const express = require('express');
const { body } = require('express-validator');
const Games = require('../models/games');
const { pool } = require('../models/db');
const { authenticate } = require('../middleware/auth');
const validate = require('../middleware/validate');
const { generateGame, regenerateGame } = require('../utils/claude');

const router = express.Router();

// Create game with AI
router.post('/create',
  authenticate,
  validate([
    body('description')
      .trim()
      .isLength({ min: 10, max: 1000 })
      .withMessage('Game description must be 10-1000 characters'),
    body('title')
      .optional()
      .trim()
      .isLength({ min: 1, max: 100 })
  ]),
  async (req, res, next) => {
    try {
      const { description, title } = req.body;

      // Check if user is a guest
      if (req.user.is_guest) {
        return res.status(403).json({
          error: 'Guests cannot create games. Please create an account first.'
        });
      }

      // Generate game with Claude
      const result = await generateGame(description);

      if (!result.success) {
        return res.status(500).json({ error: 'Failed to generate game. Please try again.' });
      }

      // Create game in database
      const gameTitle = title || `Game by ${req.user.username}`;
      const game = await Games.create({
        creatorId: req.user.id,
        title: gameTitle,
        description: description,
        gameCode: result.code,
        prompt: description
      });

      res.status(201).json({
        message: 'Game created successfully',
        game: {
          id: game.id,
          title: game.title,
          description: game.description,
          status: game.status,
          createdAt: game.created_at
        },
        previewCode: result.code,
        tokensUsed: result.tokensUsed || 0
      });
    } catch (error) {
      next(error);
    }
  }
);

// Get game by ID
router.get('/:gameId',
  authenticate,
  async (req, res, next) => {
    try {
      const { gameId } = req.params;
      const game = await Games.findById(gameId);

      if (!game) {
        return res.status(404).json({ error: 'Game not found' });
      }

      // Only show code if owner or game is published
      const isOwner = game.creator_id === req.user.id;
      const isPublished = game.status === 'published';

      if (!isOwner && !isPublished) {
        return res.status(403).json({ error: 'Game not available' });
      }

      // Prevent caching of game code responses
      res.set({
        'Cache-Control': 'no-store, no-cache, must-revalidate, proxy-revalidate',
        'Pragma': 'no-cache',
        'Expires': '0'
      });

      res.json({
        game: {
          id: game.id,
          title: game.title,
          description: game.description,
          gameCode: game.game_code,
          codeVersion: game.code_version || 1,
          prompt: game.prompt,
          creationPrompt: game.creation_prompt,
          originalPrompt: game.original_prompt,
          promptWasEdited: game.prompt_was_edited || false,
          promptEditCount: game.prompt_edit_count || 0,
          promptAnswers: game.prompt_answers,
          status: game.status,
          playCount: game.play_count,
          totalRatings: game.total_ratings,
          ratingSum: game.rating_sum,
          creatorId: game.creator_id,
          creatorUsername: game.creator_username,
          creatorDisplayName: game.creator_display_name,
          createdAt: game.created_at,
          publishedAt: game.published_at,
          creatorPlayed: game.creator_played,
          creatorPlayDuration: game.creator_play_duration || 0,
          isOwner
        }
      });
    } catch (error) {
      next(error);
    }
  }
);

// Update game
router.put('/:gameId',
  authenticate,
  validate([
    body('title').optional().trim().isLength({ min: 1, max: 100 }),
    body('description').optional().trim().isLength({ min: 10, max: 1000 }),
    body('feedback').optional().trim().isLength({ min: 5, max: 1000 })
  ]),
  async (req, res, next) => {
    try {
      const { gameId } = req.params;
      const { title, description, feedback } = req.body;

      const game = await Games.findById(gameId);

      if (!game) {
        return res.status(404).json({ error: 'Game not found' });
      }

      if (game.creator_id !== req.user.id) {
        return res.status(403).json({ error: 'Not authorized' });
      }

      if (game.status === 'published') {
        return res.status(400).json({ error: 'Cannot edit published games' });
      }

      let updatedCode = game.game_code;
      let tokensUsed = 0;

      // If feedback provided, regenerate with Claude
      if (feedback) {
        const result = await regenerateGame(game.game_code, feedback);
        if (result.success) {
          updatedCode = result.code;
          tokensUsed = result.tokensUsed || 0;
        } else {
          return res.status(500).json({ error: 'Failed to regenerate game. Please try again.' });
        }
      }

      const updated = await Games.update(gameId, {
        title,
        description,
        gameCode: feedback ? updatedCode : undefined
      });

      res.json({
        message: 'Game updated',
        game: {
          id: updated.id,
          title: updated.title,
          description: updated.description,
          status: updated.status,
          gameCode: updated.game_code
        },
        tokensUsed
      });
    } catch (error) {
      next(error);
    }
  }
);

// Submit for review
router.post('/:gameId/submit',
  authenticate,
  async (req, res, next) => {
    try {
      const { gameId } = req.params;
      const game = await Games.findById(gameId);

      if (!game) {
        return res.status(404).json({ error: 'Game not found' });
      }

      if (game.creator_id !== req.user.id) {
        return res.status(403).json({ error: 'Not authorized' });
      }

      if (game.status !== 'draft') {
        return res.status(400).json({ error: 'Game has already been submitted' });
      }

      const updated = await Games.submit(gameId);

      res.json({
        message: 'Game submitted for review',
        game: { id: updated.id, status: updated.status }
      });
    } catch (error) {
      next(error);
    }
  }
);

// Unpublish game (creator only)
router.post('/:gameId/unpublish',
  authenticate,
  async (req, res, next) => {
    try {
      const { gameId } = req.params;
      const game = await Games.findById(gameId);

      if (!game) {
        return res.status(404).json({ error: 'Game not found' });
      }

      if (game.creator_id !== req.user.id) {
        return res.status(403).json({ error: 'Not authorized' });
      }

      if (game.status !== 'published') {
        return res.status(400).json({ error: 'Game is not published' });
      }

      // Unpublish - set status back to testing so they can re-publish
      await pool.query(
        `UPDATE games SET status = 'testing', published_at = NULL WHERE id = $1`,
        [gameId]
      );

      res.json({
        message: 'Game unpublished. You can edit and re-publish it.',
        game: { id: parseInt(gameId), status: 'testing' }
      });
    } catch (error) {
      next(error);
    }
  }
);

// Delete game
router.delete('/:gameId',
  authenticate,
  async (req, res, next) => {
    try {
      const { gameId } = req.params;
      const game = await Games.findById(gameId);

      if (!game) {
        return res.status(404).json({ error: 'Game not found' });
      }

      if (game.creator_id !== req.user.id && req.user.role !== 'admin') {
        return res.status(403).json({ error: 'Not authorized' });
      }

      await Games.delete(gameId);

      res.json({ message: 'Game deleted' });
    } catch (error) {
      next(error);
    }
  }
);

module.exports = router;