import React from 'react';
import Box from '@mui/material/Box';
import Container from '@mui/material/Container';
import Grid from '@mui/material/Grid';
import type { SxProps, Theme } from '@mui/material/styles';
import { Typography } from '../../atoms/Typography';
import { Link } from '../../atoms/Link';
import { Divider } from '../../atoms/Divider';

// ─── Types ───────────────────────────────────────────────────────────────────

/** A group of links in the footer */
export interface FooterLinkGroup {
  /** Group heading */
  heading: string;
  /** Links within this group */
  links: { label: string; href: string; onClick?: () => void }[];
}

/** Props for the FA Footer organism */
export interface FooterProps {
  /** Site logo — rendered in the footer top row */
  logo: React.ReactNode;
  /** Optional tagline below the logo */
  tagline?: string;
  /** Link groups displayed as columns */
  linkGroups?: FooterLinkGroup[];
  /** Phone number displayed in the contact section */
  phone?: string;
  /** Email address displayed in the contact section */
  email?: string;
  /** Copyright text — defaults to current year + "Funeral Arranger" */
  copyright?: string;
  /** Optional legal links shown in the bottom bar (Privacy, Terms, etc.) */
  legalLinks?: { label: string; href: string; onClick?: () => void }[];
  /** MUI sx prop for the root element */
  sx?: SxProps<Theme>;
}

// ─── Component ───────────────────────────────────────────────────────────────

/**
 * Site footer for the FA design system.
 *
 * Multi-column footer with logo, link groups, contact info, and legal bar.
 * Designed for warmth and trust — uses the brand's dark surface with
 * inverse (white) text.
 *
 * Composes Typography + Link + Divider.
 *
 * Usage:
 * ```tsx
 * <Footer
 *   logo={<img src="/brandlogo/logo-full.svg" alt="Funeral Arranger" height={28} />}
 *   tagline="Helping Australian families plan with confidence"
 *   linkGroups={[
 *     { heading: 'Services', links: [{ label: 'Find a Director', href: '/directors' }] },
 *     { heading: 'Support', links: [{ label: 'FAQ', href: '/faq' }] },
 *   ]}
 *   phone="1800 987 888"
 *   email="support@funeralarranger.com.au"
 *   legalLinks={[{ label: 'Privacy Policy', href: '/privacy' }]}
 * />
 * ```
 */
export const Footer = React.forwardRef<HTMLDivElement, FooterProps>(
  ({ logo, tagline, linkGroups = [], phone, email, copyright, legalLinks = [], sx }, ref) => {
    const year = new Date().getFullYear();
    const copyrightText = copyright || `\u00A9 ${year} Funeral Arranger. All rights reserved.`;

    const overlineSx = {
      color: 'text.secondary',
      textTransform: 'uppercase' as const,
      letterSpacing: '0.08em',
      display: 'block',
      mb: 0.5,
    };

    const contactLinkSx = {
      color: 'text.primary',
      '&:hover': { color: 'var(--fa-color-brand-600)' },
    };

    return (
      <Box
        ref={ref}
        component="footer"
        sx={[
          {
            bgcolor: 'var(--fa-color-surface-subtle)',
            color: 'text.primary',
            pt: { xs: 5, md: 8 },
            pb: 0,
          },
          ...(Array.isArray(sx) ? sx : [sx]),
        ]}
      >
        <Container maxWidth="lg">
          {/* Main footer content */}
          <Grid container spacing={{ xs: 4, md: 6 }}>
            {/* Logo + tagline column */}
            <Grid size={{ xs: 12, md: 4 }}>
              <Box sx={{ mb: 2 }}>{logo}</Box>
              {tagline && (
                <Typography
                  variant="body2"
                  sx={{ color: 'text.secondary', maxWidth: { xs: '100%', md: 280 } }}
                >
                  {tagline}
                </Typography>
              )}

              {/* Contact info below tagline */}
              {(phone || email) && (
                <Box sx={{ mt: 3 }}>
                  {phone && (
                    <Box sx={{ mb: 1 }}>
                      <Typography variant="overlineSm" sx={overlineSx}>
                        Call us
                      </Typography>
                      <Link
                        href={`tel:${phone.replace(/\s/g, '')}`}
                        sx={{
                          ...contactLinkSx,
                          fontWeight: 600,
                          display: 'inline-flex',
                          alignItems: 'center',
                          minHeight: 44,
                        }}
                      >
                        {phone}
                      </Link>
                    </Box>
                  )}
                  {email && (
                    <Box>
                      <Typography variant="overlineSm" sx={overlineSx}>
                        Email
                      </Typography>
                      <Link
                        href={`mailto:${email}`}
                        sx={{
                          ...contactLinkSx,
                          display: 'inline-flex',
                          alignItems: 'center',
                          minHeight: 44,
                        }}
                      >
                        {email}
                      </Link>
                    </Box>
                  )}
                </Box>
              )}
            </Grid>

            {/* Link group columns */}
            {linkGroups.map((group) => (
              <Grid
                size={{ xs: 6, sm: 4, md: 'grow' }}
                key={group.heading}
                component="nav"
                aria-label={group.heading}
              >
                <Typography
                  variant="label"
                  sx={{
                    color: 'text.secondary',
                    mb: 2,
                    display: 'block',
                  }}
                >
                  {group.heading}
                </Typography>
                <Box
                  component="ul"
                  sx={{
                    listStyle: 'none',
                    p: 0,
                    m: 0,
                    display: 'flex',
                    flexDirection: 'column',
                    gap: 1.5,
                  }}
                >
                  {group.links.map((link) => (
                    <li key={link.label}>
                      <Link
                        href={link.href}
                        onClick={link.onClick}
                        sx={{
                          color: 'text.primary',
                          fontSize: '0.875rem',
                          fontWeight: 500,
                          display: 'inline-flex',
                          alignItems: 'center',
                          minHeight: 44,
                          '&:hover': { color: 'var(--fa-color-brand-600)' },
                        }}
                      >
                        {link.label}
                      </Link>
                    </li>
                  ))}
                </Box>
              </Grid>
            ))}
          </Grid>

          {/* Bottom bar */}
          <Divider sx={{ mt: { xs: 5, md: 8 } }} />

          <Box
            sx={{
              display: 'flex',
              flexDirection: { xs: 'column', md: 'row' },
              justifyContent: 'space-between',
              alignItems: { xs: 'center', md: 'center' },
              gap: 1.5,
              py: 3,
            }}
          >
            <Typography variant="captionSm" sx={{ color: 'text.secondary' }}>
              {copyrightText}
            </Typography>

            {legalLinks.length > 0 && (
              <Box
                sx={{
                  display: 'flex',
                  gap: 3,
                  flexWrap: 'wrap',
                  justifyContent: 'center',
                }}
              >
                {legalLinks.map((link) => (
                  <Link
                    key={link.label}
                    href={link.href}
                    onClick={link.onClick}
                    sx={{
                      color: 'text.secondary',
                      fontSize: '0.75rem',
                      fontWeight: 500,
                      display: 'inline-flex',
                      alignItems: 'center',
                      minHeight: 44,
                      '&:hover': { color: 'var(--fa-color-brand-600)' },
                    }}
                  >
                    {link.label}
                  </Link>
                ))}
              </Box>
            )}
          </Box>
        </Container>
      </Box>
    );
  },
);

Footer.displayName = 'Footer';
export default Footer;