"use client";

import * as React from "react";
import { ExternalLink, Loader2 } from "lucide-react";

import { Button } from "@/components/ui/button";
import { api } from "@/lib/trpc";
import { usePanelStore } from "@/lib/stores/panel-store";
import { cn } from "@/lib/utils";

import type { FormField } from "./form-renderer";

function formatCellValue(value: unknown): string {
  if (value === undefined || value === null) return "—";
  if (typeof value === "string" || typeof value === "number" || typeof value === "boolean") {
    return String(value);
  }
  if (Array.isArray(value)) {
    return value.map((x) => (typeof x === "string" ? x : JSON.stringify(x))).join(", ");
  }
  try {
    return JSON.stringify(value);
  } catch {
    return "—";
  }
}

function tableColumns(fields: FormField[]): FormField[] {
  return fields.filter((f) => f.type !== "section_header" && f.type !== "divider");
}

export interface FormResponsesProps {
  formId: string;
  fields: FormField[];
  className?: string;
}

export function FormResponses({ formId, fields, className }: FormResponsesProps) {
  const open = usePanelStore((s) => s.open);
  const cols = React.useMemo(() => tableColumns(fields), [fields]);

  const listQuery = api.forms.listResponses.useQuery(
    { formId },
    { enabled: Boolean(formId) },
  );

  if (listQuery.isPending) {
    return (
      <div className={cn("flex justify-center py-12", className)}>
        <Loader2 className="size-6 animate-spin text-muted-foreground" aria-hidden />
        <span className="sr-only">Loading responses</span>
      </div>
    );
  }

  if (listQuery.isError) {
    return (
      <p className={cn("text-sm text-muted-foreground", className)}>
        Could not load responses.
      </p>
    );
  }

  const rows = listQuery.data?.responses ?? [];

  if (rows.length === 0) {
    return (
      <p className={cn("text-sm text-muted-foreground", className)}>No responses yet.</p>
    );
  }

  return (
    <div className={cn("w-full overflow-x-auto rounded-md border border-border", className)}>
      <table className="w-full min-w-[640px] border-collapse text-left text-sm">
        <thead>
          <tr className="border-b border-border bg-muted/40">
            {cols.map((f) => (
              <th
                key={f.id}
                className="whitespace-nowrap px-3 py-2 font-medium text-muted-foreground"
              >
                {f.label}
              </th>
            ))}
            <th className="whitespace-nowrap px-3 py-2 font-medium text-muted-foreground">
              Submitted
            </th>
            <th className="whitespace-nowrap px-3 py-2 font-medium text-muted-foreground">
              Task
            </th>
          </tr>
        </thead>
        <tbody>
          {rows.map((row) => {
            const data =
              row.data && typeof row.data === "object" && row.data !== null
                ? (row.data as Record<string, unknown>)
                : {};

            const submitted =
              row.submittedAt instanceof Date
                ? row.submittedAt.toLocaleString()
                : String(row.submittedAt ?? "—");

            return (
              <tr key={row.id} className="border-b border-border last:border-0">
                {cols.map((f) => (
                  <td key={f.id} className="max-w-[240px] truncate px-3 py-2 align-top">
                    {formatCellValue(data[f.id])}
                  </td>
                ))}
                <td className="whitespace-nowrap px-3 py-2 align-top text-muted-foreground">
                  {submitted}
                </td>
                <td className="px-3 py-2 align-top">
                  {row.createdObjectId ? (
                    <Button
                      type="button"
                      variant="link"
                      className="inline-flex h-auto items-center gap-1 p-0 text-primary"
                      onClick={() => open("object-detail", row.createdObjectId)}
                    >
                      Open task
                      <ExternalLink className="size-3.5 opacity-70" aria-hidden />
                    </Button>
                  ) : (
                    <span className="text-muted-foreground">—</span>
                  )}
                </td>
              </tr>
            );
          })}
        </tbody>
      </table>
    </div>
  );
}