package sentrysetup

import (
	"bytes"
	"errors"
	"fmt"
	"log/slog"
	"strings"
	"testing"

	"github.com/getsentry/sentry-go"
	"github.com/stretchr/testify/assert"
)

func TestSetupSentry(t *testing.T) {
	type args struct {
		releaseName string
		args        SentryConfig
	}
	tests := []struct {
		name       string
		args       args
		init       func(t *testing.T) func(sentry.ClientOptions) error
		wantErr    assert.ErrorAssertionFunc
		wantLogged []string
	}{
		{
			name: "disabled",
			args: args{
				releaseName: "v1.0.0",
				args: SentryConfig{
					DSN:         "https://dsn.example.org/123",
					Environment: "dev",
					Disabled:    true,
				},
			},
			init:       nil,
			wantErr:    assert.NoError,
			wantLogged: []string{`level=INFO msg="Sentry disabled, setup using empty options"`},
		},
		{
			name: "no environment",
			args: args{
				releaseName: "v1.0.0",
				args: SentryConfig{
					DSN:         "https://dsn.example.org/123",
					Environment: "",
					Disabled:    false,
				},
			},
			init: nil,
			wantErr: func(t assert.TestingT, err error, i ...interface{}) bool {
				return assert.EqualError(t, err, "no Sentry environment supplied, exiting")
			},
			wantLogged: []string{},
		},
		{
			name: "illegal environment",
			args: args{
				releaseName: "v1.0.0",
				args: SentryConfig{
					DSN:         "https://dsn.example.org/123",
					Environment: "unknown",
					Disabled:    false,
				},
			},
			init: nil,
			wantErr: func(t assert.TestingT, err error, i ...interface{}) bool {
				return assert.EqualError(t, err, "illegal environment unknown")
			},
			wantLogged: []string{},
		},
		{
			name: "error setting up Sentry",
			args: args{
				releaseName: "v1.0.0",
				args: SentryConfig{
					DSN:         "https://dsn.example.org/123",
					Environment: "development",
					Disabled:    false,
				},
			},
			init: func(t *testing.T) func(sentry.ClientOptions) error {
				return func(options sentry.ClientOptions) error {
					assert.Equal(t, sentry.ClientOptions{
						Dsn:         "https://dsn.example.org/123",
						Debug:       true,
						Release:     "v1.0.0",
						Environment: "development",
					}, options)
					return errors.New("error")
				}
			},
			wantErr: func(t assert.TestingT, err error, i ...interface{}) bool {
				return assert.EqualError(t, err, "sentry setup: error")
			},
			wantLogged: []string{},
		},
		{
			name: "missing DSN for prod-like environment",
			args: args{
				releaseName: "v1.0.0",
				args: SentryConfig{
					DSN:         "",
					Environment: "staging",
					Disabled:    false,
				},
			},
			init: nil,
			wantErr: func(t assert.TestingT, err error, i ...interface{}) bool {
				return assert.EqualError(t, err, "no DSN supplied for non-dev environment, exiting")
			},
			wantLogged: []string{},
		},
		{
			name: "success",
			args: args{
				releaseName: "v1.0.0",
				args: SentryConfig{
					DSN:         "https://dsn.example.org/123",
					Environment: "production",
					Disabled:    false,
				},
			},
			init: func(t *testing.T) func(sentry.ClientOptions) error {
				return func(options sentry.ClientOptions) error {
					assert.Equal(t, sentry.ClientOptions{
						Dsn:              "https://dsn.example.org/123",
						Debug:            false,
						EnableTracing:    true,
						TracesSampleRate: 1,
						Release:          "v1.0.0",
						Environment:      "production",
					}, options)
					return nil
				}
			},
			wantErr:    assert.NoError,
			wantLogged: []string{`level=INFO msg="configured Sentry for env: production"`},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			logged := &bytes.Buffer{}
			logger := &MockLogger{
				logger: slog.New(slog.NewTextHandler(logged, &slog.HandlerOptions{
					ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
						if a.Key == "time" {
							return slog.Attr{}
						}
						return a
					},
				})),
				logged: logged,
			}
			if tt.init == nil {
				sentryInit = sentry.Init
			} else {
				sentryInit = tt.init(t)
			}
			tt.wantErr(t, SetupSentry(logger.Logger(), tt.args.releaseName, tt.args.args), fmt.Sprintf("SetupSentry(%v, %v, %v)", logger, tt.args.releaseName, tt.args.args))
			logger.Check(t, tt.wantLogged)
		})
	}
}

type MockLogger struct {
	logger *slog.Logger
	logged *bytes.Buffer
}

func (m *MockLogger) Logger() *slog.Logger {
	return m.logger
}

func (m *MockLogger) Check(t testing.TB, wantLogged []string) {
	var gotLogged []string
	if m.logged.String() != "" {
		gotLogged = strings.Split(m.logged.String(), "\n")
		gotLogged = gotLogged[:len(gotLogged)-1]
	}
	if len(wantLogged) == 0 {
		assert.Empty(t, gotLogged)
		return
	}
	assert.Equal(t, wantLogged, gotLogged)
}