/**
 * @ai-summary Admin desktop page for managing community station submissions
 */

import React, { useState, useCallback } from 'react';
import {
  Box,
  Paper,
  Tabs,
  Tab,
  Select,
  MenuItem,
  FormControl,
  InputLabel,
  useMediaQuery,
  useTheme,
  Grid,
  Typography,
} from '@mui/material';
import { AdminSectionHeader } from '../components/AdminSectionHeader';
import { CommunityStationReviewQueue } from '../components/CommunityStationReviewQueue';
import { CommunityStationsList } from '../../stations/components/CommunityStationsList';
import {
  usePendingSubmissions,
  useAllCommunitySubmissions,
  useReviewStation,
} from '../../stations/hooks/useCommunityStations';
import toast from 'react-hot-toast';

interface TabPanelProps {
  children?: React.ReactNode;
  index: number;
  value: number;
}

const TabPanel: React.FC<TabPanelProps> = ({ children, value, index }) => {
  if (value !== index) {
    return null;
  }

  return (
    <div role="tabpanel">
      <Box sx={{ padding: 2 }}>{children}</Box>
    </div>
  );
};

/**
 * Admin page for reviewing and managing community station submissions
 * Desktop layout with tab navigation and status filtering
 */
export const AdminCommunityStationsPage: React.FC = () => {
  const theme = useTheme();
  const isMobile = useMediaQuery(theme.breakpoints.down('md'));

  const [tabValue, setTabValue] = useState(0);
  const [statusFilter, setStatusFilter] = useState<string>('');
  const [page, setPage] = useState(0);

  // Hooks
  const pendingSubmissions = usePendingSubmissions(page, 50);
  const allSubmissions = useAllCommunitySubmissions(statusFilter || undefined, page, 50);
  const reviewMutation = useReviewStation();

  // Determine which data to display
  const displayData = tabValue === 0 ? pendingSubmissions : allSubmissions;
  const stations = displayData.data?.stations || [];
  const totalPages = displayData.data?.total
    ? Math.ceil(displayData.data.total / 50)
    : 1;

  // Handle approval
  const handleApprove = useCallback(
    async (id: string) => {
      try {
        await reviewMutation.mutateAsync({
          id,
          decision: { status: 'approved' },
        });
        toast.success('Station approved');
      } catch (error: any) {
        toast.error(error?.response?.data?.message || 'Failed to approve station');
      }
    },
    [reviewMutation]
  );

  // Handle rejection
  const handleReject = useCallback(
    async (id: string, reason: string) => {
      try {
        await reviewMutation.mutateAsync({
          id,
          decision: { status: 'rejected', rejectionReason: reason },
        });
        toast.success('Station rejected');
      } catch (error: any) {
        toast.error(error?.response?.data?.message || 'Failed to reject station');
      }
    },
    [reviewMutation]
  );

  return (
    <Box>
      {/* Header */}
      <AdminSectionHeader
        title="Community Gas Station Reviews"
        stats={[
          { label: 'Pending', value: pendingSubmissions.data?.total || 0 },
          { label: 'Total', value: allSubmissions.data?.total || 0 }
        ]}
      />

      {/* Main content */}
      <Paper sx={{ m: 2 }}>
        <Tabs
          value={tabValue}
          onChange={(_, newValue) => setTabValue(newValue)}
          indicatorColor="primary"
          textColor="primary"
          aria-label="admin community stations tabs"
          variant={isMobile ? 'scrollable' : 'standard'}
        >
          <Tab label={`Pending (${pendingSubmissions.data?.total || 0})`} id="tab-0" />
          <Tab label="All Submissions" id="tab-1" />
        </Tabs>

        {/* Pending tab */}
        <TabPanel value={tabValue} index={0}>
          <CommunityStationReviewQueue
            stations={stations}
            loading={displayData.isLoading}
            error={displayData.error ? 'Failed to load submissions' : null}
            onApprove={handleApprove}
            onReject={handleReject}
            page={page}
            onPageChange={setPage}
            totalPages={totalPages}
            isReviewLoading={reviewMutation.isPending}
          />
        </TabPanel>

        {/* All submissions tab */}
        <TabPanel value={tabValue} index={1}>
          <Grid container spacing={2} sx={{ mb: 2 }}>
            <Grid item xs={12} sm={6} md={3}>
              <FormControl fullWidth size="small">
                <InputLabel>Filter by Status</InputLabel>
                <Select
                  value={statusFilter}
                  label="Filter by Status"
                  onChange={(e) => {
                    setStatusFilter(e.target.value);
                    setPage(0);
                  }}
                >
                  <MenuItem value="">All</MenuItem>
                  <MenuItem value="pending">Pending</MenuItem>
                  <MenuItem value="approved">Approved</MenuItem>
                  <MenuItem value="rejected">Rejected</MenuItem>
                </Select>
              </FormControl>
            </Grid>
          </Grid>

          <CommunityStationsList
            stations={stations}
            loading={displayData.isLoading}
            error={displayData.error ? 'Failed to load submissions' : null}
            isAdmin={true}
            onApprove={handleApprove}
            onReject={handleReject}
            page={page}
            onPageChange={setPage}
            totalPages={totalPages}
          />
        </TabPanel>
      </Paper>

      {/* Stats card */}
      {pendingSubmissions.data && (
        <Paper sx={{ m: 2, p: 2 }}>
          <Grid container spacing={2}>
            <Grid item xs={12} sm={6} md={3}>
              <Box>
                <Typography variant="h4" color="primary">
                  {pendingSubmissions.data.total}
                </Typography>
                <Typography variant="body2" color="textSecondary">
                  Pending Review
                </Typography>
              </Box>
            </Grid>
            {allSubmissions.data && (
              <>
                <Grid item xs={12} sm={6} md={3}>
                  <Box>
                    <Typography variant="h4" color="success.main">
                      {allSubmissions.data.stations.filter((s) => s.status === 'approved').length}
                    </Typography>
                    <Typography variant="body2" color="textSecondary">
                      Approved
                    </Typography>
                  </Box>
                </Grid>
                <Grid item xs={12} sm={6} md={3}>
                  <Box>
                    <Typography variant="h4" color="error.main">
                      {allSubmissions.data.stations.filter((s) => s.status === 'rejected').length}
                    </Typography>
                    <Typography variant="body2" color="textSecondary">
                      Rejected
                    </Typography>
                  </Box>
                </Grid>
                <Grid item xs={12} sm={6} md={3}>
                  <Box>
                    <Typography variant="h4">
                      {allSubmissions.data.total}
                    </Typography>
                    <Typography variant="body2" color="textSecondary">
                      Total Submitted
                    </Typography>
                  </Box>
                </Grid>
              </>
            )}
          </Grid>
        </Paper>
      )}
    </Box>
  );
};

export default AdminCommunityStationsPage;