#!/bin/bash
set -u

# THIS SCRIPT FOR DEBUGGING AND TESTING ONLY

DEFAULT_TABLE=TARGET_INFO_GPU

function print_usage()
{
    cat << EOF
$(basename "$0")[:<table_name>] -- Return Table

    <table_name> : The name of an SQLite table

    Output defined by <table_name>.

    This report accepts a database table (or view) name and
    executes the statement "SELECT * FROM <table_name>".  It is
    mostly for debugging/testing.  If no <table_name> is given,
    the table ${DEFAULT_TABLE} will be used.
EOF
}

### BEGIN include inc_setup ###

EXIT_HELP=25
EXIT_DB=26
EXIT_NODATA=27

# Verify number of params
if [ $# -lt 1 ]
then
    print_usage ${BASH_SOURCE[0]}
    exit ${EXIT_HELP}
fi

# Set DB file
DATABASE="$1"

# Verify DB file exists
if [ ! -f "${DATABASE}" ]
then
    exit ${EXIT_DB}
fi

# Verify DB file contents
# The sqlite3 file format is defined at https://sqlite.org/fileformat.html
DB_FILE_HEADER=$(head -c 16 "$DATABASE" | tr '\0' '\n')
if [ "${DB_FILE_HEADER}" != "SQLite format 3" ]
then
    exit ${EXIT_DB}
fi

# Helper function for error messages
function echoerr() # accepts multiple args
{
    echo "$@" >&2
}

# Setup standard vars

# If we were run by nsys, the path to the preferred sqlite3 should have been
# passed as an env-var.  If not, hope the user has it in their path.
SQLITE3="${NSYS_STATS_SCRIPTS_SQLITE:-sqlite3}"
SQLITE3OPTS="-header -csv -readonly"

RUN_SQLITE="eval \"${SQLITE3}\" ${SQLITE3OPTS} \"${DATABASE}\""

### END include inc_setup ###

### BEGIN: include from inc_table_exists ###

TABLE_EXISTS_TABLES=( )

function table_exists()
{
    local TABLE_NAME=$1

    if [ "${#TABLE_EXISTS_TABLES[@]}" -eq 0 ]
    then
        TABLE_EXISTS_TABLES=( $("${SQLITE3}" ${SQLITE3OPTS} "${DATABASE}" \
                "SELECT name FROM sqlite_master WHERE type = 'table' OR type = 'view'") )
    fi

    for TABLE in "${TABLE_EXISTS_TABLES[@]}"
    do
        if [ "${TABLE}" = "${TABLE_NAME}" ]
        then
            echo "true"
            return 1
        fi
    done
    echo "false"
    return 0
}

### END: include from inc_table_exists ###


TABLENAME=${2:-${DEFAULT_TABLE}}

if ! $(table_exists "$TABLENAME")
then
    echoerr "$DATABASE does not contain the $TABLENAME table. Exiting."
    exit ${EXIT_NODATA}
fi

${RUN_SQLITE} << EOF

SELECT * FROM "${TABLENAME}"
;
EOF
