#!/usr/bin/env bash

# fzf_preview_mine

file="$1"

center() {
    local text="$1"
    local width="$FZF_PREVIEW_COLUMNS"
    local len=${#text}
    local pad=$(( (width - len) / 2 ))
    [[ $pad -lt 0 ]] && pad=0
    printf "%*s%s\n" "$pad" "" "$text"
}

generic() {
    fold -s -w "$FZF_PREVIEW_COLUMNS" "$1" | head -n 2500
} 

# echo centered extension or filename (if there is no extension)
base="${file##*/}"
if [[ "$base" == *.* && "$base" != .* ]]; then
    ext="${base##*.}"
else
    ext="$base"
fi
center "$ext"


mime=$(file --mime-type -b "$file" 2>/dev/null)
encoding=$(file --mime-encoding -b "$file" 2>/dev/null)
debug="0"

tmp=$(mktemp -d)
cleanup() {
    pkill -P $$
    sleep 0.1
    rm -rf "$tmp"
}
trap cleanup EXIT


chafaView () {
    clear
    local file width_px height_px
    width_px="$((FZF_PREVIEW_COLUMNS))"
    height_px="$((FZF_PREVIEW_LINES))"
    file="$1"
    chafa --dither=diffusion -f sixels -s "${width_px}x${height_px}" "$file" 2>/dev/null
    echo
}

if [[ $mime == image/* ]]; then
    (( debug )) && echo "image"

    if [[ "$file" == *.psd ]] || [[ "$file" = *.avif ]]; then
        convert "$file" -flatten "$tmp/tmp.png"
        file="$tmp/tmp.png"
    fi
    if [[ "$file" == *.svg ]]; then
        inkscape "$file" --actions="export-filename:$tmp/tmp.png; export-do" 2> /dev/null
        file="$tmp/tmp.png"
    fi
    chafaView "$file" || generic "$file"

elif [[ $mime == audio/* ]] || [[ "${file,,}" == *.m4a ]] || [[ "${file,,}" == *.mp3 ]]; then
    mediainfo "$file" 2> /dev/null
    mpv --no-video --quiet "$file" 2> /dev/null

elif [[ $mime == video/* ]] || [[ "${file,,}" == *.mxf ]]; then
    (( debug )) && echo "video"
    dur=$(ffprobe -v panic -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$file")
    [[ -z "$dur" || "$dur" == "N/A" ]] && dur=50
    halfdur=$(bc -l <<< "$dur / 2.00")

    ffmpeg -hide_banner -loglevel panic -ss "$halfdur" -i "$file" -frames:v 1 "$tmp/middle.png" -y

    chafaView "$tmp/middle.png"

elif [[ "$file" == *.epub ]]; then
    {
        epub2txt -a -n "$file" 2>/dev/null ||
        pandoc "$file" -t plain 2>/dev/null
    } | fold -s -w "$FZF_PREVIEW_COLUMNS"

elif [[ "$file" == *.mobi ]]; then
    ebook-convert "$file" "$tmp/tmp.txt" 2>/dev/null
    clear
    fold -s -w "$FZF_PREVIEW_COLUMNS" "$tmp/tmp.txt"

elif [[ "$file" == *.html ]] || [[ "$file" == *.htm ]]; then
    w3m -o display_link_number=1 -dump -cols "$FZF_PREVIEW_COLUMNS" "$file" || generic "$file"

elif [[ "$mime" == application/pdf ]]; then
    # graphical, show 1st page only
    pdftocairo -png -scale-to 1200 -singlefile "$file" "$tmp/out"
    chafaView "$tmp/out.png"  

    # textual, extract all text
    pdftotext -layout "$file" - 2>/dev/null \
    | fold -s -w "$FZF_PREVIEW_COLUMNS"

    # use shift + up/down to switch between two previews

# atool for compressed stuff
elif [[ "$file" == *.zip ]] || [[ "$file" == *.tar* ]] || [[ "$file" == *.7z ]] || [[ "$file" == *.rar ]]; then
    als -l "$file" 2>/dev/null | head -n 500

elif [[ "$file" == *.deb ]]; then
    dpkg-deb --contents "$file"

# fonts
elif [[ "$file" == *.otf ]] || [[ "$file" == *.ttf ]] || [[ "$file" == *.woff ]]; then

    name="${file##*/}"      # fira.ttf
    name="${name%.*}"       # fira
    name="${name^^}"        # FIRA

convert -size 1600x800 xc:black \
  -font "$file" \
  -fill white \
  -gravity northwest \
  \
  -pointsize 120 \
  -annotate +40+80 "${name}" \
  \
  -pointsize 60 \
  -annotate +40+320 "The quick brown čšž ČŠŽ\njumps over the lazy dog\n\nIN RHONCUS NULLA VEL ANTE,\nQUIS BLANDIT TURPIS SAGITTIS.\nSED SODALES, JUSTO AC PLACERAT." \
  \
  "$tmp/font.png"

    #open "$tmp/font.png"
    chafaView "$tmp/font.png"

elif [[ $encoding == binary ]]; then
    echo "[BINARY: $(basename "$file")]"
    xxd "$file" | head -100 || strings "$file" | head -300

else

    generic "$file"

fi