"""AgroSense FastAPI backend.

Run:  uvicorn api.main:app --reload
Docs: http://127.0.0.1:8000/docs
"""
from __future__ import annotations

from functools import lru_cache
from pathlib import Path

from fastapi import Depends, FastAPI, File, Form, Header, HTTPException, UploadFile
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse, RedirectResponse, Response
from fastapi.staticfiles import StaticFiles
from pydantic import BaseModel, Field

from agrosense import RAGEngine, __version__

app = FastAPI(
    title="AgroSense API",
    version=__version__,
    description="RAG-based agriculture farming advisor (offline POC).",
)

# Allow the Streamlit UI (and any local frontend) to call the API.
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)


@lru_cache(maxsize=1)
def get_engine() -> RAGEngine:
    """Build the engine once and reuse it across requests."""
    return RAGEngine()


def require_admin(x_admin_token: str | None = Header(default=None)) -> None:
    """Gate admin endpoints on the AGROSENSE_ADMIN_TOKEN header."""
    from agrosense import config as _cfg
    if not _cfg.ADMIN_TOKEN or x_admin_token != _cfg.ADMIN_TOKEN:
        raise HTTPException(status_code=401, detail="Invalid or missing admin token.")


class QueryRequest(BaseModel):
    query: str = Field(..., min_length=1, examples=[
        "My soil is sandy, rainfall 900 mm, I plan to grow maize. "
        "What fertilizer and pest management should I follow?"
    ])
    top_k: int | None = Field(default=None, ge=1, le=20)
    rerank_k: int | None = Field(default=None, ge=1, le=20)
    # Optional: attach a live local weather forecast + advisory to the answer.
    location: str | None = Field(default=None, examples=["Belagavi"])
    latitude: float | None = Field(default=None, ge=-90, le=90)
    longitude: float | None = Field(default=None, ge=-180, le=180)
    # Optional: attach satellite monitoring (imagery + agroclimate) for the location.
    include_satellite: bool = Field(default=False)
    # Optional: answer language (ISO 639-1, e.g. "hi"). "en" = no translation.
    language: str = Field(default="en")
    # Optional: attach live mandi prices for a commodity (defaults to top retrieved crop).
    include_prices: bool = Field(default=False)
    commodity: str | None = Field(default=None)
    state: str | None = Field(default=None)
    # Optional: attach fused decision advisories (weather + satellite + NDVI).
    include_advisories: bool = Field(default=False)
    # Optional crop growth stage for crop-aware advisories.
    stage: str | None = Field(default=None, examples=["flowering"])


@app.on_event("startup")
def _warm_up() -> None:
    get_engine()  # load KB + build index at boot, not on first request


@app.get("/health")
def health() -> dict:
    engine = get_engine()
    return {
        "status": "ok",
        "version": __version__,
        "documents": engine.num_documents,
    }


# --- Knowledge-base admin (token-gated) ---
@app.get("/admin/kb", dependencies=[Depends(require_admin)])
def admin_list_kb() -> dict:
    from agrosense.kb_admin import EDITABLE_FIELDS
    entries = get_engine().list_kb_entries()
    return {"count": len(entries), "fields": EDITABLE_FIELDS, "entries": entries}


@app.post("/admin/kb", dependencies=[Depends(require_admin)])
def admin_add_kb(entry: dict) -> dict:
    try:
        new = get_engine().add_kb_entry(entry)
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    return {"ok": True, "entry": new, "count": get_engine().num_documents}


@app.put("/admin/kb/{entry_id}", dependencies=[Depends(require_admin)])
def admin_update_kb(entry_id: str, entry: dict) -> dict:
    try:
        updated = get_engine().update_kb_entry(entry_id, entry)
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    except KeyError:
        raise HTTPException(status_code=404, detail=f"Entry '{entry_id}' not found.")
    return {"ok": True, "entry": updated, "count": get_engine().num_documents}


@app.delete("/admin/kb/{entry_id}", dependencies=[Depends(require_admin)])
def admin_delete_kb(entry_id: str) -> dict:
    if not get_engine().delete_kb_entry(entry_id):
        raise HTTPException(status_code=404, detail=f"Entry '{entry_id}' not found.")
    return {"ok": True, "count": get_engine().num_documents}


# --- Document downloads (user manual, technical guide, SOP) ---
_DOCS_DIR = Path(__file__).resolve().parent.parent / "docs"
_DOC_FILES = {
    "user-manual": "AgroSense_User_Manual",
    "technical-guide": "AgroSense_Technical_Guide",
    "sop": "AgroSense_SOP",
    "gtm-plan": "AgroSense_GTM_Monetization_Plan",
    "instagram-campaign": "AgroSense_Instagram_Campaign",
    "facebook-campaign": "AgroSense_Facebook_Campaign",
    "linkedin-campaign": "AgroSense_LinkedIn_Campaign",
    "content-calendar": "AgroSense_30Day_Calendar",
}
_DOC_MEDIA = {
    "pdf": "application/pdf",
    "docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
}


@app.get("/downloads/{doc}.{fmt}")
def download_doc(doc: str, fmt: str) -> FileResponse:
    """Download a document (user-manual | technical-guide | sop) as pdf or docx."""
    if doc not in _DOC_FILES or fmt not in _DOC_MEDIA:
        raise HTTPException(status_code=404,
                            detail="Unknown document or format. Use "
                                   "/downloads/{user-manual|technical-guide|sop}.{pdf|docx}.")
    path = _DOCS_DIR / f"{_DOC_FILES[doc]}.{fmt}"
    if not path.exists():
        raise HTTPException(status_code=404, detail="Document not generated yet. "
                            "Run scripts/build_manual.py and scripts/build_tech_docs.py.")
    return FileResponse(path, media_type=_DOC_MEDIA[fmt], filename=path.name)


# Serve the single-page web app (web/) at /ui and redirect root to it.
_WEB_DIR = Path(__file__).resolve().parent.parent / "web"


@app.get("/")
def _root() -> RedirectResponse:
    return RedirectResponse(url="/ui/")


@app.get("/landing")
def _landing() -> FileResponse:
    """The public marketing landing page (campaign destination)."""
    page = _WEB_DIR / "landing" / "index.html"
    if not page.exists():
        raise HTTPException(status_code=404, detail="Landing page not found.")
    return FileResponse(page, media_type="text/html")


if _WEB_DIR.is_dir():
    app.mount("/ui", StaticFiles(directory=str(_WEB_DIR), html=True), name="ui")


@app.post("/query")
def query(req: QueryRequest) -> dict:
    engine = get_engine()
    answer = engine.answer(
        req.query,
        top_k=req.top_k,
        rerank_k=req.rerank_k,
        location=req.location,
        latitude=req.latitude,
        longitude=req.longitude,
        include_satellite=req.include_satellite,
        language=req.language,
        include_prices=req.include_prices,
        commodity=req.commodity,
        state=req.state,
        include_advisories=req.include_advisories,
        stage=req.stage,
    )
    return answer.to_dict()


@app.get("/weather")
def weather(location: str | None = None,
            latitude: float | None = None,
            longitude: float | None = None) -> dict:
    """Live local forecast + farming advisory (Open-Meteo, no API key).

    Returns {"available": false} when offline or the location can't be resolved,
    so callers can degrade gracefully.
    """
    engine = get_engine()
    forecast = engine.get_weather(location=location, latitude=latitude, longitude=longitude)
    if forecast is None:
        return {"available": False,
                "detail": "Forecast unavailable (offline or unknown location)."}
    return {"available": True, **forecast.to_dict()}


@app.get("/satellite")
def satellite(location: str | None = None,
              latitude: float | None = None,
              longitude: float | None = None,
              days: int = 30) -> dict:
    """Satellite monitoring: MODIS true-color + NDVI imagery (NASA GIBS) and
    satellite-derived agroclimate (NASA POWER). No API key required.

    Returns {"available": false} when offline or the location can't be resolved.
    """
    engine = get_engine()
    report = engine.get_satellite(location=location, latitude=latitude,
                                  longitude=longitude, days=days)
    if report is None:
        return {"available": False,
                "detail": "Satellite data unavailable (offline or unknown location)."}
    return {"available": True, **report.to_dict()}


@app.get("/news")
def news(query: str | None = None, region: str | None = None,
         topic: str | None = None, limit: int = 15) -> dict:
    """Latest headlines via Google News RSS (keyless). `region` selects the locale
    (IN/US/GB/AU/CA/SG, default IN); `topic` is a label from available_topics (mapped
    server-side); `query` is a raw override. Empty list on failure."""
    from agrosense.news import LOCALES, TOPICS
    engine = get_engine()
    if query is None and topic is not None and topic in TOPICS:
        query = TOPICS[topic]
    items = engine.get_news(query=query, region=region, limit=limit)
    return {"count": len(items), "items": [i.to_dict() for i in items],
            "region": (region or "IN").upper(),
            "available_regions": {k: v[3] for k, v in LOCALES.items()},
            "available_topics": list(TOPICS.keys())}


@app.get("/hazards")
def hazards(location: str | None = None, latitude: float | None = None,
            longitude: float | None = None, radius_km: float | None = None) -> dict:
    """Natural-hazard events (NASA EONET, keyless) + active fires (NASA FIRMS, needs
    a free map-key) near a location. Returns {"available": false} if unresolved."""
    engine = get_engine()
    report = engine.get_hazards(location=location, latitude=latitude,
                                longitude=longitude, radius_km=radius_km)
    if report is None:
        return {"available": False, "detail": "Provide a location or lat/lon."}
    return {"available": True, **report}


@app.post("/vision/classify")
async def vision_classify(file: UploadFile = File(...), task: str = "all") -> dict:
    """Classify an uploaded leaf/plant image: task = disease | plant | pest | all.
    Uses the trained model if configured, else an honest Pillow heuristic."""
    engine = get_engine()
    data = await file.read()
    out: dict = {}
    if task in ("disease", "all", "both"):
        out["disease"] = engine.predict_plant_disease(data)
    if task in ("plant", "all", "both"):
        out["plant"] = engine.predict_plant_species(data)
    if task in ("pest", "all"):
        out["pest"] = engine.predict_pest(data)
    return out


@app.post("/telemedicine")
async def telemedicine(crop: str | None = Form(None), symptoms: str | None = Form(None),
                       location: str | None = Form(None),
                       file: UploadFile | None = File(None)) -> dict:
    """Plant telemedicine consult: diagnosis + health + grounded prescription.
    Accepts crop/symptoms/location form fields and an optional leaf/plant photo."""
    engine = get_engine()
    image_bytes = await file.read() if file is not None else None
    return engine.plant_consultation(crop=crop, symptoms=symptoms,
                                     image_bytes=image_bytes, location=location)


@app.get("/notifications")
def notifications() -> dict:
    """Audit log of expert notifications sent (in-app log channel)."""
    return {"sent": get_engine().get_notifications()}


@app.get("/experts")
def experts() -> dict:
    """Directory of VERIFIED plant doctors available for live consultation."""
    return {"experts": get_engine().list_experts()}


@app.get("/clubs")
def clubs(type: str | None = None, key: str | None = None, search: str | None = None) -> dict:
    """List farmers' digital clubs, filtered by type (location|commodity), key or search."""
    return {"clubs": get_engine().list_clubs(ctype=type, key=key, search=search)}


@app.post("/clubs")
async def club_create(name: str = Form(""), type: str = Form("location"),
                      key: str = Form(""), description: str = Form(""),
                      creator: str = Form("")) -> dict:
    """Create a club (type 'location' or 'commodity'). Public."""
    try:
        club = get_engine().create_club(name, type, key, description, creator)
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    return {"ok": True, "club": club}


@app.get("/clubs/{club_id}")
def club_get(club_id: str) -> dict:
    """A club's detail: members, discussion feed and the video meeting room URL."""
    club = get_engine().get_club(club_id)
    if club is None:
        raise HTTPException(status_code=404, detail="Club not found.")
    return club


@app.post("/clubs/{club_id}/join")
async def club_join(club_id: str, member: str = Form("")) -> dict:
    try:
        return get_engine().join_club(club_id, member)
    except KeyError:
        raise HTTPException(status_code=404, detail="Club not found.")


@app.post("/clubs/{club_id}/post")
async def club_post(club_id: str, author: str = Form("Member"), text: str = Form(""),
                    link: str = Form("")) -> dict:
    if not text.strip():
        raise HTTPException(status_code=400, detail="Message text is required.")
    try:
        return get_engine().post_to_club(club_id, author, text, link)
    except KeyError:
        raise HTTPException(status_code=404, detail="Club not found.")


# --- government subsidies & schemes ---
@app.get("/subsidies")
def subsidies(level: str | None = None, state: str | None = None,
              category: str | None = None, search: str | None = None) -> dict:
    """List agricultural schemes/subsidies, filtered by level (central|state),
    state, category or search. Returns summaries; GET /subsidies/{id} for full detail."""
    from agrosense.subsidies import DISCLAIMER
    items = get_engine().list_subsidies(level, state, category, search)
    return {"count": len(items), "schemes": items, "disclaimer": DISCLAIMER}


@app.get("/subsidies/updates")
def subsidy_updates(limit: int = 12) -> dict:
    """Recent scheme announcements/updates across all schemes, newest first."""
    return {"updates": get_engine().subsidy_updates(limit)}


@app.get("/subsidies/{scheme_id}")
def subsidy_detail(scheme_id: str) -> dict:
    """Full publication for one scheme: benefits, eligibility, application process,
    documents, official portal, helpline and announcements."""
    from agrosense.subsidies import DISCLAIMER
    scheme = get_engine().get_subsidy(scheme_id)
    if scheme is None:
        raise HTTPException(status_code=404, detail="Scheme not found.")
    scheme["disclaimer"] = DISCLAIMER
    return scheme


@app.post("/admin/subsidies/{scheme_id}/update",
          dependencies=[Depends(require_admin)])
async def subsidy_add_update(scheme_id: str, text: str = Form(""),
                             date: str = Form("")) -> dict:
    """Admin: append an announcement/update to a scheme."""
    if not text.strip():
        raise HTTPException(status_code=400, detail="Update text is required.")
    try:
        scheme = get_engine().add_subsidy_update(scheme_id, text, date or None)
    except KeyError:
        raise HTTPException(status_code=404, detail="Scheme not found.")
    return {"ok": True, "scheme": scheme}


# --- agricultural finance (bank assistance / loans + apply) ---
@app.get("/finance")
def finance(category: str | None = None, provider: str | None = None,
            search: str | None = None) -> dict:
    """List agri-credit / bank-assistance products, filtered by category, provider or
    search. Also returns the available category list for filters."""
    from agrosense.finance import DISCLAIMER
    eng = get_engine()
    items = eng.list_finance(category, provider, search)
    return {"count": len(items), "products": items,
            "categories": eng.finance_categories(), "disclaimer": DISCLAIMER}


@app.get("/finance/{product_id}")
def finance_detail(product_id: str) -> dict:
    """Full detail for one finance product: interest, amount, tenure, eligibility,
    application process, documents, portal and helpline."""
    from agrosense.finance import DISCLAIMER
    product = get_engine().get_finance(product_id)
    if product is None:
        raise HTTPException(status_code=404, detail="Finance product not found.")
    product["disclaimer"] = DISCLAIMER
    return product


@app.post("/finance/{product_id}/apply")
async def finance_apply(product_id: str, name: str = Form(""), contact: str = Form(""),
                        amount: str = Form(""), location: str = Form(""),
                        message: str = Form("")) -> dict:
    """Lodge a loan enquiry/application against a product (name + contact required)."""
    try:
        app = get_engine().apply_finance(product_id, name, contact, amount or None,
                                         location, message)
    except KeyError:
        raise HTTPException(status_code=404, detail="Finance product not found.")
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    return {"ok": True, "application": app,
            "message": "Enquiry lodged. A bank/officer can follow up; also apply on the "
                       "official portal to proceed."}


@app.get("/admin/finance/applications", dependencies=[Depends(require_admin)])
def admin_finance_applications() -> dict:
    apps = get_engine().list_finance_applications()
    return {"count": len(apps), "applications": apps}


# --- land records (state-wise RoR portals + downloadable guide) ---
@app.get("/land-records")
def land_records(location: str | None = None, state: str | None = None) -> dict:
    """Land-record system for a place/state: official portal, local record name
    (RTC/Pahani, 7/12, Khatauni, ...), what to search by, steps, and what it contains.
    `location` may be a city — it is resolved to its state."""
    return get_engine().land_record_info(location=location, state=state)


@app.get("/land-records/guide.{fmt}")
def land_record_guide(fmt: str, location: str | None = None,
                      state: str | None = None) -> Response:
    """Download a printable land-record search guide (pdf|docx) for the resolved state."""
    if fmt not in _DOC_MEDIA:
        raise HTTPException(status_code=404, detail="Use guide.pdf or guide.docx.")
    try:
        filename, data = get_engine().land_record_guide(location=location, state=state, fmt=fmt)
    except ImportError:               # python-docx / fpdf2 not installed
        raise HTTPException(status_code=503, detail="Document generation needs "
                            "'python-docx' (docx) or 'fpdf2' (pdf) installed.")
    return Response(content=data, media_type=_DOC_MEDIA[fmt],
                    headers={"Content-Disposition": f'attachment; filename="{filename}"'})


# --- farmer trading platform (peer-to-peer produce marketplace, in Market tab) ---
@app.get("/market/listings")
def market_listings(type: str | None = None, commodity: str | None = None,
                    state: str | None = None, search: str | None = None,
                    include_closed: bool = False) -> dict:
    """Browse produce listings — filter by type (sell|buy), commodity, state or search."""
    items = get_engine().list_listings(type, commodity, state, search, include_closed)
    return {"count": len(items), "listings": items,
            "disclaimer": "POC marketplace — no payment/escrow/KYC. Verify the other "
                          "party and agree terms independently before transacting."}


@app.post("/market/listings")
async def market_create(type: str = Form("sell"), commodity: str = Form(""),
                        quantity: str = Form(""), unit: str = Form("kg"),
                        price: str = Form(""), currency: str = Form("INR"),
                        grade: str = Form(""), location: str = Form(""),
                        state: str = Form(""), seller: str = Form(""),
                        contact: str = Form(""), harvest_date: str = Form(""),
                        description: str = Form("")) -> dict:
    """Post a sell offer or buy requirement. Public."""
    try:
        listing = get_engine().create_listing({
            "type": type, "commodity": commodity, "quantity": quantity, "unit": unit,
            "price": price, "currency": currency, "grade": grade, "location": location,
            "state": state, "seller": seller, "contact": contact,
            "harvest_date": harvest_date, "description": description})
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    return {"ok": True, "listing": listing}


@app.get("/market/listings/{listing_id}")
def market_listing_get(listing_id: str) -> dict:
    """A listing's detail: produce, price, location, inquiries and a deal video room."""
    listing = get_engine().get_listing(listing_id)
    if listing is None:
        raise HTTPException(status_code=404, detail="Listing not found.")
    return listing


@app.post("/market/listings/{listing_id}/inquire")
async def market_inquire(listing_id: str, name: str = Form("Interested party"),
                         contact: str = Form(""), message: str = Form(""),
                         quantity: str = Form("")) -> dict:
    """Express interest in a listing (buyer/seller leaves contact + message)."""
    try:
        return get_engine().inquire_listing(listing_id, name, contact, message,
                                            quantity or None)
    except KeyError:
        raise HTTPException(status_code=404, detail="Listing not found.")
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))


@app.post("/market/listings/{listing_id}/close")
async def market_close(listing_id: str, status: str = Form("closed")) -> dict:
    """Mark a listing closed/sold (or reopen). Public in this POC."""
    try:
        return {"ok": True, "listing": get_engine().close_listing(listing_id, status)}
    except KeyError:
        raise HTTPException(status_code=404, detail="Listing not found.")
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))


@app.post("/doctors/apply")
async def doctor_apply(name: str = Form(""), specialization: str = Form(""),
                       region: str = Form(""), contact: str = Form(""),
                       languages: str = Form(""), credentials: str = Form(""),
                       registration_no: str = Form("")) -> dict:
    """Public onboarding: apply to become a plant doctor (status 'pending' until an
    admin verifies). Requires an ICAR/registration number."""
    try:
        doc = get_engine().onboard_doctor({
            "name": name, "specialization": specialization, "region": region,
            "contact": contact, "languages": languages, "credentials": credentials,
            "registration_no": registration_no})
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    return {"ok": True, "doctor": doc,
            "message": "Application received — pending admin verification."}


@app.get("/doctors/{doctor_id}")
def doctor_profile(doctor_id: str) -> dict:
    """Public profile page of a verified plant doctor (ratings + registration)."""
    prof = get_engine().get_doctor_profile(doctor_id)
    if prof is None:
        raise HTTPException(status_code=404, detail="Doctor not found or not verified.")
    return prof


@app.post("/doctors/{doctor_id}/rate")
async def doctor_rate(doctor_id: str, stars: int = Form(...),
                      comment: str = Form("")) -> dict:
    """Farmer rates a verified doctor (1-5 stars + optional comment)."""
    try:
        prof = get_engine().rate_doctor(doctor_id, stars, comment)
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    except KeyError:
        raise HTTPException(status_code=404, detail="Doctor not found or not verified.")
    return {"ok": True, "profile": prof}


@app.get("/admin/doctors", dependencies=[Depends(require_admin)])
def admin_list_doctors(status: str | None = None) -> dict:
    docs = get_engine().list_doctors(status=status)
    return {"count": len(docs), "doctors": docs}


@app.post("/admin/doctors/{doctor_id}/verify", dependencies=[Depends(require_admin)])
def admin_verify_doctor(doctor_id: str, approve: bool = Form(True),
                        note: str = Form("")) -> dict:
    try:
        doc = get_engine().verify_doctor(doctor_id, approve=approve, note=note)
    except KeyError:
        raise HTTPException(status_code=404, detail=f"Doctor '{doctor_id}' not found.")
    return {"ok": True, "doctor": doc}


@app.post("/consult/request")
async def consult_request(farmer_name: str = Form("Farmer"), crop: str | None = Form(None),
                          symptoms: str | None = Form(None), channel: str = Form("video"),
                          specialization: str | None = Form(None),
                          language: str | None = Form(None)) -> dict:
    """Create a live agri-doctor consultation: routes to an expert, attaches the AI
    consult as context, and returns a video room link + chat thread."""
    return get_engine().request_live_consult(
        farmer_name=farmer_name, crop=crop, symptoms=symptoms, channel=channel,
        specialization=specialization, language=language)


@app.get("/consult/{request_id}")
def consult_get(request_id: str) -> dict:
    rep = get_engine().get_consult(request_id)
    return rep or {"error": "not found", "id": request_id}


@app.post("/consult/{request_id}/message")
async def consult_message(request_id: str, sender: str = Form("farmer"),
                          text: str = Form(...)) -> dict:
    rep = get_engine().add_consult_message(request_id, sender, text)
    return rep or {"error": "not found", "id": request_id}


@app.get("/commodities")
def commodities() -> dict:
    """Commodity prices for the ticker: Gold/Silver/Crude Oil/Coffee (Yahoo Finance,
    keyless) and Arecanut/Coconut (Agmarknet, key-gated -> null without a key)."""
    engine = get_engine()
    return {"items": engine.get_commodities()}


@app.get("/traditional")
def traditional(activity: str = "general", location: str | None = None) -> dict:
    """Traditional Advisor: Panchang (astrological) suitability for a daily farm
    activity + traditional/desi practices for the area. Keyless."""
    return get_engine().traditional_advice(activity=activity, location=location)


@app.get("/radio")
def radio(country: str = "IN", state: str | None = None, tag: str | None = None,
          search: str | None = None, limit: int = 60) -> dict:
    """Internet radio stations (default: all India) via Radio Browser (keyless).
    Returns playable stream URLs. Empty list on failure."""
    items = get_engine().get_radio_stations(country=country, state=state, tag=tag,
                                            search=search, limit=limit)
    return {"count": len(items), "stations": items}


@app.get("/datetime")
def datetime_header() -> dict:
    """Current date in Gregorian + Indian National (Saka) calendars, and IST time."""
    from agrosense.calendars import datetime_header as _hdr
    return _hdr()


@app.get("/planetary")
def planetary(location: str | None = None,
              latitude: float | None = None,
              longitude: float | None = None) -> dict:
    """Planetary positions (Sun, Moon + phase, planets) for the current time at a
    place or lat/lon: altitude/azimuth, RA/Dec, what's above the horizon. Keyless,
    computed locally. Returns {"available": false} if the location can't resolve.
    """
    engine = get_engine()
    report = engine.get_planetary(location=location, latitude=latitude, longitude=longitude)
    if report is None:
        return {"available": False,
                "detail": "Planetary data unavailable (unknown location)."}
    return {"available": True, **report.to_dict()}


@app.get("/environment")
def environment(location: str | None = None,
                latitude: float | None = None,
                longitude: float | None = None) -> dict:
    """Location environment profile: lat/lon, altitude, population, humidity,
    sunlight, wind (speed + direction), air quality, pollen, groundwater proxy.
    Keyless (Open-Meteo). Returns {"available": false} when offline/unknown location.
    """
    engine = get_engine()
    profile = engine.get_environment(location=location, latitude=latitude,
                                     longitude=longitude)
    if profile is None:
        return {"available": False,
                "detail": "Environment data unavailable (offline or unknown location)."}
    return {"available": True, **profile.to_dict()}


@app.get("/advisories")
def advisories(location: str | None = None,
               latitude: float | None = None,
               longitude: float | None = None,
               crop: str | None = None,
               stage: str | None = None) -> dict:
    """Decision-fusion advisories combining weather + satellite + NDVI for a place
    or lat/lon, tuned to the crop and growth stage (seedling/vegetative/flowering/
    maturity). Returns {"available": false} when offline or location can't resolve.
    """
    engine = get_engine()
    report = engine.get_fusion_advisories(location=location, latitude=latitude,
                                          longitude=longitude, crop=crop, stage=stage)
    if report is None:
        return {"available": False,
                "detail": "Advisories unavailable (offline or unknown location)."}
    return {"available": True, **report.to_dict()}


@app.get("/languages")
def languages() -> dict:
    """Languages AgroSense can translate answers into."""
    from agrosense.translation import SUPPORTED_LANGUAGES
    return {"languages": SUPPORTED_LANGUAGES}


@app.get("/prices")
def prices(commodity: str | None = None,
           state: str | None = None,
           market: str | None = None) -> dict:
    """Live mandi prices (Agmarknet via data.gov.in). Requires a free api-key.

    Returns {"available": false} when no key is configured or the service is down.
    """
    engine = get_engine()
    report = engine.get_market_prices(commodity=commodity, state=state, market=market)
    if report is None:
        return {"available": False,
                "detail": "Prices unavailable (no data.gov.in key configured or offline)."}
    return {"available": True, **report.to_dict()}