defmodule Api.Study do
  import Ecto.Query
  alias Api.Repo
  require Logger

  def open_study(accession) do
    Envar.load(".env")
    Envar.require_env_file(".env")

    idsite = Envar.get("IDSITE") |> String.to_integer
    domain = Envar.get("CHECK_ORIGIN")
    escaneados = Envar.get("ESCANEADOS")

    id_study = if Envar.get("IDENTIFIERFIELD") == "ACCESSIONNUMBER" do
      query =
      from s in "study",
      where: s.accessionnumber == ^accession,
      select: s.idstudy
      idstudy = Repo.one(query)
      Logger.info("accession ----> #{inspect(accession)} - idstudy -------> #{inspect(idstudy)}")
      idstudy
    else
      accession
    end

    id_study = if is_integer(id_study), do: id_study, else: String.to_integer(id_study)


    # accession_fragment =
    #   if Envar.get("IDENTIFIERFIELD") == "ACCESSIONNUMBER" do
    #     fragment("?::text", ^accession)
    #   else
    #     fragment("?::integer", ^id_study)
    #   end


    Logger.info("id_study -------> #{inspect(id_study)}")

    # Las siguientes consultas obtienen la información completa
    # de un estudio.

    # informes
    subquery1 = subquery(
      from s in "study",
        join: sr in "studyreport", on: sr.idstudy == s.idstudy,
        join: p in "patient", on: s.idpatient == p.idpatient,
        where: not is_nil(sr.body) and s.idstudy == ^id_study and
               sr.idstatus in subquery(
                 from st in "statuses",
                   where: st.statusname in ["Revisado", "Final"],
                   select: st.idstatus
               ),
        select: %{
          idsite: type(^idsite, :integer),
          iddocument: fragment("substring(encrypt(?::text::bytea, '1nf0rm3', 'aes')::text from 3)", sr.idstudyreport),
          document_name: "INFORME PRINCIPAL",
          document_type: "pdf",
          url: fragment(
            "concat(?::text, ?::text, substring(encrypt(?::text::bytea, '1nf0rm3', 'aes')::text from 3))",
            ^domain,
            "/api/downloadpdf/",
            sr.idstudyreport
          ),
          patientname: p.patientname,
          proceduredescription: s.studydescription,
          studydate: fragment("TO_CHAR(?, 'YYYY-MM-DD')", s.studydate),
          studytime: fragment("TO_CHAR(?, 'HH24:MI:SS')", s.studytime),
          accessionnumber: s.accessionnumber,
          patientid: p.patientid
        }
    )

    # escaneados
    subquery2 = subquery(
      from s in "study",
        join: ss in "studyscans", on: ss.idstudy == s.idstudy,
        join: sc in "scanclasses", on: sc.idscanclass == ss.idscanclass,
        join: p in "patient", on: s.idpatient == p.idpatient,
        where: s.idstudy == ^id_study,
        select: %{
          idsite: type(^idsite, :integer),
          iddocument: fragment("substring(encrypt(?::text::bytea, '1nf0rm3', 'aes')::text from 3)", ss.idstudyscan),
          document_name: sc.scanclass,
          document_type: "url",
          url: fragment(
            "concat(?::text, substring(encrypt(?::text::bytea, '1nf0rm3', 'aes')::text from 3))",
            ^escaneados,
            ss.idstudyscan
          ),
          patientname: p.patientname,
          proceduredescription: s.studydescription,
          studydate: fragment("TO_CHAR(?, 'YYYY-MM-DD')", s.studydate),
          studytime: fragment("TO_CHAR(?, 'HH24:MI:SS')", s.studytime),
          accessionnumber: s.accessionnumber,
          patientid: p.patientid
        }
    )

    # adjuntos
    subquery3 =
      from s in "study",
        join: sa in "studyattachments", on: sa.idstudy == s.idstudy,
        join: p in "patient", on: p.idpatient == s.idpatient,
        where: s.idstudy == ^id_study,
        select: %{
          idsite: type(^idsite, :integer),
          iddocument: fragment("substring(encrypt(?::text::bytea, '1nf0rm3', 'aes')::text from 3)", sa.idstudyattachment),
          document_name: sa.name,
          document_type: fragment("CASE WHEN ? NOT IN ('jpg', 'jpeg', 'png') THEN 'attachment' ELSE 'url' END", sa.format),
          url: fragment(
            "concat(?::text, ?::text, substring(encrypt(?::text::bytea, '1nf0rm3', 'aes')::text from 3))",
            ^domain,
            "/api/attachment/",
            sa.idstudyattachment
          ),
          patientname: p.patientname,
          proceduredescription: s.studydescription,
          studydate: fragment("TO_CHAR(?, 'YYYY-MM-DD')", s.studydate),
          studytime: fragment("TO_CHAR(?, 'HH24:MI:SS')", s.studytime),
          accessionnumber: s.accessionnumber,
          patientid: ""
        }

    # Si no encontró informes, ni adjuntos, ni nada
    # se traen sólo los datos básicos del estudio
    basicquery =
      from s in "study",
        join: p in "patient", on: p.idpatient == s.idpatient,
        where: s.idstudy == ^id_study,
        select: %{
          idsite: type(^idsite, :integer),
          patientname: p.patientname,
          proceduredescription: s.studydescription,
          studydate: fragment("TO_CHAR(?, 'YYYY-MM-DD')", s.studydate),
          studytime: fragment("TO_CHAR(?, 'HH24:MI:SS')", s.studytime),
          accessionnumber: s.accessionnumber,
          patientid: ""
        }


    combined_query =
      from q in subquery1,
        union_all: ^subquery2,
        union_all: ^subquery3,
        select: q

    results = Repo.all(combined_query)
    case results do
      [] -> Repo.all(from q in basicquery)
      _ -> results
    end
  end
end