from __future__ import annotations
import tomllib
from dataclasses import dataclass, field
from typing import List, Optional, Dict, Any, Union
from pathlib import Path

CONFIG_PATH = Path("config.toml")

def load_config() -> dict[str, Any]:
    with open(CONFIG_PATH, "rb") as f:
        return tomllib.load(f)

# Global constants for agent tools
AGENT_TOOL_NAMES = [
    "read_file",
    "list_directory",
    "search_files",
    "web_search",
    "fetch_url",
    "get_file_summary",
    "py_get_skeleton",
    "py_get_code_outline",
    "py_get_definition",
    "py_get_signature",
    "py_get_class_summary",
    "py_get_var_declaration",
    "py_get_docstring",
    "py_find_usages",
    "py_get_imports",
    "py_check_syntax",
    "py_get_hierarchy"
]

@dataclass
class Ticket:
    """
    Represents a discrete unit of work within a track.
    """

    id: str
    description: str
    status: str = "todo"
    assigned_to: str = "unassigned"
    target_file: Optional[str] = None
    target_symbols: List[str] = field(default_factory=list)
    context_requirements: List[str] = field(default_factory=list)
    depends_on: List[str] = field(default_factory=list)
    blocked_reason: Optional[str] = None
    step_mode: bool = False
    retry_count: int = 0

    def mark_blocked(self, reason: str) -> None:
        """Sets the ticket status to 'blocked' and records the reason."""
        self.status = "blocked"
        self.blocked_reason = reason

    def mark_complete(self) -> None:
        """Sets the ticket status to 'completed'."""
        self.status = "completed"

    def get(self, key: str, default: Any = None) -> Any:
        """Helper to provide dictionary-like access to dataclass fields."""
        return getattr(self, key, default)

    def to_dict(self) -> Dict[str, Any]:
        return {
            "id": self.id,
            "description": self.description,
            "status": self.status,
            "assigned_to": self.assigned_to,
            "target_file": self.target_file,
            "target_symbols": self.target_symbols,
            "context_requirements": self.context_requirements,
            "depends_on": self.depends_on,
            "blocked_reason": self.blocked_reason,
            "step_mode": self.step_mode,
            "retry_count": self.retry_count,
        }

    @classmethod
    def from_dict(cls, data: Dict[str, Any]) -> "Ticket":
        return cls(
            id=data["id"],
            description=data.get("description", ""),
            status=data.get("status", "todo"),
            assigned_to=data.get("assigned_to", ""),
            target_file=data.get("target_file"),
            target_symbols=data.get("target_symbols", []),
            context_requirements=data.get("context_requirements", []),
            depends_on=data.get("depends_on", []),
            blocked_reason=data.get("blocked_reason"),
            step_mode=data.get("step_mode", False),
            retry_count=data.get("retry_count", 0),
        )


@dataclass
class Track:
    """
    Represents a collection of tickets that together form an architectural track or epic.
    """

    id: str
    description: str
    tickets: List[Ticket] = field(default_factory=list)

    def to_dict(self) -> Dict[str, Any]:
        return {
            "id": self.id,
            "description": self.description,
            "tickets": [t.to_dict() for t in self.tickets],
        }

    @classmethod
    def from_dict(cls, data: Dict[str, Any]) -> "Track":
        return cls(
            id=data["id"],
            description=data.get("description", ""),
            tickets=[Ticket.from_dict(t) for t in data.get("tickets", [])],
        )


@dataclass
class WorkerContext:
    """
    State preserved for a specific worker throughout its ticket lifecycle.
    """

    ticket_id: str
    model_name: str
    messages: List[Dict[str, Any]] = field(default_factory=list)


@dataclass
class Metadata:
    id: str
    name: str
    status: str
    created_at: Union[str, Any]
    updated_at: Union[str, Any]

    def to_dict(self) -> Dict[str, Any]:
        return {
            "id": self.id,
            "name": self.name,
            "status": self.status,
            "created_at": str(self.created_at),
            "updated_at": str(self.updated_at),
        }

    @classmethod
    def from_dict(cls, data: Dict[str, Any]) -> "Metadata":
        return cls(
            id=data["id"],
            name=data.get("name", ""),
            status=data.get("status", "todo"),
            created_at=data.get("created_at"),
            updated_at=data.get("updated_at"),
        )


@dataclass
class TrackState:
    metadata: Metadata
    discussion: List[str] = field(default_factory=list)
    tasks: List[Ticket] = field(default_factory=list)

    def to_dict(self) -> Dict[str, Any]:
        return {
            "metadata": self.metadata.to_dict(),
            "discussion": self.discussion,
            "tasks": [t.to_dict() for t in self.tasks],
        }

    @classmethod
    def from_dict(cls, data: Dict[str, Any]) -> "TrackState":
        return cls(
            metadata=Metadata.from_dict(data["metadata"]),
            discussion=data.get("discussion", []),
            tasks=[Ticket.from_dict(t) for t in data.get("tasks", [])],
        )