"""Registry (Forgejo) + market:catalog (memory-api) clients.

Shared by reindex.py and watch.py. Registry read side mirrors
cli/src/m2_market/registry.py's contents-API approach (contracts/registry-layout.md);
this module adds the listing-directory-listing and commit-polling calls the
indexer needs that the CLI client doesn't. Memory-api paths are configurable
constants (config.py), not hardcoded, per contracts/catalog-index.md.
"""

from __future__ import annotations

import base64
import json

import httpx


class RegistryError(RuntimeError):
    """Raised when the registry returns an unexpected response."""


class RegistryClient:
    def __init__(
        self,
        base_url: str,
        token: str,
        repo: str,
        ref: str = "main",
        *,
        auth_user: str = "m2",
        timeout: float = 15.0,
        transport: httpx.BaseTransport | None = None,
    ) -> None:
        owner, _, name = repo.partition("/")
        self._owner = owner
        self._repo = name
        self.ref = ref
        self._client = httpx.Client(
            base_url=base_url.rstrip("/"),
            auth=(auth_user, token),
            timeout=timeout,
            transport=transport,
        )

    def close(self) -> None:
        self._client.close()

    def __enter__(self) -> RegistryClient:
        return self

    def __exit__(self, *exc_info: object) -> None:
        self.close()

    def _repo_api(self, path: str) -> str:
        return f"/api/v1/repos/{self._owner}/{self._repo}{path}"

    def _get_json_contents(self, repo_path: str) -> dict:
        resp = self._client.get(
            self._repo_api(f"/contents/{repo_path}"), params={"ref": self.ref}
        )
        resp.raise_for_status()
        data = resp.json()
        content = base64.b64decode(data["content"])
        return json.loads(content)

    def list_listing_ids(self) -> list[str]:
        """Directory names under listings/ on `self.ref` (one per listing)."""
        resp = self._client.get(
            self._repo_api("/contents/listings"), params={"ref": self.ref}
        )
        if resp.status_code == 404:
            return []
        resp.raise_for_status()
        entries = resp.json()
        return sorted(e["name"] for e in entries if e.get("type") == "dir")

    def get_listing(self, listing_id: str) -> dict:
        return self._get_json_contents(f"listings/{listing_id}/listing.json")

    def get_solution(self, listing_id: str) -> dict | None:
        """solution.json is optional (used for `intent`); None if absent."""
        try:
            return self._get_json_contents(f"listings/{listing_id}/solution.json")
        except httpx.HTTPStatusError as exc:
            if exc.response.status_code == 404:
                return None
            raise

    def get_main_commit_sha(self) -> str:
        resp = self._client.get(self._repo_api(f"/branches/{self.ref}"))
        resp.raise_for_status()
        data = resp.json()
        try:
            return data["commit"]["id"]
        except KeyError as exc:
            raise RegistryError(f"unexpected branch response shape: {data!r}") from exc


class MemoryError_(RuntimeError):
    """Raised when memory-api returns an unexpected response."""


class MemoryClient:
    """Writer for the `market:catalog` partition (contracts/catalog-index.md).

    ONLY m2-market-indexer writes here (reindex + watch); everything else is a
    reader via CatalogClient's `/search`.
    """

    def __init__(
        self,
        base_url: str,
        api_key: str,
        partition: str,
        *,
        partition_path: str,
        document_path: str,
        timeout: float = 15.0,
        transport: httpx.BaseTransport | None = None,
    ) -> None:
        self.partition = partition
        self.partition_path = partition_path
        self.document_path = document_path
        self._client = httpx.Client(
            base_url=base_url.rstrip("/"),
            headers={"X-API-Key": api_key},
            timeout=timeout,
            transport=transport,
        )

    def close(self) -> None:
        self._client.close()

    def __enter__(self) -> MemoryClient:
        return self

    def __exit__(self, *exc_info: object) -> None:
        self.close()

    def _partition_url(self) -> str:
        return self.partition_path.format(partition=self.partition)

    def _document_url(self, doc_id: str) -> str:
        return self.document_path.format(partition=self.partition, doc_id=doc_id)

    def drop_partition(self) -> None:
        """Delete the partition wholesale; a later upsert recreates it."""
        resp = self._client.delete(self._partition_url())
        if resp.status_code not in (200, 204, 404):
            resp.raise_for_status()

    def upsert_document(self, doc_id: str, text: str, payload: dict) -> None:
        resp = self._client.put(
            self._document_url(doc_id),
            json={"text": text, "payload": payload},
        )
        resp.raise_for_status()

    def delete_document(self, doc_id: str) -> None:
        resp = self._client.delete(self._document_url(doc_id))
        if resp.status_code not in (200, 204, 404):
            resp.raise_for_status()


def build_embedded_text(listing: dict, solution: dict | None) -> str:
    """name + summary + keywords + intent(solution.json, if present) + evidence_summary."""
    parts = [
        listing.get("name", ""),
        listing.get("summary", ""),
        " ".join(listing.get("keywords", []) or []),
    ]
    if solution and solution.get("intent"):
        parts.append(solution["intent"])
    parts.append(listing.get("evidence_summary", ""))
    return "\n".join(p for p in parts if p)