import type {
  FileUploadQuery,
  JWTAuth,
  DirectoryResponse,
  FilesystemOp,
  FSQueuedOp,
} from "@modrinth/utils";
import { ModrinthServerError } from "@modrinth/utils";
import { useServersFetch } from "../servers-fetch.ts";
import { ServerModule } from "./base.ts";

export class FSModule extends ServerModule {
  auth!: JWTAuth;
  ops: FilesystemOp[] = [];
  queuedOps: FSQueuedOp[] = [];
  opsQueuedForModification: string[] = [];

  async fetch(): Promise<void> {
    this.auth = await useServersFetch<JWTAuth>(`servers/${this.serverId}/fs`, {}, "fs");
    this.ops = [];
    this.queuedOps = [];
    this.opsQueuedForModification = [];
  }

  private async retryWithAuth<T>(
    requestFn: () => Promise<T>,
    ignoreFailure: boolean = false,
  ): Promise<T> {
    try {
      return await requestFn();
    } catch (error) {
      if (error instanceof ModrinthServerError && error.statusCode === 401) {
        console.debug("Auth failed, refreshing JWT and retrying");
        await this.fetch(); // Refresh auth
        return await requestFn();
      }

      const available = await this.server.testNodeReachability();
      if (!available && !ignoreFailure) {
        this.server.moduleErrors.general = {
          error: new ModrinthServerError(
            "Unable to reach node. FS operation failed and subsequent ping test failed.",
            500,
            error as Error,
            "fs",
          ),
          timestamp: Date.now(),
        };
      }

      throw error;
    }
  }

  listDirContents(
    path: string,
    page: number,
    pageSize: number,
    ignoreFailure: boolean = false,
  ): Promise<DirectoryResponse> {
    return this.retryWithAuth(async () => {
      const encodedPath = encodeURIComponent(path);
      return await useServersFetch(`/list?path=${encodedPath}&page=${page}&page_size=${pageSize}`, {
        override: this.auth,
        retry: false,
      });
    }, ignoreFailure);
  }

  createFileOrFolder(path: string, type: "file" | "directory"): Promise<void> {
    return this.retryWithAuth(async () => {
      const encodedPath = encodeURIComponent(path);
      await useServersFetch(`/create?path=${encodedPath}&type=${type}`, {
        method: "POST",
        contentType: "application/octet-stream",
        override: this.auth,
      });
    });
  }

  uploadFile(path: string, file: File): FileUploadQuery {
    const encodedPath = encodeURIComponent(path);
    const progressSubject = new EventTarget();
    const abortController = new AbortController();

    const uploadPromise = new Promise((resolve, reject) => {
      const xhr = new XMLHttpRequest();

      xhr.upload.addEventListener("progress", (e) => {
        if (e.lengthComputable) {
          const progress = (e.loaded / e.total) * 100;
          progressSubject.dispatchEvent(
            new CustomEvent("progress", {
              detail: { loaded: e.loaded, total: e.total, progress },
            }),
          );
        }
      });

      xhr.onload = () => {
        if (xhr.status >= 200 && xhr.status < 300) {
          resolve(xhr.response);
        } else {
          reject(new Error(`Upload failed with status ${xhr.status}`));
        }
      };

      xhr.onerror = () => reject(new Error("Upload failed"));
      xhr.onabort = () => reject(new Error("Upload cancelled"));

      xhr.open("POST", `https://${this.auth.url}/create?path=${encodedPath}&type=file`);
      xhr.setRequestHeader("Authorization", `Bearer ${this.auth.token}`);
      xhr.setRequestHeader("Content-Type", "application/octet-stream");
      xhr.send(file);

      abortController.signal.addEventListener("abort", () => xhr.abort());
    });

    return {
      promise: uploadPromise,
      onProgress: (
        callback: (progress: { loaded: number; total: number; progress: number }) => void,
      ) => {
        progressSubject.addEventListener("progress", ((e: CustomEvent) => {
          callback(e.detail);
        }) as EventListener);
      },
      cancel: () => abortController.abort(),
    } as FileUploadQuery;
  }

  renameFileOrFolder(path: string, name: string): Promise<void> {
    const pathName = path.split("/").slice(0, -1).join("/") + "/" + name;
    return this.retryWithAuth(async () => {
      await useServersFetch(`/move`, {
        method: "POST",
        override: this.auth,
        body: { source: path, destination: pathName },
      });
    });
  }

  updateFile(path: string, content: string): Promise<void> {
    const octetStream = new Blob([content], { type: "application/octet-stream" });
    return this.retryWithAuth(async () => {
      await useServersFetch(`/update?path=${path}`, {
        method: "PUT",
        contentType: "application/octet-stream",
        body: octetStream,
        override: this.auth,
      });
    });
  }

  moveFileOrFolder(path: string, newPath: string): Promise<void> {
    return this.retryWithAuth(async () => {
      await this.server.createMissingFolders(newPath.substring(0, newPath.lastIndexOf("/")));
      await useServersFetch(`/move`, {
        method: "POST",
        override: this.auth,
        body: { source: path, destination: newPath },
      });
    });
  }

  deleteFileOrFolder(path: string, recursive: boolean): Promise<void> {
    const encodedPath = encodeURIComponent(path);
    return this.retryWithAuth(async () => {
      await useServersFetch(`/delete?path=${encodedPath}&recursive=${recursive}`, {
        method: "DELETE",
        override: this.auth,
      });
    });
  }

  downloadFile(path: string, raw: boolean = false, ignoreFailure: boolean = false): Promise<any> {
    return this.retryWithAuth(async () => {
      const encodedPath = encodeURIComponent(path);
      const fileData = await useServersFetch(`/download?path=${encodedPath}`, {
        override: this.auth,
      });

      if (fileData instanceof Blob) {
        return raw ? fileData : await fileData.text();
      }
      return fileData;
    }, ignoreFailure);
  }

  extractFile(
    path: string,
    override = true,
    dry = false,
    silentQueue = false,
  ): Promise<{ modpack_name: string | null; conflicting_files: string[] }> {
    return this.retryWithAuth(async () => {
      const encodedPath = encodeURIComponent(path);

      if (!silentQueue) {
        this.queuedOps.push({ op: "unarchive", src: path });
        setTimeout(() => this.removeQueuedOp("unarchive", path), 4000);
      }

      try {
        return await useServersFetch(
          `/unarchive?src=${encodedPath}&trg=/&override=${override}&dry=${dry}`,
          {
            method: "POST",
            override: this.auth,
            version: 1,
          },
          undefined,
          "Error extracting file",
        );
      } catch (err) {
        this.removeQueuedOp("unarchive", path);
        throw err;
      }
    });
  }

  modifyOp(id: string, action: "dismiss" | "cancel"): Promise<void> {
    return this.retryWithAuth(async () => {
      await useServersFetch(
        `/ops/${action}?id=${id}`,
        {
          method: "POST",
          override: this.auth,
          version: 1,
        },
        undefined,
        `Error ${action === "dismiss" ? "dismissing" : "cancelling"} filesystem operation`,
      );

      this.opsQueuedForModification = this.opsQueuedForModification.filter((x: string) => x !== id);
      this.ops = this.ops.filter((x: FilesystemOp) => x.id !== id);
    });
  }

  removeQueuedOp(op: FSQueuedOp["op"], src: string): void {
    this.queuedOps = this.queuedOps.filter((x: FSQueuedOp) => x.op !== op || x.src !== src);
  }

  clearQueuedOps(): void {
    this.queuedOps = [];
  }
}