#!/bin/bash

#=================================================
# GENERIC STARTING
#=================================================
# IMPORT GENERIC HELPERS
#=================================================

source _common.sh
source /usr/share/yunohost/helpers

#=================================================
# RETRIEVE ARGUMENTS
#=================================================

app=${YNH_APP_INSTANCE_NAME:-$YNH_APP_ID}

final_path=$(ynh_app_setting_get $app final_path)

#=================================================
# SPECIFIC CODE
#=================================================
# DECLARE GENERIC FUNCTION
#=================================================

config_file="$final_path/Backup_list.conf"
passkey="$final_path/passkey"

get_config_value() {
	option_name="$1"
	# Get the value of this option in the config file
	grep "^$option_name=" "$config_file" | cut -d= -f2
}

#=================================================
# LOAD VALUES
#=================================================

# Load the real value from the app config or elsewhere.
# Then get the value from the form.
# If the form has a value for a variable, take the value from the form,
# Otherwise, keep the value from the app config.

# Encryption
old_encrypt="$(get_config_value encrypt)"
encrypt="${YNH_CONFIG_MAIN_ENCRYPTION_ENCRYPT:-$old_encrypt}"
# Encryption password
ynh_print_OFF
old_encrypt_password="$(cat $passkey)"
encrypt_password="${YNH_CONFIG_MAIN_ENCRYPTION_ENCRYPTION_PWD:-$old_encrypt_password}"
ynh_print_ON
# ynh_core_backup
old_ynh_core_backup="$(get_config_value ynh_core_backup)"
ynh_core_backup="${YNH_CONFIG_MAIN_BACKUP_TYPES_CORE_BACKUP:-$old_ynh_core_backup}"
# ynh_app_backup
if [ -n "$(get_config_value ynh_app_backup)" ]
then
	old_ynh_app_backup="true"
else
	old_ynh_app_backup="false"
fi
ynh_app_backup="${YNH_CONFIG_MAIN_BACKUP_TYPES_APPS_BACKUP:-$old_ynh_app_backup}"
# Frequency
old_frequency="$(grep "^frequency: " "/etc/yunohost/apps/$app/settings.yml" | cut -d' ' -f2)"
frequency="${YNH_CONFIG_MAIN_BACKUP_OPTIONS_FREQUENCY:-$old_frequency}"
# Max size
old_max_size="$(get_config_value max_size)"
max_size="${YNH_CONFIG_MAIN_BACKUP_OPTIONS_MAX_SIZE:-$old_max_size}"

# Overwrite cron file
old_overwrite_cron="$(ynh_app_setting_get $app overwrite_cron)"
old_overwrite_cron=$(bool_to_true_false $old_overwrite_cron)
overwrite_cron="${YNH_CONFIG_MAIN_OVERWRITE_FILES_OVERWRITE_CRON:-$old_overwrite_cron}"

#=================================================
# SHOW_CONFIG FUNCTION FOR 'SHOW' COMMAND
#=================================================

show_config() {
	# here you are supposed to read some config file/database/other then print the values
	# echo "YNH_CONFIG_${PANEL_ID}_${SECTION_ID}_${OPTION_ID}=value"
	echo "YNH_CONFIG_MAIN_ENCRYPTION_ENCRYPT=$encrypt"
	echo "YNH_CONFIG_MAIN_ENCRYPTION_ENCRYPTION_PWD="

	echo "YNH_CONFIG_MAIN_BACKUP_TYPES_CORE_BACKUP=$ynh_core_backup"
	echo "YNH_CONFIG_MAIN_BACKUP_TYPES_APPS_BACKUP=$ynh_app_backup"

	echo "YNH_CONFIG_MAIN_BACKUP_OPTIONS_FREQUENCY=$frequency"
	echo "YNH_CONFIG_MAIN_BACKUP_OPTIONS_MAX_SIZE=$max_size"

	echo "YNH_CONFIG_MAIN_OVERWRITE_FILES_OVERWRITE_CRON=$overwrite_cron"
}

#=================================================
# MODIFY THE CONFIGURATION
#=================================================

apply_config() {
	# Change the password if needed
	if [ "$encrypt" = "true" ]; then
		ynh_print_OFF
		test -n "$encrypt_password" || ynh_die "The password for encryption can't be empty if you choose to enable encryption."
		ynh_print_ON
		# Replace the password by the previous one
		passkey="$final_path/passkey"
		ynh_print_OFF; echo "$encrypt_password" > "$passkey"; ynh_print_ON
		chmod 400 "$passkey"
		ynh_replace_string "^cryptpass=.*" "cryptpass=$passkey" "$config_file"
	fi

	# Change encrypt in the config file
	ynh_replace_string "^encrypt=.*" "encrypt=$encrypt" "$config_file"

	# Change ynh_core_backup in the config file
	ynh_replace_string "^ynh_core_backup=.*" "ynh_core_backup=$ynh_core_backup" "$config_file"

	# Change ynh_app_backup in the config file
	if [ "$ynh_app_backup" = "true" ] && [ "$old_ynh_app_backup" = "false" ]
	then
		# If ynh_app_backup changed from false to true.
		# Add all current applications to the backup
		while read backup_app
		do
			ynh_print_info "Add a backup for the app $backup_app." >&2
			ynh_replace_string "^ynh_app_backup=$" "ynh_app_backup=$backup_app\n&" "$config_file"
		done <<< "$(yunohost app list -i | grep id: | sed 's/.*id: //')"
	elif [ "$ynh_app_backup" = "false" ] && [ "$old_ynh_app_backup" = "true" ]
	then
		# Remove all app currently backup
		# By deleting all line starting by 'ynh_app_backup=' and having something after '='
		sed -i "/^ynh_app_backup=.\+$/d" "$config_file"
	fi

	# Change frequency in the cron file and store the value into the settings
	ynh_app_setting_set $app frequency "$frequency"
	if [ "$frequency" = "Daily" ]; then
		cron_freq="0 2 * * *"
		run_freq="every day"
	elif [ "$frequency" = "Each 3 days" ]; then
		cron_freq="0 2 */3 * *"
		run_freq="each 3 days"
	elif [ "$frequency" = "Weekly" ]; then
		cron_freq="0 2 * * 0"
		run_freq="once a week on sunday"
	elif [ "$frequency" = "Biweekly" ]; then
		cron_freq="0 2 * * 0/2"
		run_freq="one sunday out of two"
	else	# Monthly
		cron_freq="0 2 1 * *"
		run_freq="once a month on the first sunday"
	fi
	ynh_replace_string ".* root" "$cron_freq root" /etc/cron.d/$app

	# Change max_size in the config file
	ynh_replace_string "^max_size=.*" "max_size=$max_size" "$config_file"

	# Set overwrite_cron
	overwrite_cron=$(bool_to_01 $overwrite_cron)
	ynh_app_setting_set $app overwrite_cron "$overwrite_cron"
}

#=================================================
# GENERIC FINALIZATION
#=================================================
# SELECT THE ACTION FOLLOWING THE GIVEN ARGUMENT
#=================================================

case $1 in
  show) show_config;;
  apply) apply_config;;
esac