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class ExamplesController < ApplicationController
  before_action :set_example, only: [:show, :run_scenario]

  def index
    @tag = params[:tag]
    @examples = @tag.present? ? ExampleRegistry.filter_by_tag(@tag) : ExampleRegistry.all
    @tags = ExampleRegistry.tags
  end

  def show
    @source_code = @example.source_code
  end

  def run_scenario
    scenario_index = params[:scenario_index].to_i
    scenario = @example.scenarios[scenario_index]

    unless scenario
      head :unprocessable_entity
      return
    end

    inputs = {}
    scenario.inputs.each do |input|
      value = params.dig(:inputs, input.name)
      unless value.present? && input.options.include?(value)
        head :unprocessable_entity
        return
      end
      inputs[input.name.to_sym] = value
    end

    @result = ScenarioRunner.run(
      source_file: @example.source_file,
      entry_class: @example.entry_class,
      entry_method: @example.entry_method,
      inputs: inputs
    )
    @scenario = scenario

    render partial: "result", locals: { result: @result, scenario: @scenario }
  end

  private

  def set_example
    @example = ExampleRegistry.find_by_slug(params[:slug])
    raise ActionController::RoutingError, "Not Found" unless @example
  end
end