package mlog

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"strings"
	"testing"
	. "testing"
	"time"

	"github.com/mediocregopher/mediocre-go-lib/v2/internal/massert"
	"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
)

func TestTruncate(t *T) {
	massert.Equal(t, "abc", Truncate("abc", 4))
	massert.Equal(t, "abc", Truncate("abc", 3))
	massert.Equal(t, "ab...", Truncate("abc", 2))
}

func TestJSONLogger(t *T) {
	buf := new(bytes.Buffer)
	now := time.Now().UTC()
	td, ts := now.Format(msgTimeFormat), fmt.Sprint(now.UnixNano())

	l := NewLogger(&LoggerOpts{
		MessageHandler: NewJSONMessageHandler(buf),
		Now:            func() time.Time { return now },
	})

	assertOut := func(t *testing.T, expected string) {
		expected = strings.ReplaceAll(expected, "<TD>", td)
		expected = strings.ReplaceAll(expected, "<TS>", ts)
		out, err := buf.ReadString('\n')
		massert.Equal(t, nil, err)
		massert.Equal(t, expected, strings.TrimSpace(out))
	}

	ctx := context.Background()

	// Default max level should be INFO
	l.Debug(ctx, "foo")
	l.Info(ctx, "bar")
	l.Warn(ctx, "baz", errors.New("ERR"))
	l.Error(ctx, "buz", errors.New("ERR"))
	assertOut(t, `{"td":"<TD>","ts":<TS>,"level":"INFO","descr":"bar","level_int":30}`)
	assertOut(t, `{"td":"<TD>","ts":<TS>,"level":"WARN","descr":"baz","level_int":20,"annotations":{"errMsg":"ERR"}}`)
	assertOut(t, `{"td":"<TD>","ts":<TS>,"level":"ERROR","descr":"buz","level_int":10,"annotations":{"errMsg":"ERR"}}`)

	// annotate context
	ctx = mctx.Annotate(ctx, "foo", "bar")
	l.Info(ctx, "bar")
	assertOut(t, `{"td":"<TD>","ts":<TS>,"level":"INFO","descr":"bar","level_int":30,"annotations":{"foo":"bar"}}`)

	// add namespace
	l = l.WithNamespace("ns")
	l.Info(ctx, "bar")
	assertOut(t, `{"td":"<TD>","ts":<TS>,"level":"INFO","ns":["ns"],"descr":"bar","level_int":30,"annotations":{"foo":"bar"}}`)
}