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import ClassCards from "@/app/student-page/components/class-list/ClassCards";
import SearchField from "@/app/student-page/components/class-list/SearchField";
import ButtonNewClass from "@/app/student-page/components/class-list/ButtonNewClass";
import { Alert, AlertTitle, Box, Card, CardActions, CardContent, Skeleton, Stack, Typography } from "@mui/material";
import AppBar from "@mui/material/AppBar";
import Toolbar from "@mui/material/Toolbar";
import SchoolIcon from "@mui/icons-material/SchoolOutlined";
import BreadcrumbsComponent from "@/utils/components/breadcrumbs/dynamic-breadcrumbs/Breadcrumbs";
import { FormControl, MenuItem, Select } from "@mui/material";
import { useDispatch, useSelector } from "react-redux";
import { _fetchAllClasses } from "@/store/slices/student/StudentClasses";
import getCurrentSemesterYear from "@/utils/helpers/getCurrentSemesterYear";
import CombinedPagination from "@/utils/components/pagination/CombinedPagination";
import { filterStudentClasses } from "./filterStudentClasses";
// The semester/status/search filters must run over the student's FULL class
// list, not just whatever page the server happens to return — so fetch a
// single, generously-sized page up front and do filtering + pagination
// client-side (mirrors the teacher class-list pattern).
const ALL_CLASSES_PAGE_SIZE = 1000;
// Placeholder card mirroring ClassCards' banner + title + code + button shape
// (see @/app/student-page/components/class-list/ClassCards.jsx) so the
// skeleton doesn't jump/reflow once the real cards render.
function ClassCardSkeleton() {
return (
<Card
elevation={0}
sx={{ borderRadius: "12px", overflow: "hidden", border: (t) => `1px solid ${t.palette.divider}` }}
>
<Skeleton variant="rectangular" height={120} animation="wave" />
<CardContent sx={{ pt: 2, pb: 1 }}>
<Skeleton variant="text" width="70%" height={28} animation="wave" />
<Skeleton variant="text" width="45%" height={20} animation="wave" sx={{ mb: 1.5 }} />
<Skeleton variant="rounded" width={92} height={22} animation="wave" />
</CardContent>
<CardActions sx={{ px: 2.5, pb: 2.5, pt: 0 }}>
<Skeleton variant="rounded" width="100%" height={32} animation="wave" />
</CardActions>
</Card>
);
}
function ClassListSkeleton() {
return (
<Box sx={{ minHeight: "80vh" }}>
<Stack direction={{ xs: "column", sm: "row" }} flexWrap="wrap" gap={2} sx={{ mb: 3 }}>
<Skeleton variant="rounded" width={200} height={40} animation="wave" />
<Skeleton variant="rounded" width={180} height={40} animation="wave" />
<Skeleton variant="rounded" width={160} height={40} animation="wave" />
<Skeleton
variant="rounded"
animation="wave"
sx={{ flex: 1, minWidth: 200, maxWidth: 320 }}
height={40}
/>
</Stack>
<Box
sx={{
display: "grid",
gridTemplateColumns: "repeat(auto-fill, minmax(268px, 1fr))",
gap: { xs: 1.5, sm: 2, md: 2.5 },
}}
>
{Array.from({ length: 6 }).map((_, i) => (
<ClassCardSkeleton key={i} />
))}
</Box>
</Box>
);
}
const Main = () => {
const { classData, hasErrors, isLoading } = useSelector((state) => state.StudentClasses);
const { studentData } = useSelector((state) => state.StudentData);
const { currentYear, currentSemester } = getCurrentSemesterYear();
const dispatch = useDispatch();
const [search, setSearch] = useState("");
const [selectedSemester, setSelectedSemester] = useState("All");
const [selectedStatus, setSelectedStatus] = useState("Enrolled");
const [isPage, setPage] = useState(0);
const [rowsPerPage, setRowsPerPage] = useState(10);
const tablePageChange = (_, newPage) => setPage(newPage);
const pageChange = (_, newPage) => setPage(newPage - 1);
const tableRowsPageChange = (event) => {
setRowsPerPage(parseInt(event.target.value, 10));
setPage(0);
};
useEffect(() => {
dispatch(_fetchAllClasses(`?page_num=1&page_size=${ALL_CLASSES_PAGE_SIZE}`));
}, [dispatch]);
// Reset to the first page whenever a filter changes so the user is never
// stranded on a now-empty page from a previous, wider result set.
useEffect(() => {
setPage(0);
}, [search, selectedSemester, selectedStatus]);
const filteredList = useMemo(
() =>
filterStudentClasses(classData, {
search,
selectedSemester,
selectedStatus,
studentEmail: studentData?.email,
}),
[classData, search, selectedSemester, selectedStatus, studentData?.email]
);
const totalPages = Math.max(1, Math.ceil(filteredList.length / rowsPerPage));
const currentPage = Math.min(isPage, totalPages - 1);
const pagedList = useMemo(
() => filteredList.slice(currentPage * rowsPerPage, currentPage * rowsPerPage + rowsPerPage),
[filteredList, currentPage, rowsPerPage]
);
return (
<Box>
<AppBar position="relative" color="primary">
<Toolbar>
<Typography variant="h6">{`${currentYear}-${currentSemester}`}</Typography>
</Toolbar>
</AppBar>
<BreadcrumbsComponent />
{hasErrors && (
<Alert sx={{ borderRadius: 0 }} severity="error">
<AlertTitle>Error</AlertTitle>
{hasErrors}
</Alert>
)}
<Box sx={{ p: { xs: 2, sm: 3 } }}>
{isLoading ? (
<ClassListSkeleton />
) : (
classData &&
(classData.length === 0 ? (
<Box
sx={{
minHeight: "70vh",
display: "flex",
flexDirection: "column",
alignItems: "center",
justifyContent: "center",
gap: 2,
}}
>
<SchoolIcon sx={{ fontSize: 80, color: "text.disabled" }} />
<Typography variant="h6" color="text.secondary">
You haven't joined any classes yet
</Typography>
<Typography variant="body2" color="text.disabled" textAlign="center">
Enroll in a class using a class code from your teacher
</Typography>
<Box sx={{ width: 220, mt: 1 }}>
<ButtonNewClass />
</Box>
</Box>
) : (
<Box
sx={{
minHeight: "80vh",
display: "flex",
flexDirection: "column",
justifyContent: "space-between",
}}
>
<Stack
direction={{ xs: "column", sm: "row" }}
alignItems={{ xs: "stretch", sm: "center" }}
flexWrap="wrap"
gap={2}
sx={{ mb: 3 }}
>
<Box sx={{ minWidth: 200 }}>
<ButtonNewClass />
</Box>
<FormControl sx={{ minWidth: 180 }}>
<Select
value={selectedSemester}
onChange={(e) => setSelectedSemester(e.target.value)}
size="small"
>
<MenuItem value="All">All Semesters</MenuItem>
<MenuItem value="Fall">Fall</MenuItem>
<MenuItem value="Summer 1">Summer 1</MenuItem>
<MenuItem value="Summer 2">Summer 2</MenuItem>
<MenuItem value="Spring">Spring</MenuItem>
</Select>
</FormControl>
<FormControl sx={{ minWidth: 160 }}>
<Select
value={selectedStatus}
onChange={(e) => setSelectedStatus(e.target.value)}
size="small"
>
<MenuItem value="All">All Classes</MenuItem>
<MenuItem value="Enrolled">Enrolled</MenuItem>
<MenuItem value="Pending">Pending</MenuItem>
<MenuItem value="Removed">Removed</MenuItem>
<MenuItem value="Rejected">Rejected</MenuItem>
<MenuItem value="Deleted">Deleted</MenuItem>
</Select>
</FormControl>
<Box sx={{ flex: 1, minWidth: 200, maxWidth: { sm: 320 } }}>
<SearchField search={search} setSearch={setSearch} />
</Box>
</Stack>
<Box sx={{ mt: 4, mb: 4 }}>
<ClassCards classList={pagedList} />
</Box>
<CombinedPagination
pagination={{ overAllEntries: filteredList.length }}
basicPage={{
isPage: currentPage,
rowsPerPage,
pageChange,
}}
tablePage={{
isPage: currentPage,
rowsPerPage,
tablePageChange,
tableRowsPageChange,
}}
/>
</Box>
))
)}
</Box>
</Box>
);
};
export default Main;
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