"""
Terminal User Interface (TUI) for progress display.
"""

import shutil
from typing import Optional


class ProgressDisplay:
    """Beautiful, terminal-aware progress display."""

    def __init__(self):
        """Initialize progress display."""
        self.terminal_width = shutil.get_terminal_size((80, 20)).columns
        self.current_step = ""
        self.current_substep = ""

    def clear_line(self) -> None:
        """Clear the current line."""
        print('\r' + ' ' * self.terminal_width + '\r', end='', flush=True)

    def update_width(self) -> None:
        """Update terminal width (call if terminal is resized)."""
        self.terminal_width = shutil.get_terminal_size((80, 20)).columns

    def print_header(self, text: str) -> None:
        """Print a formatted header."""
        self.update_width()
        print()
        print("=" * self.terminal_width)
        centered = self._center_text(text)
        print(centered)
        print("=" * self.terminal_width)
        print()

    def print_section(self, text: str) -> None:
        """Print a formatted section."""
        self.update_width()
        print()
        print(f"▶ {text}")
        print()

    def print_info(self, text: str, indent: int = 0) -> None:
        """Print an info line."""
        prefix = "  " * indent
        print(f"{prefix}ℹ {text}")

    def print_success(self, text: str, indent: int = 0) -> None:
        """Print a success message."""
        prefix = "  " * indent
        print(f"{prefix}✓ {text}")

    def print_warning(self, text: str, indent: int = 0) -> None:
        """Print a warning message."""
        prefix = "  " * indent
        print(f"{prefix}⚠ {text}")

    def print_error(self, text: str, indent: int = 0) -> None:
        """Print an error message."""
        prefix = "  " * indent
        print(f"{prefix}✗ {text}")

    def print_progress_bar(self, current: int, total: int, label: str = "",
                          bar_width: Optional[int] = None) -> None:
        """
        Print a progress bar that adapts to terminal width.

        Args:
            current: Current progress value
            total: Total value
            label: Optional label for the progress
            bar_width: Optional custom bar width (defaults to terminal width - 30)
        """
        self.update_width()
        if bar_width is None:
            bar_width = max(10, self.terminal_width - 40)

        if total == 0:
            percentage = 0
            filled = 0
        else:
            percentage = (current / total) * 100
            filled = int((current / total) * bar_width)

        bar = "█" * filled + "░" * (bar_width - filled)
        status = f"{current:>{len(str(total))}}/{total}"

        if label:
            output = f"  {label:<20} │{bar}│ {status} ({percentage:5.1f}%)"
        else:
            output = f"  │{bar}│ {status} ({percentage:5.1f}%)"

        # Truncate if too long
        if len(output) > self.terminal_width - 2:
            output = output[:self.terminal_width - 5] + "..."

        print(output)

    def print_stats(self, stats: dict) -> None:
        """
        Print formatted statistics.

        Args:
            stats: Dictionary of stat_name -> stat_value
        """
        self.update_width()
        print()
        for key, value in stats.items():
            # Format the key-value pair
            line = f"  {key}: {value}"
            print(line)
        print()

    def _center_text(self, text: str) -> str:
        """Center text within terminal width."""
        available_width = self.terminal_width - 2  # Account for padding
        if len(text) >= available_width:
            return text[:available_width]

        left_pad = (available_width - len(text)) // 2
        right_pad = available_width - len(text) - left_pad
        return " " * left_pad + text + " " * right_pad

    def print_banner(self, text: str) -> None:
        """Print a decorative banner."""
        self.update_width()
        print()
        print("╔" + "═" * (self.terminal_width - 2) + "╗")
        print("║" + self._center_text(text) + "║")
        print("╚" + "═" * (self.terminal_width - 2) + "╝")
        print()

    def print_step(self, step_number: int, total_steps: int, description: str) -> None:
        """
        Print a numbered step.

        Args:
            step_number: Current step number
            total_steps: Total number of steps
            description: Description of the step
        """
        print(f"\n[{step_number}/{total_steps}] {description}")

    def print_file_info(self, filename: str, total_minutes: int, total_hours: float,
                        chunk_count: int) -> None:
        """Print file information."""
        self.update_width()
        print()
        print(f"  📄 File: {filename}")
        print(f"  ⏱  Duration: {total_minutes} minutes ({total_hours:.2f} hours)")
        print(f"  📦 Chunks: {chunk_count} (estimated based on 32k token limit)")
        print()

    def print_chunk_status(self, chunk_id: int, total_chunks: int,
                          status: str, details: str = "") -> None:
        """
        Print status of a single chunk.

        Args:
            chunk_id: Chunk identifier (1-indexed)
            total_chunks: Total number of chunks
            status: Status emoji/icon
            details: Additional details
        """
        detail_str = f" - {details}" if details else ""
        print(f"  Chunk {chunk_id:>3}/{total_chunks}: {status}{detail_str}")