"""rio-tiler dynamic tile server for Natural Earth HYP_HR_SR_OB_DR (global basemap)"""

import os
from pathlib import Path

from fastapi import FastAPI, HTTPException
from fastapi.responses import HTMLResponse
from starlette.requests import Request
from starlette.responses import Response

from rio_tiler.errors import TileOutsideBounds
from rio_tiler.io import Reader
from rio_tiler.profiles import img_profiles

DATA_PATH = str(Path(__file__).parent / "data" / "HYP_HR_SR_OB_DR_cog.tif")

app = FastAPI(
    title="rio-tiler world",
    description="Global basemap tile server - Natural Earth HYP_HR_SR_OB_DR",
)


@app.get(
    "/tiles/{z}/{x}/{y}.png",
    responses={
        200: {"content": {"image/png": {}}, "description": "Return a PNG tile."},
        404: {"description": "Tile outside bounds."},
    },
    response_class=Response,
    description="Read global COG tile and return PNG (uint8 RGB, no rescaling needed)",
)
def tile(z: int, x: int, y: int):
    """Return a map tile for the given z/x/y coordinates."""
    try:
        with Reader(DATA_PATH) as cog:
            img = cog.tile(x, y, z)
    except TileOutsideBounds:
        raise HTTPException(status_code=404, detail="Tile outside bounds")

    content = img.render(
        img_format="PNG",
        **img_profiles.get("png", {}),
    )
    return Response(content, media_type="image/png")


@app.get("/tilejson.json", responses={200: {"description": "Return a TileJSON document"}})
def tilejson(request: Request):
    """Return a TileJSON 2.2.0 document."""
    with Reader(DATA_PATH) as cog:
        bounds = cog.get_geographic_bounds(cog.tms.rasterio_geographic_crs)
        minzoom = cog.minzoom
        maxzoom = cog.maxzoom

    base_url = str(request.base_url).rstrip("/")
    tile_url = f"{base_url}/tiles/{{z}}/{{x}}/{{y}}.png"

    return {
        "tilejson": "2.2.0",
        "name": "Natural Earth - HYP_HR_SR_OB_DR",
        "description": "Natural Earth cross-blended hypsometric tints with shaded relief",
        "tiles": [tile_url],
        "bounds": list(bounds),
        "minzoom": minzoom,
        "maxzoom": maxzoom,
        "center": [0, 20, minzoom],
    }