from __future__ import annotations

import json
import os
import time
from typing import Any, TYPE_CHECKING

from ..util.setting import (
    CompilerType,
    JSON_FOLDER_BASE_DIR,
    TestList,
    TestPlatform,
    TestStatusType,
)
from ..util.utils import (
    detect_compiler_type,
    print_error,
    print_time,
    related_to_test_list,
)
from .parser.gcov_coverage_parser import GcovCoverageParser
from .parser.llvm_coverage_parser import LlvmCoverageParser
from .print_report import (
    file_oriented_report,
    html_oriented_report,
    line_oriented_report,
)


if TYPE_CHECKING:
    from .parser.coverage_record import CoverageRecord


# coverage_records: dict[str, LineInfo] = {}
covered_lines: dict[str, set[int]] = {}
uncovered_lines: dict[str, set[int]] = {}
tests_type: TestStatusType = {"success": set(), "partial": set(), "fail": set()}


def transform_file_name(
    file_path: str, interested_folders: list[str], platform: TestPlatform
) -> str:
    remove_patterns: set[str] = {".DEFAULT.cpp", ".AVX.cpp", ".AVX2.cpp"}
    for pattern in remove_patterns:
        file_path = file_path.replace(pattern, "")
    # if user has specified interested folder
    if interested_folders:
        for folder in interested_folders:
            if folder in file_path:
                return file_path[file_path.find(folder) :]
    # remove pytorch base folder path
    if platform == TestPlatform.OSS:
        from package.oss.utils import get_pytorch_folder  # type: ignore[import]

        pytorch_foler = get_pytorch_folder()
        assert file_path.startswith(pytorch_foler)
        file_path = file_path[len(pytorch_foler) + 1 :]
    return file_path


def is_intrested_file(
    file_path: str, interested_folders: list[str], platform: TestPlatform
) -> bool:
    ignored_patterns = ["cuda", "aten/gen_aten", "aten/aten_", "build/"]
    if any(pattern in file_path for pattern in ignored_patterns):
        return False

    # ignore files that are not belong to pytorch
    if platform == TestPlatform.OSS:
        # pyrefly: ignore  # import-error
        from package.oss.utils import get_pytorch_folder

        if not file_path.startswith(get_pytorch_folder()):
            return False
    # if user has specified interested folder
    if interested_folders:
        for folder in interested_folders:
            intersted_folder_path = folder if folder.endswith("/") else f"{folder}/"
            if intersted_folder_path in file_path:
                return True
        return False
    else:
        return True


def get_json_obj(json_file: str) -> tuple[Any, int]:
    """
    Sometimes at the start of file llvm/gcov will complains "fail to find coverage data",
    then we need to skip these lines
      -- success read: 0      -  this json file have the full json coverage information
      -- partial success: 1   -  this json file starts with some error prompt, but still have the coverage information
      -- fail to read: 2      -  this json file doesn't have any coverage information
    """
    read_status = -1
    with open(json_file) as f:
        lines = f.readlines()
        for line in lines:
            try:
                json_obj = json.loads(line)
            except json.JSONDecodeError:
                read_status = 1
                continue
            else:
                if read_status == -1:
                    # not meet jsonDecoderError before, return success
                    read_status = 0
                return (json_obj, read_status)
    return None, 2


def parse_json(json_file: str, platform: TestPlatform) -> list[CoverageRecord]:
    print("start parse:", json_file)
    json_obj, read_status = get_json_obj(json_file)
    if read_status == 0:
        tests_type["success"].add(json_file)
    elif read_status == 1:
        tests_type["partial"].add(json_file)
    else:
        tests_type["fail"].add(json_file)
        raise RuntimeError(
            "Fail to do code coverage! Fail to load json file: ", json_file
        )

    cov_type = detect_compiler_type(platform)

    coverage_records: list[CoverageRecord] = []
    if cov_type == CompilerType.CLANG:
        coverage_records = LlvmCoverageParser(json_obj).parse("fbcode")
        # print(coverage_records)
    elif cov_type == CompilerType.GCC:
        coverage_records = GcovCoverageParser(json_obj).parse()

    return coverage_records


def parse_jsons(
    test_list: TestList, interested_folders: list[str], platform: TestPlatform
) -> None:
    g = os.walk(JSON_FOLDER_BASE_DIR)

    for path, _, file_list in g:
        for file_name in file_list:
            if file_name.endswith(".json"):
                # if compiler is clang, we only analyze related json / when compiler is gcc, we analyze all jsons
                cov_type = detect_compiler_type(platform)
                if cov_type == CompilerType.CLANG and not related_to_test_list(
                    file_name, test_list
                ):
                    continue
                json_file = os.path.join(path, file_name)
                try:
                    coverage_records = parse_json(json_file, platform)
                except RuntimeError:
                    print_error("Fail to load json file: ", json_file)
                    continue
                # collect information from each target's export file and merge them together:
                update_coverage(coverage_records, interested_folders, platform)


def update_coverage(
    coverage_records: list[CoverageRecord],
    interested_folders: list[str],
    platform: TestPlatform,
) -> None:
    for item in coverage_records:
        # extract information for the record
        record = item.to_dict()
        file_path = record["filepath"]
        if not is_intrested_file(file_path, interested_folders, platform):
            continue
        covered_range = record["covered_lines"]
        uncovered_range = record["uncovered_lines"]
        # transform file name: remote/13223/caffe2/aten -> caffe2/aten
        file_path = transform_file_name(file_path, interested_folders, platform)

        # if file not exists, add it into dictionary
        if file_path not in covered_lines:
            covered_lines[file_path] = set()
        if file_path not in uncovered_lines:
            uncovered_lines[file_path] = set()
        # update this file's covered and uncovered lines
        if covered_range is not None:
            covered_lines[file_path].update(covered_range)
        if uncovered_range is not None:
            uncovered_lines[file_path].update(uncovered_range)


def update_set() -> None:
    for file_name in covered_lines:
        # difference_update
        uncovered_lines[file_name].difference_update(covered_lines[file_name])


def summarize_jsons(
    test_list: TestList,
    interested_folders: list[str],
    coverage_only: list[str],
    platform: TestPlatform,
) -> None:
    start_time = time.time()
    if detect_compiler_type(platform) == CompilerType.GCC:
        html_oriented_report()
    else:
        parse_jsons(test_list, interested_folders, platform)
        update_set()
        line_oriented_report(
            test_list,
            tests_type,
            interested_folders,
            coverage_only,
            covered_lines,
            uncovered_lines,
        )
        file_oriented_report(
            test_list,
            tests_type,
            interested_folders,
            coverage_only,
            covered_lines,
            uncovered_lines,
        )
    print_time("summary jsons take time: ", start_time)