import { Context, Router } from "https://deno.land/x/oak/mod.ts";
import { FileService } from "./fileservice.ts";
import { readerFromStreamReader } from "https://deno.land/std@0.189.0/streams/mod.ts";
import { asyncIterableToArray } from "./utils.ts";
import { StringReader } from "https://deno.land/std@0.178.0/io/string_reader.ts";
import { isReader } from "https://deno.land/x/oak@v12.5.0/util.ts";
import { createMockNext } from "https://deno.land/x/oak@v12.1.0/testing.ts";


type Handler = (ctx: Context) => void;


function listFileHandlerFactory(fileService: FileService): Handler {
    return async (ctx: Context) => {
        ctx.response.type = "application/json";
        ctx.response.body = await asyncIterableToArray(fileService.list());
    };
}


function createFileHandlerFactory(fileService: FileService): Handler {
    return async (ctx: Context) => {
        const untypedCtx: any = ctx;
        ctx.response.body = 'This is a post';
        const path = untypedCtx.request.url.searchParams.get('path');

        const reqBody = await ctx.request.body({ type: "stream" }).value;
        const reader = readerFromStreamReader(reqBody.getReader())
        fileService.createFromReader(path, reader);
    };
}


function getFileHandlerFactory(fileService: FileService): Handler {
    return async (ctx: Context) => {
        const untypedCtx: any = ctx;
        const fileId = untypedCtx.params.file_id;
        const reader = await fileService.getBodyAsReader(fileId);
        if(reader == null){
            ctx.response.status = 404;
            return;
        }
        ctx.response.status = 200;
        ctx.response.body = reader;
        ctx.response.type = "text/plain";
        // ctx.send(reader)

    };
}


export function buildAPI(router: Router, fileService: FileService): Router {

    router.get('/files', listFileHandlerFactory(fileService));
    router.get('/files/:file_id', getFileHandlerFactory(fileService));
    router.post('/files', createFileHandlerFactory(fileService));

    return router;
}