#!/usr/bin/env python

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.

import os
import re
import subprocess
import sys
import BaseHTTPServer
import SimpleHTTPServer
import SocketServer
import threading
import urlparse

# List of jQuery modules that will be tested.
# TODO(gw): Disabled most of them as something has been
# introduced very recently that causes the resource task
# to panic - and hard fail doesn't exit the servo
# process when this happens.
# See https://github.com/servo/servo/issues/6210 and
#     https://github.com/servo/servo/issues/6211
JQUERY_MODULES = [
    # "ajax",            # panics
    # "attributes",
    # "callbacks",
    # "core",            # mozjs crash
    # "css",
    # "data",
    # "deferred",
    # "dimensions",
    # "effects",
    # "event",           # panics
    # "manipulation",    # mozjs crash
    # "offset",
    # "queue",
    "selector",
    # "serialize",
    # "support",
    # "traversing",
    # "wrap"
]

# Port to run the HTTP server on for jQuery.
TEST_SERVER_PORT = 8192

# A regex for matching console.log output lines from the test runner.
REGEX_PATTERN = "^\[jQuery test\] \[([0-9]+)/([0-9]+)/([0-9]+)] (.*)"


# The result of a single test group.
class TestResult:
    def __init__(self, success, fail, total, text):
        self.success = int(success)
        self.fail = int(fail)
        self.total = int(total)
        self.text = text

    def __key(self):
        return (self.success, self.fail, self.total, self.text)

    def __eq__(self, other):
        return self.__key() == other.__key()

    def __ne__(self, other):
        return self.__key() != other.__key()

    def __hash__(self):
        return hash(self.__key())

    def __repr__(self):
        return "ok={0} fail={1} total={2}".format(self.success, self.fail, self.total)


# Parse a line, producing a TestResult.
# Throws if unable to parse.
def parse_line_to_result(line):
    match = re.match(REGEX_PATTERN, line)
    success, fail, total, name = match.groups()
    return name, TestResult(success, fail, total, line)


# Parse an entire buffer of lines to a dictionary
# of test results, keyed by the test name.
def parse_string_to_results(buffer):
    test_results = {}
    lines = buffer.splitlines()
    for line in lines:
        name, test_result = parse_line_to_result(line)
        test_results[name] = test_result
    return test_results


# Run servo and print / parse the results for a specific jQuery test module.
def run_servo(servo_exe, module):
    url = "http://localhost:{0}/jquery/test/?module={1}".format(TEST_SERVER_PORT, module)
    args = [servo_exe, url, "-z", "-f"]
    proc = subprocess.Popen(args, stdout=subprocess.PIPE)
    while True:
        line = proc.stdout.readline()
        if len(line) == 0:
            break
        line = line.rstrip()
        try:
            name, test_result = parse_line_to_result(line)
            yield name, test_result
        except AttributeError:
            pass


# Build the filename for an expected results file.
def module_filename(module):
    return 'expected_{0}.txt'.format(module)


# Read an existing set of expected results to compare against.
def read_existing_results(module):
    with open(module_filename(module), 'r') as file:
        buffer = file.read()
        return parse_string_to_results(buffer)


# Write a set of results to file
def write_results(module, results):
    with open(module_filename(module), 'w') as file:
        for result in test_results.itervalues():
            file.write(result.text + '\n')


# Print usage if command line args are incorrect
def print_usage():
    print("USAGE: {0} test|update servo_binary jquery_base_dir".format(sys.argv[0]))


# Run a simple HTTP server to serve up the jQuery test suite
def run_http_server():
    class ThreadingSimpleServer(SocketServer.ThreadingMixIn,
                                BaseHTTPServer.HTTPServer):
        allow_reuse_address = True

    class RequestHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
        # TODO(gw): HACK copy the fixed version from python
        # main repo - due to https://bugs.python.org/issue23112
        def send_head(self):
            path = self.translate_path(self.path)
            f = None
            if os.path.isdir(path):
                parts = urlparse.urlsplit(self.path)
                if not parts.path.endswith('/'):
                    # redirect browser - doing basically what apache does
                    self.send_response(301)
                    new_parts = (parts[0], parts[1], parts[2] + '/',
                                 parts[3], parts[4])
                    new_url = urlparse.urlunsplit(new_parts)
                    self.send_header("Location", new_url)
                    self.end_headers()
                    return None
                for index in "index.html", "index.htm":
                    index = os.path.join(path, index)
                    if os.path.exists(index):
                        path = index
                        break
                else:
                    return self.list_directory(path)
            ctype = self.guess_type(path)
            try:
                # Always read in binary mode. Opening files in text mode may cause
                # newline translations, making the actual size of the content
                # transmitted *less* than the content-length!
                f = open(path, 'rb')
            except IOError:
                self.send_error(404, "File not found")
                return None
            try:
                self.send_response(200)
                self.send_header("Content-type", ctype)
                fs = os.fstat(f.fileno())
                self.send_header("Content-Length", str(fs[6]))
                self.send_header("Last-Modified", self.date_time_string(fs.st_mtime))
                self.end_headers()
                return f
            except:
                f.close()
                raise

        def log_message(self, format, *args):
            return

    server = ThreadingSimpleServer(('', TEST_SERVER_PORT), RequestHandler)
    while True:
        sys.stdout.flush()
        server.handle_request()

if __name__ == '__main__':
    if len(sys.argv) == 4:
        cmd = sys.argv[1]
        servo_exe = sys.argv[2]
        base_dir = sys.argv[3]
        os.chdir(base_dir)

        # Ensure servo binary can be found
        if not os.path.isfile(servo_exe):
            print("Unable to find {0}. This script expects an existing build of Servo.".format(servo_exe))
            sys.exit(1)

        # Start the test server
        httpd_thread = threading.Thread(target=run_http_server)
        httpd_thread.setDaemon(True)
        httpd_thread.start()

        if cmd == "test":
            print("Testing jQuery on Servo!")
            test_count = 0
            unexpected_count = 0

            individual_success = 0
            individual_total = 0

            # Test each module separately
            for module in JQUERY_MODULES:
                print("\t{0}".format(module))

                prev_test_results = read_existing_results(module)
                for name, current_result in run_servo(servo_exe, module):
                    test_count += 1
                    individual_success += current_result.success
                    individual_total += current_result.total

                    # If this test was in the previous results, compare them.
                    if name in prev_test_results:
                        prev_result = prev_test_results[name]
                        if prev_result == current_result:
                            print("\t\tOK: {0}".format(name))
                        else:
                            unexpected_count += 1
                            print("\t\tFAIL: {0}: WAS {1} NOW {2}".format(name, prev_result, current_result))
                        del prev_test_results[name]
                    else:
                        # There was a new test that wasn't expected
                        unexpected_count += 1
                        print("\t\tNEW: {0}".format(current_result.text))

                # Check what's left over, these are tests that were expected but didn't run this time.
                for name in prev_test_results:
                    test_count += 1
                    unexpected_count += 1
                    print("\t\tMISSING: {0}".format(prev_test_results[name].text))

            print("\tRan {0} test groups. {1} unexpected results.".format(test_count, unexpected_count))
            print("\t{0} tests succeeded of {1} ({2:.2f}%)".format(individual_success,
                                                                   individual_total,
                                                                   100.0 * individual_success / individual_total))
            if unexpected_count > 0:
                sys.exit(1)
        elif cmd == "update":
            print("Updating jQuery expected results")
            for module in JQUERY_MODULES:
                print("\t{0}".format(module))
                test_results = {}
                for name, test_result in run_servo(servo_exe, module):
                    print("\t\t{0} {1}".format(name, test_result))
                    test_results[name] = test_result
                write_results(module, test_results)
        else:
            print_usage()
    else:
        print_usage()
