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

import {
    ArgDef,
    CommandHandler,
    CommandMetadata,
    InteractiveIo,
    NamedArgs,
    parseNamedArguments,
    StopWatch,
} from "interactive-app";
import {
    ChatContext,
    Models,
    ReservedConversationNames,
} from "./chatMemory.js";
import {
    argDestFile,
    argSourceFileOrFolder,
    argSourceFolder,
} from "./common.js";
import { ensureDir, isDirectoryPath } from "typeagent";
import fs from "node:fs";
import * as knowLib from "knowledge-processor";
import path from "node:path";
import { sqlite } from "memory-providers";
import { isImageFileType } from "common-utils";
import { TokenCounter, openai } from "aiclient";

type CompletionUsageStats = openai.CompletionUsageStats;

export async function createImageMemory(
    models: Models,
    storePath: string,
    settings: knowLib.conversation.ConversationSettings,
    useSqlite: boolean = false,
    createNew: boolean = false,
) {
    const imageSettings: knowLib.conversation.ConversationSettings = {
        ...settings,
    };
    if (models.embeddingModelSmall) {
        imageSettings.entityIndexSettings = {
            ...settings.indexSettings,
        };
        imageSettings.entityIndexSettings.embeddingModel =
            models.embeddingModelSmall;
        imageSettings.actionIndexSettings = {
            ...settings.indexSettings,
        };
        imageSettings.actionIndexSettings.embeddingModel =
            models.embeddingModelSmall;
    }
    const imageStorePath = path.join(
        storePath,
        ReservedConversationNames.images,
    );
    await ensureDir(imageStorePath);
    const storage = useSqlite
        ? await sqlite.createStorageDb(imageStorePath, "images.db", createNew)
        : undefined;

    const memory = await knowLib.image.createImageMemory(
        models.chatModel,
        models.answerModel,
        ReservedConversationNames.images,
        storePath,
        imageSettings,
        storage,
    );
    memory.searchProcessor.answers.settings.chunking.fastStop = true;
    return memory;
}

export function argPause(defaultValue = 0): ArgDef {
    return {
        type: "number",
        defaultValue,
        description: "Pause for given milliseconds after each iteration",
    };
}

export function importImageDef(): CommandMetadata {
    return {
        description: "Imports an image or set of images in a folder",
        args: {
            sourcePath: argSourceFileOrFolder(),
        },
        options: {
            pauseMs: argPause(),
        },
    };
}

export function buildImageCountHistogramDef(): CommandMetadata {
    return {
        description:
            "Builds a time series histogram from images in the supplied folder",
        args: {
            sourcePath: argSourceFolder(),
        },
        options: {
            destPath: argDestFile(),
        },
    };
}

export function createImageCommands(
    context: ChatContext,
    commands: Record<string, CommandHandler>,
): void {
    commands.importImage = importImage;
    commands.importImage.metadata = importImageDef();
    commands.buildImageCountHistogram = buildImageCountHistogram;
    commands.buildImageCountHistogram.metadata = buildImageCountHistogramDef();

    async function importImage(args: string[], io: InteractiveIo) {
        const namedArgs = parseNamedArguments(args, importImageDef());
        let sourcePath: string = namedArgs.sourcePath;
        let isDir = isDirectoryPath(sourcePath);

        if (!fs.existsSync(sourcePath)) {
            console.log(
                `The supplied file or folder '${sourcePath}' does not exist.`,
            );
            return;
        }

        const clock: StopWatch = new StopWatch();
        const tokenCountStart: CompletionUsageStats =
            TokenCounter.getInstance().total;

        if (isDir) {
            await indexImages(namedArgs, sourcePath, context, clock);
        } else {
            await indexImage(sourcePath, context);
        }

        const tokenCountFinish: CompletionUsageStats =
            TokenCounter.getInstance().total;

        clock.stop();
        console.log(`Total Duration: ${clock.elapsedSeconds} seconds`);
        console.log(
            `Prompt Token Consupmtion: ${tokenCountFinish.prompt_tokens - tokenCountStart.prompt_tokens}`,
        );
        console.log(
            `Completion Token Consupmtion: ${tokenCountFinish.completion_tokens - tokenCountStart.completion_tokens}`,
        );
        console.log(
            `Total Tokens: ${tokenCountFinish.total_tokens - tokenCountStart.total_tokens}`,
        );
    }

    async function buildImageCountHistogram(args: string[], io: InteractiveIo) {
        const namedArgs = parseNamedArguments(args, importImageDef());
        let sourcePath: string = namedArgs.sourcePath;

        knowLib.image.buildImageCountHistogram(sourcePath);
    }

    async function indexImages(
        namesArgs: NamedArgs,
        sourcePath: string,
        context: ChatContext,
        clock: StopWatch,
    ) {
        // load files from directory
        const fileNames = await fs.promises.readdir(sourcePath, {
            recursive: true,
        });

        // index each image
        for (let i = 0; i < fileNames.length; i++) {
            const fullFilePath: string = path.join(sourcePath, fileNames[i]);
            console.log(
                `${fullFilePath} [${i + 1} of ${fileNames.length}] (estimated time remaining: ${(clock.elapsedSeconds / (i + 1)) * (fileNames.length - i)})`,
            );
            await indexImage(fullFilePath, context);
        }
    }

    async function indexImage(fileName: string, context: ChatContext) {
        if (!fs.existsSync(fileName)) {
            console.log(`Could not find part of the file path '${fileName}'`);
            return;
        } else if (!isImageFileType(path.extname(fileName))) {
            console.log(`Skipping '${fileName}', not a known image file.`);
            return;
        }

        // load the image
        const image: knowLib.image.Image | undefined =
            await knowLib.image.loadImage(fileName, context.models.chatModel);

        if (image) {
            await knowLib.image.addImageToConversation(
                context.imageMemory,
                image,
                context.maxCharsPerChunk,
                context.conversationManager.knowledgeExtractor,
            );
        }
    }
}
