#!/usr/bin/bash

function get_category_names () {
	local -n OUTPUT_CATEGORY_NAMES_VAR="${1:?"get_category_names : Output variable not provided"}"
	local CATEGORY_NAME

	for category_path in $BLOG_DIR/posts/*; do
		CATEGORY_NAME="${category_path/*\//}"
		OUTPUT_CATEGORY_NAMES_VAR+=( "$CATEGORY_NAME" )
	done
}

function get_category_paths () {
	local -a CATEGORY_PATHS=( $BLOG_DIR/posts/* ) CATEGORY_NAMES
	local -n OUTPUT_CATEGORY_VAR="${1:?"get_categories : No category variable provided"}"

	for path in ${CATEGORY_PATHS[@]}; do
		OUTPUT_CATEGORY_VAR[${path/*\//}]=$path
	done

}

function get_posts_in_category () {
	local -A CATEGORIES
	local CATEGORY_NAME="${1:?"get_posts_in_category : Category name not provided"}"
	local -n OUTPUT_POST_VAR="${2:?"get_posts_in_category : Output variable not provided"}"

	get_category_paths CATEGORIES

	if [[ "${!CATEGORIES[@]}" != *$CATEGORY_NAME* ]]; then
		echo "get_posts_in_category : There is no category by that name"
		exit
	fi

	CATEGORY_PATH="${CATEGORIES[$CATEGORY_NAME]}"

	for post in ${CATEGORY_PATH}/*.wiki; do
		FULLPATH=$post
		FILENAME="${post/*\/}"
		TIMESTAMP=`cut -d '-' -f 1 <<< "$FILENAME"`
		DATE=`date -d @$TIMESTAMP +"$DATE_FORMAT"`
		WIKI_PATH=/posts/$CATEGORY_NAME/$FILENAME
		POST_TITLE="`grep '%title' $FULLPATH | cut -d ' ' -f 2-` ($DATE)"
		DATA="$FULLPATH:$WIKI_PATH:$POST_TITLE" 
		OUTPUT_POST_VAR+=( "$DATA" )

	done

}

function get_posts_by_category () {
	local -a CATEGORY_NAMES POSTS
	local -A POST_BY_CATEGORY
	local post_string

	local -n OUTPUT_POST_ASSOCIATIVE_ARRAY="${1:?"get_posts_by_category : Output variable not provided"}"

	get_category_names CATEGORY_NAMES

	for name in ${CATEGORY_NAMES[@]}; do
		get_posts_in_category $name POSTS
		for i in ${!POSTS[@]}; do
			post="${POSTS[$i]}"
			if [[ "$post_string" ]]; then
				post_string+="${POST_DELIMITER}${post}"
			else
				post_string="$post"
			fi
		done

		OUTPUT_POST_ASSOCIATIVE_ARRAY[$name]="$post_string"

		post_string=""
		unset POSTS
	done
}

function deserialize_posts () {
	local -n OUTPUT_POST_ARRAY="${1:?"deserialize_posts : Output variable not provided"}"
	local SERIALIZED_POSTS="${2:?"deserialize_posts : Serialized posts not provided"}"

	OIFS=$IFS
	IFS="$POST_DELIMITER"
	read -a OUTPUT_POST_ARRAY <<< "$SERIALIZED_POSTS"
}