import * as Action from './Action.js'

const sourceToken = '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913'
const spender = `0x${'44'.repeat(20)}`

function approveCall(amount: bigint): Action.Call {
  return {
    data: `0x095ea7b3${spender.slice(2).padStart(64, '0')}${amount.toString(16).padStart(64, '0')}`,
    to: sourceToken,
    value: '0x0',
  }
}

const depositCall: Action.Call = { data: '0xe8017952', to: spender, value: '0x0' }

describe('validateEvmCalls', () => {
  test('accepts approvals bounded to the route amount', () => {
    Action.validateEvmCalls({
      action: { calls: [approveCall(1_000_000n), depositCall], type: 'evm:calls' },
      sourceAmount: '1000000',
      sourceTokenAddress: sourceToken,
    })
  })

  test('rejects unlimited approvals', () => {
    expect(() =>
      Action.validateEvmCalls({
        action: { calls: [approveCall((1n << 256n) - 1n), depositCall], type: 'evm:calls' },
        sourceAmount: '1000000',
        sourceTokenAddress: sourceToken,
      }),
    ).toThrowErrorMatchingInlineSnapshot(
      `[Funding.Action.InvalidActionError: Approval must stay bounded to the route amount.]`,
    )
  })

  test('rejects approvals above the route amount', () => {
    expect(() =>
      Action.validateEvmCalls({
        action: { calls: [approveCall(1_000_001n)], type: 'evm:calls' },
        sourceAmount: '1000000',
        sourceTokenAddress: sourceToken,
      }),
    ).toThrow(Action.InvalidActionError)
  })

  test('rejects approvals targeting another token', () => {
    expect(() =>
      Action.validateEvmCalls({
        action: {
          calls: [{ ...approveCall(1n), to: `0x${'99'.repeat(20)}` }],
          type: 'evm:calls',
        },
        sourceAmount: '1000000',
        sourceTokenAddress: sourceToken,
      }),
    ).toThrowErrorMatchingInlineSnapshot(
      `[Funding.Action.InvalidActionError: Approval must target the source token.]`,
    )
  })

  test('rejects approval spenders that do not execute a prepared call', () => {
    const attacker = `0x${'99'.repeat(20)}`
    expect(() =>
      Action.validateEvmCalls({
        action: {
          calls: [
            {
              data: `0x095ea7b3${attacker.slice(2).padStart(64, '0')}${(1_000_000).toString(16).padStart(64, '0')}`,
              to: sourceToken,
              value: '0x0',
            },
            depositCall,
          ],
          type: 'evm:calls',
        },
        sourceAmount: '1000000',
        sourceTokenAddress: sourceToken,
      }),
    ).toThrowErrorMatchingInlineSnapshot(
      `[Funding.Action.InvalidActionError: Approval spender must match a later prepared executor.]`,
    )
  })

  test('rejects truncated approval calldata', () => {
    expect(() =>
      Action.validateEvmCalls({
        action: {
          calls: [{ data: '0x095ea7b3', to: sourceToken, value: '0x0' }],
          type: 'evm:calls',
        },
        sourceAmount: '1000000',
        sourceTokenAddress: sourceToken,
      }),
    ).toThrowErrorMatchingInlineSnapshot(
      `[Funding.Action.InvalidActionError: Malformed approval calldata.]`,
    )
  })

  test('rejects odd-length calldata', () => {
    expect(() =>
      Action.validateEvmCalls({
        action: { calls: [{ data: '0x1', to: spender, value: '0x0' }], type: 'evm:calls' },
        sourceAmount: '1000000',
        sourceTokenAddress: sourceToken,
      }),
    ).toThrowErrorMatchingInlineSnapshot(
      `[Funding.Action.InvalidActionError: Malformed EVM calls.]`,
    )
  })

  test('rejects unsupported source token calls', () => {
    expect(() =>
      Action.validateEvmCalls({
        action: {
          calls: [{ data: '0xa9059cbb', to: sourceToken, value: '0x0' }],
          type: 'evm:calls',
        },
        sourceAmount: '1000000',
        sourceTokenAddress: sourceToken,
      }),
    ).toThrowErrorMatchingInlineSnapshot(
      `[Funding.Action.InvalidActionError: Unsupported source token call.]`,
    )
  })

  test('rejects calls carrying native value', () => {
    expect(() =>
      Action.validateEvmCalls({
        action: { calls: [{ ...depositCall, value: '0x1' }], type: 'evm:calls' },
        sourceAmount: '1000000',
        sourceTokenAddress: sourceToken,
      }),
    ).toThrowErrorMatchingInlineSnapshot(
      `[Funding.Action.InvalidActionError: Native value must match a validated provider fee.]`,
    )
  })

  test('accepts an exact provider-validated native value', () => {
    Action.validateEvmCalls({
      action: {
        calls: [approveCall(1_000_000n), { ...depositCall, value: '0x10' }],
        type: 'evm:calls',
      },
      nativeValues: [{ to: spender, value: '0x10' }],
      sourceAmount: '1000000',
      sourceTokenAddress: sourceToken,
    })
  })

  test('rejects malformed native value allowances', () => {
    expect(() =>
      Action.validateEvmCalls({
        action: { calls: [approveCall(1_000_000n), depositCall], type: 'evm:calls' },
        nativeValues: [{ to: spender, value: '10' }],
        sourceAmount: '1000000',
        sourceTokenAddress: sourceToken,
      }),
    ).toThrowErrorMatchingInlineSnapshot(
      `[Funding.Action.InvalidActionError: Malformed native value allowance.]`,
    )
  })

  test('rejects native values outside the exact provider allowance', () => {
    for (const call of [
      { ...depositCall, to: `0x${'99'.repeat(20)}`, value: '0x10' },
      { ...depositCall, value: '0x11' },
    ])
      expect(() =>
        Action.validateEvmCalls({
          action: { calls: [approveCall(1_000_000n), call], type: 'evm:calls' },
          nativeValues: [{ to: spender, value: '0x10' }],
          sourceAmount: '1000000',
          sourceTokenAddress: sourceToken,
        }),
      ).toThrow(Action.InvalidActionError)
  })
})