defmodule Simpleshop.Printify.Client do
  require Logger
  alias Simpleshop.Printify.TokenStore

  @base_url "https://api.printify.com/v1"
  @user_agent "SimpleshopMVP"

  def get_products do
    config = Application.get_env(:simpleshop, :printify)
    shop_id = Keyword.fetch!(config, :shop_id)
    url = "#{@base_url}/shops/#{shop_id}/products.json"

    with_token(fn token ->
      case Req.get(url, headers: headers(token)) do
        {:ok, %{status: 200, body: response}} ->
          products = Map.get(response, "data") || response
          Logger.info("Successfully fetched #{length(products)} products")
          {:ok, products}

        {:ok, %{status: status, body: body}} ->
          Logger.error("Failed to fetch products: #{status} - #{inspect(body)}")
          {:error, "Failed to fetch products: #{status}"}

        {:error, error} ->
          Logger.error("HTTP error fetching products: #{inspect(error)}")
          {:error, "Network error: #{inspect(error)}"}
      end
    end)
  end

  def get_product(product_id) do
    config = Application.get_env(:simpleshop, :printify)
    shop_id = Keyword.fetch!(config, :shop_id)
    url = "#{@base_url}/shops/#{shop_id}/products/#{product_id}.json"

    with_token(fn token ->
      case Req.get(url, headers: headers(token)) do
        {:ok, %{status: 200, body: product}} ->
          Logger.info("Successfully fetched product #{product_id}")
          {:ok, product}

        {:ok, %{status: status, body: body}} ->
          Logger.error("Failed to fetch product: #{status} - #{inspect(body)}")
          {:error, "Failed to fetch product: #{status}"}

        {:error, error} ->
          Logger.error("HTTP error fetching product: #{inspect(error)}")
          {:error, "Network error: #{inspect(error)}"}
      end
    end)
  end

  def create_order(product_id, variant_id, quantity \\ 1) do
    config = Application.get_env(:simpleshop, :printify)
    shop_id = Keyword.fetch!(config, :shop_id)
    url = "#{@base_url}/shops/#{shop_id}/orders.json"

    order_data = %{
      external_id: "simpleshop-#{System.unique_integer([:positive])}",
      line_items: [
        %{
          product_id: product_id,
          variant_id: variant_id,
          quantity: quantity
        }
      ],
      shipping_method: 1,
      address_to: test_shipping_address()
    }

    with_token(fn token ->
      case Req.post(url, headers: headers(token), json: order_data) do
        {:ok, %{status: status, body: response}} when status in 200..299 ->
          Logger.info("Successfully created order: #{inspect(response)}")
          {:ok, response}

        {:ok, %{status: status, body: body}} ->
          Logger.error("Failed to create order: #{status} - #{inspect(body)}")
          {:error, "Failed to create order: #{status} - #{inspect(body)}"}

        {:error, error} ->
          Logger.error("HTTP error creating order: #{inspect(error)}")
          {:error, "Network error: #{inspect(error)}"}
      end
    end)
  end

  defp with_token(fun) do
    case TokenStore.get_access_token() do
      {:ok, token} ->
        fun.(token)

      {:error, :not_configured} ->
        Logger.error("Printify Personal Access Token not configured in config/dev.exs")
        {:error, :not_configured}

      {:error, reason} ->
        Logger.error("Failed to get access token: #{inspect(reason)}")
        {:error, :authentication_required}
    end
  end

  defp headers(token) do
    [
      {"Authorization", "Bearer #{token}"},
      {"User-Agent", @user_agent},
      {"Content-Type", "application/json;charset=utf-8"}
    ]
  end

  defp test_shipping_address do
    %{
      first_name: "John",
      last_name: "Doe",
      email: "test@example.com",
      phone: "555-0123",
      country: "US",
      region: "CA",
      address1: "123 Test St",
      city: "San Francisco",
      zip: "94102"
    }
  end
end