# update.ps1 -- Full uplift cycle for claude-skills on Windows (PowerShell)
#
# Steps:
#   1. git pull --ff-only in claude-skills repo
#   2. Conditionally rebuild projects-meta-mcp (if source changed)
#   3. Conditionally rebuild interns-mcp (if source changed)
#   4. Install all skills via install.ps1
#   5. Show version diff (before -> after)
#   6. Print reload hints
#
# Usage: update.ps1 [-Yes]
#   -Yes  -- skip confirmation prompts (assume yes)

[CmdletBinding()]
param(
    [switch]$Yes
)

$ErrorActionPreference = 'Stop'

# -- Paths -------------------------------------------------------------------

$root = Split-Path -Parent $PSScriptRoot
$skillsSrc = Join-Path $root 'skills'
$target = if ($env:CLAUDE_SKILLS_DIR) { $env:CLAUDE_SKILLS_DIR } else { Join-Path $env:USERPROFILE '.claude\skills' }

$commonRoot = if ($env:COMMON_ROOT) { $env:COMMON_ROOT } else { Join-Path $env:USERPROFILE 'projects\.common' }
$metaMcp = Join-Path $commonRoot 'lib\projects-meta-mcp'
$internsMcp = Join-Path $commonRoot 'lib\interns-mcp'

# -- Collect before-versions --------------------------------------------------

$beforeVersions = @{}
if (Test-Path $target) {
    Get-ChildItem -Path $target -Directory -ErrorAction SilentlyContinue | ForEach-Object {
        $vf = Join-Path $_.FullName 'SKILL.md'
        if (Test-Path $vf) {
            $match = Select-String -Path $vf -Pattern '^version:\s*(\d+\.\d+\.\d+)' -ErrorAction SilentlyContinue | Select-Object -First 1
            $ver = if ($match) { $match.Matches.Groups[1].Value } else { '?' }
            $beforeVersions[$_.Name] = $ver
        }
    }
}

# -- Step 1: git pull ---------------------------------------------------------

Write-Host "`n[update] Pulling claude-skills repo..." -ForegroundColor Cyan
Push-Location $root

$dirty = git status --porcelain 2>$null
if ($LASTEXITCODE -ne 0) { $dirty = $true }
if ($dirty) {
    Write-Host "[warn] Working tree has uncommitted changes. Stashing..." -ForegroundColor Yellow
    git stash push -m 'update-ps1-auto-stash'
    if ($LASTEXITCODE -ne 0) { Write-Error "Cannot stash changes"; Pop-Location; exit 1 }
    $stashed = $true
} else {
    $stashed = $false
}

git pull --ff-only
if ($LASTEXITCODE -ne 0) {
    Write-Error "git pull --ff-only failed (diverged or no upstream)"
    Pop-Location; exit 1
}
Write-Host "[ok] Repo updated." -ForegroundColor Green

if ($stashed) {
    Write-Host "[update] Popping stashed changes..." -ForegroundColor Cyan
    git stash pop 2>$null
    if ($LASTEXITCODE -ne 0) {
        Write-Host "[warn] Could not pop stash -- resolve manually" -ForegroundColor Yellow
    }
}

# -- Step 2: projects-meta-mcp -----------------------------------------------

$mcpRebuilt = $false

if (Test-Path (Join-Path $metaMcp '.git')) {
    Write-Host "[update] Checking projects-meta-mcp..." -ForegroundColor Cyan
    Push-Location $metaMcp
    $preSha = git rev-parse HEAD
    git pull --ff-only 2>$null
    if ($LASTEXITCODE -ne 0) {
        Write-Host "[warn] projects-meta-mcp: pull failed or no upstream" -ForegroundColor Yellow
    }
    $postSha = git rev-parse HEAD

    if ($preSha -ne $postSha) {
        Write-Host "[update] Source changed, rebuilding projects-meta-mcp..." -ForegroundColor Cyan
        npm run build 2>$null
        if ($LASTEXITCODE -ne 0) {
            npm install; npm run build
        }
        Write-Host "[ok] projects-meta-mcp rebuilt." -ForegroundColor Green
        $mcpRebuilt = $true
    } else {
        Write-Host "[ok] projects-meta-mcp: up to date." -ForegroundColor Green
    }
    Pop-Location
} else {
    Write-Host "[warn] projects-meta-mcp not found at $metaMcp -- skipping." -ForegroundColor Yellow
}

# -- Step 3: interns-mcp -----------------------------------------------------

if (Test-Path (Join-Path $internsMcp '.git')) {
    Write-Host "[update] Checking interns-mcp..." -ForegroundColor Cyan
    Push-Location $internsMcp
    $preSha = git rev-parse HEAD
    git pull --ff-only 2>$null
    if ($LASTEXITCODE -ne 0) {
        Write-Host "[warn] interns-mcp: pull failed or no upstream" -ForegroundColor Yellow
    }
    $postSha = git rev-parse HEAD

    if ($preSha -ne $postSha) {
        Write-Host "[update] Source changed, reinstalling interns-mcp..." -ForegroundColor Cyan
        pip install -e . 2>$null
        if ($LASTEXITCODE -ne 0) { pip3 install -e . }
        Write-Host "[ok] interns-mcp reinstalled." -ForegroundColor Green
        $mcpRebuilt = $true
    } else {
        Write-Host "[ok] interns-mcp: up to date." -ForegroundColor Green
    }
    Pop-Location
} else {
    Write-Host "[warn] interns-mcp not found at $internsMcp -- skipping." -ForegroundColor Yellow
}

# -- Step 4: Install skills ---------------------------------------------------

Pop-Location
Write-Host "[update] Installing skills..." -ForegroundColor Cyan
& "$root\scripts\install.ps1"
Write-Host "[ok] Skills installed." -ForegroundColor Green

# -- Step 5: Version diff -----------------------------------------------------

Write-Host "[update] Version diff:" -ForegroundColor Cyan
$changes = $false
Get-ChildItem -Path $target -Directory -ErrorAction SilentlyContinue | ForEach-Object {
    $vf = Join-Path $_.FullName 'SKILL.md'
    if (Test-Path $vf) {
        $match = Select-String -Path $vf -Pattern '^version:\s*(\d+\.\d+\.\d+)' -ErrorAction SilentlyContinue | Select-Object -First 1
        $after = if ($match) { $match.Matches.Groups[1].Value } else { '?' }
        $before = $beforeVersions[$_.Name]
        if (-not $before) { $before = 'new' }
        if ($before -ne $after) {
            Write-Host "  $before -> $after  ($($_.Name))"
            $changes = $true
        }
    }
}
if (-not $changes) {
    Write-Host '  (no version changes)'
}

# -- Step 6: New setup-skills hint -------------------------------------------

$newSetup = @()
Get-ChildItem -Path $skillsSrc -Directory | ForEach-Object {
    $name = $_.Name
    if ($name -like 'setup-*' -and -not (Test-Path (Join-Path $target $name))) {
        $newSetup += $name
    }
}

if ($newSetup.Count -gt 0) {
    Write-Host ''
    Write-Host '[update] New setup skills available:' -ForegroundColor Cyan
    $newSetup | ForEach-Object { Write-Host "  - $_" }
    Write-Host '  Run the setup skill to configure it.'
}

# -- Step 7: Reload hints ----------------------------------------------------

Write-Host ''
Write-Host '[ok] Update complete!' -ForegroundColor Green
if ($mcpRebuilt) {
    Write-Host '  -> Run /reload-mcp to reload MCP servers (source changed)'
}
Write-Host '  -> Start a new Claude session for skill changes to take full effect'