agent.py

"""
Agent Session Logic
===================

Core agent interaction functions for running autonomous coding sessions.
"""

import asyncio
import io
import re
import sys
from datetime import datetime, timedelta
from pathlib import Path
from typing import Optional
from zoneinfo import ZoneInfo

from claude_agent_sdk import ClaudeSDKClient

# Fix Windows console encoding for Unicode characters (emoji, etc.)
# Without this, print() crashes when Claude outputs emoji like ✅
if sys.platform == "win32":
    sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding="utf-8", errors="replace")
    sys.stderr = io.TextIOWrapper(sys.stderr.buffer, encoding="utf-8", errors="replace")

from client import create_client
from progress import has_features, print_progress_summary, print_session_header
from prompts import (
    copy_spec_to_project,
    detect_framework_from_spec,
    get_coding_prompt,
    get_coding_prompt_yolo,
    get_initializer_prompt,
)

# Configuration
AUTO_CONTINUE_DELAY_SECONDS = 3


async def run_agent_session(
    client: ClaudeSDKClient,
    message: str,
    project_dir: Path,
) -> tuple[str, str]:
    """
    Run a single agent session using Claude Agent SDK.

    Args:
        client: Claude SDK client
        message: The prompt to send
        project_dir: Project directory path

    Returns:
        (status, response_text) where status is:
        - "continue" if agent should continue working
        - "error" if an error occurred
    """
    print("Sending prompt to Claude Agent SDK...\n")

    try:
        # Send the query
        await client.query(message)

        # Collect response text and show tool use
        response_text = ""
        async for msg in client.receive_response():
            msg_type = type(msg).__name__

            # Handle AssistantMessage (text and tool use)
            if msg_type == "AssistantMessage" and hasattr(msg, "content"):
                for block in msg.content:
                    block_type = type(block).__name__

                    if block_type == "TextBlock" and hasattr(block, "text"):
                        response_text += block.text
                        print(block.text, end="", flush=True)
                    elif block_type == "ToolUseBlock" and hasattr(block, "name"):
                        print(f"\n[Tool: {block.name}]", flush=True)
                        if hasattr(block, "input"):
                            input_str = str(block.input)
                            if len(input_str) > 200:
                                print(f"   Input: {input_str[:200]}...", flush=True)
                            else:
                                print(f"   Input: {input_str}", flush=True)

            # Handle UserMessage (tool results)
            elif msg_type == "UserMessage" and hasattr(msg, "content"):
                for block in msg.content:
                    block_type = type(block).__name__

                    if block_type == "ToolResultBlock":
                        result_content = getattr(block, "content", "")
                        is_error = getattr(block, "is_error", False)

                        # Check if command was blocked by security hook
                        if "blocked" in str(result_content).lower():
                            print(f"   [BLOCKED] {result_content}", flush=True)
                        elif is_error:
                            # Show errors (truncated)
                            error_str = str(result_content)[:500]
                            print(f"   [Error] {error_str}", flush=True)
                        else:
                            # Tool succeeded - just show brief confirmation
                            print("   [Done]", flush=True)

        print("\n" + "-" * 70 + "\n")
        return "continue", response_text

    except Exception as e:
        print(f"Error during agent session: {e}")
        return "error", str(e)


async def run_autonomous_agent(
    project_dir: Path,
    model: str,
    max_iterations: Optional[int] = None,
    yolo_mode: bool = False,
) -> None:
    """
    Run the autonomous agent loop.

    Args:
        project_dir: Directory for the project
        model: Claude model to use
        max_iterations: Maximum number of iterations (None for unlimited)
        yolo_mode: If True, skip browser testing and use YOLO prompt
    """
    print("\n" + "=" * 70)
    print("  AUTONOMOUS CODING AGENT DEMO")
    print("=" * 70)
    print(f"\nProject directory: {project_dir}")
    print(f"Model: {model}")
    if yolo_mode:
        print("Mode: YOLO (testing disabled)")
    else:
        print("Mode: Standard (full testing)")
    if max_iterations:
        print(f"Max iterations: {max_iterations}")
    else:
        print("Max iterations: Unlimited (will run until completion)")

    # Detect framework from spec
    framework = detect_framework_from_spec(project_dir)
    is_laravel = framework == "laravel"
    if is_laravel:
        print("Framework: Laravel (with Laravel Boost MCP)")
    else:
        print("Framework: Node.js")
    print()

    # Create project directory
    project_dir.mkdir(parents=True, exist_ok=True)

    # Check if this is a fresh start or continuation
    # Uses has_features() which checks if the database actually has features,
    # not just if the file exists (empty db should still trigger initializer)
    is_first_run = not has_features(project_dir)

    if is_first_run:
        print("Fresh start - will use initializer agent")
        print()
        print("=" * 70)
        print("  NOTE: First session takes 10-20+ minutes!")
        print("  The agent is generating 200 detailed test cases.")
        print("  This may appear to hang - it's working. Watch for [Tool: ...] output.")
        print("=" * 70)
        print()
        # Copy the app spec into the project directory for the agent to read
        copy_spec_to_project(project_dir)
    else:
        print("Continuing existing project")
        print_progress_summary(project_dir)

    # Main loop
    iteration = 0

    while True:
        iteration += 1

        # Check max iterations
        if max_iterations and iteration > max_iterations:
            print(f"\nReached max iterations ({max_iterations})")
            print("To continue, run the script again without --max-iterations")
            break

        # Print session header
        print_session_header(iteration, is_first_run)

        # Create client (fresh context)
        client = create_client(project_dir, model, yolo_mode=yolo_mode, is_laravel=is_laravel)

        # Choose prompt based on session type
        # Pass project_dir to enable project-specific prompts
        if is_first_run:
            prompt = get_initializer_prompt(project_dir)
            is_first_run = False  # Only use initializer once
        else:
            # Use YOLO prompt if in YOLO mode
            if yolo_mode:
                prompt = get_coding_prompt_yolo(project_dir)
            else:
                prompt = get_coding_prompt(project_dir)

        # Run session with async context manager
        async with client:
            status, response = await run_agent_session(client, prompt, project_dir)

        # Handle status
        if status == "continue":
            delay_seconds = AUTO_CONTINUE_DELAY_SECONDS
            target_time_str = None

            if "limit reached" in response.lower():
                print("Claude Agent SDK indicated limit reached.")

                # Try to parse reset time from response
                match = re.search(
                    r"(?i)\bresets(?:\s+at)?\s+(\d+)(?::(\d+))?\s*(am|pm)\s*\(([^)]+)\)",
                    response,
                )
                if match:
                    hour = int(match.group(1))
                    minute = int(match.group(2)) if match.group(2) else 0
                    period = match.group(3).lower()
                    tz_name = match.group(4).strip()

                    # Convert to 24-hour format
                    if period == "pm" and hour != 12:
                        hour += 12
                    elif period == "am" and hour == 12:
                        hour = 0

                    try:
                        tz = ZoneInfo(tz_name)
                        now = datetime.now(tz)
                        target = now.replace(
                            hour=hour, minute=minute, second=0, microsecond=0
                        )

                        # If target time has already passed today, wait until tomorrow
                        if target <= now:
                            target += timedelta(days=1)

                        delta = target - now
                        delay_seconds = min(
                            delta.total_seconds(), 24 * 60 * 60
                        )  # Clamp to 24 hours max
                        target_time_str = target.strftime("%B %d, %Y at %I:%M %p %Z")

                    except Exception as e:
                        print(f"Error parsing reset time: {e}, using default delay")

            if target_time_str:
                print(
                    f"\nClaude Code Limit Reached. Agent will auto-continue in {delay_seconds:.0f}s ({target_time_str})...",
                    flush=True,
                )
            else:
                print(
                    f"\nAgent will auto-continue in {delay_seconds:.0f}s...", flush=True
                )

            sys.stdout.flush()  # this should allow the pause to be displayed before sleeping
            print_progress_summary(project_dir)
            await asyncio.sleep(delay_seconds)

        elif status == "error":
            print("\nSession encountered an error")
            print("Will retry with a fresh session...")
            await asyncio.sleep(AUTO_CONTINUE_DELAY_SECONDS)

        # Small delay between sessions
        if max_iterations is None or iteration < max_iterations:
            print("\nPreparing next session...\n")
            await asyncio.sleep(1)

    # Final summary
    print("\n" + "=" * 70)
    print("  SESSION COMPLETE")
    print("=" * 70)
    print(f"\nProject directory: {project_dir}")
    print_progress_summary(project_dir)

    # Print instructions for running the generated application
    print("\n" + "-" * 70)
    print("  TO RUN THE GENERATED APPLICATION:")
    print("-" * 70)
    print(f"\n  cd {project_dir.resolve()}")
    print("  ./init.sh           # Run the setup script")
    print("  # Or manually:")
    print("  npm install && npm run dev")
    print("\n  Then open http://localhost:3000 (or check init.sh for the URL)")
    print("-" * 70)

    print("\nDone!")