import { useState, type PointerEvent } from "react";

type ShowcaseVisualProps = {
  activeIndex: number;
};

type CaptureTool = "rect" | "arrow" | "pen" | "mosaic";
type OcrLanguage = "zh" | "en" | "auto";
type UploadDestination = {
  id: "obs" | "ssh" | "ftp";
  label: string;
  detail: string;
};

const destinations: UploadDestination[] = [
  { id: "obs", label: "OBS", detail: "Bucket" },
  { id: "ssh", label: "SSH", detail: "Server" },
  { id: "ftp", label: "FTP", detail: "Remote" },
];

const uploadRoutes: Record<UploadDestination["id"], string> = {
  obs: "M 50 30 C 59 30 61 17 71 17",
  ssh: "M 50 30 C 58 30 63 30 71 30",
  ftp: "M 50 30 C 59 30 61 43 71 43",
};

const ocrModes: Array<{
  id: OcrLanguage;
  label: string;
  name: string;
  lines: string[];
  characters: number;
  confidence: string;
}> = [
  {
    id: "zh",
    label: "中",
    name: "中文",
    lines: ["让每一次截图直接进入下一步。"],
    characters: 15,
    confidence: "99.5%",
  },
  {
    id: "en",
    label: "EN",
    name: "English",
    lines: ["Capture, understand, share."],
    characters: 27,
    confidence: "99.1%",
  },
  {
    id: "auto",
    label: "AUTO",
    name: "中英混排",
    lines: ["Capture, understand, share.", "让每一次截图直接进入下一步。"],
    characters: 42,
    confidence: "99.2%",
  },
];

const aiModes = [
  {
    id: "vision",
    label: "识图",
    result: "检测到系统权限弹窗，截图权限尚未开启。",
    score: "96%",
  },
  {
    id: "summary",
    label: "总结",
    result: "当前页面包含 3 个设置项，建议先开启屏幕录制权限。",
    score: "93%",
  },
  {
    id: "question",
    label: "问答",
    result: "前往系统设置中的隐私与安全性即可完成授权。",
    score: "98%",
  },
];

const captureTools: Array<{ id: CaptureTool; label: string }> = [
  { id: "rect", label: "矩形" },
  { id: "arrow", label: "箭头" },
  { id: "pen", label: "画笔" },
  { id: "mosaic", label: "马赛克" },
];

function stopSceneDrag(event: PointerEvent<HTMLElement>) {
  event.stopPropagation();
}

function UploadScene() {
  const [selected, setSelected] = useState<UploadDestination>(destinations[0]);
  const routePath = uploadRoutes[selected.id];

  return (
    <div className={`visual-scene upload-scene target-${selected.id}`}>
      <div className="upload-file-card">
        <div className="upload-file-preview" aria-hidden="true">
          <div className="screenshot-window-bar">
            <span><i /><i /><i /></span>
            <b className="screenshot-address-bar" />
          </div>
          <div className="screenshot-window-body">
            <div className="screenshot-sidebar"><i /><i /><i /><i /></div>
            <div className="screenshot-main">
              <span className="screenshot-heading" />
              <span className="screenshot-row row-long" />
              <span className="screenshot-row row-medium" />
              <div className="screenshot-card-grid">
                <i /><i /><i />
              </div>
              <div className="screenshot-copy-lines">
                <i /><i /><i />
              </div>
            </div>
          </div>
          <div className="upload-capture-frame">
            <i className="upload-capture-corner corner-nw" />
            <i className="upload-capture-corner corner-ne" />
            <i className="upload-capture-corner corner-sw" />
            <i className="upload-capture-corner corner-se" />
          </div>
        </div>
        <div className="upload-file-copy">
          <span>SCREENSHOT-1428.PNG</span>
        </div>
      </div>

      <svg
        className="upload-route"
        viewBox="0 0 100 60"
        preserveAspectRatio="none"
        aria-hidden="true"
      >
        <path
          key={`route-${selected.id}`}
          className="upload-route-line"
          d={routePath}
          vectorEffect="non-scaling-stroke"
        />
        <path
          key={`shimmer-${selected.id}`}
          className="upload-route-shimmer"
          d={routePath}
          pathLength="100"
          strokeDasharray="16 84"
          vectorEffect="non-scaling-stroke"
        />
      </svg>

      <span key={`packet-${selected.id}`} className={`upload-packet packet-${selected.id}`} aria-hidden="true">
        <svg viewBox="0 0 20 20">
          <path d="M 5 10 H 14 M 10.5 6.5 L 14 10 L 10.5 13.5" />
        </svg>
      </span>

      <div className="upload-destinations" role="group" aria-label="上传目标">
        {destinations.map((destination) => (
          <button
            key={destination.id}
            type="button"
            className={destination.id === selected.id ? "is-selected" : ""}
            aria-pressed={destination.id === selected.id}
            aria-label={`选择 ${destination.label} 上传目标`}
            onPointerDown={stopSceneDrag}
            onClick={() => setSelected(destination)}
          >
            <span className="destination-status" />
            <strong>{destination.label}</strong>
            <small>{destination.detail}</small>
          </button>
        ))}
      </div>

      <div className="upload-result scene-float-delayed" aria-live="polite">
        <span className="result-check" aria-hidden="true">✓</span>
        <div>
          <small>LINK COPIED</small>
          <strong>cdn.snapgo.dev/{selected.id}/...</strong>
        </div>
      </div>
    </div>
  );
}

function IdentificationScene() {
  const [mode, setMode] = useState(aiModes[0]);

  return (
    <div className="visual-scene identification-scene">
      <div className="ai-source-card">
        <div className="mini-window-bar" aria-hidden="true">
          <span />
          <span />
          <span />
        </div>
        <div className="ai-source-content">
          <span className="source-sidebar" />
          <div className="source-settings">
            <i />
            <i />
            <i />
          </div>
          <div className="source-dialog">
            <span className="dialog-icon">!</span>
            <div>
              <strong>Permission required</strong>
              <small>Screen Recording</small>
            </div>
          </div>
        </div>
        <span className="ai-scan-line" aria-hidden="true" />
      </div>

      <div className="ai-core" aria-hidden="true">
        <span>AI</span>
        <i className="ai-orbit orbit-one" />
        <i className="ai-orbit orbit-two" />
      </div>

      <div className="ai-result-card scene-float-soft" aria-live="polite">
        <div className="ai-result-heading">
          <span className="ai-spark" aria-hidden="true">✦</span>
          <strong>SnapGo Vision</strong>
          <i />
        </div>
        <p>{mode.result}</p>
        <div className="confidence-row">
          <span><i /></span>
          <small>{mode.score} confidence</small>
        </div>
      </div>

      <div className="ai-mode-switch" role="group" aria-label="AI 处理模式">
        {aiModes.map((item) => (
          <button
            key={item.id}
            type="button"
            className={item.id === mode.id ? "is-selected" : ""}
            aria-pressed={item.id === mode.id}
            onPointerDown={stopSceneDrag}
            onClick={() => setMode(item)}
          >
            {item.label}
          </button>
        ))}
      </div>
    </div>
  );
}

function OcrScene() {
  const [copied, setCopied] = useState(false);
  const [language, setLanguage] = useState<OcrLanguage>("auto");
  const activeMode = ocrModes.find((mode) => mode.id === language) ?? ocrModes[2];

  function selectLanguage(mode: OcrLanguage) {
    setLanguage(mode);
    setCopied(false);
  }

  return (
    <div className="visual-scene ocr-scene">
      <div className="ocr-document">
        <div className="document-header">
          <span />
          <div><i /><i /><i /></div>
        </div>
        <div className="document-copy">
          <strong>Release notes</strong>
          <span className="text-line line-long" />
          <span className="text-line line-medium" />
          <span className="text-line line-highlight"><i>Capture, understand, share.</i></span>
          <span className="text-line line-long" />
          <span className="text-line line-short" />
          <span className="text-line line-highlight secondary"><i>让每一次截图直接进入下一步。</i></span>
        </div>
        <span className="ocr-scan-bar" aria-hidden="true" />
      </div>

      <div className="ocr-selection-card scene-float-delayed">
        <div className="selection-heading">
          <span>OCR</span>
          <small>{activeMode.name}</small>
        </div>
        <p>
          {activeMode.lines.map((line) => <span key={line}>{line}</span>)}
        </p>
        <div className="selection-meta">
          <span>{activeMode.characters} characters</span>
          <strong>{activeMode.confidence}</strong>
        </div>
        <button
          type="button"
          className={copied ? "is-copied" : ""}
          aria-pressed={copied}
          onPointerDown={stopSceneDrag}
          onClick={() => setCopied((current) => !current)}
        >
          <span aria-hidden="true">{copied ? "✓" : "⌘C"}</span>
          {copied ? "已复制" : "复制文本"}
        </button>
      </div>

      <div className="ocr-language-pills" role="group" aria-label="OCR 识别语言">
        {ocrModes.map((mode) => (
          <button
            key={mode.id}
            type="button"
            className={mode.id === language ? "is-selected" : ""}
            aria-pressed={mode.id === language}
            onPointerDown={stopSceneDrag}
            onClick={() => selectLanguage(mode.id)}
          >
            {mode.label}
          </button>
        ))}
      </div>
    </div>
  );
}

function ToolGlyph({ tool }: { tool: CaptureTool }) {
  if (tool === "rect") {
    return <svg viewBox="0 0 20 20" aria-hidden="true"><rect x="4" y="4" width="12" height="12" rx="2" /></svg>;
  }

  if (tool === "arrow") {
    return <svg viewBox="0 0 20 20" aria-hidden="true"><path d="M4 15 15 4M9 4h6v6" /></svg>;
  }

  if (tool === "pen") {
    return <svg viewBox="0 0 20 20" aria-hidden="true"><path d="m5 15 2.2-4.7L13.8 3.7l2.5 2.5-6.6 6.6L5 15Z" /><path d="m11.8 5.7 2.5 2.5" /></svg>;
  }

  return (
    <svg viewBox="0 0 20 20" aria-hidden="true">
      <rect x="3" y="3" width="5" height="5" />
      <rect x="12" y="3" width="5" height="5" />
      <rect x="3" y="12" width="5" height="5" />
      <rect x="12" y="12" width="5" height="5" />
    </svg>
  );
}

function AnnotationPreview({ tool }: { tool: CaptureTool }) {
  if (tool === "arrow") {
    return (
      <svg className="annotation-arrow" viewBox="0 0 180 110" aria-hidden="true">
        <path d="M28 84C66 78 91 56 139 31" />
        <path d="m121 27 20 3-8 18" />
      </svg>
    );
  }

  if (tool === "pen") {
    return (
      <svg className="annotation-pen" viewBox="0 0 180 110" aria-hidden="true">
        <path d="M24 76c20-42 36 25 57-6s33-33 48-4c9 18 21 13 29-7" />
      </svg>
    );
  }

  if (tool === "mosaic") {
    return <div className="annotation-mosaic" aria-hidden="true">{Array.from({ length: 20 }, (_, index) => <span key={index} />)}</div>;
  }

  return <div className="annotation-rect" aria-hidden="true"><span /><span /><span /><span /></div>;
}

function CaptureScene() {
  const [tool, setTool] = useState<CaptureTool>("rect");

  return (
    <div className="visual-scene capture-scene">
      <div className="capture-canvas">
        <div className="canvas-app-bar">
          <span />
          <strong>Project overview</strong>
          <i />
        </div>
        <div className="canvas-layout" aria-hidden="true">
          <span className="canvas-sidebar" />
          <div className="canvas-content">
            <i className="canvas-heading" />
            <i className="canvas-line" />
            <i className="canvas-line short" />
            <div className="canvas-chart"><span /><span /><span /><span /><span /></div>
          </div>
        </div>
        <div className="capture-selection">
          <span className="selection-size">1280 × 720</span>
          <i className="selection-handle handle-nw" />
          <i className="selection-handle handle-ne" />
          <i className="selection-handle handle-sw" />
          <i className="selection-handle handle-se" />
          <AnnotationPreview tool={tool} />
        </div>
      </div>

      <div className="capture-toolbar" role="toolbar" aria-label="截图标注工具">
        {captureTools.map((item) => (
          <button
            key={item.id}
            type="button"
            className={item.id === tool ? "is-selected" : ""}
            aria-label={item.label}
            aria-pressed={item.id === tool}
            title={item.label}
            onPointerDown={stopSceneDrag}
            onClick={() => setTool(item.id)}
          >
            <ToolGlyph tool={item.id} />
          </button>
        ))}
        <span className="toolbar-divider" />
        <span className="toolbar-color" aria-hidden="true" />
      </div>
    </div>
  );
}

const scenes = [UploadScene, IdentificationScene, OcrScene, CaptureScene];

export default function ShowcaseVisual({ activeIndex }: ShowcaseVisualProps) {
  const Scene = scenes[activeIndex] ?? UploadScene;

  return (
    <div className="scene-parallax" data-testid="showcase-visual">
      <Scene />
    </div>
  );
}