import { useTranslation } from "react-i18next";
import { type ReactNode } from "react";
import { type LedgerEvent } from "../api.js";
import { formatMoney } from "../lib/format.js";
import { renderReason } from "../lib/reason.js";
import { Modal } from "./Modal.js";
import { SnapshotStrip } from "./SnapshotStrip.js";

// Shared ledger-event presentation: the colour/label map, the clickable feed ROW, and
// the read-only DETAIL modal (full signed payload + snapshots + chain provenance). Used
// by the booth live feed AND the shift activity log so both render — and open — events
// identically. See wiki/concepts/append-only-event-chain.md.

export const EVENT_STYLE: Record<string, { labelKey: string; color: string }> = {
  vehicle_entry: { labelKey: "booth.evtEntry", color: "text-term-green" },
  vehicle_exit: { labelKey: "booth.evtExit", color: "text-term-red" },
  payment: { labelKey: "booth.evtPay", color: "text-term-cyan" },
  void: { labelKey: "booth.evtVoid", color: "text-term-amber" },
  barrier_open_command: { labelKey: "booth.evtOpenCmd", color: "text-term-muted" },
  barrier_open_observed: { labelKey: "booth.evtOpenObserved", color: "text-term-muted" },
  shift_open: { labelKey: "booth.evtShiftOpen", color: "text-term-amber" },
  shift_z_report: { labelKey: "booth.evtShiftZ", color: "text-term-amber" },
  cash_movement: { labelKey: "booth.evtCashMovement", color: "text-term-cyan" },
  cash_in: { labelKey: "booth.evtCashIn", color: "text-term-green" },
  cash_out: { labelKey: "booth.evtCashOut", color: "text-term-amber" },
  cash_review: { labelKey: "booth.evtCashReview", color: "text-term-cyan" },
  anomaly: { labelKey: "booth.evtAnomaly", color: "text-term-red" },
};

/**
 * A refused-ACTION event is a benign WARNING, not a red-flag anomaly. The ledger type is
 * `anomaly` for both (immutable history), but a refused exit / refused subscription /
 * refused entry (e.g. a double card-scan, an at-capacity subscriber, an already-closed
 * session) is an EXPECTED outcome — not fraud. We classify it from the payload flags the
 * flows already sign (`exitRefused` / `entryRefused` / `permitRefused`) and show it as an
 * amber "REFUZUAR / REFUSED" warning, reserving red "ANOMALI" for genuine anomalies
 * (barrier-open failure, opened-without-ticket, …). Display-only — no ledger change.
 */
export function isRefusedWarning(e: LedgerEvent): boolean {
  if (e.type !== "anomaly") return false;
  const p = e.payload;
  return !!(p && (p.exitRefused || p.entryRefused || p.permitRefused));
}

/** The label key + colour to render for an event, applying the refused-warning split. */
export function eventStyleFor(e: LedgerEvent): { labelKey: string; color: string } {
  if (isRefusedWarning(e)) return { labelKey: "booth.evtRefused", color: "text-term-amber" };
  return EVENT_STYLE[e.type] ?? { labelKey: "", color: "text-term-text" };
}

/** Local time-of-day, terminal style. Defensive against a bad timestamp. */
function hhmmss(iso: string): string {
  const d = new Date(iso);
  return Number.isNaN(d.getTime()) ? "--:--:--" : d.toTimeString().slice(0, 8);
}

/** Red-flag classification badges computed from the signed payload. */
export function eventBadges(p: LedgerEvent["payload"]): string[] {
  if (!p) return [];
  const keys: string[] = [];
  if (p.entryRefused) keys.push("booth.badgeEntryRefused");
  if (p.exitRefused) keys.push("booth.badgeExitRefused");
  if (p.full) keys.push("booth.badgeLotFull");
  if (p.exitOpenFailed) keys.push("booth.badgeBarrierFailed");
  if (p.permitRefused) keys.push("booth.badgeSubRefused");
  if (p.ticketPrinted === false) keys.push("booth.badgeNoTicket");
  if (p.subscriptionSale) keys.push("booth.badgeSubSale");
  // Subscriber entered outside their plan's allowed window → will owe a transient charge
  // for the minutes actually parked out-of-window, priced + collected (gated) at exit.
  // (`windowOwedMinor` is the old fixed-amount stamp, kept so historic events still badge.)
  if (p.outOfWindow === true || (typeof p.windowOwedMinor === "number" && p.windowOwedMinor > 0))
    keys.push("booth.badgeWindowCharge");
  if (p.source === "manual" && !p.subscriptionSale) keys.push("booth.badgeManualOpen");
  return keys;
}

/** The i18n key for a subscriber's access medium (`via`), or null. */
export function viaKey(p: LedgerEvent["payload"]): string | null {
  if (!p) return null;
  if (p.via === "qr") return "booth.viaQr";
  if (p.via === "card") return "booth.viaCard";
  if (p.via === "plate") return "booth.viaPlate";
  return null;
}

/** A short money summary for payment events (e.g. "350.00 ALL"). */
export function paymentSummary(p: LedgerEvent["payload"]): string | null {
  if (!p || typeof p.amountMinor !== "number" || !p.currency) return null;
  return formatMoney(p.amountMinor, p.currency);
}

/** What to SHOW for an event's actor. A subscription occurrence has an opaque
 *  `SUBSESS-…` identity; the server resolves the holder's name into `subscriberLabel`,
 *  so we show that (e.g. "Aqif Kopertoni") instead. Otherwise the identity itself. */
export function displayIdentity(e: LedgerEvent): string {
  return e.subscriberLabel ?? e.identity ?? "—";
}

/** One clickable live-feed / activity row → opens the event-detail modal. A grid keeps the
 *  time/label/#index columns aligned across rows; the identity, plate, badges and reason flow
 *  inline in the middle column and wrap there only when they run out of width. */
export function EventRow({ e, onOpen }: { e: LedgerEvent; onOpen: (e: LedgerEvent) => void }) {
  const { t } = useTranslation();
  const style = eventStyleFor(e);
  const label = style.labelKey ? t(style.labelKey) : e.type.toUpperCase();
  // A refused-action event is a benign WARNING (amber), distinct from a genuine red
  // anomaly. Only true anomalies get the red row tint + the "no reason" fallback.
  const refusedWarning = isRefusedWarning(e);
  const isAnomaly = e.type === "anomaly" && !refusedWarning;
  const p = e.payload;
  const reason = renderReason(p, t);
  const amount = paymentSummary(p);
  const badges = eventBadges(p);
  const detail = reason ?? amount ?? (isAnomaly ? t("booth.evtNoReason") : null);

  return (
    <button
      type="button"
      onClick={() => onOpen(e)}
      className={`grid w-full grid-cols-[auto_5rem_1fr_auto] items-start gap-x-3 border-b border-term-border/50 px-1 py-1 text-left text-[0.75rem] tabular-nums hover:bg-term-panel-2 ${
        isAnomaly ? "bg-term-red/5" : refusedWarning ? "bg-term-amber/5" : ""
      }`}
    >
      <span className="py-px text-term-muted">{hhmmss(e.occurredAt)}</span>
      <span className={`py-px shrink-0 font-semibold ${style.color}`}>{label}</span>
      {/* Identity + plate + detail all flow in ONE wrapping line — they fill the available
          width and only wrap to a second line when this cell actually runs out of room (no
          forced second row). Keeps time/label/#index in their columns. */}
      <span className="flex min-w-0 flex-wrap items-center gap-x-2 gap-y-1 py-px">
        <span className="break-all text-term-text">{displayIdentity(e)}</span>
        {e.plate && (
          <span
            className="shrink-0 rounded border border-term-border px-1 text-[0.6875rem] font-semibold tracking-wide text-term-amber"
            title={t("booth.plateTitle")}
          >
            {e.plate}
          </span>
        )}
        {badges.map((k) => (
          <span
            key={k}
            className="shrink-0 rounded-sm bg-term-red/15 px-1.5 py-px text-[0.625rem] font-semibold uppercase tracking-wide text-term-red"
          >
            {t(k)}
          </span>
        ))}
        {detail && (
          <span className={`${isAnomaly ? "text-term-red/90" : "text-term-muted"}`}>{detail}</span>
        )}
      </span>
      <span className="py-px text-term-muted">#{e.index}</span>
    </button>
  );
}

/** One label/value line in the event-detail modal. */
function DetailRow({ label, children }: { label: string; children: ReactNode }) {
  return (
    <div className="grid grid-cols-[8rem_1fr] gap-3 border-b border-term-border/40 py-1.5 text-[0.75rem]">
      <span className="text-[0.6875rem] uppercase tracking-wider text-term-muted">{label}</span>
      <span className="min-w-0 break-words text-term-text">{children}</span>
    </div>
  );
}

/** Full read-only detail for one ledger event: business fields + the human-readable
 *  reason + the session's entry/exit snapshots, then the signed-chain provenance
 *  (signature/prev-hash/key) for an audit trail. Read-only — the ledger is immutable;
 *  this only DISPLAYS the signed record. */
export function EventDetailModal({ e, onClose }: { e: LedgerEvent; onClose: () => void }) {
  const { t } = useTranslation();
  const style = eventStyleFor(e);
  const label = style.labelKey ? t(style.labelKey) : e.type.toUpperCase();
  const p = e.payload;
  const reason = renderReason(p, t);
  const badges = eventBadges(p);
  const isAnomaly = e.type === "anomaly" && !isRefusedWarning(e);

  // Pretty money for any minor-unit amount in the payload.
  const money =
    p && typeof p.amountMinor === "number" && typeof p.currency === "string"
      ? formatMoney(p.amountMinor, p.currency)
      : null;
  // Pull out the business fields worth a labelled row. Everything else (and the raw
  // bytes) lives behind the audit disclosure — the operator sees a clean summary.
  const sessionRef = typeof p?.sessionRef === "string" ? p.sessionRef : null;
  const plate = typeof p?.plate === "string" ? p.plate : null;
  const category = typeof p?.category === "string" ? p.category : null;
  const operator = typeof p?.operator === "string" ? p.operator : null;
  const tariffVersionId = typeof p?.tariffVersionId === "string" ? p.tariffVersionId : null;
  // cash_review fields: the admin's decision on a drawer movement (+ who / note / the
  // reviewed movement id). A flag only — it never moves cash. See wiki/concepts/shift.md.
  const decision = p?.decision === "authorize" || p?.decision === "deny" ? p.decision : null;
  const reviewedBy = typeof p?.reviewedBy === "string" ? p.reviewedBy : null;
  const reviewNote = typeof p?.note === "string" ? p.note : null;
  const refId = typeof p?.refId === "string" ? p.refId : null;

  return (
    <Modal open onClose={onClose} title={t("booth.eventDetail")} width="max-w-2xl">
      <div className="flex flex-col gap-3">
        {/* Headline: the type + localized reason, prominent for anomalies. */}
        <div className={`rounded-term border p-3 ${isAnomaly ? "border-term-red/50 bg-term-red/5" : "border-term-border bg-term-panel-2"}`}>
          <div className={`text-sm font-bold uppercase tracking-widest ${style.color}`}>{label}</div>
          {(reason || money) && (
            <div className={`mt-1 text-[0.8125rem] ${isAnomaly ? "text-term-red/90" : "text-term-text"}`}>
              {reason ?? money}
            </div>
          )}
          {!reason && !money && isAnomaly && (
            <div className="mt-1 text-[0.8125rem] text-term-red/90">{t("booth.evtNoReason")}</div>
          )}
          {badges.length > 0 && (
            <div className="mt-2 flex flex-wrap gap-1.5">
              {badges.map((k) => (
                <span
                  key={k}
                  className="rounded-sm bg-term-red/15 px-1.5 py-px text-[0.625rem] font-semibold uppercase tracking-wide text-term-red"
                >
                  {t(k)}
                </span>
              ))}
            </div>
          )}
        </div>

        {/* Humanized fields — labelled rows, not raw JSON. Only what applies renders. */}
        <div>
          <DetailRow label={t("booth.edTime")}>{new Date(e.occurredAt).toLocaleString()}</DetailRow>
          <DetailRow label={t("booth.edIndex")}>#{e.index}</DetailRow>
          {e.direction && <DetailRow label={t("booth.edDirection")}>{e.direction}</DetailRow>}
          {e.source && <DetailRow label={t("booth.edSource")}>{e.source}</DetailRow>}
          <DetailRow label={t("booth.edIdentity")}>{displayIdentity(e)}</DetailRow>
          {/* When we showed a subscriber NAME above, also expose the raw occurrence id
              (the SUBSESS-… session key) for traceability against the ledger. */}
          {e.subscriberLabel && e.identity && (
            <DetailRow label={t("booth.edOccurrence")}>
              <code className="text-[0.6875rem] text-term-muted">{e.identity}</code>
            </DetailRow>
          )}
          {money && (
            <DetailRow label={t("booth.edAmount")}>
              <span className="text-term-cyan">{money}</span>
            </DetailRow>
          )}
          {typeof p?.tender === "string" && <DetailRow label={t("booth.edTender")}>{p.tender}</DetailRow>}
          {viaKey(p) && (
            <DetailRow label={t("booth.edVia")}>
              <span className="text-term-cyan">{t(viaKey(p)!)}</span>
            </DetailRow>
          )}
          {category && <DetailRow label={t("booth.edCategory")}>{category}</DetailRow>}
          {plate && <DetailRow label={t("booth.edPlate")}>{plate}</DetailRow>}
          {operator && <DetailRow label={t("booth.edOperator")}>{operator}</DetailRow>}
          {/* cash_review: the admin's decision + who + why (for a denial). */}
          {decision && (
            <DetailRow label={t("booth.edDecision")}>
              <span className={decision === "authorize" ? "text-term-green" : "text-term-red"}>
                {t(`booth.decision.${decision}`)}
              </span>
            </DetailRow>
          )}
          {reviewedBy && <DetailRow label={t("booth.edReviewedBy")}>{reviewedBy}</DetailRow>}
          {reviewNote && <DetailRow label={t("booth.edReviewNote")}>{reviewNote}</DetailRow>}
          {refId && (
            <DetailRow label={t("booth.edReviewRef")}>
              <code className="text-[0.6875rem] text-term-muted">{refId}</code>
            </DetailRow>
          )}
          {sessionRef && sessionRef !== e.identity && (
            <DetailRow label={t("booth.edSession")}>{sessionRef}</DetailRow>
          )}
          {tariffVersionId && (
            <DetailRow label={t("booth.edTariffVersion")}>
              <code className="text-[0.6875rem] text-term-muted">{tariffVersionId}</code>
            </DetailRow>
          )}
        </div>

        {/* The entry/exit evidence images for this session's identity. */}
        {e.identity && (
          <div>
            <div className="mb-1.5 text-[0.6875rem] uppercase tracking-wider text-term-muted">{t("booth.edSnapshots")}</div>
            <SnapshotStrip identity={e.identity} />
          </div>
        )}

        {/* Audit data — collapsed by default. The signed-chain provenance (signature,
            key, prev-hash) and the raw payload are an auditor's concern, not the
            operator's; tucking them behind a disclosure keeps the common view clean
            while preserving the tamper-evidence trail on demand. */}
        <details className="rounded-term border border-term-border bg-term-panel-2">
          <summary className="cursor-pointer select-none px-3 py-2 text-[0.6875rem] uppercase tracking-wider text-term-muted hover:text-term-text">
            {t("booth.edAuditData")}
          </summary>
          <div className="border-t border-term-border px-3 pb-3 pt-1">
            <DetailRow label={t("booth.edSignature")}>
              <code className="break-all text-[0.6875rem] text-term-muted">{e.signature}</code>
            </DetailRow>
            <DetailRow label={t("booth.edKeyId")}>
              <code className="text-[0.6875rem] text-term-muted">{e.keyId}</code>
            </DetailRow>
            <DetailRow label={t("booth.edPrevHash")}>
              <code className="break-all text-[0.6875rem] text-term-muted">{e.prevHash ?? "—"}</code>
            </DetailRow>
            <div className="mb-1.5 mt-3 text-[0.6875rem] uppercase tracking-wider text-term-muted">
              {t("booth.edRawPayload")}
            </div>
            {p && Object.keys(p).length > 0 ? (
              <pre className="overflow-x-auto rounded-term border border-term-border bg-term-bg p-2 text-[0.6875rem] text-term-text">
                {JSON.stringify(p, null, 2)}
              </pre>
            ) : (
              <div className="text-[0.75rem] text-term-muted">{t("booth.edNoPayload")}</div>
            )}
          </div>
        </details>
      </div>
    </Modal>
  );
}