'use client';

import { useState, useEffect } from 'react';
import {
  Box,
  Typography,
  Button,
  Card,
  CardContent,
  TextField,
  Select,
  MenuItem,
  FormControl,
  InputLabel,
  Dialog,
  DialogTitle,
  DialogContent,
  DialogActions,
  Chip,
  IconButton,
  Breadcrumbs,
  Link,
  Alert
} from '@mui/material';
import {
  Add as AddIcon,
  Edit as EditIcon,
  Delete as DeleteIcon,
  Visibility as ViewIcon,
  Home as HomeIcon,
  ArticleOutlined as PagesIcon,
  Public as PublicIcon,
  Navigation as NavigationIcon,
  Foundation as FooterIcon
} from '@mui/icons-material';
import { DataGrid, GridColDef, GridActionsCellItem } from '@mui/x-data-grid';
import { PageEditor } from '@/components/admin/pages/page-editor';

interface Page {
  id: string;
  title: string;
  slug: string;
  status: 'DRAFT' | 'PUBLISHED' | 'ARCHIVED';
  showInNavigation: boolean;
  showInFooter: boolean;
  createdAt: string;
  updatedAt: string;
  creator: { name: string; email: string };
  updater: { name: string; email: string };
}

export default function PagesManagement() {
  const [pages, setPages] = useState<Page[]>([]);
  const [loading, setLoading] = useState(true);
  const [selectedPage, setSelectedPage] = useState<Page | null>(null);
  const [editorOpen, setEditorOpen] = useState(false);
  const [deleteDialogOpen, setDeleteDialogOpen] = useState(false);
  const [pageToDelete, setPageToDelete] = useState<Page | null>(null);
  const [filterStatus, setFilterStatus] = useState('all');
  const [searchQuery, setSearchQuery] = useState('');
  const [error, setError] = useState<string | null>(null);
  const [success, setSuccess] = useState<string | null>(null);

  useEffect(() => {
    fetchPages();
  }, [filterStatus, searchQuery]);

  const fetchPages = async () => {
    try {
      const token = localStorage.getItem('authToken');
      const params = new URLSearchParams();
      if (filterStatus !== 'all') params.append('status', filterStatus);
      if (searchQuery) params.append('search', searchQuery);

      const response = await fetch(`/api/admin/pages?${params.toString()}`, {
        headers: {
          'Authorization': `Bearer ${token}`
        }
      });

      if (!response.ok) {
        throw new Error('Failed to fetch pages');
      }

      const data = await response.json();
      setPages(data.data || []);
    } catch (error) {
      console.error('Error fetching pages:', error);
      setError('Failed to load pages');
    } finally {
      setLoading(false);
    }
  };

  const handleCreatePage = () => {
    setSelectedPage(null);
    setEditorOpen(true);
  };

  const handleEditPage = (page: Page) => {
    setSelectedPage(page);
    setEditorOpen(true);
  };

  const handleDeletePage = async (page: Page) => {
    setPageToDelete(page);
    setDeleteDialogOpen(true);
  };

  const confirmDeletePage = async () => {
    if (!pageToDelete) return;

    try {
      const token = localStorage.getItem('authToken');
      const response = await fetch(`/api/admin/pages/${pageToDelete.id}`, {
        method: 'DELETE',
        headers: {
          'Authorization': `Bearer ${token}`
        }
      });

      if (!response.ok) {
        throw new Error('Failed to delete page');
      }

      setSuccess('Page deleted successfully');
      fetchPages();
      setDeleteDialogOpen(false);
      setPageToDelete(null);
    } catch (error) {
      console.error('Error deleting page:', error);
      setError('Failed to delete page');
    }
  };

  const handlePageSaved = () => {
    setSuccess('Page saved successfully');
    setEditorOpen(false);
    fetchPages();
  };

  const getStatusColor = (status: string) => {
    switch (status) {
      case 'PUBLISHED': return 'success';
      case 'DRAFT': return 'warning';
      case 'ARCHIVED': return 'default';
      default: return 'default';
    }
  };

  const columns: GridColDef[] = [
    {
      field: 'title',
      headerName: 'Title',
      width: 300,
      renderCell: (params) => (
        <Box>
          <Typography variant="body2" fontWeight="medium">
            {params.value}
          </Typography>
          <Typography variant="caption" color="text.secondary">
            /{params.row.slug}
          </Typography>
        </Box>
      )
    },
    {
      field: 'status',
      headerName: 'Status',
      width: 120,
      renderCell: (params) => (
        <Chip
          label={params.value}
          color={getStatusColor(params.value) as any}
          size="small"
        />
      )
    },
    {
      field: 'showInNavigation',
      headerName: 'Navigation',
      width: 100,
      renderCell: (params) => (
        params.value ? <NavigationIcon color="primary" /> : null
      )
    },
    {
      field: 'showInFooter',
      headerName: 'Footer',
      width: 80,
      renderCell: (params) => (
        params.value ? <FooterIcon color="primary" /> : null
      )
    },
    {
      field: 'creator',
      headerName: 'Created By',
      width: 150,
      renderCell: (params) => params.value?.name || params.value?.email
    },
    {
      field: 'updatedAt',
      headerName: 'Last Updated',
      width: 150,
      renderCell: (params) => new Date(params.value).toLocaleDateString()
    },
    {
      field: 'actions',
      type: 'actions',
      headerName: 'Actions',
      width: 120,
      getActions: (params) => [
        <GridActionsCellItem
          key="edit"
          icon={<EditIcon />}
          label="Edit"
          onClick={() => handleEditPage(params.row)}
        />,
        <GridActionsCellItem
          key="view"
          icon={<ViewIcon />}
          label="View"
          onClick={() => window.open(`/pages/${params.row.slug}`, '_blank')}
        />,
        <GridActionsCellItem
          key="delete"
          icon={<DeleteIcon />}
          label="Delete"
          onClick={() => handleDeletePage(params.row)}
        />
      ]
    }
  ];

  return (
    <Box>
      {/* Breadcrumbs */}
      <Breadcrumbs aria-label="breadcrumb" sx={{ mb: 3 }}>
        <Link
          underline="hover"
          sx={{ display: 'flex', alignItems: 'center' }}
          color="inherit"
          href="/admin"
        >
          <HomeIcon sx={{ mr: 0.5 }} fontSize="inherit" />
          Admin
        </Link>
        <Typography color="text.primary" sx={{ display: 'flex', alignItems: 'center' }}>
          <PagesIcon sx={{ mr: 0.5 }} fontSize="inherit" />
          Pages
        </Typography>
      </Breadcrumbs>

      {/* Header */}
      <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', mb: 3 }}>
        <Box>
          <Typography variant="h4" component="h1" gutterBottom>
            Page Management
          </Typography>
          <Typography variant="body1" color="text.secondary">
            Create and manage website pages for navigation and footer
          </Typography>
        </Box>
        <Button
          variant="contained"
          startIcon={<AddIcon />}
          onClick={handleCreatePage}
          sx={{ height: 'fit-content' }}
        >
          New Page
        </Button>
      </Box>

      {/* Alerts */}
      {error && (
        <Alert severity="error" onClose={() => setError(null)} sx={{ mb: 2 }}>
          {error}
        </Alert>
      )}
      {success && (
        <Alert severity="success" onClose={() => setSuccess(null)} sx={{ mb: 2 }}>
          {success}
        </Alert>
      )}

      {/* Filters */}
      <Card sx={{ mb: 3 }}>
        <CardContent>
          <Box sx={{ display: 'flex', gap: 2 }}>
            <TextField
              label="Search pages"
              variant="outlined"
              size="small"
              value={searchQuery}
              onChange={(e) => setSearchQuery(e.target.value)}
              sx={{ minWidth: 300 }}
            />
            <FormControl size="small" sx={{ minWidth: 150 }}>
              <InputLabel>Status</InputLabel>
              <Select
                value={filterStatus}
                label="Status"
                onChange={(e) => setFilterStatus(e.target.value)}
              >
                <MenuItem value="all">All Status</MenuItem>
                <MenuItem value="published">Published</MenuItem>
                <MenuItem value="draft">Draft</MenuItem>
                <MenuItem value="archived">Archived</MenuItem>
              </Select>
            </FormControl>
          </Box>
        </CardContent>
      </Card>

      {/* Pages Table */}
      <Card>
        <DataGrid
          rows={pages}
          columns={columns}
          loading={loading}
          autoHeight
          pageSize={25}
          disableSelectionOnClick
          sx={{
            '& .MuiDataGrid-cell': {
              borderBottom: '1px solid #f0f0f0'
            }
          }}
        />
      </Card>

      {/* Page Editor Dialog */}
      <PageEditor
        open={editorOpen}
        onClose={() => setEditorOpen(false)}
        page={selectedPage}
        onSave={handlePageSaved}
      />

      {/* Delete Confirmation Dialog */}
      <Dialog open={deleteDialogOpen} onClose={() => setDeleteDialogOpen(false)}>
        <DialogTitle>Delete Page</DialogTitle>
        <DialogContent>
          <Typography>
            Are you sure you want to delete "{pageToDelete?.title}"? This action cannot be undone.
          </Typography>
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setDeleteDialogOpen(false)}>Cancel</Button>
          <Button onClick={confirmDeletePage} color="error" variant="contained">
            Delete
          </Button>
        </DialogActions>
      </Dialog>
    </Box>
  );
}