# -*- Mode: python; tab-width: 8; indent-tabs-mode: nil -*-
# vim: set ts=8 sts=4 et sw=4 tw=80:
# 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 http://mozilla.org/MPL/2.0/.
import os
import re
from collections import OrderedDict

from talos import allowlist

SCRIPT_DIR = os.path.abspath(os.path.realpath(os.path.dirname(__file__)))

STAGE_STARTUP = 0
STAGE_STRINGS = ("startup", "normal", "shutdown")

LENGTH_IO_ENTRY = 5
LENGTH_NEXT_STAGE_ENTRY = 2
TOKEN_NEXT_STAGE = "NEXT-STAGE"

INDEX_OPERATION = 1
INDEX_DURATION = 2
INDEX_EVENT_SOURCE = 3
INDEX_FILENAME = 4

KEY_COUNT = "Count"
KEY_DURATION = "Duration"
KEY_NO_FILENAME = "(not available)"
KEY_RUN_COUNT = "RunCount"

LEAKED_SYMLINK_PREFIX = "::\\{"

PATH_SUBSTITUTIONS = OrderedDict(
    [
        ("profile", "{profile}"),
        ("firefox", "{xre}"),
        ("desktop", "{desktop}"),
        ("fonts", "{fonts}"),
        ("appdata", " {appdata}"),
    ]
)
NAME_SUBSTITUTIONS = OrderedDict(
    [
        ("installtime", "{time}"),
        ("prefetch", "{prefetch}"),
        ("thumbnails", "{thumbnails}"),
        # {appdata}\locallow\mozilla\temp-{*}
        ("temp-{", "{temp}"),
        ("cltbld.", "{cltbld}"),
        ("windows media player", "{media_player}"),
        # regex order matters
        (re.compile(r"{\w{8}-\w{4}-\w{4}-\w{4}-\w{12}}"), "{uuid}"),
        (re.compile(r"{uuid}\.\d+\.ver\w+\.db"), "{uuid-db}"),
    ]
)

TUPLE_EVENT_SOURCE_INDEX = 1
TUPLE_FILENAME_INDEX = 2
ALLOWLIST_FILENAME = os.path.join(SCRIPT_DIR, "mtio-allowlist.json")


def parse(logfilename, data):
    try:
        with open(logfilename, "r") as logfile:
            if not logfile:
                return False
            stage = STAGE_STARTUP
            for line in logfile:
                prev_filename = str()
                entries = line.strip().split(",")
                if len(entries) == LENGTH_IO_ENTRY:
                    if stage == STAGE_STARTUP:
                        continue
                    if entries[INDEX_FILENAME] == KEY_NO_FILENAME:
                        continue
                    # Format 1: I/O entry

                    # Temporary hack: logs are leaking Windows NT symlinks.
                    # We need to ignore those.
                    if entries[INDEX_FILENAME].startswith(LEAKED_SYMLINK_PREFIX):
                        continue

                    # We'll key each entry on (stage, event source,
                    # filename, operation)
                    key_tuple = (
                        STAGE_STRINGS[stage],
                        entries[INDEX_EVENT_SOURCE],
                        entries[INDEX_FILENAME],
                        entries[INDEX_OPERATION],
                    )
                    if key_tuple not in data:
                        data[key_tuple] = {
                            KEY_COUNT: 1,
                            KEY_RUN_COUNT: 1,
                            KEY_DURATION: float(entries[INDEX_DURATION]),
                        }
                    else:
                        if prev_filename != entries[INDEX_FILENAME]:
                            data[key_tuple][KEY_RUN_COUNT] += 1
                        data[key_tuple][KEY_COUNT] += 1
                        data[key_tuple][KEY_DURATION] += float(entries[INDEX_DURATION])
                    prev_filename = entries[INDEX_FILENAME]
                elif (
                    len(entries) == LENGTH_NEXT_STAGE_ENTRY
                    and entries[1] == TOKEN_NEXT_STAGE
                ):
                    # Format 2: next stage
                    stage = stage + 1
            return True
    except IOError as e:
        print("%s: %s" % (e.filename, e.strerror))
        return False


def write_output(outfilename, data):
    # Write the data out so that we can track it
    try:
        with open(outfilename, "w") as outfile:
            outfile.write("[\n")
            for idx, (key, value) in enumerate(data.items()):
                output = '    ["%s", "%s", "%s", "%s", %d, %d, %f]' % (
                    key[0],
                    key[1],
                    key[2],
                    key[3],
                    value[KEY_COUNT],
                    value[KEY_RUN_COUNT],
                    value[KEY_DURATION],
                )
                outfile.write(output)
                if idx >= 0:
                    outfile.write(",\n")
                else:
                    outfile.write("\n")
            outfile.write("]\n")
            return True
    except IOError as e:
        print("%s: %s" % (e.filename, e.strerror))
        return False


def main(argv):
    if len(argv) < 4:
        print("Usage: %s <main_thread_io_log_file> <output_file> <xre_path>" % argv[0])
        return 1
    if not os.path.exists(argv[3]):
        print('XRE Path "%s" does not exist' % argv[3])
        return 1
    data = {}
    if not parse(argv[1], data):
        print("Log parsing failed")
        return 1

    wl = allowlist.Allowlist(
        test_name="mainthreadio",
        paths={"{xre}": argv[3]},
        path_substitutions=PATH_SUBSTITUTIONS,
        name_substitutions=NAME_SUBSTITUTIONS,
        event_sources=["PoisonIOInterposer"],
    )
    if not wl.load(ALLOWLIST_FILENAME):
        print("Failed to load allowlist")
        return 1

    wl.filter(data, TUPLE_FILENAME_INDEX)

    if not write_output(argv[2], data):
        return 1

    # Disabled until we enable TBPL oranges
    # search for unknown filenames
    errors = wl.check(data, TUPLE_FILENAME_INDEX, TUPLE_EVENT_SOURCE_INDEX)
    if errors:
        strs = wl.get_error_strings(errors)
        wl.print_errors(strs)

    # search for duration > 1.0
    errors = wl.checkDuration(data, TUPLE_FILENAME_INDEX, "Duration")
    if errors:
        strs = wl.get_error_strings(errors)
        wl.print_errors(strs)

    return 0


if __name__ == "__main__":
    import sys

    sys.exit(main(sys.argv))
