"""Zsh history parser."""

import os
import re
from datetime import datetime
from typing import List, Optional

from .base import HistoryParser, ParsedCommand


class ZshHistoryParser(HistoryParser):
    """Parser for Zsh history files."""
    
    SHELL_NAME = "zsh"
    DEFAULT_HISTORY_FILE = os.path.expanduser("~/.zsh_history")
    
    ZSH_HISTORY_PATTERN = re.compile(
        r'^: (\d+):(\d+);(.*)$',
        re.MULTILINE
    )
    
    def parse_file(self, filepath: str) -> List[ParsedCommand]:
        """Parse a zsh history file."""
        try:
            with open(filepath, 'r', encoding='utf-8', errors='replace') as f:
                content = f.read()
            return self.parse_content(content)
        except FileNotFoundError:
            return []
        except Exception:
            return []
    
    def parse_content(self, content: str) -> List[ParsedCommand]:
        """Parse zsh history content from a string."""
        commands = []
        matches = self.ZSH_HISTORY_PATTERN.findall(content)
        
        for line_num, match in enumerate(matches, start=1):
            timestamp_str, _ , command = match
            try:
                timestamp = datetime.fromtimestamp(int(timestamp_str))
            except (ValueError, OSError):
                timestamp = None
            
            cmd = ParsedCommand(
                raw_command=command,
                timestamp=timestamp,
                line_number=line_num
            )
            commands.append(cmd)
        
        return commands