import { OB11EmitEventContent, OB11NetworkReloadType } from './index';
import express, { Express, NextFunction, Request, Response } from 'express';
import http from 'http';
import { NapCatCore } from '@/core';
import { OB11Response } from '@/onebot/action/OneBotAction';
import { ActionMap } from '@/onebot/action';
import cors from 'cors';
import { HttpServerConfig } from '@/onebot/config/config';
import { NapCatOneBot11Adapter } from '@/onebot';
import { IOB11NetworkAdapter } from '@/onebot/network/adapter';
import json5 from 'json5';

export class OB11HttpServerAdapter extends IOB11NetworkAdapter<HttpServerConfig> {
    private app: Express | undefined;
    private server: http.Server | undefined;

    constructor(name: string, config: HttpServerConfig, core: NapCatCore, obContext: NapCatOneBot11Adapter, actions: ActionMap) {
        super(name, config, core, obContext, actions);
    }

    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    override onEvent<T extends OB11EmitEventContent>(_event: T) {
        // http server is passive, no need to emit event
    }

    open() {
        try {
            if (this.isEnable) {
                this.core.context.logger.logError('Cannot open a closed HTTP server');
                return;
            }
            if (!this.isEnable) {
                this.initializeServer();
                this.isEnable = true;
            }
        } catch (e) {
            this.core.context.logger.logError(`[OneBot] [HTTP Server Adapter] Boot Error: ${e}`);
        }

    }

    async close() {
        this.isEnable = false;
        this.server?.close();
        this.app = undefined;
    }

    private isFinished(req: Request): boolean {
        return req.complete;
    }

    private hasbody(req: Request): boolean {
        return req.headers['content-length'] !== undefined && req.headers['content-length'] !== '0';
    }

    private initializeServer() {
        this.app = express();
        this.server = http.createServer(this.app);

        this.app.use(cors());
        this.app.use(express.urlencoded({ extended: true, limit: '5000mb' }));

        this.app.use((req, res, next) => {
            if (this.isFinished(req)) {
                next();
                return;
            }
            if (!this.hasbody(req)) {
                next();
                return;
            }
            // 兼容处理没有带content-type的请求
            req.headers['content-type'] = 'application/json';
            let rawData = '';
            req.on('data', (chunk) => {
                rawData += chunk;
            });
            req.on('end', () => {
                try {
                    req.body = { ...json5.parse(rawData || '{}'), ...req.body };
                    next();
                } catch {
                    return res.status(400).send('Invalid JSON');
                }
                return;
            });
            req.on('error', () => {
                return res.status(400).send('Invalid JSON');
            });
        });
        //@ts-expect-error authorize
        this.app.use((req, res, next) => this.authorize(this.config.token, req, res, next));
        this.app.use(async (req, res) => {
            await this.handleRequest(req, res);
        });
        this.server.listen(this.config.port, () => {
            this.core.context.logger.log(`[OneBot] [HTTP Server Adapter] Start On Port ${this.config.port}`);
        });
    }

    private authorize(token: string | undefined, req: Request, res: Response, next: NextFunction) {
        if (!token || token.length == 0) return next();//客户端未设置密钥
        const HeaderClientToken = req.headers.authorization?.split('Bearer ').pop() || '';
        const QueryClientToken = req.query['access_token'];
        const ClientToken = typeof (QueryClientToken) === 'string' && QueryClientToken !== '' ? QueryClientToken : HeaderClientToken;
        if (ClientToken === token) {
            return next();
        } else {
            return res.status(403).send(JSON.stringify({ message: 'token verify failed!' }));
        }
    }

    async httpApiRequest(req: Request, res: Response) {
        let payload = req.body;
        if (req.method == 'get') {
            payload = req.query;
        } else if (req.query) {
            payload = { ...req.body, ...req.query };
        }
        if (req.path === '' || req.path === '/') {
            const hello = OB11Response.ok({});
            hello.message = 'NapCat4 Is Running';
            return res.json(hello);
        }
        const actionName = req.path.split('/')[1];
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        const action = this.actions.get(actionName as any);
        if (action) {
            try {
                const result = await action.handle(payload, this.name, this.config);
                return res.json(result);
            } catch (error: unknown) {
                return res.json(OB11Response.error((error as Error)?.stack?.toString() || (error as Error)?.message || 'Error Handle', 200));
            }
        } else {
            return res.json(OB11Response.error('不支持的Api ' + actionName, 200));
        }
    }

    async handleRequest(req: Request, res: Response) {
        if (!this.isEnable) {
            this.core.context.logger.log('[OneBot] [HTTP Server Adapter] Server is closed');
            res.json(OB11Response.error('Server is closed', 200));
            return;
        }
        this.httpApiRequest(req, res);
        return;
    }

    async reload(newConfig: HttpServerConfig) {
        const wasEnabled = this.isEnable;
        const oldPort = this.config.port;
        this.config = newConfig;

        if (newConfig.enable && !wasEnabled) {
            this.open();
            return OB11NetworkReloadType.NetWorkOpen;
        } else if (!newConfig.enable && wasEnabled) {
            this.close();
            return OB11NetworkReloadType.NetWorkClose;
        }

        if (oldPort !== newConfig.port) {
            this.close();
            if (newConfig.enable) {
                this.open();
            }
            return OB11NetworkReloadType.NetWorkReload;
        }

        return OB11NetworkReloadType.Normal;
    }
}