import { build } from "esbuild";
import { resolve, dirname } from "node:path";
import { readFileSync, readdirSync } from "node:fs";

// A private copy of the existing engine keeps dedicated matches and offline
// practice isolated from the React player's stores. No second spell interpreter.
await build({
  entryPoints: ["scripts/arena-pipeline/combat-runtime.ts"],
  outfile: "server/generated/arena-combat-runtime.mjs",
  bundle: true,
  format: "esm",
  platform: "neutral",
  mainFields: ["module", "main"],
  target: "es2022",
  // Escape catalog line breaks in string literals, preserving tooltip text
  // without generating source lines that end in whitespace.
  supported: { "template-literal": false },
  minify: true,
  define: { "import.meta.env.MODE": '"test"', "import.meta.env.DEV": "false", "import.meta.env.BASE_URL": '"/"', "process.env.NODE_ENV": '"production"' },
  plugins: [{
    name: "arena-engine-host",
    setup(builder) {
      builder.onLoad({ filter: /coaAbilityCatalogLoader\.ts$/ }, ({ path }) => {
        const paths = readdirSync(resolve(dirname(path), "generated/coaAbilities")).filter((name) => name.endsWith(".json"))
          .map((name) => `./generated/coaAbilities/${name}`);
        return { contents: readFileSync(path, "utf8").replace(/import\.meta\.glob<[^>]+>\([^;]+\)/, `{${paths.map((name) => `${JSON.stringify(name)}: () => import(${JSON.stringify(name)})`).join(",")}}`), loader: "ts" };
      });
      builder.onResolve({ filter: /^zustand$/ }, () => ({ path: resolve("scripts/arena-pipeline/runtime-store.ts") }));
      builder.onResolve({ filter: /^\.\/store$/ }, ({ importer }) => importer.endsWith("combatStore.ts") ? ({ path: "game-store", namespace: "arena-host" }) : undefined);
      builder.onResolve({ filter: /^\.\/dungeonEncounterRuntime$/ }, ({ importer }) => importer.endsWith("combatStore.ts") ? ({ path: "encounter", namespace: "arena-host" }) : undefined);
      builder.onResolve({ filter: /^\.\/onlineSessionRuntime$/ }, ({ importer }) => importer.endsWith("combatStore.ts") ? ({ path: "online", namespace: "arena-host" }) : undefined);
      builder.onLoad({ filter: /.*/, namespace: "arena-host" }, ({ path }) => ({ contents: path === "game-store"
        ? 'export const useGameStore = { getState: () => ({ gameMode: "arena" }) };'
        : path === "online" ? 'export const onlinePlayerRuntimeActors = () => []; export const onlinePlayerRuntimeActor = () => null;'
          : 'export const dispatchDungeonEncounterSignal = () => {}; export const dungeonEncounterStateMatches = () => false;', loader: "js" }));
    },
  }],
});