import { END } from "@uncaged/nerve-core";
import type { Moderator } from "@uncaged/nerve-core";
import type { PlannerMeta } from "./roles/planner/index.js";
import type { CoderMeta } from "./roles/coder/index.js";
import type { ReviewerMeta } from "./roles/reviewer/index.js";
import type { TesterMeta } from "./roles/tester/index.js";
import type { CommitterMeta } from "./roles/committer/index.js";

export type SenseMeta = {
  planner: PlannerMeta;
  coder: CoderMeta;
  reviewer: ReviewerMeta;
  tester: TesterMeta;
  committer: CommitterMeta;
};

const MAX_CODER_SELF_ITERATIONS = 5;
const MAX_REVIEWER_REJECTIONS = 3;
const MAX_TESTER_REJECTIONS = 3;
const MAX_COMMITTER_REJECTIONS = 2;

function countRejections(steps: { role: string; meta: unknown }[], rejector: string, metaKey: string): number {
  return steps.filter((s) => s.role === rejector && !(s.meta as Record<string, boolean>)[metaKey]).length;
}

function countCoderSelfIterations(steps: { role: string; meta: unknown }[]): number {
  return steps.filter((s) => s.role === "coder" && !(s.meta as Record<string, boolean>).done).length;
}

export const moderator: Moderator<SenseMeta> = (context) => {
  if (context.steps.length === 0) return "planner";

  const last = context.steps[context.steps.length - 1];

  if (last.role === "planner") return "coder";

  if (last.role === "coder") {
    if (last.meta.done) return "reviewer";
    return countCoderSelfIterations(context.steps) < MAX_CODER_SELF_ITERATIONS ? "coder" : END;
  }

  if (last.role === "reviewer") {
    if (last.meta.approved) return "tester";
    return countRejections(context.steps, "reviewer", "approved") < MAX_REVIEWER_REJECTIONS ? "coder" : END;
  }

  if (last.role === "tester") {
    if (last.meta.passed) return "committer";
    return countRejections(context.steps, "tester", "passed") < MAX_TESTER_REJECTIONS ? "coder" : END;
  }

  if (last.role === "committer") {
    if (last.meta.success) return END;
    return countRejections(context.steps, "committer", "success") < MAX_COMMITTER_REJECTIONS ? "coder" : END;
  }

  return END;
};