import React from 'react';
import Box from '@mui/material/Box';
import LocationOnOutlinedIcon from '@mui/icons-material/LocationOnOutlined';
import StarRoundedIcon from '@mui/icons-material/StarRounded';
import VerifiedOutlinedIcon from '@mui/icons-material/VerifiedOutlined';
import type { SxProps, Theme } from '@mui/material/styles';
import { WizardLayout } from '../../templates/WizardLayout';
import { ProviderCardCompact } from '../../molecules/ProviderCardCompact';
import { ServiceOption } from '../../molecules/ServiceOption';
import { PackageDetail } from '../../organisms/PackageDetail';
import type { PackageSection } from '../../organisms/PackageDetail';
import { Typography } from '../../atoms/Typography';
import { Card } from '../../atoms/Card';
import { Divider } from '../../atoms/Divider';

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

/** Provider summary for the compact card */
export interface UnverifiedPackageT3Provider {
  /** Provider name */
  name: string;
  /** Location */
  location: string;
  /** Image URL */
  imageUrl?: string;
  /** Rating */
  rating?: number;
  /** Review count */
  reviewCount?: number;
}

/** Package data for the selection list */
export interface UnverifiedPackageT3Data {
  /** Unique package ID */
  id: string;
  /** Package display name */
  name: string;
  /** Package price in dollars */
  price: number;
  /** Short description */
  description?: string;
  /** Line item sections for the detail panel */
  sections: PackageSection[];
  /** Total price (may differ from base price with extras) */
  total?: number;
  /** Extra items section (after total) */
  extras?: PackageSection;
  /** Terms and conditions */
  terms?: string;
}

/** A similar package from a nearby verified provider */
export interface NearbyVerifiedPackage {
  /** Unique ID */
  id: string;
  /** Package name */
  packageName: string;
  /** Package price in dollars */
  price: number;
  /** Provider name */
  providerName: string;
  /** Provider location */
  location: string;
  /** Provider rating */
  rating?: number;
  /** Number of reviews */
  reviewCount?: number;
}

/** Props for the UnverifiedPackageT3 page component */
export interface UnverifiedPackageT3Props {
  /** Provider summary shown at top of the list panel (no image — unverified provider) */
  provider: UnverifiedPackageT3Provider;
  /** Packages matching the user's filters from the previous step */
  packages: UnverifiedPackageT3Data[];
  /** Similar packages from nearby verified providers */
  nearbyPackages?: NearbyVerifiedPackage[];
  /** Currently selected package ID */
  selectedPackageId: string | null;
  /** Callback when a package is selected */
  onSelectPackage: (id: string) => void;
  /** Callback when "Make Arrangement" is clicked (opens ArrangementDialog) */
  onArrange: () => void;
  /** Callback when a nearby verified package is clicked */
  onNearbyPackageClick?: (id: string) => void;
  /** Callback when the provider card is clicked (opens provider profile popup) */
  onProviderClick?: () => void;
  /** Callback for the Back button */
  onBack: () => void;
  /** Validation error */
  error?: string;
  /** Whether the arrange action is loading */
  loading?: boolean;
  /** Navigation bar */
  navigation?: React.ReactNode;
  /** Whether this is a pre-planning flow */
  isPrePlanning?: boolean;
  /** MUI sx prop */
  sx?: SxProps<Theme>;
}

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

/**
 * UnverifiedPackageT3 — Package selection page for unverified (Tier 3) providers.
 *
 * List + Detail split layout. Left panel shows the selected provider
 * (compact) and selectable package cards. Right panel shows the full
 * detail breakdown of the selected package with "Make Arrangement" CTA.
 *
 * Two sections:
 * - **This provider's packages**: estimated pricing from publicly available info
 * - **Similar packages from verified providers nearby**: promoted alternatives
 *   with verified pricing, ratings, and location
 *
 * Selecting a package reveals its detail. Clicking "Make an enquiry"
 * on the detail panel initiates contact with the unverified provider.
 *
 * Pure presentation component — props in, callbacks out.
 */
export const UnverifiedPackageT3: React.FC<UnverifiedPackageT3Props> = ({
  provider,
  packages,
  nearbyPackages = [],
  selectedPackageId,
  onSelectPackage,
  onArrange,
  onNearbyPackageClick,
  onProviderClick,
  onBack,
  error,
  loading = false,
  navigation,
  isPrePlanning = false,
  sx,
}) => {
  const selectedPackage = packages.find((p) => p.id === selectedPackageId);
  const hasNearbyPackages = nearbyPackages.length > 0;

  const subheading = isPrePlanning
    ? 'Browse estimated packages to get a sense of what this provider offers. Nothing is committed.'
    : 'These packages are based on publicly available information. Make an enquiry to confirm details and pricing.';

  return (
    <WizardLayout
      variant="list-detail"
      navigation={navigation}
      showBackLink
      backLabel="Back"
      onBack={onBack}
      sx={sx}
      secondaryPanel={
        selectedPackage ? (
          <PackageDetail
            name={selectedPackage.name}
            price={selectedPackage.price}
            sections={selectedPackage.sections}
            total={selectedPackage.total}
            extras={selectedPackage.extras}
            terms={selectedPackage.terms}
            onArrange={onArrange}
            arrangeDisabled={loading}
            arrangeLabel="Make an enquiry"
            priceDisclaimer="Prices are estimates based on publicly available information and may not reflect the provider's current pricing."
          />
        ) : (
          <Box
            sx={{
              display: 'flex',
              alignItems: 'center',
              justifyContent: 'center',
              height: '100%',
              minHeight: 300,
              bgcolor: 'var(--fa-color-brand-50)',
              borderRadius: 2,
              p: 4,
            }}
          >
            <Typography variant="body1" color="text.secondary" sx={{ textAlign: 'center' }}>
              Select a package to see what&apos;s included.
            </Typography>
          </Box>
        )
      }
    >
      {/* Provider compact card — clickable to open provider profile */}
      <Box sx={{ mb: 3 }}>
        <ProviderCardCompact
          name={provider.name}
          location={provider.location}
          rating={provider.rating}
          reviewCount={provider.reviewCount}
          onClick={onProviderClick}
        />
      </Box>

      {/* Heading */}
      <Typography variant="h4" component="h1" sx={{ mb: 0.5 }} tabIndex={-1}>
        Explore available packages
      </Typography>
      <Typography variant="body2" color="text.secondary" sx={{ mb: 3 }}>
        {subheading}
      </Typography>

      {/* Error message */}
      {error && (
        <Typography
          variant="body2"
          sx={{ mb: 2, color: 'var(--fa-color-text-brand)' }}
          role="alert"
        >
          {error}
        </Typography>
      )}

      {/* ─── Packages ─── */}
      <Box
        role="radiogroup"
        aria-label="Funeral packages"
        sx={{ display: 'flex', flexDirection: 'column', gap: 2, mb: 3 }}
      >
        {packages.map((pkg) => (
          <ServiceOption
            key={pkg.id}
            name={pkg.name}
            description={pkg.description}
            price={pkg.price}
            selected={selectedPackageId === pkg.id}
            onClick={() => onSelectPackage(pkg.id)}
          />
        ))}

        {packages.length === 0 && (
          <Box sx={{ py: 4, textAlign: 'center' }}>
            <Typography variant="body2" color="text.secondary">
              No packages match your current preferences.
            </Typography>
          </Box>
        )}
      </Box>

      {/* ─── Similar packages from nearby verified providers ─── */}
      {hasNearbyPackages && (
        <>
          <Divider sx={{ mb: 2.5 }} />
          <Box
            sx={{
              display: 'flex',
              alignItems: 'center',
              gap: 1,
              mb: 2,
            }}
          >
            <VerifiedOutlinedIcon sx={{ fontSize: 16, color: 'primary.main' }} aria-hidden />
            <Typography variant="body2" sx={{ fontWeight: 600, color: 'text.primary' }}>
              Similar packages from verified providers nearby
            </Typography>
          </Box>
          <Box
            aria-label="Similar packages from nearby verified providers"
            sx={{ display: 'flex', flexDirection: 'column', gap: 2, mb: 3 }}
          >
            {nearbyPackages.map((pkg) => (
              <Card
                key={pkg.id}
                variant="outlined"
                interactive={!!onNearbyPackageClick}
                padding="none"
                onClick={onNearbyPackageClick ? () => onNearbyPackageClick(pkg.id) : undefined}
                sx={{ p: 'var(--fa-card-padding-compact)' }}
              >
                {/* Package name + price */}
                <Box
                  sx={{
                    display: 'flex',
                    alignItems: 'flex-start',
                    justifyContent: 'space-between',
                    gap: 2,
                    mb: 1,
                  }}
                >
                  <Typography variant="h6" component="span">
                    {pkg.packageName}
                  </Typography>
                  <Typography
                    variant="labelLg"
                    component="span"
                    color="primary"
                    sx={{ whiteSpace: 'nowrap' }}
                  >
                    ${pkg.price.toLocaleString('en-AU')}
                  </Typography>
                </Box>

                {/* Provider info */}
                <Box sx={{ display: 'flex', alignItems: 'center', gap: 0.5, flexWrap: 'wrap' }}>
                  <Typography variant="body2" color="text.secondary">
                    {pkg.providerName}
                  </Typography>
                  {pkg.rating != null && (
                    <>
                      <Typography variant="body2" color="text.secondary">
                        &middot;
                      </Typography>
                      <StarRoundedIcon sx={{ fontSize: 14, color: 'warning.main' }} aria-hidden />
                      <Typography variant="caption" color="text.secondary">
                        {pkg.rating}
                        {pkg.reviewCount != null ? ` (${pkg.reviewCount})` : ''}
                      </Typography>
                    </>
                  )}
                  <Typography variant="body2" color="text.secondary">
                    &middot;
                  </Typography>
                  <LocationOnOutlinedIcon
                    sx={{ fontSize: 14, color: 'text.secondary' }}
                    aria-hidden
                  />
                  <Typography variant="caption" color="text.secondary">
                    {pkg.location}
                  </Typography>
                </Box>
              </Card>
            ))}
          </Box>
        </>
      )}
    </WizardLayout>
  );
};

UnverifiedPackageT3.displayName = 'UnverifiedPackageT3';
export default UnverifiedPackageT3;