#!/bin/bash
# Check if jq is installed. If not, display instructions and abort program
command -v jq >/dev/null 2>&1 || { echo -e "This tool requires jq.\nFor installation instructions, visit https://stedolan.github.io/jq/download/.\n\nAborting..."; exit 1; }

# curl installed? If not, give a hint
command -v curl >/dev/null 2>&1 || { echo -e "This tool requires curl.\n\nAborting..."; exit 1; }

FULL_OUTPUT='false'
URL='http://localhost:8080'
PASSWORD=''

# -------------------- METHODS

displayhelp() {
    echo -e "Usage: eclair-cli [OPTION]... [COMMAND]
Client for an eclair node.

With COMMAND is one of the command listed by \e[01;33meclair-cli help\e[0m.

  -p <password>         api's password
  -a <address>          Override the api URL with <address>
  -v                    Outputs full json returned by the API

Examples:
  eclair-cli -a localhost:1234 peers     list the peers
  eclair-cli close 006fb...              closes the channel with id 006fb...

Note: Uses the json-rpc api exposed by the node on localhost:8080. Make sure the api is enabled.
Full documentation at: <https://github.com/ACINQ/eclair>"
}

# Executes a JSON RPC call to a node listening on ${URL}
call() {
    jqexp='if .error == null then .result else .error.message end'
    # override default jq parsing expression
    if [ $# -ge 3 ] && [ ${FULL_OUTPUT} == "false" ]; then jqexp=${3}; fi
    # set password
    if [ -z ${PASSWORD} ]; then auth="eclair-cli";
    else auth="eclair-cli:"${PASSWORD}; fi
    eval curl "--user ${auth} --silent --show-error -X POST -H \"Content-Type: application/json\" -d '{ \"method\": \"'${1}'\", \"params\": '${2}' }' ${URL}" | jq -r "$jqexp"
}

# get script options
while getopts 'vu:p:a:' flag; do
    case "${flag}" in
        p)  PASSWORD="${OPTARG}" ;;
        a)  URL="${OPTARG}" ;;
        v)  FULL_OUTPUT="true" ;;
        *)  echo -e "\nAborting..."; exit 1; ;;
    esac
done

shift $(($OPTIND - 1))

# assigning JSON RPC method and params values from arguments
METHOD=${1}
shift 1

# Create a JSON Array containing the remaining program args as QUOTED STRINGS, separated with a `,` character
PARAMS=""
i=1
for arg in "${@}"; do
	if [ $i -eq 1 ]; then PARAMS=$(printf '"%s"' "$arg");
	else PARAMS=$(printf '%s,"%s"' "$PARAMS" "$arg");
	fi
	let "i++"
done;
PARAMS="[${PARAMS}]"

# Whatever the arguments provided to eclair-cli, a call to the API will be sent. Let it fail!
case ${METHOD}_${#} in
    ""_*)           displayhelp ;;
    "help"*)        displayhelp
                    echo -e "\nAvailable commands:\n"
                    call "help" [] ;;

    "connect_3")    call ${METHOD} "'$(printf '["%s","%s",%s]' "${1}" "${2}" "${3}")'" ;; # ${3} is numeric

    "open_4")       call ${METHOD} "'$(printf '["%s",%s,%s,%s]' "${1}" "${2}" "${3}" "${4}")'" ;; # ${2} ${3} ${4} are numeric (funding, push, flags)
    "open_3")       call ${METHOD} "'$(printf '["%s",%s,%s]' "${1}" "${2}" "${3}")'" ;; # ${2} ${3} are numeric (funding, push)
    "open_2")       call ${METHOD} "'$(printf '["%s",%s]' "${1}" "${2}")'" ;; # ${2} is numeric (funding)

    "receive_2")    call ${METHOD} "'$(printf '[%s,"%s"]' "${1}" "${2}")'" ;; # ${1} is numeric (amount to receive)
    "receive_3")    call ${METHOD} "'$(printf '[%s,"%s",%s]' "${1}" "${2}" "${3}")'" ;; # ${1} is numeric (amount to receive) as is ${2} for expiry in seconds

    "channel_"*)    call ${METHOD} "'${PARAMS}'" "if .error != null then .error.message else .result | { nodeId, shortChannelId: .data.shortChannelId, channelId, state, balanceSat: (try (.data.commitments.localCommit.spec.toLocalMsat / 1000 | floor) catch null), capacitySat: .data.commitments.commitInput.amountSatoshis, channelPoint: .data.commitments.commitInput.outPoint } end" ;;

    "channels_"*)   call ${METHOD} "'${PARAMS}'" "if .error != null then .error.message else .result | map( { nodeId, shortChannelId: .data.shortChannelId, channelId, state, balanceSat: (try (.data.commitments.localCommit.spec.toLocalMsat / 1000 | floor) catch null), capacitySat: .data.commitments.commitInput.amountSatoshis, channelPoint: .data.commitments.commitInput.outPoint } ) end" ;;

    "send_3")       call ${METHOD} "'$(printf '[%s,"%s","%s"]' "${1}" "${2}" "${3}")'" ;; # ${1} is numeric (amount of the payment)
    "send_2")       call ${METHOD} "'$(printf '["%s",%s]' "${1}" "${2}")'" ;; # ${2} is numeric (amount overriding the payment request)

    "audit_2")      call ${METHOD} "'$(printf '[%s,%s]' "${1}" "${2}")'" ;; # ${1} and ${2} are numeric (unix timestamps)
    
    "networkfees_2")      call ${METHOD} "'$(printf '[%s,%s]' "${1}" "${2}")'" ;; # ${1} and ${2} are numeric (unix timestamps)

    *)              # Default case.
                    # Sends the method and, for parameters, use the JSON table containing the remaining args.
                    #
                    # NOTE: Arguments will be sent as QUOTED STRING so if this particular API call requires an INT param,
                    # this call will fail. In that case, a specific rule for that method MUST be set and the ${PARAMS} JSON array can not be used.
                    call ${METHOD} "'${PARAMS}'" ;;

esac