# RMAN Restore Database FROM ZERO - Clean State (PowerShell)
# Backups are on F:\ (NFS mount from Proxmox host)
# Run as: Administrator
# Location: D:\oracle\scripts\rman_restore_from_zero.ps1
#
# Parameters:
#   -TestMode: Skip service reconfiguration and Listener startup (for weekly DR tests)

param(
    [switch]$TestMode
)

$ErrorActionPreference = "Continue"

$env:ORACLE_HOME = "C:\Users\Administrator\Downloads\WINDOWS.X64_193000_db_home"
$env:ORACLE_SID = "ROA"
$env:PATH = "$env:ORACLE_HOME\bin;$env:PATH"

Write-Host "============================================"
Write-Host "RMAN Database Restore FROM ZERO"
Write-Host "============================================"
Write-Host ""
Write-Host "Database:    ROA"
Write-Host "DBID:        1363569330"
Write-Host "Backups:     F:\ROA\autobackup (NFS mount from Proxmox)"
Write-Host ""
Write-Host "This script will:"
Write-Host "  1. CLEANUP: Delete any existing database files"
Write-Host "  2. RESTORE: Restore from F:\ backups"
Write-Host "  3. VERIFY: Check database is working"
Write-Host ""

# Verify F:\ mount is accessible
if (-not (Test-Path "F:\ROA\autobackup")) {
    Write-Host "ERROR: F:\ROA\autobackup not accessible!" -ForegroundColor Red
    Write-Host ""
    Write-Host "Please verify:"
    Write-Host "  1. F:\ drive is mounted: dir F:\"
    Write-Host "  2. NFS mount command: mount -o rw,nolock,mtype=hard,timeout=60 10.0.20.202:/mnt/pve/oracle-backups F:"
    Write-Host "  3. Proxmox host is reachable: ping 10.0.20.202"
    Write-Host ""
    exit 1
}

Write-Host "[OK] F:\ROA\autobackup is accessible"
Write-Host ""

# Create directories with proper permissions
try {
    New-Item -ItemType Directory -Path "D:\oracle\temp" -Force -ErrorAction Stop | Out-Null
    New-Item -ItemType Directory -Path "D:\oracle\logs" -Force -ErrorAction Stop | Out-Null
    Write-Host "[OK] Created required directories"
} catch {
    Write-Host "ERROR: Failed to create directories: $_" -ForegroundColor Red
    exit 1
}

Write-Host "============================================"
Write-Host "STEP 1: CLEANUP - Delete existing database"
Write-Host "============================================"
Write-Host ""
Write-Host "Calling cleanup_database.ps1..."
Write-Host ""

# Call cleanup script with /SILENT flag
& "D:\oracle\scripts\cleanup_database.ps1" /SILENT
if ($LASTEXITCODE -ne 0) {
    Write-Host ""
    Write-Host "ERROR: Cleanup failed!" -ForegroundColor Red
    exit 1
}

Write-Host ""
Write-Host "[OK] Cleanup complete - VM is in clean state"
Write-Host ""
Write-Host "Starting restore in 2 seconds..."
Start-Sleep -Seconds 2

Write-Host "============================================"
Write-Host "STEP 2: RESTORE - Restore from F:\ backups"
Write-Host "============================================"
Write-Host ""

# Step 2.1: Check Oracle service (create only if missing)
Write-Host "[2.1] Checking Oracle service..."
$service = Get-Service -Name "OracleServiceROA" -ErrorAction SilentlyContinue

if ($service) {
    Write-Host "[OK] Oracle service already exists, skipping creation (15s saved!)" -ForegroundColor Green
    Write-Host "    Service will be reused for this restore"
    
    # Ensure service is running (required for SQL*Plus connection)
    if ($service.Status -ne "Running") {
        Write-Host "    Service is stopped, starting it (may take 30-60 seconds)..."
        
        # Start service in background job to avoid blocking
        $startJob = Start-Job -ScriptBlock {
            Start-Service -Name "OracleServiceROA" -ErrorAction SilentlyContinue
        }
        
        # Poll for service status with timeout
        $maxWait = 60
        $elapsed = 0
        $pollInterval = 3
        $serviceStarted = $false
        
        while ($elapsed -lt $maxWait) {
            Start-Sleep -Seconds $pollInterval
            $elapsed += $pollInterval
            
            # Refresh service status
            $currentService = Get-Service -Name "OracleServiceROA" -ErrorAction SilentlyContinue
            if ($currentService -and $currentService.Status -eq "Running") {
                $serviceStarted = $true
                Write-Host "    [OK] Service started successfully after $elapsed seconds"
                break
            }
            
            if ($elapsed % 15 -eq 0) {
                Write-Host "    Still waiting for service to start... ($elapsed/$maxWait seconds)"
            }
        }
        
        # Cleanup background job
        Stop-Job -Job $startJob -ErrorAction SilentlyContinue
        Remove-Job -Job $startJob -ErrorAction SilentlyContinue
        
        if (-not $serviceStarted) {
            Write-Host "    WARNING: Service did not start within $maxWait seconds" -ForegroundColor Yellow
            Write-Host "    This may cause SQL*Plus connection issues (ORA-12560)"
            Write-Host "    Attempting to continue anyway..."
        }
    } else {
        Write-Host "    Service is already running"
    }
} else {
    Write-Host "    Oracle service not found, creating from PFILE..."
    
    # Check if PFILE exists, create if missing
    $pfilePath = "C:\Users\oracle\admin\ROA\pfile\initROA.ora"
    if (-not (Test-Path $pfilePath)) {
        Write-Host "    PFILE not found, creating default initROA.ora..." -ForegroundColor Yellow
        
        # Create directory if needed
        $pfileDir = Split-Path $pfilePath -Parent
        if (-not (Test-Path $pfileDir)) {
            New-Item -ItemType Directory -Path $pfileDir -Force | Out-Null
        }
        
        # Create PFILE with tested configuration
        $pfileContent = @"
# Initialization Parameters for ROA Database - DR VM
# Auto-generated by rman_restore_from_zero.ps1 - $(Get-Date -Format 'yyyy-MM-dd HH:mm:ss')

# Database Identification
db_name=ROA
db_unique_name=ROA

# Memory Configuration
memory_target=1024M
memory_max_target=1024M

# File Locations
control_files=('C:\Users\oracle\oradata\ROA\control01.ctl', 'C:\Users\oracle\recovery_area\ROA\control02.ctl')
db_recovery_file_dest='C:\Users\oracle\recovery_area'
db_recovery_file_dest_size=50G
audit_file_dest='C:\Users\oracle\admin\ROA\adump'

# Redo and Archive Log
log_archive_format=%t_%s_%r.dbf

# Compatibility
compatible=19.0.0

# Character Set
nls_language=AMERICAN
nls_territory=AMERICA

# Processes and Sessions
processes=300
sessions=472

# Miscellaneous
diagnostic_dest='C:\Users\oracle'
_allow_resetlogs_corruption=TRUE 
"@
        
        try {
            $pfileContent | Out-File -FilePath $pfilePath -Encoding ASCII -ErrorAction Stop
            Write-Host "    [OK] Created PFILE: $pfilePath" -ForegroundColor Green
        } catch {
            Write-Host "ERROR: Failed to create PFILE: $_" -ForegroundColor Red
            exit 1
        }
    }
    
    & oradim -new -sid ROA -startmode auto -pfile $pfilePath 2>&1 | Out-Null
    if ($LASTEXITCODE -ne 0) {
        Write-Host "ERROR: Failed to create Oracle service" -ForegroundColor Red
        exit 1
    }
    Write-Host "[OK] Oracle service created successfully (AUTOMATIC startup)"
    Start-Sleep -Seconds 2
}

# Step 2.2: Startup NOMOUNT
Write-Host "[2.2] Starting database in NOMOUNT mode..."

# First, ensure any partially started instance is shut down
# (Service auto-start may have started instance in error state without control files)
Write-Host "    Ensuring clean state - shutting down any existing instance..."
$cleanupSQL = @"
WHENEVER SQLERROR CONTINUE
SHUTDOWN ABORT;
EXIT;
"@
$cleanupSQL | & sqlplus -S / as sysdba 2>&1 | Out-Null

# Now start cleanly in NOMOUNT
Write-Host "    Starting fresh instance in NOMOUNT mode..."
$nomountSQL = @"
STARTUP NOMOUNT PFILE='C:\Users\oracle\admin\ROA\pfile\initROA.ora';
EXIT;
"@

$nomountSQL | & sqlplus -S / as sysdba 2>&1 | Out-Null
if ($LASTEXITCODE -ne 0) {
    Write-Host "ERROR: Failed to startup NOMOUNT" -ForegroundColor Red
    exit 1
}
Write-Host "[OK] Database started in NOMOUNT mode"
Start-Sleep -Seconds 3

# Step 2.3: Copy backups and create RMAN script
Write-Host "[2.3] Preparing RMAN restore..."
$rmanScript = "D:\oracle\temp\restore_from_zero.rman"
$logFile = "D:\oracle\logs\restore_from_zero.log"

# Copy backups from F:\ to recovery area (mode-dependent)
New-Item -ItemType Directory -Path "C:\Users\oracle\recovery_area\ROA\autobackup" -Force | Out-Null

if ($TestMode) {
    Write-Host "[INFO] Copying selected backups from F:\ROA\autobackup to recovery area..."
    Write-Host "       TEST MODE: Only latest backup set (faster for weekly tests)"
} else {
    Write-Host "[INFO] Copying all backups from F:\ROA\autobackup to recovery area..."
    Write-Host "       STANDALONE MODE: All backups for maximum DR safety"
}

# Select backup files based on mode (TestMode vs Standalone)
try {
    if ($TestMode) {
        # TEST MODE: Copy latest L0 backup set + all incrementals/archives
        Write-Host "[INFO] TEST MODE: Selecting latest backup set using naming convention..." -ForegroundColor Cyan
        
        # Check if new naming convention is in use (L0_*, L1_*, etc.)
        $l0Backups = Get-ChildItem "F:\ROA\autobackup\L0_*.BKP" -ErrorAction Continue | 
            Sort-Object LastWriteTime -Descending
        
        if ($l0Backups.Count -gt 0) {
            # New naming convention detected - use smart selection
            Write-Host "[INFO] Using naming convention for optimized backup selection" -ForegroundColor Cyan
            
            $latestL0 = $l0Backups[0]
            # Extract date from filename: L0_ROA_20251011_123_1.BKP -> 20251011
            if ($latestL0.Name -match 'L0_\w+_(\d{8})_') {
                $backupDate = $Matches[1]
                Write-Host "[INFO] Latest Level 0 backup date: $backupDate" -ForegroundColor Cyan
                Write-Host "       Base file: $($latestL0.Name)" -ForegroundColor Cyan
                
                # Select all files from this backup set:
                # - All L0_*_<date>_* (all pieces of Level 0)
                # - All L1_*_<date>_* or later (incrementals from same day or after)
                # - All ARC_*_<date>_* or later (archive logs)
                # - All SPFILE_* and CF_* (needed for restore)
                
                $backupFiles = Get-ChildItem "F:\ROA\autobackup\*.BKP" -ErrorAction Continue | 
                    Where-Object {
                        $_.Name -match "^L0_\w+_${backupDate}_" -or      # Level 0 pieces
                        $_.Name -match "^L1_\w+_\d{8}_" -or              # All Level 1 incrementals
                        $_.Name -match "^ARC_\w+_\d{8}_" -or             # All archive logs
                        $_.Name -match "^SPFILE_\w+_${backupDate}_" -or  # SPFILE from same day
                        $_.Name -match "^CF_\w+_${backupDate}_" -or      # Controlfile from same day
                        $_.Name -match "^O1_MF_S_"                       # Autobackup control files (always needed)
                    }
                
                Write-Host "[INFO] Selected $($backupFiles.Count) files for restore:" -ForegroundColor Cyan
                Write-Host "       - Level 0 pieces for date $backupDate" -ForegroundColor Cyan
                Write-Host "       - All Level 1 incrementals" -ForegroundColor Cyan
                Write-Host "       - All archive logs" -ForegroundColor Cyan
                Write-Host "       - SPFILE and Control file backups" -ForegroundColor Cyan
                
            } else {
                Write-Host "WARNING: Cannot parse date from L0 filename, using ALL L0/L1/ARC files" -ForegroundColor Yellow
                $backupFiles = Get-ChildItem "F:\ROA\autobackup\*.BKP" -ErrorAction Continue | 
                    Where-Object { $_.Name -match "^(L0_|L1_|ARC_|SPFILE_|CF_)" }
            }
            
        } else {
            # Old naming convention (autobackup format) - fallback to copying all
            Write-Host "[INFO] Old naming convention detected - copying ALL backups for safety" -ForegroundColor Yellow
            Write-Host "       (New naming convention will be used after next backup runs)" -ForegroundColor Yellow
            $backupFiles = Get-ChildItem "F:\ROA\autobackup\*.BKP" -ErrorAction Continue
        }
        
        Write-Host "[INFO] Total files selected: $($backupFiles.Count)" -ForegroundColor Cyan
        
    } else {
        # STANDALONE MODE: Copy ALL backups (disaster recovery - maximum safety with fallback)
        Write-Host "[INFO] STANDALONE MODE: Copying ALL backups for maximum DR safety..." -ForegroundColor Yellow
        $backupFiles = Get-ChildItem "F:\ROA\autobackup\*.BKP" -ErrorAction Continue
        Write-Host "[INFO] Full DR restore - will copy all available backups (includes redundancy)" -ForegroundColor Yellow
    }
} catch {
    Write-Host "WARNING: Cannot enumerate backup files on F: drive - $_" -ForegroundColor Yellow
    $backupFiles = @()
}

# Validate backup count
$minRequired = 2
if ($backupFiles.Count -lt $minRequired) {
    Write-Host "ERROR: Insufficient backup files found on F: drive (found: $($backupFiles.Count))" -ForegroundColor Red
    Write-Host "        At least $minRequired backup files required for successful restore"
    Write-Host "        Checking F:\ROA\autobackup directory..."
    try {
        $dirCheck = Get-ChildItem "F:\ROA\autobackup" -ErrorAction Continue
        Write-Host "        Directory contents: $($dirCheck.Count) files"
        foreach ($file in $dirCheck) {
            Write-Host "          $($file.Name) - $([math]::Round($file.Length / 1GB, 2)) GB" -ForegroundColor Gray
        }
    } catch {
        Write-Host "        Cannot access directory: $_" -ForegroundColor Red
    }
    exit 1
}

Write-Host "[INFO] Found $($backupFiles.Count) backup files, total size: $([math]::Round(($backupFiles | Measure-Object -Property Length -Sum).Sum / 1GB, 2)) GB"

# Copy backups with better error handling
Write-Host "[INFO] Starting backup copy operation..."
$copyErrors = @()
foreach ($backupFile in $backupFiles) {
    try {
        Write-Host "[INFO] Copying $($backupFile.Name)..."
        Copy-Item $backupFile.FullName "C:\Users\oracle\recovery_area\ROA\autobackup\" -Force -ErrorAction Stop
        Write-Host "[OK] Copied $($backupFile.Name)" -ForegroundColor Green
    } catch {
        Write-Host "ERROR: Failed to copy $($backupFile.Name) - $_" -ForegroundColor Red
        $copyErrors += "$($backupFile.Name): $_"
    }
}

if ($copyErrors.Count -gt 0) {
    Write-Host "ERROR: Backup copy failed for $($copyErrors.Count) files" -ForegroundColor Red
    foreach ($error in $copyErrors) {
        Write-Host "   $error" -ForegroundColor Red
    }
    exit 1
}

# Verify copied backups
try {
    $copiedFiles = Get-ChildItem "C:\Users\oracle\recovery_area\ROA\autobackup\*.BKP" -ErrorAction Continue
} catch {
    Write-Host "ERROR: Cannot verify copied backups - $_" -ForegroundColor Red
    exit 1
}

if ($copiedFiles.Count -ne $backupFiles.Count) {
    Write-Host "ERROR: Backup copy verification failed - file count mismatch" -ForegroundColor Red
    Write-Host "       Expected: $($backupFiles.Count), Copied: $($copiedFiles.Count)"
    exit 1
}

Write-Host "[OK] All $($copiedFiles.Count) backups copied and verified to recovery area"

# Create RMAN script
$rmanContent = @"
SET DBID 1363569330;

RUN {
    ALLOCATE CHANNEL ch1 DEVICE TYPE DISK;
    RESTORE CONTROLFILE FROM AUTOBACKUP;
    RELEASE CHANNEL ch1;
}

ALTER DATABASE MOUNT;

CATALOG START WITH 'C:/USERS/ORACLE/RECOVERY_AREA/ROA/AUTOBACKUP' NOPROMPT;

CROSSCHECK BACKUP;
DELETE NOPROMPT EXPIRED BACKUP;

RUN {
    ALLOCATE CHANNEL ch1 DEVICE TYPE DISK;
    ALLOCATE CHANNEL ch2 DEVICE TYPE DISK;
    RESTORE DATABASE;
    RELEASE CHANNEL ch1;
    RELEASE CHANNEL ch2;
}

RUN {
    ALLOCATE CHANNEL ch1 DEVICE TYPE DISK;
    RECOVER DATABASE NOREDO;
    RELEASE CHANNEL ch1;
}

ALTER DATABASE OPEN RESETLOGS;

DELETE NOPROMPT OBSOLETE;

EXIT;
"@

$rmanContent | Out-File -FilePath $rmanScript -Encoding ASCII
Write-Host "[OK] RMAN script created: $rmanScript"

# Step 2.4: Run RMAN restore
Write-Host "[2.4] Running RMAN restore (this will take 10-20 minutes)..."
Write-Host "       Log file: $logFile"
Write-Host ""

& rman target / cmdfile=$rmanScript log=$logFile

if ($LASTEXITCODE -ne 0) {
    Write-Host ""
    Write-Host "ERROR: RMAN restore failed!" -ForegroundColor Red
    Write-Host "Check log: $logFile"
    exit 1
}

Write-Host ""
Write-Host "[OK] RMAN restore completed successfully!"
Write-Host ""

Write-Host "============================================"
Write-Host "STEP 3: VERIFY - Check database status"
Write-Host "============================================"
Write-Host ""
Write-Host "[3.1] Verifying database..."

$verifySQL = @"
SET PAGESIZE 100 LINESIZE 200
COLUMN info FORMAT A80
SELECT 'DB_NAME: ' || NAME || ', OPEN_MODE: ' || OPEN_MODE AS info FROM V`$DATABASE;
SELECT 'INSTANCE: ' || INSTANCE_NAME || ', STATUS: ' || STATUS AS info FROM V`$INSTANCE;
SELECT 'TABLESPACES: ' || COUNT(*) AS info FROM DBA_TABLESPACES;
SELECT 'DATAFILES: ' || COUNT(*) AS info FROM DBA_DATA_FILES;
SELECT 'TABLES: ' || COUNT(*) AS info FROM DBA_TABLES WHERE OWNER NOT IN ('SYS','SYSTEM');
EXIT;
"@

$verifySQL | & sqlplus -S / as sysdba

Write-Host ""
Write-Host "[3.2] Creating SPFILE for database persistence..."
$spfileSQL = @"
CREATE SPFILE FROM PFILE='C:\Users\oracle\admin\ROA\pfile\initROA.ora';
EXIT;
"@

$spfileSQL | & sqlplus -S / as sysdba 2>&1 | Out-Null
if ($LASTEXITCODE -ne 0) {
    Write-Host "WARNING: Failed to create SPFILE - database may not persist after connections close" -ForegroundColor Yellow
} else {
    Write-Host "[OK] SPFILE created successfully"
    
    # Check if running in TestMode (weekly DR test)
    if ($TestMode) {
        Write-Host "[3.3] Running in TEST MODE - skipping service reconfiguration"
        Write-Host "      Database is OPEN and ready for verification"
        Write-Host "      Service will remain configured with PFILE (OK for testing)"
    } else {
        # Full configuration for standalone/production use
        Write-Host "[3.3] Reconfiguring Oracle service to use SPFILE..."
        
        # Shutdown database cleanly
        Write-Host "    Shutting down database temporarily..."
        $shutdownSQL = @"
SHUTDOWN IMMEDIATE;
EXIT;
"@
        $shutdownSQL | & sqlplus -S / as sysdba 2>&1 | Out-Null
        Start-Sleep -Seconds 3
        
        # Delete and recreate service with SPFILE
        Write-Host "    Recreating service with SPFILE..."
        & oradim -delete -sid ROA 2>&1 | Out-Null
        Start-Sleep -Seconds 2
        & oradim -new -sid ROA -startmode auto -spfile 2>&1 | Out-Null
        
        if ($LASTEXITCODE -ne 0) {
            Write-Host "    WARNING: Failed to recreate service with SPFILE" -ForegroundColor Yellow
        } else {
            Write-Host "    [OK] Service now configured with SPFILE and AUTOMATIC startup"
        }
        
        # Restart database
        Write-Host "    Starting database with SPFILE..."
        $startupSQL = @"
STARTUP;
EXIT;
"@
        $startupSQL | & sqlplus -S / as sysdba 2>&1 | Out-Null
        Start-Sleep -Seconds 3
        Write-Host "[OK] Database restarted with SPFILE configuration"

        # Start Oracle Listener
        Write-Host "[3.4] Starting Oracle Listener..."
        
        # Set Listener service to AUTOMATIC and start it
        Set-Service -Name "OracleOraDB19Home1TNSListener" -StartupType Automatic -ErrorAction SilentlyContinue
        Start-Service -Name "OracleOraDB19Home1TNSListener" -ErrorAction SilentlyContinue
        
        if ((Get-Service -Name "OracleOraDB19Home1TNSListener" -ErrorAction SilentlyContinue).Status -eq "Running") {
            Write-Host "[OK] Listener started successfully"
        } else {
            Write-Host "WARNING: Failed to start Listener automatically, trying lsnrctl..." -ForegroundColor Yellow
            & lsnrctl start 2>&1 | Out-Null
        }
        
        Start-Sleep -Seconds 2
        
        # Register database with listener
        $registerSQL = @"
ALTER SYSTEM REGISTER;
EXIT;
"@
        $registerSQL | & sqlplus -S / as sysdba 2>&1 | Out-Null
        Write-Host "[OK] Database registered with Listener"
    }
}

Write-Host ""
Write-Host "============================================"
Write-Host "Database Restore FROM ZERO Complete!"
Write-Host "============================================"
Write-Host ""
Write-Host "Restore log: $logFile"
Write-Host ""
Write-Host "Database is OPEN and ready for testing!" -ForegroundColor Green
Write-Host ""
Write-Host "Next steps:"
Write-Host "  1. Test application connectivity"
Write-Host "  2. Verify data integrity"
Write-Host "  3. Run cleanup_database.ps1 to remove database after test"
Write-Host "  4. Shutdown DR VM to conserve resources"
Write-Host ""

exit 0