# 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 is called directly and $LASTEXITCODE checked straight afterwards. Wrapping
# it in a function does not work: a PowerShell function returns everything written
# to the output stream, so the caller receives git's console output as well as the
# exit code, and comparing that array against 0 reports failure every time.
function Fail($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'
}

git config --global core.autocrlf input | Out-Null

# git refuses to commit without an identity, and says so in a way that is easy to
# miss among its other output.
$who = git config user.email
if (-not $who) { $who = git config --global user.email }
if (-not $who) {
    Write-Host 'Git does not know who you are. Set that once:' -ForegroundColor Yellow
    Write-Host '    git config --global user.email "you@example.com"'
    Write-Host '    git config --global user.name "Your Name"'
    Fail 'Nothing was committed.'
}

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

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

# Whatever branch is checked out, not a hard-coded one. Pushing 'main' while the
# work sits on 'deploy' reports "Everything up-to-date" and sends nothing.
$branch = (git rev-parse --abbrev-ref HEAD).Trim()
if (-not $branch -or $branch -eq 'HEAD') { Fail 'No branch is checked out here.' }
Write-Host "Branch: $branch" -ForegroundColor Cyan

# ------------------------------------------- an unfinished rebase blocks everything

$gitDir = git rev-parse --git-dir 2>$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 here.' -ForegroundColor Red
        Write-Host '  git rebase --abort      throw it away, back to how things were'
        Write-Host '  git status              see which files need attention'
        Write-Host '  git rebase --continue   after fixing those files'
        Fail 'Nothing was done.'
    }
}

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

git add -A
if (git status --porcelain) {
    $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')" }
    git commit -m $message
    if ($LASTEXITCODE -ne 0) { Fail 'git commit failed. The message above says why.' }
    Write-Host 'Committed.' -ForegroundColor Green
} else {
    Write-Host 'Nothing new to commit.' -ForegroundColor Yellow
}

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

git fetch origin
if ($LASTEXITCODE -ne 0) { Fail 'Could not reach Gitea. Check the network and your sign in details.' }

if (git ls-remote --heads origin $branch) {
    $behind = git rev-list --count "HEAD..origin/$branch" 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..."
        git pull --rebase origin $branch
        if ($LASTEXITCODE -ne 0) {
            Write-Host ''
            Write-Host 'The two histories could not be joined automatically.' -ForegroundColor Red
            Write-Host "  git log --oneline HEAD..origin/$branch      what is on the server"
            Write-Host "  git push --force-with-lease origin $branch  if this folder is the good copy"
            Fail 'Nothing was sent.'
        }
    }
} else {
    Write-Host "Branch '$branch' is not on the server yet; it will be created."
}

git push -u origin $branch
if ($LASTEXITCODE -ne 0) { Fail 'The push was rejected. The message above says why. Nothing was sent.' }

Write-Host ''
Write-Host "Pushed $branch successfully." -ForegroundColor Green
git log --oneline -1
Write-Host 'https://gitea.hideawaygaming.com.au/jessikitty/visitor-signin'