# ===== LOAD LIBRARIES =====
library(httr)
library(sf)

# ===== CONFIGURATION =====
# set host, like http://localhost:8000, to where your Data Hub is running
DH_HOST <- ""

# Your personal API authentication token
# ATTENTION: tokens should not be added to production code!
# I.e, use a .Renviron file to store the token and set it like this:
# DH_TOKEN <- Sys.getenv("DH_TOKEN")
DH_TOKEN <- ""


# ===== MAIN FUNCTION =====
dh_shapes <- function(query_params) {
  response <- GET(
    url = paste0(DH_HOST, "/api/shapes/geometry"),
    query = query_params,
    add_headers("X-API-Key" = DH_TOKEN)
  )

  # Check if the request was successful (status code 200)
  if (status_code(response) != 200) {
    stop(sprintf("Request failed (%d): %s",
                 status_code(response),
                 content(response, "text")))
  }

  # reading GeoJSON
  gdf <- st_read(
    rawToChar(content(response, "raw")),
    quiet = TRUE
  )

  return(gdf)
}

# ===== EXAMPLE USAGE =====
shape_GH0804_gdf <- dh_shapes(list(
  shape_id =  "169",
  # Simplify geometry to reduce complexity/size in unit of Shapes,
  # for WGS84 degree: 0.001 ~> 111.3m
  # https://shapely.readthedocs.io/en/latest/manual.html#object.simplify
  # "simplify": 0.01
  )
)