"use client";

import { useCallback, useEffect, useState } from "react";
import { Card } from "@/components/ui/card";
import {
  PrimaryButton,
  SecondaryButton,
} from "@/components/ui/primary-button";
import { InputField } from "@/components/ui/input-field";
import { ErrorBanner } from "@/components/ui/error-banner";
import { Skeleton } from "@/components/ui/skeleton";
import { EmbeddedQuoteWidget } from "@/components/embed/embedded-quote-widget";
import {
  embedGetProviderCredentials,
  embedSaveProviderCredential,
  type EmbedProviderCredential,
} from "@/lib/frontend/api-client";

type QuoteProvider = "mothership" | "flock";
type QuoteMode = "anon" | "login";

interface ModuleDef {
  provider: QuoteProvider;
  title: string;
  desc: string;
}

/** 门户仅两模块：MotherShip / Flock（进入后可选免账号或登录后） */
const MODULES: ModuleDef[] = [
  {
    provider: "mothership",
    title: "MotherShip",
    desc: "免账号实时报价，或使用官网账号登录后查价",
  },
  {
    provider: "flock",
    title: "Flock Freight",
    desc: "ZIP Direct 匿名询价，或使用官网账号登录后查价",
  },
];

interface QuoteRouteHubProps {
  customerId: string;
  apiBaseUrl?: string;
}

export function QuoteRouteHub({
  customerId,
  apiBaseUrl = "",
}: QuoteRouteHubProps) {
  const [loading, setLoading] = useState(true);
  const [creds, setCreds] = useState<
    Record<QuoteProvider, EmbedProviderCredential>
  >({
    mothership: {
      provider: "mothership",
      email: null,
      password: null,
      has_password: false,
      updated_at: null,
    },
    flock: {
      provider: "flock",
      email: null,
      password: null,
      has_password: false,
      updated_at: null,
    },
  });
  const [selected, setSelected] = useState<ModuleDef | null>(null);
  const [mode, setMode] = useState<QuoteMode>("anon");

  const loadCreds = useCallback(async () => {
    setLoading(true);
    const res = await embedGetProviderCredentials(apiBaseUrl);
    if (res.code === 0) {
      setCreds((prev) => {
        const next = { ...prev };
        for (const item of res.data.list) {
          if (item.provider === "mothership" || item.provider === "flock") {
            next[item.provider] = item;
          }
        }
        return next;
      });
    }
    setLoading(false);
  }, [apiBaseUrl]);

  useEffect(() => {
    void loadCreds();
  }, [loadCreds]);

  const handleSaved = useCallback((saved: EmbedProviderCredential) => {
    setCreds((prev) => ({ ...prev, [saved.provider]: saved }));
  }, []);

  const openModule = (mod: ModuleDef) => {
    setSelected(mod);
    // 已配置账密时默认进登录后；否则免账号
    setMode(creds[mod.provider].has_password ? "login" : "anon");
  };

  if (loading) {
    return <Skeleton className="h-64 w-full" />;
  }

  if (!selected) {
    return (
      <div className="grid gap-4 sm:grid-cols-2">
        {MODULES.map((mod) => {
          const hasPassword = creds[mod.provider].has_password;
          return (
            <Card
              key={mod.provider}
              className="flex cursor-pointer flex-col gap-2 transition-colors hover:border-primary"
              onClick={() => openModule(mod)}
              data-testid={`quote-route-module-${mod.provider}`}
            >
              <div className="flex items-center justify-between gap-2">
                <span className="text-base font-semibold text-text-primary">
                  {mod.title}
                </span>
                <span
                  className={`shrink-0 rounded-full px-2 py-0.5 text-xs ${
                    hasPassword
                      ? "bg-green-50 text-green-600"
                      : "bg-bg text-text-secondary"
                  }`}
                >
                  {hasPassword ? "已配置官网账号" : "可免账号查价"}
                </span>
              </div>
              <span className="text-sm text-text-secondary">{mod.desc}</span>
            </Card>
          );
        })}
      </div>
    );
  }

  const providerCred = creds[selected.provider];
  const requiresAccount = mode === "login";
  const canQuote = !requiresAccount || providerCred.has_password;

  return (
    <div>
      <div className="mb-4 flex flex-wrap items-center justify-between gap-3">
        <div>
          <p className="text-sm text-text-secondary">当前查价模块</p>
          <p className="text-lg font-semibold text-text-primary">
            {selected.title}
          </p>
        </div>
        <SecondaryButton onClick={() => setSelected(null)}>
          返回模块列表
        </SecondaryButton>
      </div>

      <div className="mb-4 flex flex-wrap gap-1 rounded-md bg-bg p-1">
        {(
          [
            { id: "anon" as const, label: "免账号", desc: "无需官网登录" },
            { id: "login" as const, label: "登录后", desc: "使用官网账密" },
          ] as const
        ).map((tab) => (
          <button
            key={tab.id}
            type="button"
            onClick={() => setMode(tab.id)}
            className={`flex min-w-[40%] flex-1 flex-col items-center rounded-sm px-3 py-2 text-center transition-colors sm:flex-row sm:justify-center sm:gap-2 ${
              mode === tab.id
                ? "bg-surface text-primary shadow-card"
                : "text-text-secondary hover:text-text-primary"
            }`}
          >
            <span className="text-sm font-semibold">{tab.label}</span>
            <span className="text-xs text-text-secondary">{tab.desc}</span>
          </button>
        ))}
      </div>

      {requiresAccount && (
        <ProviderCredentialPanel
          provider={selected.provider}
          apiBaseUrl={apiBaseUrl}
          current={providerCred}
          onSaved={handleSaved}
        />
      )}

      {canQuote ? (
        <EmbeddedQuoteWidget
          key={`${selected.provider}-${mode}`}
          customerId={customerId}
          apiBaseUrl={apiBaseUrl}
          forcedProvider={selected.provider}
          hideProviderSwitch
          mothershipLoggedInUi={
            selected.provider === "mothership" && requiresAccount
          }
          flockLoggedInUi={selected.provider === "flock" && requiresAccount}
        />
      ) : (
        <Card className="mt-4">
          <p className="text-sm text-text-secondary">
            「登录后」查价需先保存承运商账号密码，保存成功后即可开始。
          </p>
        </Card>
      )}
    </div>
  );
}

interface ProviderCredentialPanelProps {
  provider: QuoteProvider;
  apiBaseUrl: string;
  current: EmbedProviderCredential;
  onSaved: (saved: EmbedProviderCredential) => void;
}

function ProviderCredentialPanel({
  provider,
  apiBaseUrl,
  current,
  onSaved,
}: ProviderCredentialPanelProps) {
  const [email, setEmail] = useState(current.email ?? "");
  const [password, setPassword] = useState(current.password ?? "");
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [savedHint, setSavedHint] = useState<string | null>(null);

  useEffect(() => {
    setEmail(current.email ?? "");
    setPassword(current.password ?? "");
    setError(null);
    setSavedHint(null);
  }, [provider, current.email, current.password]);

  const handleSave = async () => {
    if (saving) return;
    if (!email.trim()) {
      setError("请填写登录邮箱");
      return;
    }
    if (!password.trim()) {
      setError("请填写登录密码（明文展示便于核对，修改后请点保存）");
      return;
    }
    setSaving(true);
    setError(null);
    setSavedHint(null);
    const res = await embedSaveProviderCredential(
      apiBaseUrl,
      provider,
      email.trim(),
      password,
    );
    setSaving(false);
    if (res.code !== 0) {
      setError(res.message || "保存失败");
      return;
    }
    setEmail(res.data.email ?? email.trim());
    setPassword(res.data.password ?? password);
    setSavedHint(
      "账号密码已保存。若官网已改密，请确认此处已同步更新后再查价。",
    );
    onSaved(res.data);
  };

  return (
    <Card className="mb-4">
      <h3 className="mb-1 text-base font-semibold text-text-primary">
        承运商账号密码
      </h3>
      <p className="mb-4 text-sm text-text-secondary">
        {current.has_password
          ? "以下为当前已保存的明文账密，请核对是否与官网一致。官网改密后须在此即时保存，否则查价会卡在登录页并报错。"
          : "首次使用请填写官网账号邮箱与密码，保存后方可查价。"}
      </p>
      {error && (
        <div className="mb-4">
          <ErrorBanner>{error}</ErrorBanner>
        </div>
      )}
      {savedHint && (
        <p className="mb-4 text-sm text-green-600">{savedHint}</p>
      )}
      <div className="space-y-4">
        <InputField
          label="登录邮箱"
          name="provider_email"
          placeholder="账号邮箱"
          autoComplete="off"
          value={email}
          disabled={saving}
          onChange={(e) => setEmail(e.target.value)}
        />
        <InputField
          label="登录密码（明文）"
          name="provider_password"
          type="text"
          autoComplete="off"
          placeholder="官网登录密码"
          value={password}
          disabled={saving}
          onChange={(e) => setPassword(e.target.value)}
        />
        <PrimaryButton
          type="button"
          loading={saving}
          onClick={() => void handleSave()}
        >
          {current.has_password ? "保存修改" : "保存"}
        </PrimaryButton>
      </div>
    </Card>
  );
}