import { AutoBeOpenApi } from "@autobe/interface";
import { IHttpMigrateApplication, OpenApi } from "@typia/interface";
import { HttpMigration, OpenApiTypeChecker } from "@typia/utils";

export function invertOpenApiDocument(
  document: OpenApi.IDocument,
): AutoBeOpenApi.IDocument {
  const app: IHttpMigrateApplication = HttpMigration.application(document);
  return {
    operations: app.routes
      .filter((r) => r.query === null)
      .map(
        (r) =>
          ({
            authorizationType: null,
            method: r.method as "post",
            path: r.path,
            description:
              writeDescription(r.operation()) ?? empty("description"),
            specification: r.operation()
              ? // biome-ignore lint: intended
                ((r.operation() as any)["x-autobe-specification"] ??
                empty("x-autobe-specification"))
              : empty("x-autobe-specification"),
            accessor: r.accessor,
            parameters: r.parameters.map(
              (p) =>
                ({
                  name: p.name,
                  description:
                    p.parameter().description ?? empty("description"),
                  // biome-ignore lint: intended
                  schema: p.schema as any,
                }) satisfies AutoBeOpenApi.IParameter,
            ),
            requestBody:
              r.body?.type === "application/json" &&
              OpenApiTypeChecker.isReference(r.body.schema)
                ? {
                    description: r.body.description() ?? empty("description"),
                    typeName: r.body.schema.$ref.split("/").pop()!,
                  }
                : null,
            responseBody:
              r.success?.type === "application/json" &&
              OpenApiTypeChecker.isReference(r.success.schema)
                ? {
                    description:
                      r.success.description() ?? empty("description"),
                    typeName: r.success.schema.$ref.split("/").pop()!,
                  }
                : null,
            authorizationActor: null,
            name: r.accessor.at(-1)!,
            prerequisites: [],
          }) satisfies AutoBeOpenApi.IOperation,
      ),
    components: {
      schemas: (document.components?.schemas ?? {}) as Record<
        string,
        AutoBeOpenApi.IJsonSchemaDescriptive
      >,
      authorizations: [],
    },
  };
}

function writeDescription(operation: OpenApi.IOperation): string | undefined {
  if (operation.summary === undefined && operation.description === undefined)
    return undefined;
  if (operation.summary === undefined) return operation.description;
  else if (operation.description === undefined) return operation.summary;
  else if (operation.description.startsWith(operation.summary))
    return operation.description;
  return `${operation.summary}${operation.summary.endsWith(".") ? "" : "."}\n\n${operation.description}`;
}

function empty(key: string): string {
  return `Describe ${key} as much as possible with clear and concise words.`;
}