# encoding: utf-8
"""
Updated StringConstructorFormatter with template sanitization
"""

import typing as _t
import re as _re
from inspect import cleandoc as _cleandoc
import sys as _sys

from frozendict import deepfreeze as _deepfreeze
from comfy.comfy_types.node_typing import IO as _IO

from . import _meta
from .docstring_formatter import format_docstring as _format_docstring
from .enums import DataTypes as _DataTypes
from .funcs_common import _show_text_on_node, _verify_input_dict

_RECURSION_LIMIT = max(int(_sys.getrecursionlimit()), 1)

def _safe_format(template: str, format_dict: _t.Dict[str, _t.Any]) -> str:
    """
    Safe format that only replaces variables that exist in the dictionary.
    Leaves other curly brackets untouched.
    """
    if not format_dict:
        return template
    
    # Create pattern that matches {key} only for keys that exist in format_dict
    pattern = r'\{(' + '|'.join(_re.escape(key) for key in format_dict.keys()) + r')\}'
    
    def replace_func(match):
        key = match.group(1)
        return str(format_dict[key])
    
    return _re.sub(pattern, replace_func, template)

def _escape_unknown_brackets(template: str, format_dict: _t.Dict[str, _t.Any]) -> str:
    """
    Escape curly brackets that aren't format variables, then use normal format.
    This approach preserves the original behavior for known variables.
    """
    if not format_dict:
        # If no format dict, escape all curly brackets
        return template.replace('{', '{{').replace('}', '}}')
    
    # Find all {word} patterns
    pattern = r'\{([^{}]*)\}'
    known_keys = set(format_dict.keys())
    
    def escape_func(match):
        key = match.group(1)
        if key in known_keys:
            return match.group(0)  # Keep as is for formatting
        else:
            return '{{' + key + '}}'  # Escape unknown
    
    escaped_template = _re.sub(pattern, escape_func, template)
    return escaped_template.format_map(format_dict)

def _recursive_format_safe(template: str, format_dict: _t.Dict[str, _t.Any], show: bool = True, unique_id: str = None, use_safe_mode: bool = True) -> str:
    """
    Safe recursive format that won't break on unknown curly brackets.
    """
    assert isinstance(_RECURSION_LIMIT, int) and _RECURSION_LIMIT > 0

    prev: str = ''
    new: str = template
    
    for i in range(_RECURSION_LIMIT):
        if prev == new:
            break
        prev = new
        
        if use_safe_mode:
            new = _safe_format(new, format_dict)
        else:
            # Use the escape approach for compatibility with original behavior
            new = _escape_unknown_brackets(new, format_dict)
    
    if prev == new:
        return new

    msg = (
        f"Recursion limit ({_RECURSION_LIMIT}) reached on attempt to format a string: {template!r}\n"
        f"Last two formatting attempts:\n{prev!r}\n{new!r}"
    )
    if show and unique_id:
        _show_text_on_node(msg, unique_id)
    raise RecursionError(msg)

# Updated input types with new sanitization option
_input_types = _deepfreeze({
    'required': {
        'template': (_IO.STRING, {'multiline': True, 'tooltip': (
            "Type the text template. "
            "To reference named substrings from format-dictionary, use this syntax: {substring_name}. For example:\n\n"
            "score_9, score_8_up, score_7_up, {char1_short}, standing next to {char2_short},\n"
            "{char1_long}\n{char2_long}\n\n"
            "Curly brackets that don't match dictionary keys will be handled according to the sanitization mode."
        )}),
        'recursive_format': (_IO.BOOLEAN, {'default': False, 'label_on': '❗ yes', 'label_off': 'no', 'tooltip': (
            "Do recursive format - i.e., allow the chunks from the dictionary to reference other chunks."
        )}),
        'safe_mode': (_IO.BOOLEAN, {'default': True, 'label_on': 'safe', 'label_off': 'escape', 'tooltip': (
            "Safe mode: Only format known variables, leave unknown {brackets} as-is.\n"
            "Escape mode: Escape unknown {brackets} to {{brackets}} then format normally.\n"
            "Safe mode is recommended for templates with JSON, CSS, or other literal curly brackets."
        )}),
        'show_status': (_IO.BOOLEAN, {'default': True, 'label_on': 'formatted string', 'label_off': 'no', 'tooltip': (
            "Show the final string constructed from the text-template and format-dictionary?"
        )}),
    },
    'optional': {
        'dict': _DataTypes.input_dict(tooltip=(
            "The dictionary to take named sub-strings from. It could be left unconnected, if the pattern doesn't reference "
            "any sub-strings - then, this node acts exactly the same as a regular string-primitive node."
        )),
    },
    'hidden': {
        'unique_id': 'UNIQUE_ID',
    },
})

class StringConstructorFormatter:
    """
    Construct the formatted string from template and format-dictionary.
    Now with safe handling of curly brackets that aren't format variables.
    """
    NODE_NAME = 'StringConstructorFormatter'
    CATEGORY = _meta.category
    DESCRIPTION = _format_docstring(_cleandoc(__doc__))

    OUTPUT_NODE = True

    FUNCTION = 'main'
    RETURN_TYPES = (_IO.STRING, )
    RETURN_NAMES = ('string', )

    @classmethod
    def INPUT_TYPES(cls):
        return _input_types

    @staticmethod
    def main(
        template: str, 
        recursive_format: bool = False, 
        safe_mode: bool = True,
        show_status: bool = False, 
        dict: _t.Dict[str, _t.Any] = None,
        unique_id: str = None
    ) -> _t.Tuple[str]:
        
        if dict is None:
            dict = {}
        _verify_input_dict(dict)
        
        if not isinstance(template, str):
            raise TypeError(f"Not a string: {template!r}")

        if recursive_format:
            out_text = _recursive_format_safe(template, dict, show_status, unique_id, safe_mode)
        else:
            if safe_mode:
                out_text = _safe_format(template, dict)
            else:
                out_text = _escape_unknown_brackets(template, dict)
        
        if show_status and unique_id:
            _show_text_on_node(out_text, unique_id)
        
        return (out_text, )