import fetch from "node-fetch"
import { NotificationData, processEmail } from "./workflows.js"
import qs from 'qs'
import { IPlatformNotificationResponse, IVtuberResponse, IStreamResponse } from 'next'
import { getImage } from '../vtuber.js'
import { fpSlugify } from '../utils.js'
import { getProminentColor } from '../image.js'
import { uploadFile } from '../s3.js'
import { addMinutes, subMinutes } from 'date-fns'

export type ChargeResult = {
  status: string;
  errorMessage?: string;
};


if (!process.env.SCOUT_STRAPI_API_KEY) throw new Error('SCOUT_STRAPI_API_KEY is missing from env');
if (!process.env.STRAPI_URL) throw new Error('STRAPI_URL is missing from env');
if (!process.env.CDN_BUCKET_URL) throw new Error('CDN_BUCKET_URL is missing from env');
if (!process.env.SCOUT_NITTER_URL) throw new Error('SCOUT_NITTER_URL is missing from env');
if (!process.env.SCOUT_NITTER_ACCESS_KEY) throw new Error('SCOUT_NITTER_ACCESS_KEY is missing from env');




/**
 * find or create vtuber in Strapi
 */
export async function upsertVtuber({ platform, userId, url, channel }: NotificationData): Promise<number> {

  let vtuberId
  console.log('>> # Step 1, upsertVtuber')
  // # Step 1.
  // First we find or create the vtuber
  // The vtuber may already be in the db, so we look for that record. All we need is the Vtuber ID.
  // If the vtuber is not in the db, we create the vtuber record.

  // GET /api/:pluralApiId?filters[field][operator]=value
  const findVtubersFilters = (() => {
    if (platform === 'chaturbate') {
      return { chaturbate: { $eq: url } }
    } else if (platform === 'fansly') {
      if (!userId) throw new Error('Fansly userId was undefined, but it is required.')
      return { fanslyId: { $eq: userId } }
    }
  })()
  console.log('>>>>> the following is findVtubersFilters.')
  console.log(findVtubersFilters)

  const findVtubersQueryString = qs.stringify({
    filters: findVtubersFilters
  }, { encode: false })
  console.log(`>>>>> platform=${platform}, url=${url}, userId=${userId}`)

  console.log('>> findVtuber')
  const findVtuberRes = await fetch(`${process.env.STRAPI_URL}/api/vtubers?${findVtubersQueryString}`, {
    method: 'GET',
    headers: {
      'content-type': 'application/json'
    }
  })
  const findVtuberJson = await findVtuberRes.json() as IVtuberResponse
  console.log('>> here is the vtuber json')
  console.log(findVtuberJson)
  if (findVtuberJson?.data && findVtuberJson.data.length > 0) {
    console.log('>> a vtuber was FOUND')
    if (findVtuberJson.data.length > 1) throw new Error('There was more than one vtuber match. There must only be one.')
    vtuberId = findVtuberJson.data[0].id
    console.log('here is the findVtuberJson (as follows)')
    console.log(findVtuberJson)
    console.log(`the matching vtuber has ID=${vtuberId} (${findVtuberJson.data[0].attributes.displayName})`)
  }

  if (!vtuberId) {
    console.log('>> vtuberId was not found so we create')

    /**
     * We are creating a vtuber record.
     * We need a few things.
     *   * image URL
     *   * themeColor
     * 
     * To get an image, we have to do a few things.
     *   * [x] download image from platform
     *   * [x] get themeColor from image
     *   * [x] upload image to b2
     *   * [x] get B2 cdn link to image
     * 
     * To get themeColor, we need the image locally where we can then run 
     */

    // download image from platform
    // vtuber.getImage expects a vtuber object, which we don't have yet, so we create a dummy one
    const dummyVtuber = {
      attributes: {
        slug: fpSlugify(channel),
        fanslyId: (platform === 'fansly') ? userId : null
      }
    }
    const imageFile = await getImage(dummyVtuber)

    // get themeColor from image
    const themeColor = await getProminentColor(imageFile)

    // upload image to b2
    const b2FileData = await uploadFile(imageFile)

    // get b2 cdn link to image
    const imageCdnLink = `${process.env.CDN_BUCKET_URL}/${b2FileData.Key}`

    console.log(`>>> createVtuberRes here we go 3-2-1, POST!`)
    const createVtuberRes = await fetch(`${process.env.STRAPI_URL}/api/vtubers`, {
      method: 'POST',
      headers: {
        'authorization': `Bearer ${process.env.SCOUT_STRAPI_API_KEY}`,
        'content-type': 'application/json'
      },
      body: JSON.stringify({
        data: {
          displayName: channel,
          fansly: (platform === 'fansly') ? url : null,
          fanslyId: (platform === 'fansly') ? userId : null,
          chaturbate: (platform === 'chaturbate') ? url : null,
          slug: fpSlugify(channel),
          description1: ' ',
          image: imageCdnLink,
          themeColor: themeColor || '#dde1ec'
        }
      })
    })
    const createVtuberJson = await createVtuberRes.json() as IVtuberResponse
    console.log('>> createVtuberJson as follows')
    console.log(JSON.stringify(createVtuberJson, null, 2))
    if (createVtuberJson.data) {
      vtuberId = createVtuberJson.data.id
      console.log(`>>> vtuber created with id=${vtuberId}`)
    }
  }
  if (!vtuberId) throw new Error(`upsertVtuber failed to produce a vtuberId! This should not happen under normal circumstances.`);
  return vtuberId
}
export async function upsertPlatformNotification({ source, date, platform, vtuberId }: { source: string, date: string, platform: string, vtuberId: number }): Promise<number> {
  if (!source) throw new Error(`upsertPlatformNotification requires source arg, but it was undefined`);
  if (!date) throw new Error(`upsertPlatformNotification requires date arg, but it was undefined`);
  if (!platform) throw new Error(`upsertPlatformNotification requires platform arg, but it was undefined`);
  if (!vtuberId) throw new Error(`upsertPlatformNotification requires vtuberId arg, but it was undefined`);

  let pNotifId
  // # Step 2.
  // Next we create the platform-notification record.
  // This probably doesn't already exist, so we don't check for a pre-existing platform-notification.
  const pNotifPayload = {
    data: {
      source: source,
      date: date,
      date2: date,
      platform: platform,
      vtuber: vtuberId,
    }
  }
  console.log('pNotifPayload as follows')
  console.log(pNotifPayload)

  const pNotifCreateRes = await fetch(`${process.env.STRAPI_URL}/api/platform-notifications`, {
    method: 'POST',
    headers: {
      'authorization': `Bearer ${process.env.SCOUT_STRAPI_API_KEY}`,
      'Content-Type': 'application/json'
    },
    body: JSON.stringify(pNotifPayload)
  })
  const pNotifData = await pNotifCreateRes.json() as IPlatformNotificationResponse
  if (pNotifData.error) {
    console.error('>> we failed to create platform-notification, there was an error in the response')
    console.error(JSON.stringify(pNotifData.error, null, 2))
    throw new Error(pNotifData.error)
  }
  console.log(`>> pNotifData (json response) is as follows`)
  console.log(pNotifData)
  if (!pNotifData.data?.id) throw new Error('failed to created pNotifData! The response was missing an id');

  pNotifId = pNotifData.data.id
  if (!pNotifId) throw new Error('failed to get Platform Notification ID');
  return pNotifId

}
export async function upsertStream({
  date,
  vtuberId,
  platform,
  pNotifId
}: {
  date: string,
  vtuberId: number,
  platform: string,
  pNotifId: number
}): Promise<number> {

  if (!date) throw new Error(`upsertStream requires date in the arg object, but it was undefined`);
  if (!vtuberId) throw new Error(`upsertStream requires vtuberId in the arg object, but it was undefined`);
  if (!platform) throw new Error(`upsertStream requires platform in the arg object, but it was undefined`);
  if (!pNotifId) throw new Error(`upsertStream requires pNotifId in the arg object, but it was undefined`);

  let streamId
  // # Step 3.
  // Finally we find or create the stream record
  // The stream may already be in the db (the streamer is multi-platform streaming), so we look for that record.
  // This gets a bit tricky. How do we determine one stream from another?
  // For now, the rule is 30 minutes of separation. 
  // Anything <=30m is interpreted as the same stream. Anything >30m is interpreted as a different stream.
  // If the stream is not in the db, we create the stream record
  const dateSinceRange = subMinutes(new Date(date), 30)
  const dateUntilRange = addMinutes(new Date(date), 30)
  console.log(`Find a stream within + or - 30 mins of the notif date=${new Date(date).toISOString()}. dateSinceRange=${dateSinceRange.toISOString()}, dateUntilRange=${dateUntilRange.toISOString()}`)
  const findStreamQueryString = qs.stringify({
    populate: 'platform-notifications',
    filters: {
      date: {
        $gte: dateSinceRange,
        $lte: dateUntilRange
      },
      vtuber: {
        id: {
          '$eq': vtuberId
        }
      }
    }
  }, { encode: false })

  console.log('>> findStream')
  const findStreamRes = await fetch(`${process.env.STRAPI_URL}/api/streams?${findStreamQueryString}`, {
    method: 'GET',
    headers: {
      'authorization': `Bearer ${process.env.SCOUT_STRAPI_API_KEY}`,
      'Content-Type': 'application/json'
    }
  })
  const findStreamData = await findStreamRes.json() as IStreamResponse
  if (findStreamData?.data && findStreamData.data.length > 0) {
    console.log('>> we found a findStreamData json. (there is an existing stream for this e-mail/notification)')
    console.log(JSON.stringify(findStreamData, null, 2))
    streamId = findStreamData.data[0].id

    // Before we're done here, we need to do something extra. We need to populate isChaturbateStream and/or isFanslyStream.
    // We know which of these booleans to set based on the stream's related platformNotifications
    // We go through each pNotif and look at it's platform
    let isFanslyStream = false
    let isChaturbateStream = false
    if (findStreamData.data[0].attributes.platformNotifications) {
      for (const pn of findStreamData.data[0].attributes.platformNotifications) {
        if (pn.platform === 'fansly') {
          isFanslyStream = true
        } else if (pn.platform === 'chaturbate') {
          isChaturbateStream = true
        }
      }
    }


    console.log(`>>> updating stream ${streamId}. isFanslyStream=${isFanslyStream}, isChaturbateStream=${isChaturbateStream}`)
    const updateStreamRes = await fetch(`${process.env.STRAPI_URL}/api/streams/${streamId}`, {
      method: 'PUT',
      headers: {
        'authorization': `Bearer ${process.env.SCOUT_STRAPI_API_KEY}`,
        'content-type': 'application/json'
      },
      body: JSON.stringify({
        data: {
          isFanslyStream: isFanslyStream,
          isChaturbateStream: isChaturbateStream,
          platformNotifications: [
            pNotifId
          ]
        }
      })
    })
    const updateStreamJson = await updateStreamRes.json() as IStreamResponse
    if (updateStreamJson?.error) throw new Error(JSON.stringify(updateStreamJson, null, 2));
    console.log(`>> assuming a successful update to the stream record. response as follows.`)
    console.log(JSON.stringify(updateStreamJson, null, 2))
  }

  if (!streamId) {
    console.log('>> did not find a streamId, so we go ahead and create a stream record in the db.')
    const createStreamPayload = {
      data: {
        isFanslyStream: (platform === 'fansly') ? true : false,
        isChaturbateStream: (platform === 'chaturbate') ? true : false,
        archiveStatus: 'missing',
        date: date,
        date2: date,
        date_str: date,
        vtuber: vtuberId,
        platformNotifications: [
          pNotifId
        ]
      }
    }
    console.log('>> createStreamPayload as follows')
    console.log(createStreamPayload)
    const createStreamRes = await fetch(`${process.env.STRAPI_URL}/api/streams`, {
      method: 'POST',
      headers: {
        'authorization': `Bearer ${process.env.SCOUT_STRAPI_API_KEY}`,
        "Content-Type": "application/json"
      },
      body: JSON.stringify(createStreamPayload)
    })
    const createStreamJson = await createStreamRes.json() as IStreamResponse
    console.log('>> we got the createStreamJson')
    console.log(createStreamJson)
    if (createStreamJson.error) {
      console.error(JSON.stringify(createStreamJson.error, null, 2))
      throw new Error('Failed to create stream in DB due to an error. (see above)')
    }
    streamId = createStreamJson.id
  }

  if (!streamId) throw new Error('failed to get streamId')
  return streamId
}



export async function chargeUser(
  userId: string,
  itemId: string,
  quantity: number,
): Promise<ChargeResult> {
  // TODO send request to the payments service that looks up the user's saved
  // payment info and the cost of the item and attempts to charge their payment
  // method.
  console.log(`Charging user ${userId} for ${quantity} of item ${itemId}`);
  try {
    const response = await fetch("http://httpbin.org/get?status=success");
    const body: any = await response.json();
    return { status: body.args.status };
  } catch (e: any) {
    return { status: "failure", errorMessage: e.message };
  }
}

export async function checkAndDecrementInventory(
  itemId: string,
  quantity: number,
): Promise<boolean> {
  // TODO a database request that—in a single operation or transaction—checks
  // whether there are `quantity` items remaining, and if so, decreases the
  // total. Something like:
  // const result = await db.collection('items').updateOne(
  //   { _id: itemId, numAvailable: { $gte: quantity } },
  //   { $inc: { numAvailable: -quantity } }
  // )
  // return result.modifiedCount === 1
  console.log(`Reserving ${quantity} of item ${itemId}`);
  return true;
}

export async function incrementInventory(
  itemId: string,
  quantity: number,
): Promise<boolean> {
  // TODO increment inventory:
  // const result = await db.collection('items').updateOne(
  //   { _id: itemId },
  //   { $inc: { numAvailable: quantity } }
  // )
  // return result.modifiedCount === 1
  console.log(`Incrementing ${itemId} inventory by ${quantity}`);
  return true;
}