# Pushes this folder to the Gitea repo.
#
# Run from PowerShell inside the visitor-signin folder:
#     .\push-to-gitea.ps1
# If Windows blocks it:
#     powershell -ExecutionPolicy Bypass -File .\push-to-gitea.ps1

$Remote = 'https://gitea.hideawaygaming.com.au/jessikitty/visitor-signin.git'

# git reports failure through its exit code, not as a PowerShell error, so every
# call has to be checked. Without this the script reports success after a
# rejected push, which is exactly what it used to do.
function Invoke-Git {
    param([Parameter(ValueFromRemainingArguments = $true)][string[]]$Arguments)
    & git @Arguments
    return $LASTEXITCODE
}

function Fail($message) {
    Write-Host ''
    Write-Host $message -ForegroundColor Red
    exit 1
}

if (-not (Test-Path 'package.json')) { Fail 'Run this from inside the visitor-signin folder.' }
if (-not (Get-Command git -ErrorAction SilentlyContinue)) {
    Fail 'Git is not installed or not on PATH. Get it from https://git-scm.com/download/win'
}

# Keeps line endings sane between Windows and the Ubuntu docker host.
git config --global core.autocrlf input | Out-Null

if (-not (Test-Path '.git')) {
    Write-Host 'Setting up a new local repository...'
    if ((Invoke-Git init -b main) -ne 0) { Fail 'git init failed.' }
}

if ((git remote) -match '^origin$') {
    git remote set-url origin $Remote
} else {
    git remote add origin $Remote
}

# ------------------------------------------------- finish what was started

# A rebase or merge left half-done blocks everything that follows, and the error
# git gives is easy to mistake for a push problem. Catch it here and say plainly
# what to do.
$gitDir = (git rev-parse --git-dir 2>$null)
if ($gitDir) {
    $stuck = @('rebase-merge', 'rebase-apply', 'MERGE_HEAD', 'CHERRY_PICK_HEAD') |
        Where-Object { Test-Path (Join-Path $gitDir $_) }
    if ($stuck) {
        Write-Host ''
        Write-Host 'There is an unfinished rebase or merge in this folder.' -ForegroundColor Red
        Write-Host 'Nothing else can happen until it is settled. Your options:' -ForegroundColor Yellow
        Write-Host ''
        Write-Host '  git rebase --abort     throw the attempt away and go back to how things were'
        Write-Host '  git status             see which files still need attention'
        Write-Host '  git rebase --continue   after fixing the files git listed'
        Write-Host ''
        Write-Host 'If you are unsure, "git rebase --abort" is the safe one. It puts the' -ForegroundColor Yellow
        Write-Host 'folder back exactly as it was before the rebase started.' -ForegroundColor Yellow
        exit 1
    }
}

# ---------------------------------------------------------------- commit

git add -A
$pending = git status --porcelain
if ($pending) {
    $message = Read-Host 'Describe this change (press enter for a dated default)'
    if (-not $message) { $message = "Update $(Get-Date -Format 'yyyy-MM-dd HH:mm')" }
    if ((Invoke-Git commit -m $message) -ne 0) { Fail 'git commit failed.' }
    Write-Host 'Committed.' -ForegroundColor Green
} else {
    Write-Host 'No file changes to commit. Checking for anything unpushed...' -ForegroundColor Yellow
}

# ------------------------------------------------------- catch up, then push

Write-Host 'Checking what is on the server...'
if ((Invoke-Git fetch origin) -ne 0) {
    Fail 'Could not reach Gitea. Check the network and your sign in details.'
}

if (git ls-remote --heads origin main) {
    $behind = (git rev-list --count HEAD..origin/main 2>$null)
    if ($behind -and [int]$behind -gt 0) {
        Write-Host "The server has $behind commit(s) this folder does not. Replaying your work on top..."
        if ((Invoke-Git pull --rebase origin main) -ne 0) {
            Write-Host ''
            Write-Host 'The two histories could not be joined automatically.' -ForegroundColor Red
            Write-Host ''
            Write-Host 'See what is on the server that you do not have:' -ForegroundColor Yellow
            Write-Host '    git log --oneline HEAD..origin/main'
            Write-Host ''
            Write-Host 'If that is nothing you need, and this folder is the good copy:' -ForegroundColor Yellow
            Write-Host '    git push --force-with-lease origin main'
            exit 1
        }
    }
}

if ((Invoke-Git push -u origin main) -ne 0) {
    Fail 'The push was rejected. Read the message above. Nothing was sent.'
}

Write-Host ''
Write-Host 'Pushed successfully.' -ForegroundColor Green
Write-Host 'https://gitea.hideawaygaming.com.au/jessikitty/visitor-signin'