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"""Starts a local HTTP server which displays layout test failures (given a test
results directory), provides comparisons of expected and actual results (both
images and text) and allows one-click rebaselining of tests."""

from webkitpy.common import system
from webkitpy.common.host import Host
from webkitpy.common.net.resultsjsonparser import for_each_test, JSONTestResult
from webkitpy.layout_tests.layout_package import json_results_generator
from webkitpy.tool.commands.abstractlocalservercommand import AbstractLocalServerCommand
from webkitpy.tool.servers.rebaselineserver import get_test_baselines, RebaselineHTTPServer, STATE_NEEDS_REBASELINE


class TestConfig(object):
    def __init__(self, test_port, layout_tests_directory, results_directory, platforms, scm, host):
        self.test_port = test_port
        self.layout_tests_directory = layout_tests_directory
        self.results_directory = results_directory
        self.platforms = platforms
        self.scm = scm
        self.host = host
        self.filesystem = host.filesystem


class RebaselineServer(AbstractLocalServerCommand):
    name = "rebaseline-server"
    help_text = __doc__
    argument_names = "/path/to/results/directory"

    server = RebaselineHTTPServer

    def _gather_baselines(self, results_json):
        # Rebaseline server and it's associated JavaScript expected the tests subtree to
        # be key-value pairs instead of hierarchical.
        # FIXME: make the rebaseline server use the hierarchical tree.
        new_tests_subtree = {}

        def gather_baselines_for_test(test_name, result_dict):
            result = JSONTestResult(test_name, result_dict)
            if result.did_pass_or_run_as_expected():
                return
            result_dict['state'] = STATE_NEEDS_REBASELINE
            result_dict['baselines'] = get_test_baselines(test_name, self._test_config)
            new_tests_subtree[test_name] = result_dict

        for_each_test(results_json['tests'], gather_baselines_for_test)
        results_json['tests'] = new_tests_subtree

    def _prepare_config(self, options, args, tool):
        results_directory = args[0]
        scm = self._tool.scm()
        host = Host()
        filesystem = host.filesystem

        print('Parsing full_results.json...')
        results_json_path = filesystem.join(results_directory, 'full_results.json')
        results_json = json_results_generator.load_json(filesystem, results_json_path)

        port = tool.port_factory.get()
        layout_tests_directory = port.layout_tests_dir()
        platforms = filesystem.listdir(filesystem.join(layout_tests_directory, 'platform'))
        self._test_config = TestConfig(port, layout_tests_directory, results_directory, platforms, scm, host)

        print('Gathering current baselines...')
        self._gather_baselines(results_json)

        return {
            'test_config': self._test_config,
            "results_json": results_json,
            "platforms_json": {
                'platforms': platforms,
                'defaultPlatform': port.name(),
            },
        }