import { accountLinkingService } from './account-linking.server';
import { githubApp } from './github-app.server';

// Default API URL
const DEFAULT_API_URL = 'https://huggingface-hugex-explore.hf.space/api';

interface HugExRepository {
  url: string;
}

interface HugExEnvironment {
  LLM_MODEL: string;
  LLM_PROVIDER: string;
}

interface HugExSecrets {
  [key: string]: string;
}

export interface HugExJobCreationParams {
  title: string;
  description: string;
  repository: HugExRepository;
  branch: string;
  environment: HugExEnvironment;
  secrets: HugExSecrets;
}

export interface HugExJob {
  id: string;
  status: string;
  createdAt: string;
  title: string;
  repository: HugExRepository;
}

export class HugExService {
  private apiUrl: string;

  constructor() {
    this.apiUrl = process.env.HUGEX_API_URL || DEFAULT_API_URL;
    
    // Log configuration status
    if (!process.env.HUGEX_API_URL) {
      console.log(`ℹ️ Using default HugEx API URL: ${this.apiUrl}`);
    } else {
      console.log(`✅ HugEx API configured: ${this.apiUrl}`);
    }
  }

  /**
   * Process a GitHub issue to check for @hugex mentions and create jobs
   */
  async processGitHubIssue(issue: any, repository: any): Promise<boolean> {
    try {
      // Check if issue body contains @hugex mention
      if (!issue.body || !issue.body.includes('@hugex')) {
        return false;
      }

      console.log(`🤖 Found @hugex mention in issue #${issue.number}: ${issue.title}`);

      // Get GitHub user's linked HF account
      const githubUserId = issue.user.id.toString();
      const accountLink = accountLinkingService.findByGitHubUser(githubUserId);

      if (!accountLink) {
        console.log(`⚠️ No linked HuggingFace account found for GitHub user: ${issue.user.login}`);
        
        // Comment on the issue to inform the user they need to link their account
        await this.commentOnIssue(
          repository.owner.login,
          repository.name,
          issue.number,
          `⚠️ @${issue.user.login}, to use @hugex, you need to link your GitHub account with your HuggingFace account. Please visit the dashboard to complete this process.`
        );
        return false;
      }

      // Extract job parameters from issue body
      const jobParams = await this.extractJobParamsFromIssue(issue, repository);
      
      // Create HugEx job
      const jobId = await this.createJob(accountLink.huggingfaceUsername, jobParams);
      
      if (jobId) {
        console.log(`✅ Created HugEx job ${jobId} for issue #${issue.number}`);
        
        // Comment on the issue with job info
        await this.commentOnIssue(
          repository.owner.login,
          repository.name,
          issue.number,
          `🚀 Created HugEx job for this issue. You can track progress at ${this.apiUrl}/jobs/${jobId}`
        );
        return true;
      }
      
      return false;
    } catch (error) {
      console.error('Error processing GitHub issue for HugEx:', error);
      return false;
    }
  }

  /**
   * Extract job parameters from issue body
   */
  private async extractJobParamsFromIssue(issue: any, repository: any): Promise<HugExJobCreationParams> {
    // Default values
    const params: HugExJobCreationParams = {
      title: issue.title,
      description: issue.body,
      repository: {
        url: repository.html_url
      },
      branch: repository.default_branch || 'main',
      environment: {
        LLM_MODEL: 'gpt-4',
        LLM_PROVIDER: 'openai'
      },
      secrets: {}
    };

    // Extract custom parameters if available
    try {
      // Look for JSON block in the issue body
      const jsonMatch = issue.body.match(/```json\s*([\s\S]*?)\s*```/);
      if (jsonMatch && jsonMatch[1]) {
        const customParams = JSON.parse(jsonMatch[1]);
        
        // Merge with defaults, keeping required structure
        if (customParams.title) params.title = customParams.title;
        if (customParams.description) params.description = customParams.description;
        if (customParams.repository && customParams.repository.url) {
          params.repository.url = customParams.repository.url;
        }
        if (customParams.branch) params.branch = customParams.branch;
        if (customParams.environment) params.environment = {
          ...params.environment,
          ...customParams.environment
        };
        if (customParams.secrets) params.secrets = {
          ...params.secrets,
          ...customParams.secrets
        };
      }
    } catch (error) {
      console.warn('Failed to parse custom parameters from issue body:', error);
      // Continue with default parameters
    }

    return params;
  }

  /**
   * Create a new HugEx job
   */
  async createJob(huggingfaceUsername: string, params: HugExJobCreationParams): Promise<string | null> {
    try {
      // Get HuggingFace token from persistent storage
      // Note: In a real implementation, you'd need a secure way to store and retrieve HF tokens
      // This is a placeholder - you need to implement token storage
      const hfToken = await this.getHuggingFaceToken(huggingfaceUsername);
      
      if (!hfToken) {
        console.error(`No HuggingFace token available for user: ${huggingfaceUsername}`);
        return null;
      }

      const response = await fetch(`${this.apiUrl}/jobs/create-with-key`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${hfToken}`
        },
        body: JSON.stringify(params)
      });

      if (!response.ok) {
        const errorText = await response.text();
        throw new Error(`Failed to create HugEx job: ${response.status} - ${errorText}`);
      }

      const responseData = await response.json();
      return responseData.id || null;
    } catch (error) {
      console.error('Error creating HugEx job:', error);
      return null;
    }
  }

  /**
   * Comment on a GitHub issue
   */
  private async commentOnIssue(owner: string, repo: string, issueNumber: number, body: string): Promise<void> {
    try {
      // Get installation Octokit instance for the repository
      const installation = await githubApp.getInstallationByRepo(owner, repo);
      if (!installation) {
        throw new Error(`No GitHub App installation found for repository: ${owner}/${repo}`);
      }

      const octokit = await githubApp.getInstallationOctokit(installation.id);
      
      await octokit.rest.issues.createComment({
        owner,
        repo,
        issue_number: issueNumber,
        body
      });
      
      console.log(`✅ Posted comment on ${owner}/${repo}#${issueNumber}`);
    } catch (error) {
      console.error('Error commenting on GitHub issue:', error);
    }
  }

  /**
   * Get HuggingFace token for a user from the account link
   */
  private async getHuggingFaceToken(username: string): Promise<string | null> {
    // Look up the user's account link to get the stored token
    const accountLink = accountLinkingService.findByHuggingFaceUser(username);
    
    if (accountLink && accountLink.huggingfaceAccessToken) {
      console.log(`✅ Retrieved HuggingFace access token for user: ${username}`);
      return accountLink.huggingfaceAccessToken;
    }
    
    // Fall back to default token if no specific token is found
    console.warn(`⚠️ No HuggingFace access token found for user: ${username}. Using default token if available.`);
    return process.env.HF_DEFAULT_TOKEN || null;
  }
}

// Singleton instance
export const hugexService = new HugExService();