import { mkdirSync, writeFileSync, chmodSync, rmSync } from 'node:fs';
import { join } from 'node:path';
import { tmpdir } from 'node:os';
import { randomUUID } from 'node:crypto';
import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import {
  extractProvider,
  parseDotenv,
  stripJSON5Extensions,
  checkOCConfigPermissions,
  isValidCredential,
  resolveCredentials,
  REDACTED_MARKER,
  PROVIDER_REGISTRY,
} from '../src/credential-resolver.js';
import { CredentialError } from '../src/types.js';

function makeTmpDir(): string {
  const dir = join(tmpdir(), `macp-test-${randomUUID()}`);
  mkdirSync(dir, { recursive: true });
  return dir;
}

describe('extractProvider', () => {
  it('extracts provider from model reference', () => {
    expect(extractProvider('anthropic/claude-3')).toBe('anthropic');
    expect(extractProvider('openai/gpt-4')).toBe('openai');
    expect(extractProvider('zai/model-x')).toBe('zai');
  });

  it('handles whitespace and casing', () => {
    expect(extractProvider('  Anthropic/claude-3  ')).toBe('anthropic');
  });

  it('throws on empty model reference', () => {
    expect(() => extractProvider('')).toThrow(CredentialError);
    expect(() => extractProvider('  ')).toThrow(CredentialError);
  });

  it('throws on unsupported provider', () => {
    expect(() => extractProvider('unknown/model')).toThrow(CredentialError);
    expect(() => extractProvider('unknown/model')).toThrow('Unsupported credential provider');
  });
});

describe('parseDotenv', () => {
  it('parses key=value pairs', () => {
    expect(parseDotenv('FOO=bar\nBAZ=qux')).toEqual({ FOO: 'bar', BAZ: 'qux' });
  });

  it('strips single and double quotes', () => {
    expect(parseDotenv('A="hello"\nB=\'world\'')).toEqual({ A: 'hello', B: 'world' });
  });

  it('skips comments and blank lines', () => {
    expect(parseDotenv('# comment\n\nFOO=bar\n  # another\n')).toEqual({ FOO: 'bar' });
  });

  it('skips lines without =', () => {
    expect(parseDotenv('NOEQUALS\nFOO=bar')).toEqual({ FOO: 'bar' });
  });

  it('skips lines with empty key', () => {
    expect(parseDotenv('=value\nFOO=bar')).toEqual({ FOO: 'bar' });
  });

  it('handles value with = in it', () => {
    expect(parseDotenv('KEY=val=ue')).toEqual({ KEY: 'val=ue' });
  });
});

describe('stripJSON5Extensions', () => {
  it('removes trailing commas', () => {
    const input = '{"a": 1, "b": 2,}';
    const result = JSON.parse(stripJSON5Extensions(input));
    expect(result).toEqual({ a: 1, b: 2 });
  });

  it('quotes unquoted keys', () => {
    const input = '{foo: "bar", baz: 42}';
    const result = JSON.parse(stripJSON5Extensions(input));
    expect(result).toEqual({ foo: 'bar', baz: 42 });
  });

  it('removes full-line comments', () => {
    const input = '{\n  // this is a comment\n  "key": "value"\n}';
    const result = JSON.parse(stripJSON5Extensions(input));
    expect(result).toEqual({ key: 'value' });
  });

  it('handles single-quoted strings', () => {
    const input = "{key: 'value'}";
    const result = JSON.parse(stripJSON5Extensions(input));
    expect(result).toEqual({ key: 'value' });
  });

  it('preserves URLs and timestamps inside string values', () => {
    const input = '{"url": "https://example.com/path?q=1", "ts": "2024-01-01T00:00:00Z"}';
    const result = JSON.parse(stripJSON5Extensions(input));
    expect(result.url).toBe('https://example.com/path?q=1');
    expect(result.ts).toBe('2024-01-01T00:00:00Z');
  });

  it('handles complex JSON5 with mixed features', () => {
    const input = `{
      // comment
      apiKey: 'sk-abc123',
      url: "https://api.example.com/v1",
      nested: {
        value: "hello",
        flag: true,
      },
    }`;
    const result = JSON.parse(stripJSON5Extensions(input));
    expect(result.apiKey).toBe('sk-abc123');
    expect(result.url).toBe('https://api.example.com/v1');
    expect(result.nested.value).toBe('hello');
    expect(result.nested.flag).toBe(true);
  });
});

describe('isValidCredential', () => {
  it('returns true for normal values', () => {
    expect(isValidCredential('sk-abc123')).toBe(true);
  });

  it('returns false for empty/whitespace', () => {
    expect(isValidCredential('')).toBe(false);
    expect(isValidCredential('   ')).toBe(false);
  });

  it('returns false for redacted marker', () => {
    expect(isValidCredential(REDACTED_MARKER)).toBe(false);
  });
});

describe('checkOCConfigPermissions', () => {
  let tmp: string;

  beforeEach(() => {
    tmp = makeTmpDir();
  });

  afterEach(() => {
    rmSync(tmp, { recursive: true, force: true });
  });

  it('returns false for non-existent file', () => {
    expect(checkOCConfigPermissions(join(tmp, 'missing.json'))).toBe(false);
  });

  it('returns true for file owned by current user', () => {
    const p = join(tmp, 'config.json');
    writeFileSync(p, '{}');
    chmodSync(p, 0o600);
    expect(checkOCConfigPermissions(p)).toBe(true);
  });

  it('returns true with warning for world-readable file', () => {
    const p = join(tmp, 'config.json');
    writeFileSync(p, '{}');
    chmodSync(p, 0o644);
    expect(checkOCConfigPermissions(p)).toBe(true);
  });

  it('returns false when uid does not match', () => {
    const p = join(tmp, 'config.json');
    writeFileSync(p, '{}');
    expect(checkOCConfigPermissions(p, { getuid: () => 99999 })).toBe(false);
  });
});

describe('resolveCredentials', () => {
  let tmp: string;

  beforeEach(() => {
    tmp = makeTmpDir();
  });

  afterEach(() => {
    rmSync(tmp, { recursive: true, force: true });
    delete process.env['ANTHROPIC_API_KEY'];
    delete process.env['OPENAI_API_KEY'];
    delete process.env['ZAI_API_KEY'];
    delete process.env['CUSTOM_KEY'];
  });

  it('resolves from credential file', () => {
    writeFileSync(join(tmp, 'anthropic.env'), 'ANTHROPIC_API_KEY=sk-file-key\n');
    const result = resolveCredentials('anthropic/claude-3', { credentialsDir: tmp });
    expect(result).toEqual({ ANTHROPIC_API_KEY: 'sk-file-key' });
  });

  it('resolves from ambient environment', () => {
    process.env['ANTHROPIC_API_KEY'] = 'sk-ambient-key';
    const result = resolveCredentials('anthropic/claude-3', {
      credentialsDir: join(tmp, 'empty'),
    });
    expect(result).toEqual({ ANTHROPIC_API_KEY: 'sk-ambient-key' });
  });

  it('resolves from OC config env block', () => {
    const ocPath = join(tmp, 'openclaw.json');
    writeFileSync(ocPath, JSON.stringify({ env: { ANTHROPIC_API_KEY: 'sk-oc-env' } }));
    const result = resolveCredentials('anthropic/claude-3', {
      credentialsDir: join(tmp, 'empty'),
      ocConfigPath: ocPath,
    });
    expect(result).toEqual({ ANTHROPIC_API_KEY: 'sk-oc-env' });
  });

  it('resolves from OC config provider apiKey', () => {
    const ocPath = join(tmp, 'openclaw.json');
    writeFileSync(
      ocPath,
      JSON.stringify({
        env: {},
        models: { providers: { anthropic: { apiKey: 'sk-oc-provider' } } },
      }),
    );
    const result = resolveCredentials('anthropic/claude-3', {
      credentialsDir: join(tmp, 'empty'),
      ocConfigPath: ocPath,
    });
    expect(result).toEqual({ ANTHROPIC_API_KEY: 'sk-oc-provider' });
  });

  it('mosaic credential file wins over OC config', () => {
    writeFileSync(join(tmp, 'anthropic.env'), 'ANTHROPIC_API_KEY=sk-file-wins\n');
    const ocPath = join(tmp, 'openclaw.json');
    writeFileSync(ocPath, JSON.stringify({ env: { ANTHROPIC_API_KEY: 'sk-oc-loses' } }));
    const result = resolveCredentials('anthropic/claude-3', {
      credentialsDir: tmp,
      ocConfigPath: ocPath,
    });
    expect(result).toEqual({ ANTHROPIC_API_KEY: 'sk-file-wins' });
  });

  it('gracefully falls back when OC config is missing', () => {
    process.env['ANTHROPIC_API_KEY'] = 'sk-fallback';
    const result = resolveCredentials('anthropic/claude-3', {
      credentialsDir: join(tmp, 'empty'),
      ocConfigPath: join(tmp, 'nonexistent.json'),
    });
    expect(result).toEqual({ ANTHROPIC_API_KEY: 'sk-fallback' });
  });

  it('skips redacted values in OC config', () => {
    const ocPath = join(tmp, 'openclaw.json');
    writeFileSync(ocPath, JSON.stringify({ env: { ANTHROPIC_API_KEY: REDACTED_MARKER } }));
    process.env['ANTHROPIC_API_KEY'] = 'sk-ambient';
    const result = resolveCredentials('anthropic/claude-3', {
      credentialsDir: join(tmp, 'empty'),
      ocConfigPath: ocPath,
    });
    expect(result).toEqual({ ANTHROPIC_API_KEY: 'sk-ambient' });
  });

  it('throws CredentialError when nothing resolves', () => {
    expect(() =>
      resolveCredentials('anthropic/claude-3', {
        credentialsDir: join(tmp, 'empty'),
        ocConfigPath: join(tmp, 'nonexistent.json'),
      }),
    ).toThrow(CredentialError);
  });

  it('supports task-level credential env var override', () => {
    process.env['CUSTOM_KEY'] = 'sk-custom';
    const result = resolveCredentials('anthropic/claude-3', {
      credentialsDir: join(tmp, 'empty'),
      ocConfigPath: join(tmp, 'nonexistent.json'),
      taskConfig: { credentials: { provider_key_env: 'CUSTOM_KEY' } },
    });
    expect(result).toEqual({ CUSTOM_KEY: 'sk-custom' });
  });

  it('handles JSON5 OC config syntax', () => {
    const ocPath = join(tmp, 'openclaw.json');
    writeFileSync(
      ocPath,
      `{
        // OC config with JSON5 features
        env: {
          ANTHROPIC_API_KEY: 'sk-json5-key',
        },
      }`,
    );
    const result = resolveCredentials('anthropic/claude-3', {
      credentialsDir: join(tmp, 'empty'),
      ocConfigPath: ocPath,
    });
    expect(result).toEqual({ ANTHROPIC_API_KEY: 'sk-json5-key' });
  });
});

describe('PROVIDER_REGISTRY', () => {
  it('has entries for anthropic, openai, zai', () => {
    expect(Object.keys(PROVIDER_REGISTRY)).toEqual(['anthropic', 'openai', 'zai']);
    for (const meta of Object.values(PROVIDER_REGISTRY)) {
      expect(meta).toHaveProperty('credential_file');
      expect(meta).toHaveProperty('env_var');
      expect(meta).toHaveProperty('oc_env_key');
      expect(meta).toHaveProperty('oc_provider_path');
    }
  });
});