const fs = require("fs");

class TaskService {
  constructor(filePath) {
    this.filePath = filePath;
  }

  completeTask(taskName, userName) {
    const raw = fs.readFileSync(this.filePath, "utf8");
    const state = JSON.parse(raw);
    const task = state.tasks.find((item) => item.name === taskName);

    if (!task) {
      throw new Error("Task not found");
    }

    if (task.completed) {
      return {
        message: "Task already complete",
        pointsAwarded: 0,
        badge: null
      };
    }

    task.completed = true;
    task.completedAt = new Date().toISOString();

    let pointsAwarded = 10;

    if (userName && userName.toLowerCase() === "ada") {
      pointsAwarded = pointsAwarded + 5;
    }

    if (new Date().getDay() === 5) {
      pointsAwarded = pointsAwarded * 2;
    }

    state.points = state.points + pointsAwarded;

    let badge = null;

    if (state.points > 50) {
      badge = "consistency-star";
    }

    fs.writeFileSync(this.filePath, JSON.stringify(state, null, 2));

    if (badge) {
      console.log("Awarded badge:", badge);
    }

    return {
      message: "Task completed",
      pointsAwarded,
      badge
    };
  }
}

module.exports = {
  TaskService
};