//
//  KMBackgroundModel.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2022/12/23.
//

import Cocoa

@objc enum KMBackgroundType: Int {
    case color = 0
    case file = 1
}

@objcMembers class KMBackgroundModel: KMWatermarkAdjectiveBaseModel {
    var type: KMBackgroundType = .color
    var color: NSColor? = NSColor.red
    var imagePath: String = ""
    
    var rotation: CGFloat = 0.0
    var opacity: CGFloat = 1.0
    
    var scale: CGFloat = 1.0
    
    var verticalMode: Int = 1
    var verticalSpace: CGFloat = 0.0
    var horizontalMode: Int = 1
    var horizontalSpace: CGFloat = 0.0
    
    var pagesString: String = ""
    
    var backgroundID: String = ""
    
    var image: NSImage!
    
    // 是否数据迁移(原App数据迁移)
    var isMigrate = false
    // 是否已被更新
    var isUpdated = false
    var modificationDate: TimeInterval?
    var isRemoved = false
    
    override func copy() -> Any {
        let model: KMBackgroundModel = KMBackgroundModel()
        model.type = self.type
        model.color = self.color
        model.imagePath = self.imagePath
        
        model.rotation = self.rotation
        model.opacity = self.opacity
        
        model.scale = self.scale
        
        model.verticalMode = self.verticalMode
        model.verticalSpace = self.verticalSpace
        model.horizontalMode = self.horizontalMode
        model.horizontalSpace = self.horizontalSpace
        
        model.pageRangeType = self.pageRangeType
        model.pagesString = self.pagesString
        
        model.backgroundID = self.backgroundID
        model.image = self.image
        model.isMigrate = self.isMigrate
        model.isUpdated = self.isUpdated
        model.modificationDate = self.modificationDate
        model.isRemoved = self.isRemoved
        
        return model
    }
    
    func drawImage(rect: CGRect) -> NSImage {
        var drawRect: CGRect = NSMakeRect(0, 0, 128, 160)

        let image = NSImage(size: drawRect.size)
        image.lockFocus()
        NSGraphicsContext.current?.imageInterpolation = .high

        NSGraphicsContext.saveGraphicsState()
        NSColor.clear.set()
        drawRect.fill()
        NSGraphicsContext.restoreGraphicsState()

        let context: CGContext = NSGraphicsContext.current!.cgContext
        let imageSize: NSSize = NSMakeSize(drawRect.size.width, drawRect.size.height)
        if (context != nil) {
            NSGraphicsContext.current = NSGraphicsContext(cgContext: context, flipped: false)
        }

        NSGraphicsContext.saveGraphicsState()
        if (self.type == .color) {
            var size = drawRect.size
            size.width *= self.scale
            size.height *= self.scale
            
            let radian = CGFloat(self.rotation) * (Double.pi/180.0)
            let t: CGAffineTransform =  CGAffineTransform(rotationAngle: radian)
            var rect = NSMakeRect(0, 0, size.width, size.height).applying(t)
            
            if (self.verticalMode == 0) {
                rect.origin.y = drawRect.size.height-rect.size.height
            } else if (self.verticalMode == 1) {
                rect.origin.y = (drawRect.size.height-rect.size.height) * 0.5
            } else if (self.verticalMode == 2) {
                rect.origin.y = 0
            }
            
            if (self.horizontalMode == 0) {
                rect.origin.x = 0
            } else if (self.horizontalMode == 1) {
                rect.origin.x = (drawRect.size.width-rect.size.width) * 0.5
            } else if (self.horizontalMode == 2) {
                rect.origin.x = drawRect.size.width-rect.size.width
            }
            
            rect.origin.x += self.horizontalSpace
            rect.origin.y += self.verticalSpace
            
            let contextCenter = NSPoint(x: rect.midX, y: rect.midY)
            context.translateBy(x: contextCenter.x, y: contextCenter.y)
            context.rotate(by: radian)
            context.translateBy(x: -contextCenter.x, y: -contextCenter.y)
         
            var red: CGFloat = 0
            var green: CGFloat = 0
            var blue: CGFloat = 0
            var alpha: CGFloat = 0
            self.color!.usingColorSpaceName(NSColorSpaceName.calibratedRGB)?.getRed(&red, green: &green, blue: &blue, alpha: &alpha)
            context.setFillColor(red: red, green: green, blue: blue, alpha: self.opacity);
            context.fill(NSMakeRect(rect.origin.x+(rect.size.width-size.width)/2.0,
                                                  rect.origin.y+(rect.size.height-size.height)/2.0,
                                                  size.width, size.height));
        } else if (self.type == .file) {
            let image = self.image
            var size: NSSize = image!.size
            size.width *= self.scale
            size.height *= self.scale
            
            var wScale = size.width / drawRect.size.width
            var hScale = size.height / drawRect.size.height
            
            var scale = max(wScale, hScale)
            if (scale > 1) {
                size.width /= scale
                size.height /= scale
            }
            
            let radian = CGFloat(self.rotation) * (Double.pi/180.0)
            let t: CGAffineTransform =  CGAffineTransform(rotationAngle: radian)
            var rect = NSMakeRect(0, 0, size.width, size.height).applying(t)
            
            if (self.verticalMode == 0) {
                rect.origin.y = drawRect.size.height-rect.size.height
            } else if (self.verticalMode == 1) {
                rect.origin.y = (drawRect.size.height-rect.size.height) * 0.5
            } else if (self.verticalMode == 2) {
                rect.origin.y = 0
            }
            
            if (self.horizontalMode == 0) {
                rect.origin.x = 0
            } else if (self.horizontalMode == 1) {
                rect.origin.x = (drawRect.size.width-rect.size.width) * 0.5
            } else if (self.horizontalMode == 2) {
                rect.origin.x = drawRect.size.width-rect.size.width
            }
            
            rect.origin.x += self.horizontalSpace
            rect.origin.y += self.verticalSpace
            
            let contextCenter = NSPoint(x: rect.midX, y: rect.midY)
            context.translateBy(x: contextCenter.x, y: contextCenter.y)
            context.rotate(by: radian)
            context.translateBy(x: -contextCenter.x, y: -contextCenter.y)
            
            let finalRect = NSMakeRect(rect.origin.x+(rect.size.width-size.width)/2.0,
                                       rect.origin.y+(rect.size.height-size.height)/2.0,
                                       size.width, size.height)
            image?.draw(in: NSMakeRect(rect.origin.x+(rect.size.width-size.width)/2.0,
                                       rect.origin.y+(rect.size.height-size.height)/2.0,
                                       size.width, size.height), from: NSZeroRect, operation: .sourceOver, fraction: self.opacity)
        }

        NSGraphicsContext.restoreGraphicsState()
        NSGraphicsContext.current?.imageInterpolation = .default
        image.unlockFocus()

        return image
    }
}

class KMBackgroundTemplateModel: KMBackgroundModel {
    var isSelected: Bool = false
    
}