import { readdir, readFile } from 'node:fs/promises';
import { join } from 'node:path';

interface FileStructure {
  filename: string;
  rootKeys: string[];
  structureKey: string; // normalized structure identifier
  hasContent: boolean;
  error?: string;
}

async function analyzeJsonFiles(): Promise<void> {
  const dirPath = join(import.meta.dirname || import.meta.dirname);
  const files = await readdir(dirPath);
  const jsonFiles = files.filter((f) => f.endsWith('.json'));

  console.log(`\n📊 Analyzing ${jsonFiles.length} JSON files...\n`);

  const structures: FileStructure[] = [];

  // Read and analyze each JSON file
  for (const filename of jsonFiles) {
    const filePath = join(dirPath, filename);
    try {
      const content = await readFile(filePath, 'utf-8');

      if (!content.trim()) {
        structures.push({
          filename,
          rootKeys: [],
          structureKey: 'empty',
          hasContent: false,
          error: 'File is empty',
        });
        continue;
      }

      const data = JSON.parse(content);
      const rootKeys = Object.keys(data).sort();
      const structureKey = rootKeys.join('|');

      structures.push({
        filename,
        rootKeys,
        structureKey,
        hasContent: true,
      });
    } catch (error) {
      structures.push({
        filename,
        rootKeys: [],
        structureKey: 'error',
        hasContent: false,
        error: error instanceof Error ? error.message : String(error),
      });
    }
  }

  // Group files by structure
  const groups = new Map<string, FileStructure[]>();
  for (const structure of structures) {
    const key = structure.structureKey;
    if (!groups.has(key)) {
      groups.set(key, []);
    }
    groups.get(key)!.push(structure);
  }

  // Display results
  const separator = '='.repeat(80);
  console.log(separator);
  console.log('📋 ALL ROOT KEYS FOUND ACROSS ALL FILES:');
  console.log(separator);

  const allKeys = new Set<string>();
  structures.forEach((s) => {
    s.rootKeys.forEach((k) => allKeys.add(k));
  });

  const sortedKeys = Array.from(allKeys).sort();
  sortedKeys.forEach((key) => {
    const filesWithKey = structures.filter((s) => s.rootKeys.includes(key));
    console.log(`  ✓ ${key.padEnd(30)} (in ${filesWithKey.length} files)`);
  });

  console.log(`\n${separator}`);
  console.log('📦 FILES GROUPED BY STRUCTURE:');
  console.log(separator);

  const sortedGroups = Array.from(groups.entries()).sort(
    (a, b) => b[1].length - a[1].length
  );

  sortedGroups.forEach(([structureKey, files], index) => {
    const fileCount = files.length;
    const plural = fileCount > 1 ? 's' : '';
    console.log(`\n🔹 Group ${index + 1} (${fileCount} file${plural}):`);
    console.log(`   Structure: ${structureKey || '(empty/error)'}`);

    if (files[0].rootKeys.length > 0) {
      console.log(`   Root keys: ${files[0].rootKeys.join(', ')}`);
    }

    console.log('   Files:');
    files.forEach((file) => {
      const status = file.hasContent ? '✓' : file.error ? '✗' : '○';
      console.log(`     ${status} ${file.filename}`);
      if (file.error) {
        console.log(`       Error: ${file.error}`);
      }
    });
  });

  // Validation summary
  console.log(`\n${separator}`);
  console.log('✅ VALIDATION SUMMARY:');
  console.log(separator);

  const validFiles = structures.filter((s) => s.hasContent && !s.error);
  const emptyFiles = structures.filter((s) => !(s.hasContent || s.error));
  const errorFiles = structures.filter((s) => s.error);

  console.log(`  Total files: ${structures.length}`);
  const validCount = validFiles.length;
  const emptyCount = emptyFiles.length;
  const errorCount = errorFiles.length;
  console.log(`  ✓ Valid JSON files: ${validCount}`);
  console.log(`  ○ Empty files: ${emptyCount}`);
  console.log(`  ✗ Files with errors: ${errorCount}`);

  if (validFiles.length > 0) {
    const uniqueStructures = new Set(validFiles.map((s) => s.structureKey));
    const uniqueCount = uniqueStructures.size;
    console.log(`\n  📊 Unique structures: ${uniqueCount}`);

    if (uniqueCount > 1) {
      console.log('\n  ⚠️  WARNING: Files have inconsistent structures!');
      console.log(`     Found ${uniqueCount} different structure(s).`);
    } else {
      console.log('\n  ✓ All valid files have consistent structure!');
    }
  }

  // Show structure differences in detail
  if (sortedGroups.length > 1) {
    console.log(`\n${separator}`);
    console.log('🔍 STRUCTURE DIFFERENCES:');
    console.log(separator);

    sortedGroups.forEach(([structureKey, files], index) => {
      if (structureKey === 'empty' || structureKey === 'error') {
        return;
      }

      const groupNum = index + 1;
      console.log(`\nGroup ${groupNum} structure:`);
      const sample = files[0];
      sample.rootKeys.forEach((key) => {
        console.log(`  - ${key}`);
      });
    });
  }

  console.log(`\n${separator}\n`);
}

// Run the analysis
analyzeJsonFiles().catch(console.error);