import { ABC, Path, Compress, FS, Colors } from "../deps.ts";

import bucket from "../s3.ts";
import { isValidPackageName, basicauth, isValidFullVersion } from "../utils.ts";

import db, { IPackage } from "../db.ts";

import { v4 } from "https://deno.land/std/uuid/mod.ts";

export default function api(g: ABC.Group) {
   const cacheControl = (next: ABC.HandlerFunc) => (ctx: ABC.Context) => {
      ctx.response.headers.set("cache-control", "private");
      return next(ctx);
   };

   g.get(
      "/",
      (ctx) => {
         return { version: "1" };
      },
      cacheControl
   );

   // g.post("/getapikey", getApiKey, basicauth("api"));
   g.post("/package/:name", uploadPackage, cacheControl, basicauth("api"));
}

// async function getApiKey(ctx: ABC.Context) {
//    const key = v4.generate();

//    await db.api_key.insert({
//       user: ctx.customContext.user,
//       key,
//       createdAt: new Date(),
//       lastAccess: undefined,
//       lastIP: undefined,
//    });

//    return {
//       key,
//    };
// }

async function uploadPackage(ctx: ABC.Context) {
   const reqId = v4.generate();
   const filename = "./tmp/" + reqId + ".tar";
   const folder = "./tmp/" + reqId;

   try {
      const packageName = ctx.params.name.toLowerCase();

      if (!isValidPackageName(packageName)) {
         return {
            success: false,
            message: "Invalid package name",
         };
      }

      console.log("Writing body to tmp file:", filename);
      const file = await Deno.open(filename, {
         write: true,
         create: true,
      });
      await Deno.copy(ctx.request.body, file);
      file.close();

      console.log("Create unpacked folder");

      await Deno.mkdir(folder);

      console.log("Uncompressing tar");

      await Compress.Tar.uncompress(filename, folder);

      console.log("Reading meta.json");

      const fileContent = await Deno.readFile(Path.join(folder, "meta.json"));

      console.log("Parsing meta.json");

      const meta = JSON.parse(new TextDecoder().decode(fileContent));

      console.log("Checking meta.json");

      if (!meta?.version) {
         return {
            success: false,
            message: "No version available in meta.json",
         };
      }

      const packageVersion = meta.version;

      console.log("Checking correct version");

      if (!isValidFullVersion(packageVersion)) {
         return {
            success: false,
            message: "Invalid version. Version must be in format: 0.0.0",
         };
         return;
      }

      console.log("Checking for previous uploads");

      let packageMeta = await db.package.findOne({ name: packageName });

      console.log(meta, packageMeta);

      if (!packageMeta) {
         packageMeta = {
            name: packageName,
            owner: ctx.customContext.user,
            description: meta.description,
            deprecated: false,
            versions: [],
         };

         await db.package.insert(packageMeta);
      }

      console.log("Check if version was uploaded before");

      if (packageMeta.versions.find((e) => e === meta.version)) {
         return {
            success: false,
            message: "Version was already uploaded!",
         };
      }

      const bucketBase = "packages/" + packageName + "/" + packageVersion + "/";

      console.log("Uploading files to S3");

      const walker = FS.walk(folder, {
         includeFiles: true,
         includeDirs: false,
      });

      for await (const file of walker) {
         const relative = Path.relative(folder, file.path).replace("\\", "/");

         console.log("Normalised path:", relative.replace("\\", "/"));

         const bucketPath = (bucketBase + relative).replace(/@/g, "§");

         const body = await Deno.readAll(await Deno.open(file.path));
         await bucket.putObject(bucketPath, body, {});
      }
      console.log("Setting new live version");

      //TODO: Better option, since this could error whith multiple uploads to the same package at the same time
      await db.package.update(
         { name: packageName },
         {
            $set: {
               versions: [...packageMeta.versions, packageVersion],
               description: meta.description || packageMeta.description,
               deprecated: meta.deprecated === true,
            },
         }
      );

      console.log("Finished successfully");
      return {
         success: true,
      };
   } catch (err) {
      console.error(
         Colors.red("Error while processing newly uploaded package")
      );
      console.error(err);
      return {
         success: false,
         message: err.message,
      };
   } finally {
      console.log("Cleanup");
      await Deno.remove(filename).catch(console.error);
      await Deno.remove(folder, { recursive: true }).catch(console.error);
   }
}