#!/bin/sh

# TODO find pieces of apache conf in /etc
# TODO Handle /sur/share/scripts/vhost...
# TODO total by host: vhost, htaccess, conf, cgi

set -e

apache_dir=/etc/apache2
apache_conf=$apache_dir/apache2.conf

tmp_dir=/tmp/apache-require
mkdir -p "$tmp_dir"
confs=$tmp_dir/confs
confs_vhost=$tmp_dir/confs_vhost
confs_system=$tmp_dir/confs_system
confs_htaccess=$tmp_dir/confs_htaccess
result=$tmp_dir/result
summary=$tmp_dir/summary

module_loaded() {
    apache2ctl -D DUMP_MODULES | grep -q access_compat_module
}

# Get all apache config files
get_confs() {
    # Initialize le the list of configuration files with the default conf
    test ! -e "$confs" && printf "%s\\n" $apache_conf > "$confs"

    cd "$apache_dir"
    # TODO: Refactor this mess
    confs_size=0
    while [ "$confs_size" -lt "$(stat -c %s "$confs")" ]; do
        confs_size=$(stat -c %s "$confs")
        for conf_file in $(cat "$confs"); do
            # XXX: Expand the filenames
            for glob in $(awk '/^[[:space:]]*Include/ {print $2}' "$conf_file"); do
                realpath --no-symlinks $glob >> "$confs"
            done
        done
        sort "$confs" | uniq > "$confs"_tmp && mv "$confs"_tmp "$confs"
    done
    cd - 1>/dev/null
}

# Find all the .htaccess uder each DocumentRoot
get_htaccess() {
    xargs -P 0 \
        awk 'sub("^[[:space:]]*DocumentRoot[[:space:]]*", "")' \
        < "$confs" \
        | sort -u \
        | xargs -P 0 -I _ find _ -name .htaccess || true
}

# Put different type of configs in different files
categorize_confs() {
    get_htaccess > "$confs_htaccess"
    grep -E "^${apache_dir}/sites-enabled/.*\\.conf" "$confs" > "$confs_vhost"
    grep -Ev "^${apache_dir}/sites-enabled/.*\\.conf" "$confs" > "$confs_system"
}

count_directives() {
    directives="Allow Order Deny Satisfy"

    for directive in $directives; do
        export "$directive"="$(grep -Ec "^[[:blank:]]*$directive\\s" "$1")"
    done

    # shellcheck disable=SC2154
    if [ "$Allow" -ne 0 ] || [ "$Order" -ne 0 ] || \
        [ "$Deny" -ne 0 ] || [ "$Satisfy" -ne 0 ]; then
        printf "%s %d %d %d %d\\n" "$1" "$Allow" "$Order" "$Deny" "$Satisfy"
    fi
}

# Results per files
display_results() {
    mv -b "$result" "$result".bak || true

    printf 'File\tAllow\tOrder\tDeny\tSatsify\n' >&2
    # TODO make shellcheck happy
    for file in $(cat $confs); do
        count_directives "$file" | tee -a "$result"
    done
}

get_confs
categorize_confs
display_results