#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
STYLEGUIDE_REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
SOURCE_CSS="$STYLEGUIDE_REPO_ROOT/styleguide.css"
VERSION_FILE="$STYLEGUIDE_REPO_ROOT/VERSION"

PORTAL_CSS_REL="public/assets/styleguide.upstream.css"
PORTAL_BUILT_CSS_REL="public/assets/styles.css"
PORTAL_META_REL="public/assets/styleguide.upstream.meta.json"
PORTAL_STYLEGUIDE_DOCS_REL="docs/styleguide"
PORTAL_BUILD_SCRIPT_REL="scripts/styleguide/build_styles.sh"
COMMIT_IN_PORTAL="false"

usage() {
  cat <<USAGE
Usage:
  $(basename "$0") [--commit-portal]

Options:
  --commit-portal        Create commit in portal repo after sync.
  -h, --help             Show this help.
USAGE
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    --commit-portal)
      COMMIT_IN_PORTAL="true"
      shift
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    *)
      echo "Unknown argument: $1" >&2
      usage
      exit 1
      ;;
  esac
done

if [[ ! -f "$SOURCE_CSS" ]]; then
  echo "Source CSS not found: $SOURCE_CSS" >&2
  exit 1
fi

if [[ ! -f "$VERSION_FILE" ]]; then
  echo "Version file not found: $VERSION_FILE" >&2
  exit 1
fi

flatten_css() {
  local source_file="$1"
  local source_root="$2"
  local output_file="$3"

  : > "$output_file"
  while IFS= read -r line; do
    if [[ "$line" =~ ^[[:space:]]*@import[[:space:]]+\"([^\"]+)\"[[:space:]]*\;[[:space:]]*$ ]]; then
      local import_path="${BASH_REMATCH[1]}"
      local import_abs="$source_root/$import_path"
      if [[ ! -f "$import_abs" ]]; then
        echo "Imported CSS not found: $import_abs" >&2
        exit 1
      fi
      cat "$import_abs" >> "$output_file"
      printf "\n" >> "$output_file"
    else
      printf "%s\n" "$line" >> "$output_file"
    fi
  done < "$source_file"
}

build_portal_css() {
  local portal_key="$1"
  local source_file="$2"
  local output_file="$3"

  case "$portal_key" in
    vsf)
      awk '
        BEGIN { skip=0 }
        /^:root\[data-portal="naurua"\] \{/ { skip=1; next }
        skip && /^}/ { skip=0; next }
        skip { next }
        { print }
      ' "$source_file" > "$output_file"
      ;;
    naurua)
      awk '
        BEGIN { in_override=0 }
        /^:root\[data-portal="naurua"\] \{/ { print ":root {"; in_override=1; next }
        in_override && /^}/ { print "}"; in_override=0; next }
        { print }
      ' "$source_file" > "$output_file"
      ;;
    *)
      echo "Unknown portal: $portal_key" >&2
      exit 1
      ;;
  esac
}

sync_portal() {
  local portal_key="$1"
  local portal_repo_path="$2"
  local portal_css_path="$portal_repo_path/$PORTAL_CSS_REL"
  local portal_built_css_path="$portal_repo_path/$PORTAL_BUILT_CSS_REL"
  local portal_meta_path="$portal_repo_path/$PORTAL_META_REL"
  local portal_styleguide_docs_path="$portal_repo_path/$PORTAL_STYLEGUIDE_DOCS_REL"
  local portal_build_script_path="$portal_repo_path/$PORTAL_BUILD_SCRIPT_REL"
  local tmp_portal_css

  if [[ ! -d "$portal_repo_path/.git" ]]; then
    echo "Portal repo is not a git repository: $portal_repo_path" >&2
    exit 1
  fi

  mkdir -p "$(dirname "$portal_css_path")"
  mkdir -p "$portal_styleguide_docs_path"

  tmp_portal_css="$(mktemp)"
  build_portal_css "$portal_key" "$TMP_UPSTREAM_CSS" "$tmp_portal_css"
  cp "$tmp_portal_css" "$portal_css_path"
  rm -f "$tmp_portal_css"

  rsync -a --delete \
    --exclude ".git/" \
    --exclude ".codex/" \
    --exclude ".DS_Store" \
    --exclude "AGENTS.md" \
    "$STYLEGUIDE_REPO_ROOT/" \
    "$portal_styleguide_docs_path/"

  STYLEGUIDE_VERSION="$(tr -d '[:space:]' < "$VERSION_FILE")"
  STYLEGUIDE_COMMIT="$(git -C "$STYLEGUIDE_REPO_ROOT" rev-parse --short HEAD)"
  SYNCED_AT="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"

  cat > "$portal_meta_path" <<META
{
  "styleguideVersion": "$STYLEGUIDE_VERSION",
  "styleguideCommit": "$STYLEGUIDE_COMMIT",
  "syncedAtUtc": "$SYNCED_AT",
  "sourceRepo": "$STYLEGUIDE_REPO_ROOT",
  "mirroredDocsPath": "$PORTAL_STYLEGUIDE_DOCS_REL"
}
META

  case "$portal_key" in
    vsf)
      if [[ ! -f "$portal_build_script_path" ]]; then
        echo "Portal build script not found: $portal_build_script_path" >&2
        exit 1
      fi
      bash "$portal_build_script_path"
      ;;
    naurua)
      cp "$portal_css_path" "$portal_built_css_path"
      ;;
  esac

  if [[ "$COMMIT_IN_PORTAL" == "true" ]]; then
    git -C "$portal_repo_path" add -A \
      "$PORTAL_CSS_REL" \
      "$PORTAL_BUILT_CSS_REL" \
      "$PORTAL_META_REL" \
      "$PORTAL_STYLEGUIDE_DOCS_REL"
    if ! git -C "$portal_repo_path" diff --cached --quiet; then
      git -C "$portal_repo_path" commit -m "Sync styleguide $STYLEGUIDE_VERSION"
      git -C "$portal_repo_path" push
      echo "$portal_key portal synced and pushed."
    else
      echo "No changes to commit in $portal_key portal repo."
    fi
  else
    echo "$portal_key portal files updated locally (no commit requested)."
  fi

  echo "Synced $SOURCE_CSS -> $portal_css_path"
  echo "Built portal stylesheet: $portal_built_css_path"
  echo "Metadata written: $portal_meta_path"
  echo "Mirrored styleguide docs: $portal_styleguide_docs_path"
}

assert_no_unimported_styles() {
  local source_file="$1"
  local source_root="$2"
  local styles_dir="$source_root/styles"
  local missing_imports=()

  if [[ ! -d "$styles_dir" ]]; then
    return 0
  fi

  while IFS= read -r css_file; do
    local rel_path="./styles/$(basename "$css_file")"
    if ! grep -Eq "^[[:space:]]*@import[[:space:]]+\"$rel_path\"[[:space:]]*;" "$source_file"; then
      missing_imports+=("$rel_path")
    fi
  done < <(find "$styles_dir" -maxdepth 1 -type f -name '*.css' | sort)

  if [[ ${#missing_imports[@]} -gt 0 ]]; then
    echo "Unimported CSS module files detected in styles/:" >&2
    for file in "${missing_imports[@]}"; do
      echo "  - $file" >&2
    done
    echo "Add missing @import lines in $source_file before syncing." >&2
    exit 1
  fi
}

TMP_UPSTREAM_CSS="$(mktemp)"
trap 'rm -f "$TMP_UPSTREAM_CSS"' EXIT
assert_no_unimported_styles "$SOURCE_CSS" "$STYLEGUIDE_REPO_ROOT"
flatten_css "$SOURCE_CSS" "$STYLEGUIDE_REPO_ROOT" "$TMP_UPSTREAM_CSS"
sync_portal "vsf" "/Users/mathias/Documents/Dokumente Chouchou/Codebases/WebApp_Aktienberater"
sync_portal "naurua" "/Users/mathias/Documents/Dokumente Chouchou/Codebases/erp_naurua"