import {
  Check,
  ChevronDown,
  CloudDownload,
  LoaderCircle,
  Search,
  Waypoints,
} from "lucide-react";
import { useEffect, useRef } from "react";

import { formatBytes, shortSha } from "../lib/format";
import type { LoadProgress, TokenizerMetadata } from "../tokenizer/types";

interface ModelPickerProps {
  open: boolean;
  reference: string;
  metadata: TokenizerMetadata | null;
  progress: LoadProgress | null;
  loading: boolean;
  onOpenChange: (open: boolean) => void;
  onReferenceChange: (value: string) => void;
  onLoad: () => void;
}

const SUGGESTIONS = [
  { name: "Qwen 3.8", repo: "Qwen/Qwen3.8-2.4T-A95B", format: "Tokenizers" },
  { name: "GLM 5.3 Flash", repo: "zai-org/GLM-5.3-Flash", format: "Tokenizers" },
  { name: "Kimi K3", repo: "moonshotai/Kimi-K3", format: "Tiktoken" },
  {
    name: "DeepSeek V4 Pro",
    repo: "deepseek-ai/DeepSeek-V4-Pro-0813",
    format: "Tokenizers",
  },
  { name: "Gemma 4", repo: "google/gemma-4-31B-it", format: "Tokenizers" },
  {
    name: "Muse Glimmer",
    repo: "meta-models/Muse-Glimmer-30B",
    format: "Tokenizers",
  },
  {
    name: "Mistral Small 4",
    repo: "mistralai/Mistral-Small-4-119B-2603",
    format: "Tokenizers",
  },
  { name: "GPT-OSS", repo: "openai/gpt-oss-20b", format: "Tokenizers" },
];

function modelName(reference: string, metadata: TokenizerMetadata | null): string {
  const repo = metadata?.repoId ?? reference.split("@")[0] ?? reference;
  return repo.split("/").at(-1) || "选择模型";
}

export function ModelPicker({
  open,
  reference,
  metadata,
  progress,
  loading,
  onOpenChange,
  onReferenceChange,
  onLoad,
}: ModelPickerProps) {
  const containerRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    if (!open) return;
    const closeOnOutsideClick = (event: PointerEvent) => {
      if (!containerRef.current?.contains(event.target as Node)) onOpenChange(false);
    };
    const closeOnEscape = (event: KeyboardEvent) => {
      if (event.key === "Escape") onOpenChange(false);
    };
    document.addEventListener("pointerdown", closeOnOutsideClick);
    document.addEventListener("keydown", closeOnEscape);
    return () => {
      document.removeEventListener("pointerdown", closeOnOutsideClick);
      document.removeEventListener("keydown", closeOnEscape);
    };
  }, [open, onOpenChange]);

  const percent =
    progress?.total && progress.total > 0
      ? Math.min(100, (progress.loaded / progress.total) * 100)
      : null;

  return (
    <div className="relative min-w-0" ref={containerRef}>
      <span className="toolbar-label">Model</span>
      <button
        className="toolbar-control w-[min(19rem,72vw)] justify-between"
        type="button"
        aria-expanded={open}
        onClick={() => onOpenChange(!open)}
      >
        <span className="flex min-w-0 items-center gap-2.5">
          {loading ? (
            <LoaderCircle className="shrink-0 animate-spin text-[var(--accent)]" size={17} />
          ) : (
            <Waypoints className="shrink-0 text-[var(--accent)]" size={17} />
          )}
          <span className="truncate">{modelName(reference, metadata)}</span>
        </span>
        <ChevronDown
          className={`shrink-0 text-[var(--muted)] transition-transform ${open ? "rotate-180" : ""}`}
          size={16}
        />
      </button>

      {open ? (
        <div className="popover-panel absolute right-0 top-[calc(100%+10px)] z-30 w-[min(27rem,calc(100vw-2rem))] p-3">
          <form
            className="border-b border-[var(--line)] p-2 pb-4"
            onSubmit={(event) => {
              event.preventDefault();
              onLoad();
            }}
          >
            <label className="field-label" htmlFor="model-reference">
              Hugging Face 仓库
            </label>
            <div className="relative mt-2">
              <Search
                className="pointer-events-none absolute left-3 top-1/2 -translate-y-1/2 text-[var(--muted)]"
                size={15}
                aria-hidden="true"
              />
              <input
                id="model-reference"
                className="text-field py-3 pl-9 pr-24 font-mono text-[12px]"
                value={reference}
                onChange={(event) => onReferenceChange(event.target.value)}
                placeholder="owner/model@revision"
                spellCheck={false}
                autoComplete="off"
              />
              <button
                className="primary-button absolute bottom-1.5 right-1.5 top-1.5 px-3"
                type="submit"
                disabled={loading || !reference.trim()}
              >
                {loading ? <LoaderCircle className="animate-spin" size={14} /> : <CloudDownload size={14} />}
                加载
              </button>
            </div>
            <p className="mt-2 text-[10px] leading-4 text-[var(--muted)]">
              使用 <code>@revision</code> 可以固定模型版本。
            </p>
          </form>

          {loading && progress ? (
            <div className="m-2 rounded-xl bg-[var(--soft)] p-3" role="status">
              <div className="flex items-center justify-between gap-3 text-[11px]">
                <span className="text-[var(--muted-strong)]">{progress.message}</span>
                <span className="font-mono text-[var(--muted)]">
                  {progress.total ? `${Math.round(percent ?? 0)}%` : "•••"}
                </span>
              </div>
              <div className="mt-2 h-1 overflow-hidden rounded-full bg-[var(--line-strong)]">
                <div
                  className={`h-full rounded-full bg-[var(--accent)] ${percent === null ? "w-1/3 animate-[loading_1.4s_ease-in-out_infinite]" : ""}`}
                  style={percent === null ? undefined : { width: `${percent}%` }}
                />
              </div>
            </div>
          ) : null}

          <div className="max-h-[min(26rem,50vh)] space-y-1 overflow-y-auto p-2 pt-3">
            <p className="mb-2 px-2 text-[9px] font-bold uppercase tracking-[0.18em] text-[var(--muted)]">
              Quick access
            </p>
            {SUGGESTIONS.map((suggestion) => {
              const selected = metadata?.repoId === suggestion.repo;
              return (
                <button
                  className="model-option"
                  type="button"
                  key={suggestion.repo}
                  onClick={() => onReferenceChange(suggestion.repo)}
                >
                  <span className="grid size-8 shrink-0 place-items-center rounded-lg border border-[var(--line)] bg-[var(--soft)] text-[var(--accent)]">
                    <Waypoints size={15} />
                  </span>
                  <span className="min-w-0 flex-1 text-left">
                    <span className="block truncate text-xs font-semibold text-[var(--ink)]">
                      {suggestion.name}
                    </span>
                    <span className="mt-0.5 block truncate font-mono text-[9px] text-[var(--muted)]">
                      {suggestion.format} · {suggestion.repo}
                    </span>
                  </span>
                  {selected ? <Check className="text-[var(--accent)]" size={15} /> : null}
                </button>
              );
            })}
          </div>

          {metadata ? (
            <div className="mx-2 mb-2 flex items-center justify-between gap-3 rounded-xl border border-[var(--line)] bg-[var(--soft)] px-3 py-2 text-[9px] text-[var(--muted)]">
              <span>{metadata.format} · {formatBytes(metadata.fileSize)}</span>
              <span className="font-mono">{shortSha(metadata.commitSha)}</span>
            </div>
          ) : null}
        </div>
      ) : null}
    </div>
  );
}