<#
.SYNOPSIS
    Velocity-Analyse ueber 12 Monate fuer alle pathOS Teams
#>

$JiraUrl = "https://arija.jaas.service.deutschebahn.com"
$ApiBase = "$JiraUrl/rest"
$OutputDir = "project-audit\data\jira-velocity"

$TeamProjects = @(
    @{ key = "O2C404"; name = "Team 404" }
    @{ key = "O2CCIB"; name = "Team CIB" }
    @{ key = "O2CZERO"; name = "Team Zero" }
    @{ key = "O2COS"; name = "OPs Squad" }
    @{ key = "O2CDEVOPS"; name = "DevOps" }
)

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

Write-Host "============================================================"
Write-Host "  pathOS Velocity-Analyse (12 Monate)"
Write-Host "============================================================"

$Token = Read-Host "Jira PAT"
$Headers = @{ "Authorization" = "Bearer $Token"; "Content-Type" = "application/json" }

New-Item -ItemType Directory -Path $OutputDir -Force | Out-Null

function Invoke-JiraApi($Uri) {
    try {
        $R = Invoke-WebRequest -Uri $Uri -Headers $Headers -UseBasicParsing -ErrorAction Stop
        return ($R.Content | ConvertFrom-Json)
    } catch { return $null }
}

$AllResults = @()

foreach ($Team in $TeamProjects) {
    $Key = $Team.key
    $Name = $Team.name
    Write-Host ""
    Write-Host ">> $Name ($Key)" -ForegroundColor Yellow

    # Alle resolved/done Issues der letzten 12 Monate
    $Jql = "project = $Key AND status in (Fertig, Done, Closed, Resolved) AND resolved >= -365d ORDER BY resolved ASC"
    $Issues = @()
    $Start = 0
    do {
        $Uri = "$ApiBase/api/2/search?jql=$([Uri]::EscapeDataString($Jql))&startAt=$Start&maxResults=100&fields=summary,status,issuetype,resolutiondate,created"
        $Result = Invoke-JiraApi $Uri
        if ($null -eq $Result) { break }
        $Issues += $Result.issues
        $Start += 100
        Write-Host "  $($Issues.Count) / $($Result.total)..." -NoNewline
    } while ($Issues.Count -lt $Result.total -and $Issues.Count -lt 3000)
    Write-Host ""
    Write-Host "  $($Issues.Count) resolved Issues (12 Monate)" -ForegroundColor Green

    # Nach Monat gruppieren
    $ByMonth = @{}
    $BugsByMonth = @{}
    $EnablerByMonth = @{}
    foreach ($I in $Issues) {
        $ResDate = $I.fields.resolutiondate
        if (-not $ResDate) { $ResDate = $I.fields.created }
        if ($ResDate) {
            try {
                $Date = [DateTime]::Parse($ResDate)
                $MK = $Date.ToString("yyyy-MM")
                $ByMonth[$MK] = ($ByMonth[$MK]) + 1
                $Type = $I.fields.issuetype.name
                if ($Type -eq "Bug" -or $Type -eq "Fehler") { $BugsByMonth[$MK] = ($BugsByMonth[$MK]) + 1 }
                if ($Type -eq "Enabler") { $EnablerByMonth[$MK] = ($EnablerByMonth[$MK]) + 1 }
            } catch {}
        }
    }

    # Ergebnis sammeln
    foreach ($MK in ($ByMonth.Keys | Sort-Object)) {
        $Total = $ByMonth[$MK]
        $Bugs = if ($BugsByMonth[$MK]) { $BugsByMonth[$MK] } else { 0 }
        $Enablers = if ($EnablerByMonth[$MK]) { $EnablerByMonth[$MK] } else { 0 }
        $AllResults += [PSCustomObject]@{
            Team = $Name
            Key = $Key
            Month = $MK
            Total = $Total
            Bugs = $Bugs
            Enabler = $Enablers
            BugRate = if ($Total -gt 0) { [Math]::Round(($Bugs / $Total) * 100, 0) } else { 0 }
        }
    }
}

# CSV speichern
$AllResults | Export-Csv "$OutputDir\velocity-12m.csv" -Delimiter ";" -Encoding UTF8 -NoTypeInformation

# Markdown
$Md = @()
$Md += "# Velocity-Analyse pathOS (12 Monate)"
$Md += ""
$Md += "> Exportiert: $(Get-Date -Format 'yyyy-MM-dd HH:mm')"
$Md += ""
$Md += "| Team | Monat | Gesamt | Bugs | Enabler | Bug% |"
$Md += "|------|-------|--------|------|---------|------|"
foreach ($R in $AllResults) {
    $Md += "| $($R.Team) | $($R.Month) | $($R.Total) | $($R.Bugs) | $($R.Enabler) | $($R.BugRate)% |"
}
$Md -join "`n" | Out-File "$OutputDir\velocity-12m.md" -Encoding UTF8

# Zusammenfassung pro Team
Write-Host ""
Write-Host "=== Zusammenfassung ==="
foreach ($Team in $TeamProjects) {
    $TeamData = $AllResults | Where-Object { $_.Key -eq $Team.key }
    $TotalAll = ($TeamData | Measure-Object -Property Total -Sum).Sum
    $TotalBugs = ($TeamData | Measure-Object -Property Bugs -Sum).Sum
    $AvgMonth = if ($TeamData.Count -gt 0) { [Math]::Round($TotalAll / $TeamData.Count, 0) } else { 0 }
    Write-Host "  $($Team.name): $TotalAll Issues (12M), Avg $AvgMonth/Monat, $TotalBugs Bugs ($([Math]::Round($TotalBugs/$TotalAll*100,0))%)"
}

Write-Host ""
Write-Host "============================================================" -ForegroundColor Green
Write-Host "  FERTIG! Ergebnisse in $OutputDir" -ForegroundColor Green
Write-Host "============================================================" -ForegroundColor Green