/**
 * 生成后端种子静态资源：D:/bsch/cms/upload/seed/
 * - SVG 场景插画（校园主题分层构图：天空渐变/山峦/建筑剪影/树木/水面；无占位文字）
 * - 最小合法 PDF（附件演示可真实打开）
 * 轮播 1920×560 对齐主题包设计尺寸约定（themes 下的 theme.json bannerSize）。
 * 用法：node seed-assets.cjs
 */
const fs = require("fs");
const path = require("path");

const OUT = "D:/bsch/cms/upload/seed";
fs.mkdirSync(OUT, { recursive: true });

function hashCode(s) {
    let h = 0;
    for (let i = 0; i < s.length; i++) h = (h * 31 + s.charCodeAt(i)) | 0;
    return Math.abs(h);
}

/** 确定性伪随机（同名资源每次生成完全一致，保证截图可复现） */
function rng(seed) {
    let s = seed || 1;
    return () => {
        s = (s * 1664525 + 1013904223) | 0;
        return ((s >>> 8) & 0xffff) / 0xffff;
    };
}

/** 一栋建筑剪影（含窗户点阵） */
function building(x, baseY, w, h, fill, winFill, r) {
    const cols = Math.max(2, Math.floor(w / 26));
    const rows = Math.max(2, Math.floor(h / 30));
    let wins = "";
    for (let i = 0; i < cols; i++) {
        for (let j = 0; j < rows; j++) {
            if (r() < 0.25) continue; // 部分窗户熄灭，更像真实夜景/黄昏
            wins += `<rect x="${(x + 8 + i * ((w - 16) / cols)).toFixed(1)}" y="${(baseY - h + 10 + j * ((h - 18) / rows)).toFixed(1)}" width="${(((w - 16) / cols) - 6).toFixed(1)}" height="${(((h - 18) / rows) - 8).toFixed(1)}" fill="${winFill}"/>`;
        }
    }
    return `<rect x="${x}" y="${baseY - h}" width="${w}" height="${h}" rx="2" fill="${fill}"/>${wins}`;
}

/** 一棵树（圆形树冠 + 矩形树干） */
function tree(x, baseY, scale, leaf, trunk) {
    const r = 16 * scale;
    return `<rect x="${x - 2.5 * scale}" y="${baseY - 22 * scale}" width="${5 * scale}" height="${22 * scale}" fill="${trunk}"/>
  <circle cx="${x}" cy="${baseY - 30 * scale}" r="${r}" fill="${leaf}"/>
  <circle cx="${x - 11 * scale}" cy="${baseY - 24 * scale}" r="${r * 0.72}" fill="${leaf}"/>
  <circle cx="${x + 11 * scale}" cy="${baseY - 25 * scale}" r="${r * 0.78}" fill="${leaf}"/>`;
}

/** 山峦剪影（两座） */
function mountains(w, baseY, c1, c2, r) {
    const x1 = w * (0.05 + r() * 0.2);
    const x2 = w * (0.55 + r() * 0.25);
    const m1 = `M ${x1} ${baseY} L ${x1 + w * 0.22} ${baseY - 90 - r() * 70} L ${x1 + w * 0.46} ${baseY} Z`;
    const m2 = `M ${x2} ${baseY} L ${x2 + w * 0.2} ${baseY - 70 - r() * 60} L ${x2 + w * 0.42} ${baseY} Z`;
    return `<path d="${m1}" fill="${c1}"/><path d="${m2}" fill="${c2}"/>`;
}

/** 云（椭圆组） */
function cloud(cx, cy, scale, fill) {
    return `<g fill="${fill}">
  <ellipse cx="${cx}" cy="${cy}" rx="${38 * scale}" ry="${14 * scale}"/>
  <ellipse cx="${cx - 24 * scale}" cy="${cy + 4 * scale}" rx="${26 * scale}" ry="${10 * scale}"/>
  <ellipse cx="${cx + 26 * scale}" cy="${cy + 3 * scale}" rx="${28 * scale}" ry="${11 * scale}"/>
  </g>`;
}

/** 完整校园场景（黄昏/清晨/白天三种氛围可选） */
function campusScene(name, w, h, palette, opts = {}) {
    const seed = hashCode(name);
    const r = rng(seed);
    const p = {
        sky1: palette[0], sky2: palette[1],
        sun: palette[2] || "#fff",
        far: palette[3] || "rgba(255,255,255,0.28)",
        near: palette[4] || "rgba(20,40,70,0.35)",
        ground: palette[5] || "#2c4a6e",
        water: palette[6] || null,
        building: palette[7] || "rgba(16,34,60,0.85)",
        win: palette[8] || "rgba(255,224,150,0.9)",
        leaf: palette[9] || "rgba(46,94,60,0.9)",
        trunk: palette[10] || "rgba(66,48,30,0.9)",
        cloud: palette[11] || "rgba(255,255,255,0.5)",
    };
    const horizon = h * (opts.horizon || 0.72);
    let out = `<svg xmlns="http://www.w3.org/2000/svg" width="${w}" height="${h}" viewBox="0 0 ${w} ${h}">
  <defs>
    <linearGradient id="sky-${seed}" x1="0" y1="0" x2="0" y2="1">
      <stop offset="0" stop-color="${p.sky1}"/><stop offset="1" stop-color="${p.sky2}"/>
    </linearGradient>
    <linearGradient id="water-${seed}" x1="0" y1="0" x2="0" y2="1">
      <stop offset="0" stop-color="${p.sky2}" stop-opacity="0.9"/><stop offset="1" stop-color="${p.ground}" stop-opacity="0.95"/>
    </linearGradient>
  </defs>
  <rect width="${w}" height="${h}" fill="url(#sky-${seed})"/>`;
    // 太阳/月亮
    out += `<circle cx="${(w * (0.15 + r() * 0.7)).toFixed(0)}" cy="${(horizon * (0.35 + r() * 0.3)).toFixed(0)}" r="${(h * 0.07).toFixed(0)}" fill="${p.sun}" opacity="0.9"/>`;
    // 云
    out += cloud(w * (0.12 + r() * 0.25), h * (0.12 + r() * 0.15), 0.9 + r() * 0.5, p.cloud);
    out += cloud(w * (0.6 + r() * 0.3), h * (0.08 + r() * 0.12), 0.7 + r() * 0.4, p.cloud);
    // 远山
    out += mountains(w, horizon, p.far, p.far, r);
    // 教学楼主群（画面中偏右）
    const groundY = opts.water ? horizon + (h - horizon) * 0.42 : horizon;
    const bx = w * (opts.buildingX || 0.42);
    out += building(bx, groundY, w * 0.11, (h - groundY) * (1.15 + r() * 0.5), p.building, p.win, r);
    out += building(bx + w * 0.115, groundY, w * 0.075, (h - groundY) * (0.85 + r() * 0.3), p.building, p.win, r);
    out += building(bx - w * 0.062, groundY, w * 0.058, (h - groundY) * (0.7 + r() * 0.25), p.building, p.win, r);
    // 钟楼（细高塔 + 尖顶）
    const tx = bx + w * 0.2;
    const th = (h - groundY) * (1.5 + r() * 0.3);
    out += `<rect x="${tx}" y="${groundY - th}" width="${w * 0.028}" height="${th}" fill="${p.building}"/>
  <rect x="${tx + w * 0.004}" y="${groundY - th + 10}" width="${w * 0.02}" height="${w * 0.02}" fill="${p.win}"/>
  <path d="M ${tx - w * 0.004} ${groundY - th} L ${tx + w * 0.014} ${groundY - th - h * 0.05} L ${tx + w * 0.032} ${groundY - th} Z" fill="${p.building}"/>`;
    // 地面
    if (opts.water) {
        out += `<rect x="0" y="${horizon}" width="${w}" height="${groundY - horizon}" fill="url(#water-${seed})"/>`;
        out += `<rect x="0" y="${groundY}" width="${w}" height="${h - groundY}" fill="${p.ground}"/>`;
        // 水面倒影横线
        for (let i = 0; i < 5; i++) {
            out += `<rect x="${(w * (0.1 + r() * 0.7)).toFixed(0)}" y="${(horizon + (groundY - horizon) * (0.2 + i * 0.16)).toFixed(0)}" width="${(w * (0.06 + r() * 0.2)).toFixed(0)}" height="2" fill="rgba(255,255,255,0.25)"/>`;
        }
    } else {
        out += `<rect x="0" y="${horizon}" width="${w}" height="${h - horizon}" fill="${p.ground}"/>`;
    }
    // 行道树
    const treeY = opts.water ? groundY + (h - groundY) * 0.22 : horizon + (h - horizon) * 0.18;
    for (let i = 0; i < 6; i++) {
        const tx2 = w * (0.03 + i * 0.165 + r() * 0.04);
        if (tx2 > bx - w * 0.08 && tx2 < tx + w * 0.05 && !opts.water) continue; // 避开建筑
        out += tree(tx2, treeY, 1 + r() * 0.5, p.leaf, p.trunk);
    }
    // 前景草坪弧线
    out += `<path d="M 0 ${h} Q ${w / 2} ${h - h * 0.08} ${w} ${h} Z" fill="rgba(0,0,0,0.12)"/>`;
    out += `</svg>`;
    return out;
}

/** 校徽（圆形徽章：书本 + 星 + 环形留白，透明背景适配页头） */
function emblem() {
    return `<svg xmlns="http://www.w3.org/2000/svg" width="96" height="96" viewBox="0 0 96 96">
  <defs><linearGradient id="lg" x1="0" y1="0" x2="1" y2="1">
    <stop offset="0" stop-color="#2a6fc9"/><stop offset="1" stop-color="#12447f"/>
  </linearGradient></defs>
  <circle cx="48" cy="48" r="46" fill="url(#lg)"/>
  <circle cx="48" cy="48" r="38.5" fill="none" stroke="#f5c542" stroke-width="1.6"/>
  <circle cx="48" cy="48" r="41.5" fill="none" stroke="#ffffff" stroke-width="0.8" opacity="0.6"/>
  <path d="M 26 58 Q 48 50 70 58 L 70 36 Q 48 28 26 36 Z" fill="#ffffff"/>
  <path d="M 48 50 L 48 28" stroke="#2a6fc9" stroke-width="1.6"/>
  <path d="M 48 14 L 50.6 21 L 58 21.4 L 52.2 26 L 54.2 33 L 48 29 L 41.8 33 L 43.8 26 L 38 21.4 L 45.4 21 Z" fill="#f5c542"/>
  <rect x="24" y="62" width="48" height="3.4" rx="1.7" fill="#f5c542"/>
</svg>`;
}

/* ---- 轮播（1920×560，对齐 theme.json bannerSize 约定）---- */
fs.writeFileSync(path.join(OUT, "banner-1.svg"),
    campusScene("banner-1", 1920, 560, ["#1c3f68", "#7fb2e5", "#fff2c9", "rgba(255,255,255,0.22)", "rgba(20,45,80,0.30)", "#27517f"], { water: true, buildingX: 0.40 }));
fs.writeFileSync(path.join(OUT, "banner-2.svg"),
    campusScene("banner-2", 1920, 560, ["#0e4f4a", "#8fd0b0", "#fdeec1", "rgba(255,255,255,0.20)", "rgba(10,60,50,0.32)", "#1f6b52", "#2f8a68", "rgba(8,52,44,0.88)", "rgba(255,240,190,0.92)", "rgba(24,92,64,0.95)", "rgba(52,40,24,0.95)", "rgba(255,255,255,0.42)"], { water: true, buildingX: 0.46 }));
fs.writeFileSync(path.join(OUT, "banner-3.svg"),
    campusScene("banner-3", 1920, 560, ["#3a1f5d", "#e08a6d", "#ffd9a0", "rgba(255,214,170,0.30)", "rgba(52,24,70,0.38)", "#4a2a63", "#6b3d84", "rgba(30,14,48,0.9)", "rgba(255,226,170,0.95)", "rgba(96,60,110,0.9)", "rgba(50,32,24,0.9)", "rgba(255,235,210,0.4)"], { horizon: 0.78, buildingX: 0.36 }));
fs.writeFileSync(path.join(OUT, "banner-4.svg"),
    campusScene("banner-4", 1920, 560, ["#141c3a", "#4f7fd9", "#cfe0ff", "rgba(190,210,255,0.20)", "rgba(12,20,48,0.42)", "#1b2a52"], { horizon: 0.75, buildingX: 0.44 }));

/* ---- 文章封面（640×360）---- */
fs.writeFileSync(path.join(OUT, "cover-运动会.svg"),
    campusScene("cover-sports", 640, 360, ["#0d3b66", "#69a8d8", "#fff3c4", "rgba(255,255,255,0.24)", "rgba(10,40,70,0.34)", "#1c5080", "#2e6da4", "rgba(10,34,62,0.9)", "rgba(255,230,160,0.92)", "rgba(30,90,70,0.95)", "rgba(50,38,22,0.95)", "rgba(255,255,255,0.5)"], { water: true }));
fs.writeFileSync(path.join(OUT, "cover-迎新晚会.svg"),
    campusScene("cover-gala", 640, 360, ["#2a0e4e", "#c25b8a", "#ffe3a0", "rgba(255,200,220,0.26)", "rgba(40,12,64,0.4)", "#3c1a5c", "#57297a", "rgba(26,8,44,0.92)", "rgba(255,224,170,0.95)", "rgba(120,60,130,0.9)", "rgba(48,30,20,0.9)", "rgba(255,230,240,0.4)"], { horizon: 0.8, buildingX: 0.42 }));
fs.writeFileSync(path.join(OUT, "cover-创新创业.svg"),
    campusScene("cover-inno", 640, 360, ["#03363d", "#4fd1c5", "#eafff9", "rgba(220,255,250,0.22)", "rgba(4,50,56,0.36)", "#065a63", "#0b7d85", "rgba(4,42,48,0.9)", "rgba(210,255,245,0.92)", "rgba(10,92,80,0.9)", "rgba(40,40,22,0.9)", "rgba(235,255,252,0.4)"], { water: true }));

/* ---- 正文配图（640×360）---- */
["art-1", "art-2", "art-3", "art-4", "art-5", "art-6"].forEach((n, i) => {
    const palettes = [
        ["#1c3f68", "#7fb2e5", "#fff2c9", "rgba(255,255,255,0.22)", "rgba(20,45,80,0.30)", "#27517f"],
        ["#5d2019", "#e8a06a", "#fff0d0", "rgba(255,220,190,0.26)", "rgba(80,28,20,0.34)", "#7a3020", null, "rgba(70,24,16,0.9)", "rgba(255,235,200,0.92)", "rgba(160,70,40,0.9)", "rgba(56,36,20,0.9)", "rgba(255,240,220,0.42)"],
        ["#23306b", "#9fb4f0", "#f4f6ff", "rgba(230,235,255,0.24)", "rgba(24,32,86,0.32)", "#303f8c", "#4653a3", "rgba(18,24,66,0.9)", "rgba(235,240,255,0.92)", "rgba(50,70,140,0.9)", "rgba(44,36,26,0.9)", "rgba(245,248,255,0.45)"],
        ["#0e4f4a", "#8fd0b0", "#fdeec1", "rgba(255,255,255,0.20)", "rgba(10,60,50,0.32)", "#1f6b52", "#2f8a68", "rgba(8,52,44,0.88)", "rgba(255,240,190,0.92)", "rgba(24,92,64,0.95)", "rgba(52,40,24,0.95)", "rgba(255,255,255,0.42)"],
        ["#4a2a63", "#d9a0c8", "#ffe9f4", "rgba(255,230,245,0.24)", "rgba(60,32,82,0.34)", "#5c3675", "#754a8e", "rgba(44,22,60,0.9)", "rgba(255,235,245,0.92)", "rgba(110,70,120,0.9)", "rgba(50,32,22,0.9)", "rgba(255,245,250,0.42)"],
        ["#3d2b1f", "#d9b38c", "#fff6e3", "rgba(255,240,215,0.24)", "rgba(60,42,28,0.36)", "#5a4030", "#71523c", "rgba(52,36,24,0.9)", "rgba(255,240,210,0.92)", "rgba(120,90,50,0.9)", "rgba(46,32,18,0.9)", "rgba(255,250,235,0.42)"],
    ];
    fs.writeFileSync(path.join(OUT, n + ".svg"), campusScene(n, 640, 360, palettes[i], { water: i % 2 === 0 }));
});

/* ---- 校徽 + 友链 logo ---- */
fs.writeFileSync(path.join(OUT, "logo-univ.svg"), emblem());
for (let i = 1; i <= 8; i++) {
    const hues = [210, 160, 20, 270, 120, 340, 40, 190];
    const hue = hues[i - 1];
    fs.writeFileSync(path.join(OUT, `logo-${i}.svg`), `<svg xmlns="http://www.w3.org/2000/svg" width="96" height="96" viewBox="0 0 96 96">
  <rect x="4" y="4" width="88" height="88" rx="18" fill="hsl(${hue},52%,46%)"/>
  <rect x="4" y="4" width="88" height="88" rx="18" fill="none" stroke="rgba(255,255,255,0.35)" stroke-width="2"/>
  <circle cx="48" cy="38" r="15" fill="rgba(255,255,255,0.9)"/>
  <path d="M 24 74 Q 48 46 72 74 Z" fill="rgba(255,255,255,0.75)"/>
</svg>`);
}

/* ---- 最小 PDF（附件） ---- */
function miniPdf(title) {
    const text = `BT /F1 18 Tf 60 700 Td (${title}) Tj ET`;
    const content = `1 0 0 1 0 0 cm\n${text}`;
    const objs = [
        "<< /Type /Catalog /Pages 2 0 R >>",
        "<< /Type /Pages /Kids [3 0 R] /Count 1 >>",
        "<< /Type /Page /Parent 2 0 R /MediaBox [0 0 595 842] /Contents 4 0 R /Resources << /Font << /F1 5 0 R >> >> >>",
        `<< /Length ${content.length} >>\nstream\n${content}\nendstream`,
        "<< /Type /Font /Subtype /Type1 /BaseFont /Helvetica >>",
    ];
    let pdf = "%PDF-1.4\n";
    const offsets = [];
    objs.forEach((o, i) => {
        offsets.push(pdf.length);
        pdf += `${i + 1} 0 obj\n${o}\nendobj\n`;
    });
    const xref = pdf.length;
    pdf += `xref\n0 ${objs.length + 1}\n0000000000 65535 f \n`;
    offsets.forEach(off => {
        pdf += String(off).padStart(10, "0") + " 00000 n \n";
    });
    pdf += `trailer\n<< /Size ${objs.length + 1} /Root 1 0 R >>\nstartxref\n${xref}\n%%EOF`;
    return Buffer.from(pdf, "latin1");
}
fs.writeFileSync(path.join(OUT, "2026校历.pdf"), miniPdf("2026 QiulixiaoLi (seed)"));
fs.writeFileSync(path.join(OUT, "运动会秩序册.pdf"), miniPdf("YunDongHui ZhiXuCe (seed)"));
fs.writeFileSync(path.join(OUT, "迎新晚会节目单.pdf"), miniPdf("YingXin WanHui (seed)"));

console.log("seed assets written to", OUT, ":", fs.readdirSync(OUT).length, "files");