#!/bin/bash

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

IMG_INPUT="$SCRIPT_DIR/../assets/images/originals"
VID_INPUT="$SCRIPT_DIR/../assets/videos/originals"

BASE_OUTPUT="$SCRIPT_DIR/../assets"

IMAGE_SIZES=(480 720 1024 1366 1600 1920 2560 3840)
IMAGE_FORMATS=("avif" "webp" "jpeg")

echo "$SCRIPT_DIR"
echo "$BASE_OUTPUT"

# Videonamen (Ordner)
VIDEO_NAMES=(
  "nHD"
  "FWVGA"
  "qHD"
  "HD"
  "HDplus"
  "FullHD"
  "1440p"
  "4K"
)

# Videogrößen (ffmpeg scale)
VIDEO_SCALES=(
  "640:360"
  "854:480"
  "960:540"
  "1280:720"
  "1600:900"
  "1920:1080"
  "2560:1440"
  "3840:2160"
)
VIDEO_FORMATS=("mp4" "webm")

###############################################
# BILDER
###############################################
process_images() {
  echo "🖼️ Starte Bildverarbeitung..."

  for img in "$IMG_INPUT"/*.png; do
    [ -e "$img" ] || continue

    filename=$(basename "$img")
    name="${filename%.*}"

    width=$(magick identify -format "%w" "$img")
    height=$(magick identify -format "%h" "$img")
    orientation="landscape"
    [ "$height" -gt "$width" ] && orientation="portrait"

    echo "Bild: $filename ($orientation)"

    for size in "${IMAGE_SIZES[@]}"; do
      for fmt in "${IMAGE_FORMATS[@]}"; do

        OUT_DIR="$BASE_OUTPUT/images/$size/$fmt"
        mkdir -p "$OUT_DIR"

        OUT_FILE="$OUT_DIR/$name.$fmt"

        if [ -f "$OUT_FILE" ]; then
          echo "⏩ Skip: $name.$fmt existiert bereits ($size)"
          continue
        fi

        if [ "$orientation" = "landscape" ]; then
          magick "$img" -resize "${size}" "$OUT_FILE"
        else
          magick "$img" -resize "x${size}" "$OUT_FILE"
        fi

      done
    done
  done
}

###############################################
# VIDEOS
###############################################
process_videos() {
  echo "🎬 Starte Videobearbeitung..."

  for vid in "$VID_INPUT"/*.mp4; do
    [ -e "$vid" ] || continue

    filename=$(basename "$vid")
    name="${filename%.*}"

    echo "Video: $filename"

    # Original-Auflösung auslesen
    width=$(ffprobe -v error -select_streams v:0 -show_entries stream=width \
            -of csv=p=0 "$vid")
    height=$(ffprobe -v error -select_streams v:0 -show_entries stream=height \
             -of csv=p=0 "$vid")

    # Orientierung bestimmen
    if [ "$width" -gt "$height" ]; then
      orientation="landscape"
    else
      orientation="portrait"
    fi

    echo "➡️  Orientierung erkannt: $orientation (${width}x${height})"

    # über Index 0–7 iterieren
    for i in "${!VIDEO_NAMES[@]}"; do
      res="${VIDEO_NAMES[$i]}"
      scale="${VIDEO_SCALES[$i]}"

      # Scale für Portrait drehen
      if [ "$orientation" = "landscape" ]; then
        target_scale="$scale"
      else
        IFS=':' read -r sw sh <<< "$scale"
        target_scale="${sh}:${sw}"
      fi

      for vfmt in "${VIDEO_FORMATS[@]}"; do

        OUT_DIR="$BASE_OUTPUT/videos/$res/$vfmt"
        mkdir -p "$OUT_DIR"

        OUT_FILE="$OUT_DIR/$name.$vfmt"

        if [ -f "$OUT_FILE" ]; then
          echo "⏩ Skip: $name.$vfmt existiert bereits ($res)"
          continue
        fi

        echo "🎞️  Render: $name.$vfmt → $target_scale ($res)"

        if [ "$vfmt" = "mp4" ]; then
          ffmpeg -y -i "$vid" -vf "scale=$target_scale" \
            -c:v libx264 -crf 23 -preset medium \
            -c:a copy \
            "$OUT_FILE"
        else
          ffmpeg -y -i "$vid" -vf "scale=$target_scale" \
            -c:v libvpx-vp9 -b:v 0 -crf 32 \
            -c:a libopus \
            "$OUT_FILE"
        fi

      done
    done
  done
}


###############################################
echo "----------------------------------------------"
echo " Bratonischer Medien-Konverter gestartet"
echo " Skriptort: $SCRIPT_DIR"
echo "----------------------------------------------"

process_images
process_videos

echo "----------------------------------------------"
echo " Fertig! Nur fehlende Dateien wurden erzeugt."
echo "----------------------------------------------"