feat: foxwifhat discount

[NeOMakinG]

Description

Adding the foxwifhat discount if the section is enabled:

• Campaign is starting from now to 5th may (to be modified before the flag is turned on)
• Decrease linearly to the 5 may from 100% to 0%
• Added automated tests Removed them as the flag is off in prod and is always off in the tests

Issue (if applicable)

closes #8588

Risk

Medium, could result in free trades somehow

High Risk PRs Require 2 approvals

What protocols, transaction types, wallets or contract interactions might be affected by this PR?

Testing

• Try every sort of trades amount (< 1000$, > 1000$) using different types of account:
  -- Traditional Fox discount
  -- Fox Wif Hat discount (if you have at least 10k FWH, the discount decrease linearly)
  -- If you are a dev, monkey patch the logic inside calculateFees to test that the highest discount possible

Engineering

Operations

• 🏁 My feature is behind a flag and doesn't require operations testing (yet)

Screenshots (if applicable)

very big fox holding (dao's addy)

No discount => no foxwifhat and no foxes

FOXWifHat holder

Free because feeBps are under 1 as float

Foxwifhatholder but 50% of the time expired already

23bps instead of 47

Foxwifhatholder but 100% of the time expired already

47 bps!

Expired but fox holding is so big that it's free!

[gomesalexandre]

Tested locally against develop (right):

• 11,000 FWH held, moderate-size trade right above the fees curve - FWH discount higher than regular FOX fees curve

• 11,000 FWH held, smaller trade right undeer the fees curve - no fees regardless of FWH holdings

• No wallet, no discount

• FOX fee curve discount higher than FWH discount (shapeshiftdao.eth)

• Just under the fee curve - shapeshiftdao.eth

• FWH holder (11,000 FWH), 50% elapsed, tested with the monkey-patch below to get midpoint: half the bps, 100% the lulz

diff --git a/src/lib/fees/model.ts b/src/lib/fees/model.ts
index 20007fbad3..7a965dbcd4 100644
--- a/src/lib/fees/model.ts
+++ b/src/lib/fees/model.ts
@@ -82,7 +82,11 @@ export const calculateFees: CalculateFeeBps = ({
     if (!isFoxWifHatCampaignActive) return bn(0)
     if (!isFoxWifHatDiscountEligible) return bn(0)
 
-    const currentTime = new Date().getTime()
+    // 50% monkey
+    const campaignStartTime = FOX_WIF_HAT_CAMPAIGN_STARTING_TIME_MS
+    const campaignEndTime = FOX_WIF_HAT_CAMPAIGN_ENDING_TIME_MS
+    const halfwayTime = campaignStartTime + (campaignEndTime - campaignStartTime) / 2
+    const currentTime = new Date(halfwayTime).getTime()
     const totalCampaignDuration =
       FOX_WIF_HAT_CAMPAIGN_ENDING_TIME_MS - FOX_WIF_HAT_CAMPAIGN_STARTING_TIME_MS
     const timeElapsed = currentTime - FOX_WIF_HAT_CAMPAIGN_STARTING_TIME_MS

• Same as above but 100% time expired with the monkey-patch below: 0% the FWH discount, but still 100% here for the lulz

diff --git a/src/lib/fees/model.ts b/src/lib/fees/model.ts
index 20007fbad3..a66c1af4f9 100644
--- a/src/lib/fees/model.ts
+++ b/src/lib/fees/model.ts
@@ -82,7 +82,10 @@ export const calculateFees: CalculateFeeBps = ({
     if (!isFoxWifHatCampaignActive) return bn(0)
     if (!isFoxWifHatDiscountEligible) return bn(0)
 
-    const currentTime = new Date().getTime()
+    // 100% time expired, no dice for you FWH holder
+    const campaignEndTime = FOX_WIF_HAT_CAMPAIGN_ENDING_TIME_MS
+    const expiredTime = campaignEndTime + 1000 // 1 second after campaign ends
+    const currentTime = new Date(expiredTime).getTime()
     const totalCampaignDuration =
       FOX_WIF_HAT_CAMPAIGN_ENDING_TIME_MS - FOX_WIF_HAT_CAMPAIGN_STARTING_TIME_MS
     const timeElapsed = currentTime - FOX_WIF_HAT_CAMPAIGN_STARTING_TIME_MS