package command

import (
	"context"
	"fmt"
	"io"
	"os"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"golang.org/x/text/language"

	"github.com/zitadel/zitadel/internal/eventstore"
	"github.com/zitadel/zitadel/internal/i18n"
	"github.com/zitadel/zitadel/internal/repository/permission"
	"github.com/zitadel/zitadel/internal/repository/user"
)

var (
	SupportedLanguages   = []language.Tag{language.English, language.German}
	OnlyAllowedLanguages = []language.Tag{language.English}
	AllowedLanguage      = language.English
	DisallowedLanguage   = language.German
	UnsupportedLanguage  = language.Spanish
)

func TestMain(m *testing.M) {
	i18n.SupportLanguages(SupportedLanguages...)
	os.Exit(m.Run())
}

func TestCommands_pushChunked(t *testing.T) {
	aggregate := permission.NewAggregate("instanceID")
	cmds := make([]eventstore.Command, 100)
	for i := 0; i < 100; i++ {
		cmds[i] = permission.NewAddedEvent(context.Background(), aggregate, "role", fmt.Sprintf("permission%d", i))
	}
	type args struct {
		size uint16
	}
	tests := []struct {
		name       string
		args       args
		eventstore func(*testing.T) *eventstore.Eventstore
		wantEvents int
		wantErr    error
	}{
		{
			name: "push error",
			args: args{
				size: 100,
			},
			eventstore: expectEventstore(
				expectPushFailed(io.ErrClosedPipe, cmds...),
			),
			wantEvents: 0,
			wantErr:    io.ErrClosedPipe,
		},
		{
			name: "single chunk",
			args: args{
				size: 100,
			},
			eventstore: expectEventstore(
				expectPush(cmds...),
			),
			wantEvents: len(cmds),
		},
		{
			name: "aligned chunks",
			args: args{
				size: 50,
			},
			eventstore: expectEventstore(
				expectPush(cmds[0:50]...),
				expectPush(cmds[50:100]...),
			),
			wantEvents: len(cmds),
		},
		{
			name: "odd chunks",
			args: args{
				size: 30,
			},
			eventstore: expectEventstore(
				expectPush(cmds[0:30]...),
				expectPush(cmds[30:60]...),
				expectPush(cmds[60:90]...),
				expectPush(cmds[90:100]...),
			),
			wantEvents: len(cmds),
		},
		{
			name: "partial error",
			args: args{
				size: 30,
			},
			eventstore: expectEventstore(
				expectPush(cmds[0:30]...),
				expectPush(cmds[30:60]...),
				expectPushFailed(io.ErrClosedPipe, cmds[60:90]...),
			),
			wantEvents: len(cmds[0:60]),
			wantErr:    io.ErrClosedPipe,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c := &Commands{
				eventstore: tt.eventstore(t),
			}
			gotEvents, err := c.pushChunked(context.Background(), tt.args.size, cmds...)
			require.ErrorIs(t, err, tt.wantErr)
			assert.Len(t, gotEvents, tt.wantEvents)
		})
	}
}

func TestCommands_asyncPush(t *testing.T) {
	// make sure the test terminates on deadlock
	background := context.Background()
	agg := user.NewAggregate("userID", "orgID")
	cmd := user.NewMachineSecretCheckFailedEvent(background, &agg.Aggregate)

	tests := []struct {
		name         string
		pushCtx      func() (context.Context, context.CancelFunc)
		eventstore   func(*testing.T) *eventstore.Eventstore
		closeCtx     func() (context.Context, context.CancelFunc)
		wantCloseErr bool
	}{
		{
			name: "push error",
			pushCtx: func() (context.Context, context.CancelFunc) {
				return context.WithCancel(background)
			},
			eventstore: expectEventstore(
				expectPushFailed(io.ErrClosedPipe, cmd),
			),
			closeCtx: func() (context.Context, context.CancelFunc) {
				return context.WithTimeout(background, time.Second)
			},
			wantCloseErr: false,
		},
		{
			name: "success",
			pushCtx: func() (context.Context, context.CancelFunc) {
				return context.WithCancel(background)
			},
			eventstore: expectEventstore(
				expectPushSlow(time.Second/10, cmd),
			),
			closeCtx: func() (context.Context, context.CancelFunc) {
				return context.WithTimeout(background, time.Second)
			},
			wantCloseErr: false,
		},
		{
			name: "success after push context cancels",
			pushCtx: func() (context.Context, context.CancelFunc) {
				ctx, cancel := context.WithCancel(background)
				cancel()
				return ctx, cancel
			},
			eventstore: expectEventstore(
				expectPushSlow(time.Second/10, cmd),
			),
			closeCtx: func() (context.Context, context.CancelFunc) {
				return context.WithTimeout(background, time.Second)
			},
			wantCloseErr: false,
		},
		{
			name: "success after push context timeout",
			pushCtx: func() (context.Context, context.CancelFunc) {
				return context.WithTimeout(background, time.Second/100)
			},
			eventstore: expectEventstore(
				expectPushSlow(time.Second/10, cmd),
			),
			closeCtx: func() (context.Context, context.CancelFunc) {
				return context.WithTimeout(background, time.Second)
			},
			wantCloseErr: false,
		},
		{
			name: "success after push context timeout",
			pushCtx: func() (context.Context, context.CancelFunc) {
				return context.WithTimeout(background, time.Second/100)
			},
			eventstore: expectEventstore(
				expectPushSlow(time.Second/10, cmd),
			),
			closeCtx: func() (context.Context, context.CancelFunc) {
				return context.WithTimeout(background, time.Second)
			},
			wantCloseErr: false,
		},
		{
			name: "close timeout error",
			pushCtx: func() (context.Context, context.CancelFunc) {
				return context.WithCancel(background)
			},
			eventstore: expectEventstore(
				expectPushSlow(time.Second/10, cmd),
			),
			closeCtx: func() (context.Context, context.CancelFunc) {
				return context.WithTimeout(background, time.Second/100)
			},
			wantCloseErr: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c := &Commands{
				eventstore: tt.eventstore(t),
			}
			c.eventstore.PushTimeout = 10 * time.Second
			pushCtx, cancel := tt.pushCtx()
			c.asyncPush(pushCtx, cmd)
			cancel()

			closeCtx, cancel := tt.closeCtx()
			defer cancel()
			err := c.Close(closeCtx)
			if tt.wantCloseErr {
				assert.Error(t, err)
				return
			}
			require.NoError(t, err)
		})
	}
}