"""FastAPI app — Jimi Gallery API + static file serving."""
import os
from pathlib import Path

from fastapi import Body, Depends, FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles

from auth import ADMIN_PASSWORD, issue_token, require_auth
from db import artists, exhibitions, news, settings_col, strip_id
from seed import SEED

app = FastAPI(title="Jimi Gallery API")

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=False,
    allow_methods=["*"],
    allow_headers=["*"],
)


# -------------------- bootstrap --------------------

@app.on_event("startup")
async def bootstrap():
    """Seed an empty DB on first run so the app has something to show."""
    if await settings_col.find_one({"_id": "singleton"}) is None:
        await settings_col.insert_one({"_id": "singleton", **SEED["settings"]})
    if await artists.estimated_document_count() == 0 and SEED["artists"]:
        await artists.insert_many([dict(a) for a in SEED["artists"]])
    if await exhibitions.estimated_document_count() == 0 and SEED["exhibitions"]:
        await exhibitions.insert_many([dict(e) for e in SEED["exhibitions"]])
    if await news.estimated_document_count() == 0 and SEED["news"]:
        await news.insert_many([dict(n) for n in SEED["news"]])


# -------------------- auth --------------------

@app.post("/api/auth/login")
async def login(body: dict = Body(...)):
    if body.get("password") != ADMIN_PASSWORD:
        raise HTTPException(status_code=401, detail="Incorrect password")
    return {"token": issue_token()}


@app.get("/api/auth/me")
async def me(_: bool = Depends(require_auth)):
    return {"ok": True}


# -------------------- settings --------------------

@app.get("/api/settings")
async def get_settings():
    doc = await settings_col.find_one({"_id": "singleton"})
    if doc is None:
        doc = {"_id": "singleton", **SEED["settings"]}
        await settings_col.insert_one(dict(doc))
    return strip_id(doc)


@app.put("/api/settings")
async def put_settings(body: dict = Body(...), _: bool = Depends(require_auth)):
    body.pop("_id", None)
    await settings_col.update_one(
        {"_id": "singleton"}, {"$set": body}, upsert=True
    )
    return strip_id(await settings_col.find_one({"_id": "singleton"}))


# -------------------- helpers for collections --------------------

def _require_id(body):
    if not body.get("id"):
        raise HTTPException(status_code=400, detail="id is required")


async def _list(coll):
    return [strip_id(d) async for d in coll.find({})]


async def _get(coll, id):
    d = await coll.find_one({"id": id})
    if d is None:
        raise HTTPException(status_code=404, detail="not found")
    return strip_id(d)


async def _upsert(coll, id, body):
    body.pop("_id", None)
    body["id"] = id
    await coll.update_one({"id": id}, {"$set": body}, upsert=True)
    return strip_id(await coll.find_one({"id": id}))


async def _delete(coll, id):
    await coll.delete_one({"id": id})
    return {"ok": True}


# -------------------- artists --------------------

@app.get("/api/artists")
async def list_artists():
    return await _list(artists)


@app.get("/api/artists/{id}")
async def get_artist(id: str):
    return await _get(artists, id)


@app.put("/api/artists/{id}")
async def put_artist(id: str, body: dict = Body(...), _: bool = Depends(require_auth)):
    return await _upsert(artists, id, body)


@app.delete("/api/artists/{id}")
async def delete_artist(id: str, _: bool = Depends(require_auth)):
    return await _delete(artists, id)


# -------------------- exhibitions --------------------

@app.get("/api/exhibitions")
async def list_exhibitions():
    return await _list(exhibitions)


@app.get("/api/exhibitions/{id}")
async def get_exhibition(id: str):
    return await _get(exhibitions, id)


@app.put("/api/exhibitions/{id}")
async def put_exhibition(id: str, body: dict = Body(...), _: bool = Depends(require_auth)):
    return await _upsert(exhibitions, id, body)


@app.delete("/api/exhibitions/{id}")
async def delete_exhibition(id: str, _: bool = Depends(require_auth)):
    return await _delete(exhibitions, id)


# -------------------- news --------------------

@app.get("/api/news")
async def list_news():
    return await _list(news)


@app.get("/api/news/{id}")
async def get_news_item(id: str):
    return await _get(news, id)


@app.put("/api/news/{id}")
async def put_news_item(id: str, body: dict = Body(...), _: bool = Depends(require_auth)):
    return await _upsert(news, id, body)


@app.delete("/api/news/{id}")
async def delete_news_item(id: str, _: bool = Depends(require_auth)):
    return await _delete(news, id)


# -------------------- admin: seed / export / import --------------------

async def _apply_full_set(settings_doc, artists_list, exhibitions_list, news_list):
    await settings_col.delete_many({})
    await artists.delete_many({})
    await exhibitions.delete_many({})
    await news.delete_many({})

    s = dict(settings_doc)
    s.pop("_id", None)
    await settings_col.insert_one({"_id": "singleton", **s})

    if artists_list:
        await artists.insert_many([dict(a) for a in artists_list])
    if exhibitions_list:
        await exhibitions.insert_many([dict(e) for e in exhibitions_list])
    if news_list:
        await news.insert_many([dict(n) for n in news_list])


@app.post("/api/admin/seed")
async def apply_seed(_: bool = Depends(require_auth)):
    await _apply_full_set(
        SEED["settings"], SEED["artists"], SEED["exhibitions"], SEED["news"]
    )
    return {"ok": True}


@app.get("/api/admin/export")
async def export_all():
    settings_doc = await settings_col.find_one({"_id": "singleton"}) or {}
    return {
        "settings": strip_id(settings_doc) or dict(SEED["settings"]),
        "artists": [strip_id(d) async for d in artists.find({})],
        "exhibitions": [strip_id(d) async for d in exhibitions.find({})],
        "news": [strip_id(d) async for d in news.find({})],
    }


@app.post("/api/admin/import")
async def import_all(body: dict = Body(...), _: bool = Depends(require_auth)):
    missing = [
        k for k in ("settings", "artists", "exhibitions", "news") if k not in body
    ]
    if missing:
        raise HTTPException(status_code=400, detail=f"missing keys: {missing}")
    await _apply_full_set(
        body["settings"], body["artists"], body["exhibitions"], body["news"]
    )
    return {"ok": True}


# -------------------- static file serving --------------------

STATIC_DIR = Path(
    os.environ.get("STATIC_DIR", Path(__file__).resolve().parent.parent)
)

# Mounted last so /api/* routes defined above take precedence.
app.mount("/", StaticFiles(directory=str(STATIC_DIR), html=True), name="static")