claude_converter.py

import json
import uuid
import time
import logging
from datetime import datetime
from typing import List, Dict, Any, Optional, Union

try:
    from .claude_types import ClaudeRequest, ClaudeMessage, ClaudeTool
except ImportError:
    # Fallback for dynamic loading where relative import might fail
    # We assume claude_types is available in sys.modules or we can import it directly if in same dir
    import sys
    if "v2.claude_types" in sys.modules:
        from v2.claude_types import ClaudeRequest, ClaudeMessage, ClaudeTool
    else:
        # Try absolute import assuming v2 is in path or current dir
        try:
            from claude_types import ClaudeRequest, ClaudeMessage, ClaudeTool
        except ImportError:
             # Last resort: if loaded via importlib in app.py, we might need to rely on app.py injecting it
             # But app.py loads this module.
             pass

logger = logging.getLogger(__name__)

THINKING_HINT = "<antml:thinking_mode>interleaved</antml:thinking_mode><antml:max_thinking_length>16000</antml:max_thinking_length>"
THINKING_START_TAG = "<thinking>"
THINKING_END_TAG = "</thinking>"

def _wrap_thinking_content(thinking_text: str) -> str:
    """Wrap thinking text with the XML tag expected by Amazon Q."""
    return f"{THINKING_START_TAG}{thinking_text}{THINKING_END_TAG}"

def is_thinking_mode_enabled(thinking_cfg: Optional[Any]) -> bool:
    """Detect whether the client enabled thinking mode."""
    if thinking_cfg is None:
        return False
    if isinstance(thinking_cfg, bool):
        return thinking_cfg
    if isinstance(thinking_cfg, str):
        return thinking_cfg.lower() == "enabled"
    if isinstance(thinking_cfg, dict):
        type_val = str(thinking_cfg.get("type", "")).lower()
        if type_val == "enabled":
            return True
        enabled_flag = thinking_cfg.get("enabled")
        if isinstance(enabled_flag, bool):
            return enabled_flag
        budget = thinking_cfg.get("budget_tokens")
        if isinstance(budget, (int, float)) and budget > 0:
            return True
    return False

def _append_thinking_hint(text: str, hint: str = THINKING_HINT) -> str:
    """Append the special hint once to the end of the text."""
    text = text or ""
    normalized = text.rstrip()
    if normalized.endswith(hint):
        return text
    if not text:
        return hint
    separator = "" if text.endswith(("\n", "\r")) else "\n"
    return f"{text}{separator}{hint}"

def get_current_timestamp() -> str:
    """Get current timestamp in Amazon Q format."""
    now = datetime.now().astimezone()
    weekday = now.strftime("%A")
    iso_time = now.isoformat(timespec='milliseconds')
    return f"{weekday}, {iso_time}"

def _process_tool_result_block(block: Dict[str, Any]) -> Dict[str, Any]:
    """Convert Claude tool_result block to Amazon Q format."""
    tool_use_id = block.get("tool_use_id")
    raw_c = block.get("content", [])

    aq_content = []
    if isinstance(raw_c, str):
        aq_content = [{"text": raw_c}]
    elif isinstance(raw_c, list):
        for item in raw_c:
            if isinstance(item, dict):
                if item.get("type") == "text":
                    aq_content.append({"text": item.get("text", "")})
                elif "text" in item:
                    aq_content.append({"text": item["text"]})
            elif isinstance(item, str):
                aq_content.append({"text": item})

    # Handle empty content
    if not any(i.get("text", "").strip() for i in aq_content):
        if block.get("status") != "error" and not block.get("is_error"):
            aq_content = [{"text": "Command executed successfully"}]
        else:
            aq_content = [{"text": "Tool use was cancelled by the user"}]

    # Determine status from both 'status' field and 'is_error' flag
    status = block.get("status")
    if not status:
        status = "error" if block.get("is_error") else "success"

    return {
        "toolUseId": tool_use_id,
        "content": aq_content,
        "status": status
    }

def map_model_name(claude_model: str) -> str:
    """Map Claude model name to Amazon Q model ID.

    Accepts both short names (e.g., claude-sonnet-4) and canonical names
    (e.g., claude-sonnet-4-20250514).
    """
    DEFAULT_MODEL = "claude-sonnet-4.5"

    # Available models in the service (with KIRO_CLI origin)
    VALID_MODELS = {"auto", "claude-sonnet-4", "claude-sonnet-4.5", "claude-haiku-4.5", "claude-opus-4.5"}

    # Mapping from canonical names to short names
    CANONICAL_TO_SHORT = {
        "claude-sonnet-4-20250514": "claude-sonnet-4",
        "claude-sonnet-4-5-20250929": "claude-sonnet-4.5",
        "claude-haiku-4-5-20251001": "claude-haiku-4.5",
        # Amazon Q supports Opus with KIRO_CLI origin
        "claude-opus-4-5-20251101": "claude-opus-4.5",
        # Legacy Claude 3.5 Sonnet models
        "claude-3-5-sonnet-20241022": "claude-sonnet-4.5",
        "claude-3-5-sonnet-20240620": "claude-sonnet-4.5",
    }

    model_lower = claude_model.lower()

    # Check if it's a valid short name (but not "auto" which Amazon Q doesn't accept)
    if model_lower in VALID_MODELS and model_lower != "auto":
        return model_lower

    # Check if it's a canonical name
    if model_lower in CANONICAL_TO_SHORT:
        return CANONICAL_TO_SHORT[model_lower]

    # Unknown model - log warning and return default
    logger.warning(f"Unknown model '{claude_model}', falling back to default model '{DEFAULT_MODEL}'")
    return DEFAULT_MODEL

def extract_text_from_content(content: Union[str, List[Dict[str, Any]]]) -> str:
    """Extract text from Claude content."""
    if isinstance(content, str):
        return content
    elif isinstance(content, list):
        parts = []
        for block in content:
            if isinstance(block, dict):
                block_type = block.get("type")
                if block_type == "text":
                    parts.append(block.get("text", ""))
                elif block_type == "thinking":
                    parts.append(_wrap_thinking_content(block.get("thinking", "")))
        return "\n".join(parts)
    return ""

def extract_images_from_content(content: Union[str, List[Dict[str, Any]]]) -> Optional[List[Dict[str, Any]]]:
    """Extract images from Claude content and convert to Amazon Q format."""
    if not isinstance(content, list):
        return None
    
    images = []
    for block in content:
        if isinstance(block, dict) and block.get("type") == "image":
            source = block.get("source", {})
            if source.get("type") == "base64":
                media_type = source.get("media_type", "image/png")
                fmt = media_type.split("/")[-1] if "/" in media_type else "png"
                images.append({
                    "format": fmt,
                    "source": {
                        "bytes": source.get("data", "")
                    }
                })
    return images if images else None

def convert_tool(tool: ClaudeTool) -> Dict[str, Any]:
    """Convert Claude tool to Amazon Q tool."""
    desc = tool.description or ""
    if len(desc) > 10240:
        desc = desc[:10100] + "\n\n...(Full description provided in TOOL DOCUMENTATION section)"
    
    return {
        "toolSpecification": {
            "name": tool.name,
            "description": desc,
            "inputSchema": {"json": tool.input_schema}
        }
    }

def _merge_tool_result_into_dict(tool_results_by_id: Dict[str, Dict[str, Any]], tool_result: Dict[str, Any]) -> None:
    """
    Merge a tool_result into the deduplicated dict.
    If toolUseId already exists, merge the content arrays.

    Args:
        tool_results_by_id: Dict mapping toolUseId to tool_result
        tool_result: The tool_result to merge
    """
    tool_use_id = tool_result.get("toolUseId")
    if not tool_use_id:
        return

    if tool_use_id in tool_results_by_id:
        # Merge content arrays
        existing = tool_results_by_id[tool_use_id]
        existing_content = existing.get("content", [])
        new_content = tool_result.get("content", [])

        # Deduplicate content by text value
        existing_texts = {item.get("text", "") for item in existing_content if isinstance(item, dict)}
        for item in new_content:
            if isinstance(item, dict):
                text = item.get("text", "")
                if text and text not in existing_texts:
                    existing_content.append(item)
                    existing_texts.add(text)

        existing["content"] = existing_content

        # If any result has error status, keep error
        if tool_result.get("status") == "error":
            existing["status"] = "error"

        logger.debug(f"Merged duplicate toolUseId {tool_use_id}")
    else:
        # New toolUseId, add to dict
        tool_results_by_id[tool_use_id] = tool_result.copy()


def merge_user_messages(messages: List[Dict[str, Any]], hint: str = THINKING_HINT) -> Dict[str, Any]:
    """Merge consecutive user messages, keeping only the last 2 messages' images.

    IMPORTANT: This function properly merges toolResults from all messages to prevent
    losing tool execution history, which would cause infinite loops.

    Key fix: Deduplicate toolResults by toolUseId to prevent duplicate tool_result
    entries that cause the model to repeatedly respond to the same user message.

    When merging messages that contain thinking hints, removes duplicate hints and
    ensures only one hint appears at the end of the merged content.

    Args:
        messages: List of user messages to merge
        hint: The thinking hint string to deduplicate
    """
    if not messages:
        return {}

    all_contents = []
    base_context = None
    base_origin = None
    base_model = None
    all_images = []
    # Use dict to deduplicate toolResults by toolUseId
    tool_results_by_id: Dict[str, Dict[str, Any]] = {}

    for msg in messages:
        content = msg.get("content", "")
        msg_ctx = msg.get("userInputMessageContext", {})

        # Initialize base context from first message
        if base_context is None:
            base_context = msg_ctx.copy() if msg_ctx else {}
            # Remove toolResults from base to merge them separately
            if "toolResults" in base_context:
                for tr in base_context.pop("toolResults"):
                    _merge_tool_result_into_dict(tool_results_by_id, tr)
        else:
            # Collect toolResults from subsequent messages
            if "toolResults" in msg_ctx:
                for tr in msg_ctx["toolResults"]:
                    _merge_tool_result_into_dict(tool_results_by_id, tr)

        if base_origin is None:
            base_origin = msg.get("origin", "KIRO_CLI")
        if base_model is None:
            base_model = msg.get("modelId")

        # Remove thinking hint from individual message content to avoid duplication
        # The hint will be added once at the end of the merged content
        if content:
            content_cleaned = content.replace(hint, "").strip()
            if content_cleaned:
                all_contents.append(content_cleaned)

        # Collect images from each message
        msg_images = msg.get("images")
        if msg_images:
            all_images.append(msg_images)

    # Merge content and ensure thinking hint appears only once at the end
    merged_content = "\n\n".join(all_contents)
    # Check if any of the original messages had the hint (indicating thinking was enabled)
    had_thinking_hint = any(hint in msg.get("content", "") for msg in messages)
    if had_thinking_hint:
        merged_content = _append_thinking_hint(merged_content, hint)

    result = {
        "content": merged_content,
        "userInputMessageContext": base_context or {},
        "origin": base_origin or "KIRO_CLI",
        "modelId": base_model
    }

    # Add deduplicated toolResults if any
    if tool_results_by_id:
        result["userInputMessageContext"]["toolResults"] = list(tool_results_by_id.values())

    # Only keep images from the last 2 messages that have images
    if all_images:
        kept_images = []
        for img_list in all_images[-2:]:  # Take last 2 messages' images
            kept_images.extend(img_list)
        if kept_images:
            result["images"] = kept_images

    return result

def _reorder_tool_results_by_tool_uses(tool_results: List[Dict[str, Any]], tool_use_order: List[str]) -> List[Dict[str, Any]]:
    """Reorder tool_results to match the order of tool_uses from the preceding assistant message.

    This is critical for preventing model confusion when parallel tool calls return results
    in a different order than they were called.

    Args:
        tool_results: List of tool_result dicts with toolUseId
        tool_use_order: List of toolUseIds in the order they appeared in the assistant message

    Returns:
        Reordered list of tool_results
    """
    if not tool_use_order or not tool_results:
        return tool_results

    result_by_id = {r["toolUseId"]: r for r in tool_results}
    ordered_results = []

    # Add results in the order of tool_uses
    for tool_use_id in tool_use_order:
        if tool_use_id in result_by_id:
            ordered_results.append(result_by_id.pop(tool_use_id))

    # Add any remaining results not in the original order (shouldn't happen normally)
    ordered_results.extend(result_by_id.values())

    return ordered_results


def process_history(messages: List[ClaudeMessage], thinking_enabled: bool = False, hint: str = THINKING_HINT) -> List[Dict[str, Any]]:
    """Process history messages to match Amazon Q format (alternating user/assistant).

    Dual-mode detection:
    - If messages already alternate correctly (no consecutive user/assistant), skip merging
    - If messages have consecutive same-role messages, apply merge logic

    Key fix: Track tool_use order from assistant messages and reorder tool_results in user
    messages to match. This prevents model confusion when parallel tool calls return results
    in a different order than they were called.
    """
    history = []
    seen_tool_use_ids = set()  # Track tool_use IDs in assistant messages
    last_tool_use_order = []  # Track order of tool_uses from the last assistant message

    raw_history = []

    # First pass: convert individual messages
    for msg in messages:
        if msg.role == "user":
            content = msg.content
            text_content = ""
            tool_results = None
            images = extract_images_from_content(content)
            should_append_hint = thinking_enabled

            if isinstance(content, list):
                text_parts = []
                for block in content:
                    if isinstance(block, dict):
                        btype = block.get("type")
                        if btype == "text":
                            text_parts.append(block.get("text", ""))
                        elif btype == "thinking":
                            text_parts.append(_wrap_thinking_content(block.get("thinking", "")))
                        elif btype == "tool_result":
                            tool_use_id = block.get("tool_use_id")

                            if tool_results is None:
                                tool_results = []
                            result = _process_tool_result_block(block)
                            # Merge if exists within this message
                            existing = next((r for r in tool_results if r["toolUseId"] == result["toolUseId"]), None)
                            if existing:
                                existing["content"].extend(result["content"])
                                if result["status"] == "error":
                                    existing["status"] = "error"
                            else:
                                tool_results.append(result)
                text_content = "\n".join(text_parts)
            else:
                text_content = extract_text_from_content(content)

            if should_append_hint:
                text_content = _append_thinking_hint(text_content, hint)

            # Reorder tool_results to match the order of tool_uses from the preceding assistant message
            if tool_results and last_tool_use_order:
                tool_results = _reorder_tool_results_by_tool_uses(tool_results, last_tool_use_order)
                logger.info(f"Reordered {len(tool_results)} tool_results to match tool_uses order")

            user_ctx = {
                "envState": {
                    "operatingSystem": "macos",
                    "currentWorkingDirectory": "/"
                }
            }
            if tool_results:
                user_ctx["toolResults"] = tool_results
                
            u_msg = {
                "content": text_content,
                "userInputMessageContext": user_ctx,
                "origin": "KIRO_CLI"
            }
            if images:
                u_msg["images"] = images

            raw_history.append({"userInputMessage": u_msg})

        elif msg.role == "assistant":
            content = msg.content
            text_content = extract_text_from_content(content)

            entry = {
                "assistantResponseMessage": {
                    "messageId": str(uuid.uuid4()),
                    "content": text_content
                }
            }

            # Track tool_use order for reordering tool_results in the next user message
            last_tool_use_order = []
            if isinstance(content, list):
                tool_uses = []
                for block in content:
                    if isinstance(block, dict) and block.get("type") == "tool_use":
                        tid = block.get("id")
                        if tid and tid not in seen_tool_use_ids:
                            seen_tool_use_ids.add(tid)
                            last_tool_use_order.append(tid)  # Track order
                            tool_uses.append({
                                "toolUseId": tid,
                                "name": block.get("name"),
                                "input": block.get("input", {})
                            })
                if tool_uses:
                    entry["assistantResponseMessage"]["toolUses"] = tool_uses

            raw_history.append(entry)

    # Dual-mode detection: check if messages already alternate correctly
    has_consecutive_same_role = False
    prev_role = None
    for item in raw_history:
        current_role = "user" if "userInputMessage" in item else "assistant"
        if prev_role == current_role:
            has_consecutive_same_role = True
            break
        prev_role = current_role
    
    # If messages already alternate, skip merging (fast path)
    if not has_consecutive_same_role:
        logger.info("Messages already alternate correctly, skipping merge logic")
        return raw_history

    # Second pass: merge consecutive user messages (only if needed)
    logger.info("Detected consecutive same-role messages, applying merge logic")
    pending_user_msgs = []
    for item in raw_history:
        if "userInputMessage" in item:
            user_msg = item["userInputMessage"]
            has_tool_results = bool(
                user_msg.get("userInputMessageContext", {}).get("toolResults")
            )
            if has_tool_results:
                if pending_user_msgs:
                    merged = merge_user_messages(pending_user_msgs, hint)
                    history.append({"userInputMessage": merged})
                    pending_user_msgs = []
                history.append(item)
            else:
                pending_user_msgs.append(user_msg)
        elif "assistantResponseMessage" in item:
            if pending_user_msgs:
                merged = merge_user_messages(pending_user_msgs, hint)
                history.append({"userInputMessage": merged})
                pending_user_msgs = []
            history.append(item)
            
    if pending_user_msgs:
        merged = merge_user_messages(pending_user_msgs, hint)
        history.append({"userInputMessage": merged})
        
    return history

def _validate_history_alternation(history: List[Dict[str, Any]]) -> None:
    """Validate that history messages alternate correctly (user-assistant-user-assistant...).

    This prevents infinite loops caused by malformed message ordering where tool_result
    ends up above the user message, causing the model to keep executing the same instruction.

    Raises:
        ValueError: If messages don't alternate properly
    """
    if not history:
        return

    prev_role = None
    for idx, item in enumerate(history):
        if "userInputMessage" in item:
            current_role = "user"
        elif "assistantResponseMessage" in item:
            current_role = "assistant"
        else:
            continue

        if prev_role == current_role:
            raise ValueError(
                f"Message {idx} violates alternation rule: consecutive {current_role} messages. "
                f"This may indicate malformed message ordering that could cause infinite loops."
            )
        prev_role = current_role


def _detect_tool_call_loop(messages: List[ClaudeMessage], threshold: int = 3) -> Optional[str]:
    """Detect if the same tool is being called repeatedly (potential infinite loop).

    Only triggers if:
    1. Same tool called N times with same input
    2. All calls are in CONSECUTIVE assistant messages (no user messages between them)
    """
    recent_tool_calls = []
    consecutive_count = 0
    last_tool_call = None

    for msg in messages[-10:]:  # Check last 10 messages
        if msg.role == "assistant" and isinstance(msg.content, list):
            for block in msg.content:
                if isinstance(block, dict) and block.get("type") == "tool_use":
                    tool_name = block.get("name")
                    tool_input = json.dumps(block.get("input", {}), sort_keys=True)
                    current_call = (tool_name, tool_input)

                    if current_call == last_tool_call:
                        consecutive_count += 1
                    else:
                        consecutive_count = 1
                        last_tool_call = current_call

                    recent_tool_calls.append(current_call)
        elif msg.role == "user":
            # User message breaks the consecutive chain
            consecutive_count = 0
            last_tool_call = None

    # Only trigger if we have consecutive identical calls
    if consecutive_count >= threshold:
        return f"Detected infinite loop: tool '{last_tool_call[0]}' called {consecutive_count} times consecutively with same input"

    return None

def convert_claude_to_amazonq_request(req: ClaudeRequest, conversation_id: Optional[str] = None) -> Dict[str, Any]:
    """Convert ClaudeRequest to Amazon Q request body."""
    if conversation_id is None:
        conversation_id = str(uuid.uuid4())

    # Detect infinite tool call loops
    loop_error = _detect_tool_call_loop(req.messages, threshold=3)
    if loop_error:
        raise ValueError(loop_error)

    thinking_enabled = is_thinking_mode_enabled(getattr(req, "thinking", None))
        
    # 1. Tools
    aq_tools = []
    long_desc_tools = []
    if req.tools:
        for t in req.tools:
            if t.description and len(t.description) > 10240:
                long_desc_tools.append({"name": t.name, "full_description": t.description})
            aq_tools.append(convert_tool(t))
            
    # 2. Current Message (last user message)
    last_msg = req.messages[-1] if req.messages else None
    prompt_content = ""
    tool_results = None
    has_tool_result = False
    images = None
    
    if last_msg and last_msg.role == "user":
        content = last_msg.content
        images = extract_images_from_content(content)
        
        if isinstance(content, list):
            text_parts = []
            for block in content:
                if isinstance(block, dict):
                    btype = block.get("type")
                    if btype == "text":
                        text_parts.append(block.get("text", ""))
                    elif btype == "thinking":
                        text_parts.append(_wrap_thinking_content(block.get("thinking", "")))
                    elif btype == "tool_result":
                        has_tool_result = True
                        if tool_results is None:
                            tool_results = []
                        result = _process_tool_result_block(block)
                        # Merge if exists
                        existing = next((r for r in tool_results if r["toolUseId"] == result["toolUseId"]), None)
                        if existing:
                            existing["content"].extend(result["content"])
                            if result["status"] == "error":
                                existing["status"] = "error"
                        else:
                            tool_results.append(result)
            prompt_content = "\n".join(text_parts)
        else:
            prompt_content = extract_text_from_content(content)

    # Get tool_use order from the last assistant message for reordering current message's tool_results
    last_tool_use_order = []
    if len(req.messages) >= 2:
        # Find the last assistant message before the current user message
        for i in range(len(req.messages) - 2, -1, -1):
            if req.messages[i].role == "assistant":
                assistant_content = req.messages[i].content
                if isinstance(assistant_content, list):
                    for block in assistant_content:
                        if isinstance(block, dict) and block.get("type") == "tool_use":
                            tid = block.get("id")
                            if tid:
                                last_tool_use_order.append(tid)
                break

    # Reorder tool_results to match the order of tool_uses from the preceding assistant message
    if tool_results and last_tool_use_order:
        tool_results = _reorder_tool_results_by_tool_uses(tool_results, last_tool_use_order)
        logger.info(f"Reordered {len(tool_results)} current message tool_results to match tool_uses order")

    # 3. Context
    user_ctx = {
        "envState": {
            "operatingSystem": "macos",
            "currentWorkingDirectory": "/"
        }
    }
    if aq_tools:
        user_ctx["tools"] = aq_tools
    if tool_results:
        user_ctx["toolResults"] = tool_results
        
    # 4. Format Content
    formatted_content = ""
    if has_tool_result and not prompt_content:
        formatted_content = ""
    else:
        formatted_content = (
            "--- CONTEXT ENTRY BEGIN ---\n"
            f"Current time: {get_current_timestamp()}\n"
            "--- CONTEXT ENTRY END ---\n\n"
            "--- USER MESSAGE BEGIN ---\n"
            f"{prompt_content}\n"
            "--- USER MESSAGE END ---"
        )
        
    if long_desc_tools:
        docs = []
        for info in long_desc_tools:
            docs.append(f"Tool: {info['name']}\nFull Description:\n{info['full_description']}\n")
        formatted_content = (
            "--- TOOL DOCUMENTATION BEGIN ---\n"
            f"{''.join(docs)}"
            "--- TOOL DOCUMENTATION END ---\n\n"
            f"{formatted_content}"
        )
        
    if req.system and formatted_content:
        sys_text = ""
        if isinstance(req.system, str):
            sys_text = req.system
        elif isinstance(req.system, list):
            parts = []
            for b in req.system:
                if isinstance(b, dict) and b.get("type") == "text":
                    parts.append(b.get("text", ""))
            sys_text = "\n".join(parts)
            
        if sys_text:
            formatted_content = (
                "--- SYSTEM PROMPT BEGIN ---\n"
                f"{sys_text}\n"
                "--- SYSTEM PROMPT END ---\n\n"
                f"{formatted_content}"
            )

    # Append thinking hint at the very end, outside all structured blocks
    if thinking_enabled:
        formatted_content = _append_thinking_hint(formatted_content)

    # 5. Model
    model_id = map_model_name(req.model)

    # 6. User Input Message
    user_input_msg = {
        "content": formatted_content,
        "userInputMessageContext": user_ctx,
        "origin": "KIRO_CLI",
        "modelId": model_id
    }
    if images:
        user_input_msg["images"] = images
        
    # 7. History
    history_msgs = req.messages[:-1] if len(req.messages) > 1 else []
    aq_history = process_history(history_msgs, thinking_enabled=thinking_enabled, hint=THINKING_HINT)

    # Validate history alternation to prevent infinite loops
    _validate_history_alternation(aq_history)

    # 8. Final Body
    return {
        "conversationState": {
            "conversationId": conversation_id,
            "history": aq_history,
            "currentMessage": {
                "userInputMessage": user_input_msg
            },
            "chatTriggerType": "MANUAL"
        }
    }