#!/bin/bash

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

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

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

app=$YNH_APP_INSTANCE_NAME

final_path=$(ynh_app_setting_get --app=$app --key=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

# Compression algorithms
old_ynh_compression="$(get_config_value ynh_compression_mode)"
old_ynh_compression=${old_ynh_compression:-gzip}
ynh_compression="${YNH_CONFIG_MAIN_COMPRESSION_YNH:-$old_ynh_compression}"
old_files_compression="$(get_config_value files_compression_mode)"
old_files_compression=${old_files_compression:-gzip}
files_compression="${YNH_CONFIG_MAIN_COMPRESSION_FILES:-$old_files_compression}"

# 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 "$(get_config_value ynh_app_backup)" ]
then
    old_ynh_app_backup="1"
else
    old_ynh_app_backup="0"
fi
ynh_app_backup="${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 $app overwrite_cron)"
overwrite_cron="${YNH_CONFIG_MAIN_OVERWRITE_FILES_OVERWRITE_CRON:-$old_overwrite_cron}"

# Type of admin mail configuration
old_admin_mail_html="$(ynh_app_setting_get $app admin_mail_html)"
admin_mail_html="${YNH_CONFIG_MAIN_GLOBAL_CONFIG_EMAIL_TYPE:-$old_admin_mail_html}"

#=================================================
# 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_MAIN_ENCRYPTION_ENCRYPT=$encrypt"
    ynh_return "YNH_CONFIG_MAIN_ENCRYPTION_ENCRYPTION_PWD="

    ynh_return "YNH_CONFIG_MAIN_COMPRESSION_YNH=$ynh_compression"
    ynh_return "YNH_CONFIG_MAIN_COMPRESSION_FILES=$files_compression"

    ynh_return "YNH_CONFIG_MAIN_BACKUP_TYPES_CORE_BACKUP=$ynh_core_backup"
    ynh_return "YNH_CONFIG_MAIN_BACKUP_TYPES_APPS_BACKUP=$ynh_app_backup"

    ynh_return "YNH_CONFIG_MAIN_BACKUP_OPTIONS_FREQUENCY=$frequency"
    ynh_return "YNH_CONFIG_MAIN_BACKUP_OPTIONS_MAX_SIZE=$max_size"

    ynh_return "YNH_CONFIG_MAIN_OVERWRITE_FILES_OVERWRITE_CRON=$overwrite_cron"

    ynh_return "YNH_CONFIG_MAIN_GLOBAL_CONFIG_EMAIL_TYPE=$admin_mail_html"
}

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

apply_config() {

    #=================================================
    # MODIFY THE PASSWORD
    #=================================================

    # Change the password if needed
    if [ "$encrypt" = "1" ]
    then
        ynh_print_OFF
        test -n "$encrypt_password" || ynh_die --message="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 --match_string="^cryptpass=.*" --replace_string="cryptpass=$passkey" --target_file="$config_file"
    fi

    #=================================================
    # MODIFY ENCRYPT SETTING
    #=================================================

    # Change encrypt in the config file
    ynh_replace_string --match_string="^encrypt=.*" --replace_string="encrypt=$encrypt" --target_file="$config_file"

    #=================================================
    # MODIFY SETTINGS
    #=================================================

    # Change the compression algorithms
    # Replace "No compression" by "none" for the config file
    if [ "$ynh_compression" == "No compression" ]; then
        ynh_compression=none
    fi
    if [ "$ynh_compression" != "$old_ynh_compression" ]
    then
        # Update the config, or add the config if not yet existing
        if grep "^ynh_compression_mode=" "$config_file"
        then
            ynh_replace_string --match_string="^ynh_compression_mode=.*" --replace_string="ynh_compression_mode=$ynh_compression" --target_file="$config_file"
        else
            echo "ynh_compression_mode=$ynh_compression" >> "$config_file"
        fi
    fi
    # Replace "No compression" by "none" for the config file
    if [ "$files_compression" == "No compression" ]; then
        files_compression=none
    fi
    if [ "$files_compression" != "$old_files_compression" ]
    then
        # Update the config, or add the config if not yet existing
        if grep "^files_compression_mode=" "$config_file"
        then
            ynh_replace_string --match_string="^files_compression_mode=.*" --replace_string="files_compression_mode=$files_compression" --target_file="$config_file"
        else
            echo "files_compression_mode=$files_compression" >> "$config_file"
        fi
        
    fi

    # Change ynh_core_backup in the config file
    ynh_replace_string --match_string="^ynh_core_backup=.*" --replace_string="ynh_core_backup=$ynh_core_backup" --target_file="$config_file"

    # Change ynh_app_backup in the config file
    if [ "$ynh_app_backup" = "1" ] && [ "$old_ynh_app_backup" = "0" ]
    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 --message="Add a backup for the app $backup_app."
            ynh_replace_string --match_string="^ynh_app_backup=$" --replace_string="ynh_app_backup=$backup_app\n&" --target_file="$config_file"
        done <<< "$(yunohost app list -i | grep id: | sed 's/.*id: //')"
    elif [ "$ynh_app_backup" = "0" ] && [ "$old_ynh_app_backup" = "1" ]
    then
        # Remove all app currently backup
        # By deleting all line starting by 'ynh_app_backup=' and having something after '='
        sed -i "/^ynh_app_backup=.\+$/d" "$config_file"
    fi

    # Change frequency in the cron file and store the value into the settings
    ynh_app_setting_set --app=$app --key=frequency --value="$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 --match_string=".* root" --replace_string="$cron_freq root" --target_file=/etc/cron.d/$app

    # Change max_size in the config file
    ynh_replace_string --match_string="^max_size=.*" --replace_string="max_size=$max_size" --target_file="$config_file"

    #=================================================
    # MODIFY OVERWRITTING SETTINGS
    #=================================================

    # Set overwrite_cron
    ynh_app_setting_set --app=$app --key=overwrite_cron --value="$overwrite_cron"

    #=================================================
    # MODIFY EMAIL SETTING
    #=================================================

    # Set admin_mail_html
    ynh_app_setting_set --app=$app --key=admin_mail_html --value="$admin_mail_html"
}

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

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