"""
Module holds all stuff regarding Grinder tool usage

Copyright 2015 BlazeMeter Inc.

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 os
import re
import time

from bzt import TaurusConfigError, ToolError
from bzt.engine import ScenarioExecutor, FileLister, HavingInstallableTools, SelfDiagnosable
from bzt.modules.aggregator import ConsolidatingAggregator, ResultsReader
from bzt.modules.console import WidgetProvider, ExecutorWidget
from bzt.modules.java import TaurusJavaHelper
from bzt.requests_model import HTTPRequest
from bzt.six import iteritems
from bzt.utils import MirrorsManager, dehumanize_time, get_full_path, PythonGenerator, CALL_PROBLEMS
from bzt.utils import unzip, RequiredTool, JavaVM, shutdown_process, TclLibrary, FileReader, RESOURCES_DIR


class GrinderExecutor(ScenarioExecutor, WidgetProvider, FileLister, HavingInstallableTools, SelfDiagnosable):
    """
    Grinder executor module
    """
    def __init__(self):
        super(GrinderExecutor, self).__init__()
        self.script = None
        self.exec_id = "grinder-bzt-%s" % id(self)
        self.properties_file = None
        self.kpi_file = None
        self.cmd_line = None
        self.process = None
        self.end_time = None
        self.retcode = None
        self.java_helper = None

    def __write_base_props(self, fds):
        """
        write base properties and base properties file contents to fds
        :param fds: fds
        :return:
        """
        base_props_file = self.settings.get("properties-file")
        if base_props_file:
            fds.write("# Base Properies File Start: %s\n" % base_props_file)
            with open(base_props_file) as bpf:
                fds.write(bpf.read())
            fds.write("# Base Properies File End: %s\n\n" % base_props_file)

        # base props
        base_props = self.settings.get("properties")
        if base_props:
            fds.write("# Base Properies Start\n")
            for key, val in iteritems(base_props):
                fds.write("%s=%s\n" % (key, val))
            fds.write("# Base Properies End\n\n")

    def __write_scenario_props(self, fds, scenario):
        """
        Write scenario props and scenario file props to fds
        :param fds:
        :param scenario: dict
        :return:
        """
        script_props_file = scenario.get("properties-file")
        if script_props_file:
            fds.write("# Script Properies File Start: %s\n" % script_props_file)
            with open(script_props_file) as spf:
                fds.write(spf.read())
            fds.write("# Script Properies File End: %s\n\n" % script_props_file)

        # scenario props
        local_props = scenario.get("properties")
        if local_props:
            fds.write("# Scenario Properies Start\n")
            for key, val in iteritems(local_props):
                fds.write("%s=%s\n" % (key, val))
            fds.write("# Scenario Properies End\n\n")

    def __write_bzt_props(self, fds):
        """
        Write bzt properties to fds
        :param fds:
        :return:
        """
        fds.write("# BZT Properies Start\n")
        fds.write("grinder.hostID=%s\n" % self.exec_id)
        fds.write("grinder.script=%s\n" % self.script.replace(os.path.sep, "/"))
        fds.write("grinder.logDirectory=%s\n" % self.engine.artifacts_dir.replace(os.path.sep, "/"))

        load = self.get_load()

        if load.iterations or load.concurrency:
            fds.write("grinder.runs=%s\n" % load.iterations or 0)

        if load.concurrency:
            fds.write("grinder.threads=%s\n" % load.concurrency)

        if load.duration:
            fds.write("grinder.duration=%s\n" % int(load.duration * 1000))

        fds.write("# taurus load values in case you need them\n")
        fds.write("taurus.concurrency=%s\n" % load.concurrency)
        fds.write("taurus.throughput=%s\n" % load.throughput)
        fds.write("taurus.ramp_up=%s\n" % load.ramp_up)
        fds.write("taurus.steps=%s\n" % load.steps)
        fds.write("taurus.hold_for=%s\n" % load.hold)
        fds.write("taurus.iterations=%s\n" % load.iterations)
        fds.write("# BZT Properies End\n")

    def prepare(self):
        self.stdout = open(self.engine.create_artifact("grinder", ".out"), "w")
        self.stderr = open(self.engine.create_artifact("grinder", ".err"), "w")

        self.install_required_tools()
        scenario = self.get_scenario()
        self.exec_id = self.label
        self.script = self.get_script_path()
        if not self.script:
            if "requests" in scenario:
                self.script = self.__scenario_from_requests()
            else:
                msg = "There must be a script file or requests for its generation "
                msg += "to run Grinder tool (%s)" % self.execution.get('scenario')
                raise TaurusConfigError(msg)

        self.properties_file = self.engine.create_artifact("grinder", ".properties")

        with open(self.properties_file, 'w') as fds:
            self.__write_base_props(fds)
            self.__write_scenario_props(fds, scenario)
            self.__write_bzt_props(fds)

        self.kpi_file = os.path.join(self.engine.artifacts_dir, self.exec_id + "-kpi.log")

        self.reader = DataLogReader(self.kpi_file, self.log)
        self.reader.report_by_url = self.settings.get("report-by-url", False)
        if isinstance(self.engine.aggregator, ConsolidatingAggregator):
            self.engine.aggregator.add_underling(self.reader)

        # add logback configurations used by worker processes (logback-worker.xml)
        self.env.add_path({"CLASSPATH": RESOURCES_DIR}, finish=True)
        self.env.add_path({"CLASSPATH": self.java_helper.tool_path}, finish=True)
        self.env.add_path({"CLASSPATH": self.settings.get("path", None)}, finish=True)

        self.cmd_line = ["java", "net.grinder.Grinder", self.properties_file]

    def startup(self):
        """
        Should start the tool as fast as possible.
        """
        self.env.set({"T_GRINDER_PREFIX": self.exec_id})
        self.process = self.execute(self.cmd_line)

    def check(self):
        """
        Checks if tool is still running. Also checks if resulting logs contains
        any data and throws exception otherwise.

        :return: bool
        :raise TaurusToolError:
        """
        self.retcode = self.process.poll()
        if self.retcode is not None:
            if self.retcode != 0:
                raise ToolError("Gatling tool exited with non-zero code: %s" % self.retcode,
                                self.get_error_diagnostics())

            return True
        return False

    def shutdown(self):
        """
        If tool is still running - let's stop it.
        """
        shutdown_process(self.process, self.log)
        if self.start_time:
            self.end_time = time.time()
            self.log.debug("Grinder worked for %s seconds", self.end_time - self.start_time)

    def post_process(self):
        """
        Collect data file artifact
        """
        if self.kpi_file:
            self.engine.existing_artifact(self.kpi_file)
        super(GrinderExecutor, self).post_process()

    def __scenario_from_requests(self):
        """
        Generate grinder scenario from requests
        :return: script
        """
        script = self.engine.create_artifact("grinder_requests", ".py")
        builder = GrinderScriptBuilder(self.get_scenario(), self.log)
        builder.label = self.label
        builder.build_source_code()
        builder.save(script)
        return script

    def install_required_tools(self):
        grinder = self._get_tool(Grinder, config=self.settings)
        self.settings["path"] = grinder.tool_path

        self.java_helper = self._get_tool(TaurusJavaHelper)

        required_tools = [self._get_tool(TclLibrary),
                          self._get_tool(JavaVM),
                          self.java_helper,
                          grinder]

        for tool in required_tools:
            if not tool.check_if_installed():
                tool.install()

    def get_widget(self):
        if not self.widget:
            if self.script is not None:
                label = "Grinder: %s" % os.path.basename(self.script)
            else:
                label = None
            self.widget = ExecutorWidget(self, label)
            if self.get_load().ramp_up:
                self.widget.duration += self.get_load().ramp_up  # because we have ramp-down equal to rampup
        return self.widget

    def resource_files(self):
        resource_files = []
        script_file_path = self.get_script_path()
        if script_file_path:
            resource_files.append(script_file_path)

        prop_file = self.get_scenario().get("properties-file")
        if prop_file:
            resource_files.append(prop_file)

        return resource_files

    def get_error_diagnostics(self):
        diagnostics = []
        if self.stdout is not None:
            with open(self.stdout.name) as fds:
                contents = fds.read().strip()
                if contents.strip():
                    diagnostics.append("Grinder STDOUT:\n" + contents)
        if self.stderr is not None:
            with open(self.stderr.name) as fds:
                contents = fds.read().strip()
                if contents.strip():
                    diagnostics.append("Grinder STDOUT:\n" + contents)
        return diagnostics


class DataLogReader(ResultsReader):
    """ Class to read KPI from data log """
    DELIMITER = ","
    DETAILS_REGEX = re.compile(r"worker\.(\S+) (.+) -> (\S+) (.+), (\d+) bytes")

    def __init__(self, filename, parent_logger):
        super(DataLogReader, self).__init__()
        self.report_by_url = False
        self.log = parent_logger.getChild(self.__class__.__name__)
        self.file = FileReader(filename=filename, parent_logger=self.log)
        self.idx = {}
        self.partial_buffer = ""
        self.start_time = 0
        self.end_time = 0
        self.concurrency = 0
        self.test_names = {}
        self.known_threads = set()

    def _read(self, last_pass=False):
        """
        Generator method that returns next portion of data

        :param last_pass:
        """
        self.log.debug("Reading grinder results...")

        self.lines = list(self.file.get_lines(size=1024 * 1024, last_pass=last_pass))

        lnum = None
        start = time.time()

        for lnum, line in enumerate(self.lines):
            if not self.idx:
                if not line.startswith('data.'):
                    self.__split(line)  # to capture early test name records
                    continue

                line = line[line.find(' '):]

                header_list = line.strip().split(self.DELIMITER)
                for _ix, field in enumerate(header_list):
                    self.idx[field.strip()] = _ix

            data_fields, worker_id = self.__split(line)
            if not data_fields:
                self.log.debug("Skipping line: %s", line.strip())
                continue

            yield self.parse_line(data_fields, worker_id, lnum)

        if lnum is not None:
            duration = time.time() - start
            if duration < 0.001:
                duration = 0.001

            self.log.debug("Log reading speed: %s lines/s", (lnum + 1) / duration)

    def parse_line(self, data_fields, worker_id, lnum):
        worker_id = worker_id.split('.')[1]
        t_stamp = int(int(data_fields[self.idx["Start time (ms since Epoch)"]]) / 1000.0)
        r_time = int(data_fields[self.idx["Test time"]]) / 1000.0
        latency = int(data_fields[self.idx["Time to first byte"]]) / 1000.0
        r_code = data_fields[self.idx["HTTP response code"]].strip()
        con_time = int(data_fields[self.idx["Time to resolve host"]]) / 1000.0
        con_time += int(data_fields[self.idx["Time to establish connection"]]) / 1000.0
        bytes_count = int(data_fields[self.idx["HTTP response length"]].strip())
        test_id = data_fields[self.idx["Test"]].strip()
        thread_id = worker_id + '/' + data_fields[self.idx["Thread"]].strip()
        if thread_id not in self.known_threads:
            self.known_threads.add(thread_id)
            self.concurrency += 1

        url, error_msg = self.__parse_prev_lines(worker_id, lnum, r_code, bytes_count)
        if int(data_fields[self.idx["Errors"]]) or int(data_fields[self.idx['HTTP response errors']]):
            if not error_msg:
                if r_code != '0':
                    error_msg = "HTTP %s" % r_code
                else:
                    error_msg = "Java exception calling TestRunner"
        else:
            error_msg = None  # suppress errors

        if self.report_by_url:
            label = url
        elif test_id in self.test_names:
            label = self.test_names[test_id]
        else:
            label = "Test #%s" % test_id

        source_id = ''  # maybe use worker_id somehow?
        return t_stamp, label, self.concurrency, r_time, con_time, latency, r_code, error_msg, source_id, bytes_count

    def __split(self, line):
        if not line.endswith("\n"):
            self.partial_buffer += line
            return None, None

        line = "%s%s" % (self.partial_buffer, line)
        self.partial_buffer = ""

        line = line.strip()
        if not line.startswith('data.'):
            line_parts = line.split(' ')
            if len(line_parts) > 1:
                if line_parts[1] == 'starting,':
                    # self.concurrency += 1
                    pass
                elif line_parts[1] == 'finished':
                    if self.concurrency > 0:
                        self.concurrency -= 1
                elif set(line_parts[1:5]) == {'Test', 'name', 'for', 'ID'}:
                    test_id = line_parts[5][:-1]
                    test_name = ' '.join(line_parts[6:])
                    self.test_names[test_id] = test_name
                    self.log.debug("Recognized test id %s => %s", test_id, test_name)
            return None, None

        worker_id = line[:line.find(' ')]
        line = line[line.find(' '):]
        data_fields = line.split(self.DELIMITER)
        if not data_fields[1].strip().isdigit():
            return None, None

        if len(data_fields) < max(self.idx.values()):
            return None, None

        return data_fields, worker_id

    def __parse_prev_lines(self, worker_id, lnum, r_code, bytes_count):
        url = ''
        error_msg = None
        for lineNo in reversed(range(max(lnum - 100, 0), lnum)):  # looking max 100 lines back. TODO: parameterize?
            line = self.lines[lineNo].strip()
            matched = self.DETAILS_REGEX.match(line)
            if not matched:
                continue

            if worker_id == matched.group(1) and r_code == matched.group(3) and str(bytes_count) == matched.group(5):
                return matched.group(2), matched.group(4)

        return url, error_msg


class Grinder(RequiredTool):        # todo: take it from maven and convert to JarTool(?)
    VERSION = "3.11"
    LOCAL_PATH = "~/.bzt/grinder-taurus/lib/grinder.jar"

    def __init__(self, config=None, **kwargs):
        settings = config or {}
        grinder_path = settings.get("path", self.LOCAL_PATH)
        grinder_path = get_full_path(grinder_path)

        download_link = settings.get("download-link", "")

        super(Grinder, self).__init__(tool_path=grinder_path, download_link=download_link, **kwargs)
        self.version = self.VERSION
        self.mirror_manager = GrinderMirrorsManager(self.http_client, self.log, self.version)

    def check_if_installed(self):
        self.log.debug("Trying %s: %s", self.tool_name, self.tool_path)
        try:
            out, err = self.call(["java", "-classpath", self.tool_path, "net.grinder.Grinder"])
            if err:
                out += err
            self.log.debug("%s stdout: %s", self.tool_name, out)
            return True
        except CALL_PROBLEMS as exc:
            self.log.warning("%s check failed: %s", self.tool_name, exc)
            return False

    def install(self):
        dest = get_full_path(self.tool_path, step_up=2)
        self.log.info("Will install %s into %s", self.tool_name, dest)
        grinder_dist = self._download(use_link=bool(self.download_link))
        self.log.info("Unzipping %s", grinder_dist)
        unzip(grinder_dist, dest, 'grinder-' + self.version)
        os.remove(grinder_dist)
        self.log.info("Installed grinder successfully")
        if not self.check_if_installed():
            raise ToolError("Unable to run %s after installation!" % self.tool_name)


class GrinderMirrorsManager(MirrorsManager):
    MIRRORS_SOURCE = "https://sourceforge.net/settings/mirror_choices?projectname=grinder&filename=The%20Grinder" \
                     "%203/{version}/grinder-{version}-binary.zip&dialog=true"
    DOWNLOAD_LINK = "https://downloads.sourceforge.net/project/grinder/The%20Grinder%203/{version}" \
                    "/grinder-{version}-binary.zip?r=&ts=" + str(int(time.time())) + "&use_mirror=autoselect"

    def __init__(self, http_client, parent_logger, grinder_version):
        self.grinder_version = grinder_version
        base_link = self.MIRRORS_SOURCE.format(version=self.grinder_version)
        super(GrinderMirrorsManager, self).__init__(http_client, base_link, parent_logger)

    def _parse_mirrors(self):
        links = []
        if self.page_source is not None:
            self.log.debug('Parsing mirrors...')
            base_link = "http://sourceforge.net/projects/grinder/files/The%20Grinder%203/{version}/grinder-{version}" \
                        "-binary.zip/download?use_mirror={mirror}"
            li_search_pattern = re.compile(r'<li id=".*?">')
            li_elements = li_search_pattern.findall(self.page_source)
            if li_elements:
                links = [base_link.format(version=self.grinder_version, mirror=link.strip('<li id="').strip('">')) for
                         link in li_elements]
        default_link = self.DOWNLOAD_LINK.format(version=self.grinder_version)
        if default_link not in links:
            links.append(default_link)
        self.log.debug('Total mirrors: %d', len(links))
        return links


class GrinderScriptBuilder(PythonGenerator):
    IMPORTS = """
from net.grinder.script import Test
from net.grinder.script.Grinder import grinder
from net.grinder.plugin.http import HTTPRequest, HTTPPluginControl, HTTPUtilities
from HTTPClient import NVPair
"""

    def __init__(self, scenario, parent_logger):
        super(GrinderScriptBuilder, self).__init__(scenario, parent_logger)
        self.label = "BZT Requests"

    def build_source_code(self):
        self.log.debug("Generating Python script for Grinder")
        self.root.append(self.gen_comment("This script was generated by Taurus", indent=0))
        self.root.append(self.add_imports())

        self.root.append(self.gen_new_line())

        default_address = self.scenario.get("default-address")
        url_arg = "url=%r" % default_address if default_address else ""
        self.root.append(self.gen_statement('request = HTTPRequest(%s)' % url_arg, indent=0))
        self.root.append(self.gen_statement('test = Test(1, "%s")' % self.label, indent=0))
        self.root.append(self.gen_statement('test.record(request)', indent=0))

        self.root.append(self.gen_new_line())

        self.root.append(self.gen_statement("defaults = HTTPPluginControl.getConnectionDefaults()", indent=0))
        self.root.append(self.gen_statement("utilities = HTTPPluginControl.getHTTPUtilities()", indent=0))

        headers = self.scenario.get_headers()
        if not self.scenario.get("keepalive", True):
            headers['Connection'] = 'close'

        if headers:
            self.root.append(self.gen_statement("defaults.setDefaultHeaders([", indent=0))
            for header, value in iteritems(headers):
                self.root.append(self.gen_statement("NVPair(%r, %r)," % (header, value), indent=4))
            self.root.append(self.gen_statement("])", indent=0))

        global_timeout = dehumanize_time(self.scenario.get("timeout", None))
        if global_timeout:
            self.root.append(self.gen_statement("defaults.setTimeout(%s)" % int(global_timeout * 1000), indent=0))

        cookie_flag = int(self.scenario.get("store-cookie", True))
        self.root.append(self.gen_statement("defaults.setUseCookies(%s)" % cookie_flag, indent=0))

        self.root.append(self.gen_new_line())

        self.root.append(self.gen_runner_class())

    @staticmethod
    def __list_to_nvpair_list(items):
        return "[" + ",".join("NVPair(%r, %r)" % (header, value) for header, value in items) + "]"

    def gen_runner_class(self):
        runner_classdef = self.gen_class_definition("TestRunner", ["object"])

        sleep_method = self.gen_method_definition("rampUpSleeper", ["self"])
        sleep_method.append(self.gen_statement("if grinder.runNumber != 0: return"))
        sleep_method.append(self.gen_statement("tprops = grinder.properties.getPropertySubset('taurus.')"))
        sleep_method.append(self.gen_statement("inc = tprops.getDouble('ramp_up', 0)/tprops.getInt('concurrency', 1)"))
        sleep_method.append(self.gen_statement("sleep_time = int(1000 * grinder.threadNumber * inc)"))
        sleep_method.append(self.gen_statement("grinder.sleep(sleep_time, 0)"))
        sleep_method.append(self.gen_statement("if sleep_time: grinder.logger.info('slept for %sms' % sleep_time)"))
        sleep_method.append(self.gen_statement("else: grinder.logger.info('No sleep needed')"))
        sleep_method.append(self.gen_new_line())
        runner_classdef.append(sleep_method)

        main_method = self.gen_method_definition("__call__", ["self"])
        main_method.append(self.gen_statement("self.rampUpSleeper()"))

        for req in self.scenario.get_requests():
            if not isinstance(req, HTTPRequest):
                msg = "Grinder script generator doesn't support '%s' blocks, skipping"
                self.log.warning(msg, req.NAME)
                continue

            method = req.method.upper()
            url = req.url
            local_headers = req.headers

            params = "[]"
            headers = self.__list_to_nvpair_list(iteritems(local_headers))

            main_method.append(self.gen_statement("request.%s(%r, %s, %s)" % (method, url, params, headers)))

            think_time = dehumanize_time(req.priority_option('think-time'))
            if think_time:
                main_method.append(self.gen_statement("grinder.sleep(%s)" % int(think_time * 1000)))

        runner_classdef.append(main_method)

        return runner_classdef

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