// Copyright 2024, Command Line Inc.
// SPDX-License-Identifier: Apache-2.0

import * as electron from "electron";
import { getWebServerEndpoint } from "../frontend/util/endpoints";

export const WaveAppPathVarName = "WAVETERM_APP_PATH";

export function delay(ms): Promise<void> {
    return new Promise((resolve) => setTimeout(resolve, ms));
}

function setCtrlShift(wc: Electron.WebContents, state: boolean) {
    wc.send("control-shift-state-update", state);
}

export function handleCtrlShiftFocus(sender: Electron.WebContents, focused: boolean) {
    if (!focused) {
        setCtrlShift(sender, false);
    }
}

export function handleCtrlShiftState(sender: Electron.WebContents, waveEvent: WaveKeyboardEvent) {
    if (waveEvent.type == "keyup") {
        if (waveEvent.key === "Control" || waveEvent.key === "Shift") {
            setCtrlShift(sender, false);
        }
        if (waveEvent.key == "Meta") {
            if (waveEvent.control && waveEvent.shift) {
                setCtrlShift(sender, true);
            }
        }
        return;
    }
    if (waveEvent.type == "keydown") {
        if (waveEvent.key === "Control" || waveEvent.key === "Shift" || waveEvent.key === "Meta") {
            if (waveEvent.control && waveEvent.shift && !waveEvent.meta) {
                // Set the control and shift without the Meta key
                setCtrlShift(sender, true);
            } else {
                // Unset if Meta is pressed
                setCtrlShift(sender, false);
            }
        }
        return;
    }
}

export function shNavHandler(event: Electron.Event<Electron.WebContentsWillNavigateEventParams>, url: string) {
    if (url.startsWith("http://127.0.0.1:5173/index.html") || url.startsWith("http://localhost:5173/index.html")) {
        // this is a dev-mode hot-reload, ignore it
        console.log("allowing hot-reload of index.html");
        return;
    }
    event.preventDefault();
    if (url.startsWith("https://") || url.startsWith("http://") || url.startsWith("file://")) {
        console.log("open external, shNav", url);
        electron.shell.openExternal(url);
    } else {
        console.log("navigation canceled", url);
    }
}

export function shFrameNavHandler(event: Electron.Event<Electron.WebContentsWillFrameNavigateEventParams>) {
    if (!event.frame?.parent) {
        // only use this handler to process iframe events (non-iframe events go to shNavHandler)
        return;
    }
    const url = event.url;
    console.log(`frame-navigation url=${url} frame=${event.frame.name}`);
    if (event.frame.name == "webview") {
        // "webview" links always open in new window
        // this will *not* effect the initial load because srcdoc does not count as an electron navigation
        console.log("open external, frameNav", url);
        event.preventDefault();
        electron.shell.openExternal(url);
        return;
    }
    if (
        event.frame.name == "pdfview" &&
        (url.startsWith("blob:file:///") || url.startsWith(getWebServerEndpoint() + "/wave/stream-file?"))
    ) {
        // allowed
        return;
    }
    event.preventDefault();
    console.log("frame navigation canceled");
}

function isWindowFullyVisible(bounds: electron.Rectangle): boolean {
    const displays = electron.screen.getAllDisplays();

    // Helper function to check if a point is inside any display
    function isPointInDisplay(x: number, y: number) {
        for (const display of displays) {
            const { x: dx, y: dy, width, height } = display.bounds;
            if (x >= dx && x < dx + width && y >= dy && y < dy + height) {
                return true;
            }
        }
        return false;
    }

    // Check all corners of the window
    const topLeft = isPointInDisplay(bounds.x, bounds.y);
    const topRight = isPointInDisplay(bounds.x + bounds.width, bounds.y);
    const bottomLeft = isPointInDisplay(bounds.x, bounds.y + bounds.height);
    const bottomRight = isPointInDisplay(bounds.x + bounds.width, bounds.y + bounds.height);

    return topLeft && topRight && bottomLeft && bottomRight;
}

function findDisplayWithMostArea(bounds: electron.Rectangle): electron.Display {
    const displays = electron.screen.getAllDisplays();
    let maxArea = 0;
    let bestDisplay = null;

    for (let display of displays) {
        const { x, y, width, height } = display.bounds;
        const overlapX = Math.max(0, Math.min(bounds.x + bounds.width, x + width) - Math.max(bounds.x, x));
        const overlapY = Math.max(0, Math.min(bounds.y + bounds.height, y + height) - Math.max(bounds.y, y));
        const overlapArea = overlapX * overlapY;

        if (overlapArea > maxArea) {
            maxArea = overlapArea;
            bestDisplay = display;
        }
    }

    return bestDisplay;
}

function adjustBoundsToFitDisplay(bounds: electron.Rectangle, display: electron.Display): electron.Rectangle {
    const { x: dx, y: dy, width: dWidth, height: dHeight } = display.workArea;
    let { x, y, width, height } = bounds;

    // Adjust width and height to fit within the display's work area
    width = Math.min(width, dWidth);
    height = Math.min(height, dHeight);

    // Adjust x to ensure the window fits within the display
    if (x < dx) {
        x = dx;
    } else if (x + width > dx + dWidth) {
        x = dx + dWidth - width;
    }

    // Adjust y to ensure the window fits within the display
    if (y < dy) {
        y = dy;
    } else if (y + height > dy + dHeight) {
        y = dy + dHeight - height;
    }
    return { x, y, width, height };
}

export function ensureBoundsAreVisible(bounds: electron.Rectangle): electron.Rectangle {
    if (!isWindowFullyVisible(bounds)) {
        let targetDisplay = findDisplayWithMostArea(bounds);

        if (!targetDisplay) {
            targetDisplay = electron.screen.getPrimaryDisplay();
        }

        return adjustBoundsToFitDisplay(bounds, targetDisplay);
    }
    return bounds;
}

export function waveKeyToElectronKey(waveKey: string): string {
    const waveParts = waveKey.split(":");
    const electronParts: Array<string> = waveParts.map((part: string) => {
        if (part == "ArrowUp") {
            return "Up";
        }
        if (part == "ArrowDown") {
            return "Down";
        }
        if (part == "ArrowLeft") {
            return "Left";
        }
        if (part == "ArrowRight") {
            return "Right";
        }

        return part;
    });
    return electronParts.join("+");
}