import React from "react";
import {
  useCurrentFrame,
  useVideoConfig,
  AbsoluteFill,
  Img,
  staticFile,
  interpolate,
} from "remotion";
import type { RemotionScene } from "../Root";
import type { RenderSegmentExtension } from "@pipeline/shared";
import { GITHUB_WEEKLY_PALETTE } from "../base/theme/colors";
import { SubtitleBar } from "../base/components/subtitle-bar";
import { Watermark } from "../base/components/watermark";
import { formatCount } from "@pipeline/shared";

/**
 * github-weekly content scene — the LIGHT magazine-weekly counterpart of the
 * github-trending scene. Paper background, dark slate text, editorial section
 * cards (white cards on paper, the inverse of the daily board's dark-on-dark),
 * and the same named images (social preview + star history) from the shared
 * github board extension.
 */
interface GithubWeeklySceneProps {
  scene: RemotionScene;
  sceneIndex: number;
  totalScenes: number;
  totalFrames: number;
  title: string;
  channelName?: string;
}

const GithubWeeklyScene: React.FC<GithubWeeklySceneProps> = ({
  scene,
  sceneIndex,
  channelName,
}) => {
  const frame = useCurrentFrame();
  const { width, height, durationInFrames } = useVideoConfig();
  const isPortrait = height > width;
  const palette = GITHUB_WEEKLY_PALETTE[sceneIndex % GITHUB_WEEKLY_PALETTE.length];
  const github: RenderSegmentExtension | undefined =
    scene.extension?.type === "github-trending" || scene.extension?.type === "github-weekly"
      ? scene.extension
      : undefined;

  const sceneDur = durationInFrames;
  const fadeOpacity = interpolate(
    frame,
    [0, 8, sceneDur - 8, sceneDur],
    [0, 1, 1, 0],
    { extrapolateLeft: "clamp", extrapolateRight: "clamp" }
  );

  // Named images from the shared board extension (resolved to filenames by the
  // renderer). Object, not positional array — socialPreview / starHistory.
  const socialPreview = github?.images?.socialPreview;
  const starHistory = github?.images?.starHistory;

  const pad = isPortrait ? 48 : 80;
  const footerReserved = isPortrait ? 500 : 140;

  // Landscape geometry (portrait uses flex layout below — no headerHeight).
  const landscapeHeaderHeight = 220;
  const landscapeDividerY = pad + landscapeHeaderHeight;
  const landscapeContentTop = landscapeDividerY + 24;
  const landscapeContentHeight = height - footerReserved - landscapeContentTop;
  const landscapeContentWidth = width - pad * 2;

  const repo = github?.repo;
  const language = repo?.language || "";
  const languageColor = repo?.languageColor || palette.accent;
  // Under the weekly board, todayStars carries the WEEKLY gain.
  const starsLabel = repo?.stars != null ? `${formatCount(repo.stars)} stars` : "";
  const weekGainLabel =
    repo?.todayStars != null ? `本周 +${formatCount(repo.todayStars)}` : "";
  const license = repo?.license || "";
  const fullName = repo?.fullName || scene.title || "";

  if (!github) {
    return (
      <AbsoluteFill style={{ opacity: fadeOpacity, background: `linear-gradient(135deg, ${palette.from} 0%, ${palette.to} 100%)` }}>
        <div style={{
          position: "absolute", inset: 0, display: "flex",
          alignItems: "center", justifyContent: "center", padding: pad,
        }}>
          <div style={{ fontSize: 48, fontWeight: 700, color: "#1e293b", fontFamily: "Noto Sans SC", textAlign: "center" }}>
            {scene.title || scene.captionOrigin}
          </div>
        </div>
        {(scene.caption?.length ?? 0) > 0 && <SubtitleBar caption={scene.caption} />}
        <Watermark text={channelName} light />
      </AbsoluteFill>
    );
  }

  const renderHeader = (fontSize: number, tagSize: "default" | "large", dotSize: number) => (
    <div>
      <div style={{
        fontSize,
        fontWeight: 800,
        color: "#1e293b",
        fontFamily: "Noto Sans SC",
        lineHeight: 1.15,
        letterSpacing: "-0.01em",
      }}>
        {fullName}
      </div>
      <div style={{ display: "flex", flexWrap: "wrap", gap: 14, marginTop: 22 }}>
        {language && (
          <Tag accent={palette.accent} size={tagSize}>
            <ColorDot color={languageColor} size={dotSize} />
            {language}
          </Tag>
        )}
        {weekGainLabel && (
          <Tag accent={palette.accent} size={tagSize} emphasized>
            {weekGainLabel}
          </Tag>
        )}
        {starsLabel && <Tag accent={palette.accent} size={tagSize}>{starsLabel}</Tag>}
        {license && <Tag accent={palette.accent} size={tagSize}>{license}</Tag>}
      </div>
    </div>
  );

  return (
    <AbsoluteFill style={{
      opacity: fadeOpacity,
      background: `linear-gradient(135deg, ${palette.from} 0%, ${palette.to} 100%)`,
    }}>
      {/* Subtle paper ruling (the light counterpart of the daily board's grid) */}
      <div style={{
        position: "absolute", inset: 0,
        backgroundImage: `
          linear-gradient(rgba(30,41,59,0.03) 1px, transparent 1px),
          linear-gradient(90deg, rgba(30,41,59,0.03) 1px, transparent 1px)
        `,
        backgroundSize: "80px 80px",
      }} />

      {/* Top accent rule — a double editorial rule, magazine style */}
      <div style={{ position: "absolute", top: 0, left: 0, width: "100%", height: 6, background: palette.accent }} />
      <div style={{ position: "absolute", top: 10, left: 0, width: "100%", height: 1, background: `${palette.accent}55` }} />

      {isPortrait ? (
        // Portrait: flex column. Header takes natural height, divider sits
        // right below it, content fills the remainder. paddingBottom reserves
        // space for the elevated subtitle (bottom: 380).
        <div style={{
          position: "relative",
          display: "flex",
          flexDirection: "column",
          width: "100%",
          height: "100%",
          boxSizing: "border-box",
          padding: `${pad}px ${pad}px ${footerReserved}px`,
        }}>
          {renderHeader(92, "large", 16)}
          <div style={{
            height: 1,
            background: "rgba(30,41,59,0.18)",
            marginTop: 24,
          }} />
          <PortraitContent
            palette={palette}
            socialPreview={socialPreview}
            starHistory={starHistory}
            github={github}
          />
        </div>
      ) : (
        // Landscape: absolute positioning (single-line 80px header).
        <>
          <div style={{
            position: "absolute",
            top: pad,
            left: pad,
            right: pad,
          }}>
            {renderHeader(80, "default", 14)}
          </div>

          <div style={{
            position: "absolute",
            top: landscapeDividerY,
            left: pad,
            right: pad,
            height: 1,
            background: "rgba(30,41,59,0.18)",
          }} />

          <LandscapeContent
            contentTop={landscapeContentTop}
            contentHeight={landscapeContentHeight}
            pad={pad}
            contentWidth={landscapeContentWidth}
            palette={palette}
            socialPreview={socialPreview}
            starHistory={starHistory}
            github={github}
          />
        </>
      )}

      {(scene.caption?.length ?? 0) > 0 && (
        <SubtitleBar
          caption={scene.caption}
          style={isPortrait ? { bottom: 380 } : undefined}
          fontSize={isPortrait ? 56 : undefined}
        />
      )}
      <Watermark text={channelName} light />
    </AbsoluteFill>
  );
};

// --- Sub-components (light counterparts of the github-trending ones) ---

export const Tag: React.FC<{
  accent: string;
  children: React.ReactNode;
  size?: "default" | "large";
  emphasized?: boolean;
}> = ({ accent, children, size = "default", emphasized }) => (
  <div style={{
    display: "inline-flex",
    alignItems: "center",
    gap: 10,
    padding: "12px 24px",
    borderRadius: 999,
    background: emphasized ? accent : "rgba(255,255,255,0.75)",
    border: `1px solid ${emphasized ? accent : `${accent}44`}`,
    color: emphasized ? "#ffffff" : "#334155",
    fontFamily: "Noto Sans SC",
    fontSize: size === "large" ? 32 : 28,
    fontWeight: emphasized ? 700 : 500,
    backdropFilter: "blur(4px)",
  }}>
    {children}
  </div>
);

export const ColorDot: React.FC<{ color: string; size?: number }> = ({ color, size = 14 }) => (
  <span style={{
    display: "inline-block",
    width: size,
    height: size,
    borderRadius: "50%",
    background: color || "#999",
  }} />
);

const ImageFrame: React.FC<{ children: React.ReactNode; flex?: string | number }> = ({ children, flex }) => (
  <div style={{
    flex,
    width: flex ? undefined : "100%",
    height: "auto",
    background: "#ffffff",
    border: "1px solid rgba(30,41,59,0.12)",
    borderRadius: 12,
    overflow: "hidden",
    display: "flex",
    alignItems: "center",
    justifyContent: "center",
    boxShadow: "0 10px 28px rgba(120,100,60,0.14), 0 2px 6px rgba(120,100,60,0.10)",
  }}>
    {children}
  </div>
);

const Section: React.FC<{
  title: string;
  accent: string;
  body: string;
  flex?: number;
  size?: "default" | "large";
}> = ({ title, accent, body, flex, size = "default" }) => {
  const isLarge = size === "large";
  // Strip trailing punctuation that would look awkward if rendered at the
  // end of the clamped text (LLM occasionally leaves a hanging 。，,；).
  const cleanBody = body.replace(/[。，、,.;；:：\s]+$/, "");
  return (
    <div style={{
      flex: flex ?? 1,
      background: "rgba(255,255,255,0.82)",
      border: "1px solid rgba(30,41,59,0.10)",
      borderLeft: `${isLarge ? 6 : 5}px solid ${accent}`,
      borderRadius: 10,
      padding: isLarge ? "24px 32px" : "22px 28px",
      display: "flex",
      flexDirection: "column",
      gap: 12,
      minHeight: 0,
    }}>
      <div style={{
        display: "flex",
        alignItems: "center",
        gap: 12,
      }}>
        {/* No color bar (it moved to the card's left border) — editorial
            small-caps style label with wide tracking instead. */}
        <span style={{
          fontSize: isLarge ? 34 : 28,
          fontWeight: 700,
          color: accent,
          fontFamily: "Noto Sans SC",
          letterSpacing: "0.14em",
        }}>
          {title}
        </span>
      </div>
      <div style={{
        // Size to content (capped at N lines by -webkit-line-clamp), not by
        // flex distribution — mirrors the github-trending Section rationale.
        flex: "0 0 auto",
        fontSize: isLarge ? 60 : 32,
        lineHeight: isLarge ? 1.35 : 1.4,
        color: "#334155",
        fontFamily: "Noto Sans SC",
        fontWeight: 400,
        display: "-webkit-box",
        WebkitLineClamp: isLarge ? 3 : 5,
        WebkitBoxOrient: "vertical",
        overflow: "hidden",
        overflowWrap: "break-word",
      }}>
        {cleanBody}
      </div>
    </div>
  );
};

interface PortraitContentProps {
  palette: { from: string; to: string; accent: string };
  socialPreview?: { filename: string };
  starHistory?: { filename: string };
  github: RenderSegmentExtension;
}

// PortraitContent uses flex:1 to fill remaining height after the header
// (which takes its natural height in the parent flex column).
const PortraitContent: React.FC<PortraitContentProps> = ({
  palette, socialPreview, starHistory, github,
}) => {
  const hasAnyImage = !!(socialPreview || starHistory);
  return (
    <div style={{
      flex: 1,
      display: "flex",
      flexDirection: "column",
      gap: 28,
      paddingTop: 24,
      minHeight: 0,
    }}>
      {/* Top row: images side-by-side, each flex:1 (same width) with natural
          height. Row sizes to tallest child; shorter child top-aligned. */}
      {hasAnyImage && (
        <div style={{
          display: "flex",
          gap: 20,
          alignItems: "flex-start",
        }}>
          {socialPreview && (
            <ImageFrame flex={1}>
              <Img src={staticFile(socialPreview.filename)} style={{ display: "block", width: "100%", height: "auto" }} />
            </ImageFrame>
          )}
          {starHistory && (
            <ImageFrame flex={1}>
              <Img src={staticFile(starHistory.filename)} style={{ display: "block", width: "100%", height: "auto" }} />
            </ImageFrame>
          )}
        </div>
      )}

      {/* Bottom: 2 sections stacked (full height when no images) */}
      <div style={{
        flex: 1,
        display: "flex",
        flexDirection: "column",
        gap: 28,
      }}>
        <Section title="项目亮点" accent={palette.accent} body={github.highlights} size="large" />
        <Section title="建议" accent={palette.accent} body={github.review} size="large" />
      </div>
    </div>
  );
};

interface LandscapeContentProps {
  contentTop: number;
  contentHeight: number;
  pad: number;
  contentWidth: number;
  palette: { from: string; to: string; accent: string };
  socialPreview?: { filename: string };
  starHistory?: { filename: string };
  github: RenderSegmentExtension;
}

const LandscapeContent: React.FC<LandscapeContentProps> = ({
  contentTop, contentHeight, pad, contentWidth,
  palette, socialPreview, starHistory, github,
}) => {
  const hasAnyImage = !!(socialPreview || starHistory);
  // Left column: cap width so both images stacked fit within contentHeight.
  // Assumes social preview ~2:1 and star history ~1.5:1 → combined height 7/6.
  const leftColWidth = hasAnyImage
    ? Math.min(
        Math.round(contentWidth * 0.4),
        Math.round((contentHeight - 20) / (7 / 6)),
      )
    : 0;
  const colGap = 40;

  return (
    <div style={{
      position: "absolute",
      top: contentTop,
      left: pad,
      width: contentWidth,
      height: contentHeight,
      display: "flex",
      gap: colGap,
    }}>
      {hasAnyImage && (
        <div style={{
          width: leftColWidth,
          height: contentHeight,
          display: "flex",
          flexDirection: "column",
          gap: 20,
          overflow: "hidden",
        }}>
          {socialPreview && (
            <ImageFrame>
              <Img src={staticFile(socialPreview.filename)} style={{ display: "block", width: "100%", height: "auto" }} />
            </ImageFrame>
          )}
          {starHistory && (
            <ImageFrame>
              <Img src={staticFile(starHistory.filename)} style={{ display: "block", width: "100%", height: "auto" }} />
            </ImageFrame>
          )}
        </div>
      )}

      <div style={{
        flex: 1,
        height: contentHeight,
        display: "flex",
        flexDirection: "column",
        gap: 20,
      }}>
        <Section title="项目亮点" accent={palette.accent} body={github.highlights} />
        <Section title="项目介绍" accent={palette.accent} body={github.intro} flex={3} />
        <Section title="建议" accent={palette.accent} body={github.review} />
      </div>
    </div>
  );
};

export default GithubWeeklyScene;