import React, { useMemo, useState } from "react";
import { createPortal } from "react-dom";
import {
  Table as UITable,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "../ui/table";
import { Button } from "../ui/button";
import {
  MoreVertical,
  ChevronRight,
  ChevronDown,
  Copy,
  Check,
} from "lucide-react";
import { __ } from "../../lib/i18n";
import { ConditionalRender } from "../ui/conditional-render";
import { ErrorRequestInfo } from "../../lib/errors";

interface TableColumn {
  key: string;
  label: string;
  sortable?: boolean;
  visible?: boolean;
  width?: string;
  render?: (item: any, index: number) => React.ReactNode;
}

interface TableAction {
  key: string;
  label: string;
  icon: React.ReactNode;
  onClick: (item: any) => void;
  condition?: (item: any) => boolean;
  variant?: "default" | "destructive" | "outline";
}

interface TableProps {
  data: any[];
  columns: TableColumn[];
  actions?: TableAction[];
  isLoading?: boolean;
  isError?: boolean;
  errorText?: string;
  emptyText?: string;
  emptyDescription?: string;
  onCreateClick?: () => void;
  onSort?: (field: string) => void;
  getSortIcon?: (field: string) => React.ReactNode;
  selectedItemIds?: (string | number)[];
  onSelectItem?: (id: string | number, checked: boolean) => void;
  onSelectAll?: (checked: boolean) => void;
  isAllSelected?: boolean;
  getItemId?: (item: any) => string | number;
  getItemStatus?: (item: any) => string;
  statusFilter?: string;
  capability?: string;
  skeletonRows?: number;
  errorDescription?: string;
  onRetry?: () => void;
  errorDetails?: string;
  errorRequestInfo?: ErrorRequestInfo;
  // Hierarchical support
  isHierarchical?: boolean;
  expandedIds?: Set<string | number>;
  onToggleExpand?: (id: string | number) => void;
  getChildren?: (item: any) => any[];
  renderRowContent?: (
    item: any,
    index: number,
    isChild?: boolean,
  ) => React.ReactNode[];
}

export const Table: React.FC<TableProps> = ({
  data,
  columns,
  actions = [],
  isLoading = false,
  isError = false,
  errorText = __("Error loading data", "yatra"),
  emptyText = __("No items found", "yatra"),
  emptyDescription = __("Get started by creating your first item.", "yatra"),
  onCreateClick,
  onSort,
  getSortIcon,
  selectedItemIds = [],
  onSelectItem,
  onSelectAll,
  isAllSelected = false,
  getItemId = (item) => item.id,
  getItemStatus = (item) => item.status,
  statusFilter = "",
  capability = "yatra_view_trips",
  skeletonRows = 5,
  errorDescription = __(
    "Something went wrong while loading this data. Please try again in a moment.",
    "yatra",
  ),
  onRetry,
  errorDetails,
  errorRequestInfo,
  // Hierarchical props
  isHierarchical = false,
  expandedIds = new Set(),
  onToggleExpand,
  getChildren,
  renderRowContent,
}) => {
  const [openDropdownId, setOpenDropdownId] = useState<string | number | null>(
    null,
  );
  const [dropdownPosition, setDropdownPosition] = useState<{
    top: number;
    right: number;
  } | null>(null);
  const [copied, setCopied] = useState(false);

  const handleRetry = () => {
    if (onRetry) {
      onRetry();
      return;
    }
    if (typeof window !== "undefined") {
      window.location.reload();
    }
  };

  // Close dropdown when clicking outside
  React.useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      const target = event.target as HTMLElement;
      if (
        target.closest("[data-dropdown-trigger]") ||
        target.closest("[data-dropdown-content]")
      ) {
        return;
      }
      setOpenDropdownId(null);
    };

    if (openDropdownId !== null) {
      document.addEventListener("click", handleClickOutside);
      return () => document.removeEventListener("click", handleClickOutside);
    }
  }, [openDropdownId]);

  const getVisibleActions = (item: any) =>
    actions.filter((a) => !a.condition || a.condition(item));

  const openActionsMenu = (
    e: React.MouseEvent<HTMLButtonElement>,
    item: any,
  ) => {
    e.preventDefault();
    e.stopPropagation();
    const itemId = getItemId(item);
    const rect = e.currentTarget.getBoundingClientRect();
    const visibleActions = getVisibleActions(item);
    const dropdownHeight = visibleActions.length * 40 + 16;
    const spaceBelow = window.innerHeight - rect.bottom;
    const spaceAbove = rect.top;
    const shouldPositionAbove =
      spaceBelow < dropdownHeight && spaceAbove > dropdownHeight;

    // position:fixed uses viewport coordinates; getBoundingClientRect is viewport-relative
    setDropdownPosition({
      top: shouldPositionAbove
        ? Math.max(8, rect.top - dropdownHeight)
        : rect.bottom,
      right: window.innerWidth - rect.right,
    });
    setOpenDropdownId(openDropdownId === itemId ? null : itemId);
  };

  const renderActionsDropdown = (item: any) => {
    const itemId = getItemId(item);
    if (openDropdownId !== itemId || !dropdownPosition) return null;

    return createPortal(
      <div
        className="fixed min-w-[180px] w-max bg-white dark:bg-gray-800 border border-gray-200 dark:border-gray-700 rounded-md shadow-md py-1"
        style={{
          top: `${dropdownPosition.top}px`,
          right: `${dropdownPosition.right}px`,
          zIndex: 999999,
        }}
        data-dropdown-content
        onClick={(e) => e.stopPropagation()}
      >
        {getVisibleActions(item).map((action) => (
          <button
            key={action.key}
            type="button"
            onClick={(e) => {
              e.preventDefault();
              e.stopPropagation();
              action.onClick(item);
              setOpenDropdownId(null);
            }}
            className={`w-full px-4 py-2 text-left text-sm hover:bg-gray-100 dark:hover:bg-gray-700 flex items-center gap-3 transition-colors cursor-pointer whitespace-nowrap ${
              action.variant === "destructive"
                ? "text-red-600 dark:text-red-400"
                : action.variant === "outline"
                  ? "text-blue-600 dark:text-blue-400"
                  : "text-gray-700 dark:text-gray-300"
            }`}
          >
            {action.icon}
            {action.label}
          </button>
        ))}
      </div>,
      document.body,
    );
  };

  // Render skeleton loading state
  const renderSkeleton = () => (
    <UITable>
      <TableHeader>
        <TableRow>
          {isHierarchical && <TableHead className="w-12"></TableHead>}
          {onSelectItem && onSelectAll && (
            <TableHead className="w-12"></TableHead>
          )}
          {columns
            .filter((col) => col.visible !== false)
            .map((column) => (
              <TableHead key={column.key} className={column.width}>
                {column.label}
              </TableHead>
            ))}
          {actions.length > 0 && (
            <TableHead className="text-right w-[100px]">
              {__("Actions", "yatra")}
            </TableHead>
          )}
        </TableRow>
      </TableHeader>
      <TableBody>
        {[...Array(skeletonRows)].map((_, index) => (
          <TableRow key={`skeleton-${index}`}>
            {isHierarchical && (
              <TableCell>
                <div className="w-4 h-4 bg-gray-100 dark:bg-gray-800 rounded animate-pulse" />
              </TableCell>
            )}
            {onSelectItem && onSelectAll && (
              <TableCell>
                <div className="w-4 h-4 bg-gray-100 dark:bg-gray-800 rounded animate-pulse" />
              </TableCell>
            )}
            {columns
              .filter((col) => col.visible !== false)
              .map((column) => (
                <TableCell key={`${column.key}-${index}`}>
                  <div className="h-4 bg-gray-100 dark:bg-gray-800 rounded animate-pulse" />
                </TableCell>
              ))}
            {actions.length > 0 && (
              <TableCell className="text-right">
                <div className="flex items-center justify-end gap-2">
                  <div className="h-4 w-4 bg-gray-100 dark:bg-gray-800 rounded animate-pulse" />
                </div>
              </TableCell>
            )}
          </TableRow>
        ))}
      </TableBody>
    </UITable>
  );

  // Render error state
  const composedErrorText = useMemo(() => {
    const parts: string[] = [];
    if (errorRequestInfo) {
      if (errorRequestInfo.method) {
        parts.push(`Request Method: ${errorRequestInfo.method}`);
      }
      if (errorRequestInfo.url) {
        parts.push(`Request URL: ${errorRequestInfo.url}`);
      }
      if (errorRequestInfo.payload) {
        parts.push(`Request Payload:\n${errorRequestInfo.payload}`);
      }
    }
    if (errorDetails) {
      parts.push(`Response:\n${errorDetails}`);
    }
    return parts.join("\n\n").trim();
  }, [errorRequestInfo, errorDetails]);

  const renderError = () => (
    <div className="relative flex flex-col items-center justify-center text-center py-14 px-6 my-4 min-h-[360px]">
      <div className="absolute inset-4 rounded-2xl border-2 border-dashed border-red-200/60 dark:border-red-900/50 bg-gradient-to-br from-red-50 via-orange-50/60 to-white dark:from-red-900/40 dark:via-orange-900/10 dark:to-gray-900 shadow-sm" />
      <div className="relative z-10 max-w-lg mx-auto space-y-6">
        <div className="inline-flex items-center justify-center w-24 h-24 rounded-2xl bg-gradient-to-br from-red-100 via-rose-50 to-orange-100 dark:from-red-900/50 dark:via-rose-800/30 dark:to-orange-900/40 ring-8 ring-red-100/70 dark:ring-red-900/30 shadow-lg">
          <svg
            className="w-12 h-12 text-red-500 dark:text-red-300"
            viewBox="0 0 24 24"
            fill="none"
            stroke="currentColor"
            strokeWidth="1.5"
          >
            <path
              strokeLinecap="round"
              strokeLinejoin="round"
              d="M12 9v4m0 4h.01M10.29 3.86L2.82 17a2 2 0 001.71 3h14.94a2 2 0 001.71-3L13.71 3.86a2 2 0 00-3.42 0z"
            />
          </svg>
        </div>

        <div className="space-y-3">
          <h3 className="text-2xl font-bold text-gray-900 dark:text-white">
            {errorText}
          </h3>
          <p className="text-base text-gray-600 dark:text-gray-400 leading-relaxed">
            {errorDescription}
          </p>
        </div>

        <div className="flex flex-col sm:flex-row items-center justify-center gap-3">
          <Button onClick={handleRetry} className="w-full sm:w-auto px-6">
            {__("Try again", "yatra")}
          </Button>
          <Button
            variant="outline"
            onClick={() => {
              if (typeof window !== "undefined") {
                window.open(
                  "https://wordpress.org/support/plugin/yatra",
                  "_blank",
                );
              }
            }}
            className="w-full sm:w-auto px-6 text-gray-700 dark:text-gray-200 border-gray-200 dark:border-gray-700"
          >
            {__("Visit support center", "yatra")}
          </Button>
        </div>

        {(errorDetails || errorRequestInfo) && (
          <div className="relative w-full text-left rounded-2xl border border-red-100/80 dark:border-red-900/40 bg-white/90 dark:bg-gray-900/70 shadow-inner space-y-0">
            <div className="flex items-center justify-between px-4 py-3 border-b border-red-50 dark:border-red-900/30">
              <p className="text-sm font-medium text-gray-700 dark:text-gray-300">
                {__("Technical details", "yatra")}
              </p>
              <Button
                type="button"
                size="sm"
                variant="ghost"
                className="flex items-center gap-2 text-gray-600 dark:text-gray-300 hover:text-gray-900"
                onClick={() => {
                  if (!navigator?.clipboard || !composedErrorText) {
                    return;
                  }
                  navigator.clipboard
                    .writeText(composedErrorText)
                    .then(() => {
                      setCopied(true);
                      setTimeout(() => setCopied(false), 2000);
                    })
                    .catch(() => {});
                }}
              >
                {copied ? (
                  <>
                    <Check className="w-4 h-4" />
                    {__("Copied", "yatra")}
                  </>
                ) : (
                  <>
                    <Copy className="w-4 h-4" />
                    {__("Copy details", "yatra")}
                  </>
                )}
              </Button>
            </div>
            {errorRequestInfo && (
              <div className="px-4 py-3 border-b border-red-50 dark:border-red-900/20 space-y-2 text-sm text-left text-gray-700 dark:text-gray-200">
                {errorRequestInfo.method && (
                  <div>
                    <span className="font-medium">
                      {__("Method:", "yatra")}
                    </span>{" "}
                    <span className="font-mono">{errorRequestInfo.method}</span>
                  </div>
                )}
                {errorRequestInfo.url && (
                  <div className="break-all">
                    <span className="font-medium">{__("URL:", "yatra")}</span>{" "}
                    <span className="font-mono">{errorRequestInfo.url}</span>
                  </div>
                )}
                {errorRequestInfo.payload && (
                  <div>
                    <span className="font-medium block mb-1">
                      {__("Payload:", "yatra")}
                    </span>
                    <pre className="max-h-40 overflow-auto px-3 py-2 rounded bg-red-50/60 dark:bg-red-900/30 text-xs font-mono text-gray-800 dark:text-gray-100 whitespace-pre-wrap">
                      {errorRequestInfo.payload}
                    </pre>
                  </div>
                )}
              </div>
            )}
            {errorDetails && (
              <pre className="max-h-56 overflow-auto px-4 py-3 text-xs leading-relaxed font-mono text-gray-700 dark:text-gray-200 whitespace-pre-wrap">
                {errorDetails}
              </pre>
            )}
          </div>
        )}
      </div>
    </div>
  );

  // Render empty state
  const renderEmpty = () => (
    <div className="relative flex flex-col items-center justify-center text-center py-12 px-6 my-4 min-h-[350px]">
      {/* Background decoration */}
      <div className="absolute inset-4 bg-gradient-to-br from-gray-50/80 via-blue-50/30 to-white dark:from-gray-900/80 dark:via-blue-900/20 dark:to-gray-800/80 rounded-2xl border-2 border-dashed border-gray-300/50 dark:border-gray-600/50 shadow-sm"></div>

      {/* Content */}
      <div className="relative z-10 max-w-lg mx-auto space-y-8">
        {/* Icon */}
        <div className="inline-flex items-center justify-center w-24 h-24 rounded-2xl bg-gradient-to-br from-blue-100 via-blue-50 to-indigo-100 dark:from-blue-900/40 dark:via-blue-800/20 dark:to-indigo-900/40 ring-8 ring-blue-100/60 dark:ring-blue-900/30 shadow-lg">
          <svg
            className="w-12 h-12 text-blue-600 dark:text-blue-400"
            fill="none"
            stroke="currentColor"
            viewBox="0 0 24 24"
            strokeWidth="1.5"
          >
            <path
              strokeLinecap="round"
              strokeLinejoin="round"
              d="M7 7h10v10H7zM5 3h14a2 2 0 012 2v14a2 2 0 01-2 2H5a2 2 0 01-2-2V5a2 2 0 012-2z"
            />
            <path
              strokeLinecap="round"
              strokeLinejoin="round"
              d="M9 9h6M9 12h6M9 15h4"
            />
          </svg>
        </div>

        {/* Text content */}
        <div className="space-y-4">
          <h3 className="text-2xl font-bold text-gray-900 dark:text-white">
            {emptyText}
          </h3>
          <p className="text-base text-gray-600 dark:text-gray-400 leading-relaxed max-w-md mx-auto">
            {emptyDescription}
          </p>
        </div>

        {/* Action button */}
        {onCreateClick && (
          <div className="pt-4">
            <Button
              onClick={onCreateClick}
              className="inline-flex items-center gap-3 px-8 py-3 bg-blue-600 hover:bg-blue-700 text-white text-base font-semibold rounded-xl shadow-lg hover:shadow-xl transition-all duration-200 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 dark:focus:ring-offset-gray-900 transform hover:scale-[1.02]"
            >
              <svg
                className="w-4 h-4"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
                strokeWidth="2"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  d="M12 4v16m8-8H4"
                />
              </svg>
              {__("Create New", "yatra")}
            </Button>
          </div>
        )}
      </div>
    </div>
  );

  // Render hierarchical row with children
  const renderHierarchicalRow = (
    item: any,
    index: number,
    isChild = false,
  ): React.ReactNode => {
    const itemId = getItemId(item);
    const itemStatus = getItemStatus(item);
    const isTrash = itemStatus === "trash" || statusFilter === "trash";
    const children = getChildren ? getChildren(item) : [];
    const hasChildren = children.length > 0;
    const isExpanded = expandedIds.has(itemId);

    return (
      <React.Fragment key={itemId}>
        <TableRow
          className={`${isTrash ? "bg-red-50/30 dark:bg-red-900/10 opacity-75 hover:bg-red-50/50 dark:hover:bg-red-900/20" : ""} ${isChild ? "bg-gray-50 dark:bg-gray-900/50" : ""}`}
        >
          {/* Expand/collapse column */}
          <TableCell className="w-12">
            {hasChildren && onToggleExpand && (
              <button
                onClick={() => onToggleExpand(itemId)}
                className="p-1 hover:bg-gray-200 dark:hover:bg-gray-700 rounded"
              >
                {isExpanded ? (
                  <ChevronDown className="w-4 h-4" />
                ) : (
                  <ChevronRight className="w-4 h-4" />
                )}
              </button>
            )}
          </TableCell>

          {/* Selection checkbox */}
          {onSelectItem && (
            <TableCell>
              <input
                type="checkbox"
                className="rounded border-gray-300 dark:border-gray-600"
                checked={selectedItemIds.includes(itemId)}
                onChange={(e) => onSelectItem(itemId, e.target.checked)}
                aria-label={__("Select item", "yatra")}
              />
            </TableCell>
          )}

          {/* Custom row content or default columns */}
          {renderRowContent
            ? renderRowContent(item, index, isChild).map(
                (cellContent, cellIndex) => (
                  <TableCell
                    key={`cell-${itemId}-${cellIndex}`}
                    className={
                      isTrash ? "text-gray-400 dark:text-gray-600" : ""
                    }
                  >
                    {cellContent}
                  </TableCell>
                ),
              )
            : columns
                .filter((col) => col.visible !== false)
                .map((column) => (
                  <TableCell
                    key={`${column.key}-${itemId}`}
                    className={
                      isTrash ? "text-gray-400 dark:text-gray-600" : ""
                    }
                  >
                    {column.render
                      ? column.render(item, index)
                      : item[column.key]}
                  </TableCell>
                ))}

          {/* Actions */}
          {actions.length > 0 && (
            <TableCell className="text-right">
              <div className="relative inline-block">
                <Button
                  variant="ghost"
                  size="icon"
                  onClick={(e) => openActionsMenu(e, item)}
                  className="h-8 w-8 hover:bg-gray-100 dark:hover:bg-gray-700"
                  aria-label={__("More actions", "yatra")}
                  data-dropdown-trigger
                >
                  <MoreVertical className="w-4 h-4" />
                </Button>
                {renderActionsDropdown(item)}
              </div>
            </TableCell>
          )}
        </TableRow>

        {/* Render children if expanded */}
        {hasChildren &&
          isExpanded &&
          children.map((child, childIndex) =>
            renderHierarchicalRow(child, childIndex, true),
          )}
      </React.Fragment>
    );
  };

  // Render flat row (original behavior)
  const renderFlatRow = (item: any, index: number): React.ReactNode => {
    const itemId = getItemId(item);
    const itemStatus = getItemStatus(item);
    const isTrash = itemStatus === "trash" || statusFilter === "trash";

    return (
      <TableRow
        key={itemId}
        className={
          isTrash
            ? "bg-red-50/30 dark:bg-red-900/10 opacity-75 hover:bg-red-50/50 dark:hover:bg-red-900/20"
            : ""
        }
      >
        {onSelectItem && (
          <TableCell>
            <input
              type="checkbox"
              className="rounded border-gray-300 dark:border-gray-600"
              checked={selectedItemIds.includes(itemId)}
              onChange={(e) => onSelectItem(itemId, e.target.checked)}
              aria-label={__("Select item", "yatra")}
            />
          </TableCell>
        )}
        {columns
          .filter((col) => col.visible !== false)
          .map((column) => (
            <TableCell
              key={`${column.key}-${itemId}`}
              className={isTrash ? "text-gray-400 dark:text-gray-600" : ""}
            >
              {column.render ? column.render(item, index) : item[column.key]}
            </TableCell>
          ))}
        {actions.length > 0 && (
          <TableCell className="text-right">
            <div className="relative inline-block">
              <Button
                variant="ghost"
                size="icon"
                onClick={(e) => openActionsMenu(e, item)}
                className="h-8 w-8 hover:bg-gray-100 dark:hover:bg-gray-700"
                aria-label={__("More actions", "yatra")}
                data-dropdown-trigger
              >
                <MoreVertical className="w-4 h-4" />
              </Button>
              {renderActionsDropdown(item)}
            </div>
          </TableCell>
        )}
      </TableRow>
    );
  };

  // Render table data
  const renderTable = () => {
    if (isLoading) return renderSkeleton();
    if (isError) return renderError();
    if (data.length === 0) return renderEmpty();

    return (
      <UITable>
        <TableHeader>
          <TableRow>
            {/* Expand/collapse column for hierarchical tables */}
            {isHierarchical && <TableHead className="w-12"></TableHead>}
            {onSelectItem && onSelectAll && (
              <TableHead className="w-12">
                <input
                  type="checkbox"
                  className="rounded border-gray-300 dark:border-gray-600"
                  checked={isAllSelected}
                  onChange={(e) => onSelectAll(e.target.checked)}
                  aria-label={__("Select all items", "yatra")}
                />
              </TableHead>
            )}
            {columns
              .filter((col) => col.visible !== false)
              .map((column) => (
                <TableHead key={column.key} className={column.width}>
                  {column.sortable && onSort ? (
                    <button
                      onClick={() => onSort(column.key)}
                      className="flex items-center hover:text-gray-900 dark:hover:text-white transition-colors"
                    >
                      {column.label}
                      {getSortIcon && getSortIcon(column.key)}
                    </button>
                  ) : (
                    column.label
                  )}
                </TableHead>
              ))}
            {actions.length > 0 && (
              <TableHead className="text-right w-[100px]">
                {__("Actions", "yatra")}
              </TableHead>
            )}
          </TableRow>
        </TableHeader>
        <TableBody>
          {data.map((item, index) =>
            isHierarchical
              ? renderHierarchicalRow(item, index)
              : renderFlatRow(item, index),
          )}
        </TableBody>
      </UITable>
    );
  };

  return (
    <ConditionalRender capability={capability}>
      {renderTable()}
    </ConditionalRender>
  );
};