import React, {
  useEffect,
  useState,
  useRef,
  forwardRef,
  useImperativeHandle,
} from "react";
import {
  Folder,
  File,
  ArrowUp,
  Pin,
  MoreVertical,
  Trash2,
  Edit3,
} from "lucide-react";
import { ScrollArea } from "@/components/ui/scroll-area.tsx";
import { cn } from "@/lib/utils.ts";
import { Input } from "@/components/ui/input.tsx";
import { Button } from "@/components/ui/button.tsx";
import { toast } from "sonner";
import { useTranslation } from "react-i18next";
import {
  listSSHFiles,
  renameSSHItem,
  deleteSSHItem,
  getFileManagerPinned,
  addFileManagerPinned,
  removeFileManagerPinned,
  getSSHStatus,
  connectSSH,
} from "@/ui/main-axios.ts";
import type { SSHHost } from "../../../types/index.js";

const FileManagerLeftSidebar = forwardRef(function FileManagerSidebar(
  {
    onOpenFile,
    tabs,
    host,
    onOperationComplete,
    onPathChange,
    onDeleteItem,
  }: {
    onSelectView?: (view: string) => void;
    onOpenFile: (file: any) => void;
    tabs: any[];
    host: SSHHost;
    onOperationComplete?: () => void;
    onError?: (error: string) => void;
    onSuccess?: (message: string) => void;
    onPathChange?: (path: string) => void;
    onDeleteItem?: (item: any) => void;
  },
  ref,
) {
  const { t } = useTranslation();
  const [currentPath, setCurrentPath] = useState("/");
  const [files, setFiles] = useState<any[]>([]);
  const pathInputRef = useRef<HTMLInputElement>(null);

  const [search, setSearch] = useState("");
  const [debouncedSearch, setDebouncedSearch] = useState("");
  const [fileSearch, setFileSearch] = useState("");
  const [debouncedFileSearch, setDebouncedFileSearch] = useState("");
  useEffect(() => {
    const handler = setTimeout(() => setDebouncedSearch(search), 200);
    return () => clearTimeout(handler);
  }, [search]);
  useEffect(() => {
    const handler = setTimeout(() => setDebouncedSearch(fileSearch), 200);
    return () => clearTimeout(handler);
  }, [fileSearch]);

  const [sshSessionId, setSshSessionId] = useState<string | null>(null);
  const [filesLoading, setFilesLoading] = useState(false);
  const [connectingSSH, setConnectingSSH] = useState(false);
  const [connectionCache, setConnectionCache] = useState<
    Record<
      string,
      {
        sessionId: string;
        timestamp: number;
      }
    >
  >({});
  const [fetchingFiles, setFetchingFiles] = useState(false);

  const [contextMenu, setContextMenu] = useState<{
    visible: boolean;
    x: number;
    y: number;
    item: any;
  }>({
    visible: false,
    x: 0,
    y: 0,
    item: null,
  });

  const [renamingItem, setRenamingItem] = useState<{
    item: any;
    newName: string;
  } | null>(null);

  useEffect(() => {
    const nextPath = host?.defaultPath || "/";
    setCurrentPath(nextPath);
    onPathChange?.(nextPath);
    (async () => {
      await connectToSSH(host);
    })();
  }, [host?.id]);

  async function connectToSSH(server: SSHHost): Promise<string | null> {
    const sessionId = server.id.toString();

    const cached = connectionCache[sessionId];
    if (cached && Date.now() - cached.timestamp < 30000) {
      setSshSessionId(cached.sessionId);
      return cached.sessionId;
    }

    if (connectingSSH) {
      return null;
    }

    setConnectingSSH(true);

    try {
      if (!server.password && !server.key) {
        toast.error(t("common.noAuthCredentials"));
        return null;
      }

      const connectionConfig = {
        hostId: server.id,
        ip: server.ip,
        port: server.port,
        username: server.username,
        password: server.password,
        sshKey: server.key,
        keyPassword: server.keyPassword,
        authType: server.authType,
        credentialId: server.credentialId,
        userId: server.userId,
      };

      await connectSSH(sessionId, connectionConfig);

      setSshSessionId(sessionId);

      setConnectionCache((prev) => ({
        ...prev,
        [sessionId]: { sessionId, timestamp: Date.now() },
      }));

      return sessionId;
    } catch (err: any) {
      toast.error(
        err?.response?.data?.error || t("fileManager.failedToConnectSSH"),
      );
      setSshSessionId(null);
      return null;
    } finally {
      setConnectingSSH(false);
    }
  }

  async function fetchFiles() {
    if (fetchingFiles) {
      return;
    }

    setFetchingFiles(true);
    setFiles([]);
    setFilesLoading(true);

    try {
      let pinnedFiles: any[] = [];
      try {
        if (host) {
          pinnedFiles = await getFileManagerPinned(host.id);
        }
      } catch (err) {}

      if (host && sshSessionId) {
        let res: any[] = [];

        try {
          const status = await getSSHStatus(sshSessionId);
          if (!status.connected) {
            const newSessionId = await connectToSSH(host);
            if (newSessionId) {
              setSshSessionId(newSessionId);
              res = await listSSHFiles(newSessionId, currentPath);
            } else {
              throw new Error(t("fileManager.failedToReconnectSSH"));
            }
          } else {
            res = await listSSHFiles(sshSessionId, currentPath);
          }
        } catch (sessionErr) {
          const newSessionId = await connectToSSH(host);
          if (newSessionId) {
            setSshSessionId(newSessionId);
            res = await listSSHFiles(newSessionId, currentPath);
          } else {
            throw sessionErr;
          }
        }

        const processedFiles = (res || []).map((f: any) => {
          const filePath =
            currentPath + (currentPath.endsWith("/") ? "" : "/") + f.name;
          const isPinned = pinnedFiles.some(
            (pinned) => pinned.path === filePath,
          );
          return {
            ...f,
            path: filePath,
            isPinned,
            isSSH: true,
            sshSessionId: sshSessionId,
          };
        });

        setFiles(processedFiles);
      }
    } catch (err: any) {
      setFiles([]);
      toast.error(
        err?.response?.data?.error ||
          err?.message ||
          t("fileManager.failedToListFiles"),
      );
    } finally {
      setFilesLoading(false);
      setFetchingFiles(false);
    }
  }

  useEffect(() => {
    if (host && sshSessionId && !connectingSSH && !fetchingFiles) {
      const timeoutId = setTimeout(() => {
        fetchFiles();
      }, 100);
      return () => clearTimeout(timeoutId);
    }
  }, [currentPath, host, sshSessionId]);

  useImperativeHandle(ref, () => ({
    openFolder: async (_server: SSHHost, path: string) => {
      if (connectingSSH || fetchingFiles) {
        return;
      }

      if (currentPath === path) {
        setTimeout(() => fetchFiles(), 100);
        return;
      }

      setFetchingFiles(false);
      setFilesLoading(false);
      setFiles([]);

      setCurrentPath(path);
      onPathChange?.(path);
      if (!sshSessionId) {
        const sessionId = await connectToSSH(host);
        if (sessionId) setSshSessionId(sessionId);
      }
    },
    fetchFiles: () => {
      if (host && sshSessionId) {
        fetchFiles();
      }
    },
    getCurrentPath: () => currentPath,
  }));

  useEffect(() => {
    if (pathInputRef.current) {
      pathInputRef.current.scrollLeft = pathInputRef.current.scrollWidth;
    }
  }, [currentPath]);

  const filteredFiles = files.filter((file) => {
    const q = debouncedFileSearch.trim().toLowerCase();
    if (!q) return true;
    return file.name.toLowerCase().includes(q);
  });

  const handleContextMenu = (e: React.MouseEvent, item: any) => {
    e.preventDefault();

    const viewportWidth = window.innerWidth;
    const viewportHeight = window.innerHeight;

    const menuWidth = 160;
    const menuHeight = 80;

    let x = e.clientX;
    let y = e.clientY;

    if (x + menuWidth > viewportWidth) {
      x = e.clientX - menuWidth;
    }

    if (y + menuHeight > viewportHeight) {
      y = e.clientY - menuHeight;
    }

    if (x < 0) {
      x = 0;
    }

    if (y < 0) {
      y = 0;
    }

    setContextMenu({
      visible: true,
      x,
      y,
      item,
    });
  };

  const closeContextMenu = () => {
    setContextMenu({ visible: false, x: 0, y: 0, item: null });
  };

  const handleRename = async (item: any, newName: string) => {
    if (!sshSessionId || !newName.trim() || newName === item.name) {
      setRenamingItem(null);
      return;
    }

    try {
      await renameSSHItem(sshSessionId, item.path, newName.trim());
      toast.success(
        `${item.type === "directory" ? t("common.folder") : t("common.file")} ${t("common.renamedSuccessfully")}`,
      );
      setRenamingItem(null);
      if (onOperationComplete) {
        onOperationComplete();
      } else {
        fetchFiles();
      }
    } catch (error: any) {
      toast.error(
        error?.response?.data?.error || t("fileManager.failedToRenameItem"),
      );
    }
  };

  const startRename = (item: any) => {
    setRenamingItem({ item, newName: item.name });
    closeContextMenu();
  };

  const startDelete = (item: any) => {
    onDeleteItem?.(item);
    closeContextMenu();
  };

  useEffect(() => {
    const handleClickOutside = () => closeContextMenu();
    document.addEventListener("click", handleClickOutside);
    return () => document.removeEventListener("click", handleClickOutside);
  }, []);

  const handlePathChange = (newPath: string) => {
    setCurrentPath(newPath);
    onPathChange?.(newPath);
  };

  return (
    <div className="flex flex-col h-full w-[256px] max-w-[256px]">
      <div className="flex flex-col flex-grow min-h-0">
        <div className="flex-1 w-full h-full flex flex-col bg-dark-bg-darkest border-r-2 border-dark-border overflow-hidden p-0 relative min-h-0">
          {host && (
            <div className="flex flex-col h-full w-full max-w-[260px]">
              <div className="flex items-center gap-2 px-2 py-1.5 border-b-2 border-dark-border bg-dark-bg z-20 max-w-[260px]">
                <Button
                  size="icon"
                  variant="outline"
                  className="h-9 w-9 bg-dark-bg border-2 border-dark-border rounded-md hover:bg-dark-hover focus:outline-none focus:ring-2 focus:ring-ring"
                  onClick={() => {
                    let path = currentPath;
                    if (path && path !== "/" && path !== "") {
                      if (path.endsWith("/")) path = path.slice(0, -1);
                      const lastSlash = path.lastIndexOf("/");
                      if (lastSlash > 0) {
                        handlePathChange(path.slice(0, lastSlash));
                      } else {
                        handlePathChange("/");
                      }
                    } else {
                      handlePathChange("/");
                    }
                  }}
                >
                  <ArrowUp className="w-4 h-4" />
                </Button>
                <Input
                  ref={pathInputRef}
                  value={currentPath}
                  onChange={(e) => handlePathChange(e.target.value)}
                  className="flex-1 bg-dark-bg border-2 border-dark-border-hover text-white truncate rounded-md px-2 py-1 focus:outline-none focus:ring-2 focus:ring-ring hover:border-dark-border-light"
                />
              </div>
              <div className="px-2 py-2 border-b-1 border-dark-border bg-dark-bg">
                <Input
                  placeholder={t("fileManager.searchFilesAndFolders")}
                  className="w-full h-7 text-sm bg-dark-bg-button border-2 border-dark-border-hover text-white placeholder:text-muted-foreground rounded-md"
                  autoComplete="off"
                  value={fileSearch}
                  onChange={(e) => setFileSearch(e.target.value)}
                />
              </div>
              <div className="flex-1 min-h-0 w-full bg-dark-bg-darkest border-t-1 border-dark-border">
                <ScrollArea className="h-full w-full bg-dark-bg-darkest">
                  <div className="p-2 pb-0">
                    {connectingSSH || filesLoading ? (
                      <div className="text-xs text-muted-foreground">
                        {t("common.loading")}
                      </div>
                    ) : filteredFiles.length === 0 ? (
                      <div className="text-xs text-muted-foreground">
                        {t("fileManager.noFilesOrFoldersFound")}
                      </div>
                    ) : (
                      <div className="flex flex-col gap-1">
                        {filteredFiles.map((item: any) => {
                          const isOpen = (tabs || []).some(
                            (t: any) => t.id === item.path,
                          );
                          const isRenaming =
                            renamingItem?.item?.path === item.path;
                          const isDeleting = false;

                          return (
                            <div
                              key={item.path}
                              className={cn(
                                "flex items-center gap-2 px-3 py-2 bg-dark-bg border-2 border-dark-border rounded group max-w-[220px] mb-2 relative",
                                isOpen &&
                                  "opacity-60 cursor-not-allowed pointer-events-none",
                              )}
                              onContextMenu={(e) =>
                                !isOpen && handleContextMenu(e, item)
                              }
                            >
                              {isRenaming ? (
                                <div className="flex items-center gap-2 flex-1 min-w-0">
                                  {item.type === "directory" ? (
                                    <Folder className="w-4 h-4 text-blue-400 flex-shrink-0" />
                                  ) : (
                                    <File className="w-4 h-4 text-muted-foreground flex-shrink-0" />
                                  )}
                                  <Input
                                    value={renamingItem.newName}
                                    onChange={(e) =>
                                      setRenamingItem((prev) =>
                                        prev
                                          ? {
                                              ...prev,
                                              newName: e.target.value,
                                            }
                                          : null,
                                      )
                                    }
                                    className="flex-1 h-6 text-sm bg-dark-bg-button border border-dark-border-hover text-white"
                                    autoFocus
                                    onKeyDown={(e) => {
                                      if (e.key === "Enter") {
                                        handleRename(
                                          item,
                                          renamingItem.newName,
                                        );
                                      } else if (e.key === "Escape") {
                                        setRenamingItem(null);
                                      }
                                    }}
                                    onBlur={() =>
                                      handleRename(item, renamingItem.newName)
                                    }
                                  />
                                </div>
                              ) : (
                                <>
                                  <div
                                    className="flex items-center gap-2 flex-1 cursor-pointer min-w-0"
                                    onClick={() =>
                                      !isOpen &&
                                      (item.type === "directory"
                                        ? handlePathChange(item.path)
                                        : onOpenFile({
                                            name: item.name,
                                            path: item.path,
                                            isSSH: item.isSSH,
                                            sshSessionId: item.sshSessionId,
                                          }))
                                    }
                                  >
                                    {item.type === "directory" ? (
                                      <Folder className="w-4 h-4 text-blue-400 flex-shrink-0" />
                                    ) : (
                                      <File className="w-4 h-4 text-muted-foreground flex-shrink-0" />
                                    )}
                                    <span className="text-sm text-white truncate flex-1 min-w-0">
                                      {item.name}
                                    </span>
                                  </div>
                                  <div className="flex items-center gap-1">
                                    {item.type === "file" && (
                                      <Button
                                        size="icon"
                                        variant="ghost"
                                        className="h-7 w-7"
                                        disabled={isOpen}
                                        onClick={async (e) => {
                                          e.stopPropagation();
                                          try {
                                            if (item.isPinned) {
                                              await removeFileManagerPinned({
                                                name: item.name,
                                                path: item.path,
                                                hostId: host?.id,
                                                isSSH: true,
                                                sshSessionId:
                                                  host?.id.toString(),
                                              });
                                              setFiles(
                                                files.map((f) =>
                                                  f.path === item.path
                                                    ? {
                                                        ...f,
                                                        isPinned: false,
                                                      }
                                                    : f,
                                                ),
                                              );
                                            } else {
                                              await addFileManagerPinned({
                                                name: item.name,
                                                path: item.path,
                                                hostId: host?.id,
                                                isSSH: true,
                                                sshSessionId:
                                                  host?.id.toString(),
                                              });
                                              setFiles(
                                                files.map((f) =>
                                                  f.path === item.path
                                                    ? {
                                                        ...f,
                                                        isPinned: true,
                                                      }
                                                    : f,
                                                ),
                                              );
                                            }
                                          } catch (err) {}
                                        }}
                                      >
                                        <Pin
                                          className={`w-1 h-1 ${item.isPinned ? "text-yellow-400 fill-current" : "text-muted-foreground"}`}
                                        />
                                      </Button>
                                    )}
                                    {!isOpen && (
                                      <Button
                                        size="icon"
                                        variant="ghost"
                                        className="h-7 w-7 opacity-0 group-hover:opacity-100 transition-opacity"
                                        onClick={(e) => {
                                          e.stopPropagation();
                                          handleContextMenu(e, item);
                                        }}
                                      >
                                        <MoreVertical className="w-4 h-4" />
                                      </Button>
                                    )}
                                  </div>
                                </>
                              )}
                            </div>
                          );
                        })}
                      </div>
                    )}
                  </div>
                </ScrollArea>
              </div>
            </div>
          )}
        </div>
      </div>

      {contextMenu.visible && contextMenu.item && (
        <div
          className="fixed z-[99998] bg-dark-bg border-2 border-dark-border rounded-lg shadow-xl py-1 min-w-[160px]"
          style={{
            left: contextMenu.x,
            top: contextMenu.y,
          }}
        >
          <button
            className="w-full px-3 py-2 text-left text-sm text-white hover:bg-dark-hover flex items-center gap-2"
            onClick={() => startRename(contextMenu.item)}
          >
            <Edit3 className="w-4 h-4" />
            Rename
          </button>
          <button
            className="w-full px-3 py-2 text-left text-sm text-red-400 hover:bg-dark-hover flex items-center gap-2"
            onClick={() => startDelete(contextMenu.item)}
          >
            <Trash2 className="w-4 h-4" />
            Delete
          </button>
        </div>
      )}
    </div>
  );
});

export { FileManagerLeftSidebar };