#!/bin/bash
#
# SN-L00 Autorouting Script using Freerouting
#
# Usage:
#   ./autoroute.sh                    # Uses default paths
#   ./autoroute.sh input.dsn          # Custom input file
#   ./autoroute.sh input.dsn output.ses
#
# Prerequisites:
#   1. Export DSN from KiCad: File → Export → Specctra DSN
#   2. Java runtime installed
#
# After running:
#   Import the .ses file in KiCad: File → Import → Specctra Session
#

set -e

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
FREEROUTING_JAR="${FREEROUTING_JAR:-/tmp/freerouting.jar}"
FREEROUTING_URL="https://github.com/freerouting/freerouting/releases/download/v2.0.1/freerouting-2.0.1.jar"

# Default input/output paths
DSN_FILE="${1:-$PROJECT_DIR/SN-L00.dsn}"
SES_FILE="${2:-${DSN_FILE%.dsn}.ses}"

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

echo -e "${GREEN}SN-L00 Autorouting Script${NC}"
echo "=========================================="

# Check for Java
if ! command -v java &> /dev/null; then
    echo -e "${RED}Error: Java is not installed${NC}"
    echo "Install with: sudo apt install default-jre"
    exit 1
fi

# Download Freerouting if not present
if [[ ! -f "$FREEROUTING_JAR" ]]; then
    echo -e "${YELLOW}Downloading Freerouting...${NC}"
    curl -sL -o "$FREEROUTING_JAR" "$FREEROUTING_URL"
    echo -e "${GREEN}Downloaded to $FREEROUTING_JAR${NC}"
fi

# Check for input DSN file
if [[ ! -f "$DSN_FILE" ]]; then
    echo -e "${RED}Error: DSN file not found: $DSN_FILE${NC}"
    echo ""
    echo "To create the DSN file:"
    echo "  1. Open SN-L00.kicad_pcb in KiCad"
    echo "  2. File → Export → Specctra DSN"
    echo "  3. Save as: $DSN_FILE"
    echo ""
    echo "Then run this script again."
    exit 1
fi

echo "Input:  $DSN_FILE"
echo "Output: $SES_FILE"
echo ""

# Run Freerouting in batch mode
echo -e "${YELLOW}Running Freerouting (this may take a while)...${NC}"
echo ""

# Freerouting command-line options:
#   -de <file>  : Design input file (DSN)
#   -do <file>  : Design output file (SES)
#   -mp <passes>: Max routing passes (default: unlimited)
#   -mt <mins>  : Max time in minutes (optional)
#   -oit        : Order of routing: inside to outside
#   -us         : Use saved rules from DSN file

java -jar "$FREEROUTING_JAR" \
    -de "$DSN_FILE" \
    -do "$SES_FILE" \
    -mp 100 \
    -oit \
    2>&1 | while IFS= read -r line; do
        # Filter and display progress
        if [[ "$line" == *"Pass"* ]] || [[ "$line" == *"route"* ]] || [[ "$line" == *"via"* ]]; then
            echo "  $line"
        fi
    done

# Check if output was created
if [[ -f "$SES_FILE" ]]; then
    echo ""
    echo -e "${GREEN}Routing complete!${NC}"
    echo ""
    echo "Output saved to: $SES_FILE"
    echo ""
    echo "Next steps:"
    echo "  1. Open SN-L00.kicad_pcb in KiCad"
    echo "  2. File → Import → Specctra Session"
    echo "  3. Select: $SES_FILE"
    echo "  4. Press 'B' to fill copper zones"
    echo "  5. Run DRC: Inspect → Design Rules Checker"
else
    echo -e "${RED}Error: Routing failed - no output file created${NC}"
    echo "Try running Freerouting interactively:"
    echo "  java -jar $FREEROUTING_JAR"
    exit 1
fi