import chalk from 'chalk';
import fs from 'fs-extra';
import path from 'path';
import { runVersionMigration } from '../engine/version-runner.js';
import { printTerminalSummary } from "../reporting/terminal-summary.js";

export async function runLogsMode(currentVersion: number, targetVersion: number) {
  console.log(chalk.cyanBright('\n📊 LOGS-ONLY MODE — No automatic fixes will be applied.'));

  if (targetVersion <= currentVersion) {
    console.log(chalk.red(`❌ Target version must be higher than current version (${currentVersion}).`));
    process.exit(1);
  }

  const logsDir = path.join(process.cwd(), 'migration-logs');
  await fs.ensureDir(logsDir);

  for (let v = currentVersion; v < targetVersion; v++) {
    const nextVersion = v + 1;
    const step = `${v} → ${nextVersion}`;
    console.log(chalk.blueBright(`\n🔎 Analyzing ${step} ...`));

    try {
      const analysisResult = await runVersionMigration(v, nextVersion);

      const logFile = path.join(logsDir, `${v}-to-${nextVersion}-report.md`);
      await fs.writeFile(logFile, analysisResult.logContent);
      
      console.log(chalk.green(`📄 Log saved: migration-logs/${v}-to-${nextVersion}-report.md`));

      // ⬇ ADD SUMMARY HERE — uses variables inside this loop (so no TS error)
      printTerminalSummary({
        fromVersion: v,
        toVersion: nextVersion,
        deprecatedItems: analysisResult.deprecatedItems,
        autoFixes: analysisResult.autoFixTargets
      });

    } catch (err) {
      console.error(chalk.red(`💥 Analysis failed at step ${step}`));
      console.error(err);
      return;
    }
  }

  console.log(chalk.magentaBright(`\n✨ Log analysis completed!`));
  console.log(chalk.yellow(`📂 Check the "migration-logs/" directory for full reports.`));
}