defmodule SettlementSimulator.Controllers.SettlementControllerTest do
  use ExUnit.Case

  doctest SettlementSimulator.Controllers.SettlementController

  setup do
    {:ok, %{}}
  end

  test "successful settlement with valid merchant tag from database" do
    # This test assumes merchant with code AE_REST_001 exists in the merchants table
    request_body = Jason.encode!(%{
      "type" => "qr_payment_settlement_summary",
      "merchantTag" => "AE_REST_001",
      "bankUserId" => "Mercury_UAE_PARTNER_001",
      "settlementDate" => "2026-06-11",
      "totalTransactionCount" => "3",
      "grossSettlementAmount" => %{
        "value" => "66.00",
        "currency" => "AED"
      },
      "mdrCharges" => %{
        "value" => "0.33",
        "currency" => "AED"
      },
      "taxOnMdr" => %{
        "value" => "0.06",
        "currency" => "AED"
      },
      "netSettlementAmount" => %{
        "value" => "65.61",
        "currency" => "AED"
      },
      "settlementTimestamp" => "2026-06-11T21:29:59+04:00"
    })

    conn =
      :post
      |> Plug.Test.conn("/api/v1/upi/settlement-summary", request_body)
      |> Plug.Test.put_req_header("authorization", "Bearer jfx2ozaJQpszIuek2b5NHagH93Z61sNVk_lYTWyVAlk")
      |> Plug.Test.put_req_header("content-type", "application/json")

    response = SettlementSimulator.Controllers.SettlementController.handle_settlement_summary(conn)

    assert response.status == 200
    {:ok, body} = Jason.decode(response.resp_body)
    assert body["settlementStatus"] == "COMPLETED"
    assert body["mismatchDetected"] == false
  end

  test "successful settlement with merchant tag without underscores" do
    # AEREST001 should match AE_REST_001 in database
    request_body = Jason.encode!(%{
      "type" => "qr_payment_settlement_summary",
      "merchantTag" => "AEREST001",
      "bankUserId" => "Mercury_UAE_PARTNER_001",
      "settlementDate" => "2026-06-11",
      "totalTransactionCount" => "3",
      "grossSettlementAmount" => %{
        "value" => "66.00",
        "currency" => "AED"
      }
    })

    conn =
      :post
      |> Plug.Test.conn("/api/v1/upi/settlement-summary", request_body)
      |> Plug.Test.put_req_header("authorization", "Bearer jfx2ozaJQpszIuek2b5NHagH93Z61sNVk_lYTWyVAlk")
      |> Plug.Test.put_req_header("content-type", "application/json")

    response = SettlementSimulator.Controllers.SettlementController.handle_settlement_summary(conn)

    assert response.status == 200
    {:ok, body} = Jason.decode(response.resp_body)
    assert body["settlementStatus"] == "COMPLETED"
  end

  test "failure response when merchant not found in database" do
    request_body = Jason.encode!(%{
      "type" => "qr_payment_settlement_summary",
      "merchantTag" => "INVALID_MERCHANT",
      "bankUserId" => "Mercury_UAE_PARTNER_001",
      "settlementDate" => "2026-06-11",
      "totalTransactionCount" => "3",
      "grossSettlementAmount" => %{
        "value" => "66.00",
        "currency" => "AED"
      }
    })

    conn =
      :post
      |> Plug.Test.conn("/api/v1/upi/settlement-summary", request_body)
      |> Plug.Test.put_req_header("authorization", "Bearer jfx2ozaJQpszIuek2b5NHagH93Z61sNVk_lYTWyVAlk")
      |> Plug.Test.put_req_header("content-type", "application/json")

    response = SettlementSimulator.Controllers.SettlementController.handle_settlement_summary(conn)

    assert response.status == 404
    {:ok, body} = Jason.decode(response.resp_body)
    assert body["settlementStatus"] == "FAILED"
    assert body["mismatchDetected"] == true
    assert body["error"] == "Merchant not found"
  end

  test "unauthorized when bearer token missing" do
    request_body = Jason.encode!(%{
      "merchantTag" => "AE_REST_001",
      "bankUserId" => "Mercury_UAE_PARTNER_001",
      "settlementDate" => "2026-06-11",
      "grossSettlementAmount" => %{
        "value" => "66.00",
        "currency" => "AED"
      }
    })

    conn =
      :post
      |> Plug.Test.conn("/api/v1/upi/settlement-summary", request_body)
      |> Plug.Test.put_req_header("content-type", "application/json")

    response = SettlementSimulator.Controllers.SettlementController.handle_settlement_summary(conn)

    assert response.status == 401
    {:ok, body} = Jason.decode(response.resp_body)
    assert body["message"] == "Unauthorized"
  end

  test "missing required fields validation" do
    request_body = Jason.encode!(%{
      "merchantTag" => "AE_REST_001"
    })

    conn =
      :post
      |> Plug.Test.conn("/api/v1/upi/settlement-summary", request_body)
      |> Plug.Test.put_req_header("authorization", "Bearer jfx2ozaJQpszIuek2b5NHagH93Z61sNVk_lYTWyVAlk")
      |> Plug.Test.put_req_header("content-type", "application/json")

    response = SettlementSimulator.Controllers.SettlementController.handle_settlement_summary(conn)

    assert response.status == 400
    {:ok, body} = Jason.decode(response.resp_body)
    assert body["message"] == "Validation failed"
    assert is_list(body["errors"])
  end
end