"""
Detection Pipeline Schema Definitions

Source of truth for all detection SSE events and wire-format models.
Generates: Pydantic (detect/sse_contract.py), TypeScript (ui/detection-app/src/types/sse-contract.ts)

Pipeline-internal models that never cross the wire (e.g. Frame with np.ndarray)
live in detect/models.py and are NOT generated.
"""

from dataclasses import dataclass, field
from typing import List, Literal, Optional


# --- Enums as Literal unions (wire format, not Python Enum) ---

NodeStatus = Literal["idle", "processing", "completed", "error"]
DetectionSource = Literal["ocr", "local_vlm", "cloud_llm", "logo_match", "auxiliary"]
LogLevel = Literal["DEBUG", "INFO", "WARNING", "ERROR"]


# --- Nested components ---


@dataclass
class GraphNode:
    """A pipeline stage node."""

    id: str
    status: str = "idle"  # NodeStatus
    items_in: int = 0
    items_out: int = 0


@dataclass
class GraphEdge:
    """An edge between pipeline stages."""

    source: str
    target: str
    throughput: int = 0


@dataclass
class BoundingBoxEvent:
    """Bounding box in SSE event payloads."""

    x: int
    y: int
    w: int
    h: int
    confidence: float
    label: str
    resolved_brand: Optional[str] = None
    source: Optional[str] = None
    stage: Optional[str] = None


@dataclass
class BrandSummary:
    """Per-brand stats in the final report."""

    brand: str
    total_appearances: int = 0
    total_screen_time: float = 0.0
    avg_confidence: float = 0.0
    first_seen: float = 0.0
    last_seen: float = 0.0


# --- SSE event payloads ---


@dataclass
class GraphUpdate:
    """Pipeline node state transition. SSE event: graph_update"""

    nodes: List[GraphNode] = field(default_factory=list)
    edges: List[GraphEdge] = field(default_factory=list)
    active_path: List[str] = field(default_factory=list)


@dataclass
class StatsUpdate:
    """Funnel statistics snapshot. SSE event: stats_update"""

    frames_extracted: int = 0
    frames_after_scene_filter: int = 0
    cv_regions_detected: int = 0
    regions_detected: int = 0
    regions_resolved_by_ocr: int = 0
    regions_escalated_to_local_vlm: int = 0
    regions_escalated_to_cloud_llm: int = 0
    cloud_llm_calls: int = 0
    processing_time_seconds: float = 0.0
    estimated_cloud_cost_usd: float = 0.0


@dataclass
class FrameUpdate:
    """Current frame being processed. SSE event: frame_update"""

    frame_ref: int
    timestamp: float
    jpeg_b64: str
    boxes: List[BoundingBoxEvent] = field(default_factory=list)


@dataclass
class Detection:
    """A confirmed brand detection. SSE event: detection"""

    brand: str
    timestamp: float
    duration: float
    confidence: float
    source: str  # DetectionSource
    content_type: str
    bbox: Optional[BoundingBoxEvent] = None
    frame_ref: Optional[int] = None


@dataclass
class LogEvent:
    """Pipeline log line. SSE event: log"""

    level: str  # LogLevel
    stage: str
    msg: str
    ts: str
    trace_id: Optional[str] = None


@dataclass
class DetectionReportSummary:
    """Final detection report summary."""

    video_source: str
    content_type: str
    duration_seconds: float
    total_detections: int = 0
    brands: List[BrandSummary] = field(default_factory=list)
    stats: Optional[StatsUpdate] = None


@dataclass
class JobComplete:
    """Final report when pipeline finishes. SSE event: job_complete"""

    job_id: str
    report: Optional[DetectionReportSummary] = None


@dataclass
class RunContext:
    """Run context injected into all SSE events for grouping."""

    run_id: str
    parent_job_id: str
    run_type: str = "initial"  # initial | replay | retry


# --- Checkpoint API types ---


@dataclass
class CheckpointInfo:
    """Available checkpoint for a stage."""

    stage: str
    is_scenario: bool = False
    scenario_label: str = ""


@dataclass
class ReplayRequest:
    """Request to replay pipeline from a specific stage."""

    job_id: str
    start_stage: str
    config_overrides: Optional[dict] = None


@dataclass
class ReplayResponse:
    """Result of a replay invocation."""

    status: str
    job_id: str
    start_stage: str
    detections: int = 0
    brands_found: int = 0


@dataclass
class RetryRequest:
    """Request to queue async retry with different config."""

    job_id: str
    config_overrides: Optional[dict] = None
    start_stage: str = "escalate_vlm"
    schedule_seconds: Optional[float] = None


@dataclass
class RetryResponse:
    """Result of queueing a retry task."""

    status: str
    task_id: str
    job_id: str


# --- Export lists for modelgen ---

DETECT_VIEWS = [
    GraphNode,
    GraphEdge,
    BoundingBoxEvent,
    BrandSummary,
    GraphUpdate,
    StatsUpdate,
    FrameUpdate,
    Detection,
    LogEvent,
    DetectionReportSummary,
    JobComplete,
    RunContext,
    CheckpointInfo,
    ReplayRequest,
    ReplayResponse,
    RetryRequest,
    RetryResponse,
]