# install.ps1 — Link claude-meta config into ~/.claude/
$ErrorActionPreference = "Stop"

$repoRoot = Split-Path -Parent (Split-Path -Parent $MyInvocation.MyCommand.Path)
$sourceDir = Join-Path $repoRoot "home-claude"
$claudeDir = Join-Path $env:USERPROFILE ".claude"

# Verify source exists
if (-not (Test-Path $sourceDir)) {
    Write-Host "ERROR: home-claude/ not found at $sourceDir" -ForegroundColor Red
    exit 1
}

# Ensure ~/.claude/ is a real directory (never a symlink!)
if (Test-Path $claudeDir) {
    $item = Get-Item $claudeDir -Force
    if ($item.Attributes -band [System.IO.FileAttributes]::ReparsePoint) {
        Write-Host "ERROR: ~/.claude/ is a symlink/junction. It must be a real directory." -ForegroundColor Red
        Write-Host "Claude Code Bug #764: symlinked ~/.claude/ breaks file detection." -ForegroundColor Red
        exit 1
    }
} else {
    New-Item -ItemType Directory -Path $claudeDir -Force | Out-Null
    Write-Host "Created ~/.claude/" -ForegroundColor Cyan
}

# Verify same volume for junctions
$sourceVolume = (Get-Item $sourceDir).PSDrive.Name
$targetVolume = (Get-Item $claudeDir).PSDrive.Name
if ($sourceVolume -ne $targetVolume) {
    Write-Host "WARNING: Source ($sourceVolume`:) and target ($targetVolume`:) are on different volumes." -ForegroundColor Yellow
    Write-Host "Junctions require same volume. Falling back to file copy for directories." -ForegroundColor Yellow
    $useJunctions = $false
} else {
    $useJunctions = $true
}

Write-Host ""
Write-Host "Installing claude-meta config..." -ForegroundColor Cyan
Write-Host "  Source: $sourceDir" -ForegroundColor Gray
Write-Host "  Target: $claudeDir" -ForegroundColor Gray
Write-Host ""

$success = $true

# --- File Symlinks ---
$files = @("CLAUDE.md", "settings.json")
foreach ($file in $files) {
    $src = Join-Path $sourceDir $file
    $dst = Join-Path $claudeDir $file

    if (-not (Test-Path $src)) {
        Write-Host "  SKIP: $file (not in repo)" -ForegroundColor Yellow
        continue
    }

    # Remove existing file/link
    if (Test-Path $dst) {
        Remove-Item $dst -Force
    }

    # Try symlink first
    try {
        New-Item -ItemType SymbolicLink -Path $dst -Target $src -ErrorAction Stop | Out-Null
        Write-Host "  SYMLINK: $file -> $src" -ForegroundColor Green
    } catch {
        # Fallback: copy
        Write-Host "  WARNING: Symlink failed for $file (need Developer Mode?). Using copy." -ForegroundColor Yellow
        Copy-Item $src $dst -Force
        Write-Host "  COPY: $file (changes won't auto-sync!)" -ForegroundColor Yellow
        $success = $false
    }
}

# --- Directory Junctions ---
$dirs = @("skills", "rules")
foreach ($dir in $dirs) {
    $src = Join-Path $sourceDir $dir
    $dst = Join-Path $claudeDir $dir

    if (-not (Test-Path $src)) {
        Write-Host "  SKIP: $dir/ (not in repo)" -ForegroundColor Yellow
        continue
    }

    # Remove existing dir/junction
    if (Test-Path $dst) {
        $item = Get-Item $dst -Force
        if ($item.Attributes -band [System.IO.FileAttributes]::ReparsePoint) {
            # It's a junction/symlink — remove it
            cmd /c "rmdir `"$dst`"" 2>$null
        } else {
            Remove-Item $dst -Recurse -Force
        }
    }

    if ($useJunctions) {
        # Junction (no admin needed, same volume only)
        cmd /c "mklink /J `"$dst`" `"$src`"" | Out-Null
        if ($LASTEXITCODE -eq 0) {
            Write-Host "  JUNCTION: $dir/ -> $src" -ForegroundColor Green
        } else {
            # Fallback: copy
            Copy-Item $src $dst -Recurse -Force
            Write-Host "  COPY: $dir/ (changes won't auto-sync!)" -ForegroundColor Yellow
            $success = $false
        }
    } else {
        Copy-Item $src $dst -Recurse -Force
        Write-Host "  COPY: $dir/ (different volume)" -ForegroundColor Yellow
        $success = $false
    }
}

# --- Validation ---
Write-Host ""
Write-Host "Validating..." -ForegroundColor Cyan

$valid = $true
foreach ($file in $files) {
    $dst = Join-Path $claudeDir $file
    if (Test-Path $dst) {
        $content = Get-Content $dst -Raw -ErrorAction SilentlyContinue
        if ($content) {
            Write-Host "  OK: $file readable" -ForegroundColor Green
        } else {
            Write-Host "  FAIL: $file exists but empty/unreadable" -ForegroundColor Red
            $valid = $false
        }
    } else {
        Write-Host "  FAIL: $file not found" -ForegroundColor Red
        $valid = $false
    }
}

foreach ($dir in $dirs) {
    $dst = Join-Path $claudeDir $dir
    if (Test-Path $dst) {
        $count = (Get-ChildItem $dst -Recurse -File).Count
        Write-Host "  OK: $dir/ ($count files)" -ForegroundColor Green
    } else {
        Write-Host "  FAIL: $dir/ not found" -ForegroundColor Red
        $valid = $false
    }
}

# --- Summary ---
Write-Host ""
if ($valid) {
    Write-Host "Installation complete!" -ForegroundColor Green
    if (-not $success) {
        Write-Host ""
        Write-Host "NOTE: Some items were copied instead of linked." -ForegroundColor Yellow
        Write-Host "Enable Developer Mode (Settings > Developer) for symlinks," -ForegroundColor Yellow
        Write-Host "or re-run after changes with: .\scripts\install.ps1" -ForegroundColor Yellow
    }
} else {
    Write-Host "Installation had errors. Check output above." -ForegroundColor Red
    exit 1
}