import { Request, Response, NextFunction } from "express";
import { z } from "zod";
import { db, newts, roleResources, roles, roleSiteResources } from "@server/db";
import { siteResources, sites, orgs, SiteResource } from "@server/db";
import response from "@server/lib/response";
import HttpCode from "@server/types/HttpCode";
import createHttpError from "http-errors";
import { eq, and } from "drizzle-orm";
import { fromError } from "zod-validation-error";
import logger from "@server/logger";
import { OpenAPITags, registry } from "@server/openApi";
import { addTargets } from "../client/targets";
import { getUniqueSiteResourceName } from "@server/db/names";
import { rebuildSiteClientAssociations } from "@server/lib/rebuildSiteClientAssociations";

const createSiteResourceParamsSchema = z
    .object({
        siteId: z.string().transform(Number).pipe(z.number().int().positive()),
        orgId: z.string()
    })
    .strict();

const createSiteResourceSchema = z
    .object({
        name: z.string().min(1).max(255),
        mode: z.enum(["host", "cidr", "port"]),
        protocol: z.enum(["tcp", "udp"]).optional(),
        proxyPort: z.number().int().positive().optional(),
        destinationPort: z.number().int().positive().optional(),
        destination: z.string().min(1),
        enabled: z.boolean().default(true),
        alias: z.string().optional()
    })
    .strict()
    .refine(
        (data) => {
            if (data.mode === "port") {
                return (
                    data.protocol !== undefined &&
                    data.proxyPort !== undefined &&
                    data.destinationPort !== undefined
                );
            }
            return true;
        },
        {
            message:
                "Protocol, proxy port, and destination port are required for port mode"
        }
    );

export type CreateSiteResourceBody = z.infer<typeof createSiteResourceSchema>;
export type CreateSiteResourceResponse = SiteResource;

registry.registerPath({
    method: "put",
    path: "/org/{orgId}/site/{siteId}/resource",
    description: "Create a new site resource.",
    tags: [OpenAPITags.Client, OpenAPITags.Org],
    request: {
        params: createSiteResourceParamsSchema,
        body: {
            content: {
                "application/json": {
                    schema: createSiteResourceSchema
                }
            }
        }
    },
    responses: {}
});

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

        const parsedBody = createSiteResourceSchema.safeParse(req.body);
        if (!parsedBody.success) {
            return next(
                createHttpError(
                    HttpCode.BAD_REQUEST,
                    fromError(parsedBody.error).toString()
                )
            );
        }

        const { siteId, orgId } = parsedParams.data;
        const {
            name,
            mode,
            protocol,
            proxyPort,
            destinationPort,
            destination,
            enabled,
            alias
        } = parsedBody.data;

        // Verify the site exists and belongs to the org
        const [site] = await db
            .select()
            .from(sites)
            .where(and(eq(sites.siteId, siteId), eq(sites.orgId, orgId)))
            .limit(1);

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

        // check if resource with same protocol and proxy port already exists (only for port mode)
        if (mode === "port" && protocol && proxyPort) {
            const [existingResource] = await db
                .select()
                .from(siteResources)
                .where(
                    and(
                        eq(siteResources.siteId, siteId),
                        eq(siteResources.orgId, orgId),
                        eq(siteResources.protocol, protocol),
                        eq(siteResources.proxyPort, proxyPort)
                    )
                )
                .limit(1);
            if (existingResource && existingResource.siteResourceId) {
                return next(
                    createHttpError(
                        HttpCode.CONFLICT,
                        "A resource with the same protocol and proxy port already exists"
                    )
                );
            }
        }

        const niceId = await getUniqueSiteResourceName(orgId);

        let newSiteResource: SiteResource | undefined;
        await db.transaction(async (trx) => {
            // Create the site resource
            [newSiteResource] = await trx
                .insert(siteResources)
                .values({
                    siteId,
                    niceId,
                    orgId,
                    name,
                    mode,
                    protocol: mode === "port" ? protocol : null,
                    proxyPort: mode === "port" ? proxyPort : null,
                    destinationPort: mode === "port" ? destinationPort : null,
                    destination,
                    enabled,
                    alias: alias || null
                })
                .returning();

            const [adminRole] = await trx
                .select()
                .from(roles)
                .where(and(eq(roles.isAdmin, true), eq(roles.orgId, orgId)))
                .limit(1);

            if (!adminRole) {
                return next(
                    createHttpError(HttpCode.NOT_FOUND, `Admin role not found`)
                );
            }

            await trx.insert(roleSiteResources).values({
                roleId: adminRole.roleId,
                siteResourceId: newSiteResource.siteResourceId
            });

            // Only add targets for port mode
            if (mode === "port" && protocol && proxyPort && destinationPort) {
                const [newt] = await trx
                    .select()
                    .from(newts)
                    .where(eq(newts.siteId, site.siteId))
                    .limit(1);

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

                await addTargets(
                    newt.newtId,
                    destination,
                    destinationPort,
                    protocol,
                    proxyPort
                );
            }

            await rebuildSiteClientAssociations(newSiteResource, trx); // we need to call this because we added to the admin role
        });

        if (!newSiteResource) {
            return next(
                createHttpError(
                    HttpCode.INTERNAL_SERVER_ERROR,
                    "Site resource creation failed"
                )
            );
        }

        logger.info(
            `Created site resource ${newSiteResource.siteResourceId} for site ${siteId}`
        );

        return response(res, {
            data: newSiteResource,
            success: true,
            error: false,
            message: "Site resource created successfully",
            status: HttpCode.CREATED
        });
    } catch (error) {
        logger.error("Error creating site resource:", error);
        return next(
            createHttpError(
                HttpCode.INTERNAL_SERVER_ERROR,
                "Failed to create site resource"
            )
        );
    }
}