export const runtime = "nodejs";
import { auth } from '@/auth';
import { NextResponse } from 'next/server';
import { createBackup, listBackups, restoreBackup } from '@/src/lib/config/backup-config';
import { backupConfig, exportConfig, importConfig, loadFullConfig, saveAppConfig, saveServices } from '@/src/lib/config';
import { appConfigSchema, servicesArraySchema } from '@/src/lib/config/schema';
import { CONFIG_FILE_PATH } from '@/src/lib/config/paths';
import { resolveProjectPath } from '@/src/lib/config/load-config';
import { promises as fs } from 'fs';
import path from 'path';

const CONFIG_PATH = CONFIG_FILE_PATH;

function jsonError(message: string, status: number) {
  return NextResponse.json({ error: message }, { status });
}

function normalizePath(pathname: string) {
  return pathname.replace(/\/+$/, '');
}

async function requireAuth() {
  const session = await auth();
  if (!session) {
    return null;
  }
  return session;
}

export async function GET(request: Request) {
  const pathname = new URL(request.url).pathname;
  const cleanPath = normalizePath(pathname);

  if (cleanPath === '/api/config') {
    const session = await requireAuth();
    if (!session) {
      return jsonError('Unauthorized', 401);
    }

    try {
      const result = await loadFullConfig();
      return NextResponse.json(result);
    } catch (error) {
      console.error('GET /api/config failed:', error);
      return jsonError('Failed to load configuration', 500);
    }
  }

  if (cleanPath === '/api/config/backups') {
    const session = await requireAuth();
    if (!session) {
      return jsonError('Unauthorized', 401);
    }

    try {
      const backups = await listBackups();
      return NextResponse.json({ backups });
    } catch (error) {
      console.error('GET /api/config/backups failed:', error);
      return jsonError('Failed to list backups', 500);
    }
  }

  if (cleanPath === '/api/config/export') {
    const session = await requireAuth();
    if (!session) {
      return jsonError('Unauthorized', 401);
    }

    try {
      const payload = await exportConfig();
      const body = JSON.stringify(payload, null, 2);
      return new NextResponse(body, {
        status: 200,
        headers: {
          'Content-Type': 'application/json',
          'Content-Disposition': `attachment; filename="homelab-config-export-${new Date().toISOString().replace(/[:.]/g, '-')}.json"`,
        },
      });
    } catch (error) {
      console.error('GET /api/config/export failed:', error);
      return jsonError('Failed to export configuration', 500);
    }
  }

  return jsonError('Not found', 404);
}

export async function POST(request: Request) {
  const session = await requireAuth();
  if (!session) {
    return jsonError('Unauthorized', 401);
  }

  const pathname = new URL(request.url).pathname;
  const cleanPath = normalizePath(pathname);

  if (cleanPath === '/api/config/backup') {
    try {
      const backupFile = await createBackup();
      return NextResponse.json({
        success: true,
        message: 'Backup created successfully',
        backupFilename: path.basename(backupFile),
      });
    } catch (error) {
      console.error('POST /api/config/backup failed:', error);
      return jsonError(
        error instanceof Error ? error.message : 'Failed to create backup',
        500
      );
    }
  }

  if (cleanPath === '/api/config/import') {
    let payload: unknown;

    try {
      const contentType = request.headers.get('content-type') || '';
      if (contentType.includes('multipart/form-data')) {
        const formData = await request.formData();
        const file = formData.get('file');
        if (!(file instanceof File)) {
          return jsonError('No file uploaded', 400);
        }

        const fileText = await file.text();
        payload = JSON.parse(fileText);
      } else {
        payload = await request.json();
      }
    } catch (error) {
      return jsonError(
        'Request body must be valid JSON or a valid JSON upload',
        400
      );
    }

    try {
      await importConfig(payload);
      return NextResponse.json({
        success: true,
        message: 'Configuration imported successfully',
      });
    } catch (error) {
      console.error('POST /api/config/import failed:', error);
      return jsonError(
        error instanceof Error ? error.message : 'Failed to import configuration',
        400
      );
    }
  }

  if (cleanPath === '/api/config/restore') {
    let payload: any;
    try {
      payload = await request.json();
    } catch (error) {
      return jsonError('Request body must be valid JSON', 400);
    }

    const { backupFilename } = payload;

    if (!backupFilename || typeof backupFilename !== 'string') {
      return jsonError('backupFilename is required and must be a string', 400);
    }

    if (
      !backupFilename.startsWith('config-backup-') ||
      !backupFilename.endsWith('.json') ||
      backupFilename.includes('/') ||
      backupFilename.includes('\\')
    ) {
      return jsonError('Invalid backup filename format', 400);
    }

    try {
      await restoreBackup(backupFilename);
      return NextResponse.json({
        success: true,
        message: 'Configuration restored successfully',
      });
    } catch (error) {
      console.error('POST /api/config/restore failed:', error);
      return jsonError(
        error instanceof Error ? error.message : 'Failed to restore backup',
        500
      );
    }
  }

  return jsonError('Not found', 404);
}

export async function PUT(request: Request) {
  const session = await requireAuth();
  if (!session) {
    return jsonError('Unauthorized', 401);
  }

  const pathname = new URL(request.url).pathname;
  const cleanPath = normalizePath(pathname);

  if (cleanPath !== '/api/config') {
    return jsonError('Not found', 404);
  }

  let payload: any;

  try {
    payload = await request.json();
  } catch (error) {
    return jsonError('Request body must be valid JSON', 400);
  }

  const appConfigResult = appConfigSchema.safeParse(payload.appConfig);
  if (!appConfigResult.success) {
    return jsonError(
      `App config validation failed: ${appConfigResult.error.message}`,
      400
    );
  }

  const servicesResult = servicesArraySchema.safeParse(payload.services);
  if (!servicesResult.success) {
    return jsonError(
      `Services validation failed: ${servicesResult.error.message}`,
      400
    );
  }

  try {
    await fs.access(CONFIG_PATH);
    await backupConfig();
  } catch (error) {
    // ignore missing config file
  }

  try {
    const servicesPath = resolveProjectPath(appConfigResult.data.servicesFile);
    await saveAppConfig(appConfigResult.data, CONFIG_PATH);
    await saveServices(servicesResult.data, servicesPath);
    return NextResponse.json({ success: true });
  } catch (error) {
    console.error('PUT /api/config failed:', error);
    return jsonError('Failed to save configuration', 500);
  }
}