ValidationError.js

const { stringHints, numberHints } = require("./util/hints");

/** @typedef {import("json-schema").JSONSchema6} JSONSchema6 */
/** @typedef {import("json-schema").JSONSchema7} JSONSchema7 */

/** @typedef {import("./validate").Schema} Schema */
/** @typedef {import("./validate").ValidationErrorConfiguration} ValidationErrorConfiguration */
/** @typedef {import("./validate").PostFormatter} PostFormatter */
/** @typedef {import("./validate").SchemaUtilErrorObject} SchemaUtilErrorObject */

/** @enum {number} */
const SPECIFICITY = {
  type: 1,
  not: 1,
  oneOf: 1,
  anyOf: 1,
  if: 1,
  enum: 1,
  const: 1,
  instanceof: 1,
  required: 2,
  pattern: 2,
  patternRequired: 2,
  format: 2,
  formatMinimum: 2,
  formatMaximum: 2,
  minimum: 2,
  exclusiveMinimum: 2,
  maximum: 2,
  exclusiveMaximum: 2,
  multipleOf: 2,
  uniqueItems: 2,
  contains: 2,
  minLength: 2,
  maxLength: 2,
  minItems: 2,
  maxItems: 2,
  minProperties: 2,
  maxProperties: 2,
  dependencies: 2,
  propertyNames: 2,
  additionalItems: 2,
  additionalProperties: 2,
  absolutePath: 2,
};

/**
 * @param {string} value
 * @returns {value is number}
 */
function isNumeric(value) {
  return /^-?\d+$/.test(value);
}

/**
 *
 * @param {Array<SchemaUtilErrorObject>} array
 * @param {(item: SchemaUtilErrorObject) => number} fn
 * @returns {Array<SchemaUtilErrorObject>}
 */
function filterMax(array, fn) {
  const evaluatedMax = array.reduce((max, item) => Math.max(max, fn(item)), 0);

  return array.filter((item) => fn(item) === evaluatedMax);
}

/**
 *
 * @param {Array<SchemaUtilErrorObject>} children
 * @returns {Array<SchemaUtilErrorObject>}
 */
function filterChildren(children) {
  let newChildren = children;

  newChildren = filterMax(
    newChildren,
    /**
     *
     * @param {SchemaUtilErrorObject} error
     * @returns {number}
     */
    (error) => (error.instancePath ? error.instancePath.length : 0)
  );
  newChildren = filterMax(
    newChildren,
    /**
     * @param {SchemaUtilErrorObject} error
     * @returns {number}
     */
    (error) =>
      SPECIFICITY[/** @type {keyof typeof SPECIFICITY} */ (error.keyword)] || 2
  );

  return newChildren;
}

/**
 * Find all children errors
 * @param {Array<SchemaUtilErrorObject>} children
 * @param {Array<string>} schemaPaths
 * @return {number} returns index of first child
 */
function findAllChildren(children, schemaPaths) {
  let i = children.length - 1;
  const predicate =
    /**
     * @param {string} schemaPath
     * @returns {boolean}
     */
    (schemaPath) => children[i].schemaPath.indexOf(schemaPath) !== 0;

  while (i > -1 && !schemaPaths.every(predicate)) {
    if (children[i].keyword === "anyOf" || children[i].keyword === "oneOf") {
      const refs = extractRefs(children[i]);
      const childrenStart = findAllChildren(
        children.slice(0, i),
        refs.concat(children[i].schemaPath)
      );

      i = childrenStart - 1;
    } else {
      i -= 1;
    }
  }

  return i + 1;
}

/**
 * Extracts all refs from schema
 * @param {SchemaUtilErrorObject} error
 * @return {Array<string>}
 */
function extractRefs(error) {
  const { schema } = error;

  if (!Array.isArray(schema)) {
    return [];
  }

  return schema.map(({ $ref }) => $ref).filter((s) => s);
}

/**
 * Groups children by their first level parent (assuming that error is root)
 * @param {Array<SchemaUtilErrorObject>} children
 * @return {Array<SchemaUtilErrorObject>}
 */
function groupChildrenByFirstChild(children) {
  const result = [];
  let i = children.length - 1;

  while (i > 0) {
    const child = children[i];

    if (child.keyword === "anyOf" || child.keyword === "oneOf") {
      const refs = extractRefs(child);
      const childrenStart = findAllChildren(
        children.slice(0, i),
        refs.concat(child.schemaPath)
      );

      if (childrenStart !== i) {
        result.push(
          Object.assign({}, child, {
            children: children.slice(childrenStart, i),
          })
        );
        i = childrenStart;
      } else {
        result.push(child);
      }
    } else {
      result.push(child);
    }

    i -= 1;
  }

  if (i === 0) {
    result.push(children[i]);
  }

  return result.reverse();
}

/**
 * @param {string} str
 * @param {string} prefix
 * @returns {string}
 */
function indent(str, prefix) {
  return str.replace(/\n(?!$)/g, `\n${prefix}`);
}

/**
 * @param {Schema} schema
 * @returns {schema is (Schema & {not: Schema})}
 */
function hasNotInSchema(schema) {
  return !!schema.not;
}

/**
 * @param {Schema} schema
 * @return {Schema}
 */
function findFirstTypedSchema(schema) {
  if (hasNotInSchema(schema)) {
    return findFirstTypedSchema(schema.not);
  }

  return schema;
}

/**
 * @param {Schema} schema
 * @return {boolean}
 */
function canApplyNot(schema) {
  const typedSchema = findFirstTypedSchema(schema);

  return (
    likeNumber(typedSchema) ||
    likeInteger(typedSchema) ||
    likeString(typedSchema) ||
    likeNull(typedSchema) ||
    likeBoolean(typedSchema)
  );
}

/**
 * @param {any} maybeObj
 * @returns {boolean}
 */
function isObject(maybeObj) {
  return typeof maybeObj === "object" && maybeObj !== null;
}

/**
 * @param {Schema} schema
 * @returns {boolean}
 */
function likeNumber(schema) {
  return (
    schema.type === "number" ||
    typeof schema.minimum !== "undefined" ||
    typeof schema.exclusiveMinimum !== "undefined" ||
    typeof schema.maximum !== "undefined" ||
    typeof schema.exclusiveMaximum !== "undefined" ||
    typeof schema.multipleOf !== "undefined"
  );
}

/**
 * @param {Schema} schema
 * @returns {boolean}
 */
function likeInteger(schema) {
  return (
    schema.type === "integer" ||
    typeof schema.minimum !== "undefined" ||
    typeof schema.exclusiveMinimum !== "undefined" ||
    typeof schema.maximum !== "undefined" ||
    typeof schema.exclusiveMaximum !== "undefined" ||
    typeof schema.multipleOf !== "undefined"
  );
}

/**
 * @param {Schema} schema
 * @returns {boolean}
 */
function likeString(schema) {
  return (
    schema.type === "string" ||
    typeof schema.minLength !== "undefined" ||
    typeof schema.maxLength !== "undefined" ||
    typeof schema.pattern !== "undefined" ||
    typeof schema.format !== "undefined" ||
    typeof schema.formatMinimum !== "undefined" ||
    typeof schema.formatMaximum !== "undefined"
  );
}

/**
 * @param {Schema} schema
 * @returns {boolean}
 */
function likeBoolean(schema) {
  return schema.type === "boolean";
}

/**
 * @param {Schema} schema
 * @returns {boolean}
 */
function likeArray(schema) {
  return (
    schema.type === "array" ||
    typeof schema.minItems === "number" ||
    typeof schema.maxItems === "number" ||
    typeof schema.uniqueItems !== "undefined" ||
    typeof schema.items !== "undefined" ||
    typeof schema.additionalItems !== "undefined" ||
    typeof schema.contains !== "undefined"
  );
}

/**
 * @param {Schema & {patternRequired?: Array<string>}} schema
 * @returns {boolean}
 */
function likeObject(schema) {
  return (
    schema.type === "object" ||
    typeof schema.minProperties !== "undefined" ||
    typeof schema.maxProperties !== "undefined" ||
    typeof schema.required !== "undefined" ||
    typeof schema.properties !== "undefined" ||
    typeof schema.patternProperties !== "undefined" ||
    typeof schema.additionalProperties !== "undefined" ||
    typeof schema.dependencies !== "undefined" ||
    typeof schema.propertyNames !== "undefined" ||
    typeof schema.patternRequired !== "undefined"
  );
}

/**
 * @param {Schema} schema
 * @returns {boolean}
 */
function likeNull(schema) {
  return schema.type === "null";
}

/**
 * @param {string} type
 * @returns {string}
 */
function getArticle(type) {
  if (/^[aeiou]/i.test(type)) {
    return "an";
  }

  return "a";
}

/**
 * @param {Schema=} schema
 * @returns {string}
 */
function getSchemaNonTypes(schema) {
  if (!schema) {
    return "";
  }

  if (!schema.type) {
    if (likeNumber(schema) || likeInteger(schema)) {
      return " | should be any non-number";
    }

    if (likeString(schema)) {
      return " | should be any non-string";
    }

    if (likeArray(schema)) {
      return " | should be any non-array";
    }

    if (likeObject(schema)) {
      return " | should be any non-object";
    }
  }

  return "";
}

/**
 * @param {Array<string>} hints
 * @returns {string}
 */
function formatHints(hints) {
  return hints.length > 0 ? `(${hints.join(", ")})` : "";
}

/**
 * @param {Schema} schema
 * @param {boolean} logic
 * @returns {string[]}
 */
function getHints(schema, logic) {
  if (likeNumber(schema) || likeInteger(schema)) {
    return numberHints(schema, logic);
  } else if (likeString(schema)) {
    return stringHints(schema, logic);
  }

  return [];
}

class ValidationError extends Error {
  /**
   * @param {Array<SchemaUtilErrorObject>} errors
   * @param {Schema} schema
   * @param {ValidationErrorConfiguration} configuration
   */
  constructor(errors, schema, configuration = {}) {
    super();

    /** @type {string} */
    this.name = "ValidationError";
    /** @type {Array<SchemaUtilErrorObject>} */
    this.errors = errors;
    /** @type {Schema} */
    this.schema = schema;

    let headerNameFromSchema;
    let baseDataPathFromSchema;

    if (schema.title && (!configuration.name || !configuration.baseDataPath)) {
      const splittedTitleFromSchema = schema.title.match(/^(.+) (.+)$/);

      if (splittedTitleFromSchema) {
        if (!configuration.name) {
          [, headerNameFromSchema] = splittedTitleFromSchema;
        }

        if (!configuration.baseDataPath) {
          [, , baseDataPathFromSchema] = splittedTitleFromSchema;
        }
      }
    }

    /** @type {string} */
    this.headerName = configuration.name || headerNameFromSchema || "Object";
    /** @type {string} */
    this.baseDataPath =
      configuration.baseDataPath || baseDataPathFromSchema || "configuration";

    /** @type {PostFormatter | null} */
    this.postFormatter = configuration.postFormatter || null;

    const header = `Invalid ${this.baseDataPath} object. ${
      this.headerName
    } has been initialized using ${getArticle(this.baseDataPath)} ${
      this.baseDataPath
    } object that does not match the API schema.\n`;

    /** @type {string} */
    this.message = `${header}${this.formatValidationErrors(errors)}`;

    Error.captureStackTrace(this, this.constructor);
  }

  /**
   * @param {string} path
   * @returns {Schema}
   */
  getSchemaPart(path) {
    const newPath = path.split("/");

    let schemaPart = this.schema;

    for (let i = 1; i < newPath.length; i++) {
      const inner = schemaPart[/** @type {keyof Schema} */ (newPath[i])];

      if (!inner) {
        break;
      }

      schemaPart = inner;
    }

    return schemaPart;
  }

  /**
   * @param {Schema} schema
   * @param {boolean} logic
   * @param {Array<Object>} prevSchemas
   * @returns {string}
   */
  formatSchema(schema, logic = true, prevSchemas = []) {
    let newLogic = logic;
    const formatInnerSchema =
      /**
       *
       * @param {Object} innerSchema
       * @param {boolean=} addSelf
       * @returns {string}
       */
      (innerSchema, addSelf) => {
        if (!addSelf) {
          return this.formatSchema(innerSchema, newLogic, prevSchemas);
        }

        if (prevSchemas.includes(innerSchema)) {
          return "(recursive)";
        }

        return this.formatSchema(
          innerSchema,
          newLogic,
          prevSchemas.concat(schema)
        );
      };

    if (hasNotInSchema(schema) && !likeObject(schema)) {
      if (canApplyNot(schema.not)) {
        newLogic = !logic;

        return formatInnerSchema(schema.not);
      }

      const needApplyLogicHere = !schema.not.not;
      const prefix = logic ? "" : "non ";
      newLogic = !logic;

      return needApplyLogicHere
        ? prefix + formatInnerSchema(schema.not)
        : formatInnerSchema(schema.not);
    }

    if (
      /** @type {Schema & {instanceof: string | Array<string>}} */ (schema)
        .instanceof
    ) {
      const { instanceof: value } =
        /** @type {Schema & {instanceof: string | Array<string>}} */ (schema);

      const values = !Array.isArray(value) ? [value] : value;

      return values
        .map(
          /**
           * @param {string} item
           * @returns {string}
           */
          (item) => (item === "Function" ? "function" : item)
        )
        .join(" | ");
    }

    if (schema.enum) {
      const enumValues = /** @type {Array<any>} */ (schema.enum)
        .map((item) => {
          if (item === null && schema.undefinedAsNull) {
            return `${JSON.stringify(item)} | undefined`;
          }

          return JSON.stringify(item);
        })
        .join(" | ");

      return `${enumValues}`;
    }

    if (typeof schema.const !== "undefined") {
      return JSON.stringify(schema.const);
    }

    if (schema.oneOf) {
      return /** @type {Array<Schema>} */ (schema.oneOf)
        .map((item) => formatInnerSchema(item, true))
        .join(" | ");
    }

    if (schema.anyOf) {
      return /** @type {Array<Schema>} */ (schema.anyOf)
        .map((item) => formatInnerSchema(item, true))
        .join(" | ");
    }

    if (schema.allOf) {
      return /** @type {Array<Schema>} */ (schema.allOf)
        .map((item) => formatInnerSchema(item, true))
        .join(" & ");
    }

    if (/** @type {JSONSchema7} */ (schema).if) {
      const {
        if: ifValue,
        then: thenValue,
        else: elseValue,
      } = /** @type {JSONSchema7} */ (schema);

      return `${ifValue ? `if ${formatInnerSchema(ifValue)}` : ""}${
        thenValue ? ` then ${formatInnerSchema(thenValue)}` : ""
      }${elseValue ? ` else ${formatInnerSchema(elseValue)}` : ""}`;
    }

    if (schema.$ref) {
      return formatInnerSchema(this.getSchemaPart(schema.$ref), true);
    }

    if (likeNumber(schema) || likeInteger(schema)) {
      const [type, ...hints] = getHints(schema, logic);
      const str = `${type}${hints.length > 0 ? ` ${formatHints(hints)}` : ""}`;

      return logic
        ? str
        : hints.length > 0
        ? `non-${type} | ${str}`
        : `non-${type}`;
    }

    if (likeString(schema)) {
      const [type, ...hints] = getHints(schema, logic);
      const str = `${type}${hints.length > 0 ? ` ${formatHints(hints)}` : ""}`;

      return logic
        ? str
        : str === "string"
        ? "non-string"
        : `non-string | ${str}`;
    }

    if (likeBoolean(schema)) {
      return `${logic ? "" : "non-"}boolean`;
    }

    if (likeArray(schema)) {
      // not logic already applied in formatValidationError
      newLogic = true;
      const hints = [];

      if (typeof schema.minItems === "number") {
        hints.push(
          `should not have fewer than ${schema.minItems} item${
            schema.minItems > 1 ? "s" : ""
          }`
        );
      }

      if (typeof schema.maxItems === "number") {
        hints.push(
          `should not have more than ${schema.maxItems} item${
            schema.maxItems > 1 ? "s" : ""
          }`
        );
      }

      if (schema.uniqueItems) {
        hints.push("should not have duplicate items");
      }

      const hasAdditionalItems =
        typeof schema.additionalItems === "undefined" ||
        Boolean(schema.additionalItems);
      let items = "";

      if (schema.items) {
        if (Array.isArray(schema.items) && schema.items.length > 0) {
          items = `${
            /** @type {Array<Schema>} */ (schema.items)
              .map((item) => formatInnerSchema(item))
              .join(", ")
          }`;

          if (hasAdditionalItems) {
            if (
              schema.additionalItems &&
              isObject(schema.additionalItems) &&
              Object.keys(schema.additionalItems).length > 0
            ) {
              hints.push(
                `additional items should be ${formatInnerSchema(
                  schema.additionalItems
                )}`
              );
            }
          }
        } else if (schema.items && Object.keys(schema.items).length > 0) {
          // "additionalItems" is ignored
          items = `${formatInnerSchema(schema.items)}`;
        } else {
          // Fallback for empty `items` value
          items = "any";
        }
      } else {
        // "additionalItems" is ignored
        items = "any";
      }

      if (schema.contains && Object.keys(schema.contains).length > 0) {
        hints.push(
          `should contains at least one ${this.formatSchema(
            schema.contains
          )} item`
        );
      }

      return `[${items}${hasAdditionalItems ? ", ..." : ""}]${
        hints.length > 0 ? ` (${hints.join(", ")})` : ""
      }`;
    }

    if (likeObject(schema)) {
      // not logic already applied in formatValidationError
      newLogic = true;
      const hints = [];

      if (typeof schema.minProperties === "number") {
        hints.push(
          `should not have fewer than ${schema.minProperties} ${
            schema.minProperties > 1 ? "properties" : "property"
          }`
        );
      }

      if (typeof schema.maxProperties === "number") {
        hints.push(
          `should not have more than ${schema.maxProperties} ${
            schema.minProperties && schema.minProperties > 1
              ? "properties"
              : "property"
          }`
        );
      }

      if (
        schema.patternProperties &&
        Object.keys(schema.patternProperties).length > 0
      ) {
        const patternProperties = Object.keys(schema.patternProperties);

        hints.push(
          `additional property names should match pattern${
            patternProperties.length > 1 ? "s" : ""
          } ${patternProperties
            .map((pattern) => JSON.stringify(pattern))
            .join(" | ")}`
        );
      }

      const properties = schema.properties
        ? Object.keys(schema.properties)
        : [];
      /** @type {Array<string>} */
      // @ts-ignore
      const required = schema.required ? schema.required : [];
      const allProperties = [
        ...new Set(
          /** @type {Array<string>} */ ([]).concat(required).concat(properties)
        ),
      ];

      const objectStructure = allProperties
        .map((property) => {
          const isRequired = required.includes(property);

          // Some properties need quotes, maybe we should add check
          // Maybe we should output type of property (`foo: string`), but it is looks very unreadable
          return `${property}${isRequired ? "" : "?"}`;
        })
        .concat(
          typeof schema.additionalProperties === "undefined" ||
            Boolean(schema.additionalProperties)
            ? schema.additionalProperties &&
              isObject(schema.additionalProperties)
              ? [`<key>: ${formatInnerSchema(schema.additionalProperties)}`]
              : ["…"]
            : []
        )
        .join(", ");

      const { dependencies, propertyNames, patternRequired } =
        /** @type {Schema & {patternRequired?: Array<string>;}} */ (schema);

      if (dependencies) {
        Object.keys(dependencies).forEach((dependencyName) => {
          const dependency = dependencies[dependencyName];

          if (Array.isArray(dependency)) {
            hints.push(
              `should have ${
                dependency.length > 1 ? "properties" : "property"
              } ${dependency
                .map((dep) => `'${dep}'`)
                .join(", ")} when property '${dependencyName}' is present`
            );
          } else {
            hints.push(
              `should be valid according to the schema ${formatInnerSchema(
                dependency
              )} when property '${dependencyName}' is present`
            );
          }
        });
      }

      if (propertyNames && Object.keys(propertyNames).length > 0) {
        hints.push(
          `each property name should match format ${JSON.stringify(
            schema.propertyNames.format
          )}`
        );
      }

      if (patternRequired && patternRequired.length > 0) {
        hints.push(
          `should have property matching pattern ${patternRequired.map(
            /**
             * @param {string} item
             * @returns {string}
             */
            (item) => JSON.stringify(item)
          )}`
        );
      }

      return `object {${objectStructure ? ` ${objectStructure} ` : ""}}${
        hints.length > 0 ? ` (${hints.join(", ")})` : ""
      }`;
    }

    if (likeNull(schema)) {
      return `${logic ? "" : "non-"}null`;
    }

    if (Array.isArray(schema.type)) {
      // not logic already applied in formatValidationError
      return `${schema.type.join(" | ")}`;
    }

    // Fallback for unknown keywords
    // not logic already applied in formatValidationError
    /* istanbul ignore next */
    return JSON.stringify(schema, null, 2);
  }

  /**
   * @param {Schema=} schemaPart
   * @param {(boolean | Array<string>)=} additionalPath
   * @param {boolean=} needDot
   * @param {boolean=} logic
   * @returns {string}
   */
  getSchemaPartText(schemaPart, additionalPath, needDot = false, logic = true) {
    if (!schemaPart) {
      return "";
    }

    if (Array.isArray(additionalPath)) {
      for (let i = 0; i < additionalPath.length; i++) {
        /** @type {Schema | undefined} */
        const inner =
          schemaPart[/** @type {keyof Schema} */ (additionalPath[i])];

        if (inner) {
          // eslint-disable-next-line no-param-reassign
          schemaPart = inner;
        } else {
          break;
        }
      }
    }

    while (schemaPart.$ref) {
      // eslint-disable-next-line no-param-reassign
      schemaPart = this.getSchemaPart(schemaPart.$ref);
    }

    let schemaText = `${this.formatSchema(schemaPart, logic)}${
      needDot ? "." : ""
    }`;

    if (schemaPart.description) {
      schemaText += `\n-> ${schemaPart.description}`;
    }

    if (schemaPart.link) {
      schemaText += `\n-> Read more at ${schemaPart.link}`;
    }

    return schemaText;
  }

  /**
   * @param {Schema=} schemaPart
   * @returns {string}
   */
  getSchemaPartDescription(schemaPart) {
    if (!schemaPart) {
      return "";
    }

    while (schemaPart.$ref) {
      // eslint-disable-next-line no-param-reassign
      schemaPart = this.getSchemaPart(schemaPart.$ref);
    }

    let schemaText = "";

    if (schemaPart.description) {
      schemaText += `\n-> ${schemaPart.description}`;
    }

    if (schemaPart.link) {
      schemaText += `\n-> Read more at ${schemaPart.link}`;
    }

    return schemaText;
  }

  /**
   * @param {SchemaUtilErrorObject} error
   * @returns {string}
   */
  formatValidationError(error) {
    const { keyword, instancePath: errorInstancePath } = error;

    const splittedInstancePath = errorInstancePath.split("/");
    /**
     * @type {Array<string>}
     */
    const defaultValue = [];
    const prettyInstancePath = splittedInstancePath
      .reduce((acc, val) => {
        if (val.length > 0) {
          if (isNumeric(val)) {
            acc.push(`[${val}]`);
          } else if (/^\[/.test(val)) {
            acc.push(val);
          } else {
            acc.push(`.${val}`);
          }
        }

        return acc;
      }, defaultValue)
      .join("");
    const instancePath = `${this.baseDataPath}${prettyInstancePath}`;

    // const { keyword, instancePath: errorInstancePath } = error;
    // const instancePath = `${this.baseDataPath}${errorInstancePath.replace(/\//g, '.')}`;

    switch (keyword) {
      case "type": {
        const { parentSchema, params } = error;

        switch (params.type) {
          case "number":
            return `${instancePath} should be a ${this.getSchemaPartText(
              parentSchema,
              false,
              true
            )}`;
          case "integer":
            return `${instancePath} should be an ${this.getSchemaPartText(
              parentSchema,
              false,
              true
            )}`;
          case "string":
            return `${instancePath} should be a ${this.getSchemaPartText(
              parentSchema,
              false,
              true
            )}`;
          case "boolean":
            return `${instancePath} should be a ${this.getSchemaPartText(
              parentSchema,
              false,
              true
            )}`;
          case "array":
            return `${instancePath} should be an array:\n${this.getSchemaPartText(
              parentSchema
            )}`;
          case "object":
            return `${instancePath} should be an object:\n${this.getSchemaPartText(
              parentSchema
            )}`;
          case "null":
            return `${instancePath} should be a ${this.getSchemaPartText(
              parentSchema,
              false,
              true
            )}`;
          default:
            return `${instancePath} should be:\n${this.getSchemaPartText(
              parentSchema
            )}`;
        }
      }
      case "instanceof": {
        const { parentSchema } = error;

        return `${instancePath} should be an instance of ${this.getSchemaPartText(
          parentSchema,
          false,
          true
        )}`;
      }
      case "pattern": {
        const { params, parentSchema } = error;
        const { pattern } = params;

        return `${instancePath} should match pattern ${JSON.stringify(
          pattern
        )}${getSchemaNonTypes(parentSchema)}.${this.getSchemaPartDescription(
          parentSchema
        )}`;
      }
      case "format": {
        const { params, parentSchema } = error;
        const { format } = params;

        return `${instancePath} should match format ${JSON.stringify(
          format
        )}${getSchemaNonTypes(parentSchema)}.${this.getSchemaPartDescription(
          parentSchema
        )}`;
      }
      case "formatMinimum":
      case "formatExclusiveMinimum":
      case "formatMaximum":
      case "formatExclusiveMaximum": {
        const { params, parentSchema } = error;
        const { comparison, limit } = params;

        return `${instancePath} should be ${comparison} ${JSON.stringify(
          limit
        )}${getSchemaNonTypes(parentSchema)}.${this.getSchemaPartDescription(
          parentSchema
        )}`;
      }
      case "minimum":
      case "maximum":
      case "exclusiveMinimum":
      case "exclusiveMaximum": {
        const { parentSchema, params } = error;
        const { comparison, limit } = params;
        const [, ...hints] = getHints(
          /** @type {Schema} */ (parentSchema),
          true
        );

        if (hints.length === 0) {
          hints.push(`should be ${comparison} ${limit}`);
        }

        return `${instancePath} ${hints.join(" ")}${getSchemaNonTypes(
          parentSchema
        )}.${this.getSchemaPartDescription(parentSchema)}`;
      }
      case "multipleOf": {
        const { params, parentSchema } = error;
        const { multipleOf } = params;

        return `${instancePath} should be multiple of ${multipleOf}${getSchemaNonTypes(
          parentSchema
        )}.${this.getSchemaPartDescription(parentSchema)}`;
      }
      case "patternRequired": {
        const { params, parentSchema } = error;
        const { missingPattern } = params;

        return `${instancePath} should have property matching pattern ${JSON.stringify(
          missingPattern
        )}${getSchemaNonTypes(parentSchema)}.${this.getSchemaPartDescription(
          parentSchema
        )}`;
      }
      case "minLength": {
        const { params, parentSchema } = error;
        const { limit } = params;

        if (limit === 1) {
          return `${instancePath} should be a non-empty string${getSchemaNonTypes(
            parentSchema
          )}.${this.getSchemaPartDescription(parentSchema)}`;
        }

        const length = limit - 1;

        return `${instancePath} should be longer than ${length} character${
          length > 1 ? "s" : ""
        }${getSchemaNonTypes(parentSchema)}.${this.getSchemaPartDescription(
          parentSchema
        )}`;
      }
      case "minItems": {
        const { params, parentSchema } = error;
        const { limit } = params;

        if (limit === 1) {
          return `${instancePath} should be a non-empty array${getSchemaNonTypes(
            parentSchema
          )}.${this.getSchemaPartDescription(parentSchema)}`;
        }

        return `${instancePath} should not have fewer than ${limit} items${getSchemaNonTypes(
          parentSchema
        )}.${this.getSchemaPartDescription(parentSchema)}`;
      }
      case "minProperties": {
        const { params, parentSchema } = error;
        const { limit } = params;

        if (limit === 1) {
          return `${instancePath} should be a non-empty object${getSchemaNonTypes(
            parentSchema
          )}.${this.getSchemaPartDescription(parentSchema)}`;
        }

        return `${instancePath} should not have fewer than ${limit} properties${getSchemaNonTypes(
          parentSchema
        )}.${this.getSchemaPartDescription(parentSchema)}`;
      }

      case "maxLength": {
        const { params, parentSchema } = error;
        const { limit } = params;
        const max = limit + 1;

        return `${instancePath} should be shorter than ${max} character${
          max > 1 ? "s" : ""
        }${getSchemaNonTypes(parentSchema)}.${this.getSchemaPartDescription(
          parentSchema
        )}`;
      }
      case "maxItems": {
        const { params, parentSchema } = error;
        const { limit } = params;

        return `${instancePath} should not have more than ${limit} items${getSchemaNonTypes(
          parentSchema
        )}.${this.getSchemaPartDescription(parentSchema)}`;
      }
      case "maxProperties": {
        const { params, parentSchema } = error;
        const { limit } = params;

        return `${instancePath} should not have more than ${limit} properties${getSchemaNonTypes(
          parentSchema
        )}.${this.getSchemaPartDescription(parentSchema)}`;
      }
      case "uniqueItems": {
        const { params, parentSchema } = error;
        const { i } = params;

        return `${instancePath} should not contain the item '${
          /** @type {{ data: Array<any> }} **/
          (error).data[i]
        }' twice${getSchemaNonTypes(
          parentSchema
        )}.${this.getSchemaPartDescription(parentSchema)}`;
      }
      case "additionalItems": {
        const { params, parentSchema } = error;
        const { limit } = params;

        return `${instancePath} should not have more than ${limit} items${getSchemaNonTypes(
          parentSchema
        )}. These items are valid:\n${this.getSchemaPartText(parentSchema)}`;
      }
      case "contains": {
        const { parentSchema } = error;

        return `${instancePath} should contains at least one ${this.getSchemaPartText(
          parentSchema,
          ["contains"]
        )} item${getSchemaNonTypes(parentSchema)}.`;
      }
      case "required": {
        const { parentSchema, params } = error;
        const missingProperty = params.missingProperty.replace(/^\./, "");
        const hasProperty =
          parentSchema &&
          Boolean(
            /** @type {Schema} */
            (parentSchema).properties &&
              /** @type {Schema} */
              (parentSchema).properties[missingProperty]
          );

        return `${instancePath} misses the property '${missingProperty}'${getSchemaNonTypes(
          parentSchema
        )}.${
          hasProperty
            ? ` Should be:\n${this.getSchemaPartText(parentSchema, [
                "properties",
                missingProperty,
              ])}`
            : this.getSchemaPartDescription(parentSchema)
        }`;
      }
      case "additionalProperties": {
        const { params, parentSchema } = error;
        const { additionalProperty } = params;

        return `${instancePath} has an unknown property '${additionalProperty}'${getSchemaNonTypes(
          parentSchema
        )}. These properties are valid:\n${this.getSchemaPartText(
          parentSchema
        )}`;
      }
      case "dependencies": {
        const { params, parentSchema } = error;
        const { property, deps } = params;
        const dependencies = deps
          .split(",")
          .map(
            /**
             * @param {string} dep
             * @returns {string}
             */
            (dep) => `'${dep.trim()}'`
          )
          .join(", ");

        return `${instancePath} should have properties ${dependencies} when property '${property}' is present${getSchemaNonTypes(
          parentSchema
        )}.${this.getSchemaPartDescription(parentSchema)}`;
      }
      case "propertyNames": {
        const { params, parentSchema, schema } = error;
        const { propertyName } = params;

        return `${instancePath} property name '${propertyName}' is invalid${getSchemaNonTypes(
          parentSchema
        )}. Property names should be match format ${JSON.stringify(
          schema.format
        )}.${this.getSchemaPartDescription(parentSchema)}`;
      }
      case "enum": {
        const { parentSchema } = error;

        if (
          parentSchema &&
          /** @type {Schema} */
          (parentSchema).enum &&
          /** @type {Schema} */
          (parentSchema).enum.length === 1
        ) {
          return `${instancePath} should be ${this.getSchemaPartText(
            parentSchema,
            false,
            true
          )}`;
        }

        return `${instancePath} should be one of these:\n${this.getSchemaPartText(
          parentSchema
        )}`;
      }
      case "const": {
        const { parentSchema } = error;

        return `${instancePath} should be equal to constant ${this.getSchemaPartText(
          parentSchema,
          false,
          true
        )}`;
      }
      case "not": {
        const postfix = likeObject(/** @type {Schema} */ (error.parentSchema))
          ? `\n${this.getSchemaPartText(error.parentSchema)}`
          : "";
        const schemaOutput = this.getSchemaPartText(
          error.schema,
          false,
          false,
          false
        );

        if (canApplyNot(error.schema)) {
          return `${instancePath} should be any ${schemaOutput}${postfix}.`;
        }

        const { schema, parentSchema } = error;

        return `${instancePath} should not be ${this.getSchemaPartText(
          schema,
          false,
          true
        )}${
          parentSchema && likeObject(parentSchema)
            ? `\n${this.getSchemaPartText(parentSchema)}`
            : ""
        }`;
      }
      case "oneOf":
      case "anyOf": {
        const { parentSchema, children } = error;

        if (children && children.length > 0) {
          if (error.schema.length === 1) {
            const lastChild = children[children.length - 1];
            const remainingChildren = children.slice(0, children.length - 1);

            return this.formatValidationError(
              Object.assign({}, lastChild, {
                children: remainingChildren,
                parentSchema: Object.assign(
                  {},
                  parentSchema,
                  lastChild.parentSchema
                ),
              })
            );
          }

          let filteredChildren = filterChildren(children);

          if (filteredChildren.length === 1) {
            return this.formatValidationError(filteredChildren[0]);
          }

          filteredChildren = groupChildrenByFirstChild(filteredChildren);

          return `${instancePath} should be one of these:\n${this.getSchemaPartText(
            parentSchema
          )}\nDetails:\n${filteredChildren
            .map(
              /**
               * @param {SchemaUtilErrorObject} nestedError
               * @returns {string}
               */
              (nestedError) =>
                ` * ${indent(this.formatValidationError(nestedError), "   ")}`
            )
            .join("\n")}`;
        }

        return `${instancePath} should be one of these:\n${this.getSchemaPartText(
          parentSchema
        )}`;
      }
      case "if": {
        const { params, parentSchema } = error;
        const { failingKeyword } = params;

        return `${instancePath} should match "${failingKeyword}" schema:\n${this.getSchemaPartText(
          parentSchema,
          [failingKeyword]
        )}`;
      }
      case "absolutePath": {
        const { message, parentSchema } = error;

        return `${instancePath}: ${message}${this.getSchemaPartDescription(
          parentSchema
        )}`;
      }
      /* istanbul ignore next */
      default: {
        const { message, parentSchema } = error;
        const ErrorInJSON = JSON.stringify(error, null, 2);

        // For `custom`, `false schema`, `$ref` keywords
        // Fallback for unknown keywords
        return `${instancePath} ${message} (${ErrorInJSON}).\n${this.getSchemaPartText(
          parentSchema,
          false
        )}`;
      }
    }
  }

  /**
   * @param {Array<SchemaUtilErrorObject>} errors
   * @returns {string}
   */
  formatValidationErrors(errors) {
    return errors
      .map((error) => {
        let formattedError = this.formatValidationError(error);

        if (this.postFormatter) {
          formattedError = this.postFormatter(formattedError, error);
        }

        return ` - ${indent(formattedError, "   ")}`;
      })
      .join("\n");
  }
}

export default ValidationError;