#requires -Version 5.1
<#
.SYNOPSIS
    CASAN Plan-20 agentic-client installer for Windows PowerShell.

.DESCRIPTION
    Installs, verifies (doctor) or removes the CASAN agentic-client integration
    (Claude Code and/or Codex project hooks) in a target repository — from a
    clean clone, with NO manual file copying. Every created file is recorded in a
    manifest so uninstall never touches a user's own config.

    The hooks call the CASAN agentic bridge, which never runs a model (Claude/
    Codex remains the sole model executor). See:
      docs/casan/CASAN_AGENTIC_CLIENTS_WINDOWS.md
      docs/casan/CASAN_AGENTIC_CLIENT_SECURITY.md

.PARAMETER Action
    install | doctor | uninstall   (default: install)

.PARAMETER Client
    claude | codex | all           (default: all)

.PARAMETER Target
    Target repository root. Default: the repo this script lives in.

.PARAMETER Mode
    observe | enforce              (default: observe)  — sets the bridge
    enforcement mode written into the target's .casan/agentic.env.

.EXAMPLE
    pwsh packages/casan-devkit/windows/install-agentic.ps1 -Client claude -Mode enforce

.EXAMPLE
    pwsh packages/casan-devkit/windows/install-agentic.ps1 -Action doctor -Client all
#>

[CmdletBinding()]
param(
    [ValidateSet('install', 'doctor', 'uninstall')] [string]$Action = 'install',
    [ValidateSet('claude', 'codex', 'all')]         [string]$Client = 'all',
    [string]$Target,
    [ValidateSet('observe', 'enforce')]             [string]$Mode = 'observe'
)

$ErrorActionPreference = 'Stop'

# ── Resolve roots ────────────────────────────────────────────────────────────
# This script lives at <repo>/packages/casan-devkit/windows/install-agentic.ps1
$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
$RepoRoot  = (Resolve-Path (Join-Path $ScriptDir '..\..\..')).Path
if (-not $Target) { $Target = $RepoRoot }
$Target = (Resolve-Path $Target).Path

$HarnessRel = 'packages\casan-harness'
$Bridge     = Join-Path $Target "$HarnessRel\scripts\python\agentic_bridge.py"
$ClaudeTpl  = Join-Path $Target "$HarnessRel\adapters\claude-code\settings.template.json"
$CodexHooks = Join-Path $Target "$HarnessRel\adapters\codex\hooks.template.json"
$CodexConf  = Join-Path $Target "$HarnessRel\adapters\codex\config.template.toml"
$ManifestDir = Join-Path $Target '.casan'
$Manifest    = Join-Path $ManifestDir 'agentic-install-manifest.json'

function Resolve-Python {
    foreach ($cand in @('python3', 'python', 'py')) {
        $cmd = Get-Command $cand -ErrorAction SilentlyContinue
        if ($cmd) {
            try { & $cmd.Source --version *> $null; if ($LASTEXITCODE -eq 0) { return $cmd.Source } } catch {}
        }
    }
    throw 'No working Python 3 interpreter found on PATH (need python3/python/py).'
}

function Write-Info($m) { Write-Host "[casan] $m" }
function Write-Ok($m)   { Write-Host "[casan] OK  $m" -ForegroundColor Green }
function Write-Warn2($m) { Write-Host "[casan] !!  $m" -ForegroundColor Yellow }
function Write-Err($m)  { Write-Host "[casan] ERR $m" -ForegroundColor Red }

function Load-Manifest {
    if (Test-Path $Manifest) {
        try { return Get-Content -Raw -Path $Manifest | ConvertFrom-Json } catch {}
    }
    return [PSCustomObject]@{ created = @(); clients = @() }
}

function Save-Manifest($m) {
    if (-not (Test-Path $ManifestDir)) { New-Item -ItemType Directory -Force -Path $ManifestDir | Out-Null }
    $m | ConvertTo-Json -Depth 6 | Set-Content -Path $Manifest -Encoding UTF8
}

# Copy a template into place. Never overwrite a user's existing config silently:
# back it up first and record both in the manifest so uninstall can restore it.
function Install-File($src, $dst, $manifest) {
    $dstDir = Split-Path -Parent $dst
    if (-not (Test-Path $dstDir)) { New-Item -ItemType Directory -Force -Path $dstDir | Out-Null }
    if (Test-Path $dst) {
        $backup = "$dst.casan-bak"
        if (-not (Test-Path $backup)) {
            Copy-Item -Path $dst -Destination $backup -Force
            Write-Warn2 "existing $([System.IO.Path]::GetFileName($dst)) backed up to $([System.IO.Path]::GetFileName($backup))"
        }
    }
    Copy-Item -Path $src -Destination $dst -Force
    $entry = @{ path = $dst; from = $src }
    $manifest.created = @($manifest.created + $dst | Select-Object -Unique)
    Write-Ok "installed $dst"
}

function Do-Install {
    if (-not (Test-Path $Bridge)) { throw "Bridge not found at $Bridge — is this a CASAN repo?" }
    $py = Resolve-Python
    $manifest = Load-Manifest
    $clients = @()

    if ($Client -in @('claude', 'all')) {
        Install-File $ClaudeTpl (Join-Path $Target '.claude\settings.json') $manifest
        $clients += 'claude'
    }
    if ($Client -in @('codex', 'all')) {
        Install-File $CodexHooks (Join-Path $Target '.codex\hooks.json') $manifest
        Install-File $CodexConf  (Join-Path $Target '.codex\config.toml') $manifest
        $clients += 'codex'
        Write-Warn2 'Codex loads project hooks only AFTER you accept its trust prompt — open the repo in Codex once to complete onboarding.'
    }

    # Bridge feature flags for the target (sourced by the user's shell/session).
    $envFile = Join-Path $Target '.casan\agentic.env'
    @(
        "# CASAN Plan-20 agentic bridge flags (Windows). Source before starting the client.",
        "CASAN_AGENTIC_BRIDGE_ENABLED=1",
        "CASAN_AGENTIC_ENFORCEMENT_MODE=$Mode",
        "CASAN_AGENTIC_INTEGRATION_MODE=project_hook"
    ) | Set-Content -Path $envFile -Encoding UTF8
    $manifest.created = @($manifest.created + $envFile | Select-Object -Unique)
    Write-Ok "wrote flags -> $envFile (mode=$Mode)"

    $manifest.clients = @($clients | Select-Object -Unique)
    Save-Manifest $manifest

    Write-Info 'Running doctor to verify...'
    Do-Doctor
    Write-Info "Install complete. Set CASAN_AGENTIC_ENFORCEMENT_MODE=enforce when ready to certify turns."
}

function Do-Doctor {
    $py = Resolve-Python
    Write-Info "python  : $py"
    Write-Info "target  : $Target"
    Write-Info "bridge  : $Bridge"
    if (-not (Test-Path $Bridge)) { Write-Err 'bridge missing'; exit 1 }

    # Core bridge self-diagnostics.
    & $py $Bridge doctor
    if ($LASTEXITCODE -ne 0) { Write-Err 'bridge doctor reported a problem'; }

    $ok = $true
    if ($Client -in @('claude', 'all')) {
        if (Test-Path (Join-Path $Target '.claude\settings.json')) { Write-Ok '.claude\settings.json present' }
        else { Write-Warn2 '.claude\settings.json missing (run install)'; $ok = $false }
    }
    if ($Client -in @('codex', 'all')) {
        if (Test-Path (Join-Path $Target '.codex\hooks.json')) { Write-Ok '.codex\hooks.json present (Codex trust review still required)' }
        else { Write-Warn2 '.codex\hooks.json missing (run install)'; $ok = $false }
    }

    # A real begin->finalize smoke turn against an isolated state dir.
    $tmp = Join-Path ([System.IO.Path]::GetTempPath()) ("casan-agentic-" + [guid]::NewGuid().ToString('N'))
    $env:CASAN_STATE_ROOT = (Join-Path $tmp '.specify')
    try {
        $begin = '{"op":"begin","client":"claude-code","project":"' + ($Target -replace '\\','/') + '","session":"doctor","prompt":"doctor smoke","integration_mode":"project_hook"}'
        $resp = $begin | & $py $Bridge run | ConvertFrom-Json
        if ($resp.decision -eq 'allow') { Write-Ok "smoke begin admitted (strength=$($resp.certification_strength))" }
        else { Write-Warn2 "smoke begin decision=$($resp.decision)"; }
    } finally {
        Remove-Item -Recurse -Force $tmp -ErrorAction SilentlyContinue
        Remove-Item Env:\CASAN_STATE_ROOT -ErrorAction SilentlyContinue
    }
    if ($ok) { Write-Ok 'doctor passed' } else { Write-Warn2 'doctor found missing config' }
}

function Do-Uninstall {
    $manifest = Load-Manifest
    if (-not $manifest.created -or $manifest.created.Count -eq 0) {
        Write-Warn2 'no install manifest found — nothing to remove'
        return
    }
    foreach ($f in $manifest.created) {
        if (Test-Path $f) {
            Remove-Item -Force $f
            Write-Ok "removed $f"
        }
        $backup = "$f.casan-bak"
        if (Test-Path $backup) {
            Move-Item -Force $backup $f
            Write-Ok "restored user's original $f from backup"
        }
    }
    Remove-Item -Force $Manifest -ErrorAction SilentlyContinue
    Write-Info 'Uninstall complete — your own (non-CASAN) config was preserved.'
}

switch ($Action) {
    'install'   { Do-Install }
    'doctor'    { Do-Doctor }
    'uninstall' { Do-Uninstall }
}