#!/bin/bash

# Script to create a new C project with JCL and source file
# Usage: ./newjob.sh <NAME>
# NAME must be 8 characters or less (MVS member name restriction)

set -e

if [ $# -ne 1 ]; then
    echo "Usage: $0 <NAME>"
    echo "  NAME: 8 characters or less (will be uppercased for MVS)"
    echo ""
    echo "Example:"
    echo "  $0 hello"
    exit 1
fi

NAME_INPUT="$1"
NAME=$(echo "$NAME_INPUT" | tr '[:lower:]' '[:upper:]')

# Validate name length (MVS member names are max 8 characters)
if [ ${#NAME} -gt 8 ]; then
    echo "Error: Name '$NAME' is longer than 8 characters (${#NAME} chars)"
    echo "MVS member names must be 8 characters or less"
    exit 1
fi

# Validate name format (alphanumeric, must start with letter)
if ! [[ "$NAME" =~ ^[A-Z][A-Z0-9]*$ ]]; then
    echo "Error: Name '$NAME' must start with a letter and contain only letters and numbers"
    exit 1
fi

JCL_FILE="jcl/${NAME}.jcl"
SRC_FILE="src/${NAME}.c"

# Check if files already exist
if [ -f "$JCL_FILE" ]; then
    echo "Error: JCL file '$JCL_FILE' already exists"
    exit 1
fi

if [ -f "$SRC_FILE" ]; then
    echo "Error: Source file '$SRC_FILE' already exists"
    exit 1
fi

# Create JCL from template
if [ ! -f "jcl/TEMPLATE.jcl" ]; then
    echo "Error: Template file 'jcl/TEMPLATE.jcl' not found"
    exit 1
fi

echo "Creating new C project: $NAME"
echo ""

# Replace {NAME} placeholders in template
sed "s/{NAME}/$NAME/g" jcl/TEMPLATE.jcl > "$JCL_FILE"
echo "✓ Created JCL: $JCL_FILE"

# Create empty C source file
touch "$SRC_FILE"
echo "✓ Created source: $SRC_FILE"

echo ""
echo "Project '$NAME' created successfully!"
echo "Next steps:"
echo "  1. Edit $SRC_FILE with your C code"
echo "  2. Commit and push to trigger mainframe build"