[CmdletBinding()]
param(
    [Alias("h")]
    [switch]$Help,
    [switch]$RunSmoke,
    [switch]$RunSpacetimeBuild
)

$ErrorActionPreference = "Stop"

function Write-Usage {
    @(
        'Usage:',
        '  ./server-rs/scripts/m7-preflight.ps1',
        '  ./server-rs/scripts/m7-preflight.ps1 -RunSmoke',
        '  ./server-rs/scripts/m7-preflight.ps1 -RunSpacetimeBuild',
        '',
        'Notes:',
        '  1. Run M7 cutover preflight checks for Rust backend',
        '  2. Default checks are non-destructive and do not publish or clear SpacetimeDB data',
        '  3. -RunSmoke starts a temporary api-server and verifies /healthz contract',
        '  4. -RunSpacetimeBuild requires spacetime CLI and only builds the module'
    ) -join [Environment]::NewLine
}

if ($Help) {
    Write-Usage
    exit 0
}

$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
$serverRsDir = Split-Path -Parent $scriptDir
$repoRoot = Split-Path -Parent $serverRsDir
$manifestPath = Join-Path $serverRsDir "Cargo.toml"
$modulePath = Join-Path $serverRsDir "crates\spacetime-module"

if (-not (Test-Path $manifestPath)) {
    throw "Missing server-rs/Cargo.toml, cannot start M7 preflight."
}

Write-Host "[m7:preflight] repo root: $repoRoot"
Write-Host "[m7:preflight] server-rs: $serverRsDir"

Push-Location $serverRsDir
try {
    Write-Host "[m7:preflight] step: cargo check -p spacetime-module"
    cargo check -p spacetime-module --manifest-path $manifestPath

    Write-Host "[m7:preflight] step: cargo check -p api-server"
    cargo check -p api-server --manifest-path $manifestPath

    Write-Host "[m7:preflight] step: cargo test -p shared-contracts"
    cargo test -p shared-contracts --manifest-path $manifestPath

    if ($RunSpacetimeBuild) {
        $spacetimeCommand = Get-Command spacetime -ErrorAction SilentlyContinue
        if ($null -eq $spacetimeCommand) {
            throw "Missing spacetime CLI, cannot run spacetime build."
        }

        Write-Host "[m7:preflight] step: spacetime build --debug"
        Push-Location $modulePath
        try {
            & $spacetimeCommand.Source build --debug
        }
        finally {
            Pop-Location
        }
    }
}
finally {
    Pop-Location
}

if ($RunSmoke) {
    Write-Host "[m7:preflight] step: server-rs smoke"
    & (Join-Path $serverRsDir "scripts\smoke.ps1")
}

Write-Host "[m7:preflight] all checks passed"