import gleam/json
import gleam/list
import gleam/dynamic.{Dynamic}
import gleam/result
import bison/bson.{Value}
import bison/object_id
import bison/uuid
import bison/md5
import birl/time

pub fn doc_to_json(d: Value) -> json.Json {
  case d {
    bson.Document(doc) -> {
      doc
      |> list.map(fn(itm) {
        case itm.1 {
          bson.DateTime(item) -> {
            #(itm.0, json.string(time.to_naive(item)))
          }
          bson.Str(item) | bson.JS(item) -> {
            #(itm.0, json.string(item))
          }
          bson.Int32(tem) | bson.Int64(tem) | bson.Timestamp(tem) -> {
            #(itm.0, json.int(tem))
          }
          bson.Double(tem) -> {
            #(itm.0, json.float(tem))
          }
          bson.Boolean(tem) -> {
            #(itm.0, json.bool(tem))
          }
          bson.Binary(tem) -> {
            case tem {
              bson.MD5(bin) -> #(itm.0, json.string(md5.to_string(bin)))
              bson.UUID(bin) -> #(itm.0, json.string(uuid.to_string(bin)))
              //bson.Generic(bin) ->  #(itm.0, json.string(generic.to_string(bin)))
              _ -> #(itm.0, json.string(""))
            }
          }
          bson.ObjectId(item) -> {
            #(itm.0, json.string(object_id.to_string(item)))
          }
          bson.Regex(tem) -> {
            #(itm.0, json.string(tem.0))
          }
          bson.Document(lst) -> {
            #(
              itm.0,
              json.object(
                lst
                |> list.map(fn(op) { #(op.0, doc_to_json(op.1)) }),
              ),
            )
          }
          bson.Array(item) -> {
            #(itm.0, json.array(item, of: fn(a: Value) { doc_to_json(a) }))
          }
          _ -> {
            #(itm.0, json.object([]))
          }
        }
      })
    }
    _ -> list.new()
  }
  |> json.object
}

pub fn json_to_struct(
  myjson: json.Json,
  functor: fn(fn(String, Dynamic) -> Dynamic) -> a,
) {
  myjson
  |> json.to_string
  |> json.decode(fn(dyn) { Ok(dyn) })
  |> result.map(fn(key) {
    let getter = fn(title: String, from: Dynamic) {
      key
      |> dynamic.field(named: title, of: fn(value) { Ok(value) })
      |> result.unwrap(from)
    }
    Ok(functor(getter))
  })
}