%% 坐席端截图+拍照功能 — 类图
%% 文件: docs/03-技术架构/class-diagram.mermaid

classDiagram
    %% ===== 类型定义 =====
    class PendingImage {
        +id: string
        +blob: Blob
        +previewUrl: string
        +source: "screenshot" | "camera"
        +createdAt: number
    }

    class SelectionBox {
        +x: number
        +y: number
        +w: number
        +h: number
    }

    class EditHistoryEntry {
        +imageData: ImageData
        +timestamp: number
    }

    class ScreenshotToolConfig {
        +name: ScreenshotTool
        +icon: string
        +label: string
    }

    %% ===== Composables =====
    class useScreenCapture {
        -isCapturing: Ref~boolean~
        +isScreenCaptureSupported() boolean
        +captureScreen() Promise~Blob | null~
        +captureScreenAsCanvas() Promise~HTMLCanvasElement | null~
    }

    class useCamera {
        -isActive: Ref~boolean~
        -error: Ref~CameraError | null~
        -stream: MediaStream | null
        +startCamera(facingMode?) Promise~boolean~
        +stopCamera() void
        +captureFrame() Promise~Blob | null~
        +switchCamera() Promise~boolean~
    }

    class usePendingImages {
        -images: Ref~PendingImage[]~
        +addImage(blob: Blob, source: string) void
        +removeImage(id: string) void
        +clearAll() void
        +hasImages: ComputedRef~boolean~
        +count: ComputedRef~number~
    }

    %% ===== 组件 =====
    class ScreenCapture {
        +props: screenshotCanvas: HTMLCanvasElement
        +emit: confirm(blob: Blob)
        +emit: cancel()
        -box: Ref~SelectionBox~
        -currentTool: Ref~ScreenshotTool~
        -currentColor: Ref~string~
        -history: EditHistoryEntry[]
        -historyIndex: number
        +startSelect(e: MouseEvent) void
        +onMove(e: MouseEvent) void
        +startResize(dir: string, e: MouseEvent) void
        +drawMosaic(x1, y1, x2, y2) void
        +drawArrow(x1, y1, x2, y2) void
        +drawText(x, y, text) void
        +undo() void
        +confirm() void
        +cancel() void
    }

    class CameraCapture {
        +props: modelValue: boolean
        +emit: confirm(blob: Blob)
        +emit: cancel()
        +emit: update:modelValue(boolean)
        -videoRef: Ref~HTMLVideoElement~
        -capturedImage: Ref~string | null~
        -cameraError: Ref~CameraError | null~
        +startCamera() void
        +capture() void
        +retake() void
        +confirm() void
        +close() void
    }

    class PendingImagePreview {
        +props: images: PendingImage[]
        +emit: remove(id: string)
    }

    class ReplyBox {
        -pendingImages: usePendingImages
        -showScreenCapture: Ref~boolean~
        -showCameraDialog: Ref~boolean~
        -screenshotCanvas: Ref~HTMLCanvasElement | null~
        +handleScreenshot() Promise~void~
        +handleCamera() void
        +onScreenCaptureConfirm(blob: Blob) void
        +onCameraConfirm(blob: Blob) void
        +onCameraCancel() void
        +removePendingImage(id: string) void
        +handleSend() Promise~void~
        +sendPendingImages(convId: string) Promise~void~
    }

    %% ===== 关系 =====
    ReplyBox --> useScreenCapture : 调用截图
    ReplyBox --> useCamera : 调用拍照
    ReplyBox --> usePendingImages : 管理待发送图片
    ReplyBox --> ScreenCapture : 挂载截图编辑器
    ReplyBox --> CameraCapture : 挂载拍照弹窗
    ReplyBox --> PendingImagePreview : 挂载预览条
    ScreenCapture --> SelectionBox : 选区状态
    ScreenCapture --> EditHistoryEntry : 撤销历史
    CameraCapture --> useCamera : 摄像头逻辑
    PendingImagePreview --> PendingImage : 渲染缩略图
    usePendingImages --> PendingImage : 管理队列