/**
 * migrate-featured.ts — 精选故事迁移脚本
 *
 * 从 app/page.tsx 的 STORIES 常量生成 featured_stories INSERT SQL。
 * 输出 SQL 到 stdout（可通过 wrangler d1 execute 导入），或 --dry-run 预览。
 *
 * Usage:
 *   npx tsx scripts/migrate-featured.ts > drizzle/seed-featured.sql
 *   npx tsx scripts/migrate-featured.ts --dry-run
 *   wrangler d1 execute infiplot-db --file=drizzle/seed-featured.sql
 */

import { readFileSync } from "node:fs";
import { join } from "node:path";

const DRY_RUN = process.argv.includes("--dry-run");

// ── Parse STORIES from app/page.tsx ──────────────────────────────────────

type StoryContent = { title: string; outline: string; style: string; tags: string[] };

function extractStories(): Record<"男性向" | "女性向", StoryContent[]> {
  const src = readFileSync(join(process.cwd(), "app/page.tsx"), "utf-8");

  const startIdx = src.indexOf("const STORIES:");
  if (startIdx === -1) throw new Error("Cannot find 'const STORIES:' in app/page.tsx");

  const eqIdx = src.indexOf("= {", startIdx);
  if (eqIdx === -1) throw new Error("Cannot find STORIES assignment");

  let braceCount = 0;
  let objStart = -1;
  for (let i = eqIdx + 2; i < src.length; i++) {
    if (src[i] === "{") {
      if (objStart === -1) objStart = i;
      braceCount++;
    } else if (src[i] === "}") {
      braceCount--;
      if (braceCount === 0) {
        const objStr = src.slice(objStart, i + 1);
        // CR-11: Convert JS object literal to JSON safely (no eval/Function)
        // 1. Wrap unquoted keys in double-quotes (中文 and ASCII keys)
        // 2. Replace single-quotes with double-quotes
        // 3. Remove trailing commas before } or ]
        const jsonStr = objStr
          .replace(/^\s*([\w一-鿿]+)\s*:/gm, '"$1":')  // unquoted keys → quoted
          .replace(/'/g, '"')                                     // single → double quotes
          .replace(/,\s*([}\]])/g, "$1");                         // trailing commas
        try {
          return JSON.parse(jsonStr) as Record<"男性向" | "女性向", StoryContent[]>;
        } catch (parseErr) {
          throw new Error(`Failed to parse STORIES as JSON: ${(parseErr as Error).message}. Consider extracting STORIES to a standalone JSON file.`);
        }
      }
    }
  }
  throw new Error("Cannot parse STORIES object — unbalanced braces");
}

// ── Parse DISPLAY_ORDER from app/page.tsx ────────────────────────────────

function extractDisplayOrder(): Record<"男性向" | "女性向", number[]> {
  const src = readFileSync(join(process.cwd(), "app/page.tsx"), "utf-8");

  const startIdx = src.indexOf("const DISPLAY_ORDER:");
  if (startIdx === -1) throw new Error("Cannot find 'const DISPLAY_ORDER:' in app/page.tsx");

  const eqIdx = src.indexOf("= {", startIdx);
  if (eqIdx === -1) throw new Error("Cannot find DISPLAY_ORDER assignment");

  let braceCount = 0;
  let objStart = -1;
  for (let i = eqIdx + 2; i < src.length; i++) {
    if (src[i] === "{") {
      if (objStart === -1) objStart = i;
      braceCount++;
    } else if (src[i] === "}") {
      braceCount--;
      if (braceCount === 0) {
        const objStr = src.slice(objStart, i + 1);
        const fn = new Function(`return (${objStr})`);
        return fn() as Record<"男性向" | "女性向", number[]>;
      }
    }
  }
  throw new Error("Cannot parse DISPLAY_ORDER object — unbalanced braces");
}

// ── Generate SQL ─────────────────────────────────────────────────────────

function escSql(s: string): string {
  return s.replace(/'/g, "''");
}

function generateSql(): string {
  const stories = extractStories();
  const displayOrder = extractDisplayOrder();

  const lines: string[] = [
    "-- Auto-generated by scripts/migrate-featured.ts",
    "-- Idempotent: uses INSERT OR REPLACE",
    "",
    "DELETE FROM featured_stories;",
    "",
  ];

  const genderMap: Record<string, string> = { "男性向": "male", "女性向": "female" };
  const prefixMap: Record<string, string> = { "男性向": "m", "女性向": "f" };

  for (const [genderCn, storyList] of Object.entries(stories)) {
    const gender = genderMap[genderCn]!;
    const prefix = prefixMap[genderCn]!;
    const order = displayOrder[genderCn as keyof typeof displayOrder] ?? Array.from({ length: storyList.length }, (_, i) => i);

    // Generate a sortOrder for each story based on its position in DISPLAY_ORDER
    const sortOrderMap = new Map<number, number>();
    for (let sortPos = 0; sortPos < order.length; sortPos++) {
      sortOrderMap.set(order[sortPos]!, sortPos);
    }

    for (let i = 0; i < storyList.length; i++) {
      const s = storyList[i]!;
      const id = `${prefix}${i}`;
      const sortOrder = sortOrderMap.get(i) ?? i;
      const coverPath = `/home/${id}.webp`;
      const firstactPath = `/home/firstact/${id}.json`;
      const firstscenePath = `/home/firstscene/${id}.webp`;
      const tagsJson = JSON.stringify(s.tags);

      lines.push(
        `INSERT OR REPLACE INTO featured_stories (id, gender, title, outline, style, tags, cover_path, firstact_path, firstscene_path, sort_order, is_active, click_count, created_at)` +
        ` VALUES ('${escSql(id)}', '${gender}', '${escSql(s.title)}', '${escSql(s.outline)}', '${escSql(s.style)}', '${escSql(tagsJson)}', '${escSql(coverPath)}', '${escSql(firstactPath)}', '${escSql(firstscenePath)}', ${sortOrder}, 1, 0, unixepoch());`,
      );
    }
    lines.push("");
  }

  return lines.join("\n");
}

// ── Main ─────────────────────────────────────────────────────────────────

try {
  const sql = generateSql();

  if (DRY_RUN) {
    console.log("=== DRY RUN — SQL preview (not executing) ===\n");
    console.log(sql);
    console.log("\n=== END DRY RUN ===");
    console.log(`\nTotal: ${sql.split("INSERT").length - 1} records`);
  } else {
    process.stdout.write(sql);
  }
} catch (err) {
  console.error("Migration script failed:", err instanceof Error ? err.message : err);
  process.exit(1);
}