import { Request, Response, NextFunction } from "express";
import { z } from "zod";
import { db, olms } from "@server/db";
import { clients, currentFingerprint } from "@server/db";
import { eq, and } from "drizzle-orm";
import response from "@server/lib/response";
import HttpCode from "@server/types/HttpCode";
import createHttpError from "http-errors";
import logger from "@server/logger";
import stoi from "@server/lib/stoi";
import { fromError } from "zod-validation-error";
import { OpenAPITags, registry } from "@server/openApi";
import { getUserDeviceName } from "@server/db/names";
import { build } from "@server/build";

const getClientSchema = z.strictObject({
    clientId: z
        .string()
        .optional()
        .transform(stoi)
        .pipe(z.int().positive().optional())
        .optional(),
    niceId: z.string().optional(),
    orgId: z.string().optional()
});

async function query(clientId?: number, niceId?: string, orgId?: string) {
    if (clientId) {
        const [res] = await db
            .select()
            .from(clients)
            .where(eq(clients.clientId, clientId))
            .leftJoin(olms, eq(clients.clientId, olms.clientId))
            .leftJoin(
                currentFingerprint,
                eq(olms.olmId, currentFingerprint.olmId)
            )
            .limit(1);
        return res;
    } else if (niceId && orgId) {
        const [res] = await db
            .select()
            .from(clients)
            .where(and(eq(clients.niceId, niceId), eq(clients.orgId, orgId)))
            .leftJoin(olms, eq(clients.clientId, olms.clientId))
            .leftJoin(
                currentFingerprint,
                eq(olms.olmId, currentFingerprint.olmId)
            )
            .limit(1);
        return res;
    }
}

type PostureData = {
    biometricsEnabled?: boolean | null;
    diskEncrypted?: boolean | null;
    firewallEnabled?: boolean | null;
    autoUpdatesEnabled?: boolean | null;
    tpmAvailable?: boolean | null;
    windowsAntivirusEnabled?: boolean | null;
    macosSipEnabled?: boolean | null;
    macosGatekeeperEnabled?: boolean | null;
    macosFirewallStealthMode?: boolean | null;
    linuxAppArmorEnabled?: boolean | null;
    linuxSELinuxEnabled?: boolean | null;
};

function getPlatformPostureData(
    platform: string | null | undefined,
    fingerprint: typeof currentFingerprint.$inferSelect | null
): PostureData | null {
    if (!fingerprint) return null;

    const normalizedPlatform = platform?.toLowerCase() || "unknown";
    const posture: PostureData = {};

    // Windows: Hard drive encryption, Firewall, Auto updates, TPM availability, Windows Antivirus status
    if (normalizedPlatform === "windows") {
        if (fingerprint.diskEncrypted !== null && fingerprint.diskEncrypted !== undefined) {
            posture.diskEncrypted = fingerprint.diskEncrypted;
        }
        if (fingerprint.firewallEnabled !== null && fingerprint.firewallEnabled !== undefined) {
            posture.firewallEnabled = fingerprint.firewallEnabled;
        }
        if (fingerprint.tpmAvailable !== null && fingerprint.tpmAvailable !== undefined) {
            posture.tpmAvailable = fingerprint.tpmAvailable;
        }
        if (fingerprint.windowsAntivirusEnabled !== null && fingerprint.windowsAntivirusEnabled !== undefined) {
            posture.windowsAntivirusEnabled = fingerprint.windowsAntivirusEnabled;
        }
    }
    // macOS: Hard drive encryption, Biometric configuration, Firewall, System Integrity Protection (SIP), Gatekeeper, Firewall stealth mode
    else if (normalizedPlatform === "macos") {
        if (fingerprint.diskEncrypted !== null && fingerprint.diskEncrypted !== undefined) {
            posture.diskEncrypted = fingerprint.diskEncrypted;
        }
        if (fingerprint.biometricsEnabled !== null && fingerprint.biometricsEnabled !== undefined) {
            posture.biometricsEnabled = fingerprint.biometricsEnabled;
        }
        if (fingerprint.firewallEnabled !== null && fingerprint.firewallEnabled !== undefined) {
            posture.firewallEnabled = fingerprint.firewallEnabled;
        }
        if (fingerprint.macosSipEnabled !== null && fingerprint.macosSipEnabled !== undefined) {
            posture.macosSipEnabled = fingerprint.macosSipEnabled;
        }
        if (fingerprint.macosGatekeeperEnabled !== null && fingerprint.macosGatekeeperEnabled !== undefined) {
            posture.macosGatekeeperEnabled = fingerprint.macosGatekeeperEnabled;
        }
        if (fingerprint.macosFirewallStealthMode !== null && fingerprint.macosFirewallStealthMode !== undefined) {
            posture.macosFirewallStealthMode = fingerprint.macosFirewallStealthMode;
        }
        if (fingerprint.autoUpdatesEnabled !== null && fingerprint.autoUpdatesEnabled !== undefined) {
            posture.autoUpdatesEnabled = fingerprint.autoUpdatesEnabled;
        }
    }
    // Linux: Hard drive encryption, Firewall, AppArmor, SELinux, TPM availability
    else if (normalizedPlatform === "linux") {
        if (fingerprint.diskEncrypted !== null && fingerprint.diskEncrypted !== undefined) {
            posture.diskEncrypted = fingerprint.diskEncrypted;
        }
        if (fingerprint.firewallEnabled !== null && fingerprint.firewallEnabled !== undefined) {
            posture.firewallEnabled = fingerprint.firewallEnabled;
        }
        if (fingerprint.linuxAppArmorEnabled !== null && fingerprint.linuxAppArmorEnabled !== undefined) {
            posture.linuxAppArmorEnabled = fingerprint.linuxAppArmorEnabled;
        }
        if (fingerprint.linuxSELinuxEnabled !== null && fingerprint.linuxSELinuxEnabled !== undefined) {
            posture.linuxSELinuxEnabled = fingerprint.linuxSELinuxEnabled;
        }
        if (fingerprint.tpmAvailable !== null && fingerprint.tpmAvailable !== undefined) {
            posture.tpmAvailable = fingerprint.tpmAvailable;
        }
    }
    // iOS: Biometric configuration
    else if (normalizedPlatform === "ios") {
        if (fingerprint.biometricsEnabled !== null && fingerprint.biometricsEnabled !== undefined) {
            posture.biometricsEnabled = fingerprint.biometricsEnabled;
        }
    }
    // Android: Screen lock, Biometric configuration, Hard drive encryption
    else if (normalizedPlatform === "android") {
        if (fingerprint.diskEncrypted !== null && fingerprint.diskEncrypted !== undefined) {
            posture.diskEncrypted = fingerprint.diskEncrypted;
        }
    }

    // Only return if we have at least one posture field
    return Object.keys(posture).length > 0 ? posture : null;
}

export type GetClientResponse = NonNullable<
    Awaited<ReturnType<typeof query>>
>["clients"] & {
    olmId: string | null;
    agent: string | null;
    olmVersion: string | null;
    fingerprint: {
        username: string | null;
        hostname: string | null;
        platform: string | null;
        osVersion: string | null;
        kernelVersion: string | null;
        arch: string | null;
        deviceModel: string | null;
        serialNumber: string | null;
        firstSeen: number | null;
        lastSeen: number | null;
    } | null;
    posture: PostureData | null;
};

registry.registerPath({
    method: "get",
    path: "/org/{orgId}/client/{niceId}",
    description:
        "Get a client by orgId and niceId. NiceId is a readable ID for the site and unique on a per org basis.",
    tags: [OpenAPITags.Org, OpenAPITags.Site],
    request: {
        params: z.object({
            orgId: z.string(),
            niceId: z.string()
        })
    },
    responses: {}
});

registry.registerPath({
    method: "get",
    path: "/client/{clientId}",
    description: "Get a client by its client ID.",
    tags: [OpenAPITags.Client],
    request: {
        params: z.object({
            clientId: z.number()
        })
    },
    responses: {}
});

export async function getClient(
    req: Request,
    res: Response,
    next: NextFunction
): Promise<any> {
    try {
        const parsedParams = getClientSchema.safeParse(req.params);
        if (!parsedParams.success) {
            logger.error(
                `Error parsing params: ${fromError(parsedParams.error).toString()}`
            );
            return next(
                createHttpError(
                    HttpCode.BAD_REQUEST,
                    fromError(parsedParams.error).toString()
                )
            );
        }

        const { clientId, niceId, orgId } = parsedParams.data;

        const client = await query(clientId, niceId, orgId);

        if (!client) {
            return next(
                createHttpError(HttpCode.NOT_FOUND, "Client not found")
            );
        }

        // Replace name with device name if OLM exists
        let clientName = client.clients.name;
        if (client.olms) {
            const model = client.currentFingerprint?.deviceModel || null;
            clientName = getUserDeviceName(model, client.clients.name);
        }

        // Build fingerprint data if available
        const fingerprintData = client.currentFingerprint
            ? {
                username: client.currentFingerprint.username || null,
                hostname: client.currentFingerprint.hostname || null,
                platform: client.currentFingerprint.platform || null,
                osVersion: client.currentFingerprint.osVersion || null,
                kernelVersion:
                    client.currentFingerprint.kernelVersion || null,
                arch: client.currentFingerprint.arch || null,
                deviceModel: client.currentFingerprint.deviceModel || null,
                serialNumber: client.currentFingerprint.serialNumber || null,
                firstSeen: client.currentFingerprint.firstSeen || null,
                lastSeen: client.currentFingerprint.lastSeen || null
            }
            : null;

        // Build posture data if available (platform-specific)
        let postureData: PostureData | null = null;
        if (build !== "oss") {
            postureData = getPlatformPostureData(
                client.currentFingerprint?.platform || null,
                client.currentFingerprint
            );
        }

        const data: GetClientResponse = {
            ...client.clients,
            name: clientName,
            olmId: client.olms ? client.olms.olmId : null,
            agent: client.olms?.agent || null,
            olmVersion: client.olms?.version || null,
            fingerprint: fingerprintData,
            posture: postureData
        };

        return response<GetClientResponse>(res, {
            data,
            success: true,
            error: false,
            message: "Client retrieved successfully",
            status: HttpCode.OK
        });
    } catch (error) {
        logger.error(error);
        return next(
            createHttpError(HttpCode.INTERNAL_SERVER_ERROR, "An error occurred")
        );
    }
}