import os
import unittest
from typing import Callable, List

from ci.check_files import (
    EXCLUDED_FILES,
    FileContent,
    FileContentChecker,
    MultiCheckerFileProcessor,
    collect_files_to_check,
)
from ci.paths import PROJECT_ROOT

SRC_ROOT = PROJECT_ROOT / "src"

ENABLE_PARANOID_GNU_HEADER_INSPECTION = False

if ENABLE_PARANOID_GNU_HEADER_INSPECTION:
    BANNED_HEADERS_ESP = ["esp32-hal.h"]
else:
    BANNED_HEADERS_ESP = []

BANNED_HEADERS_COMMON = [
    "assert.h",
    "iostream",
    "stdio.h",
    "cstdio",
    "cstdlib",
    "vector",
    "list",
    "map",
    "set",
    "queue",
    "deque",
    "algorithm",
    "memory",
    "thread",
    "mutex",
    "chrono",
    "fstream",
    "sstream",
    "iomanip",
    "exception",
    "stdexcept",
    "typeinfo",
    "ctime",
    "cmath",
    "complex",
    "valarray",
    "cfloat",
    "cassert",
    "cerrno",
    "cctype",
    "cwctype",
    "cstring",
    "cwchar",
    "cuchar",
    "cstdint",
    "cstddef",  # this certainally fails
    "type_traits",  # this certainally fails
]

BANNED_HEADERS_CORE = BANNED_HEADERS_COMMON + BANNED_HEADERS_ESP + ["Arduino.h"]


class BannedHeadersChecker(FileContentChecker):
    """Checker class for banned headers."""

    def __init__(self, banned_headers_list: List[str]):
        """Initialize with the list of banned headers to check for."""
        self.banned_headers_list = banned_headers_list

    def should_process_file(self, file_path: str) -> bool:
        """Check if file should be processed for banned headers."""
        # Check file extension
        if not file_path.endswith((".cpp", ".h", ".hpp", ".ino")):
            return False

        # Check if file is in excluded list
        if any(file_path.endswith(excluded) for excluded in EXCLUDED_FILES):
            return False

        return True

    def check_file_content(self, file_content: FileContent) -> List[str]:
        """Check file content for banned headers."""
        failings = []

        if len(self.banned_headers_list) == 0:
            return failings

        # Check each line for banned headers
        for line_number, line in enumerate(file_content.lines, 1):
            if line.strip().startswith("//"):
                continue

            for header in self.banned_headers_list:
                if (
                    f"#include <{header}>" in line or f'#include "{header}"' in line
                ) and "// ok include" not in line:
                    failings.append(
                        f"Found banned header '{header}' in {file_content.path}:{line_number}"
                    )

        return failings


def _test_no_banned_headers(
    test_directories: list[str],
    banned_headers_list: List[str],
    on_fail: Callable[[str], None],
) -> None:
    """Searches through the program files to check for banned headers."""
    # Collect files to check
    files_to_check = collect_files_to_check(test_directories)

    # Create processor and checker
    processor = MultiCheckerFileProcessor()
    checker = BannedHeadersChecker(banned_headers_list)

    # Process files
    results = processor.process_files_with_checkers(files_to_check, [checker])

    # Get results for banned headers checker
    all_failings = results.get("BannedHeadersChecker", []) or []

    if all_failings:
        msg = f"Found {len(all_failings)} banned header(s): \n" + "\n".join(
            all_failings
        )
        for failing in all_failings:
            print(failing)

        on_fail(msg)
    else:
        print("No banned headers found.")


class TestNoBannedHeaders(unittest.TestCase):

    def test_no_banned_headers_src(self) -> None:
        """Searches through the program files to check for banned headers."""

        def on_fail(msg: str) -> None:
            self.fail(
                msg + "\n"
                "You can add '// ok include' at the end of the line to silence this error for specific inclusions."
            )

        # Test directories as requested
        test_directories = [
            os.path.join(SRC_ROOT, "fl"),
            os.path.join(SRC_ROOT, "fx"),
            os.path.join(SRC_ROOT, "sensors"),
        ]
        _test_no_banned_headers(
            test_directories=test_directories,
            banned_headers_list=BANNED_HEADERS_CORE,
            on_fail=on_fail,
        )

    def test_no_banned_headers_examples(self) -> None:
        """Searches through the program files to check for banned headers."""

        def on_fail(msg: str) -> None:
            self.fail(
                msg + "\n"
                "You can add '// ok include' at the end of the line to silence this error for specific inclusions."
            )

        test_directories = ["examples"]

        _test_no_banned_headers(
            test_directories=test_directories,
            banned_headers_list=BANNED_HEADERS_COMMON,
            on_fail=on_fail,
        )


if __name__ == "__main__":
    unittest.main()