#!/bin/bash

# process for getting firmware (at least for gen3)
# 1. get the app id (e.g. MiniPMG3) from /rpc/Shelly.GetDeviceInfo on the device
# 2. load the json firmware list from https://updates.shelly.cloud/update/{APP}
# 3. download the firmware from the url for the desired channel

if ! command -v curl >/dev/null 2>&1; then
    echo "curl not found; please install curl" >&2
    exit 1
fi

if ! command -v jq >/dev/null 2>&1; then
    echo "jq not found; please install jq" >&2
    exit 1
fi


app=$1

if [ -z "${app}" ]; then
    echo "usage: $0 <app> [<channel>]" >&2
    exit 1
fi

appinfo=$(curl --insecure --fail --no-progress-meter "https://updates.shelly.cloud/update/${app}")
if [ $? != 0 ]; then
    exit 1
fi


channel=$2

if [ -z "${channel}" ]; then
    # No channel specified, list available channels
    echo ${appinfo} | jq '(["channel", "version"]  | (., map(length*"-"))), (. | with_entries( select(.value | type == "object" and has("url") )) | keys[] as $k | [ ($k), (.[$k].version) ]) | @tsv' -r
    exit 0
fi


# get url and version for chosen channel

url=`echo ${appinfo} | jq ".${channel}.url" -r`

if [ -z "${url}" ] || [ "${url}" = "null" ]; then
    echo "channel ${channel} doesn't exist or no url found" >&2
    exit 1
fi

version=`echo ${appinfo} | jq ".${channel}.version" -r`

if [ -z "${version}" ] || [ "${version}" = "null" ]; then
    echo "channel ${channel} doesn't exist or no version found" >&2
    exit 1
fi

declare -l app_lowercase="${app}"

filename="shelly-${app_lowercase}-${version}.zip"

curl --insecure -o ${filename} ${url}
echo "${filename}"