#!/bin/sh
#
# Copyright (c) 2021-2022, Christer Edwards <christer.edwards@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
#
# * Neither the name of the copyright holder nor the names of its
#   contributors may be used to endorse or promote products derived from
#   this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

. /usr/local/libexec/rocinante/common.sh
. /usr/local/etc/rocinante.conf

verify_usage() {
    error_exit "Usage: rocinante verify TEMPLATE"
}

handle_template_include() {
    case ${TEMPLATE_INCLUDE} in
        http?://*/*/*)
            rocinante fetch "${TEMPLATE_INCLUDE}"
        ;;
        */*)
            ROCINANTE_TEMPLATE_USER=$(echo "${TEMPLATE_INCLUDE}" | awk -F / '{ print $1 }')
            ROCINANTE_TEMPLATE_REPO=$(echo "${TEMPLATE_INCLUDE}" | awk -F / '{ print $2 }')
            rocinante verify "${ROCINANTE_TEMPLATE_USER}/${ROCINANTE_TEMPLATE_REPO}"
        ;;
        *)
            error_exit "Template INCLUDE content not recognized."
    ;;
    esac
}

verify_template() {
    _template_path=${rocinante_templatesdir}/${ROCINANTE_TEMPLATE}
    _hook_validate=0

    for _hook in TARGET INCLUDE PRE OVERLAY FSTAB PF PKG SYSRC SERVICE CMD Bastillefile; do
        _path=${_template_path}/${_hook}
        if [ -s "${_path}" ]; then
            _hook_validate=$((_hook_validate+1))
            info "Detected ${_hook} hook."

            ## line count must match newline count
            if [ $(wc -l "${_path}" | awk '{print $1}') -ne $(grep -c $'\n' "${_path}") ]; then
                info "[${_hook}]:"
                error_notify "${ROCINANTE_TEMPLATE}:${_hook} [failed]."
                error_notify "Line numbers don't match line breaks."
                echo
                error_exit "Template validation failed."
            ## if INCLUDE; recursive verify
            elif [ "${_hook}" = 'INCLUDE' ]; then
                info "[${_hook}]:"
                cat "${_path}"
                echo
                while read _include; do
                    info "[${_hook}]:[${_include}]:"
                    TEMPLATE_INCLUDE="${_include}"
                    handle_template_include
                done < "${_path}"

            ## if tree; tree -a rocinante_template/_dir
            elif [ "${_hook}" = 'OVERLAY' ]; then
                info "[${_hook}]:"
                cat "${_path}"
                echo
                while read _dir; do
                    info "[${_hook}]:[${_dir}]:"
                        if [ -x "/usr/local/bin/tree" ]; then
                            /usr/local/bin/tree -a "${_template_path}/${_dir}"
                        else
                           find "${_template_path}/${_dir}" -print | sed -e 's;[^/]*/;|___;g;s;___|; |;g'
                        fi
                    echo
                done < "${_path}"
            elif [ "${_hook}" = 'Bastillefile' ]; then
                info "[${_hook}]:"
                cat "${_path}"
                while read _line; do
                    _cmd=$(echo "${_line}" | awk '{print tolower($1);}')
                    ## if include; recursive verify
                    if [ "${_cmd}" = 'include' ]; then
                        TEMPLATE_INCLUDE=$(echo "${_line}" | awk '{print $2;}')
                        handle_template_include
                    fi
                done < "${_path}"
                echo
            else
                info "[${_hook}]:"
                cat "${_path}"
                echo
            fi
        fi
    done

    ## remove bad templates
    if [ "${_hook_validate}" -lt 1 ]; then
        error_notify "No valid template hooks found."
        error_notify "Template discarded."
        rm -rf "${rocinante_template}"
        exit 1
    fi

    ## if validated; ready to use
    if [ "${_hook_validate}" -gt 0 ]; then
        info "Template ready to use."
    fi
}

# Handle special-case commands first.
case "$1" in
help|-h|--help)
    verify_usage
    ;;
esac

if [ $# -gt 1 ] || [ $# -lt 1 ]; then
    verify_usage
fi

case "$1" in
http?*)
    verify_usage
    ;;
*/*)
    ROCINANTE_TEMPLATE=$1
    verify_template
    ;;
*)
    verify_usage
    ;;
esac
