#!/bin/bash

#=================================================
# GENERIC START
#=================================================
# IMPORT GENERIC HELPERS
#=================================================

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

#=================================================
# LOAD SETTINGS
#=================================================
ynh_script_progression --message="Loading installation settings..." --weight=1

app=$YNH_APP_INSTANCE_NAME

botname=$(ynh_app_setting_get --app=$app --key=botname)
synapse_instance=$(ynh_app_setting_get --app=$app --key=synapse_instance)
server_name=$(ynh_app_setting_get --app=$app --key=server_name)
db_name=$(ynh_app_setting_get --app=$app --key=db_name)
db_user=$db_name
final_path=$(ynh_app_setting_get --app=$app --key=final_path)
synapse_db_name="matrix_$synapse_instance"
bot_synapse_db_user="@$botname:$server_name"
signald_data="/var/lib/signald"
signald_exe="/usr/bin/signald"
signald_user="signald"

#=================================================
# STANDARD REMOVE
#=================================================
# REMOVE SERVICE INTEGRATION IN YUNOHOST
#=================================================

# Remove the service from the list of services known by YunoHost (added from `yunohost service add`)
if ynh_exec_warn_less yunohost service status $app >/dev/null
then
	ynh_script_progression --message="Removing $app service integration..." --weight=3
	yunohost service remove $app
fi

#=================================================
# STOP AND REMOVE SERVICE
#=================================================
ynh_script_progression --message="Stopping and removing the systemd service..." --weight=1

# Remove the dedicated systemd config
ynh_remove_systemd_config

#=================================================
# REMOVE LOGROTATE CONFIGURATION
#=================================================
ynh_script_progression --message="Removing logrotate configuration..." --weight=1

# Remove the app-specific logrotate config
ynh_remove_logrotate

#=================================================
# REMOVE THE POSTGRESQL DATABASE
#=================================================
ynh_script_progression --message="Removing the PostgreSQL database..." --weight=4

# Remove a database if it exists, along with the associated user
ynh_psql_remove_db --db_user=$db_user --db_name=$db_name
ynh_psql_execute_as_root --database=$synapse_db_name --sql="DROP OWNED BY ""$app"";"
ynh_psql_execute_as_root --database=$synapse_db_name --sql="DROP USER ""$app"";"
ynh_psql_execute_as_root --database=$synapse_db_name --sql="DROP OWNED BY ""$bot_synapse_db_user"";"
ynh_psql_execute_as_root --database=$synapse_db_name --sql="DROP USER ""$bot_synapse_db_user"";"
ynh_psql_execute_as_root --database=$synapse_db_name --sql="DROP OWNED BY ""$botname"";"
ynh_psql_execute_as_root --database=$synapse_db_name --sql="DROP USER ""$botname"";"
ynh_psql_execute_as_root --database=$synapse_db_name --sql="DROP OWNED BY ""$signald_user"";"
ynh_psql_execute_as_root --database=$synapse_db_name --sql="DROP USER ""$signald_user"";"

#=================================================
# REMOVE APP MAIN DIR
#=================================================
ynh_script_progression --message="Removing app main directory..." --weight=1

# Remove the app directory securely
ynh_secure_remove --file="$final_path"

#=================================================
# REMOVE DEPENDENCIES
#=================================================
ynh_script_progression --message="Removing dependencies..." --weight=8

# Remove metapackage and its dependencies
ynh_remove_app_dependencies

#=================================================
# SPECIFIC REMOVE
#=================================================
# REMOVE VARIOUS FILES
#=================================================
ynh_script_progression --message="Removing various files..." --weight=6

ynh_secure_remove --file="$signald_data"
ynh_secure_remove --file="$signald_exe"

# Remove a directory securely
ynh_secure_remove --file="/etc/matrix-$synapse_instance/app-service/$app.yaml"
/opt/yunohost/matrix-$synapse_instance/update_synapse_for_appservice.sh || ynh_die --message="Synapse can't restart with the appservice configuration"

# Remove the log files
ynh_secure_remove --file="/var/log/$app"

#=================================================
# GENERIC FINALIZATION
#=================================================
# REMOVE DEDICATED USER
#=================================================
ynh_script_progression --message="Removing the dedicated system user..." --weight=5

# Delete a system user
ynh_system_user_delete --username=$app
ynh_system_user_delete --username=$signald_user

#=================================================
# END OF SCRIPT
#=================================================

ynh_script_progression --message="Removal of $app completed" --last