# Copyright 2026 Google LLC
#
# Licensed 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.

import json
import os
import shutil
import subprocess
import tempfile
from pathlib import Path

import jsonschema
import yaml

from .utils import TerraformExample, YamlExample

BASE_PATH = Path(__file__).parent


def prepare_files(example, test_path, files, fixtures):
  if files is not None:
    requested_files = files.split(',')
    for f in requested_files:
      destination = test_path / example.files[f].path
      destination.parent.mkdir(parents=True, exist_ok=True)
      destination.write_text(example.files[f].content)

  if fixtures is not None:
    requested_fixtures = fixtures.split(',')
    for f in requested_fixtures:
      if f.startswith('fixtures/'):
        # fixture is specified referencing a global fixture in (tests/fixtures/)
        source = BASE_PATH.parent / f
        destination = test_path / source.name
        destination.symlink_to(source)
      else:
        # fixture is specified using an inline tftest-fixture tag
        destination = test_path / f'{f}.tf'
        destination.write_text(example.fixtures[f])


def _test_terraform_example(plan_validator, example):
  directive = example.directive

  # for tfvars-based tests, create the temporary directory with the
  # same parent as the original module
  directory = example.module.parent if example.type == 'tfvars' else None
  prefix = f'pytest-{example.module.name}'
  with tempfile.TemporaryDirectory(prefix=prefix, dir=directory) as tmp_path:
    tmp_path = Path(tmp_path)
    tf_var_files = []
    if example.type == 'hcl':
      (tmp_path / 'fabric').symlink_to(BASE_PATH.parents[1])
      (tmp_path / 'variables.tf').symlink_to(BASE_PATH / 'variables.tf')
      (tmp_path / 'main.tf').write_text(example.code)
      assets_path = (BASE_PATH.parent / str(example.module).replace('-', '_') /
                     'assets')
      if assets_path.exists():
        (tmp_path / 'assets').symlink_to(assets_path)

      prepare_files(example, tmp_path, directive.kwargs.get('files'),
                    directive.kwargs.get('fixtures'))
    elif example.type == 'tfvars':
      (tmp_path / 'terraform.auto.tfvars').write_text(example.code)

      def ignore_missing(src, names):
        return [n for n in names if not (Path(src) / n).exists()]

      shutil.copytree(example.module, tmp_path, dirs_exist_ok=True,
                      ignore=ignore_missing)
      tf_var_files = [(tmp_path / 'terraform.auto.tfvars').resolve()]

    inventory = []
    if directive.kwargs.get('inventory') is not None:
      python_test_path = str(example.module).replace('-', '_')
      inventory = BASE_PATH.parent / python_test_path / 'examples'
      inventory = inventory / directive.kwargs['inventory']

    try:
      summary = plan_validator(module_path=tmp_path, inventory_paths=inventory,
                               tf_var_files=tf_var_files)
    except AssertionError:
      repo_root = BASE_PATH.parents[1]
      readme_rel = example.readme_path.relative_to(repo_root)
      index_arg = f" --index {example.index}" if example.index > 1 else ""
      print(
          f'To regenerate inventory run:\nuv run tools/generate_plan_summary.py '
          f'{readme_rel} "{example.header}"{index_arg} --save')
      raise

    print('\n')
    print(yaml.dump({'values': summary.values}))
    print(yaml.dump({'counts': summary.counts}))
    print(yaml.dump({'outputs': summary.outputs}))

    counts = summary.counts
    num_modules, num_resources = counts['modules'], counts['resources']

    if expected_modules := directive.kwargs.get('modules'):
      expected_modules = int(expected_modules)
      assert expected_modules == num_modules, 'wrong number of modules'
    if expected_resources := directive.kwargs.get('resources'):
      expected_resources = int(expected_resources)
      assert expected_resources == num_resources, 'wrong number of resources'

    # TODO(jccb): this should probably be done in check_documentation
    # but we already have all the data here.
    binary = os.environ.get('TERRAFORM', 'terraform')
    result = subprocess.run(
        f'{binary} fmt -check -diff -no-color main.tf'.split(), cwd=tmp_path,
        stdout=subprocess.PIPE, encoding='utf-8')
    assert result.returncode == 0, f'[{example.name}] terraform example code in README.md not formatted correctly\n{result.stdout}'


def _test_yaml_example(example):
  yaml_object = yaml.safe_load(example.body)
  schema = json.load(example.schema.open())
  jsonschema.validate(instance=yaml_object, schema=schema)


def test_example(plan_validator, example):
  match example:
    case TerraformExample():
      _test_terraform_example(plan_validator, example)
    case YamlExample():
      _test_yaml_example(example)