<#
.SYNOPSIS
  Reconstruct the state of lights-out runs for Companion polling and Morning Review.
.DESCRIPTION
  Reads the durable registry at ~\.scout\lights-out\runs.json and, for each run, re-derives
  live facts from git and gnhf's own artifacts. Safe to call from a brand-new Scout session
  that has no memory of the conversation that launched the run.
.EXAMPLE
  .\check-run.ps1 -Latest
.EXAMPLE
  .\check-run.ps1 -Since 1 -Json
#>
[CmdletBinding()]
param(
    [string]$Id,
    [switch]$Latest,
    [switch]$Active,
    [int]$Since = 0,
    [int]$NotesTail = 40,
    [switch]$Json
)

Set-StrictMode -Version Latest
$ErrorActionPreference = 'Stop'

. (Join-Path $PSScriptRoot 'lib.ps1')

$runs = @(Read-LightsOutRuns)
if ($runs.Count -eq 0) {
    if ($Json) { '[]' } else { Write-Host 'No lights-out runs have ever been registered.' }
    return
}

$runs = $runs | Sort-Object { [datetime]::Parse($_.startedAt) } -Descending

if ($Id) { $runs = @($runs | Where-Object { $_.id -eq $Id }) }
if ($Active) { $runs = @($runs | Where-Object { $_.status -in @('running', 'launching', 'finalizing') }) }
if ($Since -gt 0) {
    $cutoff = (Get-Date).AddDays(-$Since)
    $runs = @($runs | Where-Object { [datetime]::Parse($_.startedAt) -ge $cutoff })
}
if ($Latest) { $runs = @($runs | Select-Object -First 1) }

$results = foreach ($run in $runs) {
    $alive = $false
    if ($run.PSObject.Properties['workerPid'] -and $run.workerPid) {
        $alive = Test-LightsOutProcessAlive -ProcessId ([int]$run.workerPid) -StartedAtIso $run.startedAt
    }

    $runDir = $null
    if (Test-Path -LiteralPath $run.repoPath) {
        $runDir = Resolve-LightsOutRunDir -RepoPath $run.repoPath -RunId $run.id
    }

    $endState = $null
    if ($runDir) {
        $esPath = Join-Path $runDir 'end-state.json'
        if (Test-Path -LiteralPath $esPath) {
            try { $endState = Get-Content -LiteralPath $esPath -Raw | ConvertFrom-Json } catch { }
        }
    }

    $commits = @()
    $diffStat = ''
    $branchExists = $false
    if ((Test-Path -LiteralPath $run.repoPath) -and $run.baseCommit) {
        $branchExists = [bool](git -C $run.repoPath rev-parse --verify --quiet $run.branch 2>$null)
        $ref = if ($branchExists) { $run.branch } else { 'HEAD' }
        $commits = @(git -C $run.repoPath --no-pager log --oneline "$($run.baseCommit)..$ref" 2>$null)
        $diffStat = (git -C $run.repoPath --no-pager diff --shortstat "$($run.baseCommit)..$ref" 2>$null) -join ' '
    }

    $notesTailText = $null
    if ($runDir) {
        $np = Join-Path $runDir 'notes.md'
        if (Test-Path -LiteralPath $np) {
            $notesTailText = (Get-Content -LiteralPath $np -Tail $NotesTail -ErrorAction SilentlyContinue) -join "`n"
        }
    }

    $elapsed = $null
    try {
        $end = if ($run.PSObject.Properties['endedAt'] -and $run.endedAt) { [datetime]::Parse($run.endedAt) } else { Get-Date }
        $elapsed = '{0:h\hm\m}' -f ($end - [datetime]::Parse($run.startedAt))
    }
    catch { }

    $vaultNote = $null
    if ($run.PSObject.Properties['vaultNote'] -and $run.vaultNote) { $vaultNote = $run.vaultNote }
    else {
        $guess = Join-Path (Get-LightsOutVaultFolder -Run $run) 'summary.md'
        if (Test-Path -LiteralPath $guess) { $vaultNote = $guess }
    }

    # A run the registry thinks is live, whose worker process is gone, died without finalizing
    # (reboot, forced kill, power loss). Say so rather than reporting it as still working.
    $effectiveStatus = $run.status
    if ($run.status -in @('running', 'launching', 'finalizing') -and -not $alive) {
        $effectiveStatus = 'orphaned'
    }

    [pscustomobject]@{
        id                   = $run.id
        status               = $effectiveStatus
        recordedStatus       = $run.status
        workerAlive          = $alive
        workerPid            = if ($run.PSObject.Properties['workerPid']) { $run.workerPid } else { $null }
        mode                 = $run.mode
        agent                = $run.agent
        repoPath             = $run.repoPath
        branch               = $run.branch
        branchExists         = $branchExists
        startedAt            = $run.startedAt
        endedAt              = if ($run.PSObject.Properties['endedAt']) { $run.endedAt } else { $null }
        elapsed              = $elapsed
        gnhfExitCode         = if ($run.PSObject.Properties['gnhfExitCode']) { $run.gnhfExitCode } else { $null }
        commitCount          = $commits.Count
        commits              = $commits
        diffStat             = $diffStat
        stopWhen             = if ($run.PSObject.Properties['stopWhen']) { $run.stopWhen } else { $null }
        endState             = $endState
        verifyCommand        = if ($run.PSObject.Properties['verifyCommand']) { $run.verifyCommand } else { $null }
        verifyExitCodeBefore = if ($run.PSObject.Properties['verifyExitCodeBefore']) { $run.verifyExitCodeBefore } else { $null }
        verifyExitCodeAfter  = if ($run.PSObject.Properties['verifyExitCodeAfter']) { $run.verifyExitCodeAfter } else { $null }
        runDir               = $runDir
        gnhfKind             = if ($run.PSObject.Properties['gnhfKind']) { $run.gnhfKind } else { $null }
        gnhfVersion          = if ($run.PSObject.Properties['gnhfVersion']) { $run.gnhfVersion } else { $null }
        vaultNote            = $vaultNote
        notesTail            = $notesTailText
        prompt               = $run.prompt
    }
}

if ($Json) {
    $arr = @($results)
    # NOTE: do not name this $json -- PowerShell variables are case-insensitive, so it would
    # assign a string to the [switch]$Json parameter and throw at the call site.
    $jsonText = $arr | ConvertTo-Json -Depth 10
    if ($arr.Count -eq 1) { "[$jsonText]" } else { $jsonText }
    return
}

foreach ($r in $results) {
    Write-Host ''
    Write-Host "=== $($r.id) ===" -ForegroundColor Cyan
    Write-Host "  status       : $($r.status)$(if ($r.status -eq 'orphaned') { '  <- worker died without finalizing' })"
    Write-Host "  repo/branch  : $($r.repoPath)  [$($r.branch)$(if (-not $r.branchExists) { ' MISSING' })]"
    Write-Host "  agent/mode   : $($r.agent) / $($r.mode)"
    Write-Host "  started      : $($r.startedAt)   elapsed: $($r.elapsed)"
    Write-Host "  commits      : $($r.commitCount)   $($r.diffStat)"
    if ($r.stopWhen) { Write-Host "  stop-when    : $($r.stopWhen)" }
    if ($r.endState) { Write-Host "  end-state    : $($r.endState.status) (iterations=$($r.endState.iterations))" }
    if ($r.verifyCommand) { Write-Host "  verify       : '$($r.verifyCommand)' before=$($r.verifyExitCodeBefore) after=$($r.verifyExitCodeAfter)" }
    if ($r.vaultNote) { Write-Host "  vault note   : $($r.vaultNote)" }
    if ($r.runDir) { Write-Host "  run dir      : $($r.runDir)" }
    if ($r.notesTail) {
        Write-Host "  --- notes tail ---"
        $r.notesTail -split "`n" | ForEach-Object { Write-Host "  $_" }
    }
}
Write-Host ''