#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2014 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.

import argparse
import os
import re
import subprocess
import sys

SKY_TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))
SKY_ROOT = os.path.dirname(SKY_TOOLS_DIR)
SRC_ROOT = os.path.dirname(SKY_ROOT)

WORKBENCH = os.path.join(SRC_ROOT, 'sky', 'packages', 'workbench')
DART_SDK = os.path.join(SRC_ROOT, 'third_party', 'dart-sdk', 'dart-sdk', 'bin')
DARTANALYZER = os.path.join(DART_SDK, 'dartanalyzer')
SKY_UNIT_TESTS = os.path.join(SKY_ROOT, 'unit', 'test')

_IGNORED_PATTERNS = [
  # Ignored because they're not indicative of specific errors.
  re.compile(r'^$'),
  re.compile(r'^Analyzing \['),
  re.compile(r'^No issues found'),
  re.compile(r'^[0-9]+ (error|warning|hint).*found[.]'),

  # Disable the Strong checks that we don't care about.
  re.compile(r'^\[error\] Invalid override\. The type of [^ ]+ \(.+\) is not a subtype of [^ ]+ \(.+\)\.'), # we allow type narrowing
  re.compile(r'^\[(warning|hint)\] .+ will need runtime check to cast to type .+'), # https://github.com/dart-lang/sdk/issues/24542
  re.compile(r'^\[hint\] .+ requires dynamic invoke'), # too many false positives, e.g. https://github.com/dart-lang/sdk/issues/24564
  re.compile(r'^\[hint\] Runtime check on non-ground type .+ may throw StrongModeError'), # https://github.com/dart-lang/sdk/issues/24565
  re.compile(r'^\[hint] \([_, ]+\) .+ has inferred type '), # ignore underscore-only arguments
  re.compile(r'^\[error\] Type check failed: .*\(dynamic\) is not of type'), # allow unchecked casts from dynamic

  # Disable the lint checks that will be caught by code review
  re.compile(r'^\[lint\] Avoid defining a one-member abstract class when a simple function will do'),
  re.compile(r'^\[lint\] Prefer using lowerCamelCase for constant names.'),
  re.compile(r'^\[lint\] Name non-constant identifiers using lowerCamelCase.'),

  # TODO: Fix all the warnings in the mojo packages
  re.compile(r'.*pub-cache.*\.mojom\.dart'),

  # It'd be nice if the other packages we used didn't have warnings, too...
  re.compile(r'.*pub-cache/hosted/pub.dartlang.org/'),
]

def main():
    parser = argparse.ArgumentParser(description='Sky Analyzer')
    parser.add_argument('--congratulate', action="store_true")
    parser.add_argument('app_path', type=str, nargs="?")
    args = parser.parse_args()

    if args.app_path is not None:
        app_paths = [args.app_path]
    else:
        # If no app_path is provided, then run the analyzer on any Dart file
        # within the unit tests.
        app_paths = []
        for root, _, files in os.walk(SKY_UNIT_TESTS):
            app_paths.extend(os.path.join(root, f)
                             for f in files if f.endswith(".dart"))

    try:
      subprocess.check_output([
          DARTANALYZER, "--package-warnings",
          "--package-root", os.path.join(WORKBENCH, "packages"),
          "--ignore-unrecognized-flags",
          "--fatal-hints",
          "--fatal-warnings",
          "--lints",
          "--strong",
          "--strong-hints",
          "--enable-strict-call-checks",
          "--enable_type_checks",
          "--supermixin",
      ] + app_paths, stderr=subprocess.STDOUT)
    except subprocess.CalledProcessError as e:
      errors = [l for l in e.output.split('\n')
                if not any(p.match(l) for p in _IGNORED_PATTERNS)]
      if len(errors) > 0:
        for error in errors:
          print >> sys.stderr, error
        # Propagate analyzer error code.
        return e.returncode
    # If we do not have any errors left after filtering, return 0.
    if args.congratulate:
      print >> sys.stdout, "No analyzer warnings!"
    return 0

if __name__ == '__main__':
    sys.exit(main())