import { GraphQLError } from 'graphql'
import { amountSchema, ssValidate } from '../../lib/validate'
import { serializeInvoicable } from './serial'
import { ANON_USER_ID } from '../../lib/constants'
import { getItem } from './item'

const rewardCache = new Map()

async function updateCachedRewards (when, models) {
  const rewards = await getRewards(when, models)
  rewardCache.set(when, { rewards, createdAt: Date.now() })
  return rewards
}

async function getCachedRewards (staleIn, when, models) {
  if (rewardCache.has(when)) {
    const { rewards, createdAt } = rewardCache.get(when)
    const expired = createdAt + staleIn < Date.now()
    if (expired) updateCachedRewards(when, models).catch(console.error)
    return rewards // serve stale rewards
  }
  return await updateCachedRewards(when, models)
}

async function getRewards (when, models) {
  if (when) {
    if (when.length > 2) {
      throw new GraphQLError('too many dates', { extensions: { code: 'BAD_USER_INPUT' } })
    }
    when.forEach(w => {
      if (isNaN(new Date(w))) {
        throw new GraphQLError('invalid date', { extensions: { code: 'BAD_USER_INPUT' } })
      }
    })
    if (new Date(when[0]) > new Date(when[when.length - 1])) {
      throw new GraphQLError('bad date range', { extensions: { code: 'BAD_USER_INPUT' } })
    }
  }

  const results = await models.$queryRaw`
    WITH days_cte (day) AS (
      SELECT date_trunc('day', t)
      FROM generate_series(
        COALESCE(${when?.[0]}::text::timestamp - interval '1 day', now() AT TIME ZONE 'America/Chicago'),
        COALESCE(${when?.[when.length - 1]}::text::timestamp - interval '1 day', now() AT TIME ZONE 'America/Chicago'),
        interval '1 day') AS t
    )
    SELECT coalesce(FLOOR(sum(sats)), 0) as total,
      days_cte.day + interval '1 day' as time,
      json_build_array(
        json_build_object('name', 'donations', 'value', coalesce(FLOOR(sum(sats) FILTER(WHERE type = 'DONATION')), 0)),
        json_build_object('name', 'fees', 'value', coalesce(FLOOR(sum(sats) FILTER(WHERE type NOT IN ('BOOST', 'STREAM', 'DONATION', 'ANON'))), 0)),
        json_build_object('name', 'boost', 'value', coalesce(FLOOR(sum(sats) FILTER(WHERE type = 'BOOST')), 0)),
        json_build_object('name', 'jobs', 'value', coalesce(FLOOR(sum(sats) FILTER(WHERE type = 'STREAM')), 0)),
        json_build_object('name', 'anon''s stack', 'value', coalesce(FLOOR(sum(sats) FILTER(WHERE type = 'ANON')), 0))
    ) AS sources
    FROM days_cte
    CROSS JOIN LATERAL (
      (SELECT ("ItemAct".msats - COALESCE("ReferralAct".msats, 0)) / 1000.0 as sats, act::text as type
        FROM "ItemAct"
        LEFT JOIN "ReferralAct" ON "ReferralAct"."itemActId" = "ItemAct".id
        WHERE date_trunc('day', "ItemAct".created_at AT TIME ZONE 'UTC' AT TIME ZONE 'America/Chicago') = days_cte.day AND "ItemAct".act <> 'TIP')
        UNION ALL
      (SELECT sats::FLOAT, 'DONATION' as type
        FROM "Donation"
        WHERE date_trunc('day', created_at AT TIME ZONE 'UTC' AT TIME ZONE 'America/Chicago') = days_cte.day)
        UNION ALL
      -- any earnings from anon's stack that are not forwarded to other users
      (SELECT "ItemAct".msats / 1000.0 as sats, 'ANON' as type
        FROM "Item"
        JOIN "ItemAct" ON "ItemAct"."itemId" = "Item".id
        LEFT JOIN "ItemForward" ON "ItemForward"."itemId" = "Item".id
        WHERE "Item"."userId" = ${ANON_USER_ID} AND "ItemAct".act = 'TIP'
        AND date_trunc('day', "ItemAct".created_at AT TIME ZONE 'UTC' AT TIME ZONE 'America/Chicago') = days_cte.day
        GROUP BY "ItemAct".id, "ItemAct".msats
        HAVING COUNT("ItemForward".id) = 0)
    ) subquery
    GROUP BY days_cte.day
    ORDER BY days_cte.day ASC`

  return results.length ? results : [{ total: 0, time: '0', sources: [] }]
}

export default {
  Query: {
    rewards: async (parent, { when }, { models }) =>
      when ? await getRewards(when, models) : await getCachedRewards(5000, when, models),
    meRewards: async (parent, { when }, { me, models }) => {
      if (!me) {
        return null
      }

      if (!when || when.length > 2) {
        throw new GraphQLError('invalid date range', { extensions: { code: 'BAD_USER_INPUT' } })
      }
      for (const w of when) {
        if (isNaN(new Date(w))) {
          throw new GraphQLError('invalid date', { extensions: { code: 'BAD_USER_INPUT' } })
        }
      }

      const results = await models.$queryRaw`
        WITH days_cte (day) AS (
          SELECT date_trunc('day', t)
          FROM generate_series(
            ${when[0]}::text::timestamp,
            ${when[when.length - 1]}::text::timestamp,
            interval '1 day') AS t
        )
        SELECT coalesce(sum(sats), 0) as total, json_agg("Earn".*) as rewards
        FROM days_cte
        CROSS JOIN LATERAL (
          (SELECT FLOOR("Earn".msats / 1000.0) as sats, type, rank, "typeId"
            FROM "Earn"
            WHERE "Earn"."userId" = ${me.id}
            AND date_trunc('day', "Earn".created_at AT TIME ZONE 'UTC' AT TIME ZONE 'America/Chicago') = days_cte.day
            ORDER BY "Earn".msats DESC)
        ) "Earn"
        GROUP BY days_cte.day
        ORDER BY days_cte.day ASC`

      return results
    }
  },
  Mutation: {
    donateToRewards: async (parent, { sats, hash, hmac }, { me, models, lnd }) => {
      await ssValidate(amountSchema, { amount: sats })

      await serializeInvoicable(
        models.$queryRaw`SELECT donate(${sats}::INTEGER, ${me?.id || ANON_USER_ID}::INTEGER)`,
        { models, lnd, hash, hmac, me, enforceFee: sats }
      )

      return sats
    }
  },
  Reward: {
    item: async (reward, args, { me, models }) => {
      if (!reward.typeId) {
        return null
      }

      return getItem(reward, { id: reward.typeId }, { me, models })
    }
  }
}