import { performance } from "perf_hooks";
import { getIpHash } from "../../misc/get-ip-hash.js";
import { limiter } from "./limiter.js";
import endpoints from "./endpoints.js";
import compatibility from "./compatibility.js";
import { ApiError } from "./error.js";
import { apiLogger } from "./logger.js";
import { fetchMeta } from "../../misc/fetch-meta.js";
const accessDenied = {
    message: "Access denied.",
    code: "ACCESS_DENIED",
    id: "56f35758-7dd5-468b-8439-5d6fb8ec9b8e"
};
export default (async (endpoint, user, token, data, ctx)=>{
    const isSecure = user != null && token == null;
    const isModerator = user != null && (user.isModerator || user.isAdmin);
    const ep = endpoints.find((e)=>e.name === endpoint) || compatibility.find((e)=>e.name === endpoint);
    if (ep == null) {
        throw new ApiError({
            message: "No such endpoint.",
            code: "NO_SUCH_ENDPOINT",
            id: "f8080b67-5f9c-4eb7-8c18-7f1eeae8f709",
            httpStatusCode: 404
        });
    }
    if (ep.meta.secure && !isSecure) {
        throw new ApiError(accessDenied);
    }
    if (ep.meta.limit) {
        // koa will automatically load the `X-Forwarded-For` header if `proxy: true` is configured in the app.
        let limitActor;
        if (user) {
            limitActor = user.id;
        } else {
            limitActor = getIpHash(ctx.ip);
        }
        const limit = Object.assign({}, ep.meta.limit);
        if (!limit.key) {
            limit.key = ep.name;
        }
        // Rate limit
        await limiter(limit, limitActor).catch((e)=>{
            const remainingTime = e.remainingTime ? `Please try again in ${e.remainingTime}.` : "Please try again later.";
            throw new ApiError({
                message: `Rate limit exceeded. ${remainingTime}`,
                code: "RATE_LIMIT_EXCEEDED",
                id: "d5826d14-3982-4d2e-8011-b9e9f02499ef",
                httpStatusCode: 429
            });
        });
    }
    if (ep.meta.requireCredential && user == null) {
        throw new ApiError({
            message: "Credential required.",
            code: "CREDENTIAL_REQUIRED",
            id: "1384574d-a912-4b81-8601-c7b1c4085df1",
            httpStatusCode: 401
        });
    }
    if (ep.meta.requireCredential && user.isSuspended) {
        throw new ApiError({
            message: "Your account has been suspended.",
            code: "YOUR_ACCOUNT_SUSPENDED",
            id: "a8c724b3-6e9c-4b46-b1a8-bc3ed6258370",
            httpStatusCode: 403
        });
    }
    if (ep.meta.requireAdmin && !user.isAdmin) {
        throw new ApiError(accessDenied, {
            reason: "You are not an admin."
        });
    }
    if (ep.meta.requireModerator && !isModerator) {
        throw new ApiError(accessDenied, {
            reason: "You are not a moderator."
        });
    }
    if (token && ep.meta.kind && !token.permission.some((p)=>p === ep.meta.kind)) {
        throw new ApiError({
            message: "Your app does not have the necessary permissions to use this endpoint.",
            code: "PERMISSION_DENIED",
            id: "1370e5b7-d4eb-4566-bb1d-7748ee6a1838"
        });
    }
    // private mode
    const meta = await fetchMeta();
    if (meta.privateMode && ep.meta.requireCredentialPrivateMode && user == null) {
        throw new ApiError({
            message: "Credential required.",
            code: "CREDENTIAL_REQUIRED",
            id: "1384574d-a912-4b81-8601-c7b1c4085df1",
            httpStatusCode: 401
        });
    }
    // Cast non JSON input
    if ((ep.meta.requireFile || ctx?.method === "GET") && ep.params.properties) {
        for (const k of Object.keys(ep.params.properties)){
            const param = ep.params.properties[k];
            if ([
                "boolean",
                "number",
                "integer"
            ].includes(param.type ?? "") && typeof data[k] === "string") {
                try {
                    data[k] = JSON.parse(data[k]);
                } catch (e) {
                    throw new ApiError({
                        message: "Invalid param.",
                        code: "INVALID_PARAM",
                        id: "0b5f1631-7c1a-41a6-b399-cce335f34d85"
                    }, {
                        param: k,
                        reason: `cannot cast to ${param.type}`
                    });
                }
            }
        }
    }
    // API invoking
    const before = performance.now();
    return await ep.exec(data, user, token, ctx?.file, ctx?.ip, ctx?.headers).catch((e)=>{
        if (e instanceof ApiError) {
            throw e;
        } else {
            apiLogger.error(`Internal error occurred in ${ep.name}: ${e.message}`, {
                ep: ep.name,
                ps: data,
                e: {
                    message: e.message,
                    code: e.name,
                    stack: e.stack
                }
            });
            throw new ApiError(null, {
                e: {
                    message: e.message,
                    code: e.name,
                    stack: e.stack
                }
            });
        }
    }).finally(()=>{
        const after = performance.now();
        const time = after - before;
        if (time > 1000) {
            apiLogger.warn(`SLOW API CALL DETECTED: ${ep.name} (${time}ms)`);
        }
    });
});
