#!/bin/bash

# -------------------------------------------------------------------------------------- #
#           )                                                   (                        #
#        ( /(   (  (               )    (       (  (  (         )\ )    (  (             #
#        )\()) ))\ )(   (         (     )\ )    )\))( )\  (    (()/( (  )\))(  (         #
#       ((_)\ /((_|()\  )\ )      )\  '(()/(   ((_)()((_) )\ )  ((_)))\((_)()\ )\        #
#       | |(_|_))( ((_)_(_/(    _((_))  )(_))  _(()((_|_)_(_/(  _| |((_)(()((_|(_)       #
#       | '_ \ || | '_| ' \))  | '  \()| || |  \ V  V / | ' \)) _` / _ \ V  V (_-<       #
#       |_.__/\_,_|_| |_||_|   |_|_|_|  \_, |   \_/\_/|_|_||_|\__,_\___/\_/\_//__/       #
#                                  |__/                                                  #
#                        Copyright (c) 2021 Simon Schneegans                             #
#           Released under the GPLv3 or later. See LICENSE file for details.             #
# -------------------------------------------------------------------------------------- #

# Exit the script when one command fails.
set -e

# Go to the script's directory.
cd "$( cd "$( dirname "$0" )" && pwd )" || \
  { echo "ERROR: Could not find kwin directory."; exit 1; }

BUILD_DIR="_build"

mkdir -p "$BUILD_DIR"

# $1: The nick of the effect (e.g. "energize-a")
# $2: The name of the effect (e.g. "Energize A")
# $3: A short description of the effect (e.g. "Beam your windows away")
generate() {

  # Use the nick for the effect's directory name by replacing dashes by underscoares.
  DIR_NAME="kwin4_effect_$(echo "$1" | tr '-' '_')"

  # Transform to CamelCase for the JavaScript class.
  EFFECT_CLASS="BurnMyWindows$(sed -r 's/(^|-)(\w)/\U\2/g' <<<"$1")Effect"

  # Create resource directories.
  mkdir -p "$BUILD_DIR/$DIR_NAME/contents/shaders"
  mkdir -p "$BUILD_DIR/$DIR_NAME/contents/code"
  mkdir -p "$BUILD_DIR/$DIR_NAME/contents/config"
  mkdir -p "$BUILD_DIR/$DIR_NAME/contents/ui"

  # Copy the config file if it exists.
  if [ -f "$1/main.xml" ]; then
    cp "$1/main.xml" "$BUILD_DIR/$DIR_NAME/contents/config"
  fi

  # Copy the ui file if it exists.
  if [ -f "$1/config.ui" ]; then
    cp "$1/config.ui" "$BUILD_DIR/$DIR_NAME/contents/ui"
  fi


  ON_SETTINGS_CHANGE=""
  ON_ANIMATION_BEGIN=""

  if [ -f "$1/onSettingsChanged.js" ]; then
    ON_SETTINGS_CHANGE=$(tr '/' '\f' < "$1/onSettingsChanged.js")
  fi

  if [ -f "$1/onAnimationBegin.js" ]; then
    ON_ANIMATION_BEGIN=$(tr '/' '\f' < "$1/onAnimationBegin.js")
  fi

  cp main.js.in "$BUILD_DIR/$DIR_NAME/contents/code/main.js"
  perl -pi -e "s/%ON_SETTINGS_CHANGE%/$ON_SETTINGS_CHANGE/g;" "$BUILD_DIR/$DIR_NAME/contents/code/main.js"
  perl -pi -e "s/%ON_ANIMATION_BEGIN%/$ON_ANIMATION_BEGIN/g;" "$BUILD_DIR/$DIR_NAME/contents/code/main.js"
  perl -pi -e "s/%EFFECT_CLASS%/$EFFECT_CLASS/g;"             "$BUILD_DIR/$DIR_NAME/contents/code/main.js"
  perl -pi -e "s/%SHADER_NAME%/$1/g;"                         "$BUILD_DIR/$DIR_NAME/contents/code/main.js"
  perl -pi -e "s/\f/\//g;"                                    "$BUILD_DIR/$DIR_NAME/contents/code/main.js"

  cp metadata.desktop.in "$BUILD_DIR/$DIR_NAME/metadata.desktop"
  perl -pi -e "s/%ICON%/$1/g;"            "$BUILD_DIR/$DIR_NAME/metadata.desktop"
  perl -pi -e "s/%NAME%/$2/g;"            "$BUILD_DIR/$DIR_NAME/metadata.desktop"
  perl -pi -e "s/%DESCRIPTION%/$3/g;"     "$BUILD_DIR/$DIR_NAME/metadata.desktop"
  perl -pi -e "s/%DIR_NAME%/$DIR_NAME/g;" "$BUILD_DIR/$DIR_NAME/metadata.desktop"

  {
    echo "#version 140"
    echo "#define KWIN"
    echo ""
    echo "// This file is automatically generated during the build process."
    echo ""
    cat "../resources/shaders/common.glsl"
    cat "../resources/shaders/$1.frag"
  } > "$BUILD_DIR/$DIR_NAME/contents/shaders/$1_core.frag"

  {
    echo "#define KWIN_LEGACY"
    echo ""
    echo "// This file is automatically generated during the build process."
    echo ""
    cat "../resources/shaders/common.glsl"
    cat "../resources/shaders/$1.frag"
  } > "$BUILD_DIR/$DIR_NAME/contents/shaders/$1.frag"

  # If clang-format is installed, try to beauty the code a bit.
  if command -v clang-format &> /dev/null
  then
      clang-format -i "$BUILD_DIR/$DIR_NAME/contents/code/main.js"
  fi

  # Create an archive for the effect.
  tar -C "$BUILD_DIR" -czf "$DIR_NAME.tar.gz" "$DIR_NAME"
}

generate "apparition" "Apparition [BMW]" "This effect hides your windows by violently sucking them into the void of magic"
generate "energize-a" "Energize A [BMW]" "Beam your windows away"
generate "energize-b" "Energize B [BMW]" "Using different transporter technology results in an alternative visual effect"
generate "hexagon"    "Hexagon [BMW]"    "With glowing lines and hexagon-shaped tiles, this effect looks very sci-fi"
generate "tv"         "TV Effect [BMW]"  "Make windows close like turning off a TV"
generate "wisps"      "Wisps [BMW]"      "Let your windows be carried away to the realm of dreams by these little fairies"
# generate "fire" "Fire" "Make windows burn"