import { ClassProperties } from "../../typings/ClassProperties";

import { IMetadataAtomic } from "./IMetadataAtomic";
import { IMetadataTypeTag } from "./IMetadataTypeTag";

export class MetadataAtomic {
  public readonly type: "boolean" | "bigint" | "number" | "string";
  public readonly tags: IMetadataTypeTag[][];

  private name_?: string;

  /**
   * @internal
   */
  private constructor(props: ClassProperties<MetadataAtomic>) {
    this.type = props.type;
    this.tags = props.tags;
  }

  public static create(props: ClassProperties<MetadataAtomic>): MetadataAtomic {
    return new MetadataAtomic(props);
  }

  public static from(json: IMetadataAtomic): MetadataAtomic {
    return MetadataAtomic.create({
      type: json.type,
      tags: json.tags.map((row) =>
        row.map((tag) => ({
          target: tag.target,
          name: tag.name,
          kind: tag.kind,
          value:
            typeof tag.value === "object" &&
            tag.value?.type === "bigint" &&
            typeof tag.value.value === "string"
              ? BigInt(tag.value.value)
              : tag.value,
          validate: tag.validate,
          exclusive: tag.exclusive,
          schema: tag.schema,
        })),
      ),
    });
  }

  public getName(): string {
    return (this.name_ ??= getName(this));
  }

  public toJSON(): IMetadataAtomic {
    return {
      type: this.type,
      tags: this.tags.map((row) =>
        row.map((tag) => ({
          target: tag.target,
          name: tag.name,
          kind: tag.kind,
          value:
            typeof tag.value === "bigint"
              ? {
                  type: "bigint",
                  value: tag.value.toString(),
                }
              : tag.value,
          validate: tag.validate,
          exclusive: tag.exclusive,
          schema: tag.schema,
        })),
      ),
    };
  }
}

const getName = (obj: MetadataAtomic): string => {
  if (obj.tags.length === 0) return obj.type;
  else if (obj.tags.length === 1) {
    const str: string = [obj.type, ...obj.tags[0]!.map((t) => t.name)].join(
      " & ",
    );
    return `(${str})`;
  }
  const rows: string[] = obj.tags.map((row) => {
    const str: string = row.map((t) => t.name).join(" & ");
    return row.length === 1 ? str : `(${str})`;
  });
  return `(${obj.type} & (${rows.join(" | ")}))`;
};