import { db, requestAuditLog, resources } from "@server/db";
import { registry } from "@server/openApi";
import { NextFunction } from "express";
import { Request, Response } from "express";
import { eq, gt, lt, and, count, sql } from "drizzle-orm";
import { OpenAPITags } from "@server/openApi";
import { z } from "zod";
import createHttpError from "http-errors";
import HttpCode from "@server/types/HttpCode";
import { fromError } from "zod-validation-error";
import response from "@server/lib/response";
import logger from "@server/logger";

const queryAccessAuditLogsQuery = z.object({
    // iso string just validate its a parseable date
    timeStart: z
        .string()
        .refine((val) => !isNaN(Date.parse(val)), {
            error: "timeStart must be a valid ISO date string"
        })
        .transform((val) => Math.floor(new Date(val).getTime() / 1000))
        .optional(),
    timeEnd: z
        .string()
        .refine((val) => !isNaN(Date.parse(val)), {
            error: "timeEnd must be a valid ISO date string"
        })
        .transform((val) => Math.floor(new Date(val).getTime() / 1000))
        .optional()
        .prefault(new Date().toISOString())
        .openapi({
            type: "string",
            format: "date-time",
            description:
                "End time as ISO date string (defaults to current time)"
        }),
    resourceId: z
        .string()
        .optional()
        .transform(Number)
        .pipe(z.int().positive())
        .optional()
});

const queryRequestAuditLogsParams = z.object({
    orgId: z.string()
});

const queryRequestAuditLogsCombined = queryAccessAuditLogsQuery.merge(
    queryRequestAuditLogsParams
);

type Q = z.infer<typeof queryRequestAuditLogsCombined>;

async function query(query: Q) {
    let baseConditions = and(
        eq(requestAuditLog.orgId, query.orgId),
        lt(requestAuditLog.timestamp, query.timeEnd)
    );

    if (query.timeStart) {
        baseConditions = and(
            baseConditions,
            gt(requestAuditLog.timestamp, query.timeStart)
        );
    }
    if (query.resourceId) {
        baseConditions = and(
            baseConditions,
            eq(requestAuditLog.resourceId, query.resourceId)
        );
    }

    const [totalRequests] = await db
        .select({ total: count() })
        .from(requestAuditLog)
        .where(baseConditions);

    const [totalBlocked] = await db
        .select({ blocked: count() })
        .from(requestAuditLog)
        .where(and(baseConditions, eq(requestAuditLog.action, false)));

    const requestsPerCountry = await db
        .select({
            country_code: requestAuditLog.location,
            total: sql<number>`count(${requestAuditLog.id})`
                .mapWith(Number)
                .as("total")
        })
        .from(requestAuditLog)
        .where(baseConditions)
        .groupBy(requestAuditLog.location);

    return { requestsPerCountry, totalBlocked, totalRequests };
}

// function getWhere(data: Q) {
//     return and(
//         gt(requestAuditLog.timestamp, data.timeStart),
//         lt(requestAuditLog.timestamp, data.timeEnd),
//         eq(requestAuditLog.orgId, data.orgId),
//         data.resourceId
//             ? eq(requestAuditLog.resourceId, data.resourceId)
//             : undefined,
//         data.actor ? eq(requestAuditLog.actor, data.actor) : undefined,
//         data.method ? eq(requestAuditLog.method, data.method) : undefined,
//         data.reason ? eq(requestAuditLog.reason, data.reason) : undefined,
//         data.host ? eq(requestAuditLog.host, data.host) : undefined,
//         data.location ? eq(requestAuditLog.location, data.location) : undefined,
//         data.path ? eq(requestAuditLog.path, data.path) : undefined,
//         data.action !== undefined
//             ? eq(requestAuditLog.action, data.action)
//             : undefined
//     );
// }

// function queryRequest(data: Q) {
//     return db
//         .select({
//             id: requestAuditLog.id,
//             timestamp: requestAuditLog.timestamp,
//             orgId: requestAuditLog.orgId,
//             action: requestAuditLog.action,
//             reason: requestAuditLog.reason,
//             actorType: requestAuditLog.actorType,
//             actor: requestAuditLog.actor,
//             actorId: requestAuditLog.actorId,
//             resourceId: requestAuditLog.resourceId,
//             ip: requestAuditLog.ip,
//             location: requestAuditLog.location,
//             userAgent: requestAuditLog.userAgent,
//             metadata: requestAuditLog.metadata,
//             headers: requestAuditLog.headers,
//             query: requestAuditLog.query,
//             originalRequestURL: requestAuditLog.originalRequestURL,
//             scheme: requestAuditLog.scheme,
//             host: requestAuditLog.host,
//             path: requestAuditLog.path,
//             method: requestAuditLog.method,
//             tls: requestAuditLog.tls,
//             resourceName: resources.name,
//             resourceNiceId: resources.niceId
//         })
//         .from(requestAuditLog)
//         .leftJoin(
//             resources,
//             eq(requestAuditLog.resourceId, resources.resourceId)
//         ) // TODO: Is this efficient?
//         .where(getWhere(data))
//         .orderBy(desc(requestAuditLog.timestamp), desc(requestAuditLog.id));
// }

// function countRequestQuery(data: Q) {
//     const countQuery = db
//         .select({ count: count() })
//         .from(requestAuditLog)
//         .where(getWhere(data));
//     return countQuery;
// }

registry.registerPath({
    method: "get",
    path: "/org/{orgId}/logs/analytics",
    description: "Query the request audit analytics for an organization",
    tags: [OpenAPITags.Org],
    request: {
        query: queryAccessAuditLogsQuery,
        params: queryRequestAuditLogsParams
    },
    responses: {}
});

// async function queryUniqueFilterAttributes(
//     timeStart: number,
//     timeEnd: number,
//     orgId: string
// ) {
//     const baseConditions = and(
//         gt(requestAuditLog.timestamp, timeStart),
//         lt(requestAuditLog.timestamp, timeEnd),
//         eq(requestAuditLog.orgId, orgId)
//     );

//     // Get unique actors
//     const uniqueActors = await db
//         .selectDistinct({
//             actor: requestAuditLog.actor
//         })
//         .from(requestAuditLog)
//         .where(baseConditions);

//     // Get unique locations
//     const uniqueLocations = await db
//         .selectDistinct({
//             locations: requestAuditLog.location
//         })
//         .from(requestAuditLog)
//         .where(baseConditions);

//     // Get unique actors
//     const uniqueHosts = await db
//         .selectDistinct({
//             hosts: requestAuditLog.host
//         })
//         .from(requestAuditLog)
//         .where(baseConditions);

//     // Get unique actors
//     const uniquePaths = await db
//         .selectDistinct({
//             paths: requestAuditLog.path
//         })
//         .from(requestAuditLog)
//         .where(baseConditions);

//     // Get unique resources with names
//     const uniqueResources = await db
//         .selectDistinct({
//             id: requestAuditLog.resourceId,
//             name: resources.name
//         })
//         .from(requestAuditLog)
//         .leftJoin(
//             resources,
//             eq(requestAuditLog.resourceId, resources.resourceId)
//         )
//         .where(baseConditions);

//     return {
//         actors: uniqueActors
//             .map((row) => row.actor)
//             .filter((actor): actor is string => actor !== null),
//         resources: uniqueResources.filter(
//             (row): row is { id: number; name: string | null } => row.id !== null
//         ),
//         locations: uniqueLocations
//             .map((row) => row.locations)
//             .filter((location): location is string => location !== null),
//         hosts: uniqueHosts
//             .map((row) => row.hosts)
//             .filter((host): host is string => host !== null),
//         paths: uniquePaths
//             .map((row) => row.paths)
//             .filter((path): path is string => path !== null)
//     };
// }

export type QueryRequestAnalyticsResponse = Awaited<ReturnType<typeof query>>;

export async function queryRequestAnalytics(
    req: Request,
    res: Response,
    next: NextFunction
): Promise<any> {
    try {
        const parsedQuery = queryAccessAuditLogsQuery.safeParse(req.query);
        if (!parsedQuery.success) {
            return next(
                createHttpError(
                    HttpCode.BAD_REQUEST,
                    fromError(parsedQuery.error)
                )
            );
        }

        const parsedParams = queryRequestAuditLogsParams.safeParse(req.params);
        if (!parsedParams.success) {
            return next(
                createHttpError(
                    HttpCode.BAD_REQUEST,
                    fromError(parsedParams.error)
                )
            );
        }

        const params = { ...parsedQuery.data, ...parsedParams.data };

        const data = await query(params);

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