#!/bin/bash -eu

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -e

# Check if --force flag is provided
FORCE_BUILD=false
if [[ "$@" == *"--force"* ]]; then
  FORCE_BUILD=true
fi

# Function to check if a file is newer than another
is_newer_than() {
  # Returns 0 (true) if $1 is newer than $2, 1 (false) otherwise
  if [ ! -f "$2" ]; then
    return 0  # If target doesn't exist, we need to build
  fi
  if [ ! -f "$1" ]; then
    return 1  # If source doesn't exist, we can't build (will error later)
  fi
  [ "$1" -nt "$2" ]
}

SQL_DOCS_OUTPUT="lib/sql-docs.ts"
SQL_DOCS_SCRIPT="script/create-sql-docs.mjs"
SQL_DOCS_FILELIST="script/sql-doc-files.txt"

BUILD_SQL_DOCS=false

if [ "$FORCE_BUILD" = true ] || [ ! -f "$SQL_DOCS_OUTPUT" ]; then
  BUILD_SQL_DOCS=true
else
  # Check if create-sql-docs.mjs is newer than output
  if is_newer_than "$SQL_DOCS_SCRIPT" "$SQL_DOCS_OUTPUT"; then
    BUILD_SQL_DOCS=true
  fi

  # Check if sql-doc-files.txt is newer than output
  if is_newer_than "$SQL_DOCS_FILELIST" "$SQL_DOCS_OUTPUT"; then
    BUILD_SQL_DOCS=true
  fi

  # Check if any file listed in sql-doc-files.txt is newer than output
  if [ -f "$SQL_DOCS_FILELIST" ] && [ "$BUILD_SQL_DOCS" = false ]; then
    while read -r file; do
      # Skip empty lines and comments
      if [[ -z "$file" ]] || [[ "$file" =~ ^[[:space:]]*# ]]; then
        continue
      fi
      if [ -n "$file" ] && is_newer_than "$file" "$SQL_DOCS_OUTPUT"; then
        BUILD_SQL_DOCS=true
        break
      fi
    done < "$SQL_DOCS_FILELIST"
  fi
fi

if [ "$BUILD_SQL_DOCS" = true ]; then
  echo "Compiling SQL function docs for the web console..."
  ./script/create-sql-docs.mjs
else
  echo "SQL docs are up to date, skipping..."
fi