import fs from "fs";
import { globSync } from "glob";
import path from "path";

type Nation = {
  flag?: string;
};

type Manifest = {
  nations?: Nation[];
};

describe("Map manifests: nation flags exist", () => {
  test("All nations' flags reference existing SVG files", () => {
    const manifestPaths = globSync("resources/maps/**/manifest.json");

    expect(manifestPaths.length).toBeGreaterThan(0);

    const flagDir = path.join(__dirname, "../resources/flags");
    const errors: string[] = [];

    for (const manifestPath of manifestPaths) {
      try {
        const raw = fs.readFileSync(manifestPath, "utf8");
        const manifest = JSON.parse(raw) as Manifest;

        (manifest.nations ?? []).forEach((nation, idx) => {
          const flag = nation?.flag;
          if (flag === undefined || flag === null) return;
          if (typeof flag !== "string") {
            errors.push(
              `${manifestPath} -> nations[${idx}].flag is not a string`,
            );
            return;
          }

          if (flag.trim().length === 0) return;
          if (flag.startsWith("!")) return;

          const svgFile = flag.endsWith(".svg") ? flag : `${flag}.svg`;
          const flagPath = path.join(flagDir, svgFile);
          if (!fs.existsSync(flagPath)) {
            errors.push(
              `${manifestPath} -> nations[${idx}].flag "${flag}" does not exist in resources/flags`,
            );
          }
        });
      } catch (err) {
        errors.push(
          `Failed to parse ${manifestPath}: ${(err as Error).message}`,
        );
      }
    }

    if (errors.length > 0) {
      throw new Error(
        "Map manifest flag file violations:\n" + errors.join("\n"),
      );
    }
  });
});