# Script to demonstrate how merchant-specific MF919 overlay values should be
# applied as DeviceParameterOverride records for a specific terminal.
#
# This script sets MERCHANT_ID, TERMINAL_ID, and BATCH_NO from
# default_merchants.properties as per-terminal overrides rather than embedding
# them into the shared default template.
#
# Run with: mix run priv/repo/seeds/mf919_merchant_overlay.exs
#
# Prerequisites:
#   1. mf919_parameter_categories.exs
#   2. mf919_parameter_definitions.exs
#   3. The terminal referenced by SAMPLE_TERMINAL_ID must exist in the database.
#
# Usage:
#   SAMPLE_TERMINAL_ID=<your_terminal_id> mix run priv/repo/seeds/mf919_merchant_overlay.exs
#   OR edit the @sample_terminal_id value below for a quick test.

Mix.Task.run("app.start")
require Logger

alias DaProductApp.Repo
alias DaProductApp.ParameterManagement.{ParameterDefinition, DeviceParameterOverride}

# ---------------------------------------------------------------------------
# Target terminal – override via environment variable or set directly here.
# ---------------------------------------------------------------------------
sample_terminal_id =
  case System.get_env("SAMPLE_TERMINAL_ID") do
    nil ->
      Logger.warning("SAMPLE_TERMINAL_ID not set; using placeholder terminal_id = 1")
      1

    val ->
      case Integer.parse(val) do
        {id, ""} ->
          id

        _ ->
          Logger.error("SAMPLE_TERMINAL_ID is not a valid integer: #{val}")
          System.halt(1)
      end
  end

# ---------------------------------------------------------------------------
# Overlay values from default_merchants.properties
# ---------------------------------------------------------------------------
overlay_values = [
  {"MERCHANT_ID", "123456789012345"},
  {"TERMINAL_ID", "12345679"},
  {"BATCH_NO", "000001"}
]

Enum.each(overlay_values, fn {key, value} ->
  case Repo.get_by(ParameterDefinition, key: key) do
    nil ->
      Logger.warning("Parameter definition not found for key: #{key} – skipping")

    param_def ->
      existing =
        Repo.get_by(DeviceParameterOverride,
          terminal_id: sample_terminal_id,
          parameter_definition_id: param_def.id
        )

      case existing do
        nil ->
          changeset =
            DeviceParameterOverride.changeset(%DeviceParameterOverride{}, %{
              terminal_id: sample_terminal_id,
              parameter_definition_id: param_def.id,
              value: value,
              source: "manual"
            })

          case Repo.insert(changeset) do
            {:ok, override} ->
              Logger.info(
                "Created override: terminal=#{sample_terminal_id} #{key}=#{value} (ID: #{override.id})"
              )

            {:error, reason} ->
              Logger.error("Failed to create override #{key}: #{inspect(reason)}")
          end

        ov ->
          Logger.info(
            "Override already exists: terminal=#{sample_terminal_id} #{key}=#{ov.value} (ID: #{ov.id})"
          )
      end
  end
end)

Logger.info("MF919 merchant overlay seeding completed for terminal ID: #{sample_terminal_id}")