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import {
Alert,
AlertTitle,
Box,
Card,
CardActions,
CardContent,
Chip,
FormControl,
MenuItem,
Select,
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 { useDispatch, useSelector } from "react-redux";
import { _fetchAllClasses } from "@/store/slices/teacher/TeacherClasses";
import getCurrentSemesterYear from "@/utils/helpers/getCurrentSemesterYear";
// EI-1187 — PR #119 (feat/responsive-design) moved this page from page/ to
// components/ but dropped the semester-header wiring PR #101 originally
// added; this import re-instates it so the AppBar header reflects the
// user's semester filter instead of always showing the current real-world
// semester.
import { classesHeaderLabel } from "@/app/teacher-page/page/class-list/classesHeaderLabel";
import { filterClassesBySearch } from "@/app/teacher-page/components/class-list/filterClassesBySearch";
import SearchField from "@/utils/components/SearchField";
import ClassCards from "@/app/teacher-page/components/class-list/ClassCards";
import ButtonNewClass from "@/app/teacher-page/components/class-list/NewClass";
// Placeholder card mirroring ClassCards' banner + title + code + button shape
// (see @/app/teacher-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={{ display: "flex", flexDirection: "column", gap: 3 }}>
<Stack direction={{ xs: "column", sm: "row" }} flexWrap="wrap" gap={1.5} sx={{ mb: 0 }}>
<Skeleton variant="rounded" width={200} height={40} animation="wave" />
<Skeleton variant="rounded" width={140} 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>
);
}
export default function ClassList() {
const { classData, hasErrors, isLoading } = useSelector((state) => state.TeacherClasses);
const { currentYear, currentSemester } = getCurrentSemesterYear();
const dispatch = useDispatch();
const [search, setSearch] = useState("");
const [selectedSemester, setSelectedSemester] = useState("All");
// The visible classes use the unit-tested `filterClassesBySearch` helper
// (semester + free-text search); the chip count and the rendered cards
// both derive from this one filtered list.
const filtered = useMemo(
() => (classData ? filterClassesBySearch(classData, search, selectedSemester) : []),
[classData, search, selectedSemester]
);
const filteredCount = filtered.length;
// Modified by Allan Ninal — pagination removed. The backend caps a teacher at ten
// classes (see NewClass.jsx, which disables Create at that cap), and the page size
// was ten, so a second page could never exist: the control, its page-size selector
// and the page state behind them were all unreachable in practice.
//
// That also retires a real bug rather than fixing it. Filtering used to leave the
// teacher on the LAST page of the new results instead of the first, because the
// page was only clamped into range. With one page there is no page to be wrong.
useEffect(() => {
dispatch(_fetchAllClasses(""));
}, [dispatch]);
return (
<Box
sx={{ minHeight: "100vh", bgcolor: (t) => (t.palette.mode === "dark" ? "background.default" : "#f8f9fc") }}
>
<AppBar position="relative" color="primary" elevation={0}>
<Toolbar>
<Typography variant="h6" fontWeight={700} id="teacher-classes-semester-and-year">
{classesHeaderLabel({ currentYear, currentSemester, selectedSemester })}
</Typography>
</Toolbar>
</AppBar>
<BreadcrumbsComponent />
{hasErrors && !isLoading && (
<Alert severity="error" sx={{ borderRadius: 0 }}>
<AlertTitle>Error</AlertTitle>
{hasErrors}
</Alert>
)}
<Box sx={{ p: { xs: 2, sm: 3, md: 4 } }}>
{isLoading ? (
<ClassListSkeleton />
) : classData && classData.length === 0 ? (
<Box
sx={{
minHeight: "65vh",
display: "flex",
flexDirection: "column",
alignItems: "center",
justifyContent: "center",
gap: 2,
}}
>
<SchoolIcon sx={{ fontSize: 80, color: "text.disabled" }} />
<Typography variant="h6" fontWeight={700} color="text.secondary">
No classes yet
</Typography>
<Typography variant="body2" color="text.disabled" textAlign="center">
Create your first class to get started
</Typography>
<Box sx={{ width: 220, mt: 1 }}>
<ButtonNewClass />
</Box>
</Box>
) : (
classData && (
<Box sx={{ display: "flex", flexDirection: "column", gap: 3 }}>
<Stack
className="teacher-class-list-header"
direction={{ xs: "column", sm: "row" }}
alignItems={{ xs: "stretch", sm: "center" }}
justifyContent="space-between"
gap={1.5}
>
<Stack
direction={{ xs: "column", sm: "row" }}
alignItems={{ xs: "stretch", sm: "center" }}
gap={1.5}
sx={{ flex: 1 }}
>
<Box sx={{ minWidth: { xs: "100%", sm: 200 } }}>
<ButtonNewClass />
</Box>
<FormControl>
<Select
id="teacher-classes-page-select-semester"
value={selectedSemester}
onChange={(e) => setSelectedSemester(e.target.value)}
displayEmpty
size="small"
>
<MenuItem id="teacher-classes-page-select-item-all" value="All">
All Semesters
</MenuItem>
<MenuItem id="teacher-classes-page-select-item-fall" value="Fall">
Fall
</MenuItem>
<MenuItem id="teacher-classes-page-select-item-summer1" value="Summer 1">
Summer 1
</MenuItem>
<MenuItem id="teacher-classes-page-select-item-summer2" value="Summer 2">
Summer 2
</MenuItem>
<MenuItem id="teacher-classes-page-select-item-spring" value="Spring">
Spring
</MenuItem>
</Select>
</FormControl>
<Box sx={{ flex: 1, minWidth: 200, maxWidth: { sm: 320 } }}>
<SearchField
search={search}
setSearch={setSearch}
placeHolder="Search classes by name, section, or code…"
/>
</Box>
</Stack>
<Chip
label={`${filteredCount} ${filteredCount === 1 ? "class" : "classes"}`}
sx={{
fontWeight: 700,
color: "primary.main",
bgcolor: (t) => `${t.palette.primary.main}12`,
border: (t) => `1px solid ${t.palette.primary.main}30`,
alignSelf: { xs: "flex-start", sm: "center" },
}}
/>
</Stack>
<Box sx={{ mt: 4, mb: 4 }}>
<ClassCards selectedSemester={selectedSemester} classList={filtered} search={search} />
</Box>
<Box sx={{ height: 24 }} />
</Box>
)
)}
</Box>
</Box>
);
}
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