defmodule Aigptimage do
  @moduledoc """
  Small helpers for linking to AI GPT Image and building public API requests.

  [AI GPT Image](https://aigptimage.com/) provides AI image generation,
  editing, API, and MCP workflows, including GPT Image 2 style image generation
  helpers for creators and developers.
  """

  @base_url "https://aigptimage.com"
  @default_image_model "gpt-image-2-text-to-image"

  @doc """
  Returns the AI GPT Image homepage URL.

  ## Examples

      iex> Aigptimage.homepage_url()
      "https://aigptimage.com/"

  """
  def homepage_url do
    @base_url <> "/"
  end

  @doc """
  Returns public metadata for AI GPT Image.

  ## Examples

      iex> Aigptimage.metadata().default_image_model
      "gpt-image-2-text-to-image"

  """
  def metadata do
    %{
      name: "AI GPT Image",
      slug: "aigptimage",
      url: homepage_url(),
      description:
        "AI image generation and editing helpers for GPT Image 2 style workflows, prompt examples, API automation, and MCP integrations.",
      category: "AI Image Generator",
      contact_email: "support@aigptimage.com",
      default_image_model: @default_image_model
    }
  end

  @doc """
  Returns the public createTask API URL.

  ## Examples

      iex> Aigptimage.api_create_task_url()
      "https://aigptimage.com/api/v1/jobs/createTask"

  """
  def api_create_task_url(base_url \\ @base_url) when is_binary(base_url) do
    clean_base_url(base_url) <> "/api/v1/jobs/createTask"
  end

  @doc """
  Returns the public recordInfo API URL for a task id.

  ## Examples

      iex> Aigptimage.api_record_info_url("task 123")
      "https://aigptimage.com/api/v1/jobs/recordInfo?taskId=task%20123"

  """
  def api_record_info_url(task_id, base_url \\ @base_url)
      when is_binary(task_id) and is_binary(base_url) do
    id = String.trim(task_id)

    if id == "" do
      raise ArgumentError, "task_id is required"
    end

    clean_base_url(base_url) <> "/api/v1/jobs/recordInfo?taskId=" <> URI.encode(id)
  end

  @doc """
  Returns the MCP endpoint URL.

  ## Examples

      iex> Aigptimage.mcp_url()
      "https://aigptimage.com/api/mcp"

  """
  def mcp_url(base_url \\ @base_url) when is_binary(base_url) do
    clean_base_url(base_url) <> "/api/mcp"
  end

  @doc """
  Builds a createTask request body for GPT Image 2 style image generation.

  ## Examples

      iex> Aigptimage.build_create_task_body("A clean ecommerce product photo")
      %{model: "gpt-image-2-text-to-image", input: %{prompt: "A clean ecommerce product photo"}}

  """
  def build_create_task_body(prompt, opts \\ []) when is_binary(prompt) and is_list(opts) do
    text = String.trim(prompt)

    if text == "" do
      raise ArgumentError, "prompt is required"
    end

    model = Keyword.get(opts, :model, @default_image_model)
    input = Keyword.get(opts, :input, %{}) |> Map.put(:prompt, text)
    body = %{model: model, input: input}

    case Keyword.get(opts, :call_back_url) do
      nil -> body
      url -> Map.put(body, :callBackUrl, url)
    end
  end

  @doc """
  Returns Bearer authorization headers for API requests.

  ## Examples

      iex> Aigptimage.bearer_headers("key").authorization
      "Bearer key"

  """
  def bearer_headers(api_key) when is_binary(api_key) do
    key = String.trim(api_key)

    if key == "" do
      raise ArgumentError, "api_key is required"
    end

    %{
      authorization: "Bearer " <> key,
      content_type: "application/json"
    }
  end

  @doc """
  Returns a Markdown link to AI GPT Image.

  ## Examples

      iex> Aigptimage.markdown_link()
      "[AI GPT Image](https://aigptimage.com/)"

  """
  def markdown_link(label \\ "AI GPT Image") when is_binary(label) do
    "[#{String.trim(label)}](#{homepage_url()})"
  end

  defp clean_base_url(base_url) do
    String.trim_trailing(base_url, "/")
  end
end