"use server";

import { auth } from "@clerk/nextjs";
import {
  modelEnumType,
  modelTable,
  ModelType,
  userVolume,
  UserVolumeType,
} from "@/db/schema";
import { withServerPromise } from "./withServerPromise";
import { db } from "@/db/db";
import type { z } from "zod";
import { headers } from "next/headers";
import { downloadUrlModelSchema } from "./addCivitaiModelSchema";
import { and, eq, isNull } from "drizzle-orm";
import { CivitaiModelResponse, getModelTypeDetails } from "@/types/civitai";

export async function getModel() {
  const { userId, orgId } = auth();
  if (!userId) throw new Error("No user id");
  const models = await db
    .select()
    .from(modelTable)
    .where(
      orgId
        ? eq(modelTable.org_id, orgId)
        // make sure org_id is null
        : and(
          eq(modelTable.user_id, userId),
          isNull(modelTable.org_id),
        ),
    );
  return models;
}

export async function getModelById(id: string) {
  const { userId, orgId } = auth();
  if (!userId) throw new Error("No user id");
  const model = await db
    .select()
    .from(modelTable)
    .where(
      and(
        orgId ? eq(modelTable.org_id, orgId) : and(
          eq(modelTable.user_id, userId),
          isNull(modelTable.org_id),
        ),
        eq(modelTable.id, id),
      ),
    );
  return model[0];
}

export async function getModelVolumes() {
  const { userId, orgId } = auth();
  if (!userId) throw new Error("No user id");
  const volume = await db
    .select()
    .from(userVolume)
    .where(
      and(
        orgId
          ? eq(userVolume.org_id, orgId)
          // make sure org_id is null
          : and(
            eq(userVolume.user_id, userId),
            isNull(userVolume.org_id),
          ),
        eq(userVolume.disabled, false),
      ),
    );
  return volume;
}

export async function retrieveModelVolumes() {
  let volumes = await getModelVolumes();
  if (volumes.length === 0) {
    // create volume if not already created
    volumes = await addModelVolume();
  }
  return volumes;
}

export async function addModelVolume() {
  const { userId, orgId } = auth();
  if (!userId) throw new Error("No user id");

  const insertedVolume = await db
    .insert(userVolume)
    .values({
      user_id: userId,
      org_id: orgId,
      volume_name: `models_${orgId ? orgId : userId}`, // if orgid is avalible use as part of the volume name
      disabled: false,
    })
    .returning();
  return insertedVolume;
}

function getUrl(civitai_url: string) {
  // expect to be a URL to be https://civitai.com/models/36520
  // possiblity with slugged name and query-param modelVersionId
  const baseUrl = "https://civitai.com/api/v1/models/";
  const url = new URL(civitai_url);
  const pathSegments = url.pathname.split("/");
  const modelId = pathSegments[pathSegments.indexOf("models") + 1];
  const modelVersionId = url.searchParams.get("modelVersionId");

  return { url: baseUrl + modelId, modelVersionId };
}

// Helper function to make a HEAD request and follow redirects
async function fetchFinalUrl(
  url: string,
): Promise<{ finalUrl: string; dispositionFilename?: string }> {
  console.log("fetching");
  const response = await fetch(url, { method: "HEAD", redirect: "follow" });
  if (!response.ok) {
    console.log("response not ok");
    throw new Error(`Request failed with status ${response.status}`);
  }
  const contentDisposition = response.headers.get("content-disposition");
  let filename;
  if (contentDisposition) {
    const matches = contentDisposition.match(
      /filename\*?=['"]?(?:UTF-8'')?([^;'"\n]*)['"]?;?/i,
    );
    filename = matches && matches[1]
      ? decodeURIComponent(matches[1])
      : undefined;
  }
  return { finalUrl: response.url, dispositionFilename: filename };
}

// The main function for validation
export const addModel = withServerPromise(
  async (data: z.infer<typeof downloadUrlModelSchema>) => {
    const { url } = data;

    if (url.includes("civitai.com/models/")) {
      // Make a HEAD request to check for 200 OK
      const response = await fetch(url, { method: "HEAD" });
      if (!response.ok) {
        createModelErrorRecord(
          url,
          `civitai gave non-ok response`,
          "civitai",
          data.model_type,
        );
      }
      addCivitaiModel(data);
    } else {
      const { finalUrl, dispositionFilename } = await fetchFinalUrl(url);
      console.log("finished fetching");
      console.log(finalUrl, dispositionFilename);

      if (!dispositionFilename) {
        console.log("no file name");
        createModelErrorRecord(
          url,
          `Could not find a filename from resolved Url: ${finalUrl}`,
          "download-url",
          data.model_type,
        );
        return;
      }

      const validExtensions = [".ckpt", ".pt", ".bin", ".pth", ".safetensors"];
      const extension = dispositionFilename.slice(
        dispositionFilename.lastIndexOf("."),
      );
      if (!validExtensions.includes(extension)) {
        console.log("invalid extension");
        createModelErrorRecord(
          url,
          `file ext ${extension} is invalid. Valid extensions: ${validExtensions}`,
          "download-url",
          data.model_type,
        );
      }
      addModelDownloadUrl(data, dispositionFilename);
    }
  },
);

export const addModelDownloadUrl = withServerPromise(
  async (data: z.infer<typeof downloadUrlModelSchema>, filename: string) => {
    console.log("adding model download");
    const { userId, orgId } = auth();
    if (!userId) return { error: "No user id" };
    const volumes = await retrieveModelVolumes();

    const a = await db
      .insert(modelTable)
      .values({
        user_id: userId,
        org_id: orgId,
        upload_type: "download-url",
        model_name: filename,
        user_url: data.url,
        user_volume_id: volumes[0].id,
        model_type: data.model_type,
      })
      .returning();

    const b = a[0];
    console.log("download url about to upload");
    await uploadModel(data, b, volumes[0]);
  },
);

export const getCivitaiModelRes = async (civitaiUrl: string) => {
  const { url, modelVersionId } = getUrl(civitaiUrl);
  const civitaiModelRes = await fetch(url)
    .then((x) => x.json())
    .then((a) => {
      return CivitaiModelResponse.parse(a);
    });
  return { civitaiModelRes, url, modelVersionId };
};

const createModelErrorRecord = async (
  url: string,
  errorMessage: string,
  upload_type: "civitai" | "download-url",
  model_type: modelEnumType,
) => {
  const { userId, orgId } = auth();
  if (!userId) return { error: "No user id" };
  const volumes = await retrieveModelVolumes();

  const a = await db
    .insert(modelTable)
    .values({
      user_id: userId,
      org_id: orgId,
      user_volume_id: volumes[0].id,
      upload_type: "civitai",
      model_type,
      civitai_url: upload_type === "civitai" ? url : undefined,
      user_url: upload_type === "download-url" ? url : undefined,
      error_log: errorMessage,
      status: "failed",
    })
    .returning();
  return a;
};

export const addCivitaiModel = withServerPromise(
  async (data: z.infer<typeof downloadUrlModelSchema>) => {
    const { userId, orgId } = auth();

    if (!userId) return { error: "No user id" };

    const { url, modelVersionId } = getUrl(data.url);
    const civitaiModelRes = await fetch(url)
      .then((x) => x.json())
      .then((a) => {
        return CivitaiModelResponse.parse(a);
      });

    if (civitaiModelRes?.modelVersions?.length === 0) {
      return; // no versions to download
    }

    let selectedModelVersion;
    let selectedModelVersionId: string | null = modelVersionId;
    if (!selectedModelVersionId) {
      selectedModelVersion = civitaiModelRes.modelVersions[0];
      selectedModelVersionId = civitaiModelRes.modelVersions[0].id.toString();
    } else {
      selectedModelVersion = civitaiModelRes.modelVersions.find((version) =>
        version.id.toString() === selectedModelVersionId
      );
      if (!selectedModelVersion) {
        return; // version id is wrong
      }
      selectedModelVersionId = selectedModelVersion?.id.toString();
    }

    const volumes = await retrieveModelVolumes();

    const model_type = getModelTypeDetails(civitaiModelRes.type);
    if (!model_type) {
      createModelErrorRecord(
        url,
        `Civitai model type ${civitaiModelRes.type} is not currently supported`,
        "civitai",
        data.model_type,
      );
      return;
    }

    const a = await db
      .insert(modelTable)
      .values({
        user_id: userId,
        org_id: orgId,
        upload_type: "civitai",
        model_name: selectedModelVersion.files[0].name,
        civitai_id: civitaiModelRes.id.toString(),
        civitai_version_id: selectedModelVersionId,
        civitai_url: data.url, // TODO: need to confirm
        civitai_download_url: selectedModelVersion.files[0].downloadUrl,
        civitai_model_response: civitaiModelRes,
        user_volume_id: volumes[0].id,
        model_type,
      })
      .returning();

    const b = a[0];

    await uploadModel(data, b, volumes[0]);
  },
);

// export const redownloadCheckpoint = withServerPromise(
//   async (data: CheckpointItemList) => {
//     const { userId } = auth();
//     if (!userId) return { error: "No user id" };
//
//     const checkpointVolumes = await getCheckpointVolumes();
//     let cVolume;
//     if (checkpointVolumes.length === 0) {
//       const volume = await addCheckpointVolume();
//       cVolume = volume[0];
//     } else {
//       cVolume = checkpointVolumes[0];
//     }
//
//     console.log("data");
//     console.log(data);
//
//     const a = await db
//       .update(checkpointTable)
//       .set({
//         // status: "started",
//         // updated_at: new Date(),
//       })
//       .returning();
//
//     const b = a[0];
//
//     console.log("b");
//     console.log(b);
//
//     await uploadCheckpoint(data, b, cVolume);
//     // redirect(`/checkpoints/${b.id}`);
//   },
// );

async function uploadModel(
  data: z.infer<typeof downloadUrlModelSchema>,
  c: ModelType,
  v: UserVolumeType,
) {
  const headersList = headers();

  const domain = headersList.get("x-forwarded-host") || "";
  const protocol = headersList.get("x-forwarded-proto") || "";

  if (domain === "") {
    throw new Error("No domain");
  }

  // Call remote builder
  const result = await fetch(
    `${process.env.MODAL_BUILDER_URL!}/upload-volume`,
    {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
      },
      body: JSON.stringify({
        download_url: c.upload_type === "civitai"
          ? c.civitai_download_url
          : c.user_url,
        volume_name: v.volume_name,
        volume_id: v.id,
        model_id: c.id,
        callback_url: `${protocol}://${domain}/api/volume-upload`,
        upload_type: c.model_type,
      }),
    },
  );

  if (!result.ok) {
    const error_log = await result.text();
    await db
      .update(modelTable)
      .set({
        status: "failed",
        error_log: error_log,
      })
      .where(eq(modelTable.id, c.id));
    throw new Error(`Error: ${result.statusText} ${error_log}`);
  } else {
    // setting the build machine id
    const json = await result.json();
    await db
      .update(modelTable)
      .set({
        ...data,
        upload_machine_id: json.build_machine_instance_id,
      })
      .where(eq(modelTable.id, c.id));
  }
}