package state

import (
	"errors"

	"github.com/go-ozzo/ozzo-validation/v4"
	"github.com/hashicorp/vagrant-plugin-sdk/proto/vagrant_plugin_sdk"
	"github.com/hashicorp/vagrant/internal/server"
	"github.com/hashicorp/vagrant/internal/server/proto/vagrant_server"
	"gorm.io/gorm"
)

func init() {
	models = append(models, &Project{})
}

type Project struct {
	gorm.Model

	Basis         *Basis
	BasisID       *uint        `gorm:"uniqueIndex:idx_bname;not null" mapstructure:"-"`
	Vagrantfile   *Vagrantfile `mapstructure:"-"`
	VagrantfileID *uint        `mapstructure:"-"`
	DataSource    *ProtoValue
	Jobs          []*InternalJob `gorm:"polymorphic:Scope;"`
	Metadata      MetadataSet
	Name          *string `gorm:"uniqueIndex:idx_bname;not null"`
	Path          *string `gorm:"uniqueIndex;not null"`
	RemoteEnabled bool
	ResourceId    *string `gorm:"<-:create;uniqueIndex;not null"`
	Targets       []*Target
}

func (p *Project) scope() interface{} {
	return p
}

// Set a public ID on the project before creating
func (p *Project) BeforeSave(tx *gorm.DB) error {
	if p.ResourceId == nil {
		if err := p.setId(); err != nil {
			return err
		}
	}
	if err := p.Validate(tx); err != nil {
		return err
	}

	return nil
}

func (p *Project) Validate(tx *gorm.DB) error {
	err := validation.ValidateStruct(p,
		//		validation.Field(&p.Basis, validation.Required),
		validation.Field(&p.Name,
			validation.Required,
			validation.By(
				checkUnique(
					tx.Model(&Project{}).
						Where(&Project{Name: p.Name, BasisID: p.BasisID}).
						Not(&Project{Model: gorm.Model{ID: p.ID}}),
				),
			),
		),
		validation.Field(&p.Path,
			validation.Required,
			validation.By(
				checkUnique(
					tx.Model(&Project{}).
						Where(&Project{Path: p.Path, BasisID: p.BasisID}).
						Not(&Project{Model: gorm.Model{ID: p.ID}}),
				),
			),
		),
		validation.Field(&p.ResourceId,
			validation.Required,
			validation.By(
				checkUnique(
					tx.Model(&Project{}).
						Where(&Project{ResourceId: p.ResourceId}).
						Not(&Project{Model: gorm.Model{ID: p.ID}}),
				),
			),
		),
	)

	if err != nil {
		return err
	}

	return nil
}

func (p *Project) setId() error {
	id, err := server.Id()
	if err != nil {
		return err
	}
	p.ResourceId = &id

	return nil
}

// Convert project to reference protobuf message
func (p *Project) ToProtoRef() *vagrant_plugin_sdk.Ref_Project {
	if p == nil {
		return nil
	}

	ref := vagrant_plugin_sdk.Ref_Project{}
	err := decode(p, &ref)
	if err != nil {
		panic("failed to decode project to ref: " + err.Error())
	}

	return &ref
}

// Convert project to protobuf message
func (p *Project) ToProto() *vagrant_server.Project {
	if p == nil {
		return nil
	}
	var project vagrant_server.Project

	err := decode(p, &project)
	if err != nil {
		panic("failed to decode project: " + err.Error())
	}

	// Manually include the vagrantfile since we force it to be ignored
	if p.Vagrantfile != nil {
		project.Configuration = p.Vagrantfile.ToProto()
	}

	return &project
}

// Load a Project from reference protobuf message.
func (s *State) ProjectFromProtoRef(
	ref *vagrant_plugin_sdk.Ref_Project,
) (*Project, error) {
	if ref == nil {
		return nil, ErrEmptyProtoArgument
	}

	if ref.ResourceId == "" {
		return nil, gorm.ErrRecordNotFound
	}

	var project Project
	result := s.search().First(&project,
		&Project{ResourceId: &ref.ResourceId})
	if result.Error != nil {
		return nil, result.Error
	}

	return &project, nil
}

func (s *State) ProjectFromProtoRefFuzzy(
	ref *vagrant_plugin_sdk.Ref_Project,
) (*Project, error) {
	project, err := s.ProjectFromProtoRef(ref)
	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
		return nil, err
	}

	if ref.Basis == nil {
		return nil, ErrMissingProtoParent
	}

	if ref.Name == "" && ref.Path == "" {
		return nil, gorm.ErrRecordNotFound
	}

	project = &Project{}
	query := &Project{}

	if ref.Name != "" {
		query.Name = &ref.Name
	}
	if ref.Path != "" {
		query.Path = &ref.Path
	}

	result := s.search().
		Joins("Basis", &Basis{ResourceId: &ref.Basis.ResourceId}).
		Where(query).
		First(project)

	if result.Error != nil {
		return nil, result.Error
	}

	return project, nil
}

// Load a Project from protobuf message.
func (s *State) ProjectFromProto(
	p *vagrant_server.Project,
) (*Project, error) {
	if p == nil {
		return nil, ErrEmptyProtoArgument
	}

	project, err := s.ProjectFromProtoRef(
		&vagrant_plugin_sdk.Ref_Project{
			ResourceId: p.ResourceId,
		},
	)

	if err != nil {
		return nil, err
	}

	return project, nil
}

func (s *State) ProjectFromProtoFuzzy(
	p *vagrant_server.Project,
) (*Project, error) {
	if p == nil {
		return nil, ErrEmptyProtoArgument
	}

	project, err := s.ProjectFromProtoRefFuzzy(
		&vagrant_plugin_sdk.Ref_Project{
			ResourceId: p.ResourceId,
			Basis:      p.Basis,
			Name:       p.Name,
			Path:       p.Path,
		},
	)
	if err != nil {
		return nil, err
	}

	return project, nil
}

// Get a project record using a reference protobuf message
func (s *State) ProjectGet(
	p *vagrant_plugin_sdk.Ref_Project,
) (*vagrant_server.Project, error) {
	project, err := s.ProjectFromProtoRef(p)
	if err != nil {
		return nil, lookupErrorToStatus("project", err)
	}

	return project.ToProto(), nil
}

// Store a Project
func (s *State) ProjectPut(
	p *vagrant_server.Project,
) (*vagrant_server.Project, error) {
	project, err := s.ProjectFromProto(p)
	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
		return nil, lookupErrorToStatus("project", err)
	}

	// Make sure we don't have a nil value
	if err != nil {
		project = &Project{}
	}

	err = s.softDecode(p, project)
	if err != nil {
		return nil, saveErrorToStatus("project", err)
	}

	// If a configuration came over the wire, either create one to attach
	// to the project or update the existing one
	if p.Configuration != nil {
		if project.Vagrantfile != nil {
			project.Vagrantfile.UpdateFromProto(p.Configuration)
		} else {
			project.Vagrantfile = s.VagrantfileFromProto(p.Configuration)
		}
	}

	result := s.db.Save(project)
	if result.Error != nil {
		return nil, saveErrorToStatus("project", result.Error)
	}

	return project.ToProto(), nil
}

// List all project records
func (s *State) ProjectList() ([]*vagrant_plugin_sdk.Ref_Project, error) {
	var projects []Project
	result := s.search().Find(&projects)
	if result.Error != nil {
		return nil, lookupErrorToStatus("projects", result.Error)
	}

	prefs := make([]*vagrant_plugin_sdk.Ref_Project, len(projects))
	for i, prj := range projects {
		prefs[i] = prj.ToProtoRef()
	}

	return prefs, nil
}

// Find a Project using a protobuf message
func (s *State) ProjectFind(p *vagrant_server.Project) (*vagrant_server.Project, error) {
	project, err := s.ProjectFromProtoFuzzy(p)
	if err != nil {
		return nil, saveErrorToStatus("project", err)
	}

	return project.ToProto(), nil
}

// Delete a project
func (s *State) ProjectDelete(
	p *vagrant_plugin_sdk.Ref_Project,
) error {
	project, err := s.ProjectFromProtoRef(p)
	// If the record was not found, we return with no error
	if err != nil && errors.Is(err, gorm.ErrRecordNotFound) {
		return nil
	}

	// If an unexpected error was encountered, return it
	if err != nil {
		return deleteErrorToStatus("project", err)
	}

	result := s.db.Delete(project)
	if result.Error != nil {
		return deleteErrorToStatus("project", err)
	}

	return nil
}

var (
	_ scope = (*Project)(nil)
)