import { useEffect, useState } from "react";
import { Link, useParams } from "react-router-dom";
import { useTranslation } from "react-i18next";
import { api } from "../api/client";
import type { VehicleDetail as VehicleDetailData } from "../api/types";
import { useLocaleFormat } from "../i18n/format";
import { SeverityBadge, StatusBadge } from "../components/Badge";
import { Icon } from "../components/Icons";
import { ErrorState, LoadingState, PageHeader } from "../components/PageChrome";

const TABS = ["overview", "bookings", "inspections", "maintenance", "quality"] as const;
type Tab = (typeof TABS)[number];

export function VehicleDetail() {
  const { t } = useTranslation(["fleet", "bookings", "quality"]);
  const { formatNumber, formatShortDate } = useLocaleFormat();
  const { publicRef } = useParams<{ publicRef: string }>();
  const [vehicle, setVehicle] = useState<VehicleDetailData | null>(null);
  const [error, setError] = useState<string | null>(null);
  const [tab, setTab] = useState<Tab>("overview");

  useEffect(() => {
    if (!publicRef) return;
    setVehicle(null);
    setError(null);
    api
      .get<VehicleDetailData>(`/api/v1/vehicles/${publicRef}`)
      .then(setVehicle)
      .catch(() => setError(t("detail.notFound")));
  }, [publicRef]);

  if (error) return <ErrorState message={error} />;
  if (!vehicle) return <LoadingState label={t("detail.loading")} />;

  return (
    <div className="page">
      <Link className="back-link" to="/vehicles"><Icon name="arrow-left" /> {t("detail.backLink")}</Link>
      <PageHeader eyebrow={t("detail.eyebrow")} title={`${vehicle.public_ref} · ${vehicle.make} ${vehicle.model}`} description={`${vehicle.registration_number} · ${vehicle.location}`} actions={<div className="status-stack"><StatusBadge status={vehicle.operational_status} label={t(`statuses.${vehicle.operational_status}`, { defaultValue: vehicle.operational_status })} />{vehicle.attention && <span className="badge severity-high">{t("detail.needsAttention")}</span>}</div>} />

      <div role="tablist" aria-label={t("detail.tabsAriaLabel")} className="tabs" aria-orientation="horizontal">
        {TABS.map((tb) => (
          <button
            key={tb}
            role="tab"
            type="button"
            aria-selected={tab === tb}
            className={tab === tb ? "active" : ""}
            onClick={() => setTab(tb)}
          >
            {t(`detail.tabs.${tb}`)}
          </button>
        ))}
      </div>

      {tab === "overview" && (
        <section className="record-surface" aria-label={t("detail.tabs.overview")}><dl className="detail-grid">
          <div><dt>{t("detail.overview.registration")}</dt><dd>{vehicle.registration_number}</dd></div>
          <div><dt>{t("detail.overview.modelYear")}</dt><dd>{vehicle.model_year}</dd></div>
          <div><dt>{t("detail.overview.location")}</dt><dd>{vehicle.location}</dd></div>
          <div><dt>{t("detail.overview.odometer")}</dt><dd>{formatNumber(vehicle.odometer_km)} km</dd></div>
          <div><dt>{t("detail.overview.nextService")}</dt><dd>{formatNumber(vehicle.next_service_km)} km</dd></div>
          <div><dt>{t("detail.overview.active")}</dt><dd>{vehicle.active ? t("detail.yes") : t("detail.no")}</dd></div>
        </dl></section>
      )}

      {tab === "bookings" && (
        <ul className="record-list">
          {vehicle.bookings.length === 0 && <li>{t("detail.noBookings")}</li>}
          {vehicle.bookings.map((b) => (
            <li key={b.public_ref}>
              <Link to={`/bookings/${b.public_ref}`}>{b.public_ref}</Link>
              <StatusBadge status={b.status} label={t(`bookings:statuses.${b.status}`, { defaultValue: b.status })} />
              <span>
                {formatShortDate(b.starts_at)} → {formatShortDate(b.ends_at)}
              </span>
            </li>
          ))}
        </ul>
      )}

      {tab === "inspections" && (
        <ul className="record-list">
          {vehicle.inspections.length === 0 && <li>{t("detail.noInspections")}</li>}
          {vehicle.inspections.map((i) => (
            <li key={i.public_ref}>
              <span>{t(`fleet:detail.inspectionTypes.${i.type}`, { defaultValue: i.type })}</span>
              <span>{formatNumber(i.odometer_km)} km</span>
              <span>{t("detail.fuel", { percent: i.fuel_level_percent })}</span>
              {i.damage_reported && <span className="badge severity-high">{t("detail.damage")}</span>}
              {i.technical_warning && <span className="badge severity-high">{t("detail.technicalWarning")}</span>}
              <time dateTime={i.completed_at}>{formatShortDate(i.completed_at)}</time>
            </li>
          ))}
        </ul>
      )}

      {tab === "maintenance" && (
        <ul className="record-list">
          {vehicle.maintenance.length === 0 && <li>{t("detail.noMaintenance")}</li>}
          {vehicle.maintenance.map((m) => (
            <li key={m.public_ref}>
              <span>{t(`fleet:detail.maintenanceCategories.${m.category}`, { defaultValue: m.category })}</span>
              <span>{m.summary}</span>
              <time dateTime={m.occurred_at}>{formatShortDate(m.occurred_at)}</time>
            </li>
          ))}
        </ul>
      )}

      {tab === "quality" && (
        <ul className="record-list">
          {vehicle.quality_issues.length === 0 && <li>{t("detail.noQualityIssues")}</li>}
          {vehicle.quality_issues.map((q) => (
            <li key={q.public_ref}>
              <Link to={`/data-quality/${q.public_ref}`}>{q.public_ref}</Link>
              <SeverityBadge severity={q.severity} />
              <span>{t(`quality:ruleTypes.${q.rule_type}`, { defaultValue: q.rule_type.replace(/_/g, " ") })}</span>
              <StatusBadge status={q.status} label={t(`quality:list.status${q.status.charAt(0).toUpperCase()}${q.status.slice(1)}`, { defaultValue: q.status })} />
            </li>
          ))}
        </ul>
      )}
    </div>
  );
}