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import type { ZodType, ZodTypeDef } from "zod";
import type { SourceKind } from "@/lib/schemas/source";
import { sourceModules } from "./modules";

// Context handed to a source's fetch(). `config` is the per-source config object
// (already validated by configSchema); `env` is process.env for credentials.
export interface SourceFetchContext<Config = unknown> {
  config: Config;
  env: NodeJS.ProcessEnv;
  signal?: AbortSignal;
}

// A source module = how to fetch + validate + describe one kind of data.
// The dashboard card and edition section render the payload separately.
export interface SourceModule<Config = unknown, Payload = unknown> {
  kind: SourceKind;
  label: string;
  // true => works with zero credentials (weather, news, onthisday, obsidian).
  keyless: boolean;
  defaultRefreshSeconds: number;
  // input param is `any` because schemas use .default(), so input ≠ output type.
  configSchema: ZodType<Config, ZodTypeDef, any>;
  payloadSchema: ZodType<Payload, ZodTypeDef, any>;
  // Throws on failure; caller records ok:false + the error message.
  fetch(ctx: SourceFetchContext<Config>): Promise<Payload>;
  // Returns false when required creds/config are missing → card shows "needs config".
  isConfigured?(config: Config, env: NodeJS.ProcessEnv): boolean;
}

const REGISTRY = new Map<SourceKind, SourceModule>(
  sourceModules.map((m) => [m.kind, m as SourceModule]),
);

export function getSourceModule(kind: SourceKind): SourceModule | undefined {
  return REGISTRY.get(kind);
}

export function allSourceModules(): SourceModule[] {
  return [...REGISTRY.values()];
}

export function isSourceConfigured(
  kind: SourceKind,
  config: unknown,
  env: NodeJS.ProcessEnv = process.env,
): boolean {
  const mod = REGISTRY.get(kind);
  if (!mod) return true; // local kinds (e.g. todos) need no config
  const parsed = mod.configSchema.safeParse(config ?? {});
  const cfg = parsed.success ? parsed.data : ({} as unknown);
  return mod.isConfigured ? mod.isConfigured(cfg, env) : true;
}