# Auto-sync hang ngay - chay tu Task Scheduler.
# Sync hom qua + hom nay tu Hikvision -> DB.
# Retry tu dong neu device offline (thiet bi co the dang reboot).
# Log: logs\auto_sync.log

$ErrorActionPreference = 'Continue'
$logDir  = Join-Path $PSScriptRoot 'logs'
$logFile = Join-Path $logDir 'auto_sync.log'
if (-not (Test-Path $logDir)) { New-Item -ItemType Directory -Path $logDir | Out-Null }

function Log($msg) {
    $line = "[$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss')] $msg"
    Add-Content -Path $logFile -Value $line -Encoding UTF8
}

function Invoke-SyncRange($from, $to) {
    Log ""
    Log "=== AUTO SYNC start ($from -> $to) ==="

    # Goi POST /api/sync
    try {
        $body = "{`"from`":`"$from`",`"to`":`"$to`"}"
        $r = Invoke-RestMethod -Uri 'http://127.0.0.1:5000/api/sync' `
            -Method POST -ContentType 'application/json' -Body $body -TimeoutSec 30
        Log "Sync started: $($r | ConvertTo-Json -Compress)"
    } catch {
        $code = $null
        if ($_.Exception.Response) { $code = $_.Exception.Response.StatusCode.value__ }
        Log "ERROR starting sync (HTTP $code): $($_.Exception.Message)"
        return $null
    }

    # Poll status toi da 5 phut
    $timeout = 300; $elapsed = 0
    do {
        Start-Sleep -Seconds 5; $elapsed += 5
        try {
            $st = Invoke-RestMethod -Uri 'http://127.0.0.1:5000/api/sync/status' -TimeoutSec 10
        } catch {
            Log "ERROR polling status: $($_.Exception.Message)"
            return $null
        }
        if (-not $st.running) {
            $res = $st.result
            if ($res -and $res.message) {
                Log ("DONE: total={0} new={1} sessions={2} posts={3} msg='{4}'" -f `
                    $res.total, $res.new, $res.sessions, $res.posts, $res.message)
            } elseif ($res -and $res.error) {
                Log "DONE with error: $($res.error)"
            } else {
                Log "DONE (no result detail)"
            }
            Log "=== AUTO SYNC end (took $elapsed seconds) ==="
            return $res
        }
    } while ($elapsed -lt $timeout)

    Log "TIMEOUT after $timeout seconds - server van running"
    Log "=== AUTO SYNC end (TIMEOUT) ==="
    return $null
}

function Test-DeviceOffline($res) {
    if ($res -eq $null) { return $true }
    $msg = [string]($res.message)
    return ($msg -like "*Pre-sync check failed*") -or ($msg -like "*Connection error*") -or ($msg -like "*timed out*")
}

# === MAIN ===
$today     = Get-Date -Format 'yyyy-MM-dd'
$yesterday = (Get-Date).AddDays(-1).ToString('yyyy-MM-dd')

# Sync hom qua + hom nay (catch-up neu toi qua device offline)
$result = Invoke-SyncRange $yesterday $today

# Neu device offline: cho 20 phut roi thu lai
# (Hikvision co the dang tu khoi dong lai - thuong mat 5-10 phut)
if (Test-DeviceOffline $result) {
    Log "RETRY: Device khong phan hoi. Cho 20 phut roi thu lai..."
    Start-Sleep -Seconds 1200
    $result2 = Invoke-SyncRange $yesterday $today
    if (Test-DeviceOffline $result2) {
        Log "RETRY FAILED: Device van khong phan hoi sau 20 phut. Can kiem tra thu cong."
        exit 3
    }
}

exit 0