#!/usr/bin/env bash
# --- Generate JavaDoc for jtop ---
# This script generates developer documentation using javadoc.
# If JDK is missing, it prompts the user to install it using the detected package manager.

set -e

SRC_DIR="src"
DOC_DIR="doc"

# --- Detect package manager ---
detect_package_manager() {
	if command -v pacman >/dev/null 2>&1; then
		echo "pacman"
	elif command -v apt >/dev/null 2>&1; then
		echo "apt"
	elif command -v dnf >/dev/null 2>&1; then
		echo "dnf"
	elif command -v yum >/dev/null 2>&1; then
		echo "yum"
	elif command -v zypper >/dev/null 2>&1; then
		echo "zypper"
	elif command -v brew >/dev/null 2>&1; then
		echo "brew"
	elif command -v apk >/dev/null 2>&1; then
		echo "apk"
	elif command -v emerge >/dev/null 2>&1; then
		echo "emerge"
	else
		echo ""
	fi
}

# --- Generate JDK install command ---
jdk_install_command() {
	local pm="$1"
	case "$pm" in
		pacman) echo "pacman -Sy --noconfirm jdk-openjdk" ;;
		apt) echo "apt update && apt install -y openjdk-21-jdk || apt install -y default-jdk" ;;
		dnf) echo "dnf install -y java-21-openjdk-devel || dnf install -y java-latest-openjdk-devel" ;;
		yum) echo "yum install -y java-21-openjdk-devel || yum install -y java-latest-openjdk-devel" ;;
		zypper) echo "zypper install -y java-21-openjdk-devel || zypper install -y java-latest-openjdk-devel" ;;
		brew) echo "brew install openjdk" ;;
		apk) echo "apk add openjdk21" ;;
		emerge) echo "emerge dev-java/openjdk-bin" ;;
		*) echo "" ;;
	esac
}

# --- Check for javadoc ---
if ! command -v javadoc >/dev/null 2>&1; then
	echo "Java Development Kit (JDK) with javadoc not found."
	PM=$(detect_package_manager)

	if [[ -z "$PM" ]]; then
		echo "Please install the latest JDK manually and rerun this script."
		exit 1
	fi

	CMD=$(jdk_install_command "$PM")
	if [[ $EUID -ne 0 && "$PM" != "brew" ]]; then
		echo "Please rerun this script with sudo if you want automatic JDK installation."
		exit 1
	fi

	# Prompt the user
	read -rp "Do you want to run the following command to install the JDK? [$CMD] (y/n): " ANSWER
	case "$ANSWER" in
		y|Y)
			echo "Installing JDK..."
			eval "$CMD"
			echo "JDK installed successfully."
			;;
		*)
			echo "JDK installation cancelled. Please install manually and rerun."
			exit 1
			;;
	esac
fi

# --- Generate JavaDoc ---
echo "Generating JavaDoc..."
rm -rf "$DOC_DIR"
mkdir -p "$DOC_DIR"

if javadoc -quiet -d "$DOC_DIR" \
	-sourcepath "$SRC_DIR" \
	-subpackages jtop \
	-private \
	-author \
	-version > /dev/null 2>&1; then
	echo -e "\033[32mJavaDoc generated successfully!"
	echo -e "\033[0m→ Open file://$PWD/$DOC_DIR/index.html to view it."
else
	echo -e "\033[31mJavaDoc generation failed (check your paths or source)."
fi