$ErrorActionPreference = 'Stop'

param(
    [switch]$Quick
)

$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
$RepoRoot = Split-Path -Parent $ScriptDir
$CanonicalHome = if ($env:COPILOT_RESOURCES_HOME) { $env:COPILOT_RESOURCES_HOME } else { Join-Path $HOME '.copilot-resources' }
$CopilotHome = if ($env:COPILOT_HOME) { $env:COPILOT_HOME } else { Join-Path $HOME '.copilot' }
$VscodeUserDir = if ($env:VSCODE_USER_DIR) { $env:VSCODE_USER_DIR } else { Join-Path $env:APPDATA 'Code\User' }

function Assert-Path {
    param(
        [string]$Label,
        [string]$Path
    )

    if (Test-Path -LiteralPath $Path) {
        Write-Host "[ok] $Label: $Path"
    } else {
        throw "Missing $Label: $Path"
    }
}

function Assert-Command {
    param(
        [string]$Label,
        [string]$CommandName
    )

    if (Get-Command $CommandName -ErrorAction SilentlyContinue) {
        Write-Host "[ok] $Label: $CommandName"
    } else {
        throw "Missing $Label: $CommandName"
    }
}

function Assert-ReadableFile {
    param(
        [string]$Label,
        [string]$Path
    )

    if ((Test-Path -LiteralPath $Path -PathType Leaf) -and (Get-Item -LiteralPath $Path).PSIsContainer -eq $false) {
        Write-Host "[ok] $Label: $Path"
    } else {
        throw "Unreadable $Label: $Path"
    }
}

Assert-Path -Label 'repo root' -Path $RepoRoot
Assert-Path -Label 'canonical home' -Path $CanonicalHome
Assert-Path -Label 'skills link' -Path (Join-Path $CopilotHome 'skills')
Assert-Path -Label 'agents link' -Path (Join-Path $CopilotHome 'agents')
Assert-Path -Label 'instructions link' -Path (Join-Path $CopilotHome 'instructions')
Assert-Path -Label 'hooks link' -Path (Join-Path $CopilotHome 'hooks')
Assert-Path -Label 'session start hook' -Path (Join-Path $CanonicalHome 'resources\hooks\session-audit.json')
Assert-Path -Label 'session start hook script' -Path (Join-Path $CanonicalHome 'resources\scripts\report-hook-event.sh')
Assert-ReadableFile -Label 'session start hook script' -Path (Join-Path $CanonicalHome 'resources\scripts\report-hook-event.sh')
Assert-Command -Label 'session start hook shell' -CommandName 'bash'
Assert-Path -Label 'prompts link' -Path (Join-Path $VscodeUserDir 'prompts')
Assert-Path -Label 'VS Code MCP config' -Path (Join-Path $VscodeUserDir 'mcp.json')
Assert-Path -Label 'Copilot CLI MCP config' -Path (Join-Path $CopilotHome 'mcp-config.json')
Assert-Path -Label 'local MCP overrides' -Path (Join-Path $CanonicalHome '.local\mcp.local.jsonc')

if (-not $Quick) {
    Assert-Path -Label 'VS Code settings template' -Path (Join-Path $RepoRoot 'config\vscode\settings.template.jsonc')
    Assert-Path -Label 'CLI env template' -Path (Join-Path $RepoRoot 'config\copilot-cli\env.example.ps1')
    Assert-Path -Label 'VS Code MCP template' -Path (Join-Path $RepoRoot 'config\mcp\vscode.mcp.template.jsonc')
    Assert-Path -Label 'Copilot CLI MCP template' -Path (Join-Path $RepoRoot 'config\mcp\copilot-cli.mcp.template.jsonc')
    Assert-Path -Label 'MCP local override example' -Path (Join-Path $RepoRoot 'config\mcp\local-overrides.example.jsonc')
    Assert-Path -Label 'Copilot CLI filesystem wrapper' -Path (Join-Path $RepoRoot 'install\mcp\copilot-cli-filesystem-wrapper.mjs')
}