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

import { Storage } from "@typeagent/agent-sdk";
import { getBlob } from "aiclient";
import ExifReader from "exifreader";
import {
    MultimodalPromptContent,
    PromptSection,
    TextPromptContent,
} from "typechat";
import {
    exifGPSTagToLatLong,
    findNearbyPointsOfInterest,
    PointOfInterest,
    reverseGeocode,
    ReverseGeocodeAddressLookup,
} from "./location.js";
import { openai } from "aiclient";
import fs from "node:fs";
import path from "node:path";
import { parse } from "date-fns";

export class CachedImageWithDetails {
    constructor(
        public exifTags: ExifReader.Tags | undefined,
        public storageLocation: string,
        public image: string,
    ) {}
}

export type ImagePromptDetails = {
    promptSection?: PromptSection | undefined;
    nearbyPOI?: PointOfInterest[] | undefined;
    reverseGeocode?: ReverseGeocodeAddressLookup[] | undefined;
};

export function getImageElement(imgData: string): string {
    return `<img class="chat-input-image" src="${imgData}" />`;
}

export function extractRelevantExifTags(exifTags: ExifReader.Tags | undefined) {
    let tags: string = "";

    if (exifTags) {
        tags = `${exifTags.Make ? "Make: " + exifTags.Make.value : ""}
        ${exifTags.Model ? "Model: " + exifTags.Model.value : ""}
        ${exifTags.DateTime ? "Date Taken: " + exifTags.DateTime.value : ""}
        ${exifTags.OffsetTime ? "Offset Time: " + exifTags.OffsetTime.value : ""}
        ${exifTags.GPSLatitude ? "GPS Latitude: " + exifTags.GPSLatitude.description : ""}
        ${exifTags.GPSLatitudeRef ? "GPS Latitude Reference: " + exifTags.GPSLatitudeRef.value : ""}
        ${exifTags.GPSLongitude ? "GPS Longitude Reference: " + exifTags.GPSLongitude.description : ""}
        ${exifTags.GPSLongitudeRef ? "GPS Longitude Reference: " + exifTags.GPSLongitudeRef?.value : ""}
        ${exifTags.GPSAltitudeRef ? "GPS Altitude Reference: " + exifTags.GPSAltitudeRef.value : ""}
        ${exifTags.GPSAltitude ? "GPS Altitude: " + exifTags.GPSAltitude.description : ""}
        ${exifTags.Orientation ? "Orientation: " + exifTags.Orientation.description : ""}
        `;
        console.log(tags.replace("\n\n", "\n"));
    }
    return tags;
}

export function extractAllExifTags(exifTags: ExifReader.Tags) {
    let tags: string = "";

    for (const key of Object.keys(exifTags)) {
        if (exifTags[key].description) {
            tags += `${key}: ${exifTags[key].description}\n`;
        }
    }

    return tags;
}

/**
 * Downloads the supplied uri and saves it to local session storage
 * @param uri The uri of the image to download
 * @param fileName The name of the file to save the image locally as (including relative path)
 */
export async function downloadImage(
    uri: string,
    fileName: string,
    storage: Storage,
): Promise<boolean> {
    return new Promise<boolean>(async (resolve) => {
        // save the generated image in the session store
        const blobResponse = await getBlob(uri);
        if (blobResponse.success) {
            const ab = Buffer.from(await blobResponse.data.arrayBuffer());

            storage.write(fileName, ab);

            resolve(true);
        }

        resolve(false);
    });
}

/**
 * Adds the supplied image to the suppled prompt section.
 * @param role - The role of this prompt section.
 * @param image - The image to adding to the prompt section.
 * @param includeFileName - Flag indicating if the file name should be included in the prompt.
 * @param includePartialExifTags - Flag indicating if EXIF tags should be included.
 * @param includeAllExifTags - Flag to indicate of all EXIF tags should be included.  Supercedes previous parameter.
 * @param includePOI  - Flag indicating if POI should be located and appended to the prompt.
 * @param includeGeocodedAddress - Flag indicating if the image location should be geocoded if it's available.
 * @returns - A prompt section representing the supplied image and related details as requested.
 */
export async function addImagePromptContent(
    role: "system" | "user" | "assistant",
    image: CachedImageWithDetails,
    includeFileName?: boolean,
    includePartialExifTags?: boolean,
    includeAllExifTags?: boolean,
    includePOI?: boolean,
    includeGeocodedAddress?: boolean,
): Promise<ImagePromptDetails> {
    const content: MultimodalPromptContent[] = [];
    const retValue: ImagePromptDetails = {};

    // add the image to the prompt
    content.push({
        type: "image_url",
        image_url: {
            url: image.image,
            detail: "high",
        },
    });

    // include the file name in the prompt?
    if (includeFileName !== false) {
        content.push({
            type: "text",
            text: `File Name: ${image.storageLocation}`,
        } as TextPromptContent);
    }

    // include exif tags?
    if (includeAllExifTags === true && image.exifTags) {
        content.push({
            type: "text",
            text: `Image EXIF tags: \n${extractAllExifTags(image.exifTags)}`,
        });
    } else if (includePartialExifTags === true && image.exifTags) {
        content.push({
            type: "text",
            text: `Image EXIF tags: \n${extractRelevantExifTags(image.exifTags)}`,
        });
    }

    // include POI
    if (image.exifTags) {
        retValue.nearbyPOI = await findNearbyPointsOfInterest(
            exifGPSTagToLatLong(
                image.exifTags.GPSLatitude,
                image.exifTags.GPSLatitudeRef,
                image.exifTags.GPSLongitude,
                image.exifTags.GPSLongitudeRef,
            ),
            openai.apiSettingsFromEnv(),
        );
    }
    if (includePOI !== false) {
        content.push({
            type: "text",
            text: `Nearby Points of Interest: \n${JSON.stringify(retValue.nearbyPOI)}`,
        });
    }

    // include address
    if (image.exifTags) {
        retValue.reverseGeocode = await reverseGeocode(
            exifGPSTagToLatLong(
                image.exifTags.GPSLatitude,
                image.exifTags.GPSLatitudeRef,
                image.exifTags.GPSLongitude,
                image.exifTags.GPSLongitudeRef,
            ),
            openai.apiSettingsFromEnv(),
        );
    }

    if (includeGeocodedAddress !== false) {
        content.push({
            type: "text",
            text: `Reverse Geocode Results: \n${JSON.stringify(retValue.reverseGeocode)}`,
        });
    }

    // set content
    retValue.promptSection = { role: role, content: content };

    return retValue;
}

/**
 * Tries to get the date the image was taken.
 * It attempts to use the filename and falls back to Exif tags.
 *
 * @param path The path to the image file whose taken date is to be ascertained
 * @returns either the date.  If the date is undeterimined returns 1/1/1900 00:00:00
 */
export function getDateTakenFuzzy(filePath: string): Date {
    const fileName: string = path.basename(filePath).toLowerCase();
    let datePart: string = fileName.substring(0, fileName.indexOf("."));
    if (fileName.startsWith("img_")) {
        datePart = fileName.substring(5);
    }

    let retValue: Date = new Date("1/1/1900 00:00:00");
    if (datePart.length != 15) {
        const buffer: Buffer = fs.readFileSync(filePath);
        const tags: ExifReader.Tags = ExifReader.load(buffer);

        // Try to get the date time from the exif tags
        if (tags.DateTime?.description) {
            retValue = parse(
                tags.DateTime.description,
                "yyyy:MM:dd hh:mm:ss",
                new Date(),
            );
        }
    } else {
        retValue.setFullYear(
            parseInt(datePart.substring(0, 4)),
            parseInt(datePart.substring(4, 6)) - 1,
            parseInt(datePart.substring(6, 8)),
        );

        retValue.setHours(
            parseInt(datePart.substring(9, 11)),
            parseInt(datePart.substring(11, 13)),
            parseInt(datePart.substring(13, 15)),
        );
    }

    return retValue;
}
