# Copyright 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Based on third_party/WebKit/Source/build/scripts/template_expander.py.

import os.path
import sys

_current_dir = os.path.dirname(os.path.realpath(__file__))
# jinja2 is in chromium's third_party directory
# Insert at front to override system libraries, and after path[0] == script dir
sys.path.insert(
    1, os.path.join(_current_dir, *([os.pardir] * 7 + ['third_party'])))
import jinja2


def ApplyTemplate(mojo_generator, path_to_template, params, **kwargs):
  loader = jinja2.ModuleLoader(os.path.join(
      mojo_generator.bytecode_path, "%s.zip" % mojo_generator.GetTemplatePrefix(
      )))
  final_kwargs = dict(mojo_generator.GetJinjaParameters())
  final_kwargs.update(kwargs)
  jinja_env = jinja2.Environment(loader=loader,
                                 keep_trailing_newline=True,
                                 **final_kwargs)
  jinja_env.globals.update(mojo_generator.GetGlobals())
  jinja_env.filters.update(mojo_generator.GetFilters())
  template = jinja_env.get_template(path_to_template)
  return template.render(params)


def UseJinja(path_to_template, **kwargs):
  def RealDecorator(generator):
    def GeneratorInternal(*args, **kwargs2):
      parameters = generator(*args, **kwargs2)
      return ApplyTemplate(args[0], path_to_template, parameters, **kwargs)
    GeneratorInternal.func_name = generator.func_name
    return GeneratorInternal
  return RealDecorator


def PrecompileTemplates(generator_modules, output_dir):
  for module in generator_modules.values():
    generator = module.Generator(None)
    jinja_env = jinja2.Environment(loader=jinja2.FileSystemLoader([os.path.join(
        os.path.dirname(module.__file__), generator.GetTemplatePrefix())]))
    jinja_env.filters.update(generator.GetFilters())
    jinja_env.compile_templates(
        os.path.join(output_dir, "%s.zip" % generator.GetTemplatePrefix()),
        extensions=["tmpl"],
        zip="stored",
        py_compile=True,
        ignore_errors=False)