from __future__ import annotations

from hashlib import sha256

from app.modules.rag.indexing.code.entrypoints.registry import Entrypoint


class FastApiEntrypointDetector:
    _METHODS = {"get", "post", "put", "patch", "delete"}

    def detect(self, *, path: str, symbols: list) -> list[Entrypoint]:
        items: list[Entrypoint] = []
        for symbol in symbols:
            decorators = symbol.decorators or []
            for decorator in decorators:
                name = decorator.lower()
                tail = name.split(".")[-1]
                if tail not in self._METHODS and ".route" not in name:
                    continue
                route = decorator.split("(")[-1].rstrip(")") if "(" in decorator else decorator
                items.append(
                    Entrypoint(
                        entry_id=sha256(f"{path}|fastapi|{symbol.symbol_id}|{decorator}".encode("utf-8")).hexdigest(),
                        entry_type="http",
                        framework="fastapi",
                        route_or_command=route,
                        handler_symbol_id=symbol.symbol_id,
                        path=path,
                        start_line=symbol.start_line,
                        end_line=symbol.end_line,
                        metadata={"methods": [tail.upper()] if tail in self._METHODS else []},
                    )
                )
        return items