#!/usr/bin/env bash

set -eEuo pipefail

. "${SCRIPT_DIR}/read.bash"

_update_course() {
	local dept_code="${COURSE_DATA["dept_code"]^^}"
	local dept_name="${COURSE_DATA["dept_name"]}"
	local course_num="${COURSE_DATA["course_num"]}"
	local course_name="${COURSE_DATA["course_name"]}"
	local course_sched="${COURSE_DATA["course_sched"]}"
	local course_start="${COURSE_DATA["course_start"]}"
	local course_end="${COURSE_DATA["course_end"]}"
	local course_hours="${COURSE_DATA["course_hours"]}"
	local course_size="${COURSE_DATA["course_size"]}"

	cat <<-__EOS__ >"${DATA_DIR}/${dept_code}${course_num}.crs"
		${dept_code} ${dept_name}
		${course_name}
		${course_sched} ${course_start} ${course_end} ${course_hours} ${course_size}
	__EOS__
}

update_course() {
	local create="${1:-}"
	local dept_code
	local dept_name
	local course_num
	local course_name
	local course_sched
	local course_start
	local course_end
	local course_hours
	local course_size

	read -r -p "Department code: " dept_code
	read -r -p "Department name: " dept_name
	read -r -p "Course number: " course_num
	read -r -p "Course name: " course_name
	read -r -p "Scheduled days: " course_sched
	read -r -p "Course start: " course_start
	read -r -p "Course end: " course_end
	read -r -p "Credit hours: " course_hours
	read -r -p "Enrolled students: " course_size

	if [[ -z "$dept_code" ]] || [[ -z "$course_num" ]]; then
		err "must provide a department code and course number"
		return
	fi

	local course_file="${DATA_DIR}/${dept_code^^}${course_num}.crs"
	if [[ "$create" ]]; then
		if [[ -f "$course_file" ]]; then
			err "course already exists"
			return 1
		fi
	else
		_read_course "${dept_code^^}" "$course_num" || return
	fi

	COURSE_DATA["dept_code"]="${dept_code:-${COURSE_DATA["dept_code"]}}"
	COURSE_DATA["dept_name"]="${dept_name:-${COURSE_DATA["dept_name"]}}"
	COURSE_DATA["course_num"]="${course_num:-${COURSE_DATA["course_num"]}}"
	COURSE_DATA["course_name"]="${course_name:-${COURSE_DATA["course_name"]}}"
	COURSE_DATA["course_sched"]="${course_sched:-${COURSE_DATA["course_sched"]}}"
	COURSE_DATA["course_start"]="${course_start:-${COURSE_DATA["course_start"]}}"
	COURSE_DATA["course_end"]="${course_end:-${COURSE_DATA["course_end"]}}"
	COURSE_DATA["course_hours"]="${course_hours:-${COURSE_DATA["course_hours"]}}"
	COURSE_DATA["course_size"]="${course_size:-${COURSE_DATA["course_size"]}}"
	_update_course

	if [[ "$create" ]]; then
		log "CREATED" "${COURSE_DATA["dept_code"]} ${COURSE_DATA["course_num"]} ${COURSE_DATA["course_name"]}"
	else
		log "UPDATED" "${COURSE_DATA["dept_code"]} ${COURSE_DATA["course_num"]} ${COURSE_DATA["course_name"]}"
	fi
}