Social Media Analytics Tool JavaScript, API

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```javascript
/**
 * A basic Social Media Analytics Tool using JavaScript and a hypothetical API.
 * 
 * Note:  This is a simplified example.  A real-world tool would require
 * a robust API, authentication, error handling, and more advanced data processing.
 * Also, the API functions are placeholders, and would need to be replaced with
 * actual API calls to a social media platform.
 */

class SocialMediaAnalyticsTool {

  constructor(apiKey) {
    this.apiKey = apiKey; // Replace with your API key
    this.platform = null;  // Set platform (e.g., 'Twitter', 'Facebook')
    this.userId = null; // The user/profile we're analyzing
  }

  /**
   *  Sets the platform and authenticates with the API (placeholder).
   *  Replace with your actual authentication logic.
   *
   * @param {string} platformName The name of the social media platform (e.g., "Twitter")
   * @param {string} userId The user or profile ID to analyze.
   * @returns {Promise<boolean>} True if authentication is successful, false otherwise.
   */
  async setPlatform(platformName, userId) {
    this.platform = platformName;
    this.userId = userId;

    // Simulate authentication (replace with actual API call)
    try {
      const authResult = await this._authenticate(platformName, this.apiKey); // Hypothetical auth function
      if (authResult.success) {
        console.log(`Authenticated with ${platformName} as user ${userId}`);
        return true;
      } else {
        console.error(`Authentication failed for ${platformName}: ${authResult.message}`);
        return false;
      }
    } catch (error) {
      console.error("Error during authentication:", error);
      return false;
    }
  }


  /**
   * Hypothetical authentication function.  REPLACE WITH REAL API AUTH!
   * @param {string} platformName
   * @param {string} apiKey
   * @returns {Promise<{success: boolean, message?: string}>}
   * @private
   */
  async _authenticate(platformName, apiKey) {
    return new Promise((resolve) => {
      // Simulate an API call that takes 1 second
      setTimeout(() => {
        if (apiKey && apiKey.length > 0) { // Very basic API key check
          resolve({ success: true });
        } else {
          resolve({ success: false, message: "Invalid API key" });
        }
      }, 1000); // Simulate API call time
    });
  }


  /**
   * Retrieves user profile data (placeholder API call).
   * Replace with actual API endpoint.
   *
   * @returns {Promise<object|null>} User profile data, or null if an error occurs.
   */
  async getUserProfile() {
    if (!this.platform || !this.userId) {
      console.error("Platform and user ID must be set before fetching profile data.");
      return null;
    }

    try {
      const profileData = await this._fetchUserProfile(this.platform, this.userId); // Hypothetical API call
      console.log("User Profile:", profileData);
      return profileData;
    } catch (error) {
      console.error("Error fetching user profile:", error);
      return null;
    }
  }

  /**
   * Hypothetical API call for fetching user profile.  REPLACE WITH REAL API CALL
   * @param {string} platform
   * @param {string} userId
   * @returns {Promise<object>}
   * @private
   */
  async _fetchUserProfile(platform, userId) {
    return new Promise((resolve, reject) => {
      // Simulate an API call that takes 1.5 seconds
      setTimeout(() => {
        if (platform === 'Twitter') {
          resolve({
            username: `TwitterUser_${userId}`,
            followers: Math.floor(Math.random() * 10000),
            following: Math.floor(Math.random() * 5000),
            bio: "A sample Twitter bio.",
            posts: []
          });
        } else if (platform === 'Facebook') {
          resolve({
            name: `Facebook User ${userId}`,
            friends: Math.floor(Math.random() * 2000),
            likes: Math.floor(Math.random() * 1000),
            about: "A sample Facebook 'about me'.",
            posts: []
          });
        } else {
          reject("Unsupported platform.");
        }
      }, 1500); // Simulate API call time
    });
  }


  /**
   * Retrieves recent posts (placeholder API call).
   * Replace with actual API endpoint.
   *
   * @param {number} [count=10] The number of posts to retrieve.
   * @returns {Promise<Array<object>|null>} An array of post objects, or null if an error occurs.
   */
  async getRecentPosts(count = 10) {
    if (!this.platform || !this.userId) {
      console.error("Platform and user ID must be set before fetching posts.");
      return null;
    }

    try {
      const posts = await this._fetchRecentPosts(this.platform, this.userId, count); // Hypothetical API call
      console.log("Recent Posts:", posts);
      return posts;
    } catch (error) {
      console.error("Error fetching recent posts:", error);
      return null;
    }
  }

  /**
   * Hypothetical API call for fetching recent posts.  REPLACE WITH REAL API CALL
   * @param {string} platform
   * @param {string} userId
   * @param {number} count
   * @returns {Promise<Array<object>>}
   * @private
   */
  async _fetchRecentPosts(platform, userId, count) {
    return new Promise((resolve, reject) => {
      // Simulate an API call that takes 2 seconds
      setTimeout(() => {
        const posts = [];
        for (let i = 0; i < count; i++) {
          posts.push({
            id: `post_${i}`,
            text: `Sample post text ${i} from user ${userId} on ${platform}.`,
            likes: Math.floor(Math.random() * 200),
            retweets: platform === 'Twitter' ? Math.floor(Math.random() * 50) : undefined,
            comments: Math.floor(Math.random() * 100),
            timestamp: new Date(Date.now() - i * 60 * 60 * 1000).toISOString() // Generate some realistic timestamps
          });
        }
        resolve(posts);
      }, 2000); // Simulate API call time
    });
  }


  /**
   * Analyzes sentiment of a text.  This is a very basic example.
   * Replace with a more sophisticated NLP/sentiment analysis library.
   *
   * @param {string} text The text to analyze.
   * @returns {string} "Positive", "Negative", or "Neutral".
   */
  analyzeSentiment(text) {
    // Very basic sentiment analysis (replace with a real NLP library)
    const positiveKeywords = ["good", "great", "amazing", "love", "happy", "excellent"];
    const negativeKeywords = ["bad", "terrible", "awful", "hate", "sad", "poor"];

    let positiveCount = 0;
    let negativeCount = 0;

    const words = text.toLowerCase().split(/\s+/); // Split into words and lowercase

    for (const word of words) {
      if (positiveKeywords.includes(word)) {
        positiveCount++;
      }
      if (negativeKeywords.includes(word)) {
        negativeCount++;
      }
    }

    if (positiveCount > negativeCount) {
      return "Positive";
    } else if (negativeCount > positiveCount) {
      return "Negative";
    } else {
      return "Neutral";
    }
  }

  /**
   * Generates a simple report based on the data fetched.
   *
   * @returns {Promise<string>} A summary report.
   */
  async generateReport() {
    if (!this.platform || !this.userId) {
      return "Platform and user ID must be set before generating a report.";
    }

    const profile = await this.getUserProfile();
    const posts = await this.getRecentPosts(5);

    if (!profile || !posts) {
      return "Could not retrieve profile or posts.  Report generation failed.";
    }

    let totalLikes = 0;
    let sentimentScores = { Positive: 0, Negative: 0, Neutral: 0 };

    for (const post of posts) {
      totalLikes += post.likes;
      const sentiment = this.analyzeSentiment(post.text);
      sentimentScores[sentiment]++;
    }


    let report = `
      Social Media Analytics Report for ${this.platform} user ${this.userId}:

      Profile Information:
      ---------------------
      `;

    if (this.platform === 'Twitter') {
      report += `Username: ${profile.username}\n`;
      report += `Followers: ${profile.followers}\n`;
      report += `Following: ${profile.following}\n`;
    } else if (this.platform === 'Facebook') {
      report += `Name: ${profile.name}\n`;
      report += `Friends: ${profile.friends}\n`;
    }

    report +=`
      Recent Posts Analysis:
      ----------------------
      Total Likes on Recent Posts: ${totalLikes}
      Sentiment Analysis:
      - Positive: ${sentimentScores.Positive}
      - Negative: ${sentimentScores.Negative}
      - Neutral: ${sentimentScores.Neutral}
    `;

    return report;
  }
}


// Example Usage (replace with your API key and user ID)
async function runExample() {
  const apiKey = "YOUR_API_KEY"; // Replace with your actual API key
  const userId = "12345";

  const analyticsTool = new SocialMediaAnalyticsTool(apiKey);

  const authSuccess = await analyticsTool.setPlatform("Twitter", userId);  // Try Twitter first

  if (!authSuccess) {
      const fbAuthSuccess = await analyticsTool.setPlatform("Facebook", userId); // Try Facebook if Twitter fails.
      if(!fbAuthSuccess){
          console.error("Authentication failed for both Twitter and Facebook.  Cannot continue.");
          return;
      }
  }


  const report = await analyticsTool.generateReport();
  console.log(report);
}


runExample();
```
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