import type { ActionFunctionArgs, LoaderFunctionArgs } from "react-router";
import { Form, useActionData, useLoaderData, useNavigation } from "react-router";
import prisma from "../db.server";
import { adminContext, formBool, formString } from "../lib/admin.server";
import { logAccess } from "../lib/audit.server";
import { METHOD_LABEL, STATUS_TONE, money, niceDate, slotLabel } from "../lib/format";
import { rescheduleBooking, rescheduleOptions } from "../services/bookings.server";
import type { Method } from "../engine/types";

export const loader = async ({ request, params }: LoaderFunctionArgs) => {
  const { cfg, actor } = await adminContext(request);
  logAccess(cfg.shop.id, actor, "booking.view", params.id ?? null);
  const b = await prisma.booking.findFirst({
    where: { id: params.id, shopId: cfg.shop.id },
    include: { events: { orderBy: { at: "desc" } }, reminderJobs: { orderBy: { sendAt: "asc" } } },
  });
  if (!b) throw new Response("Not found", { status: 404 });
  const options = ["confirmed", "needs_review"].includes(b.status) ? await rescheduleOptions(cfg.shop.domain, b.id, { customer: false }) : [];
  return {
    b: {
      ...b,
      startUtc: b.startUtc?.toISOString() ?? null,
      createdAt: b.createdAt.toISOString(),
      events: b.events.map((e) => ({ ...e, at: e.at.toISOString() })),
      reminderJobs: b.reminderJobs.map((j) => ({ id: j.id, channel: j.channel, status: j.status, sendAt: j.sendAt.toISOString(), lastError: j.lastError })),
    },
    location: cfg.locations.find((l) => l.id === b.locationId)?.name ?? null,
    options: options.slice(0, 400),
    currency: cfg.shop.currency,
    orderUrl: b.orderId ? `shopify://admin/orders/${b.orderId.split("/").pop()}` : null,
  };
};

export const action = async ({ request, params }: ActionFunctionArgs) => {
  const { cfg, actor } = await adminContext(request);
  const fd = await request.formData();
  const intent = formString(fd, "intent");
  if (intent === "dismiss") {
    await prisma.booking.updateMany({ where: { id: params.id, shopId: cfg.shop.id, status: "confirmed" }, data: { reviewReason: null } });
    return { ok: true, message: "Marked as checked" };
  }
  const [locationId, method, date, slot] = formString(fd, "target").split("|");
  if (!slot) return { ok: false, message: "Choose a new time" };
  const r = await rescheduleBooking({
    domain: cfg.shop.domain,
    bookingId: params.id!,
    sel: { locationId, method: method as Method, date, slot },
    actor,
    force: formBool(fd, "force"),
  });
  return r.ok ? { ok: true, message: "Booking moved. Reminders were re-planned." } : { ok: false, message: r.message };
};

export default function BookingDetail() {
  const { b, location, options, currency, orderUrl } = useLoaderData<typeof loader>();
  const result = useActionData<typeof action>();
  const busy = useNavigation().state !== "idle";
  const addr = (b.address ?? {}) as { line1?: string; city?: string; postal?: string };
  const items = (b.items ?? []) as { title: string; quantity: number }[];
  return (
    <s-page heading={b.orderName ?? "Booking"}>
      {orderUrl && <s-button slot="secondary-actions" href={orderUrl}>Open order</s-button>}
      {result && <s-banner tone={result.ok ? "success" : "critical"}>{result.message}</s-banner>}
      {b.status === "needs_review" && (
        <s-banner tone="critical" heading="This order needs a time">
          <s-paragraph>{b.reviewReason}. Pick a time below to confirm it, or tick "allow over capacity" if you can fit it in.</s-paragraph>
        </s-banner>
      )}
      {b.status === "confirmed" && b.reviewReason && (
        <s-banner tone="warning" heading="Check this order">
          <s-stack gap="base">
            <s-paragraph>{b.reviewReason}</s-paragraph>
            <Form method="post">
              <input type="hidden" name="intent" value="dismiss" />
              <s-button type="submit">Mark as checked</s-button>
            </Form>
          </s-stack>
        </s-banner>
      )}
      <s-section heading="Booking">
        <s-grid gridTemplateColumns="repeat(auto-fit, minmax(180px, 1fr))" gap="base">
          <Field label="Status"><s-badge tone={STATUS_TONE[b.status] ?? "neutral"}>{b.status.replace("_", " ")}</s-badge></Field>
          <Field label="Method">{METHOD_LABEL[b.method]}</Field>
          <Field label="Location">{location ?? "—"}</Field>
          <Field label="Date">{niceDate(b.date, true)}</Field>
          <Field label="Time">{b.method === "shipping" ? "Dispatch day" : slotLabel(b.slotStart, b.slotEnd)}</Field>
          <Field label="Fee paid">{money(b.fee, currency)}</Field>
          <Field label="Customer">{[b.customerName, b.customerEmail, b.customerPhone].filter(Boolean).join(" · ") || "—"}</Field>
          <Field label="Address">{[addr.line1, addr.city, addr.postal].filter(Boolean).join(", ") || "—"}</Field>
          <Field label="Items">{items.map((i) => `${i.quantity}× ${i.title}`).join(", ") || "—"}</Field>
          <Field label="Rule version">v{b.configVersion}</Field>
        </s-grid>
      </s-section>
      {options.length > 0 && (
        <s-section heading={b.status === "needs_review" ? "Choose a time" : "Move to another time"}>
          <Form method="post">
            <s-stack gap="base">
              <s-select label="New time" name="target">
                {options.map((o) => (
                  <s-option key={`${o.date}|${o.slot}`} value={`${o.locationId}|${o.method}|${o.date}|${o.slot}`}>
                    {`${niceDate(o.date)} · ${o.method === "shipping" ? "dispatch" : slotLabel(o.start, o.end)} · ${o.full ? "full" : o.remaining == null ? "open" : `${o.remaining} left`}`}
                  </s-option>
                ))}
              </s-select>
              <s-checkbox name="force" label="Allow over capacity" details="Only for times marked full. Recorded in the history." />
              <s-paragraph>The current place is released only if the new one saves. The customer isn't messaged automatically.</s-paragraph>
              <s-button type="submit" variant="primary" loading={busy}>Save new time</s-button>
            </s-stack>
          </Form>
        </s-section>
      )}
      <s-section heading="Reminders">
        {b.reminderJobs.length === 0 ? (
          <s-paragraph>No reminders planned.</s-paragraph>
        ) : (
          <s-unordered-list>
            {b.reminderJobs.map((j) => (
              <s-list-item key={j.id}>
                {j.channel} · {new Date(j.sendAt).toLocaleString("en-CA")} · {j.status}
                {j.lastError ? ` (${j.lastError})` : ""}
              </s-list-item>
            ))}
          </s-unordered-list>
        )}
      </s-section>
      <s-section heading="History">
        <s-unordered-list>
          {b.events.map((e) => (
            <s-list-item key={e.id}>
              {new Date(e.at).toLocaleString("en-CA")} · {e.actor} · {e.action}
              {e.before ? ` · from ${describe(e.before)}` : ""}
              {e.after ? ` · to ${describe(e.after)}` : ""}
            </s-list-item>
          ))}
        </s-unordered-list>
      </s-section>
    </s-page>
  );
}

function describe(v: unknown) {
  const o = v as Record<string, unknown>;
  if (o.date) return `${o.date} ${o.slot ?? ""}`.trim() + (o.forced ? " (over capacity)" : "");
  return Object.entries(o).map(([k, x]) => `${k}: ${String(x)}`).join(", ");
}

function Field({ label, children }: { label: string; children: React.ReactNode }) {
  return (
    <s-stack gap="small-300">
      <s-text color="subdued">{label}</s-text>
      <s-text>{children}</s-text>
    </s-stack>
  );
}