#!/bin/bash

# omarchy:summary=Play the current background's matching theme intro
# omarchy:hidden=true

set -euo pipefail

state_home="$HOME/.local/state"
current_dir="$state_home/omarchy/current"
current_background_link="$current_dir/background"
marker="$state_home/omarchy/background-intro.session-id"
toggle="$state_home/omarchy/toggles/background-intros-off"
video_extensions=(mp4 m4v mov webm mkv avi)

resolve_intro() {
  local background
  local stem
  local extension
  local intro

  background=$(readlink -f "${1:-$current_background_link}" 2>/dev/null) || return 1
  [[ -f $background ]] || return 1
  case ${background,,} in
  *.jpg | *.jpeg | *.png | *.bmp | *.webp) ;;
  *) return 1 ;;
  esac

  stem=${background##*/}
  stem=${stem%.*}
  for extension in "${video_extensions[@]}"; do
    intro="${background%/*}/intros/$stem.$extension"
    if [[ -f $intro ]]; then
      printf '%s\n' "$intro"
      return 0
    fi
  done
  return 1
}

# Preparation is speculative: the selected staged clip is compared again by OWE.
prepare_theme_intro() {
  local theme="$1" background remembered name source intro
  local -a names=()
  [[ -n $theme && $theme != .* && $theme != */* ]] || return 0
  [[ ! -f $toggle ]] && ! animations_off || return 0
  owe warm >/dev/null 2>&1 || return 0
  [[ $(cat "$current_dir/theme.name" 2>/dev/null) != "$theme" ]] || return 0
  remembered=$(cat "$state_home/omarchy/theme-backgrounds/$theme" 2>/dev/null || true)
  if [[ ${remembered%/*} == "$current_dir/theme/backgrounds" ]]; then
    name=${remembered##*/}
  elif [[ -f $remembered ]]; then
    background="$remembered"
  else
    mapfile -d '' -t names < <(
      find -L "$HOME/.config/omarchy/backgrounds/$theme" -maxdepth 1 -type f -print0 2>/dev/null | sort -z
    )
    if (( ${#names[@]} > 0 )); then
      background=${names[0]}
    else
      mapfile -d '' -t names < <(
        find -L "$OMARCHY_PATH/themes/$theme/backgrounds" "$HOME/.config/omarchy/themes/$theme/backgrounds" -maxdepth 1 -type f \
          \( -iname '*.jpg' -o -iname '*.jpeg' -o -iname '*.png' -o -iname '*.bmp' -o -iname '*.webp' \) -printf '%f\0' 2>/dev/null | sort -zu
      )
      (( ${#names[@]} > 0 )) || return 0
      name=${names[0]}
    fi
  fi
  if [[ -n ${name:-} ]]; then
    for source in "$HOME/.config/omarchy/themes/$theme" "$OMARCHY_PATH/themes/$theme"; do
      if [[ -f $source/backgrounds/$name ]]; then
        background="$source/backgrounds/$name"
        break
      fi
    done
  fi
  [[ -n ${background:-} ]] || return 0
  intro=$(resolve_intro "$background" || true)
  [[ -z $intro ]] || owe intro-prepare "$intro" >/dev/null 2>&1 || true
}

animations_off() {
  [[ $(hyprctl -j getoption animations:enabled 2>/dev/null | jq -r '.bool' 2>/dev/null) == "false" ]]
}

theme_switch=false
intro_prepared=false
expected_background=""
expected_theme=""
case ${1:-} in
  "") ;;
  --prepare-theme)
    prepare_theme_intro "${2:-}"
    exit 0
    ;;
  --resolve-only)
    resolve_intro "${2:-}" || true
    exit 0
    ;;
  --resolve-startup)
    if [[ ! -f $toggle ]] && ! animations_off; then
      resolve_intro || true
    fi
    exit 0
    ;;
  --theme-switch)
    theme_switch=true
    expected_background=$(readlink -f "${2:-}" 2>/dev/null) || exit 1
    expected_theme=${3:-}
    intro_prepared=${4:-false}
    [[ -n $expected_theme ]] || exit 1
    ;;
  *)
    echo "Usage: omarchy-theme-bg-boot-intro [--resolve-only [background]|--resolve-startup|--prepare-theme theme|--theme-switch background theme-id [prepared]]" >&2
    exit 1
    ;;
esac

if [[ $theme_switch == false ]]; then
  mkdir -p "$(dirname "$marker")"
  exec 9>"$state_home/omarchy/background-intro.lock"
  flock 9

  session_id=${OMARCHY_SESSION_ID:-${HYPRLAND_INSTANCE_SIGNATURE:-}}
  [[ -n $session_id ]] || exit 0
  if [[ -f $marker && $(<"$marker") == "$session_id" ]]; then
    exit 0
  fi

  marker_staged=$(mktemp "$state_home/omarchy/.background-intro.session-id.XXXXXX")
  trap 'rm -f "$marker_staged"' EXIT
  printf '%s\n' "$session_id" >"$marker_staged"
  mv -f "$marker_staged" "$marker"
  trap - EXIT
  exec 9>&-
fi

selection_current() {
  [[ $(readlink -f "$current_background_link") == "$expected_background" &&
    $(stat -Lc '%d:%i' "$current_dir/theme" 2>/dev/null) == "$expected_theme" ]]
}

if [[ $theme_switch == true ]] && ! selection_current; then
  exit 0
fi

if [[ -f $toggle ]] || animations_off; then
  [[ $theme_switch == false ]] || exit 1
  exit 0
fi

intro=$(resolve_intro || true)
if [[ -z $intro ]]; then
  [[ $theme_switch == false ]] || exit 1
  exit 0
fi

if [[ $theme_switch == true && $intro_prepared != "true" ]]; then
  owe refresh >/dev/null || exit 1
elif [[ $theme_switch == false ]]; then
  deadline=$((SECONDS + 5))
  while ! timeout 1 owe status >/dev/null 2>&1; do
    if (( SECONDS >= deadline )); then
      exit 0
    fi
    sleep 0.2
  done
  (( SECONDS < deadline )) || exit 0
fi

# The asynchronous outgoing cover must reach the compositor before playback
# can hide the shell background. Older shells have no readiness method.
if [[ $theme_switch == true ]]; then
  deadline=$((SECONDS + 3))
  while true; do
    cover_status=$(omarchy-shell shell themeIntroCoverStatus "$expected_theme" 2>/dev/null || true)
    case $cover_status in
      loading)
        (( SECONDS < deadline )) || exit 1
        sleep 0.01
        ;;
      error) exit 1 ;;
      superseded) exit 0 ;;
      *) break ;;
    esac
  done
fi

if [[ $theme_switch == true ]] && ! selection_current; then
  exit 0
fi

# A selection or setting changed while OWE was starting no longer permits this intro.
if [[ ! -f $toggle && $intro == "$(resolve_intro || true)" ]] && ! animations_off; then
  if [[ $theme_switch == true && $intro_prepared == "true" ]]; then
    owe intro --start first-frame --refresh "$intro"
  else
    owe intro --start first-frame "$intro"
  fi
elif [[ $theme_switch == true ]]; then
  exit 1
fi