import { createHash } from "node:crypto";
import { fromManifest, type SkillSource } from "agents/skills";
import * as Effect from "effect/Effect";
import type { InstalledSkills } from "./installed-skills";

// The public SDK source interface lets SQLite supply discovery while R2 supplies
// package bytes lazily. Native fromManifest owns content/resource projection.
export function installedSkillSource(store: InstalledSkills): SkillSource {
  const id = "flarebot-installed";
  const visible = store.list().filter((skill) => skill.enabled);
  const source = (name: string) =>
    Effect.gen(function* () {
      const expected = visible.find((skill) => skill.name === name);
      if (!expected) return null;
      const loaded = yield* store.load(name);
      if (
        !loaded?.enabled ||
        loaded.revision !== expected.revision ||
        loaded.fingerprint !== expected.fingerprint
      )
        return null;
      return fromManifest({
        id,
        fingerprint: loaded.fingerprint,
        skills: [loaded.entry],
      });
    });
  return {
    id,
    fingerprint: createHash("sha256")
      .update(
        JSON.stringify(
          visible.map((skill) => [
            skill.name,
            skill.fingerprint,
            skill.revision,
          ]),
        ),
      )
      .digest("hex"),
    list() {
      return Promise.resolve(
        visible.map((skill) => ({
          name: skill.name,
          description: skill.description,
          version: skill.version,
          sourceId: id,
        })),
      );
    },
    load(name) {
      return Effect.runPromise(
        source(name).pipe(
          Effect.flatMap((native) =>
            native
              ? Effect.promise(() => native.load(name))
              : Effect.succeed(null),
          ),
        ),
      );
    },
    readResource(name, path) {
      return Effect.runPromise(
        source(name).pipe(
          Effect.flatMap((native) =>
            native
              ? Effect.promise(() => native.readResource!(name, path))
              : Effect.succeed(null),
          ),
        ),
      );
    },
  };
}