import {
  Anchor,
  Badge,
  Button,
  Group,
  Paper,
  Stack,
  Tabs,
  Text,
} from "@mantine/core";
import { Link } from "react-router-dom";
import {
  ArrowRight,
  Building2,
  FileText,
  Landmark,
  MapPin,
  Package,
  Train,
} from "lucide-react";

import type { EligibleContainerBooking, FreightType } from "@/types/trainScheduling";

import { EligibleBookingsPanel } from "./EligibleBookingsPanel";

export type AssignedBookingRow = {
  id: string;
  reference: string;
  /** Who booked it — staff scan this list by customer, not by reference. */
  customer?: string | null;
  weightTons?: number;
  isGovernment?: boolean;
  wagonsRequired?: number | null;
  contractReference?: string | null;
  origin?: string | null;
  destination?: string | null;
};

export function ScheduleBookingsStep({
  assignedBookings,
  eligibleItems,
  eligibleLoading,
  selectedIds,
  onSelectionChange,
  assignedIds,
  freightType,
  canRemove,
  onRemove,
  onSwitch,
}: {
  assignedBookings: AssignedBookingRow[];
  eligibleItems: EligibleContainerBooking[];
  eligibleLoading?: boolean;
  selectedIds: string[];
  onSelectionChange: (ids: string[]) => void;
  assignedIds?: string[];
  freightType?: FreightType;
  canRemove?: boolean;
  onRemove?: (bookingId: string) => void;
  onSwitch?: (booking: EligibleContainerBooking) => void;
}) {
  return (
    <Paper p="md" radius="lg" withBorder style={{ borderColor: "var(--mantine-color-gray-2)" }}>
      <Tabs
        defaultValue={assignedBookings.length ? "on-train" : "add"}
        radius="md"
        variant="pills"
        color="edr-green"
      >
        <Tabs.List mb="md">
          <Tabs.Tab
            value="on-train"
            leftSection={<Train size={14} />}
            rightSection={
              assignedBookings.length ? (
                <Badge size="xs" variant="light" color="edr-green" circle>
                  {assignedBookings.length}
                </Badge>
              ) : undefined
            }
          >
            On this train
          </Tabs.Tab>
          <Tabs.Tab value="add" leftSection={<Package size={14} />}>
            Add bookings
          </Tabs.Tab>
        </Tabs.List>

        <Tabs.Panel value="on-train">
          {assignedBookings.length ? (
            <Stack gap="sm">
              {assignedBookings.map((booking) => (
                <Group
                  key={booking.id}
                  justify="space-between"
                  p="sm"
                  style={{
                    border: "1px solid var(--mantine-color-edr-green-2)",
                    borderRadius: 12,
                    background: "var(--mantine-color-edr-green-0)",
                  }}
                >
                  <Stack gap={4}>
                    <Group gap="xs">
                      {/* Only the reference is the link — the row also carries a
                          Remove button, so an interactive control must not nest
                          inside the anchor. */}
                      <Anchor
                        component={Link}
                        to={`/dashboard/booking-requests/${booking.id}`}
                        fw={600}
                        size="sm"
                        c="edr-green.8"
                        underline="hover"
                      >
                        {booking.reference}
                      </Anchor>
                      {booking.weightTons != null ? (
                        <Badge variant="outline" size="xs" color="edr-green">
                          {booking.weightTons}T
                        </Badge>
                      ) : null}
                      {booking.wagonsRequired != null ? (
                        <Badge
                          variant="outline"
                          size="xs"
                          color="gray"
                          leftSection={<Train size={10} />}
                        >
                          {booking.wagonsRequired} wagon{booking.wagonsRequired === 1 ? "" : "s"}
                        </Badge>
                      ) : null}
                      {booking.isGovernment ? (
                        <Badge
                          variant="light"
                          size="xs"
                          color="yellow"
                          leftSection={<Landmark size={10} />}
                        >
                          Government
                        </Badge>
                      ) : null}
                    </Group>
                    {booking.customer ? (
                      <Group gap={4}>
                        <Building2 size={12} />
                        <Text size="xs" c="dimmed">
                          {booking.customer}
                        </Text>
                      </Group>
                    ) : null}
                    {booking.contractReference || booking.origin || booking.destination ? (
                      <Group gap="xs">
                        {booking.contractReference ? (
                          <Group gap={4}>
                            <FileText size={12} />
                            <Text size="xs" c="dimmed">
                              {booking.contractReference}
                            </Text>
                          </Group>
                        ) : null}
                        {booking.origin || booking.destination ? (
                          <Group gap={4}>
                            <MapPin size={12} />
                            <Text size="xs" c="dimmed">
                              {booking.origin ?? "?"} → {booking.destination ?? "?"}
                            </Text>
                          </Group>
                        ) : null}
                      </Group>
                    ) : null}
                    <Group gap={6}>
                      <Text size="xs" c="dimmed">
                        Assigned to this consist
                      </Text>
                      <ArrowRight size={12} />
                      <Text size="xs" c="edr-green.7" fw={500}>
                        Ready for wagon plan
                      </Text>
                    </Group>
                  </Stack>
                  {canRemove && onRemove ? (
                    <Button
                      variant="subtle"
                      color="red"
                      size="compact-xs"
                      onClick={() => onRemove(booking.id)}
                    >
                      Remove
                    </Button>
                  ) : null}
                </Group>
              ))}
            </Stack>
          ) : (
            <Text size="sm" c="dimmed" ta="center" py="lg">
              No bookings on this train yet. Use the Add bookings tab to select eligible cargo.
            </Text>
          )}
        </Tabs.Panel>

        <Tabs.Panel value="add">
          <EligibleBookingsPanel
            items={eligibleItems}
            isLoading={eligibleLoading}
            selectedIds={selectedIds}
            onSelectionChange={onSelectionChange}
            assignedIds={assignedIds}
            freightType={freightType}
            onSwitch={onSwitch}
          />
        </Tabs.Panel>
      </Tabs>
    </Paper>
  );
}