"""Persona catalog routes."""

from __future__ import annotations

from typing import Annotated, Any, Literal

from fastapi import APIRouter, Depends, HTTPException, Response, status
from pydantic import BaseModel

from ..deps import CurrentPrincipal, Principal, Role, require_role
from ..persona_repository import (
    CatalogPersona,
    PersonaReviewAction,
    PersonaReviewItem,
    list_catalog_personas,
    list_persona_review_queue,
    update_persona_review_status,
)

router = APIRouter(prefix="/personas", tags=["personas"])
TeacherOrAdmin = Annotated[Principal, Depends(require_role(Role.TEACHER, Role.ADMIN))]


class PersonaSummary(BaseModel):
    code: str
    display_name: str
    difficulty: str
    theory_target: list[str]
    demographics: dict[str, Any]
    presenting_summary: str
    voice_preset: str | None = None
    source: str = "database"
    degraded: bool = False


class PersonaReviewSummary(BaseModel):
    persona_id: str
    code: str
    version: int
    status: Literal["draft", "review", "approved", "archived"]
    display_name: str
    difficulty: str
    theory_target: list[str]
    source_provenance: str
    is_synthetic: bool
    created_at: str | None = None
    approved_at: str | None = None


class PersonaReviewDecisionRequest(BaseModel):
    action: PersonaReviewAction


def _first_text_value(data: dict[str, Any]) -> str:
    for value in data.values():
        if isinstance(value, str) and value.strip():
            return value.strip()
    return ""


def _summary(entry: CatalogPersona) -> PersonaSummary:
    card = entry.card
    return PersonaSummary(
        code=card.code,
        display_name=card.display_name,
        difficulty=card.difficulty,
        theory_target=card.theory_target,
        demographics=card.demographics,
        presenting_summary=_first_text_value(card.presenting),
        source=entry.source,
        degraded=entry.degraded,
    )


def _review_summary(entry: PersonaReviewItem) -> PersonaReviewSummary:
    return PersonaReviewSummary(
        persona_id=entry.persona_id,
        code=entry.code,
        version=entry.version,
        status=entry.status,
        display_name=entry.display_name,
        difficulty=entry.difficulty,
        theory_target=entry.theory_target,
        source_provenance=entry.source_provenance,
        is_synthetic=entry.is_synthetic,
        created_at=entry.created_at,
        approved_at=entry.approved_at,
    )


def _ensure_teacher_or_admin(principal: Principal) -> None:
    if principal.role not in {Role.TEACHER, Role.ADMIN}:
        raise HTTPException(status.HTTP_403_FORBIDDEN, detail="only teachers and admins can review personas")


@router.get("", response_model=list[PersonaSummary])
async def list_personas(response: Response, _principal: CurrentPrincipal) -> list[PersonaSummary]:
    """Return latest approved personas from app.persona_card."""
    try:
        personas = await list_catalog_personas()
    except Exception as exc:
        raise HTTPException(
            status.HTTP_503_SERVICE_UNAVAILABLE,
            detail="persona catalog database unavailable",
        ) from exc

    if any(entry.degraded for entry in personas):
        response.headers["X-Vignette-Degraded"] = "true"
        response.headers["X-Vignette-Catalog-Source"] = "seed_fallback"
    else:
        response.headers["X-Vignette-Catalog-Source"] = "database"

    return [_summary(entry) for entry in personas]


@router.get("/review", response_model=list[PersonaReviewSummary])
async def list_persona_reviews(principal: TeacherOrAdmin) -> list[PersonaReviewSummary]:
    """Return draft/review personas awaiting faculty approval."""
    _ensure_teacher_or_admin(principal)
    try:
        queue = await list_persona_review_queue(role=principal.role.value)
    except Exception as exc:
        raise HTTPException(
            status.HTTP_503_SERVICE_UNAVAILABLE,
            detail="persona review queue database unavailable",
        ) from exc
    return [_review_summary(entry) for entry in queue]


@router.post("/review/{persona_id}", response_model=PersonaReviewSummary)
async def decide_persona_review(
    persona_id: str,
    request: PersonaReviewDecisionRequest,
    principal: TeacherOrAdmin,
) -> PersonaReviewSummary:
    """Approve a persona for learners or return it to draft for changes."""
    _ensure_teacher_or_admin(principal)
    try:
        updated = await update_persona_review_status(
            persona_id=persona_id,
            action=request.action,
            reviewer_id=principal.user_id,
            role=principal.role.value,
        )
    except ValueError as exc:
        raise HTTPException(status.HTTP_403_FORBIDDEN, detail=str(exc)) from exc
    except Exception as exc:
        raise HTTPException(
            status.HTTP_503_SERVICE_UNAVAILABLE,
            detail="persona review update database unavailable",
        ) from exc
    if updated is None:
        raise HTTPException(
            status.HTTP_404_NOT_FOUND,
            detail="persona review item not found or not pending review",
        )
    return _review_summary(updated)