// handlers/music/composition/generateMusicLessonHandler.ts
import * as vscode from "vscode";

// ✅ UNIFIED ARCHITECTURE IMPORTS
import {
  ensureDirectoryExists,
  isBrainAvailable,
  shareAnalysisData,
} from "../../../shared/utils";

// 🧠 KEEP FOR All HANDLER FILES— Brain Enhanced
import { BrainConnector } from "../../../brain/BrainConnector";


export async function generateMusicLessonHandler(): Promise<void> {
  try {
    // Get lesson topic
    const lessonTopic = await vscode.window.showQuickPick(
      [
        "🎵 Music Theory Basics",
        "🎸 Chord Progressions",
        "🎹 Scale Patterns",
        "🎶 Rhythm & Timing",
        "🎤 Songwriting Fundamentals",
        "🎵 Harmony & Voice Leading",
        "🎸 Guitar Techniques",
        "🎹 Piano Fundamentals",
      ],
      {
        placeHolder: "Select lesson topic",
      }
    );

    if (!lessonTopic) return;

    // Get skill level
    const skillLevel = await vscode.window.showQuickPick(
      ["Absolute Beginner", "Beginner", "Intermediate", "Advanced", "Expert"],
      {
        placeHolder: "Select skill level",
      }
    );

    if (!skillLevel) return;

    // Get lesson duration
    const duration = await vscode.window.showQuickPick(
      ["15 minutes", "30 minutes", "45 minutes", "60 minutes"],
      {
        placeHolder: "Select lesson duration",
      }
    );

    if (!duration) return;

    vscode.window.showInformationMessage("🎼 Generating AI music lesson...");

    const lessonContent = await generateMusicLessonContent(
      lessonTopic,
      skillLevel,
      duration
    );

    // Create lesson file using established patterns
    await createMusicLessonFile(lessonContent, lessonTopic);

    // Share with brain
    if (isBrainAvailable()) {
      await shareAnalysisData("music-theory", {
        action: "music-lesson-generation",
        topic: lessonTopic,
        skillLevel,
        duration,
        success: true,
        timestamp: Date.now(),
      });
    }

    vscode.window.showInformationMessage("✅ Music lesson generated! 🎼");
  } catch (error) {
    const errorMessage = error instanceof Error ? error.message : String(error);
    console.error("🎼 Music lesson generation error:", error);

    await shareAnalysisData("music-theory", {
      action: "music-lesson-generation",
      success: false,
      error: errorMessage,
      timestamp: Date.now(),
    });

    vscode.window.showErrorMessage(
      `🎼 Music lesson generation failed: ${errorMessage}`
    );
  }
}

async function generateMusicLessonContent(
  topic: string,
  level: string,
  duration: string
): Promise<string> {
  const topicName = topic
    .replace(/[🎵🎸🎹🎶🎤]/g, "")
    .trim()
    .replace(/\s+/g, "");

  return `# 🎼 ${topic} - ${level} Lesson

**Duration:** ${duration}  
**Generated:** ${new Date().toLocaleDateString()}

## 📚 Lesson Overview
This AI-generated lesson covers ${topic} at a ${level.toLowerCase()} level.

## 🎯 Learning Objectives
By the end of this lesson, you will:
- Understand the fundamentals of ${topic}
- Apply practical techniques
- Practice with guided exercises
- Build confidence in your musical skills

## 📖 Lesson Content

### Part 1: Introduction (5 minutes)
- What is ${topic}?
- Why is it important?
- Key concepts to understand

### Part 2: Core Concepts (${parseInt(duration) * 0.6} minutes)
- Detailed explanation of concepts
- Visual examples and diagrams
- Audio demonstrations

### Part 3: Practice Exercises (${parseInt(duration) * 0.25} minutes)
- Guided practice activities
- Progressive difficulty exercises
- Real-time feedback

### Part 4: Review & Next Steps (${parseInt(duration) * 0.15} minutes)
- Lesson summary
- Key takeaways
- Recommended next lessons

## 🎵 Interactive Elements
- [ ] Audio playback examples
- [ ] Visual chord/scale diagrams  
- [ ] Practice timing exercises
- [ ] Progress tracking

## 📝 Notes Section
*Add your personal notes and observations here*

---
*Generated by Cipher AI Music Education System*`;
}

async function createMusicLessonFile(
  content: string,
  topic: string
): Promise<void> {
  const workspaceFolder = vscode.workspace.workspaceFolders?.[0];
  if (!workspaceFolder) {
    throw new Error("No workspace folder found");
  }

  const fileName =
    topic
      .replace(/[🎵🎸🎹🎶🎤]/g, "")
      .trim()
      .replace(/\s+/g, "") + "Lesson.md";
  const lessonsDir = vscode.Uri.joinPath(workspaceFolder.uri, "music-lessons");

  // Use established directory creation utility
  await ensureDirectoryExists(lessonsDir);

  const fileUri = vscode.Uri.joinPath(lessonsDir, fileName);
  await vscode.workspace.fs.writeFile(fileUri, Buffer.from(content));

  // Open the created file
  const doc = await vscode.workspace.openTextDocument(fileUri);
  await vscode.window.showTextDocument(doc);
}