"""
Markdown formatting utilities for terminal display.
"""
import re
import io
import sys
from termcolor import colored
from rich.console import Console
from rich.markdown import Markdown
from rich.syntax import Syntax
from rich.panel import Panel

def convert_markdown_to_terminal(text):
    """
    Convert markdown formatting to terminal-friendly colored text.
    
    Args:
        text (str): Markdown text to convert
        
    Returns:
        str: Terminal-formatted text with ANSI color codes
    """
    if not text:
        return text
    
    # Handle code blocks with triple backticks
    text = re.sub(
        r'```(?:\w+)?\n(.*?)\n```',
        lambda m: '\n' + colored(m.group(1), 'white', attrs=['bold', 'dark']) + '\n',
        text, 
        flags=re.DOTALL
    )
    
    # Handle inline code with single backticks
    text = re.sub(
        r'`([^`]+)`', 
        lambda m: colored(m.group(1), 'white', attrs=['bold']), 
        text
    )
    
    # Handle bold text with ** or __
    text = re.sub(
        r'\*\*([^*]+)\*\*|__([^_]+)__', 
        lambda m: colored(m.group(1) or m.group(2), attrs=['bold']), 
        text
    )
    
    # Handle italic text with * or _
    text = re.sub(
        r'\*([^*]+)\*|_([^_]+)_', 
        lambda m: colored(m.group(1) or m.group(2), attrs=['underline']), 
        text
    )
    
    # Handle headers
    text = re.sub(
        r'^#{1,6}\s+(.+)$', 
        lambda m: colored(m.group(1), 'cyan', attrs=['bold']), 
        text,
        flags=re.MULTILINE
    )
    
    # Handle unordered lists
    text = re.sub(
        r'^(\s*[-*•]\s+)(.+)$', 
        lambda m: m.group(1) + colored(m.group(2), 'white'), 
        text,
        flags=re.MULTILINE
    )
    
    # Handle ordered lists
    text = re.sub(
        r'^(\s*\d+\.\s+)(.+)$', 
        lambda m: m.group(1) + colored(m.group(2), 'white'), 
        text,
        flags=re.MULTILINE
    )
    
    # Handle links [text](url) - keep only the text part
    text = re.sub(
        r'\[([^\]]+)\]\([^)]+\)', 
        lambda m: colored(m.group(1), 'blue', attrs=['underline']), 
        text
    )
    
    # Handle horizontal rules
    text = re.sub(
        r'^-{3,}$|^\*{3,}$|^_{3,}$', 
        lambda m: colored('-' * 50, 'white', attrs=['dark']), 
        text,
        flags=re.MULTILINE
    )
    
    # Handle blockquotes
    text = re.sub(
        r'^>\s+(.+)$', 
        lambda m: colored('│ ', 'cyan') + colored(m.group(1), 'cyan'), 
        text,
        flags=re.MULTILINE
    )
    
    return text

def format_command_explanation(explanation, use_rich=False):
    """
    Format a command explanation with appropriate terminal styling.
    
    Args:
        explanation (str): The explanation text in markdown format
        use_rich (bool): Whether to use rich formatting
        
    Returns:
        str: Formatted explanation with terminal-friendly styling
    """
    if use_rich:
        return format_command_explanation_rich(explanation)
    
    # First convert markdown to terminal format
    formatted_text = convert_markdown_to_terminal(explanation)
    
    # Add additional formatting for common command explanation patterns
    
    # Highlight command parts and common technical terms
    formatted_text = re.sub(
        r'\b(command|option|flag|argument|parameter|switch)\b',
        lambda m: colored(m.group(0), 'yellow'),
        formatted_text, 
        flags=re.IGNORECASE
    )
    
    # Highlight file paths and patterns
    # More specific pattern to avoid matching things like "Unix/Linux"
    formatted_text = re.sub(
        r'(?:^|\s)(/(?:[\w.-]+/?)+)(?=\s|$|[,.;:])',  # Path must start with / and have at least one directory component
        lambda m: colored(m.group(1), 'green'),
        formatted_text
    )
    
    # Highlight command names and utilities
    # Common Unix/Linux commands
    formatted_text = re.sub(
        r'\b(ls|grep|find|awk|sed|cat|cp|mv|rm|mkdir|chmod|chown|ps|kill|top|df|du|tar|gzip|ssh|scp|curl|wget)\b',
        lambda m: colored(m.group(0), 'green'),
        formatted_text
    )
    
    # Highlight "This command" starts of sentences
    formatted_text = re.sub(
        r'(^|[.!?]\s+)(This command|The command)',
        lambda m: m.group(1) + colored(m.group(2), 'cyan', attrs=['bold']),
        formatted_text
    )
    
    return formatted_text

def format_command_explanation_rich(explanation):
    """
    Format a command explanation with rich formatting.
    
    Args:
        explanation (str): The explanation text in markdown format
        
    Returns:
        str: Rich-formatted explanation as a string
    """
    # Capture the rich output as a string
    str_io = io.StringIO()
    console = Console(file=str_io, width=80)
    
    # Create a markdown object
    md = Markdown(explanation)
    
    # Render in a panel with a title
    panel = Panel(md, title="Command Explanation", border_style="green")
    console.print(panel)
    
    return str_io.getvalue()

def format_command_rich(command, shell="bash", theme="monokai"):
    """
    Format a command with syntax highlighting using Rich.
    
    Args:
        command (str): The command to format
        shell (str): The shell language for syntax highlighting
        theme (str): The color theme to use
        
    Returns:
        str: Rich-formatted command as a string
    """
    # Capture the rich output as a string
    str_io = io.StringIO()
    console = Console(file=str_io, width=80)
    
    # Create a syntax object
    syntax = Syntax(command, shell, theme=theme, word_wrap=True)
    
    # Render in a panel with a title
    panel = Panel(syntax, title="Command", border_style="blue")
    console.print(panel)
    
    return str_io.getvalue()

def print_command_rich(command, shell="bash", theme="monokai"):
    """
    Print a command with syntax highlighting using Rich.
    
    Args:
        command (str): The command to print
        shell (str): The shell language for syntax highlighting
        theme (str): The color theme to use
    """
    console = Console()
    syntax = Syntax(command, shell, theme=theme, word_wrap=True)
    panel = Panel(syntax, title="Command", border_style="blue")
    console.print(panel)