#!/bin/bash
if [ "$1" == "-h" ] ; then
    echo "
    sbib - search for citekey in a bibtex.bib (or maybe eventually bibjson.json) file and return a bibliography entry in markdown or possibly other format
         usage:
          sbib
          # use 'a' flag to search all 
          sbib a
          # pass a custom citation style and database
          sbib a citeprocStyle.csl bibdFile.json

         depends: 
          fzf
          git grep
          pandoc
          pandoc-citeproc
          wl-copy

         defaults:
          Set the required default file locations (csl file, bib file)
 
    "
    exit 0
fi

#Setup defaults
cslFile=${2:-$HOME/projects/bibd/bibd-md.csl}
bibdFile=${3:-$HOME/projects/bibd/OMEGA.bib}
cd $(dirname $bibdFile)
set -e #exit if an error

#set pattern to the null character '\0' for search all, else search only cite keys
if [ "$1" == "a" ]; then
    sPattern='\0'
else
    sPattern="@[a-zA-Z_-]+\{"
fi

# Use fzf to search citation
# Initial scroll offset is set to the line number of each line
# of git grep output *minus* 5 lines (-5)
# str=$(cat $fn | fzf)

# str=$(git grep -E --line-number $sPattern $bibdFile | fzf --delimiter : --preview 'nl {1} --body-numbering=a' --preview-window=:up:70%:+{2}-5)
str=$(git grep -E --line-number $sPattern $bibdFile | fzf --delimiter : --preview 'less {1}' --preview-window=:up:70%:+{2}-5)


# extract citation key from the fzf string
citeKey=$(echo $str | sed -E "s|$(basename $bibdFile):[0-9]+:@[a-zA-Z]+\{(.+),|\1|")

#method1
#todo: use json with jq
# outCitation=$(pandoc -f latex <(echo "\cite{$citeKey}") -t plain -o - --bibliography $bibdFile --citeproc --csl $cslFile | tail -n +3)

#method2
#need to use a temporary bib file as input to pandoc because parsing a large bib file is too slow, but json input would be faster
#and because pandoc expects a file input for bibliography
tmpName=$(mktemp --suffix=.bib)
str3=$(grep -A 30 $citeKey $bibdFile)
echo $str3 | sed -E "s|(.+\} ?\}).+|\1|" > $tmpName
outCitation=$(pandoc -f latex <(echo "\cite{$citeKey}") -t plain -o - --bibliography $tmpName --citeproc --csl $cslFile | tail -n +3)
rm $tmpName

#tail -n +61 $fn | sed -E "s#(.+\}\})#\1#"
# fzf --preview="head {}" --preview-window=up:30%
# fzf --preview="file {}" --preview-window=down:1
echo $outCitation
echo $outCitation | wl-copy