#!/usr/bin/env bash

# Rebuilds tag_*.html files
# if no arguments given, rebuilds all of them
# if arguments given, they should have this format:
# "FILE1 [FILE2 [...]]" "TAG1 [TAG2 [...]]"
# where FILEn are files with posts which should be used for rebuilding tags,
# and TAGn are names of tags which should be rebuilt.
# example:
# rebuild_tags "one_post.html another_article.html" "example-tag another-tag"
# mind the quotes!
declare prefix_tags
declare cut_do
declare cut_line
declare template_read_more
declare template_tag_title
declare global_title
declare global_author

rebuild_tags() {
    if (($# < 2)); then
        # will process all files and tags
        files=$(ls -t ./*.html)
        all_tags=yes
    else
        # will process only given files and tags
        files=$(printf '%s\n' "$1" | sort -u)
        # shellcheck disable=SC2086 # Intended splitting of $files
        files=$(ls -t $files)
        tags=$2
    fi
    echo -n "Rebuilding tag pages "
    #n=0
    if [[ -n $all_tags ]]; then
        rm ./"$prefix_tags"*.html &>/dev/null
    else
        for i in $tags; do
            rm "./$prefix_tags$i.html" &>/dev/null
        done
    fi
    # First we will process all files and create temporal tag files
    # with just the content of the posts
    tmpfile=tmp.$RANDOM
    while [[ -f $tmpfile ]]; do tmpfile=tmp.$RANDOM; done
    while IFS='' read -r i; do
        is_boilerplate_file "$i" && continue
        echo -n "."
        if [[ -n $cut_do ]]; then
            get_html_file_content 'entry' 'entry' 'cut' <"$i" | awk "/$cut_line/ { print \"<p class=\\\"readmore\\\"><a href=\\\"$i\\\">$template_read_more</a></p>\" ; next } 1"
        else
            get_html_file_content 'entry' 'entry' <"$i"
        fi >"$tmpfile"
        for tag in $(tags_in_post "$i"); do
            if [[ -n $all_tags || " $tags " == *" $tag "* ]]; then
                cat "$tmpfile" >>"$prefix_tags$tag".tmp.html
            fi
        done
    done <<<"$files"
    rm "$tmpfile"
    # Now generate the tag files with headers, footers, etc
    while IFS='' read -r i; do
        tagname=${i#./"$prefix_tags"}
        tagname=${tagname%.tmp.html}
        create_html_page "$i" "$prefix_tags$tagname.html" yes "$global_title &mdash; $template_tag_title \"$tagname\"" "$global_author"
        rm "$i"
    done < <(ls -t ./"$prefix_tags"*.tmp.html 2>/dev/null)
    echo
}