"use client";

import { useState, useCallback, useRef } from "react";
import { saveAnnotation, getAnnotationsForVersion } from "@/actions/annotations";
import type { AnnotationShape, AnnotationDrawingData } from "@/types";
import { useReviewStore } from "@/hooks/use-review-player";
import { useToast } from "@/components/ui/use-toast";
import { v4 as uuidv4 } from "uuid";

interface UseAnnotationsOptions {
  versionId: string;
  fps: number;
}

export function useAnnotations({ versionId, fps }: UseAnnotationsOptions) {
  const [savedAnnotations, setSavedAnnotations] = useState<
    { id: string; frameNumber: number; drawingData: AnnotationDrawingData }[]
  >([]);
  const [sessionShapes, setSessionShapes] = useState<AnnotationShape[]>([]);
  const [currentShape, setCurrentShape] = useState<AnnotationShape | null>(null);
  const [isDrawing, setIsDrawing] = useState(false);
  const { selectedTool, selectedColor, strokeWidth } = useReviewStore();
  const { toast } = useToast();

  const startShape = useCallback(
    (frameNumber: number, point: { x: number; y: number }) => {
      const shape: AnnotationShape = {
        id: uuidv4(),
        tool: selectedTool,
        points: [point],
        color: selectedColor,
        strokeWidth,
        frameNumber,
      };
      setCurrentShape(shape);
      setIsDrawing(true);
    },
    [selectedTool, selectedColor, strokeWidth]
  );

  const addPoint = useCallback((point: { x: number; y: number }) => {
    setCurrentShape((prev) =>
      prev ? { ...prev, points: [...prev.points, point] } : null
    );
  }, []);

  const finishShape = useCallback(
    async (canvasWidth: number, canvasHeight: number) => {
      if (!currentShape) return;
      const finished = currentShape;
      setSessionShapes((prev) => [...prev, finished]);
      setCurrentShape(null);
      setIsDrawing(false);

      const drawingData: AnnotationDrawingData = {
        shapes: [finished],
        canvasWidth,
        canvasHeight,
        version: "1.0",
      };

      try {
        await saveAnnotation({
          versionId,
          frameNumber: finished.frameNumber,
          drawingData,
          color: selectedColor,
        });
      } catch {
        toast({ title: "Failed to save annotation", variant: "destructive" });
      }
    },
    [currentShape, versionId, selectedColor, toast]
  );

  const clearSessionShapes = useCallback((frameNumber?: number) => {
    if (frameNumber !== undefined) {
      setSessionShapes((prev) => prev.filter((s) => s.frameNumber !== frameNumber));
    } else {
      setSessionShapes([]);
    }
  }, []);

  const loadAnnotations = useCallback(async () => {
    try {
      const data = await getAnnotationsForVersion(versionId);
      setSavedAnnotations(data as any);
    } catch {
      // non-fatal
    }
  }, [versionId]);

  return {
    savedAnnotations,
    sessionShapes,
    currentShape,
    isDrawing,
    startShape,
    addPoint,
    finishShape,
    clearSessionShapes,
    loadAnnotations,
  };
}