package query

import (
	"context"
	"errors"
	"queryorchestration/internal/database"
	"queryorchestration/internal/database/repository"
	queryprocessor "queryorchestration/internal/query/processor"
	"testing"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5"
	"github.com/pashagolub/pgxmock/v3"
	"github.com/stretchr/testify/assert"
)

func TestGetUpdator(t *testing.T) {
	pool, err := pgxmock.NewPool()
	if err != nil {
		t.Fatalf("failed to open pgxmock database: %v", err)
	}
	queries := repository.New(pool)
	db := &database.Connection{
		Queries: queries,
		Pool:    pool,
	}
	svc := New(db)

	queryType := queryprocessor.Type(queryprocessor.TypeContextFull)
	updator, err := svc.getUpdator(queryType)
	assert.Nil(t, err)
	assert.NotNil(t, updator)

	queryType = queryprocessor.Type(queryprocessor.TypeJsonExtractor)
	updator, err = svc.getUpdator(queryType)
	assert.Nil(t, err)
	assert.NotNil(t, updator)

	queryType = queryprocessor.Type(-1)
	_, err = svc.getUpdator(queryType)
	assert.NotNil(t, err)
}

func TestSubmitUpdate(t *testing.T) {
	ctx := context.Background()

	pool, err := pgxmock.NewPool()
	if err != nil {
		t.Fatalf("failed to open pgxmock database: %v", err)
	}
	queries := repository.New(pool)
	db := &database.Connection{
		Queries: queries,
		Pool:    pool,
	}
	svc := New(db)

	config := "{\"path\":\"example_path\"}"
	q := Query{
		ID: uuid.New(),
		RequiredQueryIDs: &[]uuid.UUID{
			uuid.New(),
		},
		Config:        &config,
		ActiveVersion: int32(1),
		LatestVersion: int32(2),
	}
	aV := int32(10)
	update := &queryprocessor.Update{
		ID: q.ID,
		RequiredQueryIDs: &[]uuid.UUID{
			uuid.New(),
		},
		Config:        q.Config,
		ActiveVersion: &aV,
	}

	pool.ExpectBeginTx(pgx.TxOptions{})
	pool.ExpectExec("name: AddRequiredQuery :exec").WithArgs(database.MustToDBUUID(update.ID), database.MustToDBUUID((*update.RequiredQueryIDs)[0]), pgxmock.AnyArg()).
		WillReturnResult(pgxmock.NewResult("", 1))
	pool.ExpectExec("name: RemoveRequiredQuery :exec").WithArgs(pgxmock.AnyArg(), database.MustToDBUUID((*q.RequiredQueryIDs)[0]), database.MustToDBUUID(update.ID)).
		WillReturnResult(pgxmock.NewResult("", 1))
	pool.ExpectExec("name: RemoveQueryConfig :exec").WithArgs(pgxmock.AnyArg(), database.MustToDBUUID(update.ID)).
		WillReturnResult(pgxmock.NewResult("", 1))
	pool.ExpectExec("name: AddQueryConfig :exec").WithArgs(database.MustToDBUUID(update.ID), []byte(*update.Config), int32(3)).
		WillReturnResult(pgxmock.NewResult("", 1))
	pool.ExpectExec("name: UpdateQuery :exec").WithArgs(aV, int32(3), database.MustToDBUUID(update.ID)).
		WillReturnResult(pgxmock.NewResult("", 1))
	pool.ExpectCommit()

	err = svc.submitUpdate(ctx, &q, update)
	assert.Nil(t, err)
}

func TestSubmitUpdateRollback(t *testing.T) {
	ctx := context.Background()

	pool, err := pgxmock.NewPool()
	if err != nil {
		t.Fatalf("failed to open pgxmock database: %v", err)
	}
	queries := repository.New(pool)
	db := &database.Connection{
		Queries: queries,
		Pool:    pool,
	}
	svc := New(db)

	q := Query{
		ID:            uuid.New(),
		ActiveVersion: int32(1),
		LatestVersion: int32(2),
	}
	aV := int32(10)
	update := &queryprocessor.Update{
		ID:            q.ID,
		ActiveVersion: &aV,
	}

	pool.ExpectBeginTx(pgx.TxOptions{})
	msg := "database failure"
	pool.ExpectExec("name: UpdateQuery :exec").WithArgs(aV, int32(3), database.MustToDBUUID(update.ID)).
		WillReturnError(errors.New(msg))
	pool.ExpectCommit()

	err = svc.submitUpdate(ctx, &q, update)
	assert.EqualError(t, err, msg)
}

func TestSubmitUpdateRequiredQueries(t *testing.T) {
	ctx := context.Background()

	pool, err := pgxmock.NewPool()
	if err != nil {
		t.Fatalf("failed to open pgxmock database: %v", err)
	}
	queries := repository.New(pool)
	db := &database.Connection{
		Queries: queries,
		Pool:    pool,
	}
	svc := New(db)

	config := "{\"path\":\"example_path\"}"
	q := Query{
		ID: uuid.New(),
		RequiredQueryIDs: &[]uuid.UUID{
			uuid.New(),
			uuid.New(),
			uuid.New(),
		},
		Config:        &config,
		ActiveVersion: int32(1),
		LatestVersion: int32(2),
	}
	update := &queryprocessor.Update{
		ID: q.ID,
		RequiredQueryIDs: &[]uuid.UUID{
			uuid.New(),
			uuid.New(),
			(*q.RequiredQueryIDs)[0],
		},
	}

	pool.ExpectBeginTx(pgx.TxOptions{})
	pool.ExpectExec("name: AddRequiredQuery :exec").WithArgs(database.MustToDBUUID(update.ID), database.MustToDBUUID((*update.RequiredQueryIDs)[0]), pgxmock.AnyArg()).
		WillReturnResult(pgxmock.NewResult("", 1))
	pool.ExpectExec("name: AddRequiredQuery :exec").WithArgs(database.MustToDBUUID(update.ID), database.MustToDBUUID((*update.RequiredQueryIDs)[1]), pgxmock.AnyArg()).
		WillReturnResult(pgxmock.NewResult("", 1))
	pool.ExpectExec("name: RemoveRequiredQuery :exec").WithArgs(pgxmock.AnyArg(), database.MustToDBUUID((*q.RequiredQueryIDs)[1]), database.MustToDBUUID(update.ID)).
		WillReturnResult(pgxmock.NewResult("", 1))
	pool.ExpectExec("name: RemoveRequiredQuery :exec").WithArgs(pgxmock.AnyArg(), database.MustToDBUUID((*q.RequiredQueryIDs)[2]), database.MustToDBUUID(update.ID)).
		WillReturnResult(pgxmock.NewResult("", 1))
	pool.ExpectExec("name: UpdateQuery :exec").WithArgs(q.ActiveVersion, int32(3), database.MustToDBUUID(update.ID)).
		WillReturnResult(pgxmock.NewResult("", 1))
	pool.ExpectCommit()

	err = svc.submitUpdate(ctx, &q, update)
	assert.Nil(t, err)
}

func TestSubmitUpdateActiveVersion(t *testing.T) {
	ctx := context.Background()

	pool, err := pgxmock.NewPool()
	if err != nil {
		t.Fatalf("failed to open pgxmock database: %v", err)
	}
	queries := repository.New(pool)
	db := &database.Connection{
		Queries: queries,
		Pool:    pool,
	}
	svc := New(db)

	q := Query{
		ID:            uuid.New(),
		ActiveVersion: int32(1),
		LatestVersion: int32(2),
	}
	aV := int32(10)
	update := &queryprocessor.Update{
		ID:            q.ID,
		ActiveVersion: &aV,
	}

	pool.ExpectBeginTx(pgx.TxOptions{})
	pool.ExpectExec("name: UpdateQuery :exec").WithArgs(aV, int32(3), database.MustToDBUUID(update.ID)).
		WillReturnResult(pgxmock.NewResult("", 1))
	pool.ExpectCommit()

	err = svc.submitUpdate(ctx, &q, update)
	assert.Nil(t, err)
}

func TestSubmitUpdateNoChange(t *testing.T) {
	ctx := context.Background()

	pool, err := pgxmock.NewPool()
	if err != nil {
		t.Fatalf("failed to open pgxmock database: %v", err)
	}
	queries := repository.New(pool)
	db := &database.Connection{
		Queries: queries,
		Pool:    pool,
	}
	svc := New(db)

	q := Query{
		ID:            uuid.New(),
		ActiveVersion: int32(1),
		LatestVersion: int32(2),
	}
	update := &queryprocessor.Update{
		ID: q.ID,
	}

	pool.ExpectBeginTx(pgx.TxOptions{})
	pool.ExpectRollback()

	err = svc.submitUpdate(ctx, &q, update)
	assert.Nil(t, err)
}

func TestGetSetDifference(t *testing.T) {
	commonUUID := uuid.New()
	listA := []uuid.UUID{uuid.New(), commonUUID}
	listB := []uuid.UUID{uuid.New(), commonUUID}

	assert.ElementsMatch(t, []uuid.UUID{}, getSetDifference(nil, nil))
	assert.ElementsMatch(t, listA, getSetDifference(&listA, nil))
	assert.ElementsMatch(t, []uuid.UUID{}, getSetDifference(nil, &listB))
	assert.ElementsMatch(t, []uuid.UUID{listA[0]}, getSetDifference(&listA, &listB))
	assert.ElementsMatch(t, []uuid.UUID{listB[0]}, getSetDifference(&listB, &listA))
	assert.ElementsMatch(t, []uuid.UUID{}, getSetDifference(&listA, &listA))
}

func TestNormalizeUpdate(t *testing.T) {
	ctx := context.Background()

	pool, err := pgxmock.NewPool()
	if err != nil {
		t.Fatalf("failed to open pgxmock database: %v", err)
	}
	queries := repository.New(pool)
	db := &database.Connection{
		Queries: queries,
		Pool:    pool,
	}
	svc := New(db)

	current := &Query{
		ID:            uuid.New(),
		ActiveVersion: int32(1),
		LatestVersion: int32(2),
		Type:          queryprocessor.TypeJsonExtractor,
	}
	cfg := "{}"
	aV := int32(2)
	update := &queryprocessor.Update{
		ID:               current.ID,
		Config:           &cfg,
		ActiveVersion:    &aV,
		RequiredQueryIDs: &[]uuid.UUID{},
	}

	dbids := database.MustToDBUUIDArray(*update.RequiredQueryIDs)

	pool.ExpectQuery("name: AllQueriesExist :one").WithArgs(dbids).WillReturnRows(
		pgxmock.NewRows([]string{"all_exist"}).
			AddRow(true),
	)

	err = svc.normalizeUpdate(ctx, current, update)
	assert.Nil(t, err)
	assert.EqualExportedValues(t, queryprocessor.Update{
		ID:               current.ID,
		ActiveVersion:    &aV,
		Config:           nil,
		RequiredQueryIDs: nil,
	}, *update)
}