#Requires -Version 5.1

<#
.SYNOPSIS
    Sterge schema CONTAFIN_ORACLE, pentru reimportul din faza 2.

.DESCRIPTION
    DROP USER CONTAFIN_ORACLE CASCADE. Se foloseste doar in FAZA2.cmd cu
    /reimportcontafin, inainte de a recrea userul (01) si a importa contafin-ul
    real al clientului (03).

    Nu e un pas numerotat pentru ca nu face parte din instalare - e o operatie
    distructiva, apelata explicit.

    Ce se pierde odata cu schema, si trebuie refacut dupa:
      - tabela SERVER_INFO  -> se reface la reluarea pasului 08;
      - joburile UPDATEROA_ZILNIC / UPDATERTVAI_ZILNIC -> tot pasul 08;
      - sinonimele publice catre obiectele ei -> pasul 04.
    FAZA2.cmd le ruleaza pe toate in ordinea corecta.

    Ce NU se pierde: licentele (SYS.AUTH_SERII, SYS.AUTH_DETALII) si restul
    obiectelor SYS traiesc in alta schema.

    Inainte de drop, raporteaza sesiunile deschise ale userului. Daca exista,
    dropul esueaza cu ORA-01940 si scriptul spune exact ce sa faci.

.PARAMETER OracleHome
    Oracle home. Autodetectat daca lipseste.

.PARAMETER ServiceName
    Serviciul bazei. Implicit XEPDB1.

.PARAMETER SystemPassword
    Parola SYS. Implicit romfastsoft.

.PARAMETER KillSessions
    Inchide fortat sesiunile CONTAFIN_ORACLE inainte de drop.

.PARAMETER Force
    Nu cere confirmare. Obligatoriu cand rulezi neinteractiv (FAZA2.cmd il da).

.EXAMPLE
    .\drop-contafin.ps1 -Force

.EXAMPLE
    .\drop-contafin.ps1 -Force -KillSessions
    Cand mai sunt utilizatori conectati si nu ai timp sa ii cauti.

.NOTES
    File Name      : drop-contafin.ps1
    Copyright 2026 : ROMFAST
#>

[CmdletBinding()]
param(
    [Parameter(Mandatory = $false)]
    [string]$OracleHome,

    [Parameter(Mandatory = $false)]
    [string]$ServiceName = "XEPDB1",

    [Parameter(Mandatory = $false)]
    [string]$SystemPassword = "romfastsoft",

    [Parameter(Mandatory = $false)]
    [switch]$KillSessions,

    [Parameter(Mandatory = $false)]
    [switch]$Force
)

$ErrorActionPreference = "Stop"

. (Join-Path $PSScriptRoot "lib\logging-functions.ps1")
. (Join-Path $PSScriptRoot "lib\oracle-functions.ps1")

$configFile = Join-Path $PSScriptRoot "..\config.ps1"
if (Test-Path $configFile) {
    . $configFile
    if (-not $PSBoundParameters.ContainsKey('OracleHome')     -and $Config.OracleHome)     { $OracleHome     = $Config.OracleHome }
    if (-not $PSBoundParameters.ContainsKey('ServiceName')    -and $Config.ServiceName)    { $ServiceName    = $Config.ServiceName }
    if (-not $PSBoundParameters.ContainsKey('SystemPassword') -and $Config.SystemPassword) { $SystemPassword = $Config.SystemPassword }
}

$stamp  = Get-Date -Format 'yyyyMMdd_HHmmss'
$logDir = Join-Path $PSScriptRoot "..\logs"
if (-not (Test-Path $logDir)) { New-Item -ItemType Directory -Path $logDir -Force | Out-Null }
Initialize-LogFile -LogPath (Join-Path $logDir "drop-contafin_$stamp.log") -ScriptName "drop-contafin.ps1"

try {
    Write-LogSection "Stergere CONTAFIN_ORACLE"

    $oraHome = Get-OracleHome -OracleHome $OracleHome
    Write-LogSuccess "Oracle Home: $oraHome"

    if (-not (Test-OracleConnection -OracleHome $oraHome -ServiceName $ServiceName -Password $SystemPassword)) {
        throw "Nu ma pot conecta la baza ($ServiceName)."
    }

    if (-not (Test-OracleUser -OracleHome $oraHome -ServiceName $ServiceName -Password $SystemPassword -SchemaName "CONTAFIN_ORACLE")) {
        Write-LogSuccess "CONTAFIN_ORACLE nu exista. Nimic de sters."
        Close-LogFile
        exit 0
    }

    # Cate obiecte pierdem - util in log, daca ceva merge prost.
    $stare = Invoke-SqlPlus -OracleHome $oraHome -ServiceName $ServiceName `
                -Username "sys" -Password $SystemPassword -AsSysdba -Silent -SqlCommand @"
SET PAGESIZE 0 FEEDBACK OFF HEADING OFF VERIFY OFF
SELECT 'OBIECTE=' || COUNT(*) FROM dba_objects WHERE owner = 'CONTAFIN_ORACLE';
SELECT 'SESIUNI=' || COUNT(*) FROM v`$session WHERE username = 'CONTAFIN_ORACLE';
EXIT
"@

    $obiecte = 0
    $sesiuni = 0
    if ($stare -match 'OBIECTE=(\d+)') { $obiecte = [int]$Matches[1] }
    if ($stare -match 'SESIUNI=(\d+)') { $sesiuni = [int]$Matches[1] }

    Write-Log "Obiecte in schema: $obiecte"
    Write-Log "Sesiuni deschise:  $sesiuni"

    if ($sesiuni -gt 0) {
        if ($KillSessions) {
            Write-LogWarning "Inchid fortat cele $sesiuni sesiuni..."
            $kill = Invoke-SqlPlus -OracleHome $oraHome -ServiceName $ServiceName `
                        -Username "sys" -Password $SystemPassword -AsSysdba -SqlCommand @"
SET SERVEROUTPUT ON FEEDBACK OFF VERIFY OFF
BEGIN
    FOR s IN (SELECT sid, serial# FROM v`$session WHERE username = 'CONTAFIN_ORACLE') LOOP
        BEGIN
            EXECUTE IMMEDIATE 'ALTER SYSTEM KILL SESSION ''' || s.sid || ',' || s.serial# || ''' IMMEDIATE';
            DBMS_OUTPUT.PUT_LINE('  Sesiune inchisa: ' || s.sid);
        EXCEPTION
            WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('  Nu am putut inchide ' || s.sid || ': ' || SQLERRM);
        END;
    END LOOP;
END;
/
EXIT
"@
            Write-LogDebug $kill
        }
        else {
            Write-LogWarning "CONTAFIN_ORACLE are $sesiuni sesiuni deschise. Dropul va esua cu ORA-01940."
            Write-LogWarning "Ori opresti aplicatiile, ori reiei cu -KillSessions."
        }
    }

    if (-not $Force) {
        Write-Host ""
        Write-Host "  Se sterge schema CONTAFIN_ORACLE cu tot cu cele $obiecte obiecte." -ForegroundColor Yellow
        $raspuns = Read-Host "  Scrie DA ca sa continui"
        if ($raspuns -ne "DA") {
            Write-Log "Anulat de utilizator."
            Close-LogFile
            exit 2
        }
    }

    Write-Log "DROP USER CONTAFIN_ORACLE CASCADE ..."

    $rez = Invoke-SqlPlus -OracleHome $oraHome -ServiceName $ServiceName `
                -Username "sys" -Password $SystemPassword -AsSysdba -SqlCommand @"
SET FEEDBACK ON VERIFY OFF
DROP USER CONTAFIN_ORACLE CASCADE;
EXIT
"@

    if ($rez -match 'ORA-01918') {
        Write-LogSuccess "Userul nu exista (ORA-01918). Nimic de facut."
        Close-LogFile
        exit 0
    }

    if ($rez -match 'ORA-01940') {
        Write-LogError "ORA-01940: userul are sesiuni conectate. Reia cu -KillSessions."
        throw "Drop esuat: sesiuni active."
    }

    if ($rez -match 'ORA-(\d{5})') {
        Write-LogError "Drop esuat cu ORA-$($Matches[1])."
        Write-LogDebug $rez
        throw "Drop esuat."
    }

    if (Test-OracleUser -OracleHome $oraHome -ServiceName $ServiceName -Password $SystemPassword -SchemaName "CONTAFIN_ORACLE") {
        throw "Comanda a trecut, dar userul CONTAFIN_ORACLE inca exista."
    }

    Write-LogSuccess "CONTAFIN_ORACLE sters ($obiecte obiecte)"
    Write-Log ""
    Write-Log "Urmeaza, in ordine: 01 (recreare user) -> 03 (import) -> 04 (sinonime) -> 08 (SERVER_INFO, joburi)."

    Close-LogFile
    exit 0
}
catch {
    Write-LogError $_.Exception.Message
    Write-LogDebug $_.ScriptStackTrace
    Close-LogFile
    exit 1
}