"""Pydantic models for request/response schemas."""
from pydantic import BaseModel, Field
from typing import Optional, List, Dict, Any, Literal
from datetime import datetime, timezone
from .enums import ModelName


# ============ Auth Models ============

class TokenRequest(BaseModel):
    """Request for JWT token (can be extended with username/password)."""
    # Pour l'instant, on pourrait juste retourner un token
    # Plus tard, on peut ajouter username/password
    pass


class TokenResponse(BaseModel):
    """JWT token response."""
    access_token: str
    token_type: str = "bearer"
    expires_in: int


# ============ Completion Models ============

class CompletionRequest(BaseModel):
    """Request for text completion."""
    message: str = Field(..., description="User message to complete")
    model: ModelName = Field(default=ModelName.MISTRAL_LARGE, description="LLM model to use")
    agent: Optional[str] = Field(
        default=None,
        description="Agent identifier to use (ex: 'V1', 'V2', or 'AGENT'). If omitted, defaults to 'AGENT'."
    )
    stream: bool = Field(default=False, description="Enable streaming response")
    temperature: float = Field(default=0.7, ge=0.0, le=2.0, description="Sampling temperature")
    max_tokens: Optional[int] = Field(default=None, description="Maximum tokens to generate")
    conversation_history: Optional[List[Dict[str, str]]] = Field(
        default=None,
        description="Optional conversation history"
    )
    # Project-scoped retrieval
    project_id: Optional[str] = Field(default=None, description="Optional project id to scope retrieval")
    sources: Optional[List[str]] = Field(
        default=None,
        description="Optional list of document UUIDs to restrict project retrieval. Empty list or null means no restriction.",
    )
    # Server-side memory (LangGraph thread_id). When set, conversation history is managed by the server; conversation_history is ignored.
    conversation_id: Optional[str] = Field(
        default=None,
        description="Conversation id for server-side memory (thread_id). When set, conversation_history is ignored."
    )


class CompletionResponse(BaseModel):
    """Response for text completion (non-streaming)."""
    response: str
    model: str
    agent: Optional[str] = None
    usage: Optional[Dict[str, Any]] = None
    metadata: Optional[Dict[str, Any]] = None
    conversation_id: Optional[str] = Field(
        default=None,
        description="Conversation id used for this request. Reuse it in subsequent requests to maintain server-side memory."
    )


class StreamChunk(BaseModel):
    """Single chunk in streaming response."""
    content: str
    done: bool = False
    conversation_id: Optional[str] = Field(
        default=None,
        description="Conversation id present in every chunk. Reuse it in subsequent requests to maintain server-side memory."
    )
    metadata: Optional[Dict[str, Any]] = None


# ============ Transcription Models ============

class TranscriptionResponse(BaseModel):
    """Response for audio transcription.

    Usage, emissions, latency, etc. are under metadata.usage and metadata.emissions_*.
    """
    text: str
    language: Optional[str] = None
    duration_s: Optional[float] = None
    model: str = "whisper-1"
    metadata: Optional[Dict[str, Any]] = None


class TranscriptMessage(BaseModel):
    """Single message in a voice conversation transcript."""
    role: Literal["user", "assistant"]
    text: str
    timestamp: datetime


class TranscriptListResponse(BaseModel):
    """Transcript for a given conversation."""
    conversation_id: str
    messages: List[TranscriptMessage]


# ============ Model Info Models ============

class ModelInfo(BaseModel):
    """Information about an available model."""
    name: str
    provider: str
    description: Optional[str] = None
    supports_streaming: bool = True
    context_window: Optional[int] = None


class ModelsListResponse(BaseModel):
    """List of available models."""
    models: List[ModelInfo]
    total: int


class AgentInfo(BaseModel):
    """Information about an available agent."""
    type: str
    name: str
    description: str
    available: bool = True


class AgentsListResponse(BaseModel):
    """List of available agents."""
    agents: List[AgentInfo]
    total: int


# ============ Error Models ============

class ErrorResponse(BaseModel):
    """Error response."""
    error: str
    detail: Optional[str] = None
    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))


# ============ Health Check ============

class HealthResponse(BaseModel):
    """Health check response."""
    status: str
    version: str
    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))


# ============ Voice / VAD Models ============

class VadConfigDTO(BaseModel):
    """Voice Activity Detection configuration from client or settings.

    Domain DTO with validation. Mapping to Pipecat VADParams is done in
    services/voice/vad_config_service to keep domain independent of Pipecat.
    """
    vad_stop_secs: float = Field(
        default=0.2,
        ge=0.2,
        le=2.0,
        description="Seconds of silence before confirming speech has stopped",
    )
    vad_start_secs: float = Field(
        default=0.2,
        ge=0.1,
        le=0.5,
        description="Seconds of speech before confirming voice start",
    )
    vad_confidence: float = Field(
        default=0.7,
        ge=0.5,
        le=0.95,
        description="Minimum confidence threshold for voice detection (0-1)",
    )
    vad_min_volume: float = Field(
        default=0.6,
        ge=0.3,
        le=0.9,
        description="Minimum audio volume threshold for speech detection (0-1)",
    )


# ============ Upload / Ingestion Jobs ============

class UploadJobResponse(BaseModel):
    """Response returned when a background upload/ingestion job is created."""
    job_id: str
    status: str = "queued"
    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
    # Optional: server-measured audio duration for transcription jobs (seconds)
    duration_s: Optional[float] = None


class JobStatusResponse(BaseModel):
    """Snapshot of ingestion job status for polling."""
    job_id: str
    status: str
    # Logical job type: document_ingestion | transcription_audio | transcription_meeting | ...
    job_type: Optional[str] = None
    # Progress and stage
    progress: Optional[float] = None
    progress_percent: Optional[int] = None
    stage: Optional[str] = None  # upload | ocr | chunk | embed | index
    # Counters
    pages_total: Optional[int] = None
    pages_done: Optional[int] = None
    chunks_total: Optional[int] = None
    chunks_done: Optional[int] = None
    inserted_count: Optional[int] = None
    # Transcription-specific fields (for audio transcription jobs)
    transcript_text: Optional[str] = None
    transcript_language: Optional[str] = None
    transcript_duration: Optional[float] = None
    transcript_model: Optional[str] = None
    transcript_metadata: Optional[Dict[str, Any]] = None  # usage, emissions_kgCO2eq, latency_s, etc.
    # Error and timestamps
    error: Optional[str] = None
    created_at: Optional[datetime] = None
    started_at: Optional[datetime] = None
    updated_at: Optional[datetime] = None
    finished_at: Optional[datetime] = None


class DeleteDocumentResponse(BaseModel):
    """Response returned when deleting a document's vector chunks."""
    project_id: str
    document_id: str
    deleted_count: int