asmr_video_generator

defmodule AsmrVideoGenerator do
  @moduledoc """
  This module provides functions for generating ASMR videos using Supermaker AI.
  It includes utilities for constructing URLs and manipulating video parameters.
  """

  @base_url "https://supermaker.ai/video/asmr-video-generator"

  @doc """
  Builds a URL to the ASMR video generator with optional parameters.

  ## Examples

      iex> AsmrVideoGenerator.build_url()
      "https://supermaker.ai/video/asmr-video-generator"

      iex> AsmrVideoGenerator.build_url(prompt: "Gentle rain", duration: 60)
      "https://supermaker.ai/video/asmr-video-generator?prompt=Gentle rain&duration=60"
  """
  def build_url(params \\ []) when is_list(params) do
    @base_url
    |> maybe_append_params(params)
  end

  defp maybe_append_params(base_url, []), do: base_url

  defp maybe_append_params(base_url, params) when is_list(params) do
    params
    |> Enum.reject(fn {_, value} -> is_nil(value) end)
    |> Enum.map(fn {key, value} -> "#{key}=#{URI.encode(to_string(value))}" end)
    |> Enum.join("&")
    |> then(fn param_string ->
      case param_string do
        "" -> base_url
        _ -> "#{base_url}?#{param_string}"
      end
    end)
  end

  @doc """
  Generates a default prompt for an ASMR video based on a theme.

  ## Examples

      iex> AsmrVideoGenerator.generate_prompt("Nature")
      "Relaxing nature sounds for sleep and meditation."

      iex> AsmrVideoGenerator.generate_prompt("Rain")
      "Gentle rain sounds for focus and relaxation."
  """
  def generate_prompt("Nature"), do: "Relaxing nature sounds for sleep and meditation."
  def generate_prompt("Rain"), do: "Gentle rain sounds for focus and relaxation."
  def generate_prompt("Fire"), do: "Crackling fireplace sounds for warmth and comfort."
  def generate_prompt(_), do: "Calming ASMR sounds for relaxation."

  @doc """
  Normalizes a duration in seconds to a valid range (30-300 seconds).

  ## Examples

      iex> AsmrVideoGenerator.normalize_duration(15)
      30

      iex> AsmrVideoGenerator.normalize_duration(180)
      180

      iex> AsmrVideoGenerator.normalize_duration(400)
      300
  """
  def normalize_duration(duration) when is_integer(duration) do
    cond do
      duration < 30 -> 30
      duration > 300 -> 300
      true -> duration
    end
  end

  @doc """
  Converts a list of keywords into a comma-separated string for use in prompts.

  ## Examples

      iex> AsmrVideoGenerator.keywords_to_string(["whispering", "tapping"])
      "whispering, tapping"

      iex> AsmrVideoGenerator.keywords_to_string([])
      ""
  """
  def keywords_to_string(keywords) when is_list(keywords) do
    keywords
    |> Enum.map(&to_string/1)
    |> Enum.join(", ")
  end
end