#!/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"

SOURCE_DIR="site/"
OUTPUT_DIR="output/"
TEMPLATE_DIR="templates/"
PROJECT_CONFIG_FILE="config.php"

##
# 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
  build [-v] [-j<n>]
    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 "$PROJECT_CONFIG_FILE" ] || ! [ -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"

	local NEW_PROJECT_DIR=$1
	local NEW_PROJECT_NAME="New Project"
	local 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 $NEW_PROJECT_DIR/$SOURCE_DIR
	mkdir -p $NEW_PROJECT_DIR/$TEMPLATE_DIR
	echo \
"<?php
\$site_name = \"$NEW_PROJECT_NAME\";
\$site_author = \"$ISIDORE_AUTHOR_NAME\";
\$site_url = \"$NEW_PROJECT_URL\";
?>" >> $NEW_PROJECT_DIR/$PROJECT_CONFIG_FILE
	echo "$ISIDORE_VERSION" > $NEW_PROJECT_DIR/.isidore-version

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

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

##
# Build the project.
#
# Params:
#  $1 - Verbose flag
#  $2 - Maximum number of jobs to run
##
function build_project()
{
	check_in_project

	mkdir -p $OUTPUT_DIR

	for i in $(find $SOURCE_DIR -type d)
	do
		mkdir -p $OUTPUT_DIR/${i:${#SOURCE_DIR}}
	done

	# number of current jobs
	local NUM_JOBS="\j"

	for i in $(find site -type f -regextype posix-extended -not -regex '.*\.(cfg|CFG)\.(php|PHP)')
	do
		while (( $2 != 0 )) && (( ${NUM_JOBS@P} >= $2 ))
		do
			wait -n
		done

		# parallel block
		(
			if [[ $i =~ .*\.(php|PHP) ]]
			then
				: ${i:${#SOURCE_DIR}}
				local OUT_FILE="$OUTPUT_DIR/${_: :-4}"
				if [ $1 == 1 ]
				then
					echo "Building $OUT_FILE ..."
				fi
				cat $PROJECT_CONFIG_FILE $i | php > $OUT_FILE
			else
				local OUT_FILE="$OUTPUT_DIR/${i:${#SOURCE_DIR}}"
				if [ $1 == 1 ]
				then
					echo "Copying $OUT_FILE ..."
				fi
				cp $i $OUT_FILE
			fi
		) &
	done

	# wait for jobs to finish
	wait -n
}

set_config_vars

if [ $# -lt 1 ]
then
	echo "No subcommand was specified. Use the 'help' subcommand."
	print_usage
	exit 1
fi

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' subcommand."
						print_usage
						exit 1
					fi;;
			esac
		done
		new_project $NEW_DIR $INTERACTIVE;;
	build)
		VERBOSE=0
		JOBS=1
		for i in ${@:2}
		do
			case $i in
				-v)
					VERBOSE=1;;
				-j*)
					if ! [[ "$i" =~ ^-j[0-9]+$ ]]
					then
						echo "Argument '$i' badly formatted. Should be '-j<n>' where <n> is a number."
						print_usage
						exit 1
					fi
					JOBS=${i:2};;
				*)
					echo "Unknown argument for build '$i'. Use the 'help' subcommand."
					print_usage
					exit 1;;
			esac
		done
		build_project $VERBOSE $JOBS;;
	serve|server)
		php -S localhost:8080 -t $OUTPUT_DIR/;;
	clean)
		clean_project;;
	help)
		print_help;;
	version)
		echo "$PROJECT_NAME v$ISIDORE_VERSION";;
	*)
		echo "Unknown command $1. Use the 'help' subcommand."
		print_usage
		exit 1;;
esac