"""
Inference Server API Schema Definitions

Source of truth for GPU inference server request/response types.
Generates: Pydantic (gpu/models/inference_contract.py)

These are the wire-format types for the HTTP API between the
pipeline (detect/) and the inference server (gpu/).
"""

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


# --- Object Detection (YOLO) ---


@dataclass
class DetectRequest:
    """Request body for object detection."""

    image: str  # base64 JPEG
    model: Optional[str] = None
    confidence: Optional[float] = None
    target_classes: Optional[List[str]] = None


@dataclass
class BBox:
    """A detected bounding box."""

    x: int
    y: int
    w: int
    h: int
    confidence: float
    label: str


@dataclass
class DetectResponse:
    """Response from object detection."""

    detections: List[BBox] = field(default_factory=list)


# --- OCR ---


@dataclass
class OCRRequest:
    """Request body for OCR."""

    image: str  # base64 JPEG
    languages: Optional[List[str]] = None


@dataclass
class OCRTextResult:
    """A single OCR text extraction result."""

    text: str
    confidence: float
    bbox: List[int] = field(default_factory=list)  # [x, y, w, h]


@dataclass
class OCRResponse:
    """Response from OCR."""

    results: List[OCRTextResult] = field(default_factory=list)


# --- Preprocessing ---


@dataclass
class PreprocessRequest:
    """Request body for image preprocessing."""

    image: str  # base64 JPEG
    binarize: bool = False
    deskew: bool = False
    contrast: bool = True


@dataclass
class PreprocessResponse:
    """Response from preprocessing."""

    image: str  # base64 JPEG of processed image


# --- VLM ---


@dataclass
class VLMRequest:
    """Request body for visual language model query."""

    image: str  # base64 JPEG
    prompt: str
    model: Optional[str] = None


@dataclass
class VLMResponse:
    """Response from VLM."""

    brand: str
    confidence: float
    reasoning: str


# --- CV Region Analysis ---


@dataclass
class AnalyzeRegionsRequest:
    """Request body for CV region analysis."""

    image: str  # base64 JPEG
    # Edge detection (Canny + HoughLinesP)
    edge_canny_low: int = 50
    edge_canny_high: int = 150
    edge_hough_threshold: int = 80
    edge_hough_min_length: int = 100
    edge_hough_max_gap: int = 10
    edge_pair_max_distance: int = 200
    edge_pair_min_distance: int = 15


@dataclass
class RegionBox:
    """A candidate region from CV analysis."""

    x: int
    y: int
    w: int
    h: int
    confidence: float
    label: str


@dataclass
class AnalyzeRegionsResponse:
    """Response from CV region analysis."""

    regions: List[RegionBox] = field(default_factory=list)


@dataclass
class AnalyzeRegionsDebugResponse:
    """Response from CV region analysis with debug overlays."""

    regions: List[RegionBox] = field(default_factory=list)
    edge_overlay_b64: str = ""       # Canny edge image as base64 JPEG
    lines_overlay_b64: str = ""      # frame with Hough lines drawn
    horizontal_count: int = 0
    pair_count: int = 0


# --- Field Segmentation ---


@dataclass
class SegmentFieldRequest:
    """Request body for field segmentation."""
    image: str  # base64 JPEG
    hue_low: int = 30
    hue_high: int = 85
    sat_low: int = 30
    sat_high: int = 255
    val_low: int = 30
    val_high: int = 255
    morph_kernel: int = 15
    min_area_ratio: float = 0.05


@dataclass
class SegmentFieldResponse:
    """Response from field segmentation."""
    boundary: List[List[int]] = field(default_factory=list)
    coverage: float = 0.0
    mask_b64: str = ""  # binary mask as base64 PNG (for downstream stages)


@dataclass
class SegmentFieldDebugResponse:
    """Response from field segmentation with debug overlay."""
    boundary: List[List[int]] = field(default_factory=list)
    coverage: float = 0.0
    mask_overlay_b64: str = ""


# --- Server Config ---


@dataclass
class ConfigUpdate:
    """Request body for updating server configuration."""

    device: Optional[str] = None
    yolo_model: Optional[str] = None
    yolo_confidence: Optional[float] = None
    vram_budget_mb: Optional[int] = None
    strategy: Optional[str] = None
    ocr_languages: Optional[List[str]] = None
    ocr_min_confidence: Optional[float] = None


# --- Export list for modelgen ---

INFERENCE_VIEWS = [
    DetectRequest,
    BBox,
    DetectResponse,
    OCRRequest,
    OCRTextResult,
    OCRResponse,
    PreprocessRequest,
    PreprocessResponse,
    VLMRequest,
    VLMResponse,
    AnalyzeRegionsRequest,
    RegionBox,
    AnalyzeRegionsResponse,
    AnalyzeRegionsDebugResponse,
    SegmentFieldRequest,
    SegmentFieldResponse,
    SegmentFieldDebugResponse,
    ConfigUpdate,
]