from __future__ import annotations

from pathlib import Path


TextFileTypes = {"markdown", "text", "config", "html"}

MimeTypeMap = {
    ".png": "image/png",
    ".jpg": "image/jpeg",
    ".jpeg": "image/jpeg",
    ".gif": "image/gif",
    ".webp": "image/webp",
    ".svg": "image/svg+xml",
    ".mp4": "video/mp4",
    ".webm": "video/webm",
    ".mov": "video/quicktime",
    ".mkv": "video/x-matroska",
}


def ReadTextFile(FilePath: Path) -> str:
    """Read a text-classified file as UTF-8."""
    return FilePath.read_text(encoding="utf-8")


def GetFileSize(FilePath: Path) -> int:
    return FilePath.stat().st_size


def GetMimeType(FilePath: Path) -> str:
    return MimeTypeMap.get(FilePath.suffix.lower(), "application/octet-stream")


def ParseRangeHeader(RangeHeader: str, FileSize: int) -> tuple[int, int]:
    """Parse a single-range HTTP Range header into an inclusive (Start, End)."""
    RangeValue = RangeHeader.replace("bytes=", "").strip()
    StartText, _, EndText = RangeValue.partition("-")

    Start = int(StartText) if StartText else 0
    End = int(EndText) if EndText else FileSize - 1
    End = min(End, FileSize - 1)

    return Start, End