"use client";

import { FormEvent, useMemo, useState } from "react";
import { PrototypeSummary } from "@/lib/prototype";

interface AddPrototypeModalProps {
  onCreated: (item: PrototypeSummary) => void;
}

type UploadState = "idle" | "submitting";

export function AddPrototypeModal({ onCreated }: AddPrototypeModalProps) {
  const [open, setOpen] = useState(false);
  const [uploadState, setUploadState] = useState<UploadState>("idle");
  const [error, setError] = useState<string>("");

  const [name, setName] = useState("");
  const [description, setDescription] = useState("");
  const [file, setFile] = useState<File | null>(null);

  const canSubmit = useMemo(() => {
    return uploadState !== "submitting" && name.trim().length > 0 && Boolean(file);
  }, [uploadState, name, file]);

  const reset = () => {
    setName("");
    setDescription("");
    setFile(null);
    setError("");
    setUploadState("idle");
  };

  const close = () => {
    setOpen(false);
    reset();
  };

  const onSubmit = async (event: FormEvent<HTMLFormElement>) => {
    event.preventDefault();

    if (!file) {
      setError("请选择 ZIP 文件");
      return;
    }

    try {
      setUploadState("submitting");
      setError("");

      const formData = new FormData();
      formData.append("name", name.trim());
      formData.append("description", description.trim());
      formData.append("file", file);

      const response = await fetch("/api/prototypes", {
        method: "POST",
        body: formData,
      });

      const payload = await response.json();

      if (!response.ok) {
        throw new Error(payload.error || "上传失败");
      }

      onCreated(payload.data as PrototypeSummary);
      close();
    } catch (submitError) {
      setError(submitError instanceof Error ? submitError.message : "上传失败");
      setUploadState("idle");
    }
  };

  return (
    <>
      <button
        type="button"
        onClick={() => setOpen(true)}
        className="rounded-xl bg-sky-600 px-4 py-2.5 text-sm font-semibold text-white transition hover:bg-sky-700"
      >
        添加原型
      </button>

      {open ? (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/45 p-4">
          <div className="w-full max-w-xl rounded-2xl border border-slate-200 bg-white p-6 shadow-xl dark:border-slate-700 dark:bg-slate-900">
            <div className="mb-4 flex items-center justify-between">
              <h2 className="text-xl font-semibold text-slate-900 dark:text-slate-100">上传 Axure 原型</h2>
              <button
                type="button"
                onClick={close}
                className="rounded-md px-2 py-1 text-slate-500 transition hover:bg-slate-100 dark:hover:bg-slate-800"
              >
                ✕
              </button>
            </div>

            <form className="space-y-4" onSubmit={onSubmit}>
              <label className="block space-y-1">
                <span className="text-sm text-slate-700 dark:text-slate-300">原型名称 *</span>
                <input
                  type="text"
                  value={name}
                  onChange={(event) => setName(event.target.value)}
                  className="w-full rounded-lg border border-slate-300 px-3 py-2 text-sm outline-none transition focus:border-sky-500 focus:ring-2 focus:ring-sky-200 dark:border-slate-600 dark:bg-slate-800 dark:text-slate-50"
                  placeholder="例如：CRM 完整版"
                  required
                />
              </label>

              <label className="block space-y-1">
                <span className="text-sm text-slate-700 dark:text-slate-300">原型描述</span>
                <textarea
                  rows={3}
                  value={description}
                  onChange={(event) => setDescription(event.target.value)}
                  className="w-full rounded-lg border border-slate-300 px-3 py-2 text-sm outline-none transition focus:border-sky-500 focus:ring-2 focus:ring-sky-200 dark:border-slate-600 dark:bg-slate-800 dark:text-slate-50"
                  placeholder="例如：CRM 项目开发原型"
                />
              </label>

              <label className="block space-y-1">
                <span className="text-sm text-slate-700 dark:text-slate-300">ZIP 文件 *</span>
                <input
                  type="file"
                  accept=".zip,application/zip,application/x-zip-compressed"
                  onChange={(event) => setFile(event.target.files?.[0] ?? null)}
                  className="block w-full text-sm text-slate-600 file:mr-4 file:rounded-md file:border-0 file:bg-sky-50 file:px-3 file:py-2 file:text-sm file:font-medium file:text-sky-700 hover:file:bg-sky-100 dark:text-slate-300 dark:file:bg-sky-500/20 dark:file:text-sky-200"
                  required
                />
                <p className="text-xs text-slate-500 dark:text-slate-400">ZIP 内必须包含 start.html 与 Axure 资源文件。</p>
              </label>

              {error ? (
                <div className="rounded-lg border border-red-200 bg-red-50 px-3 py-2 text-sm text-red-600 dark:border-red-900 dark:bg-red-950/30 dark:text-red-300">
                  {error}
                </div>
              ) : null}

              <div className="flex justify-end gap-3 pt-2">
                <button
                  type="button"
                  onClick={close}
                  className="rounded-lg border border-slate-300 px-4 py-2 text-sm text-slate-700 transition hover:bg-slate-100 dark:border-slate-600 dark:text-slate-200 dark:hover:bg-slate-800"
                >
                  取消
                </button>
                <button
                  type="submit"
                  disabled={!canSubmit}
                  className="rounded-lg bg-sky-600 px-4 py-2 text-sm font-medium text-white transition hover:bg-sky-700 disabled:cursor-not-allowed disabled:opacity-50"
                >
                  {uploadState === "submitting" ? "上传中..." : "确认上传"}
                </button>
              </div>
            </form>
          </div>
        </div>
      ) : null}
    </>
  );
}