"""
Activity model for tracking tool usage and file operations.
"""

from datetime import datetime
from typing import Optional, Dict, Any
from sqlalchemy import String, Text, Integer, DateTime, JSON, ForeignKey, Boolean
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.sql import func

from .base import Base, TimestampMixin


class Activity(Base, TimestampMixin):
    """
    Represents a single tool usage or file operation during development.
    
    Activities are generated by Claude Code tool usage and provide
    detailed insight into the development workflow.
    """
    
    __tablename__ = "activities"
    
    # Primary key
    id: Mapped[int] = mapped_column(primary_key=True)
    
    # Foreign keys
    session_id: Mapped[int] = mapped_column(ForeignKey("sessions.id"), nullable=False, index=True)
    conversation_id: Mapped[Optional[int]] = mapped_column(
        ForeignKey("conversations.id"), 
        nullable=True,
        index=True
    )
    
    # Activity timing
    timestamp: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
        default=func.now(),
        index=True
    )
    
    # Activity details
    tool_name: Mapped[str] = mapped_column(String(50), nullable=False, index=True)
    action: Mapped[str] = mapped_column(String(100), nullable=False)
    file_path: Mapped[Optional[str]] = mapped_column(Text, nullable=True, index=True)
    
    # Metadata and results
    metadata: Mapped[Optional[Dict[str, Any]]] = mapped_column(JSON, nullable=True)
    success: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    error_message: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    
    # Code change metrics (for Edit/Write operations)
    lines_added: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    lines_removed: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    
    # Relationships
    session: Mapped["Session"] = relationship("Session", back_populates="activities")
    conversation: Mapped[Optional["Conversation"]] = relationship(
        "Conversation",
        foreign_keys=[conversation_id]
    )
    
    def __repr__(self) -> str:
        file_info = f", file='{self.file_path}'" if self.file_path else ""
        return f"<Activity(id={self.id}, tool='{self.tool_name}', action='{self.action}'{file_info})>"
    
    @property
    def is_file_operation(self) -> bool:
        """Check if this activity involves file operations."""
        return self.tool_name in {"Edit", "Write", "Read"}
    
    @property
    def is_code_execution(self) -> bool:
        """Check if this activity involves code/command execution."""
        return self.tool_name in {"Bash", "Task"}
    
    @property
    def is_search_operation(self) -> bool:
        """Check if this activity involves searching."""
        return self.tool_name in {"Grep", "Glob"}
    
    @property
    def total_lines_changed(self) -> int:
        """Get total lines changed (added + removed)."""
        added = self.lines_added or 0
        removed = self.lines_removed or 0
        return added + removed
    
    @property
    def net_lines_changed(self) -> int:
        """Get net lines changed (added - removed)."""
        added = self.lines_added or 0
        removed = self.lines_removed or 0
        return added - removed
    
    def get_file_extension(self) -> Optional[str]:
        """Extract file extension from file path."""
        if not self.file_path:
            return None
            
        if "." in self.file_path:
            return self.file_path.split(".")[-1].lower()
        return None
    
    def get_programming_language(self) -> Optional[str]:
        """Infer programming language from file extension."""
        ext = self.get_file_extension()
        if not ext:
            return None
            
        language_map = {
            "py": "python",
            "js": "javascript", 
            "ts": "typescript",
            "jsx": "javascript",
            "tsx": "typescript",
            "go": "go",
            "rs": "rust",
            "java": "java",
            "cpp": "cpp",
            "c": "c",
            "h": "c",
            "hpp": "cpp",
            "rb": "ruby",
            "php": "php",
            "html": "html",
            "css": "css",
            "scss": "scss",
            "sql": "sql",
            "md": "markdown",
            "yml": "yaml",
            "yaml": "yaml",
            "json": "json",
            "xml": "xml",
            "sh": "shell",
            "bash": "shell",
        }
        
        return language_map.get(ext)
    
    def is_successful(self) -> bool:
        """Check if the activity completed successfully."""
        return self.success and not self.error_message
    
    def get_command_executed(self) -> Optional[str]:
        """Get the command that was executed (for Bash activities)."""
        if self.tool_name == "Bash" and self.metadata:
            return self.metadata.get("command")
        return None
    
    def get_search_pattern(self) -> Optional[str]:
        """Get the search pattern (for Grep activities)."""
        if self.tool_name == "Grep" and self.metadata:
            return self.metadata.get("pattern")
        return None
    
    def get_task_type(self) -> Optional[str]:
        """Get the task type (for Task activities)."""
        if self.tool_name == "Task" and self.metadata:
            return self.metadata.get("task_type")
        return None