#!/bin/zsh

usage() {
    echo "Usage: tanext [TASK_ID]"
}
verify_args() {
    if [[ $# -eq 0 ]]; then
        CURRENT_TASKS_JSON=$(task +ACTIVE export)
        MOTHER_UUID=$(echo "$CURRENT_TASKS_JSON" | jq -r '.[0].MOTHER')

        if [[ $(echo "$CURRENT_TASKS_JSON" | jq -r 'length') -ne 1 ]]; then
            echo "Something went wrong! The number of active tasks is not equal to 1."
            return 1
        fi

        if [[ $(echo "$CURRENT_TASKS_JSON" | jq -r '.[0].SEQ_NEXT') == "null" ]]; then
            MOTHER_NEXT=$(task "$MOTHER_UUID" export | jq -r '.[0].SEQ_NEXT')

            if [[ "$MOTHER_NEXT" == "null" ]]; then
                echo "There is no next task."
                return 1
            fi

            NEXT=$(task "$MOTHER_NEXT" export | jq -r '.[0].SEQ_CURRENT')
        else
            NEXT=$(echo "$CURRENT_TASKS_JSON" | jq -r '.[0].SEQ_NEXT')
        fi
    else
        usage
        return 1
    fi
}

main() {
    fypm ta-done -s "$NEXT"

    task "$MOTHER_UUID" modify SEQ_CURRENT:"$NEXT"
}
verify_args $@ || exit 1
main