#!/bin/bash

# Copyright (C) 2022 Ortega Froysa, Nicolás <nicolas@ortegas.org>
# Author: Ortega Froysa, Nicolás <nicolas@ortegas.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

ISIDORE_VERSION="0.1.0"
ISIDORE_CONFIG_DIR=""
ISIDORE_CONFIG_DIR_OPTIONS=(
	"$XDG_CONFIG_HOME/isidore"
	"$HOME/.isidore")
ISIDORE_AUTHOR_NAME=""

PROG_NAME=$0
PROJECT_NAME="Isidore"

##
# Create the configuration file. This function is called if it does not already
# exist.
##
function create_config_file()
{
	echo "Creating $ISIDORE_CONFIG_DIR/config file..."
	echo "Please enter the following..."
	echo -n "Author name: "
	read ISIDORE_AUTHOR_NAME
	echo "ISIDORE_AUTHOR_NAME=\"$ISIDORE_AUTHOR_NAME\"" > $ISIDORE_CONFIG_DIR/config
}

##
# Read the configuration file and set the basic config variables.
##
function set_config_vars()
{
	for i in "${ISIDORE_CONFIG_DIR_OPTIONS[@]}"
	do
		if [ -d $i ]
		then
			ISIDORE_CONFIG_DIR=$i
			break
		fi
	done

	if [ -z "$ISIDORE_CONFIG_DIR" ]
	then
		if ! [ -z "$XDG_CONFIG_HOME" ]
		then
			ISIDORE_CONFIG_DIR="$XDG_CONFIG_HOME/isidore"
		else
			ISIDORE_CONFIG_DIR="$HOME/.isidore"
		fi

		echo "Creating new Jerome configuration directory in $ISIDORE_CONFIG_DIR"
		mkdir -p $ISIDORE_CONFIG_DIR
		create_config_file
	fi

	if ! [ -f "$ISIDORE_CONFIG_DIR/config" ]
	then
		create_config_file
	fi
	source $ISIDORE_CONFIG_DIR/config
}

##
# Print the usage of the Isidore command.
##
function print_usage()
{
	echo "USAGE: $PROG_NAME <command> [options]"
}

function print_help()
{
	print_usage
	echo -e "\nCOMMANDS:
  new [-i] <dir>
    Create a new Isidore project (use interactive mode with '-i')
  build
    Build the project rooted in the current directory
  serve | server
    Serve a local HTTP server of the output directory on port 8080
  clean
    Clean the built files
  version
    Print the current version
  help
    Show this help information"
}

##
# Check to see if at the root of an Isidore project.
##
function check_in_project()
{
	if ! [ -f "./config.php" ] || ! [ -f "./.isidore-version" ]
	then
		echo "ERROR: You are not currently in the root of an Isidore project."
		exit 1
	fi
}

##
# Create a new project.
#
# Params:
#  $1 - The project directory
#  $2 - Interactive mode (1 = true; 0 = false)
##
function new_project()
{
	echo "$PROJECT_NAME v$ISIDORE_VERSION"

	NEW_PROJECT_DIR=$1
	NEW_PROJECT_NAME="New Project"
	NEW_PROJECT_URL="http://example.com/"
	if [ $2 == 1 ]
	then
		echo -n "Project name: "
		read NEW_PROJECT_NAME
		echo -n "URL: "
		read NEW_PROJECT_URL
	fi
	mkdir $NEW_PROJECT_DIR
	mkdir -p $NEW_PROJECT_DIR/site/
	mkdir -p $NEW_PROJECT_DIR/templates/
	echo \
"<?php
\$site_name = \"$NEW_PROJECT_NAME\";
\$site_author = \"$ISIDORE_AUTHOR_NAME\";
\$site_url = \"$NEW_PROJECT_URL\";
?>" >> $NEW_PROJECT_DIR/config.php
	echo "$ISIDORE_VERSION" > $NEW_PROJECT_DIR/.isidore-version

	echo "New project created."
	[ $2 == 0 ] &&
		echo "Consider taking a look at the $NEW_PROJECT_DIR/config.php file."
}

##
# Clean a project's build.
##
function clean_project()
{
	check_in_project
	if [ -d "./output/" ]
	then
		rm -r ./output/
	fi
	echo "Project cleaned."
}

##
# Build the project.
##
function build_project()
{
	check_in_project

	mkdir -p ./output/
	WORKDESK="/tmp/isidore-workdesk"
	CFG_HEADER_FILE="$WORKDESK/config-header.php"
	mkdir -p $WORKDESK
	for i in $(find site/ -name '*.php' -not -name '*.cfg.php')
	do
		echo "<?php include getcwd() . '/config.php'; ?>" > $CFG_HEADER_FILE
		mkdir -p $WORKDESK/${i%/*}
		cat $CFG_HEADER_FILE $i > $WORKDESK/$i
		# the 4 offset is to avoid including `site/`
		: ${i:4}
		OUT_DIR="./output/${_%/*}"
		mkdir -p $OUT_DIR
		: ${i: :-4}
		OUT_FILE="$OUT_DIR/${_##*/}"
		php $WORKDESK/$i > $OUT_FILE
	done

	for i in $(find site/ -type f -not -name '*.php')
	do
		mkdir -p ./output/${i%/*}
		cp $i ./output/$i
	done

	rm -r $WORKDESK
}

set_config_vars

case $1 in
	new)
		if [ $# -lt 2 ]
		then
			echo "Insufficient number of arguments."
			print_usage
			exit 1
		fi
		INTERACTIVE=0
		NEW_DIR=""
		for i in ${@:2}
		do
			case $i in
				-i)
					INTERACTIVE=1;;
				*)
					if [ -z "$NEW_DIR" ]
					then
						NEW_DIR="$i"
					else
						echo "Unknown argument for new '$i'. Use the 'help' command."
						print_usage
						exit 1
					fi
			esac
		done
		new_project $NEW_DIR $INTERACTIVE;;
	build)
		build_project;;
	serve|server)
		php -S localhost:8080 -t ./output/;;
	clean)
		clean_project;;
	help)
		print_help;;
	version)
		echo "$PROJECT_NAME v$ISIDORE_VERSION";;
	*)
		echo "Unknown command $1. Use the 'help' command."
		print_usage
		exit 1;;
esac