package mlogger

import (
	"testing"

	"github.com/stretchr/testify/require"
	"go.uber.org/zap"
	"go.uber.org/zap/zaptest/observer"
)

func TestNamedAvoidsLoggerNameStutter(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name string
		base string
		add  []any
		want string
	}{
		{
			name: "skips duplicate service name",
			base: "notification",
			add:  []any{"notification"},
			want: "notification",
		},
		{
			name: "overlaps dotted component",
			base: "vault",
			add:  []any{"vault.kv"},
			want: "vault.kv",
		},
		{
			name: "drops child prefix stutter",
			base: "server.client",
			add:  []any{"client_v2"},
			want: "server.client.v2",
		},
		{
			name: "keeps already present module name",
			base: "payments.quotation.server",
			add:  []any{"payments.quotation"},
			want: "payments.quotation.server",
		},
		{
			name: "extends partial overlap",
			base: "payments",
			add:  []any{"payments.quotation"},
			want: "payments.quotation",
		},
		{
			name: "keeps unrelated names",
			base: "gateway.server",
			add:  []any{"chain", "storage.mongo"},
			want: "gateway.server.chain.storage.mongo",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			observed, logs := observer.New(zap.InfoLevel)
			logger := Named(zap.New(observed).Named(tt.base), tt.add...)
			logger.Info("test")

			entries := logs.All()
			require.Len(t, entries, 1)
			require.Equal(t, tt.want, entries[0].LoggerName)
		})
	}
}