package snowflake

import "testing"

func FuzzFromString(f *testing.F) {
	s, _ := New()
	f.Add(s.String())
	f.Add("")
	f.Add("0")
	f.Add("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789")

	f.Fuzz(func(t *testing.T, data string) {
		result, err := FromString(data)
		if err != nil {
			return
		}
		if !result.IsZero() {
			roundTrip := result.String()
			parsed, err := FromString(roundTrip)
			if err != nil {
				t.Fatalf("round-trip failed: %v", err)
			}
			if parsed != result {
				t.Fatalf("round-trip mismatch: %v != %v", result, parsed)
			}
		}
	})
}

func FuzzFromHex(f *testing.F) {
	s, _ := New()
	f.Add(s.Hex())
	f.Add("")
	f.Add("00")

	f.Fuzz(func(t *testing.T, data string) {
		result, err := FromHex(data)
		if err != nil {
			return
		}
		roundTrip := result.Hex()
		parsed, err := FromHex(roundTrip)
		if err != nil {
			t.Fatalf("round-trip failed: %v", err)
		}
		if parsed != result {
			t.Fatalf("round-trip mismatch: %v != %v", result, parsed)
		}
	})
}

func FuzzUnmarshalJSON(f *testing.F) {
	s, _ := New()
	serialized, _ := s.MarshalJSON()
	f.Add(string(serialized))
	f.Add(`""`)
	f.Add(`"0"`)

	f.Fuzz(func(t *testing.T, data string) {
		var result Snowflake
		err := result.UnmarshalJSON([]byte(data))
		if err != nil {
			return
		}
		if !result.IsZero() {
			roundTrip, _ := result.MarshalJSON()
			var parsed Snowflake
			if err := parsed.UnmarshalJSON(roundTrip); err != nil {
				t.Fatalf("round-trip failed: %v", err)
			}
			if parsed != result {
				t.Fatalf("round-trip mismatch: %v != %v", result, parsed)
			}
		}
	})
}

func FuzzUnmarshalText(f *testing.F) {
	s, _ := New()
	serialized, _ := s.MarshalText()
	f.Add(string(serialized))
	f.Add("")
	f.Add("0")

	f.Fuzz(func(t *testing.T, data string) {
		var result Snowflake
		err := result.UnmarshalText([]byte(data))
		if err != nil {
			return
		}
		if !result.IsZero() {
			roundTrip, _ := result.MarshalText()
			var parsed Snowflake
			if err := parsed.UnmarshalText(roundTrip); err != nil {
				t.Fatalf("round-trip failed: %v", err)
			}
			if parsed != result {
				t.Fatalf("round-trip mismatch: %v != %v", result, parsed)
			}
		}
	})
}