from utils import format_time_short

HELP_TEXT = """
<b>Available Commands:</b><br>
• <b>/play</b>, <b>/pause</b> - Control playback<br>
• <b>/seek [time]</b> - Seek (e.g., 1:23, +30s, -1m)<br>
• <b>/tag [now|time] [name]</b> - Create a highlight<br>
• <b>/time</b> - Show current timestamp<br>
• <b>/help</b> - Show this message<br><br>
<b>Keyboard Shortcuts:</b><br>
• <b>Space</b>: Play/Pause<br>
• <b>F</b>: Fullscreen | <b>M</b>: Mute<br>
• <b>Left/Right</b>: Seek ±5s<br>
• <b>Up/Down</b>: Volume ±5%<br>
• <b>Enter</b>: Focus chat | <b>Esc</b>: Clear focus
"""


def parse_time_arg(arg: str, current_ms: int, length_ms: int):
    """Parses a time string (absolute time, offset like +30s, or 'now') and returns the target time in MS. Returns None on error."""
    if arg == "now":
        return current_ms

    try:
        target_ms = 0
        if arg.startswith('+') or arg.startswith('-'):
            modifier = 1 if arg.startswith('+') else -1
            num_str = arg[1:]
            if num_str.endswith('s'): val = float(num_str[:-1]) * 1000
            elif num_str.endswith('m'): val = float(num_str[:-1]) * 60 * 1000
            elif num_str.endswith('h'): val = float(num_str[:-1]) * 3600 * 1000
            else: val = float(num_str) * 1000
            target_ms = current_ms + (val * modifier)
        elif ":" in arg:
            parts = arg.split(":")
            parts.reverse()
            if len(parts) > 0: target_ms += float(parts[0]) * 1000
            if len(parts) > 1: target_ms += float(parts[1]) * 60 * 1000
            if len(parts) > 2: target_ms += float(parts[2]) * 3600 * 1000
        else:
            if arg.endswith('s'): target_ms = float(arg[:-1]) * 1000
            elif arg.endswith('m'): target_ms = float(arg[:-1]) * 60 * 1000
            elif arg.endswith('h'): target_ms = float(arg[:-1]) * 3600 * 1000
            else: target_ms = float(arg) * 1000
            
        if length_ms > 0:
            return max(0, min(target_ms, length_ms))
        return max(0, target_ms)
    except ValueError:
        return None


def handle_chat_command(cmd: str, parts: list, widget):
    """Handle a slash command. Returns True if the command was handled."""
    if cmd == "/play":
        if not widget.vlc_player.is_playing:
            widget.toggle_playback()
        widget.add_system_message(" ".join(parts))
        return True
        
    elif cmd == "/pause":
        if widget.vlc_player.is_playing:
            widget.toggle_playback()
        widget.add_system_message(" ".join(parts))
        return True
        
    elif cmd == "/seek":
        if len(parts) > 1:
            if widget._handle_seek_command(parts[1]):
                widget.add_system_message(" ".join(parts))
            else:
                widget.add_system_message("Invalid time format. Use: 1:23, +30s, -1m")
        else:
            widget.add_system_message("Usage: /seek [time]")
        return True
        
    elif cmd == "/tag":
        if len(parts) > 1:
            time_arg = parts[1].lower()
            tag_name = " ".join(parts[2:])
            
            current_ms = widget.vlc_player.current_time_ms
            length_ms = widget.vlc_player.get_length()
            target_ms = parse_time_arg(time_arg, current_ms, length_ms)
            
            if target_ms is not None:
                time_str = format_time_short(target_ms)
                msg = f"{time_str} {tag_name}".strip()
                widget.chat_message_ready.emit(msg)
            else:
                widget.add_system_message("Invalid time format. Use: now, 1:23, +30s, -1m")
        else:
            widget.add_system_message("Usage: /tag [now|time] [name]")
        return True
        
    elif cmd == "/time":
        current_ms = widget.vlc_player.current_time_ms
        time_str = format_time_short(current_ms)
        widget.add_system_message(f"Current time: <a href='seek:{time_str}' style='color: #66b3ff; text-decoration: none;'>{time_str}</a>")
        return True
        
    elif cmd == "/help":
        widget.add_system_message(HELP_TEXT)
        return True
    
    return False