#!/bin/bash

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

source /usr/share/yunohost/helpers

# Stop script if errors
ynh_abort_if_errors

# Import common fonctions
source ./experimental_helper.sh
source ./_common.sh

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

app=$YNH_APP_INSTANCE_NAME
report_stats=$(ynh_app_setting_get --app $app --key report_stats)
allow_public_rooms=$(ynh_app_setting_get --app=$app --key=allow_public_rooms)
backup_before_upgrade=$(ynh_app_setting_get --app $app --key disable_backup_before_upgrade)
is_public=$(ynh_app_setting_get --app $app --key is_public)

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

show_config() {
    # here you are supposed to read some config file/database/other then print the values
    # ynh_return "YNH_CONFIG_${PANEL_ID}_${SECTION_ID}_${OPTION_ID}=value"
    ynh_return "YNH_CONFIG_SYNAPSE_CONFIG_SERVER_CONFIG_SERVER_STATISTICS=$report_stats"
    ynh_return "YNH_CONFIG_SYNAPSE_CONFIG_SERVER_CONFIG_ALLOW_PUBLIC_ROOMS=$allow_public_rooms"

    if [[ ${backup_before_upgrade:-0} -eq 1 ]]
    then
        ynh_return "YNH_CONFIG_PACKAGE_CONFIG_PACKAGE_CONFIG_BACKUP_BEFORE_UPGRADE=false"
    else
        ynh_return "YNH_CONFIG_PACKAGE_CONFIG_PACKAGE_CONFIG_BACKUP_BEFORE_UPGRADE=true"
    fi

    if [[ ${is_public} -eq 1 ]]
    then
        ynh_return "YNH_CONFIG_SYNAPSE_CONFIG_SERVER_CONFIG_IS_PUBLIC=true"
    else
        ynh_return "YNH_CONFIG_SYNAPSE_CONFIG_SERVER_CONFIG_IS_PUBLIC=false"
    fi
}

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

apply_config() {
    report_stats=${YNH_CONFIG_SYNAPSE_CONFIG_SERVER_CONFIG_SERVER_STATISTICS:-$report_stats}
    allow_public_rooms=${YNH_CONFIG_SYNAPSE_CONFIG_SERVER_CONFIG_ALLOW_PUBLIC_ROOMS:-$allow_public_rooms}
    backup_before_upgrade=${YNH_CONFIG_PACKAGE_CONFIG_PACKAGE_CONFIG_BACKUP_BEFORE_UPGRADE:-$backup_before_upgrade}
    is_public=${YNH_CONFIG_SYNAPSE_CONFIG_SERVER_CONFIG_IS_PUBLIC:-$is_public}

    ynh_app_setting_set --app $app --key report_stats --value $report_stats
    ynh_app_setting_set --app $app --key allow_public_rooms --value $allow_public_rooms
    ynh_app_setting_set --app $app --key is_public --value $is_public

    if [ $backup_before_upgrade == 1 ]; then
        ynh_app_setting_set --app $app --key disable_backup_before_upgrade --value 0
    else
        ynh_app_setting_set --app $app --key disable_backup_before_upgrade --value 1
    fi

    domain=$(ynh_app_setting_get --app $app --key domain)
    server_name=$(ynh_app_setting_get --app $app --key server_name)
    synapse_db_pwd=$(ynh_app_setting_get --app $app --key synapse_db_pwd)
    is_public=$(ynh_app_setting_get --app $app --key is_public)
    port=$(ynh_app_setting_get --app $app --key synapse_port)
    synapse_tls_port=$(ynh_app_setting_get --app $app --key synapse_tls_port)
    turnserver_tls_port=$(ynh_app_setting_get --app $app --key turnserver_tls_port)
    turnserver_pwd=$(ynh_app_setting_get --app $app --key turnserver_pwd)
    registration_shared_secret=$(ynh_app_setting_get --app $app --key registration_shared_secret)
    form_secret=$(ynh_app_setting_get --app $app --key form_secret)
    macaroon_secret_key=$(ynh_app_setting_get --app=$app --key=macaroon_secret_key)

    synapse_user="matrix-$app"
    synapse_db_name="matrix_$app"
    synapse_db_user="matrix_$app"

    # Configure Synapse

    # WARNING : theses command are used in INSTALL, UPGRADE, CONFIG, CHANGE-URL (4 times)
    # For any update do it in all files

    homeserver_config_path="/etc/matrix-$app/homeserver.yaml"

    ynh_backup_if_checksum_is_different "$homeserver_config_path"

    cp ../conf/homeserver.yaml "$homeserver_config_path"
    cp ../conf/log.yaml /etc/matrix-$app/log.yaml

    ynh_replace_string --match_string __APP__ --replace_string $app --target_file "$homeserver_config_path"
    ynh_replace_string --match_string __DOMAIN__ --replace_string $domain --target_file "$homeserver_config_path"
    ynh_replace_string --match_string __SERVER_NAME__ --replace_string $server_name --target_file "$homeserver_config_path"   
    ynh_replace_string --match_string __SYNAPSE_DB_USER__ --replace_string $synapse_db_user --target_file "$homeserver_config_path"
    ynh_replace_special_string --match_string __SYNAPSE_DB_PWD__ --replace_string $synapse_db_pwd --target_file "$homeserver_config_path"
    ynh_replace_string --match_string __PORT__ --replace_string $port --target_file "$homeserver_config_path"
    ynh_replace_string --match_string __TLS_PORT__ --replace_string $synapse_tls_port --target_file "$homeserver_config_path"
    ynh_replace_string --match_string __TURNSERVER_TLS_PORT__ --replace_string $turnserver_tls_port --target_file "$homeserver_config_path"
    ynh_replace_special_string --match_string __TURNPWD__ --replace_string $turnserver_pwd --target_file "$homeserver_config_path"
    ynh_replace_special_string --match_string __REGISTRATION_SECRET__ --replace_string "$registration_shared_secret" --target_file "$homeserver_config_path"
    ynh_replace_special_string --match_string __FORM_SECRET__ --replace_string "$form_secret" --target_file "$homeserver_config_path"
    ynh_replace_string --match_string __REPORT_STATS__ --replace_string "$report_stats" --target_file "$homeserver_config_path"
    ynh_replace_string --match_string=__ALLOW_PUBLIC_ROOMS__ --replace_string="$allow_public_rooms" --target_file="$homeserver_config_path"
    if [ -n $macaroon_secret_key ]; then
        # Well, in this package this value was not managed because it was not needed, synapse is able to generate this with some other secret in the config file but after some vulnerability was found with this practice.
        # The problem is that we can't just say generate a new value if the package has not already defined a value. The reason is that changing this value logout all user. And in case of a user has enabled the encryption, the user might lost all conversation !!
        # So for the old install we just leave this as it is. And for the new install we use a real macaroon.
        # For more detail about this issue you can see : https://matrix.org/blog/2019/01/15/further-details-on-critical-security-update-in-synapse-affecting-all-versions-prior-to-0-34-1-cve-2019-5885/
        ynh_replace_string --match_string='macaroon_secret_key: "__MACAROON_SECRET_KEY__"' --replace_string='# macaroon_secret_key: "__MACAROON_SECRET_KEY__"' --target_file="$homeserver_config_path"
    else
        ynh_replace_special_string --match_string=__MACAROON_SECRET_KEY__ --replace_string="$macaroon_secret_key" --target_file="$homeserver_config_path"
    fi

    if [ "$is_public" = "0" ]
    then
        ynh_replace_string __ALLOWED_ACCESS__ False "$homeserver_config_path"
    else
        ynh_replace_string __ALLOWED_ACCESS__ True "$homeserver_config_path"
    fi

    ynh_store_file_checksum --file "$homeserver_config_path"
    setfacl -R -m user:turnserver:rX  /etc/matrix-$app

    systemctl restart matrix-$app
}

#=================================================
# GENERIC FINALIZATION
#=================================================
# SELECT THE ACTION FOLLOWING THE GIVEN ARGUMENT
#=================================================
case $1 in
    show) show_config;;
    apply) apply_config;;
esac