"""
Discord radio channels — the HTTP face of internal/discord_streams.py.

Every bot-facing route is scoped to ONE Discord server (``guild_id`` in the
path or body) and acts for the org that server is linked to
(server-26#203): /leave in server A can no longer touch server B, and the
system/node/bot lists a server sees are its own org's.

Auth:
  * bot routes — the Discord bot's service key, or a platform admin.
  * PUT /discord/guilds/{id}/link — platform admin only.
  * GET /discord/node/{node_id}/tokens/{token_id} — that node's own API key;
    the token string is handed only to the node currently holding its lease.
"""
from __future__ import annotations

import secrets
from datetime import datetime, timezone
from typing import Optional

from fastapi import APIRouter, Depends, HTTPException, Security
from fastapi.responses import JSONResponse
from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
from pydantic import BaseModel

from app.config import settings
from app.internal import discord_leases as leases
from app.internal import discord_streams as streams
from app.internal import firestore as fstore
from app.internal.auth import require_admin_token, require_service_key_or_admin
from app.internal.logger import logger

router = APIRouter(prefix="/discord", tags=["discord"])
_bearer = HTTPBearer(auto_error=False)


def _error(e: streams.StreamError) -> JSONResponse:
    return JSONResponse(status_code=e.status,
                        content={"detail": e.message, "code": e.code, "invite": e.invite})


async def _org_or_403(guild_id: str) -> str:
    org_id = await streams.resolve_guild_org(guild_id)
    if not org_id:
        raise HTTPException(403, streams.ERROR_TEXT["no_org"])
    return org_id


def _public_stream(s: dict) -> dict:
    keep = ("stream_id", "guild_id", "channel_id", "channel_name", "system_id", "system_name", "mode",
            "desired", "node_id", "token_id", "actual", "stop_reason", "updated_at", "delivered", "reused")
    return {k: s.get(k) for k in keep if k in s}


# ---------------------------------------------------------------------------
# Bot routes
# ---------------------------------------------------------------------------

@router.get("/guilds/{guild_id}/overview")
async def guild_overview(guild_id: str, _: dict = Depends(require_service_key_or_admin)):
    """Everything one Discord server may see: its org's systems and nodes, its
    own streams, and which radio bots could serve it. No token strings."""
    org_id = await streams.resolve_guild_org(guild_id)
    if not org_id:
        return {"guild_id": guild_id, "org_id": None, "linked": False,
                "systems": [], "nodes": [], "streams": [], "bots": []}
    link = await fstore.doc_get(streams.GUILDS, guild_id)
    systems = await fstore.collection_list("systems", org_id=org_id)
    nodes = await fstore.collection_list("nodes", org_id=org_id)
    gstreams = [s for s in await fstore.collection_list(streams.STREAMS, guild_id=guild_id)
                if s.get("desired") == "on"]
    bots = []
    for t in await fstore.collection_list(leases.TOKENS):
        if t.get("org_id") not in (None, org_id) or t.get("valid") is False:
            continue
        lease = t.get("lease") or {}
        member = t.get("guild_ids")
        bots.append({
            "token_id": t.get("token_id"),
            "name": t.get("name"),
            "busy_here": any(leases.guild_of(s) == guild_id for s in lease.get("streams") or []),
            "member": None if member is None else guild_id in member,
            "invite_url": leases.invite_url(t.get("application_id"), guild_id),
        })
    return {
        "guild_id": guild_id,
        "org_id": org_id,
        "linked": bool(link and link.get("org_id")),
        "systems": [{"system_id": s.get("system_id"), "name": s.get("name")} for s in systems],
        "nodes": [{"node_id": n.get("node_id"), "name": n.get("name"), "status": n.get("status"),
                   "system_id": streams._effective_system(n)} for n in nodes],
        "streams": [_public_stream(s) for s in gstreams],
        "bots": bots,
    }


class StreamStart(BaseModel):
    guild_id: str
    channel_id: str
    system_id: str
    mode: str = "adhoc"
    preferred_token_id: Optional[str] = None
    channel_name: Optional[str] = None
    guild_name: Optional[str] = None
    created_by: Optional[str] = None


@router.post("/streams")
async def start_stream(body: StreamStart, _: dict = Depends(require_service_key_or_admin)):
    org_id = await _org_or_403(body.guild_id)
    system = await fstore.doc_get_cached("systems", body.system_id)
    if not system or system.get("org_id") not in (None, org_id):
        raise HTTPException(404, "System not found.")
    try:
        doc = await streams.start_stream(
            org_id=org_id, guild_id=body.guild_id, channel_id=body.channel_id, system_id=body.system_id,
            mode=body.mode, channel_name=body.channel_name, guild_name=body.guild_name,
            created_by=body.created_by, preferred_token_id=body.preferred_token_id,
            max_streams=settings.discord_guild_max_streams,
        )
    except streams.StreamError as e:
        return _error(e)
    return _public_stream(doc)


@router.get("/streams/{stream_id}")
async def get_stream(stream_id: str, _: dict = Depends(require_service_key_or_admin)):
    doc = await fstore.doc_get(streams.STREAMS, stream_id)
    if not doc:
        raise HTTPException(404, "Stream not found.")
    return _public_stream(doc)


class GuildStop(BaseModel):
    channel_id: Optional[str] = None
    reason: str = "stopped"


@router.post("/guilds/{guild_id}/stop")
async def stop_guild(guild_id: str, body: GuildStop, _: dict = Depends(require_service_key_or_admin)):
    stopped = await streams.stop_guild(guild_id, body.reason[:60], channel_id=body.channel_id)
    return {"stopped": stopped}


class GuildLink(BaseModel):
    org_id: str


@router.put("/guilds/{guild_id}/link")
async def link_guild(guild_id: str, body: GuildLink, decoded: dict = Depends(require_admin_token)):
    org = await fstore.doc_get("organizations", body.org_id)
    if not org:
        raise HTTPException(404, "Organization not found.")
    await fstore.doc_set(streams.GUILDS, guild_id, {
        "guild_id": guild_id, "org_id": body.org_id,
        "linked_by": decoded.get("uid"), "linked_at": datetime.now(timezone.utc).isoformat(),
    })
    return {"ok": True, "guild_id": guild_id, "org_id": body.org_id}


# ---------------------------------------------------------------------------
# Node route — token pickup
# ---------------------------------------------------------------------------

@router.get("/node/{node_id}/tokens/{token_id}")
async def node_token(
    node_id: str,
    token_id: str,
    credentials: Optional[HTTPAuthorizationCredentials] = Security(_bearer),
):
    """The bot token string, for the node that holds its lease and nobody else."""
    if not credentials:
        raise HTTPException(401, "Missing authorization")
    key_doc = await fstore.doc_get("node_keys", node_id)
    stored = (key_doc or {}).get("api_key") or ""
    if not stored or not secrets.compare_digest(stored, credentials.credentials):
        raise HTTPException(401, "Invalid node API key")
    tok = await fstore.doc_get(leases.TOKENS, token_id)
    lease = (tok or {}).get("lease") or {}
    if not tok or lease.get("node_id") != node_id or lease.get("releasing"):
        logger.warning(f"Node {node_id} asked for token {token_id} it does not hold a lease on")
        raise HTTPException(403, "This node does not hold a lease on that token.")
    return {"token_id": token_id, "token": tok["token"], "lease_id": lease.get("lease_id"),
            "name": tok.get("name")}