import { ALLOWED_COMMANDS } from "@tasks/shared/worker";
import type { HarnessType } from "@tasks/shared/worker";

export type HarnessConfig = {
  alias: string;
  harnessType: HarnessType;
  needsWorktree: boolean;
  allowedCommands: readonly string[] | null;
  endpointUrl?: string | null;
  authEnvVar?: string | null;
};

const DOC_WRITER: HarnessConfig = {
  alias: "doc-writer",
  harnessType: "minimal",
  needsWorktree: false,
  allowedCommands: [],
};

const DEFAULT: HarnessConfig = {
  alias: "minimal",
  harnessType: "minimal",
  needsWorktree: true,
  allowedCommands: null,
};

const HARNESS_DEFAULTS: Record<string, Partial<HarnessConfig>> = {
  minimal: { harnessType: "minimal", needsWorktree: true, allowedCommands: null },
  crewai: { harnessType: "crewai", needsWorktree: true, allowedCommands: null },
  langgraph: { harnessType: "langgraph", needsWorktree: true, allowedCommands: null },
  "remote-ag-ui": { harnessType: "remote-ag-ui", needsWorktree: false, allowedCommands: [] },
};

const HARNESS_BY_ALIAS: Record<string, HarnessConfig> = {
  "doc-writer": DOC_WRITER,
  minimal: DEFAULT,
  default: DEFAULT,
};

function configForAlias(alias: string): HarnessConfig {
  if (HARNESS_BY_ALIAS[alias]) return HARNESS_BY_ALIAS[alias]!;
  const def = HARNESS_DEFAULTS[alias] as Partial<HarnessConfig> | undefined;
  if (def?.harnessType) {
    return {
      alias,
      harnessType: def.harnessType,
      needsWorktree: def.needsWorktree ?? true,
      allowedCommands: def.allowedCommands ?? null,
    };
  }
  return { alias, harnessType: "minimal", needsWorktree: true, allowedCommands: null };
}

/**
 * Resolve harness config for a job. Brief 3 adds harness_providers + remote-ag-ui.
 * - If job carries `harnessAlias` use it (from orchestrator or DB route).
 * - Else if roleId itself is a harness alias use it.
 * - Else fallback to minimal.
 */
export function resolveHarnessForJob(job: {
  roleId: string;
  harnessAlias?: string | null;
  harnessType?: string | null;
  endpointUrl?: string | null;
  authEnvVar?: string | null;
}): HarnessConfig {
  const alias = job.harnessAlias ?? (HARNESS_BY_ALIAS[job.roleId] ? job.roleId : null);
  if (alias) {
    const base = configForAlias(alias);
    return {
      ...base,
      ...(job.harnessType ? { harnessType: job.harnessType as HarnessType } : {}),
      ...(job.endpointUrl !== undefined ? { endpointUrl: job.endpointUrl } : {}),
      ...(job.authEnvVar !== undefined ? { authEnvVar: job.authEnvVar } : {}),
    };
  }
  if (job.roleId.includes("doc")) return DOC_WRITER;
  return DEFAULT;
}

export function allowedCommandsForHarness(harness: HarnessConfig): readonly string[] | null {
  return harness.allowedCommands === null ? ALLOWED_COMMANDS : harness.allowedCommands;
}

/**
 * Executor registry — minimal adapter delegates to MinimalSession; remote adapters
 * could call AG-UI endpoint. For brief 3 all adapters share the same local
 * MinimalSession implementation but are differentiated by harnessType for
 * observability and future extension.
 */
export function getHarnessExecutor(alias: string): { id: string; harnessType: HarnessType } {
  const cfg = configForAlias(alias);
  return { id: cfg.alias, harnessType: cfg.harnessType };
}