#!/bin/bash
#
#  This file is part of TALER
#  Copyright (C) 2025 Taler Systems SA
#
#  TALER is free software; you can redistribute it and/or modify it under the
#  terms of the GNU General Public License as published by the Free Software
#  Foundation; either version 3, or (at your option) any later version.
#
#  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
#  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License along with
#  TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/license>
#

# Hard error reporting on.
set -eu


# Exit, with error message (hard failure)
function exit_fail() {
    echo " FAIL: " "$@" >&2
    EXIT_STATUS=1
    exit "$EXIT_STATUS"
}

CONF="$HOME/.config/taler-exchange.conf"
VERBOSE=0

while getopts 'ac:hirvV' OPTION;
do
    case "$OPTION" in
        a)
            exit 0
            ;;
        c)
            # shellcheck disable=SC2034
            CONF="$OPTARG"
            ;;
        h)
            echo "This is an AML program that asks the customer to validate a phone number (via SMS) given to the measure from the context. It is to be used when AML officers want a specific address to be validated via postal letter."
            echo 'Supported options:'
            echo '  -a           -- show required attributes'
            # shellcheck disable=SC2016
            echo '  -c $CONF     -- set configuration'
            echo '  -h           -- print this help'
            echo '  -i           -- show required inputs'
            echo '  -r           -- show required context'
            echo '  -v           -- show version'
            echo '  -V           -- be verbose'
            exit 0
            ;;
        i)
            # Need attributes, context and current_rules.
            echo "context"
            echo "current_rules"
            exit 0
            ;;
        r)
            echo "CONTACT_PHONE"
            exit 0
            ;;
        v)
            echo "$0 v0.0.1"
            exit 0
            ;;
        V)
            VERBOSE=1
            ;;
        ?)
        exit_fail "Unrecognized command line option"
        ;;
    esac
done

if [ 1 = "$VERBOSE" ]
then
    echo "Running $0" 1>&2
fi

# See https://docs.taler.net/taler-kyc-manual.html#tsref-type-AmlProgramInput
# for the full JSON with possible inputs.

# First, extract inputs we need
INPUTS=$(jq '{"current_rules":.current_rules,"context":.context}')

# Get address data
CONTACT_PHONE=$(echo "$INPUTS" | jq -r '.context.CONTACT_PHONE')

# Convert address data to Challenger format as best we can.
ADDRESS=$(jq -n \
    --argjson contact_phone \""$CONTACT_PHONE"\" \
    '{"CONTACT_PHONE":$contact_phone,"read_only":true}')

# Get current rules.
CURRENT_RULES=$(echo "$INPUTS" | jq '.current_rules // null')

# Get context values.
EXPIRATION_TIME=$(echo "$INPUTS" | jq '.context.expiration_time // .current_rules.expiration_time // null')

# Get successor measure from current rules, if any (still applies if this new measure expires)
CSUCCESSOR_MEASURE=$(echo "$INPUTS" | jq '.current_rules.successor_measure // null')
# Context for AML program EXEC_NAME, if any.
NEXT_CONTEXT=$(echo "$INPUTS" | jq '.context.next_context // {}')
# Get successor program from context
EXEC_NAME=$(echo "$INPUTS" | jq '.context.exec_name // "taler-exchange-helper-measure-inform-investigate"')


# Define custom measure for SMS/phone validation.
# We always first run a program to clear the address validation measure,
# and then run whatever program we were given from the context (if any).
# If none was given in the context, we run 'inform-investigate'.
CUSTOM_AMEASURES=$(jq -n \
    --argjson address "$ADDRESS" \
    --argjson en "$EXEC_NAME" \
    --argjson nc "$NEXT_CONTEXT" \
    '{"custom-phone-investigation":{"context":{"initial_address":$address,"exec_name":$en,"next_context":$nc,"clear_measure":"custom-phone-investigation"},"check_name":"sms-registration","prog_name":"clear-measure-and-continue"}}')

# Finally, output the new rules.
# See https://docs.taler.net/taler-kyc-manual.html#tsref-type-AmlOutcome
# for the required output format.

jq -n \
    --argjson et "$EXPIRATION_TIME" \
    --argjson sm "$CSUCCESSOR_MEASURE" \
    --argjson nm '"custom-phone-investigation"' \
    --argjson cma "$CUSTOM_AMEASURES" \
    --argjson nr "$CURRENT_RULES" \
    '{"new_measures":$nm,"new_rules":($nr+{"expiration_time":$et,"successor_measure":$sm,"custom_measures":({}+$nr.custom_measures+$cma)})}|del(..|nulls)'

exit 0
