// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

import {
    ActionContext,
    AppAction,
    AppAgent,
    ActionResult,
    ActionResultSuccess,
} from "@typeagent/agent-sdk";
import {
    createActionResult,
    createActionResultFromError,
    createActionResultFromHtmlDisplayWithScript,
} from "@typeagent/agent-sdk/helpers/action";
import { ImageInPaintItem, openai, VideoGenerationJob } from "aiclient";
import { CreateVideoAction, VideoAction } from "./videoActionSchema.js";
import { displayStatus } from "@typeagent/agent-sdk/helpers/display";
import { randomBytes } from "crypto";
import { getMimeType } from "typechat-utils";

export function instantiate(): AppAgent {
    return {
        executeAction: executeVideoAction,
    };
}

type VideoActionContext = {
    store: undefined;
};

async function executeVideoAction(
    action: AppAction,
    context: ActionContext<VideoActionContext>,
) {
    let result = await handleVideoAction(action as VideoAction, context);
    return result;
}

async function handleVideoAction(
    action: VideoAction,
    videoContext: ActionContext<VideoActionContext>,
) {
    let result: ActionResult | undefined = undefined;
    switch (action.actionName) {
        case "createVideoAction":
            displayStatus(
                "Submitting video generation request...",
                videoContext,
            );

            const createVideoAction: CreateVideoAction =
                action as CreateVideoAction;
            // TODO: dynamic duration
            const videoModel = openai.createVideoModel();
            const response = await videoModel.generateVideo(
                createVideoAction.parameters.caption,
                1,
                parseInt(createVideoAction.parameters.duration ?? "4") as
                    | 4
                    | 8
                    | 12,
                1280,
                720,
                await getInPaintItems(
                    createVideoAction.parameters.relatedFiles,
                    videoContext,
                ),
            );

            if (response.success) {
                displayStatus(
                    "Video generation request accepted...processing.",
                    videoContext,
                );
                result = createVideoPlaceHolder(response.data);
            } else {
                return createActionResultFromError(response.message);
            }
            break;
        default:
            throw new Error(`Unknown action: ${(action as any).actionName}`);
    }
    return result;
}

/**
 * Get inpainting items from the list of related files.
 * @param relatedFiles The list of related files (attachments) the user provided
 * @returns An array of inpainting items or undefined if no valid files are found
 */
async function getInPaintItems(
    relatedFiles?: string[],
    context?: ActionContext<VideoActionContext>,
): Promise<ImageInPaintItem[] | undefined> {
    if (relatedFiles === undefined || relatedFiles.length === 0) {
        return undefined;
    }

    return await Promise.all(
        relatedFiles.map(async (file) => {
            let a = await context!.sessionContext.sessionStorage?.read(
                `\\..\\user_files\\${file}`,
                "base64",
            );

            return {
                frame_index: 0,
                type: "image",
                file_name: file,
                crop_bounds: {
                    left_fraction: 0,
                    top_fraction: 0,
                    right_fraction: 1,
                    bottom_fraction: 1,
                },
                contents: a,
                mime_type: getMimeType(file.substring(file.indexOf("."))),
            };
        }),
    );
}

function createVideoPlaceHolder(
    videoJob: VideoGenerationJob,
): ActionResultSuccess {
    if (videoJob.endpoint === undefined) {
        return createActionResult(
            `Failed to generate the requested video. No endpoint returned.`,
        );
    }

    const statusUrl = `${videoJob.endpoint.origin}/openai/v1/videos/${videoJob.id}`;
    const hash: string = randomBytes(4).readUInt32LE(0).toString();
    const jScript: string = `
    <script>
    
        var ro = new ResizeObserver(entries => {
            for (let e of entries) {
                window.top.postMessage('aivideo_${hash}_' + document.documentElement.scrollHeight, '*');
            }
        });

        ro.observe(document.querySelector('#video_div_${hash}'));

        async function pollVideo_${hash}() {
            const container = document.getElementById("video_div_${hash}");
            const jobId = "${videoJob.id}";
            console.log("⏳ Polling job status for ID:", jobId);            
            
            let i = 1;
            let status = "";
            let statusData = undefined;
            while (status !== "completed" && status !== "failed") {
                await new Promise(resolve => setTimeout(resolve, 5000));
                const statusResponse = await fetch("${statusUrl}", { headers: ${JSON.stringify(videoJob.headers)} });

                if (!statusResponse.ok) {
                    // hide the generating graphic
                    container.previousElementSibling.style.display = 'none';

                    console.log("❌ Failed to get job status.");
                    container.innerText = "Failed to get job status. " + statusResponse.statusText;
                    return;
                }

                statusData = await statusResponse.json();
                console.log("Waiting..." + JSON.stringify(statusData, null, 2));
                status = statusData.status;
                container.previousElementSibling.children[1].innerHTML = "JobID - " + jobId.substr(0, 12) + "... Progress: " + statusData.progress + " Status: " + status + " " + (i++) * 5  + "s elapsed";
            }

            // hide the generating graphic
            container.previousElementSibling.style.display = 'none';

            if (status === "completed") {
                console.log("✅ Video generation succeeded.");
                const video_url = '${videoJob.endpoint.origin}/openai/v1/videos/${videoJob.id}/content?variant=video';
                const videoResponse = await fetch(video_url, { headers: ${JSON.stringify(videoJob.headers)} });
                if (videoResponse.ok) {
                    container.innerText = '';
                    const videoBlob = await videoResponse.blob();
                    const videoObjectURL = URL.createObjectURL(videoBlob);

                    // Create and configure video element
                    const videoElement = document.createElement("video");
                    videoElement.className = "ai-video";
                    videoElement.src = videoObjectURL;
                    videoElement.controls = true;
                    videoElement.width = 640;
                    videoElement.height = 360;
                    videoElement.autoplay = true;

                    // Append to container
                    container.appendChild(videoElement);
                    console.log("🎥 Video added to the page.");                        
                } else {
                    container.innerText = "❌ Failed to retrieve video content.";
                }
            } else {
                const div = document.createElement('div');
                div.textContent = "❌ Video generation failed: " + (statusData.failure_reason ?? "");
                container.appendChild(div);
                console.log(JSON.stringify(statusData, null, 2));
            }
        }
        
        pollVideo_${hash}();
    </script>
    `;

    return createActionResultFromHtmlDisplayWithScript(
        ` 
        <div style="loading-container">
            <div class="loading"><div class="loading-inner first"></div><div class="loading-inner second"></div><div class="loading-inner third"></div></div>
            <div class="generating">Generating</div>
        </div>          
        <div id="video_div_${hash}" class="ai-video-container"></div>` +
            jScript,
        "An AI generated video of '" + videoJob.prompt + "'",
    );
}
