#!/usr/bin/env pwsh

<#
.SYNOPSIS
    Updates the build tools version and generates a commit message with the list of changes
.PARAMETER RepoRoot
    The directory containing the repo
.PARAMETER GitCommitArgs
    Additional arguments to pass into git-commit
.PARAMETER NoCommit
    Make changes without executing git-commit
.PARAMETER Force
    Specified this to make a commit with any changes
#>
[cmdletbinding(SupportsShouldProcess = $true)]
param(
    [string]$RepoRoot,
    [string[]]$GitCommitArgs = @(),
    [switch]$NoCommit,
    [switch]$Force
)

$ErrorActionPreference = 'Stop'
Set-StrictMode -Version 2

if (-not $RepoRoot) {
    $RepoRoot = Resolve-Path "$PSScriptRoot\.."
}

Import-Module "$PSScriptRoot/common.psm1" -Scope Local -Force

function Get-KoreBuildVersion {
    $lockFile = "$RepoRoot/korebuild-lock.txt"
    if (!(Test-Path $lockFile)) {
        return ''
    }
    $version = Get-Content $lockFile | Where-Object { $_ -like 'version:*' } | Select-Object -first 1
    if (!$version) {
        Write-Error "Failed to parse version from $lockFile. Expected a line that begins with 'version:'"
    }
    $version = $version.TrimStart('version:').Trim()
    return $version
}

Push-Location $RepoRoot
try {
    Assert-Git

    $oldVersion = Get-KoreBuildVersion

    # Executes a command that no-ops. The only thing we really need is the updated version of korebuild-lock.txt
    & "$RepoRoot/run.ps1" -Update --help | Out-Null

    $newVersion = Get-KoreBuildVersion

    if ($oldVersion -eq $newVersion) {
        Write-Host -ForegroundColor Magenta 'No changes to build tools'
        exit 0
    }

    $deps = Get-Content "$RepoRoot/build/dependencies.props" `
    | % {
        if ($_ -like '*<InternalAspNetCoreSdkPackageVersion>*') {
            "    <InternalAspNetCoreSdkPackageVersion>$newVersion</InternalAspNetCoreSdkPackageVersion>"
        } else {
            $_
        }
    }
    $deps | Set-Content -Encoding UTF8 "$RepoRoot/build/dependencies.props"

    Invoke-Block { git add "$RepoRoot/korebuild-lock.txt" }
    Invoke-Block { git add "$RepoRoot/build/dependencies.props" }

    $shortMessage = "Updating BuildTools from $oldVersion to $newVersion"
    # add this to the commit message to make it possible to filter commit triggers based on message
    $message = "$shortMessage`n`n[auto-updated: buildtools]"

    if (-not $NoCommit -and ($Force -or ($PSCmdlet.ShouldContinue($shortMessage, 'Create a new commit with these changes?')))) {
        Invoke-Block { git commit -m $message @GitCommitArgs }
    }
    else {
        # If composing this script with others, return the message that would have been used
        return @{
            message = $message
        }
    }
}
finally {
    Pop-Location
}