import { useState, useEffect, useMemo } from "react";
import toast from "react-hot-toast";
import { LayoutGrid, List } from "lucide-react";

import {
  AnimatedPage,
  StaggerList,
  StaggerItem,
} from "@/components/animated-page";
import { SearchBar } from "@/components/search-bar";
import { Card, CardBody, CardHeader } from "@/shadcn-bridge/heroui/card";
import { Button } from "@/shadcn-bridge/heroui/button";
import { Input } from "@/shadcn-bridge/heroui/input";
import {
  Modal,
  ModalContent,
  ModalHeader,
  ModalBody,
  ModalFooter,
} from "@/shadcn-bridge/heroui/modal";
import { Chip } from "@/shadcn-bridge/heroui/chip";
import {
  Table,
  TableHeader,
  TableColumn,
  TableBody,
  TableRow,
  TableCell,
} from "@/shadcn-bridge/heroui/table";
import {
  createSpeedLimit,
  getSpeedLimitList,
  updateSpeedLimit,
  deleteSpeedLimit,
} from "@/api";
import { PageLoadingState } from "@/components/page-state";
import { useLocalStorageState } from "@/hooks/use-local-storage-state";

interface SpeedLimitRule {
  id: number;
  name: string;
  speed: number;
  status: number;
  createdTime: string;
  updatedTime: string;
}

interface SpeedLimitForm {
  id?: number;
  name: string;
  speed: number;
  status: number;
}

export default function LimitPage() {
  const [loading, setLoading] = useState(true);
  const [rules, setRules] = useState<SpeedLimitRule[]>([]);
  const [searchKeyword, setSearchKeyword] = useLocalStorageState(
    "limit-search-keyword",
    "",
  );
  const [isSearchVisible, setIsSearchVisible] = useState(false);
  const [viewMode, setViewMode] = useLocalStorageState<"list" | "grid">(
    "limit-view-mode",
    "grid",
  );

  const filteredRules = useMemo(() => {
    if (!searchKeyword.trim()) return rules;
    const lowerKeyword = searchKeyword.toLowerCase();

    return rules.filter(
      (r) => r.name && r.name.toLowerCase().includes(lowerKeyword),
    );
  }, [rules, searchKeyword]);

  // 模态框状态
  const [modalOpen, setModalOpen] = useState(false);
  const [deleteModalOpen, setDeleteModalOpen] = useState(false);
  const [isEdit, setIsEdit] = useState(false);
  const [submitLoading, setSubmitLoading] = useState(false);
  const [deleteLoading, setDeleteLoading] = useState(false);
  const [ruleToDelete, setRuleToDelete] = useState<SpeedLimitRule | null>(null);

  // 表单状态
  const [form, setForm] = useState<SpeedLimitForm>({
    name: "",
    speed: 100,
    status: 1,
  });

  // 表单验证错误
  const [errors, setErrors] = useState<{ [key: string]: string }>({});

  useEffect(() => {
    loadData();
  }, []);

  // 加载所有数据
  const loadData = async () => {
    setLoading(true);
    try {
      const rulesRes = await getSpeedLimitList();

      if (rulesRes.code === 0) {
        setRules(rulesRes.data || []);
      } else {
        toast.error(rulesRes.msg || "获取限速规则失败");
      }
    } catch {
      toast.error("加载数据失败");
    } finally {
      setLoading(false);
    }
  };

  // 表单验证
  const validateForm = (): boolean => {
    const newErrors: { [key: string]: string } = {};

    if (!form.name.trim()) {
      newErrors.name = "请输入规则名称";
    } else if (form.name.length < 2 || form.name.length > 50) {
      newErrors.name = "规则名称长度应在2-50个字符之间";
    }

    if (!form.speed || form.speed < 1) {
      newErrors.speed = "请输入有效的速度限制（≥1 Mbps）";
    }

    setErrors(newErrors);

    return Object.keys(newErrors).length === 0;
  };

  // 新增规则
  const handleAdd = () => {
    setIsEdit(false);
    setForm({
      name: "",
      speed: 100,
      status: 1,
    });
    setErrors({});
    setModalOpen(true);
  };

  // 编辑规则
  const handleEdit = (rule: SpeedLimitRule) => {
    setIsEdit(true);
    setForm({
      id: rule.id,
      name: rule.name,
      speed: rule.speed,
      status: rule.status,
    });
    setErrors({});
    setModalOpen(true);
  };

  // 显示删除确认
  const handleDelete = (rule: SpeedLimitRule) => {
    setRuleToDelete(rule);
    setDeleteModalOpen(true);
  };

  // 确认删除规则
  const confirmDelete = async () => {
    if (!ruleToDelete) return;

    setDeleteLoading(true);
    try {
      const res = await deleteSpeedLimit(ruleToDelete.id);

      if (res.code === 0) {
        toast.success("删除成功");
        setDeleteModalOpen(false);
        loadData();
      } else {
        toast.error(res.msg || "删除失败");
      }
    } catch {
      toast.error("删除失败");
    } finally {
      setDeleteLoading(false);
    }
  };

  // 提交表单
  const handleSubmit = async () => {
    if (!validateForm()) return;

    setSubmitLoading(true);
    try {
      let res: { code: number; msg: string };
      const payload = {
        id: form.id,
        name: form.name,
        speed: form.speed,
        status: form.status,
      };

      if (isEdit) {
        res = await updateSpeedLimit(payload);
      } else {
        const createData = {
          name: payload.name,
          speed: payload.speed,
          status: payload.status,
        };

        res = await createSpeedLimit(createData);
      }

      if (res.code === 0) {
        toast.success(isEdit ? "修改成功" : "创建成功");
        setModalOpen(false);
        loadData();
      } else {
        toast.error(res.msg || "操作失败");
      }
    } catch {
      toast.error("操作失败");
    } finally {
      setSubmitLoading(false);
    }
  };

  if (loading) {
    return <PageLoadingState message="正在加载..." />;
  }

  return (
    <AnimatedPage className="px-3 lg:px-6 py-8">
      <div className="flex flex-col sm:flex-row items-stretch sm:items-center justify-between mb-6 gap-3">
        <div className="flex-1 max-w-sm flex items-center gap-2">
          <SearchBar
            isVisible={isSearchVisible}
            placeholder="搜索规则名称"
            value={searchKeyword}
            onChange={setSearchKeyword}
            onClose={() => setIsSearchVisible(false)}
            onOpen={() => setIsSearchVisible(true)}
          />
        </div>

        <div className="flex items-center gap-2">
          <Button
            isIconOnly
            size="sm"
            variant="flat"
            onPress={() => setViewMode(viewMode === "list" ? "grid" : "list")}
          >
            {viewMode === "list" ? (
              <LayoutGrid className="w-4 h-4" />
            ) : (
              <List className="w-4 h-4" />
            )}
          </Button>
          <Button color="primary" size="sm" variant="flat" onPress={handleAdd}>
            新增
          </Button>
        </div>
      </div>

      {/* 统一卡片网格 */}
      {filteredRules.length > 0 ? (
        viewMode === "list" ? (
          <Card>
            <Table
              aria-label="限速规则列表"
              className="overflow-x-auto min-w-full"
              classNames={{
                wrapper:
                  "bg-transparent p-0 shadow-none border-none overflow-hidden rounded-[24px]",
                th: "bg-transparent text-default-600 font-semibold text-sm border-b border-white/20 dark:border-white/10 py-3 uppercase tracking-wider first:rounded-tl-[24px] last:rounded-tr-[24px]",
                td: "py-3 border-b border-divider/50 group-data-[last=true]:border-b-0",
                tr: "hover:bg-white/40 dark:hover:bg-white/10 transition-colors",
              }}
            >
              <TableHeader>
                <TableColumn>规则名称</TableColumn>
                <TableColumn>速度限制</TableColumn>
                <TableColumn>操作</TableColumn>
              </TableHeader>
              <TableBody items={filteredRules}>
                {(rule) => (
                  <TableRow key={rule.id}>
                    <TableCell>
                      <div className="flex items-center gap-2">
                        <div
                          className={`shrink-0 w-2 h-2 rounded-full ${
                            rule.status === 1 ? "bg-success" : "bg-danger"
                          }`}
                        />
                        <span className="font-medium text-foreground text-sm">
                          {rule.name}
                        </span>
                      </div>
                    </TableCell>
                    <TableCell>
                      <span className="text-sm font-mono text-default-600">
                        {rule.speed} Mbps
                      </span>
                    </TableCell>
                    <TableCell>
                      <div className="flex flex-wrap items-center gap-1.5 min-w-max">
                        <Button
                          className="h-6 px-2 min-w-0 text-xs bg-indigo-50 text-indigo-600 hover:bg-indigo-100 dark:bg-indigo-950/30 dark:text-indigo-400"
                          size="sm"
                          variant="flat"
                          onPress={() => handleEdit(rule)}
                        >
                          编辑
                        </Button>
                        <Button
                          className="h-6 px-2 min-w-0 text-xs bg-rose-50 text-rose-600 hover:bg-rose-100 dark:bg-rose-950/30 dark:text-rose-400"
                          size="sm"
                          variant="flat"
                          onPress={() => handleDelete(rule)}
                        >
                          删除
                        </Button>
                      </div>
                    </TableCell>
                  </TableRow>
                )}
              </TableBody>
            </Table>
          </Card>
        ) : (
          <StaggerList className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 2xl:grid-cols-5 gap-4">
            {filteredRules.map((rule) => (
              <StaggerItem key={rule.id}>
                <Card className="shadow-sm overflow-hidden h-full">
                  <CardHeader className="pb-2 md:pb-2">
                    <div className="flex justify-between items-start w-full">
                      <div>
                        <h3 className="font-semibold text-foreground">
                          {rule.name}
                        </h3>
                      </div>
                      <Chip
                        color={rule.status === 1 ? "success" : "danger"}
                        size="sm"
                        variant="flat"
                      >
                        {rule.status === 1 ? "运行" : "异常"}
                      </Chip>
                    </div>
                  </CardHeader>
                  <CardBody className="pt-0 pb-3 md:pt-0 md:pb-3">
                    <div className="space-y-3">
                      <div className="flex justify-between items-center">
                        <span className="text-small text-default-600">
                          速度限制
                        </span>
                        <Chip color="secondary" size="sm" variant="flat">
                          {rule.speed} Mbps
                        </Chip>
                      </div>
                    </div>

                    <div className="flex gap-2 mt-4">
                      <Button
                        className="flex-1"
                        color="primary"
                        size="sm"
                        startContent={
                          <svg
                            aria-hidden="true"
                            className="w-4 h-4"
                            fill="currentColor"
                            viewBox="0 0 20 20"
                          >
                            <path d="M13.586 3.586a2 2 0 112.828 2.828l-.793.793-2.828-2.828.793-.793zM11.379 5.793L3 14.172V17h2.828l8.38-8.379-2.83-2.828z" />
                          </svg>
                        }
                        variant="flat"
                        onPress={() => handleEdit(rule)}
                      >
                        编辑
                      </Button>
                      <Button
                        className="flex-1"
                        color="danger"
                        size="sm"
                        startContent={
                          <svg
                            aria-hidden="true"
                            className="w-4 h-4"
                            fill="currentColor"
                            viewBox="0 0 20 20"
                          >
                            <path
                              clipRule="evenodd"
                              d="M9 2a1 1 0 000 2h2a1 1 0 100-2H9z"
                              fillRule="evenodd"
                            />
                            <path
                              clipRule="evenodd"
                              d="M10 18a8 8 0 100-16 8 8 0 000 16zM8 7a1 1 0 012 0v4a1 1 0 11-2 0V7zM12 7a1 1 0 012 0v4a1 1 0 11-2 0V7z"
                              fillRule="evenodd"
                            />
                          </svg>
                        }
                        variant="flat"
                        onPress={() => handleDelete(rule)}
                      >
                        删除
                      </Button>
                    </div>
                  </CardBody>
                </Card>
              </StaggerItem>
            ))}
          </StaggerList>
        )
      ) : (
        /* 空状态 */
        <Card className="shadow-sm bg-default-50/50">
          <CardBody className="text-center py-20 flex flex-col items-center justify-center min-h-[240px]">
            <h3 className="text-xl font-medium text-foreground tracking-tight mb-2">
              暂无限速规则
            </h3>
            <p className="text-default-500 text-sm max-w-xs mx-auto leading-relaxed">
              还没有创建任何限速规则，点击上方按钮开始创建
            </p>
          </CardBody>
        </Card>
      )}

      {/* 新增/编辑模态框 */}
      <Modal
        backdrop="blur"
        classNames={{
          base: "!w-[calc(100%-32px)] !mx-auto sm:!w-full rounded-2xl overflow-hidden",
        }}
        isOpen={modalOpen}
        placement="center"
        scrollBehavior="inside"
        size="2xl"
        onOpenChange={setModalOpen}
      >
        <ModalContent>
          {(onClose) => (
            <>
              <ModalHeader className="flex flex-col gap-1">
                <h2 className="text-xl font-bold">
                  {isEdit ? "编辑限速规则" : "新增限速规则"}
                </h2>
                <p className="text-small text-default-500">
                  {isEdit ? "修改现有限速规则的配置信息" : "创建新的限速规则"}
                </p>
              </ModalHeader>
              <ModalBody>
                <div className="space-y-4">
                  <Input
                    errorMessage={errors.name}
                    isInvalid={!!errors.name}
                    label="规则名称"
                    placeholder="请输入限速规则名称"
                    value={form.name}
                    variant="bordered"
                    onChange={(e) =>
                      setForm((prev) => ({ ...prev, name: e.target.value }))
                    }
                  />

                  <Input
                    endContent={
                      <div className="pointer-events-none flex items-center">
                        <span className="text-default-400 text-small">
                          Mbps
                        </span>
                      </div>
                    }
                    errorMessage={errors.speed}
                    isInvalid={!!errors.speed}
                    label="速度限制"
                    placeholder="请输入速度限制"
                    type="number"
                    value={form.speed.toString()}
                    variant="bordered"
                    onChange={(e) =>
                      setForm((prev) => ({
                        ...prev,
                        speed: parseInt(e.target.value) || 0,
                      }))
                    }
                  />
                </div>
              </ModalBody>
              <ModalFooter>
                <Button variant="light" onPress={onClose}>
                  取消
                </Button>
                <Button
                  color="primary"
                  isLoading={submitLoading}
                  onPress={handleSubmit}
                >
                  {isEdit ? "保存修改" : "创建规则"}
                </Button>
              </ModalFooter>
            </>
          )}
        </ModalContent>
      </Modal>

      {/* 删除确认模态框 */}
      <Modal
        backdrop="blur"
        classNames={{
          base: "!w-[calc(100%-32px)] !mx-auto sm:!w-full rounded-2xl overflow-hidden",
        }}
        isOpen={deleteModalOpen}
        placement="center"
        scrollBehavior="inside"
        size="2xl"
        onOpenChange={setDeleteModalOpen}
      >
        <ModalContent>
          {(onClose) => (
            <>
              <ModalHeader className="flex flex-col gap-1">
                <h2 className="text-lg font-bold text-danger">确认删除</h2>
              </ModalHeader>
              <ModalBody>
                <p className="text-default-600">
                  确定要删除限速规则{" "}
                  <span className="font-semibold text-foreground">
                    &quot;{ruleToDelete?.name}&quot;
                  </span>{" "}
                  吗？
                </p>
                <p className="text-small text-default-500 mt-2">
                  此操作无法撤销，删除后该规则将永久消失。
                </p>
              </ModalBody>
              <ModalFooter>
                <Button variant="light" onPress={onClose}>
                  取消
                </Button>
                <Button
                  color="danger"
                  isLoading={deleteLoading}
                  onPress={confirmDelete}
                >
                  确认删除
                </Button>
              </ModalFooter>
            </>
          )}
        </ModalContent>
      </Modal>
    </AnimatedPage>
  );
}