#Requires -Version 5.1
<#
.SYNOPSIS
    Displays a summary table of CI job results parsed from JSONL log files.

.DESCRIPTION
    Scans F:\CI\Logs\ (or a custom path) for invoke-ci.jsonl files and
    prints a compact table with job ID, status, total elapsed time, and the
    last error message (if any).

    Each row corresponds to one completed (or failed) CI job.
    Use -JobId to inspect a single job in detail.

.PARAMETER LogDir
    Base directory containing per-job log subdirectories.
    Default: F:\CI\Logs

.PARAMETER Last
    Show only the N most recent jobs (sorted by job-start timestamp).
    Default: 20

.PARAMETER JobId
    When specified, shows a detailed phase-by-phase breakdown for that job.

.PARAMETER Failed
    When specified, filters to failed jobs only.

.EXAMPLE
    # Show last 20 jobs
    .\Get-CIJobSummary.ps1

.EXAMPLE
    # Show last 5 failed jobs
    .\Get-CIJobSummary.ps1 -Last 5 -Failed

.EXAMPLE
    # Detailed breakdown for a specific job
    .\Get-CIJobSummary.ps1 -JobId 'run-12345'
#>
[CmdletBinding()]
param(
    [string] $LogDir = 'F:\CI\Logs',

    [ValidateRange(1, 1000)]
    [int]    $Last   = 20,

    [string] $JobId  = '',

    [switch] $Failed
)

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

# ── Helpers ────────────────────────────────────────────────────────────────────
function Format-SecToHMS {
    param([int] $Seconds)
    if ($Seconds -lt 0) { return '?' }
    $h = [math]::Floor($Seconds / 3600)
    $m = [math]::Floor(($Seconds % 3600) / 60)
    $s = $Seconds % 60
    if ($h -gt 0) { return '{0}h{1:00}m{2:00}s' -f $h, $m, $s }
    return '{0}m{1:00}s' -f $m, $s
}

function Read-JobEvents {
    param([string] $JsonlPath)
    $events = [System.Collections.Generic.List[PSCustomObject]]::new()
    foreach ($line in (Get-Content $JsonlPath -Encoding UTF8 -ErrorAction SilentlyContinue)) {
        $line = $line.Trim()
        if (-not $line) { continue }
        try {
            $events.Add(($line | ConvertFrom-Json))
        } catch {
            Write-Debug "[Get-CIJobSummary] Skipping malformed JSONL line in $JsonlPath"
        }
    }
    return $events
}

# ── Validate log dir ────────────────────────────────────────────────────────
if (-not (Test-Path $LogDir -PathType Container)) {
    Write-Warning "Log directory not found: $LogDir"
    exit 1
}

# ── Single-job detail mode ──────────────────────────────────────────────────
if ($JobId -ne '') {
    $jsonlPath = Join-Path $LogDir (Join-Path $JobId 'invoke-ci.jsonl')
    if (-not (Test-Path $jsonlPath)) {
        Write-Warning "No JSONL log found for job '$JobId' at: $jsonlPath"
        exit 1
    }
    $events = Read-JobEvents -JsonlPath $jsonlPath
    if ($events.Count -eq 0) {
        Write-Warning "JSONL file is empty or unreadable: $jsonlPath"
        exit 1
    }
    Write-Host "`nJob: $JobId"
    Write-Host ('=' * 60)
    Write-Host ('{0,-35} {1,-10} {2}' -f 'Phase', 'Status', 'Timestamp')
    Write-Host ('{0,-35} {1,-10} {2}' -f ('-'*35), ('-'*10), ('-'*24))
    foreach ($ev in $events) {
        $ts = if ($ev.ts) { $ev.ts } else { '' }
        Write-Host ('{0,-35} {1,-10} {2}' -f $ev.phase, $ev.status, $ts)
    }
    # Print error if present
    $failEvent = $events | Where-Object { $_.status -eq 'failure' } | Select-Object -Last 1
    if ($failEvent -and $failEvent.data -and $failEvent.data.error) {
        Write-Host "`nError: $($failEvent.data.error)"
    }
    exit 0
}

# ── Scan all job JSONL files ─────────────────────────────────────────────────
$jsonlFiles = Get-ChildItem -Path $LogDir -Recurse -Filter 'invoke-ci.jsonl' -ErrorAction SilentlyContinue |
    Sort-Object { $_.LastWriteTime } -Descending

if ($jsonlFiles.Count -eq 0) {
    Write-Host "No invoke-ci.jsonl files found under $LogDir"
    exit 0
}

$rows = [System.Collections.Generic.List[PSCustomObject]]::new()

foreach ($file in $jsonlFiles) {
    $events = Read-JobEvents -JsonlPath $file.FullName
    if ($events.Count -eq 0) { continue }

    $jobEvent    = $events | Where-Object { $_.phase -eq 'job' -and $_.status -eq 'start' }  | Select-Object -First 1
    $successEvent= $events | Where-Object { $_.phase -eq 'job' -and $_.status -eq 'success' } | Select-Object -First 1
    $failEvent   = $events | Where-Object { $_.phase -eq 'job' -and $_.status -eq 'failure' } | Select-Object -First 1

    $jId     = if ($events[0].jobId) { $events[0].jobId } else { (Split-Path (Split-Path $file.FullName -Parent) -Leaf) }
    $started = if ($jobEvent -and $jobEvent.ts) { $jobEvent.ts } else { '' }

    if ($successEvent) {
        $status  = 'success'
        $elSec   = if ($successEvent.data -and $null -ne $successEvent.data.elapsedSec) { [int]$successEvent.data.elapsedSec } else { -1 }
        $errMsg  = ''
    } elseif ($failEvent) {
        $status  = 'FAILED'
        $elSec   = if ($failEvent.data -and $null -ne $failEvent.data.elapsedSec) { [int]$failEvent.data.elapsedSec } else { -1 }
        $errMsg  = if ($failEvent.data -and $failEvent.data.error) { "$($failEvent.data.error)" } else { '' }
        # Truncate error for table display
        if ($errMsg.Length -gt 60) { $errMsg = $errMsg.Substring(0, 57) + '...' }
    } else {
        $status  = 'in-progress'
        $elSec   = -1
        $errMsg  = ''
    }

    $rows.Add([PSCustomObject]@{
        JobId   = $jId
        Status  = $status
        Elapsed = Format-SecToHMS -Seconds $elSec
        Started = $started
        Error   = $errMsg
    })
}

# ── Apply filters + limit ────────────────────────────────────────────────────
if ($Failed) {
    $rows = @($rows | Where-Object { $_.Status -eq 'FAILED' })
}

$rows = @($rows | Select-Object -First $Last)

if ($rows.Count -eq 0) {
    Write-Host "No matching jobs found."
    exit 0
}

# ── Print table ──────────────────────────────────────────────────────────────
Write-Host "`nCI Job Summary (last $($rows.Count) jobs):"
Write-Host ('{0,-40} {1,-12} {2,-10} {3,-26} {4}' -f 'JobId', 'Status', 'Elapsed', 'Started', 'Error')
Write-Host ('{0,-40} {1,-12} {2,-10} {3,-26} {4}' -f ('-'*40), ('-'*12), ('-'*10), ('-'*26), ('-'*30))
foreach ($r in $rows) {
    Write-Host ('{0,-40} {1,-12} {2,-10} {3,-26} {4}' -f $r.JobId, $r.Status, $r.Elapsed, $r.Started, $r.Error)
}
Write-Host ''