'use client';

/**
 * Linked-berths list — plan §5.5.
 *
 * Shows every berth currently linked to the interest with per-row controls:
 *   - "Specifically pitching" toggle (`is_specific_interest`) — drives the
 *     public-map "Under Offer" sub-status. Each state surfaces its consequence
 *     in plain text below the toggle.
 *   - "Mark in EOI bundle" toggle (`is_in_eoi_bundle`).
 *   - "Set as primary" button when this row isn't already primary. The
 *     service helper handles the demote-prior-primary case in a single tx.
 *   - "Bypass EOI for this berth" with a reason textarea. Only rendered when
 *     the parent interest's `eoiStatus === 'signed'`. Writes
 *     `eoi_bypass_reason`, `eoi_bypassed_by`, `eoi_bypassed_at`.
 *   - "Remove" — calls `removeInterestBerth`.
 */

import { useState } from 'react';
import Link from 'next/link';
import { useParams } from 'next/navigation';
import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
import { Anchor, Loader2, Star, Trash2 } from 'lucide-react';

import { Button } from '@/components/ui/button';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import { Label } from '@/components/ui/label';
import { StatusPill, type StatusPillStatus } from '@/components/ui/status-pill';
import { Switch } from '@/components/ui/switch';
import { Textarea } from '@/components/ui/textarea';
import {
  Tooltip,
  TooltipContent,
  TooltipProvider,
  TooltipTrigger,
} from '@/components/ui/tooltip';
import { HelpCircle } from 'lucide-react';
import { apiFetch } from '@/lib/api/client';
import { cn } from '@/lib/utils';

// ─── Types (mirror the API GET shape — see interest-berths.service.ts) ─────

export interface LinkedBerthRow {
  id: string;
  interestId: string;
  berthId: string;
  isPrimary: boolean;
  isSpecificInterest: boolean;
  isInEoiBundle: boolean;
  eoiBypassReason: string | null;
  eoiBypassedBy: string | null;
  eoiBypassedAt: string | null;
  addedBy: string | null;
  addedAt: string;
  notes: string | null;
  mooringNumber: string | null;
  area: string | null;
  status: string;
  lengthFt: string | null;
  widthFt: string | null;
  draftFt: string | null;
}

interface LinkedBerthsResponse {
  data: LinkedBerthRow[];
  meta: { eoiStatus: string | null };
}

interface LinkedBerthsListProps {
  interestId: string;
}

// ─── Helpers ────────────────────────────────────────────────────────────────

function statusToPill(status: string): StatusPillStatus {
  switch (status) {
    case 'available':
      return 'active';
    case 'under_offer':
      return 'sent';
    case 'sold':
      return 'completed';
    case 'reserved':
      return 'partial';
    default:
      return 'pending';
  }
}

function formatStatus(status: string): string {
  return status.replace(/_/g, ' ').replace(/\b\w/g, (m) => m.toUpperCase());
}

function formatDimensions(
  length: string | null,
  width: string | null,
  draft: string | null,
): string | null {
  const parts: string[] = [];
  const toNum = (v: string | null) => {
    if (v === null) return null;
    const n = parseFloat(v);
    return Number.isFinite(n) ? n : null;
  };
  const l = toNum(length);
  const w = toNum(width);
  const d = toNum(draft);
  if (l !== null) parts.push(`${l.toFixed(1)}ft L`);
  if (w !== null) parts.push(`${w.toFixed(1)}ft W`);
  if (d !== null) parts.push(`${d.toFixed(1)}ft D`);
  return parts.length > 0 ? parts.join(' · ') : null;
}

const SPECIFIC_CONSEQUENCE_ON = 'This berth will appear as under interest on the public map.';
const SPECIFIC_CONSEQUENCE_OFF = 'This berth is hidden from the public map.';

// ─── Hooks ──────────────────────────────────────────────────────────────────

function useLinkedBerths(interestId: string) {
  return useQuery({
    queryKey: ['interest-berths', interestId] as const,
    queryFn: () => apiFetch<LinkedBerthsResponse>(`/api/v1/interests/${interestId}/berths`),
    staleTime: 30_000,
  });
}

interface PatchPayload {
  isPrimary?: boolean;
  isSpecificInterest?: boolean;
  isInEoiBundle?: boolean;
  eoiBypassReason?: string | null;
}

function useUpdateLink(interestId: string) {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: async (args: { berthId: string; patch: PatchPayload }) =>
      apiFetch(`/api/v1/interests/${interestId}/berths/${args.berthId}`, {
        method: 'PATCH',
        body: args.patch,
      }),
    onSuccess: () => {
      qc.invalidateQueries({ queryKey: ['interest-berths', interestId] });
      qc.invalidateQueries({ queryKey: ['interests', interestId] });
    },
  });
}

function useRemoveLink(interestId: string) {
  const qc = useQueryClient();
  return useMutation({
    mutationFn: async (berthId: string) =>
      apiFetch(`/api/v1/interests/${interestId}/berths/${berthId}`, { method: 'DELETE' }),
    onSuccess: () => {
      qc.invalidateQueries({ queryKey: ['interest-berths', interestId] });
      qc.invalidateQueries({ queryKey: ['interests', interestId] });
      qc.invalidateQueries({ queryKey: ['berth-recommendations', interestId] });
    },
  });
}

// ─── Bypass dialog ──────────────────────────────────────────────────────────

interface BypassDialogProps {
  row: LinkedBerthRow;
  open: boolean;
  onOpenChange: (open: boolean) => void;
  onSubmit: (reason: string | null) => void;
  isPending: boolean;
}

function BypassDialog({ row, open, onOpenChange, onSubmit, isPending }: BypassDialogProps) {
  const [reason, setReason] = useState(row.eoiBypassReason ?? '');
  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent>
        <DialogHeader>
          <DialogTitle>Bypass EOI for berth {row.mooringNumber}</DialogTitle>
          <DialogDescription>
            Record why this berth&apos;s individual EOI is being waived. The interest&apos;s primary
            EOI signature will cover it instead.
          </DialogDescription>
        </DialogHeader>
        <div className="space-y-2">
          <Label htmlFor={`bypass-reason-${row.berthId}`} className="text-xs">
            Reason
          </Label>
          <Textarea
            id={`bypass-reason-${row.berthId}`}
            value={reason}
            onChange={(e) => setReason(e.target.value)}
            placeholder="e.g. covered under bundle EOI signed 2025-04-12"
            rows={4}
          />
        </div>
        <DialogFooter className="gap-2 sm:gap-2">
          {row.eoiBypassReason ? (
            <Button
              type="button"
              variant="outline"
              onClick={() => onSubmit(null)}
              disabled={isPending}
            >
              Clear bypass
            </Button>
          ) : null}
          <Button
            type="button"
            variant="outline"
            onClick={() => onOpenChange(false)}
            disabled={isPending}
          >
            Cancel
          </Button>
          <Button
            type="button"
            onClick={() => onSubmit(reason.trim().length > 0 ? reason.trim() : null)}
            disabled={isPending || reason.trim().length === 0}
          >
            {isPending ? <Loader2 className="mr-1.5 size-3.5 animate-spin" /> : null}
            Save bypass
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

// ─── Row ────────────────────────────────────────────────────────────────────

interface RowProps {
  row: LinkedBerthRow;
  portSlug: string;
  eoiStatus: string | null;
  onUpdate: (berthId: string, patch: PatchPayload) => void;
  onRemove: (berthId: string) => void;
  isPending: boolean;
}

function LinkedBerthRowItem({ row, portSlug, eoiStatus, onUpdate, onRemove, isPending }: RowProps) {
  const [bypassOpen, setBypassOpen] = useState(false);
  const [confirmRemove, setConfirmRemove] = useState(false);
  const dims = formatDimensions(row.lengthFt, row.widthFt, row.draftFt);
  const showBypassControl = eoiStatus === 'signed';

  return (
    <div
      className={cn(
        'rounded-lg border bg-card p-3 text-sm',
        row.isPrimary ? 'border-brand-300 ring-1 ring-brand-200' : 'border-border',
      )}
    >
      <div className="flex flex-wrap items-start justify-between gap-2">
        <div className="min-w-0 space-y-1">
          <div className="flex flex-wrap items-center gap-2">
            <Link
              href={`/${portSlug}/berths/${row.berthId}`}
              className="font-semibold text-primary hover:underline"
            >
              {row.mooringNumber ?? row.berthId}
            </Link>
            {row.area ? <span className="text-xs text-muted-foreground">{row.area}</span> : null}
            <StatusPill status={statusToPill(row.status)}>{formatStatus(row.status)}</StatusPill>
            {row.isPrimary ? (
              <span className="inline-flex items-center gap-1 rounded-md border border-brand-200 bg-brand-50 px-2 py-0.5 text-xs font-medium text-brand-800">
                <Star className="size-3" />
                Primary
              </span>
            ) : null}
            {row.eoiBypassReason ? (
              <span className="inline-flex items-center rounded-md border border-amber-200 bg-amber-50 px-2 py-0.5 text-xs font-medium text-amber-800">
                EOI bypassed
              </span>
            ) : null}
          </div>
          {dims ? <div className="text-xs text-muted-foreground">{dims}</div> : null}
        </div>
        <div className="flex flex-wrap items-center gap-2">
          {!row.isPrimary ? (
            <Button
              type="button"
              size="sm"
              variant="outline"
              onClick={() => onUpdate(row.berthId, { isPrimary: true })}
              disabled={isPending}
            >
              <Star className="mr-1.5 size-3.5" />
              Set as primary
            </Button>
          ) : null}
          <Button
            type="button"
            size="sm"
            variant="ghost"
            onClick={() => setConfirmRemove(true)}
            disabled={isPending}
            className="text-destructive hover:text-destructive"
            aria-label={`Remove berth ${row.mooringNumber ?? row.berthId}`}
          >
            <Trash2 className="size-3.5" />
          </Button>
        </div>
      </div>

      <TooltipProvider delayDuration={200}>
        <div className="mt-3 grid grid-cols-1 gap-3 border-t pt-3 sm:grid-cols-2">
          <div className="space-y-1">
            {/* Switch sits next to its label (gap-2.5) instead of being
                flexed to the far right via justify-between — when the
                column is wide, justify-between created a confusing visual
                gulf between the action and what it controls. */}
            <div className="flex items-center gap-2.5">
              <Switch
                id={`specific-${row.berthId}`}
                checked={row.isSpecificInterest}
                disabled={isPending}
                onCheckedChange={(checked) =>
                  onUpdate(row.berthId, { isSpecificInterest: checked })
                }
              />
              <Label
                htmlFor={`specific-${row.berthId}`}
                className="text-sm font-medium cursor-pointer"
              >
                Specifically pitching
              </Label>
              <Tooltip>
                <TooltipTrigger asChild>
                  <button
                    type="button"
                    className="inline-flex h-5 w-5 items-center justify-center rounded-full text-muted-foreground hover:bg-muted/60 hover:text-foreground"
                    aria-label="What does Specifically pitching do?"
                  >
                    <HelpCircle className="h-3.5 w-3.5" />
                  </button>
                </TooltipTrigger>
                <TooltipContent side="top" className="max-w-xs text-[11px] leading-snug">
                  Mark this berth as one your client is actively considering. When on, the berth
                  appears as <strong>Under Offer</strong> on the public map and counts toward the
                  recommender&apos;s &quot;heat&quot; score. Turn off if the link is legal/EOI-only.
                </TooltipContent>
              </Tooltip>
            </div>
            <p className="text-xs text-muted-foreground">
              {row.isSpecificInterest ? SPECIFIC_CONSEQUENCE_ON : SPECIFIC_CONSEQUENCE_OFF}
            </p>
          </div>
          <div className="space-y-1">
            <div className="flex items-center gap-2.5">
              <Switch
                id={`bundle-${row.berthId}`}
                checked={row.isInEoiBundle}
                disabled={isPending}
                onCheckedChange={(checked) => onUpdate(row.berthId, { isInEoiBundle: checked })}
              />
              <Label
                htmlFor={`bundle-${row.berthId}`}
                className="text-sm font-medium cursor-pointer"
              >
                Mark in EOI bundle
              </Label>
              <Tooltip>
                <TooltipTrigger asChild>
                  <button
                    type="button"
                    className="inline-flex h-5 w-5 items-center justify-center rounded-full text-muted-foreground hover:bg-muted/60 hover:text-foreground"
                    aria-label="What does Mark in EOI bundle do?"
                  >
                    <HelpCircle className="h-3.5 w-3.5" />
                  </button>
                </TooltipTrigger>
                <TooltipContent side="top" className="max-w-xs text-[11px] leading-snug">
                  Include this berth in the EOI&apos;s signed berth range. When on, the berth is
                  covered by the same signature and shows up in the EOI&apos;s
                  <strong> Berth Range</strong> form field (e.g. &quot;A1-A3, B5-B7&quot;). Turn off
                  to keep the link without legal coverage.
                </TooltipContent>
              </Tooltip>
            </div>
            <p className="text-xs text-muted-foreground">
              {row.isInEoiBundle
                ? 'Covered by the interest’s EOI signature.'
                : 'Not covered by the EOI bundle.'}
            </p>
          </div>
        </div>
      </TooltipProvider>

      {showBypassControl ? (
        // Bypass section reads as a third toggle-style row: label + description
        // on the left, action button inline with the description so it doesn't
        // float far-right while the toggles above are anchored left.
        <div className="mt-3 flex flex-wrap items-center gap-3 border-t pt-3">
          <div className="min-w-0 flex-1 space-y-0.5">
            <p className="text-sm font-medium">Bypass EOI for this berth</p>
            {row.eoiBypassReason ? (
              <p className="text-xs text-muted-foreground">
                <span className="font-medium text-foreground/80">Bypassed:</span>{' '}
                {row.eoiBypassReason}
              </p>
            ) : (
              <p className="text-xs text-muted-foreground">
                Record a reason if this berth doesn&apos;t need its own EOI.
              </p>
            )}
          </div>
          <Button
            type="button"
            size="sm"
            variant="outline"
            onClick={() => setBypassOpen(true)}
            disabled={isPending}
          >
            {row.eoiBypassReason ? 'Edit bypass' : 'Add bypass'}
          </Button>
        </div>
      ) : null}

      {bypassOpen ? (
        <BypassDialog
          row={row}
          open={bypassOpen}
          onOpenChange={setBypassOpen}
          isPending={isPending}
          onSubmit={(reason) => {
            onUpdate(row.berthId, { eoiBypassReason: reason });
            setBypassOpen(false);
          }}
        />
      ) : null}

      <Dialog open={confirmRemove} onOpenChange={setConfirmRemove}>
        <DialogContent>
          <DialogHeader>
            <DialogTitle>Remove berth {row.mooringNumber} from interest?</DialogTitle>
            <DialogDescription>
              The berth itself isn&apos;t deleted — only its link to this interest.
            </DialogDescription>
          </DialogHeader>
          <DialogFooter className="gap-2 sm:gap-2">
            <Button
              type="button"
              variant="outline"
              onClick={() => setConfirmRemove(false)}
              disabled={isPending}
            >
              Cancel
            </Button>
            <Button
              type="button"
              variant="destructive"
              onClick={() => {
                onRemove(row.berthId);
                setConfirmRemove(false);
              }}
              disabled={isPending}
            >
              Remove
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </div>
  );
}

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

export function LinkedBerthsList({ interestId }: LinkedBerthsListProps) {
  const params = useParams<{ portSlug: string }>();
  const portSlug = params?.portSlug ?? '';
  const { data, isLoading } = useLinkedBerths(interestId);
  const updateMutation = useUpdateLink(interestId);
  const removeMutation = useRemoveLink(interestId);

  const rows = data?.data ?? [];
  const eoiStatus = data?.meta.eoiStatus ?? null;
  const isPending = updateMutation.isPending || removeMutation.isPending;

  return (
    <Card>
      <CardHeader>
        <CardTitle className="flex items-center gap-2 text-base">
          <Anchor className="size-4 text-brand-600" />
          Linked berths{rows.length > 0 ? ` (${rows.length})` : ''}
        </CardTitle>
      </CardHeader>
      <CardContent className="space-y-3">
        {isLoading ? (
          <div className="space-y-2">
            {[0, 1].map((i) => (
              <div key={i} className="h-24 animate-pulse rounded-lg bg-muted" />
            ))}
          </div>
        ) : rows.length === 0 ? (
          <p className="py-6 text-center text-sm text-muted-foreground">
            No berths linked yet. Use the recommender below to add one.
          </p>
        ) : (
          <div className="space-y-2">
            {rows.map((row) => (
              <LinkedBerthRowItem
                key={row.id}
                row={row}
                portSlug={portSlug}
                eoiStatus={eoiStatus}
                onUpdate={(berthId, patch) => updateMutation.mutate({ berthId, patch })}
                onRemove={(berthId) => removeMutation.mutate(berthId)}
                isPending={isPending}
              />
            ))}
          </div>
        )}
        {updateMutation.isError ? (
          <p className="text-sm text-destructive">
            {(updateMutation.error as Error)?.message ?? 'Failed to update berth.'}
          </p>
        ) : null}
        {removeMutation.isError ? (
          <p className="text-sm text-destructive">
            {(removeMutation.error as Error)?.message ?? 'Failed to remove berth.'}
          </p>
        ) : null}
      </CardContent>
    </Card>
  );
}