import upath from 'upath';
import type { DeepMockProxy } from 'vitest-mock-extended';
import type { RenovateConfig } from '../lib/config/types.ts';
import * as _logger from '../lib/logger/index.ts';
import type { Platform } from '../lib/modules/platform/index.ts';
import { platform as _platform } from '../lib/modules/platform/index.ts';
import { scm as _scm } from '../lib/modules/platform/scm.ts';
import * as _env from '../lib/util/exec/env.ts';
import * as _fs from '../lib/util/fs/index.ts';
import * as _git from '../lib/util/git/index.ts';
import { hash } from '../lib/util/hash.ts';
import * as _hostRules from '../lib/util/host-rules.ts';
import {
  type LongCommitSha,
  toLongCommitSha,
} from '../lib/util/schema-utils/git.ts';

/**
 * Simple wrapper for getting mocked version of a module
 * @param module module which is mocked by `vitest-mock-extended.mockDeep`
 */
export function mockedExtended<T extends object>(module: T): DeepMockProxy<T> {
  return module as DeepMockProxy<T>;
}

/**
 * Simply wrapper to create partial mocks.
 * @param obj Object to cast to final type
 */
export function partial<T>(): T;
export function partial<T>(obj: Partial<T>): T;
export function partial<T>(obj: Partial<T>[]): T[];
export function partial(obj: unknown = {}): unknown {
  return obj;
}

export const fs = vi.mocked(_fs);
export const git = vi.mocked(_git);

export const platform = vi.mocked(partial<Required<Platform>>(_platform));
export const scm = vi.mocked(_scm);
export const env = vi.mocked(_env);
export const hostRules = vi.mocked(_hostRules);
export const logger = vi.mocked(_logger, true);

export type { RenovateConfig };

function getCallerFileName(): string | null {
  let result: string | null = null;

  const prepareStackTrace = Error.prepareStackTrace;
  const stackTraceLimit = Error.stackTraceLimit;

  Error.prepareStackTrace = (_err, stack) => stack;
  Error.stackTraceLimit = 5; // max calls inside this file + 1

  try {
    const err = new Error();

    const stack = err.stack as unknown as NodeJS.CallSite[];

    let currentFile: string | null = null;
    for (const frame of stack) {
      const fileName = frame.getFileName() ?? null;
      if (!currentFile) {
        currentFile = fileName;
      } else if (currentFile !== fileName) {
        result = fileName;
        break;
      }
    }
  } catch {
    // no-op
  }

  Error.prepareStackTrace = prepareStackTrace;
  Error.stackTraceLimit = stackTraceLimit;

  return result;
}

export function getFixturePath(fixtureFile: string, fixtureRoot = '.'): string {
  const callerDir = upath.dirname(getCallerFileName()!);
  return upath.join(callerDir, fixtureRoot, '__fixtures__', fixtureFile);
}

/**
 * Deterministically derive a valid {@link LongCommitSha} from a seed, for tests.
 * Same seed always yields the same SHA, keeping snapshots stable.
 * Defaults to a 40-char (sha1) hash; pass 'sha256' for a 64-char hash.
 */
export function fakeSha(
  seed: string,
  algorithm: 'sha1' | 'sha256' = 'sha1',
): LongCommitSha {
  return toLongCommitSha(hash(seed, algorithm));
}

/**
 * Variables that `vi.stubEnv()` treats as booleans: it maps them onto '1' / ''
 * rather than deleting them, so they cannot be cleared through a stub.
 * Vitest sets them itself, and nothing under test reads them.
 */
const unstubbableEnvVars = new Set(['PROD', 'DEV', 'SSR']);

/**
 * Clear every environment variable for the duration of the current test.
 *
 * Replacing `process.env` wholesale would break `vi.stubEnv()`, which captures
 * the original object when the worker starts and would keep deleting from it.
 * Stubbing each key instead keeps that intact, and `unstubEnvs` restores them
 * all before the next test.
 */
export function clearEnv(): void {
  for (const key of Object.keys(process.env)) {
    if (!unstubbableEnvVars.has(key)) {
      vi.stubEnv(key, undefined);
    }
  }
}