'use client';

import { useState, useEffect } from 'react';
import {
  Box,
  Paper,
  Typography,
  Button,
  Chip,
  IconButton,
  Tooltip,
  TextField,
  Dialog,
  DialogTitle,
  DialogContent,
  DialogActions,
  Alert,
  CircularProgress,
  Accordion,
  AccordionSummary,
  AccordionDetails,
  Stack,
} from '@mui/material';
import {
  ContentCopy,
  Refresh,
  Delete,
  Email,
  ExpandMore,
  Info,
} from '@mui/icons-material';
import { familiesApi } from '@/lib/api/families';

interface RoleInvitesSectionProps {
  familyId: string;
  onSuccess?: (message: string) => void;
  onError?: (message: string) => void;
}

interface RoleCode {
  code: string;
  expiresAt: Date;
}

interface RoleCodes {
  parent?: RoleCode;
  caregiver?: RoleCode;
  viewer?: RoleCode;
}

const roleInfo = {
  parent: {
    icon: '👨‍👩‍👧',
    label: 'Parent',
    description: 'Full access - manage children, log activities, view reports, and invite others',
    color: 'primary' as const,
  },
  caregiver: {
    icon: '🤝',
    label: 'Caregiver',
    description: 'Can edit children, log activities, and view reports (cannot add children or invite others)',
    color: 'secondary' as const,
  },
  viewer: {
    icon: '👁️',
    label: 'Viewer',
    description: 'View-only access - can view reports but cannot log activities',
    color: 'info' as const,
  },
};

export function RoleInvitesSection({ familyId, onSuccess, onError }: RoleInvitesSectionProps) {
  const [roleCodes, setRoleCodes] = useState<RoleCodes>({});
  const [loading, setLoading] = useState(true);
  const [actionLoading, setActionLoading] = useState<string | null>(null);
  const [emailDialogOpen, setEmailDialogOpen] = useState(false);
  const [selectedRole, setSelectedRole] = useState<'parent' | 'caregiver' | 'viewer' | null>(null);
  const [recipientEmail, setRecipientEmail] = useState('');
  const [emailSending, setEmailSending] = useState(false);

  useEffect(() => {
    fetchRoleCodes();
  }, [familyId]);

  const fetchRoleCodes = async () => {
    try {
      setLoading(true);
      const codes = await familiesApi.getRoleInviteCodes(familyId);
      setRoleCodes(codes);
    } catch (err: any) {
      console.error('Failed to fetch role codes:', err);
      onError?.('Failed to load invite codes');
    } finally {
      setLoading(false);
    }
  };

  const handleGenerateCode = async (role: 'parent' | 'caregiver' | 'viewer') => {
    try {
      setActionLoading(role);
      const result = await familiesApi.generateRoleInviteCode(familyId, role, 7);
      setRoleCodes(prev => ({
        ...prev,
        [role]: { code: result.code, expiresAt: result.expiresAt },
      }));
      onSuccess?.(`${roleInfo[role].label} invite code generated`);
    } catch (err: any) {
      console.error('Failed to generate code:', err);
      onError?.('Failed to generate invite code');
    } finally {
      setActionLoading(null);
    }
  };

  const handleCopyCode = async (code: string, role: string) => {
    try {
      await navigator.clipboard.writeText(code);
      onSuccess?.(`${roleInfo[role as keyof typeof roleInfo].label} code copied to clipboard`);
    } catch (err) {
      onError?.('Failed to copy code');
    }
  };

  const handleRevokeCode = async (role: 'parent' | 'caregiver' | 'viewer') => {
    try {
      setActionLoading(role);
      await familiesApi.revokeRoleInviteCode(familyId, role);
      setRoleCodes(prev => {
        const updated = { ...prev };
        delete updated[role];
        return updated;
      });
      onSuccess?.(`${roleInfo[role].label} invite code revoked`);
    } catch (err: any) {
      console.error('Failed to revoke code:', err);
      onError?.('Failed to revoke invite code');
    } finally {
      setActionLoading(null);
    }
  };

  const handleOpenEmailDialog = (role: 'parent' | 'caregiver' | 'viewer') => {
    setSelectedRole(role);
    setRecipientEmail('');
    setEmailDialogOpen(true);
  };

  const handleSendEmailInvite = async () => {
    if (!selectedRole || !recipientEmail) return;

    try {
      setEmailSending(true);
      const result = await familiesApi.sendEmailInvite(familyId, recipientEmail, selectedRole);

      // Update the codes
      setRoleCodes(prev => ({
        ...prev,
        [selectedRole]: { code: result.code, expiresAt: result.expiresAt },
      }));

      if (result.emailSent) {
        onSuccess?.(`Invite email sent to ${recipientEmail}`);
      } else {
        onSuccess?.('Invite code generated, but email could not be sent');
      }

      setEmailDialogOpen(false);
      setRecipientEmail('');
      setSelectedRole(null);
    } catch (err: any) {
      console.error('Failed to send email invite:', err);
      onError?.(err.response?.data?.message || 'Failed to send email invite');
    } finally {
      setEmailSending(false);
    }
  };

  const formatExpiryDate = (expiresAt: Date) => {
    const date = new Date(expiresAt);
    const now = new Date();
    const diffMs = date.getTime() - now.getTime();
    const diffDays = Math.ceil(diffMs / (1000 * 60 * 60 * 24));

    if (diffDays < 0) return 'Expired';
    if (diffDays === 0) return 'Expires today';
    if (diffDays === 1) return 'Expires tomorrow';
    return `Expires in ${diffDays} days`;
  };

  const renderRoleCodeCard = (role: 'parent' | 'caregiver' | 'viewer') => {
    const info = roleInfo[role];
    const codeData = roleCodes[role];
    const isLoading = actionLoading === role;

    return (
      <Accordion key={role} sx={{ mb: 2, borderRadius: 2, '&:before': { display: 'none' } }}>
        <AccordionSummary
          expandIcon={<ExpandMore />}
          sx={{
            borderRadius: 2,
            '&.Mui-expanded': { borderBottomLeftRadius: 0, borderBottomRightRadius: 0 },
          }}
        >
          <Box sx={{ display: 'flex', alignItems: 'center', gap: 2, width: '100%' }}>
            <Typography sx={{ fontSize: '1.5rem' }}>{info.icon}</Typography>
            <Box sx={{ flex: 1 }}>
              <Typography variant="subtitle1" fontWeight="600">
                {info.label}
              </Typography>
              <Typography variant="caption" color="text.secondary">
                {codeData ? formatExpiryDate(codeData.expiresAt) : 'No active code'}
              </Typography>
            </Box>
            {codeData && (
              <Chip
                label={codeData.code}
                color={info.color}
                sx={{ fontWeight: 600, letterSpacing: 1 }}
              />
            )}
          </Box>
        </AccordionSummary>
        <AccordionDetails>
          <Box>
            <Typography variant="body2" color="text.secondary" sx={{ mb: 2 }}>
              {info.description}
            </Typography>

            {codeData ? (
              <Stack spacing={1}>
                <Box sx={{ display: 'flex', gap: 1 }}>
                  <Button
                    size="small"
                    variant="outlined"
                    startIcon={<ContentCopy />}
                    onClick={() => handleCopyCode(codeData.code, role)}
                    disabled={isLoading}
                    sx={{ textTransform: 'none', borderRadius: 2 }}
                  >
                    Copy Code
                  </Button>
                  <Button
                    size="small"
                    variant="outlined"
                    startIcon={<Email />}
                    onClick={() => handleOpenEmailDialog(role)}
                    disabled={isLoading}
                    sx={{ textTransform: 'none', borderRadius: 2 }}
                  >
                    Email Invite
                  </Button>
                  <Button
                    size="small"
                    variant="outlined"
                    startIcon={<Refresh />}
                    onClick={() => handleGenerateCode(role)}
                    disabled={isLoading}
                    sx={{ textTransform: 'none', borderRadius: 2 }}
                  >
                    Regenerate
                  </Button>
                  <IconButton
                    size="small"
                    color="error"
                    onClick={() => handleRevokeCode(role)}
                    disabled={isLoading}
                  >
                    <Delete fontSize="small" />
                  </IconButton>
                </Box>
              </Stack>
            ) : (
              <Button
                variant="contained"
                color={info.color}
                onClick={() => handleGenerateCode(role)}
                disabled={isLoading}
                startIcon={isLoading ? <CircularProgress size={16} /> : null}
                sx={{ textTransform: 'none', borderRadius: 2 }}
              >
                Generate {info.label} Invite Code
              </Button>
            )}
          </Box>
        </AccordionDetails>
      </Accordion>
    );
  };

  if (loading) {
    return (
      <Paper elevation={0} sx={{ p: 3, borderRadius: 3, bgcolor: 'background.paper' }}>
        <Box sx={{ display: 'flex', justifyContent: 'center', py: 4 }}>
          <CircularProgress />
        </Box>
      </Paper>
    );
  }

  return (
    <>
      <Paper elevation={0} sx={{ p: 3, borderRadius: 3, bgcolor: 'background.paper' }}>
        <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, mb: 2 }}>
          <Typography variant="h6" fontWeight="600">
            Role-Based Invites
          </Typography>
          <Tooltip title="Generate invite codes with specific roles and permissions">
            <IconButton size="small">
              <Info fontSize="small" />
            </IconButton>
          </Tooltip>
        </Box>

        <Alert severity="info" sx={{ mb: 3, borderRadius: 2 }}>
          Create role-specific invite codes that automatically assign permissions when used.
        </Alert>

        <Box>
          {renderRoleCodeCard('parent')}
          {renderRoleCodeCard('caregiver')}
          {renderRoleCodeCard('viewer')}
        </Box>
      </Paper>

      {/* Email Invite Dialog */}
      <Dialog
        open={emailDialogOpen}
        onClose={() => setEmailDialogOpen(false)}
        maxWidth="sm"
        fullWidth
      >
        <DialogTitle>
          Send {selectedRole && roleInfo[selectedRole].icon} {selectedRole && roleInfo[selectedRole].label} Invite via Email
        </DialogTitle>
        <DialogContent>
          <Typography variant="body2" color="text.secondary" sx={{ mb: 3 }}>
            Send an invitation email with the {selectedRole} invite code
          </Typography>
          <TextField
            fullWidth
            label="Recipient Email"
            type="email"
            value={recipientEmail}
            onChange={(e) => setRecipientEmail(e.target.value)}
            placeholder="name@example.com"
            autoFocus
            sx={{ mt: 1 }}
          />
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setEmailDialogOpen(false)} sx={{ textTransform: 'none' }}>
            Cancel
          </Button>
          <Button
            onClick={handleSendEmailInvite}
            variant="contained"
            disabled={!recipientEmail || emailSending}
            startIcon={emailSending ? <CircularProgress size={16} /> : <Email />}
            sx={{ textTransform: 'none' }}
          >
            Send Invite
          </Button>
        </DialogActions>
      </Dialog>
    </>
  );
}