"use client";
import { useEffect, useRef, useState } from "react";
import {
  ArrowUp,
  Check,
  ChevronDown,
  Maximize2,
  Play,
  Plus,
  Scissors,
  Upload,
  X,
} from "lucide-react";
import {
  editRatios,
  editResolutions,
  planTimeline,
  editableCaptions,
  SECOND,
  type EditPlan,
} from "@/lib/video-canvas/smart-edit/contract";
import { resolveSmartEditIntent, assertBeatMusic } from "@/lib/video-canvas/smart-edit/intent";
import styles from "./SmartEditNode.module.css";
export type SmartEditSource = { id: string; name: string; url: string; duration?: number };
export type SmartEditMode = "explain" | "ads" | "talk" | "montage";
const modes = [
  { id: "auto", name: "默认模式" },
  { id: "explain", name: "讲解视频" },
  { id: "ads", name: "批量广告" },
  { id: "talk", name: "口播视频" },
  { id: "montage", name: "素材混剪" },
];
export function SmartEditNodeCard({
  title,
  previewUrl,
  plan,
  onOpen,
  onMode,
  selected = false,
}: {
  title: string;
  selected?: boolean;
  previewUrl?: string;
  plan?: EditPlan;
  onOpen: () => void;
  onMode?: (mode: SmartEditMode) => void;
}) {
  let timeline: ReturnType<typeof planTimeline> | undefined;
  try {
    if (plan) timeline = planTimeline(plan);
  } catch {
    /* Invalid saved drafts open in the editor for recovery. */
  }
  const length = timeline?.duration || 0,
    tick = Math.max(1, Math.ceil(length / SECOND / 5));
  const empty = !timeline && !previewUrl;
  return (
    <div className={`${styles.card} ${empty ? styles.emptyCard : ""}`} style={{ borderColor: selected ? "#888" : "#454545" }}>
      <div className={styles.title}>
        <Play size={12} fill="currentColor" />
        {title}
      </div>
      <div className={styles.preview}>
        {previewUrl && <video src={`${previewUrl}#t=0.1`} muted preload="metadata" />}
        <div className={styles.open}>
          <Scissors size={36} />
          {empty ? (
            <span>空空如也，请连接视频节点后操作</span>
          ) : (
            <button onPointerDown={(e) => e.stopPropagation()} onClick={onOpen}>
              打开智能剪辑
            </button>
          )}
        </div>
      </div>
      {empty ? (
        <div className={styles.emptyActions}>
          <span>尝试：</span>
          {([
            ["explain", "讲解视频"],
            ["ads", "批量广告"],
            ["talk", "口播视频"],
            ["montage", "素材混剪"],
          ] as const).map(([mode, label]) => (
            <button key={mode} onPointerDown={(e) => e.stopPropagation()} onClick={() => onMode?.(mode)} type="button">{label}</button>
          ))}
        </div>
      ) : null}
      {!empty ? <>
      <div className={styles.ruler} aria-label="剪辑时间刻度">
        {timeline ? (
          Array.from({ length: Math.floor(length / SECOND / tick) + 1 }, (_, i) => {
            const seconds = i * tick;
            return (
              <span key={i}>
                {Math.floor(seconds / 60)}:{String(seconds % 60).padStart(2, "0")}
              </span>
            );
          })
        ) : (
          <span>尚未生成时间轴</span>
        )}
      </div>
      <div className={styles.tracks} aria-label="剪辑时间轴缩略图">
        {timeline && (
          <>
            <div>
              {timeline.clips.map((clip) => (
                <i
                  key={clip.id}
                  title={clip.label}
                  style={{
                    left: `${(clip.start / length) * 100}%`,
                    width: `${(clip.duration / length) * 100}%`,
                  }}
                />
              ))}
            </div>
            {!!timeline.audioClips.length && (
              <div>
                {timeline.audioClips.map((clip) => (
                  <i
                    key={clip.id}
                    style={{
                      left: `${(clip.start / length) * 100}%`,
                      width: `${(clip.duration / length) * 100}%`,
                      background: "#346752",
                    }}
                  />
                ))}
              </div>
            )}
            {plan?.subtitles && (
              <div>
                {editableCaptions(plan).map((caption) => (
                  <i
                    key={caption.id}
                    title={caption.text}
                    style={{
                      left: `${(caption.start / length) * 100}%`,
                      width: `${((caption.end - caption.start) / length) * 100}%`,
                      background: "#75602e",
                    }}
                  />
                ))}
              </div>
            )}
          </>
        )}
      </div>
      </> : null}
    </div>
  );
}
export function SmartEditNodeComposer({
  anchor,
  draft,
  sources,
  availableSources,
  availableAudios = [],
  onDraft,
  onAddSource,
  onRemoveSource,
  onUpload,
  onReference,
  onSubmit,
  busy,
}: {
  anchor: { centerX: number; bottomY: number; zoom: number };
  draft: Record<string, any>;
  sources: SmartEditSource[];
  availableSources: SmartEditSource[];
  availableAudios?: { name: string; url: string }[];
  onDraft: (patch: Record<string, unknown>) => void;
  onAddSource: (id: string) => void;
  onRemoveSource: (id: string) => void;
  onUpload: (files: File[]) => void;
  onReference?: () => void;
  onSubmit: () => Promise<unknown>;
  busy: boolean;
}) {
  const [menu, setMenu] = useState<"mode" | "settings" | "sources" | null>(null),
    [expanded, setExpanded] = useState(false),
    [error, setError] = useState(""),
    [submitting, setSubmitting] = useState(false);
  useEffect(() => setError(""), [draft.music?.url, draft.beatSync]);
  const root = useRef<HTMLDivElement>(null),
    file = useRef<HTMLInputElement>(null),
    musicFile = useRef<HTMLInputElement>(null);
  useEffect(() => {
    const close = (e: PointerEvent) => {
      if (!root.current?.contains(e.target as Node)) setMenu(null);
    };
    document.addEventListener("pointerdown", close);
    return () => document.removeEventListener("pointerdown", close);
  }, []);
  const ratio = draft.ratio || "16:9",
    resolution = draft.resolution || "720p",
    duration = draft.targetDuration ?? 30,
    mode = modes.find((m) => m.id === draft.mode) || modes[0];
  const toggle = (value: typeof menu) => setMenu(menu === value ? null : value);
  return (
    <div
      ref={root}
      className={styles.composer}
      style={{ left: anchor.centerX, top: anchor.bottomY + 16 * anchor.zoom }}
      onPointerDown={(e) => e.stopPropagation()}
      onWheel={(e) => e.stopPropagation()}
      onKeyDown={(e) => e.stopPropagation()}
    >
      <div className={styles.referenceRow}>
        <button
          onClick={() => (onReference ? onReference() : toggle("sources"))}
          onContextMenu={(e) => {
            e.preventDefault();
            toggle("sources");
          }}
        >
          <Plus size={14} />
          参考
        </button>
        <button
          aria-label={expanded ? "收起输入框" : "展开输入框"}
          onClick={() => setExpanded(!expanded)}
        >
          <Maximize2 size={16} />
        </button>
      </div>
      {!!sources.length && (
        <div className={styles.sources}>
          {sources.map((s, i) => (
            <div className={styles.source} key={s.id} title={s.name}>
              <video src={`${s.url}#t=0.1`} preload="metadata" muted />
              <b>{i + 1}</b>
              <Play size={12} fill="white" />
              <span>{s.duration ? `${s.duration.toFixed(1)}s` : "视频"}</span>
              <button aria-label={`移除 ${s.name}`} onClick={() => onRemoveSource(s.id)}>
                <X size={10} />
              </button>
            </div>
          ))}
        </div>
      )}
      <input
        ref={musicFile}
        hidden
        type="file"
        accept="audio/*"
        onChange={async (e) => {
          const file = e.target.files?.[0];
          e.target.value = "";
          if (!file) return;
          if (file.size > 125 * 1024 * 1024) {
            setError("单个素材不得超过 125 MiB");
            return;
          }
          setSubmitting(true);
          setError("");
          try {
            const body = new FormData();
            body.append("file", file);
            let response: Response;
            try {
              response = await fetch("/api/canvas/media/upload", {
                method: "POST",
                body,
                signal: AbortSignal.timeout(600000),
              });
            } catch (e) {
              throw new Error(
                e instanceof DOMException && (e.name === "TimeoutError" || e.name === "AbortError")
                  ? "上传超时，请检查网络后重试，或改用更小的素材"
                  : "上传失败，请检查网络后重试",
              );
            }
            const data = await response.json(),
              url = data.url || data.data?.url;
            if (!response.ok || !url) throw new Error(data.error || "音乐上传失败");
            onDraft({ music: { url, gain: 0.2, start: 0 } });
          } catch (e) {
            setError(e instanceof Error ? e.message : "音乐上传失败");
          } finally {
            setSubmitting(false);
          }
        }}
      />
      <textarea
        aria-label="智能剪辑要求"
        placeholder="描述你想要的剪辑效果"
        value={draft.prompt || ""}
        onChange={(e) => onDraft({ prompt: e.target.value })}
        style={{ height: expanded ? 192 : 96 }}
      />
      <div className={styles.controls}>
        <button className={styles.mode} onClick={() => toggle("mode")}>
          {mode.name}
          <ChevronDown size={12} />
        </button>
        <button className={styles.parameters} onClick={() => toggle("settings")}>
          {ratio} · {String(resolution).toUpperCase()} · {duration ? `${duration}s` : "自动"}
          <ChevronDown size={12} />
        </button>
        <button
          className={styles.send}
          disabled={busy || submitting || sources.length === 0}
          aria-label="发送"
          onClick={async () => {
            setError("");
            setSubmitting(true);
            try {
              assertBeatMusic(resolveSmartEditIntent(draft));
              await onSubmit();
            } catch (e) {
              setError(e instanceof Error ? e.message : "提交失败");
            } finally {
              setSubmitting(false);
            }
          }}
        >
          <ArrowUp size={20} />
        </button>
      </div>
      {error && (
        <div role="alert" className={styles.error}>
          {error}
        </div>
      )}
      {menu === "mode" && (
        <div className={`${styles.popup} ${styles.modeMenu}`}>
          {modes.map((m) => (
            <button
              key={m.id}
              onClick={() => {
                onDraft({ mode: m.id });
                setMenu(null);
              }}
            >
              {m.name}
              {m.id === mode.id && <Check size={14} />}
            </button>
          ))}
        </div>
      )}
      {menu === "settings" && (
        <div className={`${styles.popup} ${styles.settings}`}>
          <label>比例</label>
          <div className={styles.ratios}>
            {editRatios.map((r) => {
              const [w, h] = r.split(":").map(Number);
              return (
                <button
                  key={r}
                  aria-pressed={r === ratio}
                  onClick={() => onDraft({ ratio: r })}
                >
                  <i
                    style={{
                      width: Math.min(16, (16 * w) / h),
                      height: Math.min(16, (16 * h) / w),
                    }}
                  />
                  {r}
                </button>
              );
            })}
          </div>
          <label htmlFor="smart-edit-duration">时长</label>
          <div className={styles.duration}>
            <input
              aria-label="目标时长"
              type="range"
              min={0}
              max={300}
              step={1}
              value={duration}
              onChange={(e) => onDraft({ targetDuration: Number(e.target.value) })}
            />
            <input
              id="smart-edit-duration"
              type="number"
              min={0}
              max={300}
              value={duration}
              onChange={(e) =>
                onDraft({ targetDuration: Math.max(0, Math.min(300, Number(e.target.value))) })
              }
            />
            <span>s</span>
          </div>
          {mode.id === "ads" && (
            <>
              <label>广告版本</label>
              <div className={styles.resolutions}>
                {[1, 2, 3].map((count) => (
                  <button
                    key={count}
                    aria-pressed={(draft.variants ?? 3) === count}
                    onClick={() => onDraft({ variants: count })}
                  >
                    {count} 版
                  </button>
                ))}
              </div>
            </>
          )}
          <details className={styles.musicDetails}>
            <summary>背景音乐与卡点</summary>
          <label htmlFor="smart-edit-music">背景音乐</label>
          <select
            id="smart-edit-music"
            value={draft.music?.url || ""}
            onChange={(e) =>
              onDraft({
                music: e.target.value
                  ? { url: e.target.value, gain: 0.2, start: 0 }
                  : undefined,
              })
            }
          >
            <option value="">未选择</option>
            {draft.music?.url && !availableAudios.some((a) => a.url === draft.music.url) && (
              <option value={draft.music.url}>已上传音乐</option>
            )}
            {availableAudios.map((audio) => (
              <option key={audio.url} value={audio.url}>
                {audio.name}
              </option>
            ))}
          </select>
          <button
            className={styles.musicUpload}
            disabled={submitting}
            onClick={() => musicFile.current?.click()}
          >
            <Upload size={12} />
            上传音乐
          </button>
          <label className={styles.beatToggle}>
            <input
              type="checkbox"
              checked={resolveSmartEditIntent(draft).beatSync}
              onChange={(e) => onDraft({ beatSync: e.target.checked })}
            />
            音乐卡点
          </label>
          {resolveSmartEditIntent(draft).beatSync && (
            <div className={styles.resolutions}>
              {["2", "4"].map((beats) => (
                <button
                  key={beats}
                  aria-pressed={(draft.beatsPerCut || "4") === beats}
                  onClick={() => onDraft({ beatsPerCut: beats })}
                >
                  {beats} 拍切换
                </button>
              ))}
            </div>
          )}
          </details>
          <label>清晰度</label>
          <div className={styles.resolutions}>
            {editResolutions.map((r) => (
              <button
                key={r}
                aria-pressed={r === resolution}
                onClick={() => onDraft({ resolution: r })}
              >
                {r.toUpperCase()}
              </button>
            ))}
          </div>
        </div>
      )}
      {menu === "sources" && (
        <div className={`${styles.popup} ${styles.sourceMenu}`}>
          <button onClick={() => file.current?.click()} disabled={sources.length >= 12}>
            <Upload size={14} />
            上传视频
          </button>
          <div>画布素材 · {sources.length}/12</div>
          {availableSources.map((s) => (
            <button
              key={s.id}
              disabled={sources.length >= 12 && !sources.some((a) => a.id === s.id)}
              onClick={() =>
                sources.some((a) => a.id === s.id) ? onRemoveSource(s.id) : onAddSource(s.id)
              }
            >
              <Play size={14} />
              <span>{s.name}</span>
              {sources.some((a) => a.id === s.id) && <Check size={14} />}
            </button>
          ))}
          {!availableSources.length && <p>上传视频或连接画布视频素材</p>}
        </div>
      )}
      <input
        ref={file}
        type="file"
        hidden
        accept="video/*"
        multiple
        onChange={(e) => {
          onUpload(Array.from(e.target.files || []).slice(0, 12 - sources.length));
          e.target.value = "";
          setMenu(null);
        }}
      />
    </div>
  );
}