/**
 * Web Research Workflow — Browser Agent Integration
 *
 * Provides high-level research capabilities:
 * - Search on Google/Bing
 * - Extract data from websites
 * - Take screenshots for documentation
 * - Compile research results
 */

import { createBrowserSession, executeBrowserAction, BrowserAction, BrowserResult } from "./browser-agent";
import { autoCreateTasks, trackTaskCompletion } from "./orchestrator";
import { createTask, updateTask } from "./db";

export interface ResearchQuery {
  query: string;
  maxResults?: number;
  includeScreenshots?: boolean;
  extractText?: boolean;
}

export interface ResearchResult {
  success: boolean;
  query: string;
  results: Array<{
    title: string;
    url: string;
    snippet?: string;
    screenshotUrl?: string;
    extractedText?: string;
  }>;
  totalResults: number;
  executionTimeMs: number;
  error?: string;
}

/**
 * Perform web research using Browser Agent
 */
export async function performWebResearch(
  agentId: number,
  conversationId: string,
  query: ResearchQuery
): Promise<ResearchResult> {
  const startTime = Date.now();
  const results: ResearchResult["results"] = [];

  try {
    // Create browser session
    const sessionResult = await createBrowserSession(agentId);
    if (!sessionResult.sessionId) {
      throw new Error(sessionResult.error || "Failed to create browser session");
    }

    const sessionId = sessionResult.sessionId;

    // Create task for this research
    const task = await createTask({
      agentId,
      conversationId,
      title: `🔍 Web Research: ${query.query.substring(0, 50)}`,
      description: `Search and extract information about: ${query.query}`,
      status: "in_progress",
      priority: "high",
      metadata: {
        researchQuery: query.query,
        sessionId,
        type: "web_research",
      },
    });

    const taskId = task?.id;

    try {
      // Navigate to Google Search
      const searchUrl = `https://www.google.com/search?q=${encodeURIComponent(query.query)}`;
      const navResult = await executeBrowserAction(sessionId, {
        type: "navigate",
        params: { url: searchUrl },
      });

      if (!navResult.success) {
        throw new Error("Failed to navigate to search results");
      }

      // Wait for results to load
      await executeBrowserAction(sessionId, {
        type: "wait",
        params: { selector: "div.g", timeout: 5000 },
      });

      // Extract search results
      const extractResult = await executeBrowserAction(sessionId, {
        type: "evaluate",
        params: {
          script: `
            const results = [];
            const items = document.querySelectorAll('div.g');
            items.forEach((item, idx) => {
              if (idx >= ${query.maxResults || 5}) return;
              
              const titleEl = item.querySelector('h3');
              const linkEl = item.querySelector('a');
              const snippetEl = item.querySelector('div.VwiC3b');
              
              if (titleEl && linkEl) {
                results.push({
                  title: titleEl.textContent || '',
                  url: linkEl.href || '',
                  snippet: snippetEl?.textContent || ''
                });
              }
            });
            return results;
          `,
        },
      });

      if (extractResult.success && extractResult.data) {
        for (const result of extractResult.data) {
          let screenshotUrl: string | undefined;
          let extractedText: string | undefined;

          // Take screenshot if requested
          if (query.includeScreenshots) {
            const screenshotResult = await executeBrowserAction(sessionId, {
              type: "navigate",
              params: { url: result.url },
            });

            if (screenshotResult.success) {
              const screenshot = await executeBrowserAction(sessionId, {
                type: "screenshot",
                params: { fullPage: false },
              });
              screenshotUrl = screenshot.screenshotUrl;
            }
          }

          // Extract text if requested
          if (query.extractText) {
            const textResult = await executeBrowserAction(sessionId, {
              type: "evaluate",
              params: {
                script: `
                  document.body.innerText.substring(0, 2000)
                `,
              },
            });
            extractedText = textResult.data;
          }

          results.push({
            title: result.title,
            url: result.url,
            snippet: result.snippet,
            screenshotUrl,
            extractedText,
          });
        }
      }

      // Update task status
      if (taskId) {
        await updateTask(taskId, {
          status: "completed",
          result: JSON.stringify({
            query: query.query,
            resultsCount: results.length,
            timestamp: new Date().toISOString(),
          }),
        });
      }

      return {
        success: true,
        query: query.query,
        results,
        totalResults: results.length,
        executionTimeMs: Date.now() - startTime,
      };
    } catch (error: any) {
      // Update task with error
      if (taskId) {
        await updateTask(taskId, {
          status: "failed",
          errorMessage: error.message,
        });
      }

      throw error;
    }
  } catch (error: any) {
    return {
      success: false,
      query: query.query,
      results: [],
      totalResults: 0,
      executionTimeMs: Date.now() - startTime,
      error: error.message,
    };
  }
}

/**
 * Compile research results into a report
 */
export async function compileResearchReport(
  results: ResearchResult[],
  title: string
): Promise<string> {
  let report = `# ${title}\n\n`;
  report += `Generated: ${new Date().toISOString()}\n\n`;

  for (const research of results) {
    report += `## Query: ${research.query}\n`;
    report += `Total Results: ${research.totalResults}\n\n`;

    for (const result of research.results) {
      report += `### ${result.title}\n`;
      report += `**URL:** [${result.url}](${result.url})\n`;

      if (result.snippet) {
        report += `**Summary:** ${result.snippet}\n`;
      }

      if (result.screenshotUrl) {
        report += `![Screenshot](${result.screenshotUrl})\n`;
      }

      if (result.extractedText) {
        report += `**Extracted Text:**\n\`\`\`\n${result.extractedText}\n\`\`\`\n`;
      }

      report += "\n";
    }
  }

  return report;
}

/**
 * Auto-create research tasks for orchestrator
 */
export async function createResearchTasks(
  agentId: number,
  conversationId: string,
  queries: string[]
): Promise<number[]> {
  const taskIds: number[] = [];

  for (const query of queries) {
    try {
      const task = await createTask({
        agentId,
        conversationId,
        title: `🔍 Research: ${query.substring(0, 40)}`,
        description: `Perform web research for: ${query}`,
        status: "pending",
        priority: "medium",
        metadata: {
          type: "web_research",
          query,
          autoCreated: true,
        },
      });

      if (task?.id) {
        taskIds.push(task.id);
      }
    } catch (error) {
      console.error(`[Web Research] Failed to create task for query "${query}":`, error);
    }
  }

  return taskIds;
}