#!/bin/bash

#=================================================
# COMMON VARIABLES
#=================================================

nodejs_version=14

mongo_version=5.0

#=================================================
# PERSONAL HELPERS
#=================================================

#=================================================
# EXPERIMENTAL HELPERS
#=================================================

readonly YNH_DEFAULT_MONGO_VERSION=4.4
# Declare the actual MongoDB version to use: 4.4 ; 5.0 ; 6.0
# A packager willing to use another version of MongoDB can override the variable into its _common.sh.
YNH_MONGO_VERSION=${YNH_MONGO_VERSION:-$YNH_DEFAULT_MONGO_VERSION}

# Execute a mongo command
#
# example: ynh_mongo_exec --command='db.getMongo().getDBNames().indexOf("wekan")'
# example: ynh_mongo_exec --command="db.getMongo().getDBNames().indexOf(\"wekan\")"
#
# usage: ynh_mongo_exec [--user=user] [--password=password] [--authenticationdatabase=authenticationdatabase] [--database=database] [--host=host] [--port=port] --command="command" [--eval]
# | arg: -u, --user=                        - The user name to connect as
# | arg: -p, --password=                    - The user password
# | arg: -d, --authenticationdatabase=      - The authenticationdatabase to connect to
# | arg: -d, --database=                    - The database to connect to
# | arg: -h, --host=                        - The host to connect to
# | arg: -P, --port=                        - The port to connect to
# | arg: -c, --command=                     - The command to evaluate
# | arg: -e, --eval                         - Evaluate instead of execute the command.
#
#
ynh_mongo_exec() {
    # Declare an array to define the options of this helper.
    local legacy_args=upadhPce
    local -A args_array=( [u]=user= [p]=password= [a]=authenticationdatabase= [d]=database= [h]=host= [P]=port= [c]=command= [e]=eval )
    local user
    local password
    local authenticationdatabase
    local database
    local host
    local port
    local command
    local eval
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"
    user="${user:-}"
    password="${password:-}"
    authenticationdatabase="${authenticationdatabase:-}"
    database="${database:-}"
    host="${host:-}"
    port="${port:-}"
    eval=${eval:-0}

    # If user is provided
    if [ -n "$user" ]
    then
        user="--username=$user"

        # If password is provided
        if [ -n "$password" ]
        then
            password="--password=$password"
        fi

        # If authenticationdatabase is provided
        if [ -n "$authenticationdatabase" ]
        then
            authenticationdatabase="--authenticationDatabase=$authenticationdatabase"
        else
            authenticationdatabase="--authenticationDatabase=admin"
        fi
    else
        password=""
        authenticationdatabase=""
    fi

    # If host is provided
    if [ -n "$host" ]
    then
        host="--host=$host"
    fi

    # If port is provided
    if [ -n "$port" ]
    then
        port="--port=$port"
    fi

    # If eval is not provided
    if [ $eval -eq 0 ]
    then
        # If database is provided
        if [ -n "$database" ]
        then
            database="use $database"
        else
            database=""
        fi

        mongo --quiet $user $password $authenticationdatabase $host $port <<EOF
$database
${command}
quit()
EOF
    else
        # If database is provided
        if [ -n "$database" ]
        then
            database="$database"
        else
            database=""
        fi

        mongo --quiet $database $user $password $authenticationdatabase $host $port --eval="$command"
    fi
}

# Drop a database
#
# [internal]
#
# If you intend to drop the database *and* the associated user,
# consider using ynh_mongo_remove_db instead.
#
# usage: ynh_mongo_drop_db --database=database
# | arg: -d, --database=    - The database name to drop
#
#
ynh_mongo_drop_db() {
    # Declare an array to define the options of this helper.
    local legacy_args=d
    local -A args_array=( [d]=database= )
    local database
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    ynh_mongo_exec --database="$database" --command='db.runCommand({dropDatabase: 1})'
}

# Dump a database
#
# example: ynh_mongo_dump_db --database=wekan > ./dump.bson
#
# usage: ynh_mongo_dump_db --database=database
# | arg: -d, --database=    - The database name to dump
# | ret: the mongodump output
#
#
ynh_mongo_dump_db() {
    # Declare an array to define the options of this helper.
    local legacy_args=d
    local -A args_array=( [d]=database= )
    local database
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    mongodump --quiet --db="$database" --archive
}

# Create a user
#
# [internal]
#
# usage: ynh_mongo_create_user --db_user=user --db_pwd=pwd --db_name=name
# | arg: -u, --db_user=     - The user name to create
# | arg: -p, --db_pwd=      - The password to identify user by
# | arg: -n, --db_name=     - Name of the database to grant privilegies
#
#
ynh_mongo_create_user() {
    # Declare an array to define the options of this helper.
    local legacy_args=unp
    local -A args_array=( [u]=db_user= [n]=db_name= [p]=db_pwd= )
    local db_user
    local db_name
    local db_pwd
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    # Create the user and set the user as admin of the db
    ynh_mongo_exec --database="$db_name" --command='db.createUser( { user: "'${db_user}'", pwd: "'${db_pwd}'", roles: [ { role: "readWrite", db: "'${db_name}'" } ] } );'

    # Add clustermonitoring rights
    ynh_mongo_exec --database="$db_name" --command='db.grantRolesToUser("'${db_user}'",[{ role: "clusterMonitor", db: "admin" }]);'
}

# Check if a mongo database exists
#
# usage: ynh_mongo_database_exists --database=database
# | arg: -d, --database=        - The database for which to check existence
# | exit: Return 1 if the database doesn't exist, 0 otherwise
#
#
ynh_mongo_database_exists() {
    # Declare an array to define the options of this helper.
    local legacy_args=d
    local -A args_array=([d]=database=)
    local database
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    if [ $(ynh_mongo_exec --command='db.getMongo().getDBNames().indexOf("'${database}'")' --eval) -lt 0 ]
    then
        return 1
    else
        return 0
    fi
}

# Restore a database
#
# example: ynh_mongo_restore_db --database=wekan < ./dump.bson
#
# usage: ynh_mongo_restore_db --database=database
# | arg: -d, --database=    - The database name to restore
#
#
ynh_mongo_restore_db() {
    # Declare an array to define the options of this helper.
    local legacy_args=d
    local -A args_array=( [d]=database= )
    local database
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    mongorestore --quiet --db="$database" --archive
}

# Drop a user
#
# [internal]
#
# usage: ynh_mongo_drop_user --db_user=user --db_name=name
# | arg: -u, --db_user=     - The user to drop
# | arg: -n, --db_name=     - Name of the database
#
#
ynh_mongo_drop_user() {
    # Declare an array to define the options of this helper.
    local legacy_args=un
    local -A args_array=( [u]=db_user= [n]=db_name= )
    local db_user
    local db_name
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    ynh_mongo_exec --database="$db_name" --command='db.dropUser("'$db_user'", {w: "majority", wtimeout: 5000})'
}

# Create a database, an user and its password. Then store the password in the app's config
#
# usage: ynh_mongo_setup_db --db_user=user --db_name=name [--db_pwd=pwd]
# | arg: -u, --db_user=     - Owner of the database
# | arg: -n, --db_name=     - Name of the database
# | arg: -p, --db_pwd=      - Password of the database. If not provided, a password will be generated
#
# After executing this helper, the password of the created database will be available in $db_pwd
# It will also be stored as "mongopwd" into the app settings.
#
#
ynh_mongo_setup_db() {
    # Declare an array to define the options of this helper.
    local legacy_args=unp
    local -A args_array=( [u]=db_user= [n]=db_name= [p]=db_pwd= )
    local db_user
    local db_name
    db_pwd=""
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    local new_db_pwd=$(ynh_string_random) # Generate a random password
    # If $db_pwd is not provided, use new_db_pwd instead for db_pwd
    db_pwd="${db_pwd:-$new_db_pwd}"

    # Create the user and grant access to the database
    ynh_mongo_create_user --db_user="$db_user" --db_pwd="$db_pwd" --db_name="$db_name"

    # Store the password in the app's config
    ynh_app_setting_set --app=$app --key=db_pwd --value=$db_pwd
}

# Remove a database if it exists, and the associated user
#
# usage: ynh_mongo_remove_db --db_user=user --db_name=name
# | arg: -u, --db_user=     - Owner of the database
# | arg: -n, --db_name=     - Name of the database
#
#
ynh_mongo_remove_db() {
    # Declare an array to define the options of this helper.
    local legacy_args=un
    local -A args_array=( [u]=db_user= [n]=db_name= )
    local db_user
    local db_name
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    if ynh_mongo_database_exists --database=$db_name; then  # Check if the database exists
        ynh_mongo_drop_db --database=$db_name  # Remove the database
    else
        ynh_print_warn --message="Database $db_name not found"
    fi

    # Remove mongo user if it exists
    ynh_mongo_drop_user --db_user=$db_user --db_name=$db_name
}

# Install MongoDB and integrate MongoDB service in YunoHost
#
# usage: ynh_install_mongo [--mongo_version=mongo_version]
# | arg: -m, --mongo_version=       - Version of MongoDB to install
#
#
ynh_install_mongo() {
    # Declare an array to define the options of this helper.
    local legacy_args=m
    local -A args_array=([m]=mongo_version=)
    local mongo_version
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"
    mongo_version="${mongo_version:-$YNH_MONGO_VERSION}"

    ynh_print_info --message="Installing MongoDB Community Edition..."
    local mongo_debian_release=bullseye #$(ynh_get_debian_release)

  if [[ $(cat /proc/cpuinfo) != *"avx"* && "$mongo_version" != "4.4" ]]; then
    ynh_print_warn --message="Installing Mongo 4.4 as $mongo_version is not compatible with your CPU (see https://docs.mongodb.com/manual/administration/production-notes/#x86_64)."
    mongo_version="4.4"
  fi
  if [[ "$mongo_version" == "4.4" && "$mongo_debian_release" != "buster" ]]; then
    ynh_print_warn --message="Switched to Buster install as Mongo 4.4 is not compatible with $mongo_debian_release."
    mongo_debian_release=buster
  fi

    ynh_install_extra_app_dependencies --repo="deb http://repo.mongodb.org/apt/debian $mongo_debian_release/mongodb-org/$mongo_version main" --package="mongodb-org-server mongodb-org-shell mongodb-database-tools" --key="https://www.mongodb.org/static/pgp/server-$mongo_version.asc"
    mongodb_servicename=mongod

    # Make sure MongoDB is started and enabled
    systemctl enable $mongodb_servicename --quiet
    systemctl daemon-reload --quiet

    ynh_systemd_action --service_name=$mongodb_servicename --action=restart --line_match="aiting for connections" --log_path="/var/log/mongodb/$mongodb_servicename.log"

    # Integrate MongoDB service in YunoHost
    yunohost service add $mongodb_servicename --description="MongoDB daemon" --log="/var/log/mongodb/$mongodb_servicename.log"

    # Store mongo_version into the config of this app
    ynh_app_setting_set --app=$app --key=mongo_version --value=$mongo_version
}

# Remove MongoDB
# Only remove the MongoDB service integration in YunoHost for now
# if MongoDB package as been removed
#
# usage: ynh_remove_mongo
#
#
ynh_remove_mongo() {
    # Only remove the mongodb service if it is not installed.
    if ! ynh_package_is_installed --package="mongodb*"
    then
        ynh_print_info --message="Removing MongoDB service..."
        mongodb_servicename=mongod
        # Remove the mongodb service
        yunohost service remove $mongodb_servicename
        ynh_secure_remove --file="/var/lib/mongodb"
        ynh_secure_remove --file="/var/log/mongodb"
    fi
}