#!/bin/bash

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

source /usr/share/yunohost/helpers

#=================================================
# MANAGE SCRIPT FAILURE
#=================================================

# Exit if an error occurs during the execution of the script
ynh_abort_if_errors

#=================================================
# LOAD SETTINGS
#=================================================

app=$YNH_APP_INSTANCE_NAME
domain=$(ynh_app_setting_get $app domain)
path_url=$(ynh_app_setting_get $app path) # used during nginx configuration
is_public=$(ynh_app_setting_get $app is_public)
port=$(ynh_app_setting_get $app port)
mattermost_user="$app"

root_path="$(pwd)/.."
final_path="/var/www/$app"
data_path="/home/yunohost.app/$app"
logs_path="/var/log/$app"

#=================================================
# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
#=================================================

# Backup the current version of the app
# (NB: `tee` uses process substitution rather than a pipe,
# to avoid spawning a subshell that would not save global
# variables defined by `ynh_backup_before_upgrade`.)
ynh_backup_before_upgrade > >(tee "upgrade.log")
# Ensure the backup can be restored
if grep -q "mattermost: Warning$" "upgrade.log"; then
  can_restore_backup=false
else
  can_restore_backup=true
fi

# If the upgrade fails…
ynh_clean_setup () {
  if [ "$can_restore_backup" = true ]; then
    # Stop attempting to restart the app
    if $(systemctl -q is-active "$app"); then
      systemctl stop "$app"
    fi
    # Restore the backup
    ynh_restore_upgradebackup

  else
    # Backup restoration is not available:
    # let's try at least to restart the server.
    systemctl start "$app"
  fi
}

# Exit if an error occurs during the execution of the script
ynh_abort_if_errors

#=================================================
# STOP SERVER
#=================================================

# Stop the server (if the app is already using systemd)
if $(systemctl -q is-active "$app"); then
  systemctl stop "$app"
fi

# Legacy, for previous versions of this app which used supervisor
if [ -f "/etc/supervisor/conf.d/${app}.conf" ]; then
  supervisorctl stop "$app"
  rm -f "/etc/supervisor/conf.d/${app}.conf"
fi

#=================================================
# BACKUP CONFIGURATION FILE
#=================================================

config_file="$final_path/config/config.json"
backup_config_file="/tmp/config.json"

cp -f "$config_file" "$backup_config_file"

#=================================================
# MIGRATE SETTINGS FROM PREVIOUS VERSIONS
#=================================================

# Convert is_public from "Yes"/"No" to 1 / 0
if [[ $is_public == "Yes" ]]; then
  is_public=1
elif [[ $is_public == "No" ]]; then
  is_public=0
fi
ynh_app_setting_set "$app" is_public "$is_public"

# Save the port used if not present
if ! [[ "$port" ]]; then
  port=8065
  ynh_app_setting_set "$app" port "$port"
fi

#=================================================
# DOWNLOAD, CHECK AND UNPACK SOURCE
#=================================================

ynh_app_setting_set "$app" final_path "$final_path"
ynh_setup_source "$final_path"

#=================================================
# RESTORE CONFIGURATION FILE
#=================================================

cp -f "$backup_config_file" "$config_file"

#=================================================
# NGINX CONFIGURATION
#=================================================

ynh_add_nginx_config

#=================================================
# SYSTEMD CONFIGURATION
#=================================================

ynh_add_systemd_config

#=================================================
# ADVERTISE SERVICE IN ADMIN PANEL
#=================================================

yunohost service add "$app" --log "$logs_path/mattermost.log"

#=================================================
# SPECIFIC UPGRADE STEPS
#=================================================

# Fix log FileLocation path (changed in Mattermost 3.8, makes Mattermost >= 4.2 crash)
# https://docs.mattermost.com/administration/changelog.html#release-v3-8-3
ynh_replace_string --match_string "\"FileLocation\": \"/var/log/mattermost.log\"" --replace_string "\"FileLocation\": \"/var/log\"" --target_file "$config_file"

# Move log files to a directory (rather than directly in /var/log)
# See https://github.com/YunoHost-Apps/mattermost_ynh/issues/61
mkdir -p "$logs_path"
ynh_replace_string --match_string "\"FileLocation\": \"/var/log\"" --replace_string "\"FileLocation\": \"$logs_path\"" --target_file "$config_file"
if [ -f "/var/log/${app}.log" ]; then
  mv "/var/log/${app}.log" "$logs_path/"
fi

#=================================================
# RESTORE FILE PERMISSIONS
#=================================================

chown -R "$mattermost_user:www-data" "$final_path"
chown -R "$mattermost_user:www-data" "$data_path"
chown -R "$mattermost_user:adm"      "$logs_path"

#=================================================
# RELOAD NGINX
#=================================================

service nginx reload

#=================================================
# START SERVER
#=================================================

systemctl start "$app"