import 'cypress-hardhat/lib/browser'

import { Eip1193 } from 'cypress-hardhat/lib/browser/eip1193'
import { FeatureFlagClient, FeatureFlags, getFeatureFlagName } from 'uniswap/src/features/gating/flags'
import { UserState, initialState } from '../../src/state/user/reducer'
import { setInitialUserState } from '../utils/user-state'
import {
  ALLOW_ANALYTICS_ATOM_KEY,
} from 'utilities/src/telemetry/analytics/constants'

declare global {
  // eslint-disable-next-line @typescript-eslint/no-namespace
  namespace Cypress {
    interface ApplicationWindow {
      ethereum: Eip1193
    }
    interface Chainable<Subject> {
      /**
       * Wait for a specific event to be sent to amplitude. If the event is found, the subject will be the event.
       *
       * @param {string} eventName - The type of the event to search for e.g. SwapEventName.SWAP_TRANSACTION_COMPLETED
       * @param {number} timeout - The maximum amount of time (in ms) to wait for the event.
       * @returns {Chainable<Subject>}
       */
      waitForAmplitudeEvent(eventName: string, requiredProperties?: string[]): Chainable<Subject>
      /**
       * Intercepts a specific graphql operation and responds with the given fixture.
       * @param {string} operationName - The name of the graphql operation to intercept.
       * @param {string} fixturePath - The path to the fixture to respond with.
       */
      interceptGraphqlOperation(operationName: string, fixturePath: string): Chainable<Subject>
      /**
       * Intercepts a quote request and responds with the given fixture.
       * @param {string} fixturePath - The path to the fixture to respond with.
       */
      interceptQuoteRequest(fixturePath: string): Chainable<Subject>
    }
    interface Cypress {
      eagerlyConnect?: boolean
    }
    interface VisitOptions {
      featureFlags?: Array<{ flag: FeatureFlags; value: boolean }>
      /**
       * Initial user state.
       * @default {@type import('../utils/user-state').CONNECTED_WALLET_USER_STATE}
       */
      userState?: Partial<UserState>
      /**
       * If false, prevents the app from eagerly connecting to the injected provider.
       * @default true
       */
      eagerlyConnect?: false
    }
  }
}

export function registerCommands() {
  // sets up the injected provider to be a mock ethereum provider with the given mnemonic/index
  // eslint-disable-next-line no-undef
  Cypress.Commands.overwrite(
    'visit',
    (original, url: string | Partial<Cypress.VisitOptions>, options?: Partial<Cypress.VisitOptions>) => {
      if (typeof url !== 'string') {
        throw new Error('Invalid arguments. The first argument to cy.visit must be the path.')
      }

      // Parse overrides
      const flagsOn: FeatureFlags[] = []
      const flagsOff: FeatureFlags[] = []
      options?.featureFlags?.forEach((f) => {
        if (f.value) {
          flagsOn.push(f.flag)
        } else {
          flagsOff.push(f.flag)
        }
      })

      // Format into URL parameters
      const overrideParams = new URLSearchParams()
      if (flagsOn.length > 0) {
        overrideParams.append(
          'featureFlagOverride',
          flagsOn.map((flag) => getFeatureFlagName(flag, FeatureFlagClient.Web)).join(','),
        )
      }
      if (flagsOff.length > 0) {
        overrideParams.append(
          'featureFlagOverrideOff',
          flagsOn.map((flag) => getFeatureFlagName(flag, FeatureFlagClient.Web)).join(','),
        )
      }

      return cy.provider().then((provider) =>
        original({
          ...options,
          url:
            [...overrideParams.entries()].length === 0
              ? url
              : url.includes('?')
                ? `${url}&${overrideParams.toString()}`
                : `${url}?${overrideParams.toString()}`,
          onBeforeLoad(win) {
            options?.onBeforeLoad?.(win)

            setInitialUserState(win, {
              ...initialState,
              ...(options?.userState ?? {}),
            })

            win.ethereum = provider
            win.Cypress.eagerlyConnect = options?.eagerlyConnect ?? true
            win.localStorage.setItem(ALLOW_ANALYTICS_ATOM_KEY, 'true')
          },
        }),
      )
    },
  )

  Cypress.Commands.add('waitForAmplitudeEvent', (eventName, requiredProperties) => {
    function findAndDiscardEventsUpToTarget() {
      const events = Cypress.env('amplitudeEventCache')
      const targetEventIndex = events.findIndex((event) => {
        if (event.event_type !== eventName) {
          return false
        }
        if (requiredProperties) {
          return requiredProperties.every((prop) => event.event_properties[prop])
        }
        return true
      })

      if (targetEventIndex !== -1) {
        const event = events[targetEventIndex]
        Cypress.env('amplitudeEventCache', events.slice(targetEventIndex + 1))
        return cy.wrap(event)
      } else {
        // If not found, retry after waiting for more events to be sent.
        return cy.wait('@amplitude').then(findAndDiscardEventsUpToTarget)
      }
    }
    return findAndDiscardEventsUpToTarget()
  })

  Cypress.Commands.add('interceptGraphqlOperation', (operationName, fixturePath) => {
    return cy.intercept(/(?:interface|beta).gateway.uniswap.org\/v1\/graphql/, (req) => {
      req.headers['origin'] = 'https://app.uniswap.org'
      if (req.body.operationName === operationName) {
        req.reply({ fixture: fixturePath })
      } else {
        req.continue()
      }
    })
  })

  Cypress.Commands.add('interceptQuoteRequest', (fixturePath) => {
    return cy.intercept(/(?:interface|beta).gateway.uniswap.org\/v2\/quote/, (req) => {
      req.headers['origin'] = 'https://app.uniswap.org'
      req.reply({ fixture: fixturePath })
    })
  })
}
