import { Router, Request, Response } from 'express';
import { questionnaireOps, activityOps, voteOps, commentOps, participantOps, Comment, Questionnaire } from '../database.js';

// Helper to check if user can participate (write access)
function canParticipate(questionnaire: Questionnaire, req: Request): { canWrite: boolean; participantName: string | null } {
  // Check for participant token first
  const token = req.cookies.participantToken;
  if (token) {
    const participant = participantOps.findByToken(token);
    if (participant && participant.questionnaire_id === questionnaire.id) {
      return { canWrite: true, participantName: participant.name };
    }
  }
  
  // For public questionnaires, use visitor name
  if (!questionnaire.is_private) {
    const visitorName = req.cookies.visitorName;
    return { canWrite: !!visitorName, participantName: visitorName || null };
  }
  
  // Private questionnaire without valid token
  return { canWrite: false, participantName: null };
}

const router = Router();

// Access questionnaire via participant token
router.get('/token/:token', (req: Request, res: Response) => {
  const participant = participantOps.findByToken(req.params.token);
  
  if (!participant) {
    res.status(404).json({ error: 'Ongeldige toegangslink' });
    return;
  }
  
  const questionnaire = questionnaireOps.findById(participant.questionnaire_id);
  
  if (!questionnaire) {
    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
    return;
  }
  
  // Set participant token cookie
  res.cookie('participantToken', participant.token, {
    maxAge: 30 * 24 * 60 * 60 * 1000, // 30 days
    httpOnly: true,
    sameSite: 'lax',
  });
  
  const activities = activityOps.getByQuestionnaire(questionnaire.id);
  
  let userVotes: Record<number, number> = {};
  const votes = voteOps.getByQuestionnaireAndVoter(questionnaire.id, participant.name);
  votes.forEach(v => {
    userVotes[v.activity_id] = v.vote_type;
  });
  
  res.json({ 
    questionnaire, 
    activities, 
    visitorName: participant.name, 
    userVotes,
    isParticipant: true,
    canWrite: true,
  });
});

// Get questionnaire by slug (public - may be read-only for private questionnaires)
router.get('/:slug', (req: Request, res: Response) => {
  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
  
  if (!questionnaire) {
    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
    return;
  }
  
  const activities = activityOps.getByQuestionnaire(questionnaire.id);
  const { canWrite, participantName } = canParticipate(questionnaire, req);
  
  let userVotes: Record<number, number> = {};
  if (participantName) {
    const votes = voteOps.getByQuestionnaireAndVoter(questionnaire.id, participantName);
    votes.forEach(v => {
      userVotes[v.activity_id] = v.vote_type;
    });
  }
  
  res.json({ 
    questionnaire, 
    activities, 
    visitorName: participantName || '',
    userVotes,
    isPrivate: !!questionnaire.is_private,
    canWrite,
  });
});

// Set visitor name (only for public questionnaires)
router.post('/:slug/set-name', (req: Request, res: Response) => {
  const { name } = req.body;
  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
  
  if (!questionnaire) {
    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
    return;
  }
  
  if (questionnaire.is_private) {
    res.status(403).json({ error: 'Voor deze vragenlijst is een uitnodigingslink nodig' });
    return;
  }
  
  if (!name?.trim()) {
    res.status(400).json({ error: 'Naam is verplicht' });
    return;
  }
  
  res.cookie('visitorName', name.trim(), {
    maxAge: 30 * 24 * 60 * 60 * 1000, // 30 days
    httpOnly: true,
    sameSite: 'lax',
  });
  
  res.json({ success: true, name: name.trim() });
});

// Clear visitor name
router.post('/:slug/clear-name', (req: Request, res: Response) => {
  res.clearCookie('visitorName');
  res.clearCookie('participantToken');
  res.json({ success: true });
});

// Add activity
router.post('/:slug/activities', (req: Request, res: Response) => {
  const { name, description } = req.body;
  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
  
  if (!questionnaire) {
    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
    return;
  }
  
  const { canWrite, participantName } = canParticipate(questionnaire, req);
  
  if (!canWrite || !participantName) {
    if (questionnaire.is_private) {
      res.status(403).json({ error: 'Je hebt een uitnodigingslink nodig om deel te nemen' });
    } else {
      res.status(401).json({ error: 'Voer eerst je naam in' });
    }
    return;
  }
  
  if (!name?.trim()) {
    res.status(400).json({ error: 'Naam activiteit is verplicht' });
    return;
  }
  
  const activityDescription = description?.trim() || null;
  const activityId = activityOps.create(questionnaire.id, name.trim(), participantName, activityDescription);
  const activities = activityOps.getByQuestionnaire(questionnaire.id);
  const activity = activities.find(a => a.id === activityId);
  
  res.json({ success: true, activity });
});

// Update activity (only by the user who added it)
router.put('/:slug/activities/:activityId', (req: Request, res: Response) => {
  const { name, description } = req.body;
  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
  
  if (!questionnaire) {
    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
    return;
  }
  
  const { canWrite, participantName } = canParticipate(questionnaire, req);
  
  if (!canWrite || !participantName) {
    if (questionnaire.is_private) {
      res.status(403).json({ error: 'Je hebt een uitnodigingslink nodig om te bewerken' });
    } else {
      res.status(401).json({ error: 'Voer eerst je naam in' });
    }
    return;
  }
  
  const activity = activityOps.findById(parseInt(req.params.activityId));
  if (!activity || activity.questionnaire_id !== questionnaire.id) {
    res.status(404).json({ error: 'Activiteit niet gevonden' });
    return;
  }
  
  // Check if the user is the one who added the activity
  if (activity.added_by !== participantName) {
    res.status(403).json({ error: 'Je kunt alleen je eigen activiteiten bewerken' });
    return;
  }
  
  if (!name?.trim()) {
    res.status(400).json({ error: 'Naam activiteit is verplicht' });
    return;
  }
  
  activityOps.update(activity.id, name.trim(), description?.trim() || null);
  const activities = activityOps.getByQuestionnaire(questionnaire.id);
  const updatedActivity = activities.find(a => a.id === activity.id);
  
  res.json({ success: true, activity: updatedActivity });
});

// Vote on activity
router.post('/:slug/activities/:activityId/vote', (req: Request, res: Response) => {
  const { voteType } = req.body;
  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
  
  if (!questionnaire) {
    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
    return;
  }
  
  const { canWrite, participantName } = canParticipate(questionnaire, req);
  
  if (!canWrite || !participantName) {
    if (questionnaire.is_private) {
      res.status(403).json({ error: 'Je hebt een uitnodigingslink nodig om te stemmen' });
    } else {
      res.status(401).json({ error: 'Voer eerst je naam in' });
    }
    return;
  }
  
  const activity = activityOps.findById(parseInt(req.params.activityId));
  if (!activity || activity.questionnaire_id !== questionnaire.id) {
    res.status(404).json({ error: 'Activiteit niet gevonden' });
    return;
  }
  
  if (voteType !== 1 && voteType !== -1) {
    res.status(400).json({ error: 'Ongeldig stemtype' });
    return;
  }
  
  const result = voteOps.upsert(activity.id, participantName, voteType);
  const activities = activityOps.getByQuestionnaire(questionnaire.id);
  const updatedActivity = activities.find(a => a.id === activity.id);
  
  res.json({
    success: true,
    action: result.action,
    currentVote: result.voteType,
    activity: updatedActivity,
  });
});

// Get activities
router.get('/:slug/activities', (req: Request, res: Response) => {
  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
  
  if (!questionnaire) {
    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
    return;
  }
  
  const activities = activityOps.getByQuestionnaire(questionnaire.id);
  const visitorName = req.cookies.visitorName || '';
  
  let userVotes: Record<number, number> = {};
  if (visitorName) {
    const votes = voteOps.getByQuestionnaireAndVoter(questionnaire.id, visitorName);
    votes.forEach(v => {
      userVotes[v.activity_id] = v.vote_type;
    });
  }
  
  res.json({ activities, userVotes });
});

// Get comments for an activity
router.get('/:slug/activities/:activityId/comments', (req: Request, res: Response) => {
  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
  
  if (!questionnaire) {
    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
    return;
  }
  
  const activity = activityOps.findById(parseInt(req.params.activityId));
  if (!activity || activity.questionnaire_id !== questionnaire.id) {
    res.status(404).json({ error: 'Activiteit niet gevonden' });
    return;
  }
  
  const comments = commentOps.getByActivity(activity.id);
  
  // Build nested comment tree
  const commentMap: Record<number, Comment> = {};
  const rootComments: Comment[] = [];
  
  comments.forEach(comment => {
    comment.replies = [];
    commentMap[comment.id] = comment;
  });
  
  comments.forEach(comment => {
    if (comment.parent_id) {
      if (commentMap[comment.parent_id]) {
        commentMap[comment.parent_id].replies!.push(comment);
      }
    } else {
      rootComments.push(comment);
    }
  });
  
  res.json({ comments: rootComments, activity });
});

// Add a comment
router.post('/:slug/activities/:activityId/comments', (req: Request, res: Response) => {
  const { content, parentId } = req.body;
  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
  
  if (!questionnaire) {
    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
    return;
  }
  
  const { canWrite, participantName } = canParticipate(questionnaire, req);
  
  if (!canWrite || !participantName) {
    if (questionnaire.is_private) {
      res.status(403).json({ error: 'Je hebt een uitnodigingslink nodig om te reageren' });
    } else {
      res.status(401).json({ error: 'Voer eerst je naam in' });
    }
    return;
  }
  
  const activity = activityOps.findById(parseInt(req.params.activityId));
  if (!activity || activity.questionnaire_id !== questionnaire.id) {
    res.status(404).json({ error: 'Activiteit niet gevonden' });
    return;
  }
  
  if (!content?.trim()) {
    res.status(400).json({ error: 'Reactie inhoud is verplicht' });
    return;
  }
  
  if (parentId) {
    const parentComment = commentOps.getById(parentId);
    if (!parentComment || parentComment.activity_id !== activity.id) {
      res.status(400).json({ error: 'Ongeldige reactie om op te reageren' });
      return;
    }
  }
  
  const commentId = commentOps.create(activity.id, participantName, content.trim(), parentId || null);
  const comment = commentOps.getById(commentId);
  
  res.json({ success: true, comment: { ...comment, replies: [] } });
});

export default router;