import type {
  ElyAnalyticsDataPoint,
  ElyD1Database,
  ElyD1PreparedStatement,
  ElyR2PutOptions,
  Env,
} from "../src/bindings.js";

export const ACCESS_TOKEN = "D".repeat(48);
export const PUBLIC_KEY = "a".repeat(64);

export interface TestEnvOptions {
  auditEvents?: ElyAnalyticsDataPoint[];
  diagnosticEvents?: ElyAnalyticsDataPoint[];
  d1?: RecordedD1Database;
  kvEntries?: [string, string][];
  kvDeletes?: string[];
  kvPuts?: [string, string][];
  kvReads?: string[];
  r2Deletes?: string[];
  r2Gets?: string[];
  r2Objects?: [string, ArrayBuffer][];
  r2Puts?: RecordedR2Put[];
}

export interface RecordedD1Database extends ElyD1Database {
  batches: number[];
  binds: unknown[][];
  queries: string[];
}

export interface RecordedR2Put {
  key: string;
  payload: ArrayBuffer;
  options: ElyR2PutOptions;
}

interface TestD1DatabaseOptions {
  allRows?: unknown[];
  firstRows?: unknown[];
}

export function testEnv(options: TestEnvOptions): Env {
  const values = new Map(options.kvEntries ?? []);
  return {
    ELY_ENVIRONMENT: "local",
    ELY_AUTH_BASE_URL: "https://elydora.test",
    ELY_AUTH_SECRET: "test-auth-secret-for-worker-routes",
    ELY_DB: options.d1 ?? testD1Database([]),
    ELY_KV: {
      get(key: string): Promise<string | null> {
        options.kvReads?.push(key);
        return Promise.resolve(values.get(key) ?? null);
      },
      put(key: string, value: string): Promise<void> {
        options.kvPuts?.push([key, value]);
        values.set(key, value);
        return Promise.resolve();
      },
      delete(key: string): Promise<void> {
        options.kvDeletes?.push(key);
        values.delete(key);
        return Promise.resolve();
      },
    },
    ELY_STORAGE: testR2Bucket(
      options.r2Puts,
      options.r2Objects,
      options.r2Gets,
      options.r2Deletes,
    ),
    ELY_RATE_LIMITER: {
      limit(): Promise<{ success: boolean }> {
        return Promise.resolve({ success: true });
      },
    },
    ELY_API_AUDIT: {
      writeDataPoint(event?: ElyAnalyticsDataPoint): void {
        if (event !== undefined) {
          options.auditEvents?.push(event);
        }
      },
    },
    ELY_DIAGNOSTICS: {
      writeDataPoint(event?: ElyAnalyticsDataPoint): void {
        if (event !== undefined) {
          options.diagnosticEvents?.push(event);
        }
      },
    },
  };
}

export function testD1Database(rows: unknown[] | TestD1DatabaseOptions): RecordedD1Database {
  const binds: unknown[][] = [];
  const batches: number[] = [];
  const queries: string[] = [];
  const allRows = Array.isArray(rows) ? rows : rows.allRows ?? [];
  const firstRows = Array.isArray(rows) ? rows : rows.firstRows ?? [];
  let firstIndex = 0;
  return {
    batches,
    binds,
    queries,
    prepare(query: string) {
      queries.push(query);
      return testD1PreparedStatement(allRows, firstRows, () => firstIndex++, binds);
    },
    batch(statements: ElyD1PreparedStatement[]) {
      batches.push(statements.length);
      return Promise.resolve([]);
    },
    exec() {
      return Promise.resolve({});
    },
  };
}

export function sessionDocument(deviceId: string | null = "device-01"): string {
  return JSON.stringify({
    version: 1,
    user_id: "user-01",
    session_id: "session-01",
    ...(deviceId === null ? {} : { device_id: deviceId }),
    expires_at: "2099-01-01T00:00:00.000Z",
  });
}

function testD1PreparedStatement(
  allRows: unknown[],
  firstRows: unknown[],
  nextFirstIndex: () => number,
  binds: unknown[][],
): ElyD1PreparedStatement {
  return {
    bind(...values: unknown[]) {
      binds.push(values);
      return this;
    },
    first<T>() {
      return Promise.resolve((firstRows[nextFirstIndex()] as T | undefined) ?? null);
    },
    all<T>() {
      return Promise.resolve({ results: allRows as T[] });
    },
    run() {
      return Promise.resolve({});
    },
  };
}

function testR2Bucket(
  puts: RecordedR2Put[] = [],
  objects: [string, ArrayBuffer][] = [],
  gets: string[] = [],
  deletes: string[] = [],
): Env["ELY_STORAGE"] {
  const values = new Map(objects);
  return {
    get(key: string) {
      gets.push(key);
      const value = values.get(key);
      if (value === undefined) {
        return Promise.resolve(null);
      }
      return Promise.resolve({
        arrayBuffer() {
          return Promise.resolve(value);
        },
      });
    },
    put(key: string, value: ArrayBuffer, options: ElyR2PutOptions = {}) {
      puts.push({ key, payload: value, options });
      values.set(key, value);
      return Promise.resolve({
        arrayBuffer() {
          return Promise.resolve(value);
        },
      });
    },
    delete(key: string) {
      deletes.push(key);
      values.delete(key);
      return Promise.resolve();
    },
  };
}