from __future__ import annotations

from typing import Dict, Any, List, Callable
import logging
from rich.console import Console
from rich.prompt import Prompt, Confirm, IntPrompt
from rich.table import Table

from .display import DisplayManager
from .variables import Variable, VariableCollection

logger = logging.getLogger(__name__)


# ---------------------------
# SECTION: PromptHandler Class
# ---------------------------

class PromptHandler:
  """Simple interactive prompt handler for collecting template variables."""

  def __init__(self) -> None:
    self.console = Console()
    self.display = DisplayManager()

  # --------------------------
  # SECTION: Public Methods
  # --------------------------

  def collect_variables(self, variables: VariableCollection) -> dict[str, Any]:
    """Collect values for variables by iterating through sections.
    
    Args:
        variables: VariableCollection with organized sections and variables
        
    Returns:
        Dict of variable names to collected values
    """
    if not Confirm.ask("Customize any settings?", default=False):
      logger.info("User opted to keep all default values")
      return {}

    collected: Dict[str, Any] = {}

    # Process each section
    for section_key, section in variables.get_sections().items():
      if not section.variables:
        continue

      # Check if dependencies are satisfied
      if not variables.is_section_satisfied(section_key):
        # Get list of unsatisfied dependencies for better user feedback
        unsatisfied = [dep for dep in section.needs if not variables.is_section_satisfied(dep)]
        dep_names = ", ".join(unsatisfied) if unsatisfied else "unknown"
        self.console.print(
          f"\n[dim]⊘ {section.title} (skipped - requires {dep_names} to be enabled)[/dim]"
        )
        logger.debug(f"Skipping section '{section_key}' - dependencies not satisfied: {dep_names}")
        continue

      # Always show section header first
      self.display.display_section_header(section.title, section.description)

      # Handle section toggle - skip for required sections
      if section.required:
        # Required sections are always processed, no toggle prompt needed
        logger.debug(f"Processing required section '{section.key}' without toggle prompt")
      elif section.toggle:
        toggle_var = section.variables.get(section.toggle)
        if toggle_var:
          # Use description for prompt if available, otherwise use title
          prompt_text = section.description if section.description else f"Enable {section.title}?"
          current_value = toggle_var.get_typed_value()
          new_value = self._prompt_bool(prompt_text, current_value)
          
          if new_value != current_value:
            collected[toggle_var.name] = new_value
            toggle_var.value = new_value
          
          # Use section's native is_enabled() method
          if not section.is_enabled():
            continue

      # Collect variables in this section
      for var_name, variable in section.variables.items():
        # Skip toggle variable (already handled)
        if section.toggle and var_name == section.toggle:
          continue
          
        current_value = variable.get_typed_value()
        # Pass section.required so _prompt_variable can enforce required inputs
        new_value = self._prompt_variable(variable, required=section.required)
        
        if new_value != current_value:
          collected[var_name] = new_value
          variable.value = new_value

    logger.info(f"Variable collection completed. Collected {len(collected)} values")
    return collected

  # !SECTION

  # ---------------------------
  # SECTION: Private Methods
  # ---------------------------

  def _prompt_variable(self, variable: Variable, required: bool = False) -> Any:
    """Prompt for a single variable value based on its type."""
    logger.debug(f"Prompting for variable '{variable.name}' (type: {variable.type})")
    
    # Use variable's native methods for prompt text and default value
    prompt_text = variable.get_prompt_text()
    default_value = variable.get_normalized_default()

    # If variable is required and there's no default, mark it in the prompt
    # (but skip this for autogenerated variables since they can be empty)
    if required and default_value is None and not variable.autogenerated:
      prompt_text = f"{prompt_text} [bold red]*required[/bold red]"

    handler = self._get_prompt_handler(variable)

    # Add validation hint (includes both extra text and enum options)
    hint = variable.get_validation_hint()
    if hint:
      prompt_text = f"{prompt_text} [dim]{hint}[/dim]"

    while True:
      try:
        raw = handler(prompt_text, default_value)
        # Convert/validate the user's input using the Variable conversion
        converted = variable.convert(raw)

        # Allow empty values for autogenerated variables
        if variable.autogenerated and (converted is None or (isinstance(converted, str) and converted == "")):
          return None  # Return None to indicate auto-generation should happen
        
        # If this variable is required, do not accept None/empty values
        if required and (converted is None or (isinstance(converted, str) and converted == "")):
          raise ValueError("value cannot be empty for required variable")

        # Return the converted value (caller will update variable.value)
        return converted
      except ValueError as exc:
        # Conversion/validation failed — show a consistent error message and retry
        self._show_validation_error(str(exc))
      except Exception as e:
        # Unexpected error — log and retry using the stored (unconverted) value
        logger.error(f"Error prompting for variable '{variable.name}': {str(e)}")
        default_value = variable.value
        handler = self._get_prompt_handler(variable)

  def _get_prompt_handler(self, variable: Variable) -> Callable:
    """Return the prompt function for a variable type."""
    handlers = {
      "bool": self._prompt_bool,
      "int": self._prompt_int,
      # For enum prompts we pass the variable.extra through so options and extra
      # can be combined into a single inline hint.
      "enum": lambda text, default: self._prompt_enum(text, variable.options or [], default, extra=getattr(variable, 'extra', None)),
    }
    return handlers.get(variable.type, lambda text, default: self._prompt_string(text, default, is_sensitive=variable.sensitive))

  def _show_validation_error(self, message: str) -> None:
    """Display validation feedback consistently."""
    self.display.display_validation_error(message)

  def _prompt_string(self, prompt_text: str, default: Any = None, is_sensitive: bool = False) -> str:
    value = Prompt.ask(
      prompt_text,
      default=str(default) if default is not None else "",
      show_default=True,
      password=is_sensitive
    )
    if value is None:
      return None
    stripped = value.strip()
    return stripped if stripped != "" else None

  def _prompt_bool(self, prompt_text: str, default: Any = None) -> bool:
    default_bool = None
    if default is not None:
      default_bool = default if isinstance(default, bool) else str(default).lower() in ("true", "1", "yes", "on")
    return Confirm.ask(prompt_text, default=default_bool)

  def _prompt_int(self, prompt_text: str, default: Any = None) -> int:
    default_int = None
    if default is not None:
      try:
        default_int = int(default)
      except (ValueError, TypeError):
        logger.warning(f"Invalid default integer value: {default}")
    return IntPrompt.ask(prompt_text, default=default_int)

  def _prompt_enum(self, prompt_text: str, options: list[str], default: Any = None, extra: str | None = None) -> str:
    """Prompt for enum selection with validation.
    
    Note: prompt_text should already include hint from variable.get_validation_hint()
    but we keep this for backward compatibility and fallback.
    """
    if not options:
      return self._prompt_string(prompt_text, default)

    # Validate default is in options
    if default and str(default) not in options:
      default = options[0]

    while True:
      value = Prompt.ask(
        prompt_text,
        default=str(default) if default else options[0],
        show_default=True,
      )
      if value in options:
        return value
      self.console.print(f"[red]Invalid choice. Select from: {', '.join(options)}[/red]")

# !SECTION