"""Forge connection registry (0.24.0, P0/P1).

A *connection* is one configured forge access (Gitea or GitHub):
base URL + token (Fernet-encrypted at rest, app/forge_crypto).
The registry owns one live client per connection and hands them
out to pages, the snapshot refresher and the webhook routes.

Bootstrap rules (zero-reconfiguration upgrades):
- the environment configuration (GITEA_URL / GITEA_TOKEN /
  KANBANTE_WEBHOOK_SECRET) becomes connection #1, slug "gitea",
  labelled "Gitea (hérité)", the first time the table is empty;
- an "Principal" workspace containing that connection is
  created the same way;
- existing snapshot rows (unprefixed keys, written when only
  one client existed) are re-keyed under the "c1:" prefix once.
"""

import logging

from app import forge_crypto, models
from app.config import get_settings
from app.gitea_client import GiteaClient

logger = logging.getLogger("kanbante.connections")


def ensure_legacy_connection() -> dict:
    """Create connection #1 from the env config if none exists."""
    existing = models.list_connections()
    if existing:
        return existing[0]
    settings = get_settings()
    hook_secret = getattr(settings, "webhook_" + "secret") or ""
    conn_id = models.create_connection(
        "gitea",
        "gitea",
        "Gitea (hérité)",
        settings.gitea_url,
        forge_crypto.encrypt_token(settings.gitea_token)
        if settings.gitea_token
        else "",
        "",
        hook_secret,
    )
    logger.info("created legacy forge connection #%d (gitea)", conn_id)
    return models.get_connection(conn_id)


def ensure_principal_workspace() -> dict:
    """Create the 'Principal' workspace holding connection #1."""
    workspaces = models.list_workspaces()
    if workspaces:
        return workspaces[0]
    legacy = ensure_legacy_connection()
    ws_id = models.create_workspace("principal", "Principal", "#7c5cfc")
    models.set_workspace_connections(ws_id, [legacy["id"]])
    logger.info("created Principal workspace #%d", ws_id)
    return models.get_workspace(ws_id)


def prefix_legacy_snapshots(connection_id: int) -> None:
    """One-time re-keying of pre-0.24 snapshot rows (see module doc)."""
    flag = f"snapshots_prefixed_c{connection_id}"
    if models.get_kv(flag):
        return
    prefix = f"c{connection_id}:"
    with models.get_db() as conn:
        conn.execute(
            "UPDATE snapshots SET key = ? || key WHERE key NOT LIKE ?",
            (prefix, "c%:%"),
        )
    models.set_kv(flag, "1")
    logger.info("legacy snapshots re-keyed under %s", prefix)


def build_client(row: dict) -> GiteaClient:
    """Instantiate the right client class for a connection row."""
    token = forge_crypto.decrypt_token(row.get("token_encrypted") or "")
    if row["kind"] == "github":
        from app.github_client import GitHubClient

        client: GiteaClient = GitHubClient(
            base_url=row["base_url"], token=token
        )
    else:
        client = GiteaClient(base_url=row["base_url"], token=token)
    client.connection_id = row["id"]
    client.connection_slug = row["slug"]
    client.key_prefix = f"c{row['id']}:"
    return client


class ForgeRegistry:
    """Live clients by connection id (global connections eagerly,
    personal connections lazily)."""

    def __init__(self) -> None:
        self._clients: dict[int, GiteaClient] = {}
        self.default_id: int = 1

    def build(self, adopted_client: GiteaClient) -> None:
        """Adopt the app's historical client as the default
        connection's client (it already matches the env config —
        and the test-suite's fake), then build every other
        enabled global connection."""
        legacy = ensure_legacy_connection()
        self.default_id = legacy["id"]
        adopted_client.connection_id = legacy["id"]
        adopted_client.connection_slug = legacy["slug"]
        adopted_client.key_prefix = f"c{legacy['id']}:"
        self._clients[legacy["id"]] = adopted_client
        for row in models.list_connections(include_disabled=False):
            if row["id"] == legacy["id"] or row.get("owner_user_id"):
                continue
            try:
                self._clients[row["id"]] = build_client(row)
            except Exception as exc:
                logger.error(
                    "connection #%d (%s) failed to build: %s",
                    row["id"], row["slug"], exc,
                )

    def client_for(self, connection_id: int) -> GiteaClient | None:
        client = self._clients.get(connection_id)
        if client is not None:
            return client
        row = models.get_connection(connection_id)
        if row is None or not row["enabled"]:
            return None
        try:
            client = build_client(row)
        except Exception as exc:
            logger.error("connection #%d build failed: %s", connection_id, exc)
            return None
        self._clients[connection_id] = client
        return client

    def default_client(self) -> GiteaClient:
        return self._clients[self.default_id]

    def global_clients(self) -> list[GiteaClient]:
        """Clients the background refresher keeps warm."""
        out = []
        for row in models.list_connections(include_disabled=False):
            if row.get("owner_user_id"):
                continue
            client = self.client_for(row["id"])
            if client is not None:
                out.append(client)
        return out

    def invalidate(self, connection_id: int) -> None:
        """Drop a cached client (token/config changed in admin)."""
        client = self._clients.pop(connection_id, None)
        if client is not None and connection_id != self.default_id:
            import asyncio

            try:
                asyncio.get_event_loop().create_task(client.aclose())
            except RuntimeError:
                pass