"""
Main entry point for Claude Vision Auto
"""

import sys
import os
import time
import select
import pty
import tty
import termios
import signal
import subprocess
from pathlib import Path

from . import config
from .screenshot import take_screenshot, cleanup_old_screenshots
from .vision_analyzer import VisionAnalyzer


def run_claude_with_vision(args: list = None):
    """
    Run Claude Code with vision-based auto-approval

    Args:
        args: Command line arguments to pass to claude
    """
    args = args or []

    # Initialize vision analyzer
    analyzer = VisionAnalyzer()

    # Test connection
    print("[Claude Vision Auto] Testing Ollama connection...")
    if not analyzer.test_connection():
        print("[ERROR] Cannot connect to Ollama or model not available")
        print(f"Make sure Ollama is running and '{config.VISION_MODEL}' is installed")
        sys.exit(1)

    print(f"[Claude Vision Auto] Connected to Ollama")
    print(f"[Claude Vision Auto] Using model: {config.VISION_MODEL}")
    print(f"[Claude Vision Auto] Idle threshold: {config.IDLE_THRESHOLD}s")
    print()

    # Build command
    cmd = ['claude'] + args

    # Check if claude exists
    if not subprocess.run(['which', 'claude'], capture_output=True).returncode == 0:
        print("[ERROR] 'claude' command not found")
        print("Make sure Claude Code CLI is installed")
        sys.exit(1)

    # Cleanup old screenshots
    cleanup_old_screenshots()

    # Save original terminal settings
    old_tty = termios.tcgetattr(sys.stdin)

    try:
        # Create pseudo-terminal
        master_fd, slave_fd = pty.openpty()

        # Fork process
        pid = os.fork()

        if pid == 0:
            # Child process - run claude
            os.close(master_fd)

            # Set up slave as stdin/stdout/stderr
            os.dup2(slave_fd, 0)
            os.dup2(slave_fd, 1)
            os.dup2(slave_fd, 2)

            if slave_fd > 2:
                os.close(slave_fd)

            # Execute claude
            os.execvp('claude', cmd)
        else:
            # Parent process - handle I/O and vision analysis
            os.close(slave_fd)

            # Set terminal to raw mode
            tty.setraw(sys.stdin.fileno())

            last_output_time = time.time()
            output_buffer = bytearray()

            try:
                while True:
                    # Check for data from claude or user
                    readable, _, _ = select.select(
                        [master_fd, sys.stdin.fileno()],
                        [],
                        [],
                        0.1
                    )

                    for fd in readable:
                        if fd == master_fd:
                            # Read from claude process
                            try:
                                data = os.read(master_fd, 1024)
                                if not data:
                                    # Process ended
                                    os.waitpid(pid, 0)
                                    return

                                # Write to stdout
                                os.write(sys.stdout.fileno(), data)

                                # Add to buffer for pattern matching
                                output_buffer.extend(data)
                                last_output_time = time.time()

                                # Keep buffer reasonable size
                                if len(output_buffer) > config.OUTPUT_BUFFER_SIZE:
                                    output_buffer = output_buffer[-config.OUTPUT_BUFFER_SIZE:]

                            except OSError:
                                # Process ended
                                os.waitpid(pid, 0)
                                return

                        elif fd == sys.stdin.fileno():
                            # Read from user input
                            data = os.read(sys.stdin.fileno(), 1024)
                            if data:
                                # Forward to claude
                                os.write(master_fd, data)

                    # Check if idle (no output for threshold seconds)
                    idle_time = time.time() - last_output_time

                    if idle_time >= config.IDLE_THRESHOLD:
                        # Check if buffer suggests we're waiting for input
                        buffer_str = output_buffer.decode('utf-8', errors='ignore')

                        # Look for approval keywords
                        has_keywords = any(
                            keyword in buffer_str
                            for keyword in config.APPROVAL_KEYWORDS
                        )

                        if has_keywords:
                            if config.DEBUG:
                                sys.stderr.write("\n[DEBUG] Approval keywords detected in buffer\n")
                                sys.stderr.flush()

                            sys.stderr.write("\n[Vision] Analyzing prompt...\n")
                            sys.stderr.flush()

                            # Take screenshot
                            screenshot_path = take_screenshot()

                            if screenshot_path:
                                # Analyze with vision
                                response = analyzer.analyze_screenshot(screenshot_path)

                                if response:
                                    sys.stderr.write(f"[Vision] Response: {response}\n")
                                    sys.stderr.flush()

                                    if response and response.upper() != "WAIT":
                                        # Send response
                                        time.sleep(config.RESPONSE_DELAY)
                                        os.write(master_fd, f"{response}\n".encode('utf-8'))

                                        # Clear buffer
                                        output_buffer.clear()
                                        last_output_time = time.time()

                                        sys.stderr.write("[Vision] Response sent\n")
                                        sys.stderr.flush()
                                    else:
                                        sys.stderr.write("[Vision] No action needed (WAIT)\n")
                                        sys.stderr.flush()
                                else:
                                    sys.stderr.write("[Vision] Analysis failed, waiting for manual input\n")
                                    sys.stderr.flush()

                                # Clean up screenshot
                                try:
                                    Path(screenshot_path).unlink()
                                except Exception:
                                    pass
                            else:
                                sys.stderr.write("[Vision] Screenshot failed, waiting for manual input\n")
                                sys.stderr.flush()

                        # Reset idle detection
                        last_output_time = time.time()

            except KeyboardInterrupt:
                # Kill child process
                os.kill(pid, signal.SIGTERM)
                os.waitpid(pid, 0)

    finally:
        # Restore terminal settings
        termios.tcsetattr(sys.stdin, termios.TCSADRAIN, old_tty)

        # Close master fd if still open
        try:
            os.close(master_fd)
        except:
            pass


def main():
    """CLI entry point"""
    args = sys.argv[1:]
    run_claude_with_vision(args)


if __name__ == '__main__':
    main()