import { sendToClient } from "#dynamic/routers/ws";
import { S } from "@faker-js/faker/dist/airline-Dz1uGqgJ";
import { db, newts, olms, Transaction } from "@server/db";
import {
    Alias,
    convertSubnetProxyTargetsV2ToV1,
    SubnetProxyTarget,
    SubnetProxyTargetV2
} from "@server/lib/ip";
import logger from "@server/logger";
import { eq } from "drizzle-orm";
import semver from "semver";

const BATCH_SIZE = 50;
const BATCH_DELAY_MS = 50;

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

function chunkArray<T>(array: T[], size: number): T[][] {
    const chunks: T[][] = [];
    for (let i = 0; i < array.length; i += size) {
        chunks.push(array.slice(i, i + size));
    }
    return chunks;
}

const NEWT_V2_TARGETS_VERSION = ">=1.11.0";

export async function convertTargetsIfNessicary(
    newtId: string,
    targets: SubnetProxyTarget[] | SubnetProxyTargetV2[]
) {
    // get the newt
    const [newt] = await db
        .select()
        .from(newts)
        .where(eq(newts.newtId, newtId));
    if (!newt) {
        throw new Error(`No newt found for id: ${newtId}`);
    }

    // check the semver
    if (
        newt.version &&
        !semver.satisfies(newt.version, NEWT_V2_TARGETS_VERSION)
    ) {
        logger.debug(
            `addTargets Newt version ${newt.version} does not support targets v2 falling back`
        );
        targets = convertSubnetProxyTargetsV2ToV1(
            targets as SubnetProxyTargetV2[]
        );
    }

    return targets;
}

export async function addTargets(
    newtId: string,
    targets: SubnetProxyTarget[] | SubnetProxyTargetV2[]
) {
    targets = await convertTargetsIfNessicary(newtId, targets);

    const batches = chunkArray<SubnetProxyTarget | SubnetProxyTargetV2>(
        targets,
        BATCH_SIZE
    );

    for (let i = 0; i < batches.length; i++) {
        if (i > 0) {
            await sleep(BATCH_DELAY_MS);
        }
        await sendToClient(
            newtId,
            {
                type: `newt/wg/targets/add`,
                data: batches[i]
            },
            { incrementConfigVersion: true }
        );
    }
}

export async function removeTargets(
    newtId: string,
    targets: SubnetProxyTarget[] | SubnetProxyTargetV2[]
) {
    targets = await convertTargetsIfNessicary(newtId, targets);

    const batches = chunkArray<SubnetProxyTarget | SubnetProxyTargetV2>(
        targets,
        BATCH_SIZE
    );
    for (let i = 0; i < batches.length; i++) {
        if (i > 0) {
            await sleep(BATCH_DELAY_MS);
        }
        await sendToClient(
            newtId,
            {
                type: `newt/wg/targets/remove`,
                data: batches[i]
            },
            { incrementConfigVersion: true }
        );
    }
}

export async function updateTargets(
    newtId: string,
    targets: {
        oldTargets: SubnetProxyTarget[] | SubnetProxyTargetV2[];
        newTargets: SubnetProxyTarget[] | SubnetProxyTargetV2[];
    }
) {
    // get the newt
    const [newt] = await db
        .select()
        .from(newts)
        .where(eq(newts.newtId, newtId));
    if (!newt) {
        logger.error(`addTargetsL No newt found for id: ${newtId}`);
        return;
    }

    // check the semver
    if (
        newt.version &&
        !semver.satisfies(newt.version, NEWT_V2_TARGETS_VERSION)
    ) {
        logger.debug(
            `addTargets Newt version ${newt.version} does not support targets v2 falling back`
        );
        targets = {
            oldTargets: convertSubnetProxyTargetsV2ToV1(
                targets.oldTargets as SubnetProxyTargetV2[]
            ),
            newTargets: convertSubnetProxyTargetsV2ToV1(
                targets.newTargets as SubnetProxyTargetV2[]
            )
        };
    }

    const oldBatches = chunkArray<SubnetProxyTarget | SubnetProxyTargetV2>(
        targets.oldTargets,
        BATCH_SIZE
    );
    const newBatches = chunkArray<SubnetProxyTarget | SubnetProxyTargetV2>(
        targets.newTargets,
        BATCH_SIZE
    );

    const maxBatches = Math.max(oldBatches.length, newBatches.length);

    for (let i = 0; i < maxBatches; i++) {
        if (i > 0) {
            await sleep(BATCH_DELAY_MS);
        }
        await sendToClient(
            newtId,
            {
                type: `newt/wg/targets/update`,
                data: {
                    oldTargets: oldBatches[i] || [],
                    newTargets: newBatches[i] || []
                }
            },
            { incrementConfigVersion: true }
        ).catch((error) => {
            logger.warn(`Error sending message:`, error);
        });
    }
}

export async function addPeerData(
    clientId: number,
    siteId: number,
    remoteSubnets: string[],
    aliases: Alias[],
    olmId?: string
) {
    if (!olmId) {
        const [olm] = await db
            .select()
            .from(olms)
            .where(eq(olms.clientId, clientId))
            .limit(1);
        if (!olm) {
            return; // ignore this because an olm might not be associated with the client anymore
        }
        olmId = olm.olmId;
    }

    await sendToClient(
        olmId,
        {
            type: `olm/wg/peer/data/add`,
            data: {
                siteId: siteId,
                remoteSubnets: remoteSubnets,
                aliases: aliases
            }
        },
        { incrementConfigVersion: true }
    ).catch((error) => {
        logger.warn(`Error sending message:`, error);
    });
}

export async function removePeerData(
    clientId: number,
    siteId: number,
    remoteSubnets: string[],
    aliases: Alias[],
    olmId?: string
) {
    if (!olmId) {
        const [olm] = await db
            .select()
            .from(olms)
            .where(eq(olms.clientId, clientId))
            .limit(1);
        if (!olm) {
            return;
        }
        olmId = olm.olmId;
    }

    await sendToClient(
        olmId,
        {
            type: `olm/wg/peer/data/remove`,
            data: {
                siteId: siteId,
                remoteSubnets: remoteSubnets,
                aliases: aliases
            }
        },
        { incrementConfigVersion: true }
    ).catch((error) => {
        logger.warn(`Error sending message:`, error);
    });
}

export async function updatePeerData(
    clientId: number,
    siteId: number,
    remoteSubnets:
        | {
              oldRemoteSubnets: string[];
              newRemoteSubnets: string[];
          }
        | undefined,
    aliases:
        | {
              oldAliases: Alias[];
              newAliases: Alias[];
          }
        | undefined,
    olmId?: string
) {
    if (!olmId) {
        const [olm] = await db
            .select()
            .from(olms)
            .where(eq(olms.clientId, clientId))
            .limit(1);
        if (!olm) {
            return;
        }
        olmId = olm.olmId;
    }

    await sendToClient(
        olmId,
        {
            type: `olm/wg/peer/data/update`,
            data: {
                siteId: siteId,
                ...remoteSubnets,
                ...aliases
            }
        },
        { incrementConfigVersion: true }
    ).catch((error) => {
        logger.warn(`Error sending message:`, error);
    });
}