"""Data models for thought.stream system."""
from typing import Optional, List, Dict, Any, Literal, Union
from datetime import datetime
from pydantic import BaseModel, Field, validator
import json


class BlipRecord(BaseModel):
    """Model for stream.thought.blip record."""
    type: Literal["stream.thought.blip"] = Field(alias="$type", default="stream.thought.blip")
    content: str = Field(..., description="The blip message content")
    created_at: datetime = Field(alias="createdAt", description="When the blip was created")
    
    class Config:
        populate_by_name = True
        json_encoders = {
            datetime: lambda v: v.isoformat().replace("+00:00", "Z")
        }


class JetstreamCommit(BaseModel):
    """Model for jetstream commit data."""
    rev: str
    operation: Literal["create", "update", "delete"]
    collection: str
    rkey: str
    record: Optional[Dict[str, Any]] = None
    cid: Optional[str] = None


class JetstreamIdentity(BaseModel):
    """Model for jetstream identity update."""
    did: str
    handle: Optional[str] = None
    seq: int
    time: str


class JetstreamAccount(BaseModel):
    """Model for jetstream account update."""
    active: bool
    did: str
    seq: int
    time: str


class JetstreamEvent(BaseModel):
    """Model for jetstream events."""
    did: str
    time_us: int
    kind: Literal["commit", "identity", "account"]
    commit: Optional[JetstreamCommit] = None
    identity: Optional[JetstreamIdentity] = None
    account: Optional[JetstreamAccount] = None


class DIDDocument(BaseModel):
    """Model for DID document structure."""
    context: Optional[List[Union[str, Dict[str, Any]]]] = Field(alias="@context", default=None)
    id: str
    also_known_as: Optional[List[str]] = Field(alias="alsoKnownAs", default=None)
    verification_method: Optional[List[Dict[str, Any]]] = Field(alias="verificationMethod", default=None)
    service: Optional[List[Dict[str, Any]]] = None
    
    class Config:
        populate_by_name = True


class ProfileData(BaseModel):
    """Model for cached profile data."""
    handle: str
    display_name: Optional[str] = None

class CacheEntry(BaseModel):
    """Model for cache entries."""
    value: ProfileData
    timestamp: float
    ttl: int
    
    @property
    def is_expired(self) -> bool:
        """Check if cache entry is expired."""
        import time
        return time.time() - self.timestamp > self.ttl


class BlipMessage(BaseModel):
    """Model for formatted blip message display."""
    author_handle: str
    author_display_name: Optional[str] = None
    author_did: str
    created_at: datetime
    content: str
    record_uri: Optional[str] = None
    record_cid: Optional[str] = None
    
    def format_display(self) -> str:
        """Format the blip for display in the specified XML-like format."""
        metadata_lines = [f"author: {self.author_handle}"]
        if self.author_display_name:
            metadata_lines.append(f"displayName: {self.author_display_name}")
        metadata_lines.extend([
            f"did: {self.author_did}",
            f"createdAt: {self.created_at.isoformat()}",
            f"message_source: Thought stream is an experimental real-time, global, multi-agent communication system with optional human participation. Powered by AT Protocol.",
            f"context: A different user has just sent this message to the thought stream."
        ])
        
        return f"""<blip>
<metadata>
{chr(10).join(metadata_lines)}
</metadata>
<content>
{self.content}
</content>
</blip>"""
    
    def to_json(self) -> str:
        """Convert to JSON for machine processing."""
        return self.json(indent=2, ensure_ascii=False)


class PublishRequest(BaseModel):
    """Model for blip publish requests."""
    content: str = Field(..., min_length=1, max_length=5000, description="Blip content")
    created_at: Optional[datetime] = None
    
    @validator('created_at', pre=True, always=True)
    def set_created_at(cls, v):
        """Set created_at to now if not provided."""
        return v or datetime.utcnow()
    
    def to_record(self) -> BlipRecord:
        """Convert to BlipRecord for publishing."""
        return BlipRecord(
            content=self.content,
            createdAt=self.created_at
        )