/**
 * AppNav — top navigation bar (phone) / left sidebar (tablet/desktop).
 *
 * UI-SPEC §AppNav:
 *   - Phone: 48px top bar, app name "FamilySync" left, user color swatch right
 *   - Tablet/Desktop: 240px left sidebar, app name + ColorLegend
 *   - Accent colors NOT on chrome (60/30/10 split)
 *
 * Reviewer note (UI-SPEC §Post-Verification):
 *   - Phone-nav avatar/color swatch needs aria-label + title (icon-only affordance)
 *   - Grid is primary focal point; AppNav is secondary chrome
 */

import { NavLink } from 'react-router';
import { CalendarDays, List, ShieldCheck } from 'lucide-react';
import { ColorLegend, type LegendMember } from './ColorLegend.js';

interface AppNavProps {
  members?: LegendMember[];
  currentUserColor?: string;
  currentUserName?: string;
  /** Called when the user avatar is tapped — opens the Settings sheet. */
  onOpenSettings?: () => void;
  /** When true, renders the Admin nav entry (ShieldCheck). UX gating only (D-03). */
  isAdmin?: boolean;
}

export function AppNav({
  members = [],
  currentUserColor,
  currentUserName,
  onOpenSettings,
  isAdmin = false,
}: AppNavProps) {
  const isMobile = typeof window !== 'undefined' && window.matchMedia('(max-width: 767px)').matches;

  if (isMobile) {
    return (
      <PhoneNav
        currentUserColor={currentUserColor}
        currentUserName={currentUserName}
        onOpenSettings={onOpenSettings}
      />
    );
  }

  return (
    <DesktopNav
      members={members}
      currentUserColor={currentUserColor}
      currentUserName={currentUserName}
      onOpenSettings={onOpenSettings}
      isAdmin={isAdmin}
    />
  );
}

/** Phone: 48px top bar — app name left, user avatar right */
function PhoneNav({
  currentUserColor,
  currentUserName,
  onOpenSettings,
}: {
  currentUserColor?: string;
  currentUserName?: string;
  onOpenSettings?: () => void;
}) {
  const displayName = currentUserName ?? 'User';
  const color = currentUserColor ?? 'var(--color-member-0)';

  return (
    <header
      style={{
        height: '48px',
        display: 'flex',
        alignItems: 'center',
        justifyContent: 'space-between',
        padding: '0 var(--space-4)',
        background: 'var(--color-surface)',
        borderBottom: '1px solid var(--color-border)',
        flexShrink: 0,
        fontFamily: 'var(--font-family-base)',
      }}
    >
      {/* App name */}
      <span
        style={{
          fontSize: 'var(--text-display-size)',
          fontWeight: 'var(--text-display-weight)',
          lineHeight: 'var(--text-display-line-height)',
          color: 'var(--color-text-primary)',
          letterSpacing: '-0.01em',
        }}
      >
        FamilySync
      </span>

      {/* User avatar — promoted to button to open Settings sheet (D-09) */}
      <button
        onClick={onOpenSettings}
        aria-label={`${displayName} — open settings`}
        style={{
          background: 'none',
          border: 'none',
          cursor: onOpenSettings ? 'pointer' : 'default',
          minWidth: '44px',
          minHeight: '44px',
          display: 'flex',
          alignItems: 'center',
          justifyContent: 'center',
          padding: 0,
          borderRadius: 'var(--space-1, 4px)',
          flexShrink: 0,
        }}
      >
        <div
          style={{
            width: '32px',
            height: '32px',
            borderRadius: '50%',
            background: color,
          }}
          aria-hidden="true"
        />
      </button>
    </header>
  );
}

/** Tablet/Desktop: 240px left sidebar — app name + nav links + color legend + avatar */
function DesktopNav({
  members,
  currentUserColor,
  currentUserName,
  onOpenSettings,
  isAdmin = false,
}: {
  members: LegendMember[];
  currentUserColor?: string;
  currentUserName?: string;
  onOpenSettings?: () => void;
  isAdmin?: boolean;
}) {
  const navLinkStyle = ({ isActive }: { isActive: boolean }): React.CSSProperties => ({
    display: 'flex',
    alignItems: 'center',
    gap: '10px',
    padding: 'var(--space-2) var(--space-3, 12px)',
    borderRadius: 'var(--space-1, 4px)',
    textDecoration: 'none',
    fontSize: 'var(--text-body-size, 15px)',
    fontWeight: isActive ? 600 : 400,
    color: isActive ? 'var(--color-member-0)' : 'var(--color-text-primary)',
    background: isActive
      ? 'color-mix(in srgb, var(--color-member-0) 10%, transparent)'
      : 'transparent',
    minHeight: '44px',
    transition: 'color 0.1s ease, background 0.1s ease',
  });

  return (
    <nav
      style={{
        width: '240px',
        flexShrink: 0,
        background: 'var(--color-surface)',
        borderRight: '1px solid var(--color-border)',
        display: 'flex',
        flexDirection: 'column',
        padding: 'var(--space-6) var(--space-4)',
        fontFamily: 'var(--font-family-base)',
        overflowY: 'auto',
      }}
      aria-label="Main navigation"
    >
      {/* App name */}
      <div
        style={{
          fontSize: 'var(--text-display-size)',
          fontWeight: 'var(--text-display-weight)',
          lineHeight: 'var(--text-display-line-height)',
          color: 'var(--color-text-primary)',
          marginBottom: 'var(--space-6)',
          letterSpacing: '-0.01em',
        }}
      >
        FamilySync
      </div>

      {/* Section nav links */}
      <div
        style={{
          display: 'flex',
          flexDirection: 'column',
          gap: 'var(--space-1, 4px)',
          marginBottom: 'var(--space-6)',
        }}
      >
        <NavLink to="/calendar" style={navLinkStyle} aria-label="Calendar">
          <CalendarDays size={18} aria-hidden="true" />
          Calendar
        </NavLink>
        <NavLink to="/lists" style={navLinkStyle} aria-label="Lists">
          <List size={18} aria-hidden="true" />
          Lists
        </NavLink>
        {/* Admin entry — only when isAdmin=true (UX gating, D-03) */}
        {isAdmin && (
          <NavLink to="/admin" style={navLinkStyle} aria-label="Admin settings">
            <ShieldCheck size={18} aria-hidden="true" />
            Admin
          </NavLink>
        )}
      </div>

      {/* Color legend */}
      <div
        style={{
          fontSize: 'var(--text-label-size)',
          fontWeight: 600,
          color: 'var(--color-text-muted)',
          marginBottom: 'var(--space-2)',
          textTransform: 'uppercase',
          letterSpacing: '0.06em',
        }}
      >
        Calendars
      </div>
      <ColorLegend members={members} />

      {/* User avatar — at bottom of sidebar, opens Settings sheet (D-09) */}
      <div style={{ marginTop: 'auto', paddingTop: 'var(--space-6)' }}>
        <button
          onClick={onOpenSettings}
          aria-label={`${currentUserName ?? 'User'} — open settings`}
          style={{
            background: 'none',
            border: 'none',
            cursor: onOpenSettings ? 'pointer' : 'default',
            minWidth: '44px',
            minHeight: '44px',
            display: 'flex',
            alignItems: 'center',
            gap: 'var(--space-3, 12px)',
            padding: 'var(--space-2) var(--space-3, 12px)',
            borderRadius: 'var(--space-1, 4px)',
            width: '100%',
            textAlign: 'left',
          }}
        >
          <div
            style={{
              width: '32px',
              height: '32px',
              borderRadius: '50%',
              background: currentUserColor ?? 'var(--color-member-0)',
              flexShrink: 0,
            }}
            aria-hidden="true"
          />
          <span
            style={{
              fontSize: 'var(--text-body-size, 15px)',
              color: 'var(--color-text-primary)',
              overflow: 'hidden',
              textOverflow: 'ellipsis',
              whiteSpace: 'nowrap',
            }}
          >
            {currentUserName ?? 'User'}
          </span>
        </button>
      </div>
    </nav>
  );
}