import { writable } from "svelte/store"
import type { LatLngExpression } from "leaflet";
import L from "leaflet";

import { getCsrfToken } from "./auth";


interface TrajectoryPoint {
    altitude: number;
    datetime: string;
    latitude: number;
    longitude: number;
}

interface PredictionStage {
    stage: string;
    trajectory: TrajectoryPoint[];
}

interface ParsedPrediction {
    flight_path: [number, number, number][];
    launch: {
        latlng: LatLngExpression;
        datetime: Date;
    };
    burst: {
        latlng: LatLngExpression;
        datetime: Date;
    };
    landing: {
        latlng: LatLngExpression;
        datetime: Date;
    };
    profile: string;
    flight_time: number;
}


export const latestPrediction = writable({
    metadata: {
        complete_datetime: "",
        start_datetime: ""
    },
    prediction: [
        {
        stage: "",
        trajectory: [
            {
            altitude: 0.0,
            datetime: "",
            latitude: 0.0,
            longitude: 0.0
            }
        ]
        }
    ]
});

export const latestPredictionParsed = writable({} as ParsedPrediction);

function getLatestDataset() {
    const now = new Date();
    const hours = now.getUTCHours();
    const minutes = now.getUTCMinutes();
    const seconds = now.getUTCSeconds();

    // Round down to the nearest 6-hour interval
    const roundedHours = Math.floor(hours / 6) * 6;
    const roundedDate = new Date(now);
    roundedDate.setUTCHours(roundedHours, 0, 0, 0);

    // Subtract 6 hours to account for the lag
    roundedDate.setUTCHours(roundedDate.getUTCHours() - 6);

    return roundedDate.toISOString(); 
}

function formatLaunchDateTime(dateObj: string | Date, timeStr: string): string {
    // Ensure date is a Date object
    const date = new Date(dateObj);
    
    // Extract date components
    const year = date.getFullYear();
    const month = String(date.getMonth() + 1).padStart(2, '0');
    const day = String(date.getDate()).padStart(2, '0');

    // Format time (ensure it has seconds)
    let formattedTime = timeStr;
    if (timeStr.split(':').length === 2) {
        formattedTime += ':00'; // Add seconds if missing
    }

    // Combine into ISO string
    const isoString = new Date(`${year}-${month}-${day}T${formattedTime}Z`).toISOString();

    return isoString;
}

export const getForecast = async (flightParameters: Record<string, any>, startDate: string, startTime: string): Promise<void> => {
    const launch_datetime = formatLaunchDateTime(startDate, startTime);

    // Create request object
    flightParameters.dataset = getLatestDataset();
    flightParameters.launch_datetime = launch_datetime;

    console.log("Sending request:", flightParameters);

    try {
        // Example POST request - replace with your actual API endpoint
        const csrfToken = await getCsrfToken();
        if (!csrfToken) {
            throw new Error('CSRF token not found');
        }

        const response = await fetch('http://localhost:8000/api/predictions', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'X-CSRFToken': csrfToken
            },
            body: JSON.stringify(flightParameters),
            credentials: 'include'
        });

        if (!response.ok) {
            throw new Error(`HTTP error! status: ${response.status}`);
        }

        const data = await response.json();
        console.log("Forecast response:", data);

        latestPrediction.set(data.result);
        latestPredictionParsed.set(parsePrediction(data.result.prediction));

        alert("Forecast request successful!");
    // Handle the response data as needed
    } catch (error) {
        console.error("Error sending forecast request:", error);
        alert("Error getting forecast: " + error);
    }
};

export function parsePrediction(prediction: PredictionStage[]): ParsedPrediction {
    const flight_path: [number, number, number][] = [];
    const launch: { latlng: LatLngExpression; datetime: Date } = {} as any;
    const burst: { latlng: LatLngExpression; datetime: Date } = {} as any;
    const landing: { latlng: LatLngExpression; datetime: Date } = {} as any;

    const ascent = prediction[0].trajectory;
    const descent = prediction[1].trajectory;

    // Add the ascent track to the flight path array.
    ascent.forEach((item) => {
        let lon = item.longitude;
        if (lon > 180.0) {
            lon -= 360.0;
        }

        flight_path.push([item.latitude, lon, item.altitude]);
    });

    // Add the descent track to the flight path array.
    descent.forEach((item) => {
        let lon = item.longitude;
        if (lon > 180.0) {
            lon -= 360.0;
        }

        flight_path.push([item.latitude, lon, item.altitude]);
    });

    // Populate the launch, burst, and landing points
    const launchObj = ascent[0];
    let lon = launchObj.longitude;
    if (lon > 180.0) {
        lon -= 360.0;
    }
    launch.latlng = L.latLng([launchObj.latitude, lon, launchObj.altitude]);
    launch.datetime = new Date(launchObj.datetime);

    const burstObj = descent[0];
    lon = burstObj.longitude;
    if (lon > 180.0) {
        lon -= 360.0;
    }
    burst.latlng = L.latLng([burstObj.latitude, lon, burstObj.altitude]);
    burst.datetime = new Date(burstObj.datetime);

    const landingObj = descent[descent.length - 1];
    lon = landingObj.longitude;
    if (lon > 180.0) {
        lon -= 360.0;
    }
    landing.latlng = L.latLng([landingObj.latitude, lon, landingObj.altitude]);
    landing.datetime = new Date(landingObj.datetime);

    const profile = prediction[1].stage === "descent" ? "standard_profile" : "float_profile";
    const flight_time = (new Date(landing.datetime).getTime() - new Date(launch.datetime).getTime()) / 1000;

    return {
        flight_path,
        launch,
        burst,
        landing,
        profile,
        flight_time,
    };
}