import {
  Controller,
  Delete,
  FormField,
  Get,
  Patch,
  Path,
  Post,
  Request,
  Route,
  Security,
  SuccessResponse,
  Tags,
  UploadedFile,
} from "tsoa";
import esClient from "../elasticsearch";
import minioClient from "../storage";
import HttpStatusCode from "../interfaces/http-status";
import { pathExist } from "../utils/minio";
import HttpError from "../interfaces/http-error";
import { EhrFile } from "../interfaces/ehr-fs";

@Route("/cabinet/{cabinetName}/drawer/{drawerName}/folder/{folderName}/file")
export class FileController extends Controller {
  @Post("/")
  @Tags("File")
  @Security("bearerAuth")
  @SuccessResponse(HttpStatusCode.CREATED)
  public async uploadFile(
    @Request() request: { user: { preferred_username: string } },
    @UploadedFile() file: Express.Multer.File,
    @FormField() title: string,
    @FormField() description: string,
    @FormField() keyword: string,
    @FormField() category: string,
    @Path() cabinetName: string,
    @Path() drawerName: string,
    @Path() folderName: string,
  ) {
    const filename = Buffer.from(file.originalname, "latin1").toString("utf-8");
    const pathname = `${cabinetName}/${drawerName}/${folderName}/${filename}`;

    if (!(await pathExist(`${cabinetName}/${drawerName}/${folderName}/`))) {
      throw new HttpError(
        HttpStatusCode.PRECONDITION_FAILED,
        "Cabinet, drawer or folder cannot be found.",
      );
    }

    const info = await minioClient
      .putObject("ehr", pathname, file.buffer, file.size, {
        "Content-Type": file.mimetype,
        createdAt: new Date().toISOString(),
        createdBy: request.user.preferred_username,
      })
      .catch((e) => console.error(e));

    if (!info) throw new Error("Object storage error occured.");

    const search = await esClient.search<EhrFile & { attachment: Record<string, string> }>({
      index: process.env.ELASTICSEARCH_INDEX ?? 'ehr-index',
      query: {
        match: {
          pathname: pathname,
        },
      },
    });

    const exist = search.hits.hits.find((v) => v._source?.pathname === pathname);

    const metadata: Partial<EhrFile> = {
      pathname,
      fileName: filename,
      fileSize: file.size,
      fileType: file.mimetype,
      title: title,
      description: description,
      category: category.split(","),
      keyword: keyword.split(","),
    };

    if (!exist) {
      await esClient.index({
        pipeline: "attachment",
        index: process.env.ELASTICSEARCH_INDEX ?? 'ehr-index',
        document: {
          data: Buffer.from(file.buffer).toString("base64"),
          createdAt: new Date().toISOString(),
          createdBy: request.user.preferred_username,
          updatedAt: new Date().toISOString(),
          updatedBy: request.user.preferred_username,
          ...metadata,
        },
      });
    } else {
      await esClient.delete({ index: exist._index, id: exist._id });
      await esClient.index({
        pipeline: "attachment",
        index: process.env.ELASTICSEARCH_INDEX ?? 'ehr-index',
        document: {
          data: Buffer.from(file.buffer).toString("base64"),
          createdAt: exist._source?.createdAt,
          createdBy: exist._source?.createdBy,
          updatedAt: new Date().toISOString(),
          updatedBy: request.user.preferred_username,
          ...metadata,
        },
      });
    }

    return this.setStatus(HttpStatusCode.CREATED);
  }

  @Get("/")
  @Tags("File")
  @SuccessResponse(HttpStatusCode.OK)
  public async getFile(
    @Path() cabinetName: string,
    @Path() drawerName: string,
    @Path() folderName: string,
  ): Promise<EhrFile[]> {
    const search = await esClient.search<
      EhrFile & {
        attachment: Record<string, string>;
      }
    >({
      index: process.env.ELASTICSEARCH_INDEX ?? 'ehr-index',
      query: {
        prefix: {
          pathname: `${cabinetName}/${drawerName}/${folderName}/`,
        },
      },
    });

    // Use flatMap for return type only. Filter does not change type after filter out undefined or null
    const records = search.hits.hits
      .map((v) => {
        if (!v._source) return;

        const { attachment, ...rest } = v._source;

        return rest;
      })
      .flatMap((v) => (v ? [v] : []));

    return records;
  }

  @Patch("/{fileName}")
  @Tags("File")
  @Security("bearerAuth")
  @SuccessResponse(HttpStatusCode.OK)
  public async updateFile(
    @Request() request: { user: { preferred_username: string } },
    @Path() cabinetName: string,
    @Path() drawerName: string,
    @Path() folderName: string,
    @Path() fileName: string,
    @UploadedFile() file?: Express.Multer.File,
    @FormField() title?: string,
    @FormField() description?: string,
    @FormField() keyword?: string,
    @FormField() category?: string,
  ) {
    const search = await esClient.search<EhrFile & { attachment: Record<string, string> }>({
      index: process.env.ELASTICSEARCH_INDEX ?? 'ehr-index',
      query: {
        match: {
          pathname: `${cabinetName}/${drawerName}/${folderName}/${fileName}`,
        },
      },
    });

    if (search && search.hits.hits.length === 0) {
      throw new HttpError(HttpStatusCode.NOT_FOUND, "Not found");
    }

    const data = search.hits.hits[0];

    if (!file) {
      const esResult = await esClient
        .update({
          index: process.env.ELASTICSEARCH_INDEX ?? 'ehr-index',
          id: data._id,
          doc: {
            title,
            description,
            keyword: keyword?.split(","),
            category: category?.split(","),
            updatedAt: new Date().toISOString(),
            updatedBy: request.user.preferred_username,
          },
        })
        .catch((e) => console.error(e));

      if (!esResult) throw new Error("An error occured, cannot perform this action.");
    } else {
      const filename = Buffer.from(file.originalname, "latin1").toString("utf-8");
      const pathname = `${cabinetName}/${drawerName}/${folderName}/${filename}`;

      await minioClient.removeObject(
        "ehr",
        `${cabinetName}/${drawerName}/${folderName}/${fileName}`,
      );

      const info = await minioClient
        .putObject("ehr", pathname, file.buffer, file.size, {
          "Content-Type": file.mimetype,
          createdAt: new Date().toISOString(),
          createdBy: request.user.preferred_username,
        })
        .catch((e) => console.error(e));

      if (!info) throw new Error("Object storage error occured.");

      await esClient.delete({ index: data._index, id: data._id });
      await esClient.index({
        pipeline: "attachment",
        index: process.env.ELASTICSEARCH_INDEX ?? 'ehr-index',
        document: {
          data: Buffer.from(file.buffer).toString("base64"),
          pathname,
          fileName: filename,
          fileSize: file.size,
          fileType: file.mimetype,
          title: title,
          description: description,
          category: category?.split(","),
          keyword: keyword?.split(","),
          createdAt: data._source?.createdAt,
          createdBy: data._source?.createdBy,
          updatedAt: new Date().toISOString(),
          updatedBy: request.user.preferred_username,
        },
      });
    }

    return this.setStatus(HttpStatusCode.NO_CONTENT);
  }

  @Delete("/{fileName}")
  @Tags("File")
  @Security("bearerAuth")
  @SuccessResponse(HttpStatusCode.OK)
  public async deleteFile(
    @Path() cabinetName: string,
    @Path() drawerName: string,
    @Path() folderName: string,
    @Path() fileName: string,
  ) {
    const search = await esClient.search<
      EhrFile & {
        attachment: Record<string, string>;
      }
    >({
      index: process.env.ELASTICSEARCH_INDEX ?? 'ehr-index',
      query: {
        match: {
          pathname: `${cabinetName}/${drawerName}/${folderName}/${fileName}`,
        },
      },
    });

    if (search && search.hits.hits.length === 0) {
      throw new HttpError(HttpStatusCode.NOT_FOUND, "Not found");
    }

    const esResult = await esClient
      .delete({
        index: process.env.ELASTICSEARCH_INDEX ?? 'ehr-index',
        id: search.hits.hits[0]._id,
      })
      .catch((e) => console.error(e));

    if (!esResult) throw new Error("An error occured, cannot perform this action.");

    await minioClient.removeObject("ehr", `${cabinetName}/${drawerName}/${folderName}/${fileName}`);

    return this.setStatus(HttpStatusCode.NO_CONTENT);
  }

  @Get("/{fileName}")
  @Tags("File")
  @SuccessResponse(HttpStatusCode.OK)
  public async downloadFile(
    @Path() cabinetName: string,
    @Path() drawerName: string,
    @Path() folderName: string,
    @Path() fileName: string,
  ) {
    const search = await esClient.search<EhrFile & { attachment: Record<string, string> }>({
      index: process.env.ELASTICSEARCH_INDEX ?? 'ehr-index',
      query: {
        match: {
          pathname: `${cabinetName}/${drawerName}/${folderName}/${fileName}`,
        },
      },
    });

    if (search && search.hits.hits.length === 0) {
      throw new HttpError(HttpStatusCode.NOT_FOUND, "Not found");
    }

    const data = search.hits.hits[0]._source;

    if (!data) {
      throw new HttpError(HttpStatusCode.INTERNAL_SERVER_ERROR, "Found data but no info.");
    }

    const { attachment, ...rest } = data;

    return {
      ...rest,
      download: await minioClient.presignedGetObject(
        "ehr",
        `${cabinetName}/${drawerName}/${folderName}/${fileName}`,
      ),
    };
  }
}