#!/bin/bash
set -xe

CONFIG_FILE=$SNAP_DATA/config

declare -A OPTIONS DEFAULTS VALUES
OPTIONS[port]=CACHEPOT_PORT
OPTIONS[log-level]=CACHEPOT_LOG_LEVEL
OPTIONS[cache-dir]=CACHEPOT_DIR
OPTIONS[s3.bucket]=CACHEPOT_BUCKET
OPTIONS[s3.endpoint]=CACHEPOT_ENDPOINT
OPTIONS[s3.key-id]=AWS_ACCESS_KEY_ID
OPTIONS[s3.secret]=AWS_SECRET_ACCESS_KEY
OPTIONS[redis.url]=CACHEPOT_REDIS
OPTIONS[gcs.bucket]=CACHEPOT_GCS_BUCKET
OPTIONS[gcs.key-path]=CACHEPOT_GCS_KEY_PATH
OPTIONS[gcs.rw-mode]=CACHEPOT_GCS_RW_MODE

DEFAULTS[port]=4226
DEFAULTS[cache-dir]=$SNAP_COMMON/cache
DEFAULTS[log-level]=info
DEFAULTS[gcs.rw-mode]=false

VALUES[gcs.rw-mode-true]=READ_WRITE
VALUES[gcs.rw-mode-false]=READ_ONLY

# Iterate through the config options array
for opt in ${!OPTIONS[@]}; do
    # Get environment variable name
    var=${OPTIONS[$opt]}

    # Use snapctl to get the value registered by the snap set command
    value="$(snapctl get $opt)"

    # Fall back to the default value
    [ -n "$value" ] || value="${DEFAULTS[$opt]}"

    # Set the resulting value back to snapctl to populate all keys and defaults
    snapctl set $opt="$value"

    # Map the value using the VALUES map
    value="${VALUES[$opt-$value]-$value}"

    # Write out non-empty variable exports to the config file, preserving
    # calling environment values
    [ -n "$value" ] && echo "export $var=\"\${$var-$value}\"" >> $CONFIG_FILE.new
done

# Move the new config file
mv -f ${CONFIG_FILE}.new $CONFIG_FILE || /bin/true

# Restart the server to pick up new values
systemctl restart snap.cachepot.cachepot-coordinator.service