# frozen_string_literal: true

# typed: true

require "json"

# Class to build Swagger json description of entities
class SwaggerBuilder
  class << self
    def build_swagger_for(models, host_with_port)
      doc = {}
      doc["swagger"] = "2.0"
      doc["info"] = build_info(models)
      doc["host"] = host_with_port
      doc["schemes"] = "http"
      doc["basePath"] = "/#{ENV["base_path"]}"
      doc["paths"] = generate_paths_for models
      JSON.generate(doc)
    end

    def build_info(models)
      info = {}
      info["description"] = "Schemaless REST API providing
	  CRUD for #{models.keys.length} models: #{models.keys.join("\n")}"
      info
    end

    def generate_paths_for(models)
      paths = { "/" => summary }
      models.each_key do |model|
        paths["/#{model.downcase}"] = model_paths(model)
        paths["/#{model.downcase}/{modelId}"] = paths_at_id(model)
      end
      paths
    end

    def summary
      {
        get: {
          responses: {
            "200": {
              "description": "Basic basic summary of API - could be used as health check"
            }
          }
        }
      }
    end

    def model_paths(model)
      {
        post: {
          parameters: any_json_request,
          responses: {
            "201": {
              "description": "Response with id of created #{model}"
            }
          }
        },
        get: {
          parameters: [
            {
              name: "params",
              description: "Any key can be used to filter #{model} by",
              schema: {
                type: "object",
                # If the parameter values are of specific type, e.g. string:
                additionalProperties: {
                  type: "string"
                }
              }
            }
          ],
          responses: {
            "200": {
              "description": "List of all #{model} objects"
            }
          }
        }
      }
    end

    def any_json_request
      [
        {
          "description": "Arbitrary JSON object payload",
          "in": "body",
          "name": "body",
          "required": true,
          "schema": {
            "type": "object"
          }
        }
      ]
    end

    def paths_at_id(model)
      {
        get: {
          description: "Data of #{model} at passed id",
          parameters: id_params(model),
          responses: {
            "200": {
              "description": "Data of #{model} requested"
            },
            "404": {
              "description": "#{model} not found"
            }
          }
        },
        put: {
          description: "Update id of #{model} to be provided data",
          parameters: [
            {
              "description": "Arbitrary JSON object payload",
              "in": "body",
              "name": "body",
              "required": true,
              "schema": {
                "type": "object"
              }
            },
            {
              "name": "modelId",
              "in": "path",
              "description": "ID of #{model} to update",
              "required": true,
              "type": "string"
            }
          ],
          responses: {
            "204": {
              "description": "Response"
            },
            "404": {
              "description": "#{model} not found"
            }
          }
        },
        delete: {
          description: "Delete #{model} at passed id",
          parameters: id_params(model),
          responses: {
            "204": {
              "description": "Response"
            },
            "404": {
              "description": "#{model} not found"
            }
          }
        }
      }
    end

    def id_params(model)
      [
        {
          "name": "modelId",
          "in": "path",
          "description": "ID of #{model} to return",
          "required": true,
          "type": "string"
        }
      ]
    end
  end
end