import { useEffect, useState } from "react";
import {
  faArrowUpRightFromSquare,
  faBookOpen,
  faCheck,
  faCheckCircle,
  faChevronDown,
  faCodeBranch,
  faCodeMerge,
  faMagnifyingGlass,
  faSearch,
  faXmark
} from "@fortawesome/free-solid-svg-icons";
import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
import { useSearch } from "@tanstack/react-router";
import { format, formatDistance } from "date-fns";
import { twMerge } from "tailwind-merge";

import {
  Badge,
  Button,
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuTrigger,
  EmptyState,
  Input,
  Pagination,
  Skeleton,
  Tooltip
} from "@app/components/v2";
import { ROUTE_PATHS } from "@app/const/routes";
import {
  ProjectPermissionMemberActions,
  ProjectPermissionSub,
  useProject,
  useProjectPermission,
  useUser
} from "@app/context";
import {
  getUserTablePreference,
  PreferenceKey,
  setUserTablePreference
} from "@app/helpers/userTablePreferences";
import { usePagination } from "@app/hooks";
import {
  useGetSecretApprovalRequestCount,
  useGetSecretApprovalRequests,
  useGetWorkspaceUsers
} from "@app/hooks/api";
import { ApprovalStatus } from "@app/hooks/api/types";

import {
  generateCommitText,
  SecretApprovalRequestChanges
} from "./components/SecretApprovalRequestChanges";

export const SecretApprovalRequest = () => {
  const { currentProject, projectId } = useProject();
  const [selectedApprovalId, setSelectedApprovalId] = useState<string | null>(null);

  // filters
  const [statusFilter, setStatusFilter] = useState<"open" | "close">("open");
  const [envFilter, setEnvFilter] = useState<string>();
  const [committerFilter, setCommitterFilter] = useState<string>();
  const [usingUrlRequestId, setUsingUrlRequestId] = useState(false);

  const {
    debouncedSearch: debouncedSearchFilter,
    search: searchFilter,
    setSearch: setSearchFilter,
    setPage,
    page,
    perPage,
    setPerPage,
    offset,
    limit
  } = usePagination("", {
    initPerPage: getUserTablePreference("changeRequestsTable", PreferenceKey.PerPage, 20)
  });

  const handlePerPageChange = (newPerPage: number) => {
    setPerPage(newPerPage);
    setUserTablePreference("changeRequestsTable", PreferenceKey.PerPage, newPerPage);
  };

  const {
    data,
    isPending: isApprovalRequestLoading,
    refetch
  } = useGetSecretApprovalRequests({
    projectId,
    status: statusFilter,
    environment: envFilter,
    committer: committerFilter,
    search: debouncedSearchFilter,
    limit,
    offset
  });

  const totalApprovalCount = data?.totalCount ?? 0;
  const secretApprovalRequests = data?.approvals ?? [];

  const { data: secretApprovalRequestCount, isSuccess: isSecretApprovalReqCountSuccess } =
    useGetSecretApprovalRequestCount({ projectId });
  const { user: userSession } = useUser();
  const search = useSearch({
    from: ROUTE_PATHS.SecretManager.ApprovalPage.id
  });

  const { permission } = useProjectPermission();
  const { data: members } = useGetWorkspaceUsers(projectId);
  const isSecretApprovalScreen = Boolean(selectedApprovalId);
  const { requestId } = search;

  useEffect(() => {
    if (!requestId || usingUrlRequestId) return;

    setSelectedApprovalId(requestId as string);
    setUsingUrlRequestId(true);
  }, [requestId]);

  const handleGoBackSecretRequestDetail = () => {
    setSelectedApprovalId(null);
    refetch();
  };

  const isRequestListEmpty = !isApprovalRequestLoading && secretApprovalRequests?.length === 0;

  const isFiltered = Boolean(searchFilter || envFilter || committerFilter);

  return isSecretApprovalScreen ? (
    <SecretApprovalRequestChanges
      approvalRequestId={selectedApprovalId || ""}
      onGoBack={handleGoBackSecretRequestDetail}
    />
  ) : (
    <div className="w-full rounded-lg border border-mineshaft-600 bg-mineshaft-900 p-4">
      <div className="mb-4 flex items-center justify-between">
        <div>
          <div className="flex items-start gap-1">
            <p className="text-xl font-medium text-mineshaft-100">Change Requests</p>
            <a
              href="https://infisical.com/docs/documentation/platform/pr-workflows"
              target="_blank"
              rel="noopener noreferrer"
            >
              <div className="mt-[0.32rem] ml-1 inline-block rounded-md bg-yellow/20 px-1.5 text-sm text-yellow opacity-80 hover:opacity-100">
                <FontAwesomeIcon icon={faBookOpen} className="mr-1.5" />
                <span>Docs</span>
                <FontAwesomeIcon
                  icon={faArrowUpRightFromSquare}
                  className="mb-[0.07rem] ml-1.5 text-[10px]"
                />
              </div>
            </a>
          </div>
          <p className="text-sm text-bunker-300">Review pending and closed change requests</p>
        </div>
      </div>
      <Input
        value={searchFilter}
        onChange={(e) => setSearchFilter(e.target.value)}
        leftIcon={<FontAwesomeIcon icon={faMagnifyingGlass} />}
        placeholder="Search change requests by author, environment or policy path..."
        className="flex-1"
        containerClassName="mb-4"
      />
      <div className="flex items-center space-x-8 rounded-t-md border-x border-t border-mineshaft-600 bg-mineshaft-800 px-8 py-3 text-sm">
        <div
          role="button"
          tabIndex={0}
          onClick={() => setStatusFilter("open")}
          onKeyDown={(evt) => {
            if (evt.key === "Enter") setStatusFilter("open");
          }}
          className={twMerge(
            "font-medium",
            statusFilter === "close" && "text-gray-500 duration-100 hover:text-gray-400"
          )}
        >
          <FontAwesomeIcon icon={faCodeBranch} className="mr-2" />
          {isSecretApprovalReqCountSuccess && secretApprovalRequestCount?.open} Open
        </div>
        <div
          className={twMerge(
            "font-medium",
            statusFilter === "open" && "text-gray-500 duration-100 hover:text-gray-400"
          )}
          role="button"
          tabIndex={0}
          onClick={() => setStatusFilter("close")}
          onKeyDown={(evt) => {
            if (evt.key === "Enter") setStatusFilter("close");
          }}
        >
          <FontAwesomeIcon icon={faCheck} className="mr-2" />
          {isSecretApprovalReqCountSuccess && secretApprovalRequestCount.closed} Closed
        </div>
        <div className="flex grow justify-end space-x-8">
          <DropdownMenu>
            <DropdownMenuTrigger asChild>
              <Button
                variant="plain"
                colorSchema="secondary"
                className={envFilter ? "text-white" : "text-bunker-300"}
                rightIcon={<FontAwesomeIcon icon={faChevronDown} size="sm" className="ml-2" />}
              >
                Environments
              </Button>
            </DropdownMenuTrigger>
            <DropdownMenuContent
              align="end"
              sideOffset={1}
              className="max-h-80 thin-scrollbar overflow-y-auto"
            >
              <DropdownMenuLabel className="sticky top-0 bg-mineshaft-900">
                Select an Environment
              </DropdownMenuLabel>
              {currentProject?.environments.map(({ slug, name }) => (
                <DropdownMenuItem
                  onClick={() => setEnvFilter((state) => (state === slug ? undefined : slug))}
                  key={`request-filter-${slug}`}
                  icon={envFilter === slug && <FontAwesomeIcon icon={faCheckCircle} />}
                  iconPos="right"
                >
                  {name}
                </DropdownMenuItem>
              ))}
            </DropdownMenuContent>
          </DropdownMenu>
          {!!permission.can(ProjectPermissionMemberActions.Read, ProjectPermissionSub.Member) && (
            <DropdownMenu>
              <DropdownMenuTrigger>
                <Button
                  variant="plain"
                  colorSchema="secondary"
                  className={committerFilter ? "text-white" : "text-bunker-300"}
                  rightIcon={<FontAwesomeIcon icon={faChevronDown} size="sm" className="ml-2" />}
                >
                  Author
                </Button>
              </DropdownMenuTrigger>
              <DropdownMenuContent
                align="end"
                sideOffset={1}
                className="max-h-80 thin-scrollbar overflow-y-auto"
              >
                <DropdownMenuLabel className="sticky top-0 bg-mineshaft-900">
                  Select an Author
                </DropdownMenuLabel>
                {members?.map(({ user, id }) => (
                  <DropdownMenuItem
                    onClick={() =>
                      setCommitterFilter((state) => (state === user.id ? undefined : user.id))
                    }
                    key={`request-filter-member-${id}`}
                    icon={committerFilter === user.id && <FontAwesomeIcon icon={faCheckCircle} />}
                    iconPos="right"
                  >
                    {user.username}
                  </DropdownMenuItem>
                ))}
              </DropdownMenuContent>
            </DropdownMenu>
          )}
        </div>
      </div>
      <div className="flex flex-col rounded-b-md border-x border-t border-b border-mineshaft-600 bg-mineshaft-800">
        {isRequestListEmpty && !isFiltered && (
          <div className="py-12">
            <EmptyState
              title={`No ${statusFilter === "open" ? "Open" : "Closed"} Change Requests`}
            />
          </div>
        )}
        {secretApprovalRequests.map((secretApproval) => {
          const {
            id: reqId,
            commits,
            createdAt,
            reviewers,
            status,
            committerUser,
            hasMerged,
            updatedAt
          } = secretApproval;
          const isReviewed = reviewers.some(
            ({ status: reviewStatus, userId }) =>
              userId === userSession.id && reviewStatus === ApprovalStatus.APPROVED
          );
          return (
            <div
              key={reqId}
              className="flex border-b border-mineshaft-600 px-8 py-3 last:border-b-0 hover:bg-mineshaft-700"
              role="button"
              tabIndex={0}
              onClick={() => setSelectedApprovalId(secretApproval.id)}
              onKeyDown={(evt) => {
                if (evt.key === "Enter") setSelectedApprovalId(secretApproval.id);
              }}
            >
              <div className="flex flex-col">
                <div className="mb-1 text-sm">
                  <FontAwesomeIcon
                    icon={faCodeBranch}
                    size="sm"
                    className="mr-1.5 text-mineshaft-300"
                  />
                  {secretApproval.isReplicated
                    ? `${commits.length} secret pending import`
                    : generateCommitText(commits)}
                  <span className="text-xs text-bunker-300"> #{secretApproval.slug}</span>
                </div>
                <span className="text-xs leading-3 text-gray-500">
                  Opened {formatDistance(new Date(createdAt), new Date())} ago by{" "}
                  {committerUser ? (
                    <>
                      {committerUser?.firstName || ""} {committerUser?.lastName || ""} (
                      {committerUser?.email})
                    </>
                  ) : (
                    <span className="text-gray-600">Deleted User</span>
                  )}
                  {!isReviewed && status === "open" && " - Review required"}
                </span>
              </div>
              {status === "close" && (
                <Tooltip content={updatedAt ? format(new Date(updatedAt), "M/dd/yyyy h:mm a") : ""}>
                  <div className="my-auto ml-auto">
                    <Badge
                      variant={hasMerged ? "success" : "danger"}
                      className="flex h-min items-center gap-1"
                    >
                      <FontAwesomeIcon icon={hasMerged ? faCodeMerge : faXmark} />
                      {hasMerged ? "Merged" : "Rejected"}
                    </Badge>
                  </div>
                </Tooltip>
              )}
            </div>
          );
        })}
        {Boolean(!secretApprovalRequests.length && isFiltered && !isApprovalRequestLoading) && (
          <div className="py-12">
            <EmptyState title="No Requests Match Filters" icon={faSearch} />
          </div>
        )}
        {Boolean(totalApprovalCount) && (
          <Pagination
            className="border-none"
            count={totalApprovalCount}
            page={page}
            perPage={perPage}
            onChangePage={setPage}
            onChangePerPage={handlePerPageChange}
          />
        )}
        {isApprovalRequestLoading && (
          <div>
            {Array.apply(0, Array(3)).map((_x, index) => (
              <div
                key={`approval-request-loading-${index + 1}`}
                className="flex flex-col px-8 py-4 hover:bg-mineshaft-700"
              >
                <div className="mb-2 flex items-center">
                  <FontAwesomeIcon icon={faCodeBranch} className="mr-2" />
                  <Skeleton className="w-1/4 bg-mineshaft-600" />
                </div>
                <Skeleton className="w-1/2 bg-mineshaft-600" />
              </div>
            ))}
          </div>
        )}
      </div>
    </div>
  );
};