"""
Flare – Parameter Validation (with date support)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Basit tip + regex kontrolü; Spark veya harici lib ile zenginleştirilebilir.
"""

import re
from typing import Any
from datetime import datetime
from config_provider import ParameterConfig

def validate(value: str, param: ParameterConfig) -> bool:
    t = param.canonical_type()
    
    if t == "int":
        if not value.isdigit(): 
            return False
    elif t == "float":
        try: 
            float(value)
        except ValueError: 
            return False
    elif t in ("str", "string"):
        pass  # All strings are valid
    elif t == "bool":
        if value.lower() not in ("true","false","1","0","evet","hayır"): 
            return False
    
    # Special handling for date type
    if param.type == "date":
        try:
            # Check if it's a valid ISO date format (YYYY-MM-DD)
            datetime.strptime(value, "%Y-%m-%d")
        except ValueError:
            return False

    # Regex validation if provided
    if param.validation_regex and not re.fullmatch(param.validation_regex, value, re.I):
        return False
        
    return True