import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import fs from 'fs';
import path from 'path';
import { ConfigSchema, loadConfig } from '../src/config/index.js';

// Helper to build a minimal valid config for partial testing
function minimalConfig(overrides: Record<string, unknown> = {}): Record<string, unknown> {
  return {
    reddit: { subreddits: ['test'], ...overrides.reddit },
    openrouter: { apiKey: 'key', imageAnalysisPrompt: 'test', messageGenerationPrompt: 'test', ...overrides.openrouter },
    rateLimit: overrides.rateLimit ?? {},
    browser: overrides.browser ?? {},
    database: overrides.database ?? {},
    media: overrides.media ?? {},
    strategies: overrides.strategies ?? {},
    web: overrides.web ?? {},
  };
}

describe('ConfigSchema', () => {
  describe('reddit section', () => {
    it('validates required subreddits array', () => {
      const result = ConfigSchema.safeParse(minimalConfig({ reddit: { subreddits: ['test'] } }));
      expect(result.success).toBe(true);
    });

    it('rejects empty subreddits array', () => {
      const result = ConfigSchema.safeParse(minimalConfig({ reddit: { subreddits: [] } }));
      expect(result.success).toBe(false);
      if (!result.success) {
        const issue = result.error.issues.find(i => i.path.includes('subreddits'));
        expect(issue).toBeDefined();
      }
    });

    it('applies default targetGenders', () => {
      const result = ConfigSchema.safeParse(minimalConfig({ reddit: { subreddits: ['test'] } }));
      expect(result.success).toBe(true);
      if (result.success) {
        expect(result.data.reddit.targetGenders).toEqual(['female']);
      }
    });

    it('applies default tone to subreddits', () => {
      const result = ConfigSchema.safeParse(minimalConfig({ reddit: { subreddits: ['test'] } }));
      expect(result.success).toBe(true);
      if (result.success) {
        expect(result.data.reddit.subreddits[0].tone).toBe('default');
      }
    });

    it('enables subreddits by default', () => {
      const result = ConfigSchema.safeParse(minimalConfig({ reddit: { subreddits: ['test'] } }));
      expect(result.success).toBe(true);
      if (result.success) expect(result.data.reddit.subreddits[0].enabled).toBe(true);
    });

    it('accepts valid tone values', () => {
      for (const tone of ['default', 'dominant', 'submissive', 'playful', 'direct', 'gentle', 'kink-friendly', 'teasing']) {
        const result = ConfigSchema.safeParse({
          reddit: { subreddits: [{ name: 'test', tone }] },
          openrouter: { apiKey: 'key', imageAnalysisPrompt: 'test', messageGenerationPrompt: 'test' },
          rateLimit: {}, browser: {}, database: {}, media: {}, strategies: {}, web: {},
        });
        expect(result.success).toBe(true);
      }
    });

    it('rejects invalid tone', () => {
      const result = ConfigSchema.safeParse({
        reddit: { subreddits: [{ name: 'test', tone: 'bananas' }] },
        openrouter: { apiKey: 'key', imageAnalysisPrompt: 'test', messageGenerationPrompt: 'test' },
        rateLimit: {}, browser: {}, database: {}, media: {}, strategies: {}, web: {},
      });
      expect(result.success).toBe(false);
    });

    it('accepts scripted field', () => {
      const result = ConfigSchema.safeParse({
        reddit: { subreddits: [{ name: 'test', scripted: 'Hello {author}' }] },
        openrouter: { apiKey: 'key', imageAnalysisPrompt: 'test', messageGenerationPrompt: 'test' },
        rateLimit: {}, browser: {}, database: {}, media: {}, strategies: {}, web: {},
      });
      expect(result.success).toBe(true);
    });

    it('accepts valid targetGenders', () => {
      const result = ConfigSchema.safeParse(minimalConfig({
        reddit: { subreddits: ['test'], targetGenders: ['male', 'female', 'other', 'unknown'] },
      }));
      expect(result.success).toBe(true);
    });

    it('rejects invalid targetGender', () => {
      const result = ConfigSchema.safeParse(minimalConfig({
        reddit: { subreddits: ['test'], targetGenders: ['invalid'] },
      }));
      expect(result.success).toBe(false);
    });

    it('applies default sellerKeywords', () => {
      const result = ConfigSchema.safeParse(minimalConfig({ reddit: { subreddits: ['test'] } }));
      expect(result.success).toBe(true);
      if (result.success) {
        expect(result.data.reddit.sellerKeywords.length).toBeGreaterThan(0);
        expect(result.data.reddit.sellerKeywords).toContain('onlyfans');
      }
    });

    it('accepts custom sellerKeywords', () => {
      const result = ConfigSchema.safeParse(minimalConfig({
        reddit: { subreddits: ['test'], sellerKeywords: ['custom1', 'custom2'] },
      }));
      expect(result.success).toBe(true);
    });

    it('applies default pollIntervalMs', () => {
      const result = ConfigSchema.safeParse(minimalConfig({ reddit: { subreddits: ['test'] } }));
      expect(result.success).toBe(true);
      if (result.success) {
        expect(result.data.reddit.pollIntervalMs).toBe(120000);
      }
    });

    it('accepts custom pollIntervalMs', () => {
      const result = ConfigSchema.safeParse(minimalConfig({
        reddit: { subreddits: ['test'], pollIntervalMs: 30000 },
      }));
      expect(result.success).toBe(true);
    });
  });

  describe('openrouter section', () => {
    // Build openrouter directly — minimalConfig's spread can only override, not delete.
    function configWithOpenrouter(openrouter: Record<string, unknown>): Record<string, unknown> {
      return {
        reddit: { subreddits: ['test'] },
        openrouter,
        rateLimit: {}, browser: {}, database: {}, media: {}, strategies: {}, web: {},
      };
    }

    it('requires apiKey', () => {
      const result = ConfigSchema.safeParse(configWithOpenrouter({
        imageAnalysisPrompt: 'test',
        messageGenerationPrompt: 'test',
      }));
      expect(result.success).toBe(false);
    });

    it('requires imageAnalysisPrompt', () => {
      const result = ConfigSchema.safeParse(configWithOpenrouter({
        apiKey: 'key',
        messageGenerationPrompt: 'test',
      }));
      expect(result.success).toBe(false);
    });

    it('requires messageGenerationPrompt', () => {
      const result = ConfigSchema.safeParse(configWithOpenrouter({
        apiKey: 'key',
        imageAnalysisPrompt: 'test',
      }));
      expect(result.success).toBe(false);
    });

    it('applies default models', () => {
      const result = ConfigSchema.safeParse(minimalConfig({
        openrouter: { apiKey: 'key', imageAnalysisPrompt: 'test', messageGenerationPrompt: 'test' },
      }));
      expect(result.success).toBe(true);
      if (result.success) {
        expect(result.data.openrouter.imageAnalysisModel).toBeDefined();
        expect(result.data.openrouter.chatModel).toBeDefined();
        expect(result.data.openrouter.imageAnalysisFallbackModels).toEqual([]);
      }
    });

    it('accepts custom models and fallbacks', () => {
      const result = ConfigSchema.safeParse(minimalConfig({
        openrouter: {
          apiKey: 'key',
          imageAnalysisModel: 'custom-model',
          imageAnalysisFallbackModels: ['fallback1', 'fallback2'],
          chatModel: 'chat-model',
          imageAnalysisPrompt: 'test',
          messageGenerationPrompt: 'test',
        },
      }));
      expect(result.success).toBe(true);
    });
  });

  describe('rateLimit section', () => {
    it('applies defaults', () => {
      const result = ConfigSchema.safeParse(minimalConfig());
      expect(result.success).toBe(true);
      if (result.success) {
        expect(result.data.rateLimit.minDelayBetweenMessagesMs).toBe(300000);
        expect(result.data.rateLimit.maxMessagesPerHour).toBe(8);
        expect(result.data.rateLimit.jitterMs).toBe(60000);
      }
    });

    it('accepts custom rate limits', () => {
      const result = ConfigSchema.safeParse(minimalConfig({
        rateLimit: { minDelayBetweenMessagesMs: 5000, maxMessagesPerHour: 50, jitterMs: 30000 },
      }));
      expect(result.success).toBe(true);
    });
  });

  describe('browser section', () => {
    it('applies defaults', () => {
      const result = ConfigSchema.safeParse(minimalConfig());
      expect(result.success).toBe(true);
      if (result.success) {
        expect(result.data.browser.sessionDir).toBe('./data/browser-session');
        expect(result.data.browser.dryRun).toBe(false);
      }
    });
  });

  describe('strategies section', () => {
    it('applies defaults', () => {
      const result = ConfigSchema.safeParse(minimalConfig());
      expect(result.success).toBe(true);
      if (result.success) {
        expect(result.data.strategies.explorationRate).toBe(0.2);
        expect(result.data.strategies.minSamples).toBe(20);
        expect(result.data.strategies.responseWindowHours).toBe(12);
        expect(result.data.strategies.variants).toEqual([]);
        expect(result.data.chatStrategies.responseWindowHours).toBe(12);
      }
    });

    it('validates explorationRate bounds', () => {
      const result1 = ConfigSchema.safeParse(minimalConfig({ strategies: { explorationRate: -0.1 } }));
      expect(result1.success).toBe(false);

      const result2 = ConfigSchema.safeParse(minimalConfig({ strategies: { explorationRate: 1.1 } }));
      expect(result2.success).toBe(false);

      const result3 = ConfigSchema.safeParse(minimalConfig({ strategies: { explorationRate: 0 } }));
      expect(result3.success).toBe(true);

      const result4 = ConfigSchema.safeParse(minimalConfig({ strategies: { explorationRate: 1 } }));
      expect(result4.success).toBe(true);
    });

    it('validates strategy variant structure', () => {
      const result = ConfigSchema.safeParse(minimalConfig({
        strategies: {
          variants: [
            { id: 'v1', promptOverride: 'test' },
            { id: 'v2', weight: 3, promptOverride: 'test2' },
          ],
        },
      }));
      expect(result.success).toBe(true);
    });

    it('rejects variant without id', () => {
      const result = ConfigSchema.safeParse(minimalConfig({
        strategies: {
          variants: [{ promptOverride: 'test' }],
        },
      }));
      expect(result.success).toBe(false);
    });
  });

  describe('web section', () => {
    it('applies defaults', () => {
      const result = ConfigSchema.safeParse(minimalConfig());
      expect(result.success).toBe(true);
      if (result.success) {
        expect(result.data.web.enabled).toBe(true);
        expect(result.data.web.port).toBe(3000);
      }
    });
  });

  describe('full config', () => {
    it('validates complete config', () => {
      const result = ConfigSchema.safeParse({
        reddit: { subreddits: ['test'] },
        openrouter: { apiKey: 'key', imageAnalysisPrompt: 'test', messageGenerationPrompt: 'test' },
        rateLimit: {},
        browser: {},
        database: {},
        media: {},
        strategies: {},
        web: {},
      });
      expect(result.success).toBe(true);
    });
  });
});

describe('loadConfig', () => {
  const originalCwd = process.cwd;
  const savedEnv: Record<string, string | undefined> = {};
  const trackedEnvKeys = ['OPENROUTER_API_KEY', 'WEB_DASHBOARD_TOKEN'];

  beforeEach(() => {
    // Snapshot then clear any env vars that loadConfig consults — these may be
    // populated from the user's real .env via dotenv.config() at module load.
    for (const key of trackedEnvKeys) {
      savedEnv[key] = process.env[key];
      delete process.env[key];
    }
    process.env.WEB_DASHBOARD_TOKEN = 'test-dashboard-token';

    const mockDir = '/tmp/test-config-' + Date.now();
    fs.mkdirSync(mockDir, { recursive: true });
    process.chdir(mockDir);
  });

  afterEach(() => {
    process.chdir(originalCwd());
    try {
      fs.rmSync('/tmp/test-config-*', { recursive: true, force: true });
    } catch { /* ignore */ }
    for (const key of trackedEnvKeys) {
      if (savedEnv[key] === undefined) {
        delete process.env[key];
      } else {
        process.env[key] = savedEnv[key];
      }
    }
  });

  it('throws when config file does not exist', () => {
    expect(() => {
    loadConfig();
    }).toThrow('Config file not found');
  });

  it('loads config from config.yaml', () => {
    const configPath = path.join(process.cwd(), 'config.yaml');
    fs.writeFileSync(configPath, `
reddit:
  subreddits:
    - test-sub
  pollIntervalMs: 5000
openrouter:
  apiKey: yaml-key
  imageAnalysisPrompt: analyze this
  messageGenerationPrompt: write message
`);

const config = loadConfig();
    expect(config.reddit.subreddits).toEqual([{ name: 'test-sub', enabled: true, type: 'image', tone: 'default' }]);
    expect(config.reddit.pollIntervalMs).toBe(5000);
    expect(config.openrouter.apiKey).toBe('yaml-key');
  });

  it('overrides apiKey from OPENROUTER_API_KEY env var', () => {
    process.env.OPENROUTER_API_KEY = 'env-key';
    const configPath = path.join(process.cwd(), 'config.yaml');
    fs.writeFileSync(configPath, `
reddit:
  subreddits:
    - test
openrouter:
  apiKey: yaml-key
  imageAnalysisPrompt: analyze this
  messageGenerationPrompt: write message
`);

const config = loadConfig();
    expect(config.openrouter.apiKey).toBe('env-key');
  });

  it('rejects config with invalid values', () => {
    const configPath = path.join(process.cwd(), 'config.yaml');
    fs.writeFileSync(configPath, `
reddit:
  subreddits: []
openrouter:
  apiKey: key
  imageAnalysisPrompt: analyze this
  messageGenerationPrompt: write message
`);

expect(() => loadConfig()).toThrow('Invalid configuration');
  });

  it('throws when OPENROUTER_API_KEY is missing', () => {
    const configPath = path.join(process.cwd(), 'config.yaml');
    fs.writeFileSync(configPath, `
reddit:
  subreddits:
    - test
openrouter:
  imageAnalysisPrompt: analyze this
  messageGenerationPrompt: write message
`);

expect(() => loadConfig()).toThrow('OPENROUTER_API_KEY environment variable is required');
  });

  it('requires a dashboard token when the dashboard is enabled', () => {
    delete process.env.WEB_DASHBOARD_TOKEN;
    const configPath = path.join(process.cwd(), 'config.yaml');
    fs.writeFileSync(configPath, `
reddit:
  subreddits: [test]
openrouter:
  apiKey: key
  imageAnalysisPrompt: analyze this
  messageGenerationPrompt: write message
`);

    expect(() => loadConfig()).toThrow('WEB_DASHBOARD_TOKEN');
  });

  it('injects the dashboard token from the environment', () => {
    process.env.WEB_DASHBOARD_TOKEN = 'a-secure-dashboard-token';
    const configPath = path.join(process.cwd(), 'config.yaml');
    fs.writeFileSync(configPath, `
reddit:
  subreddits: [test]
openrouter:
  apiKey: key
  imageAnalysisPrompt: analyze this
  messageGenerationPrompt: write message
`);

    expect(loadConfig().web.authToken).toBe('a-secure-dashboard-token');
  });
});