package chain

import (
	"fmt"
	"testing"

	"git.frostfs.info/TrueCloudLab/policy-engine/schema/native"
	"github.com/google/uuid"
	"github.com/stretchr/testify/require"
)

func TestChainMarshalling(t *testing.T) {
	t.Parallel()
	for _, id := range generateTestIDs() {
		for _, rules := range generateTestRules() {
			for _, matchType := range generateTestMatchTypes() {
				performMarshalTest(t, id, rules, matchType)
			}
		}
	}
}

func TestInvalidChainData(t *testing.T) {
	var ch Chain
	require.Error(t, ch.UnmarshalBinary(nil))
	require.Error(t, ch.UnmarshalBinary([]byte{}))
	require.Error(t, ch.UnmarshalBinary([]byte{1, 2, 3}))
	require.Error(t, ch.UnmarshalBinary([]byte("\x00\x00:aws:iam::namespace:group/so\x82\x82\x82\x82\x82\x82u\x82")))
}

func FuzzUnmarshal(f *testing.F) {
	for _, id := range generateTestIDs() {
		for _, rules := range generateTestRules() {
			for _, matchType := range generateTestMatchTypes() {

				chain := Chain{
					ID:        id,
					Rules:     rules,
					MatchType: matchType,
				}
				data, err := chain.MarshalBinary()
				require.NoError(f, err)
				f.Add(data)
			}
		}
	}

	f.Fuzz(func(t *testing.T, data []byte) {
		var ch Chain
		require.NotPanics(t, func() {
			_ = ch.UnmarshalBinary(data)
		})
	})
}

func performMarshalTest(t *testing.T, id ID, r []Rule, mt MatchType) {
	chain := Chain{
		ID:        id,
		Rules:     r,
		MatchType: mt,
	}
	data, err := chain.MarshalBinary()
	require.NoError(t, err)

	var unmarshalledChain Chain
	require.NoError(t, unmarshalledChain.UnmarshalBinary(data))

	require.Equal(t, chain, unmarshalledChain)
}

func generateTestIDs() []ID {
	return []ID{
		ID(""),
		ID(uuid.New().String()),
		ID("*::/"),
		ID("avada kedavra"),
		ID("arn:aws:iam::namespace:group/some_group"),
		ID("$Object:homomorphicHash"),
		ID("native:container/ns/9LPLUFZpEmfidG4n44vi2cjXKXSqWT492tCvLJiJ8W1J"),
	}
}

func generateTestRules() [][]Rule {
	result := [][]Rule{
		nil,
		{},
		{},
	}

	for _, st := range generateTestStatuses() {
		for _, act := range generateTestActions() {
			for _, res := range generateTestResources() {
				for _, cond := range generateTestConditions() {
					result[2] = append(result[2], Rule{
						Status:    st,
						Actions:   act,
						Resources: res,
						Condition: cond,
						Any:       true,
					})
					result[2] = append(result[2], Rule{
						Status:    st,
						Actions:   act,
						Resources: res,
						Condition: cond,
					})
				}
			}
		}
	}

	return result
}

func generateTestStatuses() []Status {
	return []Status{
		Allow,
		NoRuleFound,
		AccessDenied,
		QuotaLimitReached,
	}
}

func generateTestActions() []Actions {
	return []Actions{
		{
			Inverted: true,
			Names:    nil,
		},
		{
			Names: nil,
		},
		{
			Inverted: true,
			Names:    []string{},
		},
		{
			Names: []string{},
		},
		{
			Inverted: true,
			Names:    []string{native.MethodPutObject},
		},
		{
			Names: []string{native.MethodPutObject},
		},
		{
			Inverted: true,
			Names:    []string{native.MethodPutObject, native.MethodDeleteContainer, native.MethodDeleteObject},
		},
		{
			Names: []string{native.MethodPutObject, native.MethodDeleteContainer, native.MethodDeleteObject},
		},
	}
}

func generateTestResources() []Resources {
	return []Resources{
		{
			Inverted: true,
			Names:    nil,
		},
		{
			Names: nil,
		},
		{
			Inverted: true,
			Names:    []string{},
		},
		{
			Names: []string{},
		},
		{
			Inverted: true,
			Names:    []string{native.ResourceFormatAllObjects},
		},
		{
			Names: []string{native.ResourceFormatAllObjects},
		},
		{
			Inverted: true,
			Names: []string{
				native.ResourceFormatAllObjects,
				fmt.Sprintf(native.ResourceFormatRootContainer, "9LPLUFZpEmfidG4n44vi2cjXKXSqWT492tCvLJiJ8W1J"),
			},
		},
		{
			Names: []string{
				native.ResourceFormatAllObjects,
				fmt.Sprintf(native.ResourceFormatRootContainer, "9LPLUFZpEmfidG4n44vi2cjXKXSqWT492tCvLJiJ8W1J"),
			},
		},
	}
}

func generateTestConditions() [][]Condition {
	result := [][]Condition{
		nil,
		{},
		{},
	}

	for _, ct := range generateTestConditionTypes() {
		for _, ot := range generateObjectTypes() {
			result[2] = append(result[2], Condition{
				Op:     ct,
				Object: ot,
				Key:    "",
				Value:  "",
			})

			result[2] = append(result[2], Condition{
				Op:     ct,
				Object: ot,
				Key:    "key",
				Value:  "",
			})

			result[2] = append(result[2], Condition{
				Op:     ct,
				Object: ot,
				Key:    "",
				Value:  "value",
			})

			result[2] = append(result[2], Condition{
				Op:     ct,
				Object: ot,
				Key:    "key",
				Value:  "value",
			})
		}
	}

	return result
}

func generateTestConditionTypes() []ConditionType {
	return []ConditionType{
		CondStringEquals,
		CondStringNotEquals,
		CondStringEqualsIgnoreCase,
		CondStringNotEqualsIgnoreCase,
		CondStringLike,
		CondStringNotLike,
		CondStringLessThan,
		CondStringLessThanEquals,
		CondStringGreaterThan,
		CondStringGreaterThanEquals,
		CondNumericEquals,
		CondNumericNotEquals,
		CondNumericLessThan,
		CondNumericLessThanEquals,
		CondNumericGreaterThan,
		CondNumericGreaterThanEquals,
		CondSliceContains,
	}
}

func generateObjectTypes() []ObjectType {
	return []ObjectType{
		ObjectResource,
		ObjectRequest,
	}
}

func generateTestMatchTypes() []MatchType {
	return []MatchType{
		MatchTypeDenyPriority,
		MatchTypeFirstMatch,
	}
}