package sqlserverflexbeta

import (
	"context"
	"errors"
	"fmt"
	"net/http"
	"strings"
	"time"

	"github.com/hashicorp/terraform-plugin-log/tflog"
	"github.com/stackitcloud/stackit-sdk-go/core/oapierror"
	"github.com/stackitcloud/stackit-sdk-go/core/wait"
	sqlserverflex "tf-provider.git.onstackit.cloud/stackit-dev-tools/terraform-provider-stackitprivatepreview/pkg_gen/sqlserverflexbeta"
)

// READY, PENDING, PROGRESSING, FAILURE, UNKNOWN,
const (
	InstanceStateEmpty       = ""
	InstanceStateSuccess     = "READY"
	InstanceStatePending     = "PENDING"
	InstanceStateProcessing  = "PROGRESSING"
	InstanceStateFailed      = "FAILURE"
	InstanceStateUnknown     = "UNKNOWN"
	InstanceStateTerminating = "TERMINATING"
)

// APIClientInterface Interface needed for tests
type APIClientInterface interface {
	GetInstanceRequestExecute(
		ctx context.Context,
		projectId, region, instanceId string,
	) (*sqlserverflex.GetInstanceResponse, error)
	GetDatabaseRequestExecute(
		ctx context.Context,
		projectId string,
		region string,
		instanceId string,
		databaseName string,
	) (*sqlserverflex.GetDatabaseResponse, error)
	GetUserRequestExecute(
		ctx context.Context,
		projectId string,
		region string,
		instanceId string,
		userId int64,
	) (*sqlserverflex.GetUserResponse, error)
}

// APIClientUserInterface Interface needed for tests
type APIClientUserInterface interface {
	DeleteUserRequestExecute(
		ctx context.Context,
		projectId string,
		region string,
		instanceId string,
		userId int64,
	) error
}

// CreateInstanceWaitHandler will wait for instance creation
func CreateInstanceWaitHandler(
	ctx context.Context,
	a APIClientInterface,
	projectId, instanceId, region string,
) *wait.AsyncActionHandler[sqlserverflex.GetInstanceResponse] {
	handler := wait.New(
		func() (waitFinished bool, response *sqlserverflex.GetInstanceResponse, err error) {
			s, err := a.GetInstanceRequestExecute(ctx, projectId, region, instanceId)
			if err != nil {
				return false, nil, err
			}
			if s == nil || s.Id == nil || *s.Id != instanceId || s.Status == nil {
				return false, nil, nil
			}
			switch strings.ToLower(string(*s.Status)) {
			case strings.ToLower(InstanceStateSuccess):
				if *s.Network.AccessScope == "SNA" {
					if s.Network.InstanceAddress == nil {
						tflog.Info(ctx, "Waiting for instance_address")
						return false, nil, nil
					}
					if s.Network.RouterAddress == nil {
						tflog.Info(ctx, "Waiting for router_address")
						return false, nil, nil
					}
				}
				return true, s, nil
			case strings.ToLower(InstanceStateUnknown), strings.ToLower(InstanceStateFailed):
				return true, s, fmt.Errorf("create failed for instance with id %s", instanceId)
			case strings.ToLower(InstanceStatePending), strings.ToLower(InstanceStateProcessing):
				tflog.Info(
					ctx, "request is being handled", map[string]interface{}{
						"status": *s.Status,
					},
				)
				return false, nil, nil
			default:
				tflog.Info(
					ctx, "Wait (create) received unknown status", map[string]interface{}{
						"instanceId": instanceId,
						"status":     s.Status,
					},
				)
				return false, s, nil
			}
		},
	)
	return handler
}

// UpdateInstanceWaitHandler will wait for instance update
func UpdateInstanceWaitHandler(
	ctx context.Context,
	a APIClientInterface,
	projectId, instanceId, region string,
) *wait.AsyncActionHandler[sqlserverflex.GetInstanceResponse] {
	handler := wait.New(
		func() (waitFinished bool, response *sqlserverflex.GetInstanceResponse, err error) {
			s, err := a.GetInstanceRequestExecute(ctx, projectId, region, instanceId)
			if err != nil {
				return false, nil, err
			}
			if s == nil || s.Id == nil || *s.Id != instanceId || s.Status == nil {
				return false, nil, nil
			}
			switch strings.ToLower(string(*s.Status)) {
			case strings.ToLower(InstanceStateSuccess):
				return true, s, nil
			case strings.ToLower(InstanceStateUnknown), strings.ToLower(InstanceStateFailed):
				return true, s, fmt.Errorf("update failed for instance with id %s", instanceId)
			case strings.ToLower(InstanceStatePending), strings.ToLower(InstanceStateProcessing):
				tflog.Info(
					ctx, "request is being handled", map[string]interface{}{
						"status": *s.Status,
					},
				)
				return false, s, nil
			default:
				tflog.Info(
					ctx, "Wait (update) received unknown status", map[string]interface{}{
						"instanceId": instanceId,
						"status":     s.Status,
					},
				)
				return false, s, nil
			}
		},
	)
	return handler
}

// DeleteInstanceWaitHandler will wait for instance deletion
func DeleteInstanceWaitHandler(
	ctx context.Context,
	a APIClientInterface,
	projectId, instanceId, region string,
) *wait.AsyncActionHandler[sqlserverflex.GetInstanceResponse] {
	handler := wait.New(
		func() (waitFinished bool, response *sqlserverflex.GetInstanceResponse, err error) {
			s, err := a.GetInstanceRequestExecute(ctx, projectId, region, instanceId)
			if err == nil {
				return false, s, nil
			}
			var oapiErr *oapierror.GenericOpenAPIError
			ok := errors.As(err, &oapiErr)
			if !ok {
				return false, nil, fmt.Errorf("could not convert error to oapierror.GenericOpenAPIError")
			}
			if oapiErr.StatusCode != http.StatusNotFound {
				return false, nil, err
			}
			return true, nil, nil
		},
	)
	handler.SetTimeout(30 * time.Minute)
	return handler
}

// CreateDatabaseWaitHandler will wait for instance creation
func CreateDatabaseWaitHandler(
	ctx context.Context,
	a APIClientInterface,
	projectId, instanceId, region, databaseName string,
) *wait.AsyncActionHandler[sqlserverflex.GetDatabaseResponse] {
	handler := wait.New(
		func() (waitFinished bool, response *sqlserverflex.GetDatabaseResponse, err error) {
			s, err := a.GetDatabaseRequestExecute(ctx, projectId, region, instanceId, databaseName)
			if err != nil {
				return false, nil, err
			}
			if s == nil || s.Name == nil || *s.Name != databaseName {
				return false, nil, nil
			}
			var oapiErr *oapierror.GenericOpenAPIError
			ok := errors.As(err, &oapiErr)
			if !ok {
				return false, nil, fmt.Errorf("could not convert error to oapierror.GenericOpenAPIError")
			}
			if oapiErr.StatusCode != http.StatusNotFound {
				return false, nil, err
			}
			return true, nil, nil
		},
	)
	return handler
}

// DeleteUserWaitHandler will wait for instance deletion
func DeleteUserWaitHandler(
	ctx context.Context,
	a APIClientUserInterface,
	projectId, instanceId, region string,
	userId int64,
) *wait.AsyncActionHandler[struct{}] {
	handler := wait.New(
		func() (waitFinished bool, response *struct{}, err error) {
			err = a.DeleteUserRequestExecute(ctx, projectId, region, instanceId, userId)
			if err == nil {
				return false, nil, nil
			}
			var oapiErr *oapierror.GenericOpenAPIError
			ok := errors.As(err, &oapiErr)
			if !ok {
				return false, nil, fmt.Errorf("could not convert error to oapierror.GenericOpenAPIError")
			}

			switch oapiErr.StatusCode {
			case http.StatusNotFound:
				return true, nil, nil
			case http.StatusInternalServerError:
				tflog.Warn(ctx, "Wait handler got error 500")
				return false, nil, nil
			default:
				return false, nil, err
			}
		},
	)
	handler.SetTimeout(15 * time.Minute)
	handler.SetSleepBeforeWait(15 * time.Second)
	return handler
}