import express from 'express';

interface PageConfig {
  id?: number;
  app_name: string;
  route_path: string;
  page_config: any;
  version?: number;
}

// BOSA SDK instance (initialized in server.js)
let bosa: any = null;

export const initPagesAPI = (bosaInstance: any) => {
  bosa = bosaInstance;
};

export const createPagesRouter = () => {
  const router = express.Router();

  router.post('/', async (req, res) => {
    try {
      const { app_name, route_path, page_config } = req.body;

      if (!app_name || !route_path || !page_config) {
        bosa?.log?.warn('CreatePage: Missing required fields');
        return res.status(400).json({ error: 'Missing required fields' });
      }

      if (!bosa) {
        return res.status(500).json({ error: 'BOSA SDK not initialized' });
      }

      // Check if page already exists
      const existing = await bosa.db
        .query('wb_pages')
        .where('app_name', '=', app_name)
        .where('route_path', '=', route_path)
        .first();

      if (existing) {
        bosa.log?.warn(
          `CreatePage: Page already exists | App: ${app_name} | Route: ${route_path}`
        );
        return res.status(409).json({ error: 'Page already exists' });
      }

      // Insert using BOSA SDK
      const id = await bosa.db.query('wb_pages').insert({
        app_name,
        route_path,
        page_config: JSON.stringify(page_config),
        version: 1,
      });

      bosa.log?.info(`CreatePage: Page created | ID: ${id} | App: ${app_name}`);

      res.status(201).json({
        id,
        app_name,
        route_path,
        page_config,
        version: 1,
      });
    } catch (error: any) {
      bosa?.log?.error(
        `CreatePage: Failed | Error: ${error.message} | App: ${req.body.app_name}`
      );
      res.status(500).json({ error: error.message });
    }
  });

  router.get('/:id', async (req, res) => {
    try {
      if (!bosa) {
        return res.status(500).json({ error: 'BOSA SDK not initialized' });
      }

      const page = await bosa.db
        .query('wb_pages')
        .where('id', '=', Number(req.params.id))
        .first();

      if (!page) {
        bosa.log?.warn(`GetPage: Page not found | ID: ${req.params.id}`);
        return res.status(404).json({ error: 'Page not found' });
      }

      const result = page as any;
      res.json({
        ...result,
        page_config: JSON.parse(result.page_config),
      });
    } catch (error: any) {
      bosa?.log?.error(
        `GetPage: Failed | ID: ${req.params.id} | Error: ${error.message}`
      );
      res.status(500).json({ error: error.message });
    }
  });

  router.put('/:id', async (req, res) => {
    try {
      if (!bosa) {
        return res.status(500).json({ error: 'BOSA SDK not initialized' });
      }

      const { page_config } = req.body;
      if (!page_config) {
        bosa.log?.warn(`UpdatePage: Missing page_config | ID: ${req.params.id}`);
        return res.status(400).json({ error: 'Missing page_config' });
      }

      const existing = await bosa.db
        .query('wb_pages')
        .where('id', '=', Number(req.params.id))
        .first();

      if (!existing) {
        bosa.log?.warn(`UpdatePage: Page not found | ID: ${req.params.id}`);
        return res.status(404).json({ error: 'Page not found' });
      }

      const newVersion = (existing.version || 1) + 1;

      await bosa.db
        .query('wb_pages')
        .where('id', '=', Number(req.params.id))
        .update({
          page_config: JSON.stringify(page_config),
          version: newVersion,
        });

      bosa.log?.info(
        `UpdatePage: Page updated | ID: ${req.params.id} | Version: ${newVersion}`
      );

      res.json({
        id: Number(req.params.id),
        page_config,
        version: newVersion,
      });
    } catch (error: any) {
      bosa?.log?.error(
        `UpdatePage: Failed | ID: ${req.params.id} | Error: ${error.message}`
      );
      res.status(500).json({ error: error.message });
    }
  });

  router.delete('/:id', async (req, res) => {
    try {
      if (!bosa) {
        return res.status(500).json({ error: 'BOSA SDK not initialized' });
      }

      const deleted = await bosa.db
        .query('wb_pages')
        .where('id', '=', Number(req.params.id))
        .delete();

      if (deleted === 0) {
        bosa.log?.warn(`DeletePage: Page not found | ID: ${req.params.id}`);
        return res.status(404).json({ error: 'Page not found' });
      }

      bosa.log?.info(`DeletePage: Page deleted | ID: ${req.params.id}`);

      res.status(204).send();
    } catch (error: any) {
      bosa?.log?.error(
        `DeletePage: Failed | ID: ${req.params.id} | Error: ${error.message}`
      );
      res.status(500).json({ error: error.message });
    }
  });

  router.get('/', async (req, res) => {
    try {
      if (!bosa) {
        return res.status(500).json({ error: 'BOSA SDK not initialized' });
      }

      const appName = req.query.app_name as string;
      let query = bosa.db.query('wb_pages');

      if (appName) {
        query = query.where('app_name', '=', appName);
      }

      const pages = await query.get();

      const results = (pages as any[]).map((page) => ({
        ...page,
        page_config: JSON.parse(page.page_config),
      }));

      res.json(results);
    } catch (error: any) {
      bosa?.log?.error(
        `ListPages: Failed | App: ${req.query.app_name} | Error: ${error.message}`
      );
      res.status(500).json({ error: error.message });
    }
  });

  return router;
};