"""Author RAG — Onboarding Wizard API.

Tracks wizard progress so the admin panel knows which step to show.
State is stored per-author in the DB using a simple JSON blob.

Routes:
  GET  /api/admin/{slug}/onboarding/status   → {current_step, completed_steps}
  POST /api/admin/{slug}/onboarding/complete  → mark a step complete
  POST /api/admin/{slug}/onboarding/dismiss   → dismiss wizard entirely
"""

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession
import json

from app.dependencies import get_current_author, get_db
from app.models.user import User

router = APIRouter()


class StepComplete(BaseModel):
    step: int   # 1-5


ONBOARDING_KEY = "onboarding_completed_steps"


def _get_meta(user: User) -> dict:
    """Read onboarding metadata from user's bio field (temporary storage)."""
    # We store it in a reserved metadata field until a dedicated table is added
    try:
        if user.bio and user.bio.startswith("__meta__"):
            return json.loads(user.bio[8:])
    except Exception:
        pass
    return {}


async def _set_meta(db: AsyncSession, user: User, meta: dict) -> None:
    user.bio = "__meta__" + json.dumps(meta)
    await db.commit()


@router.get("/{slug}/onboarding/status")
async def onboarding_status(
    slug: str,
    db: AsyncSession = Depends(get_db),
    author=Depends(get_current_author),
):
    """Return onboarding wizard state for this author."""
    if author.id != slug:
        raise HTTPException(403, "Forbidden")

    meta = _get_meta(author)
    completed = meta.get("completed_steps", [])
    dismissed = meta.get("dismissed", False)

    # Determine next step
    for step in range(1, 6):
        if step not in completed:
            current_step = step
            break
    else:
        current_step = 6  # All done

    return {
        "current_step": current_step,
        "completed_steps": completed,
        "dismissed": dismissed,
        "total_steps": 5,
        "is_complete": len(completed) >= 5 or dismissed,
    }


@router.post("/{slug}/onboarding/complete")
async def complete_step(
    slug: str,
    body: StepComplete,
    db: AsyncSession = Depends(get_db),
    author=Depends(get_current_author),
):
    """Mark a wizard step as completed."""
    if author.id != slug:
        raise HTTPException(403, "Forbidden")
    if not 1 <= body.step <= 5:
        raise HTTPException(400, "Step must be between 1 and 5")

    meta = _get_meta(author)
    completed = meta.get("completed_steps", [])
    if body.step not in completed:
        completed.append(body.step)
        meta["completed_steps"] = sorted(completed)
        await _set_meta(db, author, meta)

    return {"completed_steps": meta["completed_steps"]}


@router.post("/{slug}/onboarding/dismiss")
async def dismiss_wizard(
    slug: str,
    db: AsyncSession = Depends(get_db),
    author=Depends(get_current_author),
):
    """Dismiss the onboarding wizard — don't show it again."""
    if author.id != slug:
        raise HTTPException(403, "Forbidden")

    meta = _get_meta(author)
    meta["dismissed"] = True
    await _set_meta(db, author, meta)
    return {"dismissed": True}