import dts = require("utils/utils");
import { Color } from "color";
import * as fsModule from "file-system";
import {
    enabled as traceEnabled, write as traceWrite, categories as traceCategories,
    messageType as traceMessageType, notifyEvent as traceNotifyEvent, isCategorySet
} from "trace";

export * from "./utils-common";

function isOrientationLandscape(orientation: number) {
    return orientation === UIDeviceOrientation.LandscapeLeft || orientation === UIDeviceOrientation.LandscapeRight;
}

export module layout {
    var MODE_SHIFT = 30;
    var MODE_MASK = 0x3 << MODE_SHIFT;

    export function makeMeasureSpec(size: number, mode: number): number {
        return (Math.round(size) & ~MODE_MASK) | (mode & MODE_MASK);
    }

    export function getDisplayDensity(): number {
        return 1;
    }

    export function toDevicePixels(value: number): number {
        return value * getDisplayDensity();
    }

    export function toDeviceIndependentPixels(value: number): number {
        return value / getDisplayDensity();
    }
}

export module ios {
    export function setTextAlignment(view: dts.ios.TextUIView, value: string) {
        switch (value) {
            case "left":
                view.textAlignment = NSTextAlignment.Left;
                break;
            case "center":
                view.textAlignment = NSTextAlignment.Center;
                break;
            case "right":
                view.textAlignment = NSTextAlignment.Right;
                break;
            default:
                break;
        }
    }

    export function getter<T>(_this: any, property: T | { (): T }): T {
        if (typeof property === "function") {
            return (<{ (): T }>property).call(_this);
        } else {
            return <T>property;
        }
    }

    export function getTransformedText(view, source: string, transform: string): string {
        let result = source;

        switch (transform) {
            case "uppercase":
                result = NSStringFromNSAttributedString(source).uppercaseString;
                break;

            case "lowercase":
                result = NSStringFromNSAttributedString(source).lowercaseString;
                break;

            case "capitalize":
                result = NSStringFromNSAttributedString(source).capitalizedString;
                break;

            case "none":
            default:
                result = view.text;
                break;
        }

        return result;
    }

    function NSStringFromNSAttributedString(source: NSAttributedString | string): NSString {
        return NSString.stringWithString(source instanceof NSAttributedString && source.string || <string>source);
    }

    export function setWhiteSpace(view: dts.ios.TextUIView, value: string, parentView?: UIView) {
        if (value === "normal") {
            view.lineBreakMode = NSLineBreakMode.ByWordWrapping;
            view.numberOfLines = 0;
        }
        else {
            if (parentView) {
                view.lineBreakMode = NSLineBreakMode.ByTruncatingMiddle;
            } else {
                view.lineBreakMode = NSLineBreakMode.ByTruncatingTail;
            }
            view.numberOfLines = 1;
        }
    }

    export module collections {
        export function jsArrayToNSArray(str: string[]): NSArray<any> {
            return NSArray.arrayWithArray(<any>str);
        }

        export function nsArrayToJSArray(a: NSArray<any>): Array<Object> {
            var arr = [];
            if ("undefined" !== typeof a) {
                let count = a.count;
                for (let i = 0; i < count; i++) {
                    arr.push(a.objectAtIndex(i));
                }
            }

            return arr;
        }
    }

    export function getColor(uiColor: UIColor): Color {
        var redRef = new interop.Reference<number>();
        var greenRef = new interop.Reference<number>();
        var blueRef = new interop.Reference<number>();
        var alphaRef = new interop.Reference<number>();

        uiColor.getRedGreenBlueAlpha(redRef, greenRef, blueRef, alphaRef);
        var red = redRef.value * 255;
        var green = greenRef.value * 255;
        var blue = blueRef.value * 255;
        var alpha = alphaRef.value * 255;

        return new Color(alpha, red, green, blue);
    }

    export function isLandscape(): boolean {
        var device = getter(UIDevice, UIDevice.currentDevice);
        var statusBarOrientation = getter(UIApplication, UIApplication.sharedApplication).statusBarOrientation;
        var isStatusBarOrientationLandscape = isOrientationLandscape(statusBarOrientation);
        return isOrientationLandscape(device.orientation) || isStatusBarOrientationLandscape;
    }

    export var MajorVersion = NSString.stringWithString(getter(UIDevice, UIDevice.currentDevice).systemVersion).intValue;

    export function openFile(filePath: string): boolean {
        try {
            var fs: typeof fsModule = require("file-system");
            var path = filePath.replace("~", fs.knownFolders.currentApp().path)

            var controller = UIDocumentInteractionController.interactionControllerWithURL(NSURL.fileURLWithPath(path));
            controller.delegate = new UIDocumentInteractionControllerDelegateImpl();
            return controller.presentPreviewAnimated(true);
        }
        catch (e) {
            traceWrite("Error in openFile", traceCategories.Error, traceMessageType.error);
        }
        return false;
    }
}

export function GC() {
    __collect();
}

export function openUrl(location: string): boolean {
    try {
        var url = NSURL.URLWithString(location.trim());
        if (ios.getter(UIApplication, UIApplication.sharedApplication).canOpenURL(url)) {
            return ios.getter(UIApplication, UIApplication.sharedApplication).openURL(url);
        }
    }
    catch (e) {
        // We Don't do anything with an error.  We just output it
        traceWrite("Error in OpenURL", traceCategories.Error, traceMessageType.error);
    }
    return false;
}

class UIDocumentInteractionControllerDelegateImpl extends NSObject implements UIDocumentInteractionControllerDelegate {
    public static ObjCProtocols = [UIDocumentInteractionControllerDelegate];

    public getViewController(): UIViewController {
        var frame = require("ui/frame");
        return frame.topmost().currentPage.ios;
    }

    public documentInteractionControllerViewControllerForPreview(controller: UIDocumentInteractionController) {
        return this.getViewController();
    }

    public documentInteractionControllerViewForPreview(controller: UIDocumentInteractionController) {
        return this.getViewController().view;
    }

    public documentInteractionControllerRectForPreview(controller: UIDocumentInteractionController): CGRect {
        return this.getViewController().view.frame;
    }
}