"use client";

import Link from "next/link";
import { useRouter } from "next/navigation";
import { startTransition, useState } from "react";

export function BindDeviceForm() {
  const router = useRouter();
  const [rawCode, setRawCode] = useState("");
  const [submitting, setSubmitting] = useState(false);
  const [notice, setNotice] = useState<string | null>(null);

  async function handleSubmit(event: React.FormEvent<HTMLFormElement>) {
    event.preventDefault();

    if (!rawCode.trim()) {
      setNotice("先把老人二维码里的设备码贴进来。\n");
      return;
    }

    setSubmitting(true);
    setNotice("正在建立连接，请稍候……");

    try {
      const response = await fetch("/api/family/bind", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({ deviceUuid: rawCode }),
      });

      const payload = (await response.json().catch(() => null)) as
        | { error?: string }
        | null;

      if (!response.ok) {
        throw new Error(payload?.error || "连接失败，请稍后再试。");
      }

      setNotice("已经连上了，这位老人的留言和陪伴记录会出现在下方。\n");
      setRawCode("");
      startTransition(() => {
        router.refresh();
      });
    } catch (error) {
      setNotice(
        error instanceof Error ? error.message : "连接失败，请稍后再试。",
      );
    } finally {
      setSubmitting(false);
    }
  }

  return (
    <div className="rounded-[28px] border border-white/70 bg-white/80 p-5 shadow-[0_24px_60px_rgba(125,80,46,0.12)] backdrop-blur">
      <div className="flex flex-col gap-3 lg:flex-row lg:items-end lg:justify-between">
        <div className="max-w-xl">
          <p className="text-sm font-medium tracking-[0.18em] text-[var(--copper)] uppercase">
            家人连接
          </p>
          <h3 className="mt-2 font-[family-name:var(--font-display)] text-2xl text-[var(--ink)]">
            扫二维码，或者直接贴入设备码
          </h3>
          <p className="mt-2 text-sm leading-7 text-[var(--muted)]">
            如果老人已经把二维码发给您，直接扫码最快；如果您拿到的是一段链接或设备码，也可以贴到下面。
          </p>
        </div>
        <Link
          href="/scan"
          className="inline-flex h-12 items-center justify-center rounded-full bg-[var(--copper)] px-5 text-sm font-semibold text-white transition hover:bg-[var(--copper-deep)]"
        >
          打开扫码页
        </Link>
      </div>

      <form className="mt-5 flex flex-col gap-3 lg:flex-row" onSubmit={handleSubmit}>
        <input
          value={rawCode}
          onChange={(event) => setRawCode(event.target.value)}
          placeholder="粘贴二维码链接，或者直接贴设备 UUID"
          className="h-13 flex-1 rounded-full border border-[var(--line)] bg-[var(--paper-soft)] px-5 text-sm text-[var(--ink)] outline-none transition focus:border-[var(--copper)] focus:bg-white"
        />
        <button
          type="submit"
          disabled={submitting}
          className="inline-flex h-13 min-w-36 items-center justify-center rounded-full bg-[var(--olive)] px-5 text-sm font-semibold text-white transition hover:bg-[var(--olive-deep)] disabled:cursor-not-allowed disabled:opacity-60"
        >
          {submitting ? "正在连接" : "立即绑定"}
        </button>
      </form>

      {notice ? (
        <p className="mt-3 whitespace-pre-line text-sm leading-7 text-[var(--muted)]">
          {notice}
        </p>
      ) : null}
    </div>
  );
}

type SendMessageFormProps = {
  deviceUuid: string;
};

export function SendMessageForm({ deviceUuid }: SendMessageFormProps) {
  const router = useRouter();
  const [content, setContent] = useState("");
  const [importance, setImportance] = useState("NORMAL");
  const [submitting, setSubmitting] = useState(false);
  const [notice, setNotice] = useState<string | null>(null);
  const [createdMessagePublicId, setCreatedMessagePublicId] = useState<number | null>(null);

  async function handleSubmit(event: React.FormEvent<HTMLFormElement>) {
    event.preventDefault();

    if (!content.trim()) {
      setNotice("先写下想对老人说的话。\n");
      setCreatedMessagePublicId(null);
      return;
    }

    setSubmitting(true);
    setNotice("正在送达这条留言……");

    try {
      const response = await fetch("/api/family/messages", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          deviceUuid,
          content,
          importance,
        }),
      });

      const payload = (await response.json().catch(() => null)) as
        | { error?: string; publicId?: number }
        | null;

      if (!response.ok) {
        throw new Error(payload?.error || "留言发送失败，请稍后再试。");
      }

      setNotice("留言已经写进家人的收件盒，老人下次打开或询问时就能看到。\n");
      setCreatedMessagePublicId(
        typeof payload?.publicId === "number" ? payload.publicId : null,
      );
      setContent("");
      setImportance("NORMAL");
      startTransition(() => {
        router.refresh();
      });
    } catch (error) {
      setCreatedMessagePublicId(null);
      setNotice(
        error instanceof Error ? error.message : "留言发送失败，请稍后再试。",
      );
    } finally {
      setSubmitting(false);
    }
  }

  return (
    <form className="rounded-[28px] border border-white/70 bg-white/88 p-5" onSubmit={handleSubmit}>
      <div className="flex items-center justify-between gap-3">
        <div>
          <p className="text-sm font-medium tracking-[0.18em] text-[var(--copper)] uppercase">
            给老人留句话
          </p>
          <h4 className="mt-2 font-[family-name:var(--font-display)] text-xl text-[var(--ink)]">
            写一句今天就能被看到的问候
          </h4>
        </div>
        <select
          value={importance}
          onChange={(event) => setImportance(event.target.value)}
          className="h-11 rounded-full border border-[var(--line)] bg-[var(--paper-soft)] px-4 text-sm text-[var(--ink)] outline-none"
        >
          <option value="LOW">温和提醒</option>
          <option value="NORMAL">日常问候</option>
          <option value="HIGH">希望尽快看到</option>
          <option value="URGENT">需要尽快联系</option>
        </select>
      </div>

      <textarea
        value={content}
        onChange={(event) => setContent(event.target.value)}
        rows={4}
        placeholder="例如：妈，晚上天气凉，记得添件衣服。晚饭后我给您打电话。"
        className="mt-4 w-full rounded-[24px] border border-[var(--line)] bg-[var(--paper-soft)] px-4 py-4 text-sm leading-7 text-[var(--ink)] outline-none transition focus:border-[var(--copper)] focus:bg-white"
      />

      <div className="mt-4 flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
        <p className="text-sm leading-7 text-[var(--muted)]">
          这条话会进入老人的留言列表，也会被 function calling 工具读取到。
        </p>
        <button
          type="submit"
          disabled={submitting}
          className="inline-flex h-12 min-w-32 items-center justify-center rounded-full bg-[var(--ink)] px-5 text-sm font-semibold text-white transition hover:bg-[var(--ink-soft)] disabled:cursor-not-allowed disabled:opacity-60"
        >
          {submitting ? "正在送达" : "写好并送出"}
        </button>
      </div>

      {notice ? (
        <div className="mt-3 space-y-2 text-sm leading-7 text-[var(--muted)]">
          <p className="whitespace-pre-line">{notice}</p>
          {createdMessagePublicId ? (
            <Link
              href={`/messages/${createdMessagePublicId}`}
              className="inline-flex h-10 items-center justify-center rounded-full border border-[var(--line)] bg-white px-4 font-semibold text-[var(--ink)] transition hover:bg-[var(--paper-soft)]"
            >
              打开留言 #{createdMessagePublicId}
            </Link>
          ) : null}
        </div>
      ) : null}
    </form>
  );
}