#!/usr/bin/env pwsh

<#
.SYNOPSIS
Runs flake8 to analyze Python source code for errors and best practices.
#>

# Get path.
$scriptDir = Split-Path $PSCommandPath -Parent
$projectDir = (Get-Item $scriptDir).Parent

# Set working directory to root of project.
Push-Location $projectDir

# Get the diff for the current branch.
$ExitCode = 0
$GitDiff = git diff origin/master

# If there is no diff between master, then flake8 everything.
if ( $null -eq $GitDiff ) {
    flake8 .
    if ($LastExitCode -ne 0) { $ExitCode = $LastExitCode }
}
# Else flake8 just the diff.
else {
    Write-Output $GitDiff | flake8 --diff
    if ($LastExitCode -ne 0) { $ExitCode = $LastExitCode }
    # If the project_template changed, then flake8 the testproject too.
    $GitDiffTempl = Write-Output $GitDiff | Select-String -Pattern "^diff .*/project_template/.*"
    if ( $null -ne $GitDiffTempl ) {
        flake8 testproject
        if ($LastExitCode -ne 0) { $ExitCode = $LastExitCode }
    }
}

# Write output for humans.
if ($ExitCode -eq 0) {
    Write-Host -ForegroundColor Green "[✔] Flake8 passed with no errors"
}
else {
    # Write the error in a way that shows up as the failure reason in Azure Pipelines.
    Write-Host "##vso[task.LogIssue type=error;]Flake8 exited with errors. Please resolve issues above."
}

# Unset working directory and exit with flake8's exit code.
Pop-Location
exit $ExitCode