl) {
    $permission = (Get-Acl $pwd).Access |
    ?{$_.IdentityReference -match $env:UserName `
        -and $_.FileSystemRights -match "FullControl" `
        -or $_.FileSystemRights -match "Write" } |
             Select IdentityReference,FileSystemRights

    If (-Not $permission){
        Write-Host "Sorry, you do not have write permissions in this directory."
        Write-Host "Please try running this script again from a directory that you do have write permissions for."
        exit 1
    }
}

$repo_path = "https://github.com/zmkfirmware/unified-zmk-config-template.git"

$title = "ZMK Config Setup:"
Write-Host ""
Write-Host "Keyboard Shield Selection:"
$prompt = "Pick a keyboard"

$keyboards = [ordered]@{
    {{#keyboards}}
    "{{id}}" = @{
        name = "{{{name}}}";
        type = "{{type}}";
        basedir = "{{__base_dir}}";
        split = "{{split}}";
        arch = "{{arch}}";
        siblings = {{#siblings.0}}@(
            {{#siblings}}
            "{{.}}"
            {{/siblings}}
            ){{/siblings.0}}{{^siblings.0}}( "{{id}}" ){{/siblings.0}};
    }
    {{/keyboards}}
}
# TODO: Add support for "Other" and linking to docs on adding custom shields in user config repos.

$choice = Get-Choice-From-Options -Options ($keyboards.values | % { $_['name'] }) -Prompt $prompt
$keyboard = $($($keyboards.keys)[$choice])
$keyboard_title = $keyboards[$keyboard].name
$basedir = $keyboards[$keyboard].basedir
$keyboard_split = $keyboards[$keyboard].split
$keyboard_arch = $keyboards[$keyboard].arch
$keyboard_siblings = $keyboards[$keyboard].siblings
$keyboard_type = $keyboards[$keyboard].type

if ($keyboard_type -eq "shield") {
    $prompt = "Pick an MCU board"
    $boards = [ordered]@{
        {{#boards}}
        {{id}} = "{{{name}}}";
        {{/boards}}
    }
    $boards_usb_only = [ordered]@{
        {{#boards}}
        {{id}} = "{{usb_only}}";
        {{/boards}}
    }

    Write-Host "$title"
    Write-Host ""
    Write-Host "MCU Board Selection:"

    $choice = Get-Choice-From-Options -Options $boards.values -Prompt $prompt

    if ($keyboard_split -eq "true" -and $($($boards_usb_only.values)[$choice]) -eq "true") {
        Write-Host "Wired split is not yet supported by ZMK."
        exit 1
    }

    $shields = $keyboard_siblings
    $board = $($($boards.keys)[$choice])
    $boards = ( $board )
} else {
    $boards = ( $keyboard_siblings )
    $shields = @( )
}

$copy_keymap = Read-Host "Copy in the stock keymap for customisation? [Yn]"

if ($copy_keymap -eq "" -or $copy_keymap -eq "Y" -or $copy_keymap -eq "y") {
    $copy_keymap = "yes"
}

$github_user = Read-Host "GitHub Username (leave empty to skip GitHub repo creation)"

if ($github_user -ne "") {
    $repo_name = Read-Host "GitHub Repo Name [zmk-config]"

    if ($repo_name -eq "") {
        $repo_name = "zmk-config"
    }

    $github_repo = Read-Host "GitHub Repo [https://github.com/$github_user/$repo_name.git]"

    if ($github_repo -eq "") {
        $github_repo = "https://github.com/$github_user/$repo_name.git"
    }
}
else {
    $repo_name = "zmk-config"
    $github_repo = ""
}

Write-Host ""
Write-Host "Preparing a user config for:"
if ($keyboard_type -eq "shield") {
    Write-Host "* MCU Board: ${boards}"
    Write-Host "* Shield(s): ${shields}"
} else {
    Write-Host "* Board(s): ${boards}"
}

if ($copy_keymap -eq "yes") {
    Write-Host "* Copy Keymap?: Yes"
}
else {
    Write-Host "* Copy Keymap?: No"
}

if ($github_repo -ne "") {
    Write-Host "* GitHub Repo to Push (please create this in GH first!): $github_repo"
}

Write-Host ""
$do_it = Read-Host "Continue? [Yn]"

if ($do_it -ne "" -and $do_it -ne "Y" -and $do_it -ne "y") {
    Write-Host "Aborting..."
    exit 1
}

git clone --single-branch "$repo_path" "$repo_name"
Set-Location "$repo_name"

Push-Location config

if ($keyboard_type -eq "shield") {
    $url_base = "https://raw.githubusercontent.com/zmkfirmware/zmk/main/app/boards/shields/${basedir}"
} else {
    $url_base = "https://raw.githubusercontent.com/zmkfirmware/zmk/main/app/boards/${keyboard_arch}/${basedir}"
}

Write-Host "Downloading config file (${url_base}/${keyboard}.conf)"
Try {
    Invoke-RestMethod -Uri "${url_base}/${keyboard}.conf" -OutFile "${keyboard}.conf"
} Catch {
    Try {
        Write-Host "Could not find it, falling back to ${url_base}/${basedir}.conf"
        Invoke-RestMethod -Uri "${url_base}/${basedir}.conf" -OutFile "${basedir}.conf"
    } Catch {
        Set-Content -Path "${keyboard}.conf" "# Put configuration options here"
    }
}

if ($copy_keymap -eq "yes") {
    Write-Host "Downloading keymap file (${url_base}/${keyboard}.keymap)"
    Try {
        Invoke-RestMethod -Uri "${url_base}/${keyboard}.keymap" -OutFile "${keyboard}.keymap"
    } Catch {
        Write-Host "Could not find it, falling back to ${url_base}/${basedir}.keymap"
        Try {
            Invoke-RestMethod -Uri "${url_base}/${basedir}.keymap" -OutFile "${basedir}.keymap"
        } Catch {
            Write-Host "Warning: Could not find a keymap file to download!"
        }
    }
}

Pop-Location

Add-Content -Path "build.yaml" -Value "include:"
foreach ($b in ${boards}) {
    if ($keyboard_type -eq "shield") {
        foreach ($s in ${shields}) {
            Add-Content -Path "build.yaml" -Value "  - board: $b"
            Add-Content -Path "build.yaml" -Value "    shield: $s"
        }
    } else {
        Add-Content -Path "build.yaml" -Value "  - board: $b"
    }
}

Remove-Item -Recurse -Force .git
git init .
git add .
git commit -m "Initial User Config."

if ($github_repo -ne "") {
    git remote add origin "$github_repo"

    git push --set-upstream origin $(git symbolic-ref --short HEAD)

    # If push failed, assume that the origin was incorrect and give instructions on fixing.
    if ($lastExitCode -ne 0) {
        Write-Host "Remote repository $github_repo not found..."
        Write-Host "Check GitHub URL, and try adding again."
        Write-Host "Run the following: "
        Write-Host "    git remote rm origin"
        Write-Host "    git remote add origin FIXED_URL"
        Write-Host "    git push --set-upstream origin $(git symbolic-ref --short HEAD)"
        Write-Host "Once pushed, your firmware should be available from GitHub Actions at: $actions"
        exit 1
    }

    if ($github_repo -imatch "https") {
        $actions = "$($github_repo.substring(0, $github_repo.length - 4))/actions"
        Write-Host "Your firmware should be availalbe from GitHub Actions shortly: $actions"
    }
}