#!/bin/sh
# scripts/start.sh
set -e

# Colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m'

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PROJECT_DIR="$(dirname "$SCRIPT_DIR")"

echo -e "${GREEN}=== Furt Lua HTTP-Server Startup ===${NC}"

# User can override this manually if needed:
LUA_COMMAND=""

# Config check first
if [ "$(uname)" = "OpenBSD" ] || [ "$(uname)" = "FreeBSD" ]; then
    CONFIG_FILE="/usr/local/etc/furt/furt.conf"
    PID_FILE="/var/run/furt.pid"
else
    CONFIG_FILE="/etc/furt/furt.conf"
    PID_FILE="/var/run/furt.pid"
fi

if [ ! -f "$CONFIG_FILE" ] && [ ! -f "$PROJECT_DIR/config/furt.conf" ]; then
    echo -e "${RED}Error: furt.conf not found${NC}"
    echo "Create config first in $CONFIG_FILE or $PROJECT_DIR/config/furt.conf"
    exit 1
fi

if [ -z "$LUA_COMMAND" ]; then
    # Test standard distribution paths
    for cmd in lua51 lua5.1; do
        if command -v "$cmd" >/dev/null 2>&1; then
            LUA_COMMAND="$cmd"
            break
        fi
    done
fi

if [ -z "$LUA_COMMAND" ]; then
    echo -e "${RED}Error: No Lua 5.1 found${NC}"
    echo "Install options:"
    echo "  Arch:     pacman -S lua51"
    echo "  OpenBSD:  pkg_add lua51"
    echo "  Debian:   apt install lua5.1"
    echo ""
    echo "Or set: LUA_COMMAND=/custom/path/lua51 at top of this script"
    exit 1
fi

echo -e "${GREEN}Found Lua:${NC} $LUA_COMMAND"

# Dependency checks
# Socket check
$LUA_COMMAND -e "require('socket')" 2>/dev/null || {
    echo -e "${RED}Error: lua-socket not found${NC}"
    echo "Install options:"
    echo "  Arch:     pacman -S lua51-socket"
    echo "  OpenBSD:  pkg_add lua-socket"
    echo "  Debian:   apt install lua-socket"
    exit 1
}

# JSON library check
if ! ($LUA_COMMAND -e "require('cjson')" 2>/dev/null || $LUA_COMMAND -e "require('dkjson')" 2>/dev/null); then
    echo -e "${RED}Error: No JSON library found${NC}"
    echo "Install options:"
    echo "  Arch:     pacman -S lua51-dkjson"
    echo "  OpenBSD:  pkg_add lua-cjson"
    echo "  Debian:   apt install lua-cjson"
    exit 1
fi

# SSL/TLS library check
$LUA_COMMAND -e "require('ssl')" 2>/dev/null || {
    echo -e "${RED}Error: SSL/TLS library not found${NC}"
    echo "Install options:"
    echo "  Arch:     pacman -S lua51-sec"
    echo "  OpenBSD:  pkg_add luasec"
    echo "  Debian:   apt install lua-sec"
    exit 1
}

cd "$PROJECT_DIR"

echo -e "${GREEN}Starting Furt...${NC}"

# PID-File cleanup function
cleanup_pid() {
    if [ -f "$PID_FILE" ]; then
        rm -f "$PID_FILE"
    fi
}

# Service vs Interactive Detection
if [ ! -t 0 ] || [ ! -t 1 ]; then
    # Service mode - Background + PID-File
    echo -e "${GREEN}Service mode: Background + PID-File${NC}"

    # Start process in background
    "$LUA_COMMAND" src/main.lua &
    PID=$!

    # Write PID-File
    echo "$PID" > "$PID_FILE"
    echo -e "${GREEN}Furt started (PID: $PID, PID-File: $PID_FILE)${NC}"

    # Verify process is still running after short delay
    sleep 1
    if ! kill -0 "$PID" 2>/dev/null; then
        echo -e "${RED}Error: Process died immediately${NC}"
        cleanup_pid
        exit 1
    fi

    echo -e "${GREEN}Service startup successful${NC}"
else
    # Interactive mode - Foreground (no PID-File)
    echo -e "${GREEN}Interactive mode: Foreground${NC}"
    exec "$LUA_COMMAND" src/main.lua
fi