import asyncio
from datetime import datetime, timedelta
import functools
import logging
import os
import pprint
import zoneinfo

from fastapi import FastAPI, HTTPException
import httpx


pp = pprint.PrettyPrinter()
logger = logging.getLogger("uvicorn.error")
eastern = zoneinfo.ZoneInfo("America/New_York")

app = FastAPI()


CONFIG = {
    # salem, ma
    "zip": "01970",
    "lat": "42.3554334",
    "lon": "-71.060511",
    "weather_api_key": os.environ.get("WEATHER_API_KEY", ""),
    "auth_token": os.environ["AUTH_TOKEN"],
}


def format_datetime(dt):
    return dt.astimezone(eastern).isoformat()


def format_time(dt):
    return dt.strftime("%I:%M%p").lower()


def format_date(dt):
    return dt.strftime("%a %d").lower()


def relative_day_to_date(rel_dt):
    dt = datetime.now()
    day = timedelta(days=1)
    match rel_dt.lower().strip():
        case "yesterday":
            return format_date(dt - day)
        case "today":
            return format_date(dt)
        case "tomorrow":
            return format_date(dt + day)
        case passthrough:
            return passthrough


def fallback_handler(func):
    @functools.wraps(func)
    async def wrapper(*args, **kwargs):
        try:
            result = await func(*args, **kwargs)
        except Exception as e:
            logger.exception(e)
            return []
        return result

    return wrapper


@fallback_handler
async def fetch_pollen(zipcode):
    url = f"https://www.pollen.com/api/forecast/current/pollen/{zipcode}"
    headers = {
        "User-Agent": (
            "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) "
            "AppleWebKit/537.36 (KHTML, like Gecko) "
            "Chrome/123.0.0.0 Safari/537.36"
        ),
        "Accept": "application/json, text/plain, */*",
        "Referer": url,
        "Cookie": f"geo={zipcode}",
    }
    async with httpx.AsyncClient() as client:
        response = await client.get(url, headers=headers)
        response.raise_for_status()
        data = response.json()
        return [
            {
                "forecast_date": format_datetime(
                    datetime.fromisoformat(data["ForecastDate"])
                ),
                "periods": [
                    {"index": d["Index"], "period": relative_day_to_date(d["Type"])}
                    for d in data["Location"]["periods"]
                ],
            }
        ]


@fallback_handler
async def fetch_weather(lat, lon, weather_api_key):
    url = f"https://api.openweathermap.org/data/3.0/onecall?lat={lat}&lon={lon}&appid={weather_api_key}&units=imperial"
    async with httpx.AsyncClient() as client:
        response = await client.get(url)
        response.raise_for_status()
        data = response.json()
        current, periods = data["current"], data["daily"][:3]
        return [
            {
                "forecast_date": format_datetime(datetime.fromtimestamp(current["dt"])),
                "current_temp": int(round(current["temp"])),
                "current_feels_like": int(round(current["feels_like"])),
                "current_humidity": current["humidity"],
                "sunrise": format_time(datetime.fromtimestamp(current["sunrise"])),
                "sunset": format_time(datetime.fromtimestamp(current["sunset"])),
                "current_pressure": current["pressure"],
                "current_desc": current["weather"][0]["description"],
                "periods": [
                    {
                        "low": int(round(p["temp"]["min"])),
                        "high": int(round(p["temp"]["max"])),
                        "desc": p["weather"][0]["description"],
                        "humidity": p["humidity"],
                        "sunrise": format_time(datetime.fromtimestamp(p["sunrise"])),
                        "sunset": format_time(datetime.fromtimestamp(p["sunset"])),
                        "pressure": p["pressure"],
                        "period": format_date(datetime.fromtimestamp(p["dt"])),
                    }
                    for p in periods
                ],
            }
        ]


@app.get("/")
async def read_root(token: str):
    if token != CONFIG["auth_token"]:
        raise HTTPException(status_code=403, detail="unauthorized")

    [
        pollen,
        weather,
    ] = await asyncio.gather(
        fetch_pollen(CONFIG["zip"]),
        fetch_weather(CONFIG["lat"], CONFIG["lon"], CONFIG["weather_api_key"]),
    )

    return {
        "fetched_at": format_datetime(datetime.now()),
        "pollen": pollen,
        "weather": weather,
    }