from typing import Tuple
import cv2
import numpy as np

from models import FingerQualityResult


class Visualizer:
    @staticmethod
    def draw_axis(img, center, vec, length, color, thickness=2):
        x0, y0 = center
        x1 = int(x0 + length * vec[0])
        y1 = int(y0 + length * vec[1])
        cv2.arrowedLine(img, (x0, y0), (x1, y1), color, thickness, tipLength=0.2)

    @staticmethod
    def draw_debug(
        img: np.ndarray,
        contour: np.ndarray,
        bbox: Tuple[int, int, int, int],
        angle_deg: float,
        result: FingerQualityResult
    ) -> np.ndarray:
        out = img.copy()
        x, y, w_box, h_box = bbox

        cv2.rectangle(out, (x, y), (x + w_box, y + h_box), (0, 255, 0), 2)
        cv2.drawContours(out, [contour], -1, (255, 0, 0), 2)

        pts = contour.reshape(-1, 2).astype(np.float64)
        mean, eigenvectors, _ = cv2.PCACompute2(pts, mean=np.empty(0))
        center = (int(mean[0, 0]), int(mean[0, 1]))
        main_vec = eigenvectors[0]
        Visualizer.draw_axis(out, center, main_vec, length=80, color=(0, 0, 255), thickness=2)

        text_lines = [
            f"Blur: {result.blur_score:.1f} ({'OK' if result.blur_pass else 'BAD'})",
            f"Illum: {result.illumination_score:.1f} ({'OK' if result.illumination_pass else 'BAD'})",
            f"Coverage: {result.coverage_ratio*100:.1f}% ({'OK' if result.coverage_pass else 'BAD'})",
            f"Angle: {angle_deg:.1f} deg ({'OK' if result.orientation_pass else 'BAD'})",
            f"Quality: {result.quality_score:.2f} ({'PASS' if result.overall_pass else 'FAIL'})",
        ]

        y0 = 25
        for line in text_lines:
            color = (0, 255, 0) if ("OK" in line or "PASS" in line) else (0, 0, 255)
            cv2.putText(out, line, (10, y0), cv2.FONT_HERSHEY_SIMPLEX, 0.6, color, 2, cv2.LINE_AA)
            y0 += 22

        return out