import { useState } from "react";
import { Button, Form, Input, Message, Modal, Space, Table, Tag } from "@arco-design/web-react";
import { IconPlus } from "@arco-design/web-react/icon";
import { roleApi } from "../api";
import { usePageData } from "../hooks/usePageData";
import { Panel } from "../components/Panel";
import { PermissionTreePicker } from "./components/PermissionTreePicker";
import type { CreateRoleFormValues, Permission, Role } from "./interface";

function RolesPage() {
    const { data, loading, reload, changePage } = usePageData<Role>(roleApi.listRoles, { page: 1, pageSize: 20 });
    const permissions = usePageData<Permission>(roleApi.listPermissions, { page: 1, pageSize: 20 });
    const [createForm] = Form.useForm();
    const [createVisible, setCreateVisible] = useState(false);
    const [creatingRole, setCreatingRole] = useState(false);
    const [createPermissionIds, setCreatePermissionIds] = useState<number[]>([]);
    const [assignmentVisible, setAssignmentVisible] = useState(false);
    const [selectedRole, setSelectedRole] = useState<Role | null>(null);
    const [selectedPermissionIds, setSelectedPermissionIds] = useState<number[]>([]);
    const [savingPermissions, setSavingPermissions] = useState(false);

    const openCreateRole = () => {
        createForm.resetFields();
        setCreatePermissionIds([]);
        setCreateVisible(true);
    };

    const createRole = async (values: CreateRoleFormValues) => {
        setCreatingRole(true);
        try {
            await roleApi.createRole({
                ...values,
                permissionIds: createPermissionIds,
            });
            Message.success("角色创建成功");
            setCreateVisible(false);
            await reload();
        } finally {
            setCreatingRole(false);
        }
    };

    const openAssignPermissions = (role: Role) => {
        setSelectedRole(role);
        setSelectedPermissionIds(role.permissions.map((permission) => permission.id));
        setAssignmentVisible(true);
    };

    const saveRolePermissions = async () => {
        if (!selectedRole) {
            return;
        }
        setSavingPermissions(true);
        try {
            await roleApi.updateRolePermissions(selectedRole.id, selectedPermissionIds);
            Message.success("角色权限已更新");
            setAssignmentVisible(false);
            await reload();
        } finally {
            setSavingPermissions(false);
        }
    };

    return (
        <div className="page-stack">
        <Panel
            title="角色管理"
            extra={
                <Button type="primary" icon={<IconPlus />} onClick={openCreateRole}>
                    新增角色
                </Button>
            }
            noPadding
        >
            <Table
                rowKey="id"
                loading={loading}
                data={data.list}
                pagination={{
                    current: data.pagination.page,
                    total: data.pagination.total,
                    pageSize: data.pagination.pageSize,
                    sizeCanChange: true,
                    showTotal: true,
                    onChange: changePage,
                }}
                columns={[
                    { title: "ID", dataIndex: "id", width: 80 },
                    { title: "编码", dataIndex: "code" },
                    { title: "名称", dataIndex: "name" },
                    {
                        title: "权限列表",
                        render: (_, record: Role) => (
                            <Space wrap>
                                {record.permissions.map((item) => (
                                    <Tag key={item.id}>{item.name}</Tag>
                                ))}
                            </Space>
                        ),
                    },
                    {
                        title: "操作",
                        width: 140,
                        render: (_, record: Role) => (
                            <Button size="small" onClick={() => openAssignPermissions(record)}>
                                分配权限
                            </Button>
                        ),
                    },
                ]}
            />
            <Modal title="新增角色" visible={createVisible} onCancel={() => setCreateVisible(false)} footer={null} style={{ width: "40rem" }}>
                <Form form={createForm} layout="vertical" onSubmit={createRole}>
                    <Form.Item label="角色编码" field="code" rules={[{ required: true }]}>
                        <Input placeholder="请输入角色编码，例如 drama_operator" />
                    </Form.Item>
                    <div className="form-help">角色的唯一标识，创建后不可修改</div>
                    <Form.Item label="角色名称" field="name" rules={[{ required: true }]}>
                        <Input placeholder="请输入角色名称" />
                    </Form.Item>
                    <Form.Item label="角色描述" field="description">
                        <Input.TextArea placeholder="请输入角色描述" autoSize={{ minRows: 2, maxRows: 4 }} />
                    </Form.Item>
                    <div className="form-label">权限设置</div>
                    <PermissionTreePicker permissions={permissions.data.list} value={createPermissionIds} onChange={setCreatePermissionIds} />
                    <div className="form-help">为角色分配系统权限，决定拥有此角色的用户可以进行的操作</div>
                    <div className="modal-actions">
                        <Button onClick={() => setCreateVisible(false)}>取消</Button>
                        <Button type="primary" htmlType="submit" loading={creatingRole}>
                            创建
                        </Button>
                    </div>
                </Form>
            </Modal>
            <Modal
                title={`分配权限${selectedRole ? ` - ${selectedRole.name}` : ""}`}
                visible={assignmentVisible}
                confirmLoading={savingPermissions}
                onOk={saveRolePermissions}
                onCancel={() => setAssignmentVisible(false)}
                style={{ width: "40rem" }}
            >
                <PermissionTreePicker permissions={permissions.data.list} value={selectedPermissionIds} onChange={setSelectedPermissionIds} />
            </Modal>
        </Panel>
        </div>
    );
}

export default RolesPage;