# -*- coding: utf-8 -*-
import json, csv, copy, random
from collections import defaultdict

def validate_stage(stage):
    grid_size = stage['gridSize']
    clues = stage['clues']
    grid = {}
    
    if len(clues) < 3:
        return False, f"Stage {stage.get('stageNumber')}: Too few clues ({len(clues)})"
        
    word_connections = {c['id']: set() for c in clues}
    
    for clue in clues:
        word = clue['word']
        length = clue['length']
        r = clue['startRow']
        c = clue['startCol']
        direction = clue['direction']
        
        if len(word) != length:
            return False, f"Stage {stage.get('stageNumber')} Clue {clue['id']}: word '{word}' len {len(word)} != length {length}"
        if length < 2:
            return False, f"Stage {stage.get('stageNumber')} Clue {clue['id']}: 1-letter word '{word}' not allowed"
            
        for i, ch in enumerate(word):
            curr_r = r + (i if direction == 'DOWN' else 0)
            curr_c = c + (i if direction == 'ACROSS' else 0)
            
            if curr_r < 0 or curr_r >= grid_size or curr_c < 0 or curr_c >= grid_size:
                return False, f"Stage {stage.get('stageNumber')} Clue {clue['id']}: '{word}' char '{ch}' at ({curr_r}, {curr_c}) out of bounds ({grid_size}x{grid_size})"
                
            if (curr_r, curr_c) in grid:
                existing_ch, existing_id = grid[(curr_r, curr_c)]
                if existing_ch != ch:
                    return False, f"Stage {stage.get('stageNumber')} CLASH at ({curr_r}, {curr_c}): existing '{existing_ch}' ({existing_id}) vs '{ch}' in {clue['id']} ('{word}')"
                word_connections[clue['id']].add(existing_id)
                word_connections[existing_id].add(clue['id'])
            else:
                grid[(curr_r, curr_c)] = (ch, clue['id'])

    for cid, conns in word_connections.items():
        if not conns:
            return False, f"Stage {stage.get('stageNumber')} Clue {cid} has no intersections!"

    return True, "OK"

print("Test generator script ready.")