package keeper_test

import (
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/x/distribution/types"
)

func (s *KeeperTestSuite) TestParams() {
	// default params
	communityTax := sdk.NewDecWithPrec(2, 2)        // 2%
	baseProposerReward := sdk.NewDecWithPrec(1, 2)  // 1%
	bonusProposerReward := sdk.NewDecWithPrec(4, 2) // 4%
	withdrawAddrEnabled := true

	testCases := []struct {
		name      string
		input     types.Params
		expErr    bool
		expErrMsg string
	}{
		{
			name: "community tax > 1",
			input: types.Params{
				CommunityTax:        sdk.NewDecWithPrec(2, 0),
				BaseProposerReward:  baseProposerReward,
				BonusProposerReward: bonusProposerReward,
				WithdrawAddrEnabled: withdrawAddrEnabled,
			},
			expErr:    true,
			expErrMsg: "community tax should be non-negative and less than one",
		},
		{
			name: "negative community tax",
			input: types.Params{
				CommunityTax:        sdk.NewDecWithPrec(-2, 1),
				BaseProposerReward:  baseProposerReward,
				BonusProposerReward: bonusProposerReward,
				WithdrawAddrEnabled: withdrawAddrEnabled,
			},
			expErr:    true,
			expErrMsg: "community tax should be non-negative and less than one",
		},
		{
			name: "base proposer reward > 1",
			input: types.Params{
				CommunityTax:        communityTax,
				BaseProposerReward:  sdk.NewDecWithPrec(2, 0),
				BonusProposerReward: bonusProposerReward,
				WithdrawAddrEnabled: withdrawAddrEnabled,
			},
			expErr:    true,
			expErrMsg: "sum of base, bonus proposer rewards, and community tax cannot be greater than one",
		},
		{
			name: "negative base proposer reward",
			input: types.Params{
				CommunityTax:        communityTax,
				BaseProposerReward:  sdk.NewDecWithPrec(-2, 0),
				BonusProposerReward: bonusProposerReward,
				WithdrawAddrEnabled: withdrawAddrEnabled,
			},
			expErr:    true,
			expErrMsg: "base proposer reward should be positive",
		},
		{
			name: "bonus proposer reward > 1",
			input: types.Params{
				CommunityTax:        communityTax,
				BaseProposerReward:  baseProposerReward,
				BonusProposerReward: sdk.NewDecWithPrec(2, 0),
				WithdrawAddrEnabled: withdrawAddrEnabled,
			},
			expErr:    true,
			expErrMsg: "sum of base, bonus proposer rewards, and community tax cannot be greater than one",
		},
		{
			name: "negative bonus proposer reward",
			input: types.Params{
				CommunityTax:        communityTax,
				BaseProposerReward:  baseProposerReward,
				BonusProposerReward: sdk.NewDecWithPrec(-2, 0),
				WithdrawAddrEnabled: withdrawAddrEnabled,
			},
			expErr:    true,
			expErrMsg: "bonus proposer reward should be positive",
		},
		{
			name: "all good",
			input: types.Params{
				CommunityTax:        communityTax,
				BaseProposerReward:  baseProposerReward,
				BonusProposerReward: bonusProposerReward,
				WithdrawAddrEnabled: withdrawAddrEnabled,
			},
			expErr: false,
		},
	}

	for _, tc := range testCases {
		tc := tc
		s.Run(tc.name, func() {
			expected := s.distrKeeper.GetParams(s.ctx)
			err := s.distrKeeper.SetParams(s.ctx, tc.input)

			if tc.expErr {
				s.Require().Error(err)
				s.Require().Contains(err.Error(), tc.expErrMsg)
			} else {
				expected = tc.input
				s.Require().NoError(err)
			}

			params := s.distrKeeper.GetParams(s.ctx)
			s.Require().Equal(expected, params)
		})
	}
}