import React, { useState, useEffect } from 'react';
import { Sparkles, Sliders, RefreshCw, Send, AlertCircle, ChevronDown, ChevronUp } from 'lucide-react';
import MediaUploader from './MediaUploader';
import { RESOLUTIONS, DURATIONS, STEPS_BY_TURBO, SEED_OPTIONS, DEFAULT_RES, DEFAULT_DUR } from '../constants';
import { createJob } from '../api';
import { useToast } from './Toast';

export default function CreateForm({ initialValues, onCreated }) {
  const { addToast } = useToast();
  const [tab, setTab] = useState('text'); // 'text' | 'fl2va' | 'ref2va'
  const [prompt, setPrompt] = useState('');
  const [resValue, setResValue] = useState(DEFAULT_RES);
  const [durValue, setDurValue] = useState(DEFAULT_DUR);
  const [turbo, setTurbo] = useState(false);
  const [steps, setSteps] = useState('20');
  const [seed, setSeed] = useState('0');
  const [cfgScale, setCfgScale] = useState('');
  const [negativePrompt, setNegativePrompt] = useState('');
  const [showAdvanced, setShowAdvanced] = useState(false);
  const [submitting, setSubmitting] = useState(false);
  const [err, setErr] = useState('');

  // 媒体状态
  const [firstFrame, setFirstFrame] = useState(null);
  const [lastFrame, setLastFrame] = useState(null);
  const [refImages, setRefImages] = useState([]);
  const [refVideos, setRefVideos] = useState([]);
  const [refAudios, setRefAudios] = useState([]);

  // 如果从详情页点了“重跑”，注入初始参数
  useEffect(() => {
    if (!initialValues) return;
    const req = initialValues;
    if (req.first_frame_url || req.last_frame_url) {
      setTab('fl2va');
      setFirstFrame(req.first_frame_url || null);
      setLastFrame(req.last_frame_url || null);
    } else if ((req.reference_image_urls || []).length || (req.reference_video_urls || []).length || (req.reference_audio_urls || []).length) {
      setTab('ref2va');
      setRefImages(req.reference_image_urls || []);
      setRefVideos(req.reference_video_urls || []);
      setRefAudios(req.reference_audio_urls || []);
    } else {
      setTab('text');
    }

    setPrompt(req.prompt || '');
    const matchedRes = RESOLUTIONS.find((r) => r.width === req.width && r.height === req.height);
    if (matchedRes) setResValue(matchedRes.value);

    const matchedDur = DURATIONS.find((d) => d.frames === req.frames);
    if (matchedDur) setDurValue(matchedDur.value);

    const isTurbo = req.turbo === false ? false : true;
    setTurbo(isTurbo);
    if (req.steps != null) setSteps(String(req.steps));
    if (req.seed != null) setSeed(String(req.seed));
    if (req.cfg_scale != null) setCfgScale(String(req.cfg_scale));
    if (req.negative_prompt) setNegativePrompt(req.negative_prompt);
  }, [initialValues]);

  // 分辨率对应的时长合法性校验
  const currentRes = RESOLUTIONS.find((r) => r.value === resValue) || RESOLUTIONS[0];
  const allowedDurations = DURATIONS.filter((d) => d.frames <= currentRes.maxFrames);
  const droppedDurations = DURATIONS.filter((d) => d.frames > currentRes.maxFrames);

  useEffect(() => {
    if (!allowedDurations.some((d) => d.value === durValue)) {
      setDurValue(allowedDurations[0]?.value || DEFAULT_DUR);
    }
  }, [resValue]);

  // Turbo 切换自动联动步数
  const stepOptions = STEPS_BY_TURBO[turbo];
  useEffect(() => {
    if (!stepOptions.some((s) => s.value === steps)) {
      setSteps(stepOptions[0].value);
    }
  }, [turbo]);

  const handleClear = () => {
    if (!confirm('确定清空当前表单所有内容？')) return;
    setPrompt('');
    setResValue(DEFAULT_RES);
    setDurValue(DEFAULT_DUR);
    setTurbo(false);
    setSteps('20');
    setSeed('0');
    setCfgScale('');
    setNegativePrompt('');
    setFirstFrame(null);
    setLastFrame(null);
    setRefImages([]);
    setRefVideos([]);
    setRefAudios([]);
    setErr('');
    addToast('已恢复默认配置', 'info');
  };

  const handleSubmit = async (e) => {
    e.preventDefault();
    setErr('');

    if (!prompt.trim()) {
      setErr('请填写 Prompt 提示词');
      return;
    }

    const durObj = DURATIONS.find((d) => d.value === durValue);
    const body = {
      prompt: prompt.trim(),
      width: currentRes.width,
      height: currentRes.height,
      frames: durObj ? durObj.frames : 243,
      turbo,
      steps: parseInt(steps, 10),
      seed: seed === 'random' ? Math.floor(Math.random() * 2 ** 31) : parseInt(seed, 10),
    };

    if (cfgScale.trim() !== '') body.cfg_scale = parseFloat(cfgScale);
    if (negativePrompt.trim() !== '') body.negative_prompt = negativePrompt.trim();

    if (tab === 'fl2va') {
      if (!firstFrame) {
        setErr('首尾帧模式下必须上传【首帧图】');
        return;
      }
      body.first_frame_url = firstFrame;
      if (lastFrame) body.last_frame_url = lastFrame;
    } else if (tab === 'ref2va') {
      if (refImages.length === 0 && refVideos.length === 0 && refAudios.length === 0) {
        setErr('参考模式下至少需要上传 1 张参考图、1 段参考视频或 1 个音频');
        return;
      }
      body.reference_image_urls = refImages;
      body.reference_video_urls = refVideos;
      body.reference_audio_urls = refAudios;
    }

    setSubmitting(true);
    try {
      const job = await createJob(body);
      addToast(`任务提交成功 (#${job.id.substring(0, 8)})`, 'success');
      onCreated(job.id);
    } catch (e) {
      setErr('提交失败: ' + e.message);
      addToast('提交失败: ' + e.message, 'error');
    } finally {
      setSubmitting(false);
    }
  };

  return (
    <div className="max-w-4xl mx-auto py-6 px-4 sm:px-8">
      {/* 顶部标签切换 */}
      <div className="flex items-center gap-1.5 p-1.5 bg-slate-100 dark:bg-zinc-900 border border-slate-200 dark:border-zinc-800 rounded-2xl w-fit shadow-xs mb-6">
        {[
          { key: 'text', label: '文生视频', desc: 'Text to Video' },
          { key: 'fl2va', label: '首尾帧生视频', desc: 'FL2VA' },
          { key: 'ref2va', label: '多参考图生视频', desc: 'Ref2VA' },
        ].map((t) => (
          <button
            key={t.key}
            onClick={() => setTab(t.key)}
            className={`flex flex-col items-start px-4 py-2 rounded-xl text-xs transition-all cursor-pointer ${
              tab === t.key
                ? 'bg-emerald-600 text-white font-semibold shadow-sm'
                : 'text-slate-600 hover:text-slate-900 hover:bg-white/80 dark:text-zinc-400 dark:hover:text-zinc-200 dark:hover:bg-zinc-800/60'
            }`}
          >
            <span>{t.label}</span>
            <span className={`text-[10px] ${tab === t.key ? 'text-emerald-100' : 'text-slate-400 dark:text-zinc-500'}`}>{t.desc}</span>
          </button>
        ))}
      </div>

      <form onSubmit={handleSubmit} className="flex flex-col gap-6">
        {/* Prompt 输入 */}
        <div className="bg-white dark:bg-zinc-900 border border-slate-200 dark:border-zinc-800 rounded-2xl p-5 shadow-xs">
          <div className="flex items-center justify-between mb-2.5">
            <label className="text-xs font-bold uppercase tracking-wider text-slate-700 dark:text-zinc-300 flex items-center gap-2">
              <Sparkles className="w-3.5 h-3.5 text-emerald-600 dark:text-emerald-400" />
              <span>Prompt 提示词</span>
            </label>
            <span className="text-xs text-slate-400 dark:text-zinc-500">{prompt.length} 字</span>
          </div>
          <textarea
            rows={5}
            value={prompt}
            onChange={(e) => setPrompt(e.target.value)}
            placeholder={
              tab === 'fl2va'
                ? '描述首帧到尾帧之间的动态演变过程，例如：女子缓缓端起茶杯，轻轻抿了一口，微风拂动发丝...'
                : '描述您想要生成的电影级视频画面、光影运镜与角色动作...'
            }
            className="w-full bg-slate-50 dark:bg-zinc-950/70 border border-slate-200 dark:border-zinc-800 focus:bg-white focus:border-emerald-500 focus:ring-1 focus:ring-emerald-500/20 rounded-xl p-3.5 text-sm text-slate-900 dark:text-zinc-100 placeholder-slate-400 dark:placeholder-zinc-500 outline-none transition-all resize-y min-h-[120px] leading-relaxed"
          />
        </div>

        {/* 媒体上传区 (非纯文本模式) */}
        {tab === 'fl2va' && (
          <div className="bg-white dark:bg-zinc-900 border border-slate-200 dark:border-zinc-800 rounded-2xl p-5 shadow-xs flex flex-col gap-5">
            <MediaUploader
              label="首帧图片 (必填)"
              accept="image/*"
              type="image"
              value={firstFrame}
              onChange={setFirstFrame}
              hint="视频起始画面"
            />
            <div className="border-t border-slate-100 dark:border-zinc-800/80 pt-4">
              <MediaUploader
                label="尾帧图片 (可选)"
                accept="image/*"
                type="image"
                value={lastFrame}
                onChange={setLastFrame}
                hint="视频结束画面，不填则自由发散"
              />
            </div>
          </div>
        )}

        {tab === 'ref2va' && (
          <div className="bg-white dark:bg-zinc-900 border border-slate-200 dark:border-zinc-800 rounded-2xl p-5 shadow-xs flex flex-col gap-5">
            <MediaUploader
              label="参考图片 (可多选)"
              accept="image/*"
              type="image"
              multiple={true}
              value={refImages}
              onChange={setRefImages}
              hint="角色/场景设定图，无数量限制"
            />
            <div className="border-t border-slate-100 dark:border-zinc-800/80 pt-4">
              <MediaUploader
                label="参考视频 (可选 · 最多3段)"
                accept="video/*"
                type="video"
                multiple={true}
                maxCount={3}
                value={refVideos}
                onChange={setRefVideos}
                hint="2-15秒动态参考，自动保留音轨"
              />
            </div>
            <div className="border-t border-slate-100 dark:border-zinc-800/80 pt-4">
              <MediaUploader
                label="独立音频参考 (可选 · 最多3首)"
                accept="audio/*"
                type="audio"
                multiple={true}
                maxCount={3}
                value={refAudios}
                onChange={setRefAudios}
                hint="背景音乐或台词声音参考"
              />
            </div>
          </div>
        )}

        {/* 核心生成参数配置 */}
        <div className="bg-white dark:bg-zinc-900 border border-slate-200 dark:border-zinc-800 rounded-2xl p-5 shadow-xs flex flex-col gap-5">
          <div className="flex items-center gap-2 text-xs font-bold uppercase tracking-wider text-slate-700 dark:text-zinc-300">
            <Sliders className="w-3.5 h-3.5 text-emerald-600 dark:text-emerald-400" />
            <span>生成参数与画质规格</span>
          </div>

          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            {/* 分辨率 */}
            <div className="flex flex-col gap-1.5">
              <label className="text-xs text-slate-600 dark:text-zinc-400 font-medium">分辨率与画幅</label>
              <select
                value={resValue}
                onChange={(e) => setResValue(e.target.value)}
                className="bg-slate-50 dark:bg-zinc-950/80 border border-slate-200 dark:border-zinc-800 rounded-xl px-3 py-2.5 text-xs text-slate-800 dark:text-zinc-200 outline-none focus:border-emerald-500 cursor-pointer"
              >
                {RESOLUTIONS.map((r) => (
                  <option key={r.value} value={r.value}>
                    {r.label}
                  </option>
                ))}
              </select>
            </div>

            {/* 时长 */}
            <div className="flex flex-col gap-1.5">
              <label className="text-xs text-slate-600 dark:text-zinc-400 font-medium">生成时长 (帧数)</label>
              <select
                value={durValue}
                onChange={(e) => setDurValue(e.target.value)}
                className="bg-slate-50 dark:bg-zinc-950/80 border border-slate-200 dark:border-zinc-800 rounded-xl px-3 py-2.5 text-xs text-slate-800 dark:text-zinc-200 outline-none focus:border-emerald-500 cursor-pointer"
              >
                {allowedDurations.map((d) => (
                  <option key={d.value} value={d.value}>
                    {d.label}
                  </option>
                ))}
              </select>
            </div>
          </div>

          {/* 显存与时长安全提示 */}
          {droppedDurations.length > 0 && (
            <div className="flex items-center gap-2 p-2.5 bg-amber-50 border border-amber-200 dark:bg-amber-950/30 dark:border-amber-600/30 rounded-xl text-xs text-amber-800 dark:text-amber-300">
              <AlertCircle className="w-4 h-4 shrink-0 text-amber-600 dark:text-amber-400" />
              <span>
                {currentRes.label} 实测上限 {currentRes.maxFrames} 帧，已自动过滤超出显存承受的超长档位。
              </span>
            </div>
          )}

          {/* Turbo 模式与步数联动 */}
          <div className="grid grid-cols-1 sm:grid-cols-3 gap-4 pt-3 border-t border-slate-100 dark:border-zinc-800/80 items-center">
            {/* Turbo Toggle */}
            <div className="flex flex-col gap-1.5">
              <label className="text-xs text-slate-600 dark:text-zinc-400 font-medium">Turbo 加速 LoRA</label>
              <div className="flex p-1 bg-slate-100 dark:bg-zinc-950/80 border border-slate-200 dark:border-zinc-800 rounded-xl">
                <button
                  type="button"
                  onClick={() => setTurbo(false)}
                  className={`flex-1 py-1.5 text-xs font-medium rounded-lg transition-colors cursor-pointer ${
                    !turbo ? 'bg-white dark:bg-zinc-800 text-slate-800 dark:text-white shadow-xs' : 'text-slate-500 dark:text-zinc-400 hover:text-slate-800'
                  }`}
                >
                  关 (稳健多步)
                </button>
                <button
                  type="button"
                  onClick={() => setTurbo(true)}
                  className={`flex-1 py-1.5 text-xs font-medium rounded-lg transition-colors cursor-pointer ${
                    turbo ? 'bg-emerald-600 text-white shadow-xs' : 'text-slate-500 dark:text-zinc-400 hover:text-slate-800'
                  }`}
                >
                  开 (4步极速)
                </button>
              </div>
            </div>

            {/* 采样步数 */}
            <div className="flex flex-col gap-1.5">
              <label className="text-xs text-slate-600 dark:text-zinc-400 font-medium">采样步数 (Steps)</label>
              <select
                value={steps}
                onChange={(e) => setSteps(e.target.value)}
                className="bg-slate-50 dark:bg-zinc-950/80 border border-slate-200 dark:border-zinc-800 rounded-xl px-3 py-2 text-xs text-slate-800 dark:text-zinc-200 outline-none focus:border-emerald-500 cursor-pointer"
              >
                {stepOptions.map((s) => (
                  <option key={s.value} value={s.value}>
                    {s.label}
                  </option>
                ))}
              </select>
            </div>

            {/* 随机种子 */}
            <div className="flex flex-col gap-1.5">
              <label className="text-xs text-slate-600 dark:text-zinc-400 font-medium">随机种子 (Seed)</label>
              <select
                value={seed}
                onChange={(e) => setSeed(e.target.value)}
                className="bg-slate-50 dark:bg-zinc-950/80 border border-slate-200 dark:border-zinc-800 rounded-xl px-3 py-2 text-xs text-slate-800 dark:text-zinc-200 outline-none focus:border-emerald-500 cursor-pointer"
              >
                {SEED_OPTIONS.map((s) => (
                  <option key={s.value} value={s.value}>
                    {s.label}
                  </option>
                ))}
              </select>
            </div>
          </div>

          {/* 高级参数折叠面板 */}
          <div className="pt-2">
            <button
              type="button"
              onClick={() => setShowAdvanced(!showAdvanced)}
              className="flex items-center gap-1.5 text-xs font-medium text-slate-600 dark:text-zinc-400 hover:text-slate-900 dark:hover:text-zinc-200 transition-colors cursor-pointer"
            >
              <span>高级调参 (CFG / 负面提示词)</span>
              {showAdvanced ? <ChevronUp className="w-3.5 h-3.5" /> : <ChevronDown className="w-3.5 h-3.5" />}
            </button>

            {showAdvanced && (
              <div className="mt-3 p-4 bg-slate-50 dark:bg-zinc-950/50 border border-slate-200 dark:border-zinc-800/80 rounded-xl flex flex-col gap-4">
                <div className="flex flex-col gap-1.5">
                  <label className="text-xs text-slate-600 dark:text-zinc-400">CFG Scale (留空默认 1.0)</label>
                  <input
                    type="number"
                    step="0.1"
                    min="0"
                    placeholder="留空 = 1.0 (蒸馏 LoRA 调太高易出伪影)"
                    value={cfgScale}
                    onChange={(e) => setCfgScale(e.target.value)}
                    className="bg-white dark:bg-zinc-900 border border-slate-200 dark:border-zinc-800 rounded-xl px-3 py-2 text-xs text-slate-800 dark:text-zinc-200 outline-none focus:border-emerald-500"
                  />
                </div>
                <div className="flex flex-col gap-1.5">
                  <label className="text-xs text-slate-600 dark:text-zinc-400">负面提示词 Negative Prompt</label>
                  <textarea
                    rows={2}
                    placeholder="例如：模糊，低画质，肢体变形，拖影，五官扭曲"
                    value={negativePrompt}
                    onChange={(e) => setNegativePrompt(e.target.value)}
                    className="bg-white dark:bg-zinc-900 border border-slate-200 dark:border-zinc-800 rounded-xl p-2.5 text-xs text-slate-800 dark:text-zinc-200 outline-none focus:border-emerald-500 resize-none"
                  />
                </div>
              </div>
            )}
          </div>
        </div>

        {/* 错误提示 */}
        {err && (
          <div className="p-3 bg-rose-50 border border-rose-200 dark:bg-rose-950/60 dark:border-rose-500/40 rounded-xl text-xs text-rose-700 dark:text-rose-300 flex items-center gap-2">
            <AlertCircle className="w-4 h-4 shrink-0 text-rose-500" />
            <span>{err}</span>
          </div>
        )}

        {/* 操作按钮栏 */}
        <div className="flex items-center justify-end gap-3 pb-8">
          <button
            type="button"
            onClick={handleClear}
            className="px-5 py-2.5 bg-slate-100 hover:bg-slate-200 dark:bg-zinc-800 dark:hover:bg-zinc-700 text-slate-700 dark:text-zinc-300 text-xs font-medium rounded-xl transition-colors cursor-pointer border border-slate-200 dark:border-zinc-700"
          >
            清空表单
          </button>
          <button
            type="submit"
            disabled={submitting}
            className="px-7 py-2.5 bg-emerald-600 hover:bg-emerald-700 text-white text-xs font-semibold rounded-xl transition-all shadow-md shadow-emerald-600/30 flex items-center gap-2 cursor-pointer disabled:opacity-50"
          >
            {submitting ? <RefreshCw className="w-4 h-4 animate-spin" /> : <Send className="w-4 h-4" />}
            <span>{submitting ? '正在提交…' : '立即生成视频'}</span>
          </button>
        </div>
      </form>
    </div>
  );
}