#!/bin/bash

# Define the expected number of columns
EXPECTED_COLUMNS=5

# Input CSV file
CSV_FILE=$1

# Check if the file is provided
if [ -z "$CSV_FILE" ]; then
  echo "Usage: $0 <csv_file>"
  exit 1
fi

# Check if the file exists
if [ ! -f "$CSV_FILE" ]; then
  echo "Error: File '$CSV_FILE' not found."
  exit 1
fi

# Validate each row in the CSV
line_number=0
while IFS= read -r line; do
  line_number=$((line_number + 1))

  # Use a CSV parser to correctly handle quoted fields
  column_count=$(echo "$line" | awk -v FPAT='([^,]*|"[^"]*")' '{print NF}')

  if [ "$column_count" -ne "$EXPECTED_COLUMNS" ]; then
    echo "Error: Line $line_number has $column_count columns (expected $EXPECTED_COLUMNS)."
    exit 1
  fi

done < "$CSV_FILE"

echo "Validation passed: All rows have $EXPECTED_COLUMNS columns."