#!/bin/bash

# File path for output
OUTPUT_FILE="/tmp/db_version_info.tmp"
PDB_LIST_FILE="/tmp/pdb_list.tmp"
> "$OUTPUT_FILE" # Clear the output file before starting
touch $OUTPUT_FILE
chown oracle $OUTPUT_FILE

# Function to get the Oracle Database version
get_oracle_version() {
    su - oracle -s /bin/bash -c "
        sqlplus -s / as sysdba <<'EOF' >> \"$OUTPUT_FILE\"
        whenever sqlerror exit sql.sqlcode;
        SET ECHO ON
        SET HEADING ON
        SET UNDERLINE '='
        SET FEEDBACK OFF
        SET LINESIZE 150
        SET PAGESIZE 100
        COLUMN BANNER FORMAT A80

        PROMPT Oracle Database Version:;
        SELECT banner FROM v\$version WHERE banner LIKE 'Oracle%' AND ROWNUM = 1;

        exit;
EOF
    "
}


# Function to get APEX and ORDS versions within a specific container
get_apex_ords_versions() {
    local container_name="$1"
    su - oracle -s /bin/bash -c "
        sqlplus -s / as sysdba <<EOF >> \"$OUTPUT_FILE\"
        whenever sqlerror exit sql.sqlcode;
        set echo off
        set heading on
        SET UNDERLINE '='
        set feedback off
        set linesize 150

        -- Switch to the specified container
        ALTER SESSION SET CONTAINER = $container_name;

        -- Print the container name for clarity
        PROMPT Version information for container: $container_name;

        -- APEX version
        PROMPT APEX Version:;
        SELECT version_no AS version FROM apex_release;

        -- ORDS version
        PROMPT ORDS Version:;
        SELECT 'ORDS is ' || version AS \"Version of ORDS\"
          FROM ords_metadata.ords_schema_version;

        exit;
EOF
    "
}

# Run the Oracle version query
echo "Gathering Oracle Database version..." >> "$OUTPUT_FILE"
get_oracle_version

# Get a list of all PDBs, excluding PDB$SEED, and write to a temporary file
su - oracle -s /bin/bash -c "
    sqlplus -s / as sysdba <<'EOF'
    set heading off
    set feedback off
    set pagesize 0
    spool $PDB_LIST_FILE
    SELECT NAME FROM v\$pdbs WHERE NAME NOT IN ('PDB\$SEED');
    spool off
    exit;
EOF
"

# Verify that the PDB_LIST_FILE was created and contains data
if [[ -f "$PDB_LIST_FILE" && -s "$PDB_LIST_FILE" ]]; then
    # Read each valid PDB name from the temporary file
    while IFS= read -r PDB; do
        PDB=$(echo "$PDB" | xargs)  # Trim any leading/trailing whitespace
        if [[ -n "$PDB" ]]; then
            echo "Gathering APEX and ORDS versions for PDB: $PDB..." >> "$OUTPUT_FILE"
            get_apex_ords_versions "$PDB"
        fi
    done < "$PDB_LIST_FILE"
else
    echo "No PDBs found or could not access v\$pdbs view" >> "$OUTPUT_FILE"
fi

cat "$OUTPUT_FILE"
# Clean up the temporary file
rm -f "$PDB_LIST_FILE"