#!/bin/bash

# File paths for output
OUTPUT_FILE="/tmp/apex_usage.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 execute the APEX usage query in a specific container
run_query() {
    local container_name="$1"
    su - oracle -s /bin/bash -c "
        sqlplus -s / as sysdba <<EOF >> \"$OUTPUT_FILE\"
        whenever sqlerror exit sql.sqlcode;
        set echo on
        set heading on
        SET UNDERLINE '='
        set feedback off
        set linesize 150

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

        -- Print the container name for clarity
        PROMPT APEX usage for container: $container_name;

        SELECT
            OWNER,
            SUM(BYTES) / (1024 * 1024) AS MB_USED
        FROM
            DBA_SEGMENTS
        WHERE
            OWNER LIKE 'APEX%' -- Replace with your APEX schema name
        GROUP BY
            OWNER;


        exit;
EOF
    "
}

# Run the query for the CDB (root container)
# echo "Gathering APEX usage for CDB (root container)..." >> "$OUTPUT_FILE"
# run_query 'CDB\$ROOT'

# 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 usage for PDB: $PDB..." >> "$OUTPUT_FILE"
            run_query "$PDB"
        fi
    done < "$PDB_LIST_FILE"
else
    echo "No PDBs found or could not access v\$pdbs view" >> "$OUTPUT_FILE"
fi

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