"use client";

import { useCallback, useMemo, useState } from "react";
import type { Priority1DemoInput } from "@/workers/rpa/priority1/demo-input";
import type { QuoteDetail, QuotePageStatus } from "@/lib/frontend/types";
import { SUBMIT_LOCK_MS } from "@/lib/frontend/constants";
import { resolvePriority1UserMessage } from "@/lib/priority1/api-errors";
import { hostCreatePriority1Quote, hostGetQuote } from "@/lib/frontend/api-client";
import { pollQuoteUntilDone } from "@/hooks/use-quote-polling";
import { formatQuoteErrorMessage } from "@/modules/quote/quote-error-messages";
import { isPriority1ManualFollowupDetail } from "@/modules/priority1/quote-outcome";
import { uuidV4 } from "@/lib/frontend/format";
import { Priority1Simulator } from "@/components/priority1/priority1-simulator";
import { Priority1QuoteResultPanel } from "@/components/priority1/priority1-quote-result-panel";
import type { Priority1ShipmentSummary } from "@/components/priority1/priority1-ftl-schedule-calendar";

export interface Priority1QuoteWidgetProps {
  serviceToken?: string;
  customerId: string;
  apiBaseUrl?: string;
}

function toShipmentSummary(input: Priority1DemoInput): Priority1ShipmentSummary {
  const weight = Number(input.weightLb);
  return {
    originZip: input.originZip,
    destinationZip: input.destinationZip,
    pickupDate: input.pickupDate,
    weightLb: Number.isFinite(weight) && weight > 0 ? weight : undefined,
    itemsLabel:
      input.shipmentType === "ltl" ? input.packaging : input.commodity,
  };
}

function shipmentFromQuote(
  quote: QuoteDetail,
  fallback?: Priority1ShipmentSummary,
): Priority1ShipmentSummary | undefined {
  const meta = quote.priority1?.shipment_meta;
  if (!meta?.origin_zip || !meta.destination_zip) {
    return fallback;
  }
  return {
    originZip: meta.origin_zip,
    destinationZip: meta.destination_zip,
    pickupDate: meta.pickup_date ?? fallback?.pickupDate ?? "",
    weightLb: meta.weight_lb ?? fallback?.weightLb,
    itemsLabel: meta.commodity ?? fallback?.itemsLabel,
  };
}

/** Priority1 模拟填表 + RPA 真实询价 */
export function Priority1QuoteWidget({
  serviceToken,
  customerId,
  apiBaseUrl = "",
}: Priority1QuoteWidgetProps) {
  const [status, setStatus] = useState<QuotePageStatus>("idle");
  const [quote, setQuote] = useState<QuoteDetail | null>(null);
  const [error, setError] = useState<string | null>(null);
  const [submitLocked, setSubmitLocked] = useState(false);
  const [lastInput, setLastInput] = useState<Priority1DemoInput | null>(null);

  const reset = useCallback(() => {
    setStatus("idle");
    setQuote(null);
    setError(null);
  }, []);

  const finishQuote = useCallback((detail: QuoteDetail) => {
    setQuote(detail);
    if (detail.status === "failed") {
      setStatus("error");
      setError(
        resolvePriority1UserMessage(
          detail.error_code,
          detail.error_message ??
            formatQuoteErrorMessage(detail.error_code),
        ),
      );
      return;
    }
    if (detail.status === "expired") {
      setStatus("expired");
      return;
    }
    if (isPriority1ManualFollowupDetail(detail)) {
      setStatus("manual_followup");
      setError(null);
      return;
    }
    setStatus(detail.is_realtime === false ? "fallback" : "success");
    setError(null);
  }, []);

  const handleSubmit = useCallback(
    async (input: Priority1DemoInput) => {
      if (submitLocked) return;
      setSubmitLocked(true);
      setTimeout(() => setSubmitLocked(false), SUBMIT_LOCK_MS);

      setLastInput(input);
      setStatus("validating");
      setError(null);

      const created = await hostCreatePriority1Quote(
        apiBaseUrl,
        serviceToken,
        {
          request_id: uuidV4(),
          customer_id: customerId,
          priority1_input: input,
        },
      );

      if (created.code !== 0) {
        setStatus("error");
        setError(resolvePriority1UserMessage(created.code, created.message));
        return;
      }

      const { quote_id } = created.data;
      setStatus("processing");

      const pollResult = await pollQuoteUntilDone(
        async () => {
          try {
            const res = await hostGetQuote(
              apiBaseUrl,
              serviceToken,
              customerId,
              quote_id,
            );
            if (res.code !== 0) {
              return { ok: false, errorMessage: res.message };
            }
            return { ok: true, data: res.data };
          } catch {
            return { ok: false };
          }
        },
        {
          fastAfterMs: 5_000,
          fastIntervalMs: 600,
        },
      );

      if (pollResult.type === "done") {
        finishQuote(pollResult.quote);
        return;
      }

      setStatus("error");
      setError(
        pollResult.type === "timeout"
          ? "Priority1 询价超时，请稍后重试"
          : resolvePriority1UserMessage("INTERNAL_ERROR", pollResult.message),
      );
    },
    [
      apiBaseUrl,
      serviceToken,
      customerId,
      submitLocked,
      finishQuote,
    ],
  );

  const formDisabled =
    status === "validating" ||
    status === "processing" ||
    submitLocked;

  const shipmentContext = useMemo(() => {
    if (quote) {
      return shipmentFromQuote(
        quote,
        lastInput ? toShipmentSummary(lastInput) : undefined,
      );
    }
    return lastInput ? toShipmentSummary(lastInput) : undefined;
  }, [quote, lastInput]);

  const showWideResult =
    quote?.priority1?.display_mode === "ftl_calendar" &&
    quote.priority1.lines.length > 0;

  return (
    <div className="grid gap-6">
      <div className={showWideResult ? "" : "lg:grid lg:grid-cols-5 lg:gap-6"}>
        <div className={showWideResult ? "" : "lg:col-span-3"}>
          <p className="mb-3 text-sm text-text-secondary">
            按 Priority1 流程填写；第 1 步底部点击「获取即时报价」进入第 2 步，再次点击将提交真实询价。
          </p>
          <Priority1Simulator
            disabled={formDisabled}
            loading={status === "validating" || status === "processing"}
            onSubmit={(input) => void handleSubmit(input)}
          />
        </div>
        {!showWideResult ? (
          <div className="mt-6 lg:col-span-2 lg:mt-0">
            <Priority1QuoteResultPanel
              quote={quote}
              loading={status === "validating" || status === "processing"}
              error={
                status === "error"
                  ? error?.trim() || "Priority1 询价失败，请稍后重试"
                  : null
              }
              shipmentContext={shipmentContext}
              onRequestNewQuote={reset}
            />
          </div>
        ) : null}
      </div>
      {showWideResult ? (
        <Priority1QuoteResultPanel
          quote={quote}
          loading={status === "validating" || status === "processing"}
          error={
            status === "error"
              ? error?.trim() || "Priority1 询价失败，请稍后重试"
              : null
          }
          shipmentContext={shipmentContext}
          onRequestNewQuote={reset}
        />
      ) : null}
    </div>
  );
}