import uuid
from fastapi import APIRouter, HTTPException, Depends
from pydantic import BaseModel
from typing import Dict, Optional
from app.models import SystemCreate, SystemRecord
from app.internal import firestore as fstore
from app.internal.auth import require_admin_token, bootstrap_limiter

router = APIRouter(prefix="/systems", tags=["systems"])


class VocabularyTermBody(BaseModel):
    term: str


class TenCodesBody(BaseModel):
    ten_codes: Dict[str, str]


class AiFlagsBody(BaseModel):
    stt_enabled: Optional[bool] = None
    correlation_enabled: Optional[bool] = None


@router.get("")
async def list_systems():
    return await fstore.collection_list("systems")


@router.get("/{system_id}")
async def get_system(system_id: str):
    system = await fstore.doc_get("systems", system_id)
    if not system:
        raise HTTPException(404, f"System '{system_id}' not found.")
    return system


@router.post("", status_code=201)
async def create_system(body: SystemCreate, _: dict = Depends(require_admin_token)):
    system_id = str(uuid.uuid4())
    doc = SystemRecord(system_id=system_id, **body.model_dump())
    await fstore.doc_set("systems", system_id, doc.model_dump(), merge=False)
    return doc


@router.put("/{system_id}")
async def update_system(system_id: str, body: SystemCreate, _: dict = Depends(require_admin_token)):
    existing = await fstore.doc_get("systems", system_id)
    if not existing:
        raise HTTPException(404, f"System '{system_id}' not found.")
    await fstore.doc_update("systems", system_id, body.model_dump())
    return {**existing, **body.model_dump()}


@router.delete("/{system_id}", status_code=204)
async def delete_system(system_id: str, _: dict = Depends(require_admin_token)):
    existing = await fstore.doc_get("systems", system_id)
    if not existing:
        raise HTTPException(404, f"System '{system_id}' not found.")
    await fstore.doc_delete("systems", system_id)


# ── Per-system AI flag overrides ──────────────────────────────────────────────

@router.put("/{system_id}/ai-flags")
async def update_system_ai_flags(
    system_id: str,
    body: AiFlagsBody,
    _: dict = Depends(require_admin_token),
):
    """
    Set per-system AI flag overrides.  Only fields included in the body are
    written; omitted fields remain unchanged (or absent, meaning inherit global).
    Pass null to clear an override and fall back to the global flag.
    """
    existing = await fstore.doc_get("systems", system_id)
    if not existing:
        raise HTTPException(404, f"System '{system_id}' not found.")

    current: dict = existing.get("ai_flags") or {}
    for field, value in body.model_dump(exclude_unset=True).items():
        if value is None:
            current.pop(field, None)   # clear override → inherit global
        else:
            current[field] = value

    await fstore.doc_update("systems", system_id, {"ai_flags": current})
    return {"ok": True, "ai_flags": current}


# ── Ten-codes endpoints ────────────────────────────────────────────────────────

@router.get("/{system_id}/ten-codes")
async def get_ten_codes(system_id: str):
    """Return the ten-code dictionary for a system."""
    system = await fstore.doc_get("systems", system_id)
    if not system:
        raise HTTPException(404, f"System '{system_id}' not found.")
    return {"ten_codes": system.get("ten_codes") or {}}


@router.put("/{system_id}/ten-codes")
async def update_ten_codes(
    system_id: str,
    body: TenCodesBody,
    _: dict = Depends(require_admin_token),
):
    """Replace the ten-code dictionary for a system."""
    existing = await fstore.doc_get("systems", system_id)
    if not existing:
        raise HTTPException(404, f"System '{system_id}' not found.")
    await fstore.doc_update("systems", system_id, {"ten_codes": body.ten_codes})
    return {"ok": True, "ten_codes": body.ten_codes}


# ── Vocabulary endpoints ───────────────────────────────────────────────────────

@router.get("/{system_id}/vocabulary")
async def get_vocabulary(system_id: str):
    """Return approved vocabulary and pending induction suggestions."""
    existing = await fstore.doc_get("systems", system_id)
    if not existing:
        raise HTTPException(404, f"System '{system_id}' not found.")
    from app.internal.vocabulary_learner import get_vocabulary as _get
    return await _get(system_id)


@router.post("/{system_id}/vocabulary/bootstrap", status_code=202)
async def bootstrap_vocabulary(
    system_id: str,
    decoded: dict = Depends(require_admin_token),
):
    """Trigger a one-shot GPT-4o bootstrap to seed the vocabulary from local knowledge."""
    existing = await fstore.doc_get("systems", system_id)
    if not existing:
        raise HTTPException(404, f"System '{system_id}' not found.")
    bootstrap_limiter.check(system_id)
    from app.internal.vocabulary_learner import bootstrap_system_vocabulary
    terms = await bootstrap_system_vocabulary(system_id)
    return {"added": len(terms), "terms": terms}


@router.post("/{system_id}/vocabulary/terms")
async def add_vocabulary_term(
    system_id: str,
    body: VocabularyTermBody,
    _: dict = Depends(require_admin_token),
):
    """Manually add a term to the approved vocabulary."""
    existing = await fstore.doc_get("systems", system_id)
    if not existing:
        raise HTTPException(404, f"System '{system_id}' not found.")
    from app.internal.vocabulary_learner import add_term
    await add_term(system_id, body.term.strip())
    return {"ok": True}


@router.delete("/{system_id}/vocabulary/terms")
async def remove_vocabulary_term(
    system_id: str,
    body: VocabularyTermBody,
    _: dict = Depends(require_admin_token),
):
    """Remove a term from the approved vocabulary."""
    existing = await fstore.doc_get("systems", system_id)
    if not existing:
        raise HTTPException(404, f"System '{system_id}' not found.")
    from app.internal.vocabulary_learner import remove_term
    await remove_term(system_id, body.term)
    return {"ok": True}


@router.post("/{system_id}/vocabulary/pending/approve")
async def approve_pending(
    system_id: str,
    body: VocabularyTermBody,
    _: dict = Depends(require_admin_token),
):
    """Move a pending induction suggestion into the approved vocabulary."""
    existing = await fstore.doc_get("systems", system_id)
    if not existing:
        raise HTTPException(404, f"System '{system_id}' not found.")
    from app.internal.vocabulary_learner import approve_pending_term
    await approve_pending_term(system_id, body.term)
    return {"ok": True}


@router.post("/{system_id}/vocabulary/pending/dismiss")
async def dismiss_pending(
    system_id: str,
    body: VocabularyTermBody,
    _: dict = Depends(require_admin_token),
):
    """Dismiss a pending induction suggestion without adding it."""
    existing = await fstore.doc_get("systems", system_id)
    if not existing:
        raise HTTPException(404, f"System '{system_id}' not found.")
    from app.internal.vocabulary_learner import dismiss_pending_term
    await dismiss_pending_term(system_id, body.term)
    return {"ok": True}