mod unit {
    use crank_core::HttpMethod;
    use crank_import::rest::preview_document;

    const OPENAPI3: &str = r#"
openapi: 3.0.3
info:
  title: Frankfurter API
servers:
  - url: https://api.frankfurter.dev
paths:
  /v2/latest:
    get:
      operationId: getLatestRates
      summary: Получить последние курсы
      description: Возвращает последние курсы валют для базовой валюты.
      tags: [currency]
      parameters:
        - name: base
          in: query
          required: true
          schema:
            type: string
        - name: symbols
          in: query
          schema:
            type: string
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                required: [amount, base]
                properties:
                  amount:
                    type: number
                  base:
                    type: string
"#;

    const SWAGGER2: &str = r#"
swagger: "2.0"
info:
  title: Pet API
host: petstore.example.com
basePath: /api
schemes: [https]
paths:
  /pets/{id}:
    get:
      operationId: getPet
      summary: Получить питомца
      tags: [pets]
      parameters:
        - name: id
          in: path
          required: true
          type: string
      responses:
        '200':
          description: OK
          schema:
            $ref: '#/definitions/Pet'
definitions:
  Pet:
    type: object
    required: [id, name]
    properties:
      id:
        type: string
      name:
        type: string
"#;

    #[test]
    fn previews_openapi3_rest_operations_grouped_by_tag() {
        let preview = preview_document(OPENAPI3).unwrap();

        assert_eq!(preview.source.format, "openapi");
        assert_eq!(preview.source.servers, vec!["https://api.frankfurter.dev"]);
        assert_eq!(preview.groups.len(), 1);
        assert_eq!(preview.groups[0].key, "currency");
        let operation = &preview.groups[0].operations[0];
        assert_eq!(operation.method, HttpMethod::Get);
        assert_eq!(operation.suggested_name, "get_latest_rates");
        assert_eq!(operation.input_fields, 2);
        assert_eq!(operation.output_fields, 2);
        assert_eq!(operation.draft.target.path_template, "/v2/latest");
        assert_eq!(operation.draft.input_mapping.rules.len(), 2);
    }

    #[test]
    fn previews_swagger2_and_resolves_definitions() {
        let preview = preview_document(SWAGGER2).unwrap();

        assert_eq!(preview.source.format, "swagger");
        assert_eq!(
            preview.source.servers,
            vec!["https://petstore.example.com/api"]
        );
        let operation = &preview.groups[0].operations[0];
        assert_eq!(operation.suggested_name, "get_pet");
        assert_eq!(operation.input_fields, 1);
        assert_eq!(operation.output_fields, 2);
        assert_eq!(operation.draft.target.path_template, "/pets/{id}");
        assert_eq!(
            operation.draft.input_mapping.rules[0].target,
            "$.request.path.id"
        );
    }

    #[test]
    fn reports_missing_descriptions_as_recommendations() {
        let document = r#"
openapi: 3.0.3
info: { title: Minimal API }
paths:
  /items:
    get:
      responses:
        '204': { description: Empty }
"#;

        let preview = preview_document(document).unwrap();
        let operation = &preview.groups[0].operations[0];
        let codes = operation
            .findings
            .iter()
            .map(|finding| finding.code.as_str())
            .collect::<Vec<_>>();

        assert!(codes.contains(&"missing_operation_id"));
        assert!(codes.contains(&"missing_summary"));
        assert!(codes.contains(&"missing_description"));
        assert!(codes.contains(&"missing_response_schema"));
    }

    #[test]
    fn expands_json_request_body_object_into_tool_inputs() {
        let document = r#"
openapi: 3.0.3
info: { title: CRM API }
servers:
  - url: https://crm.example.test
paths:
  /leads:
    post:
      operationId: createLead
      summary: Создать лид
      description: Создает лид в CRM.
      tags: [crm]
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required: [email]
              properties:
                email: { type: string }
                name: { type: string }
      responses:
        '201':
          description: Created
          content:
            application/json:
              schema:
                type: object
                properties:
                  id: { type: string }
"#;

        let preview = preview_document(document).unwrap();
        let operation = &preview.groups[0].operations[0];
        let input_fields = &operation.draft.input_schema.fields;
        let targets = operation
            .draft
            .input_mapping
            .rules
            .iter()
            .map(|rule| rule.target.as_str())
            .collect::<Vec<_>>();

        assert!(input_fields.contains_key("email"));
        assert!(input_fields.contains_key("name"));
        assert!(targets.contains(&"$.request.body.email"));
        assert!(targets.contains(&"$.request.body.name"));
    }

    #[test]
    fn reports_tool_quality_recommendations_for_imported_operations() {
        let document = r#"
openapi: 3.0.3
info: { title: Wide API }
paths:
  /items:
    get:
      operationId: getItems
      summary: Get items
      description: Get items.
      parameters:
        - name: page
          in: query
          schema: { type: integer }
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                properties:
                  field01: { type: string }
                  field02: { type: string }
                  field03: { type: string }
                  field04: { type: string }
                  field05: { type: string }
                  field06: { type: string }
                  field07: { type: string }
                  field08: { type: string }
                  field09: { type: string }
                  field10: { type: string }
                  field11: { type: string }
                  field12: { type: string }
                  field13: { type: string }
"#;

        let preview = preview_document(document).unwrap();
        let operation = &preview.groups[0].operations[0];
        let codes = operation
            .findings
            .iter()
            .map(|finding| finding.code.as_str())
            .collect::<Vec<_>>();

        assert!(codes.contains(&"parameter_descriptions_missing"));
        assert!(codes.contains(&"weak_tool_description"));
        assert!(codes.contains(&"weak_tool_name"));
        assert!(codes.contains(&"too_many_output_fields"));
    }
}