package domain

import (
	"context"
	"fmt"
	"strings"

	"gitlab.com/unboundsoftware/eventsourced/eventsourced"

	"gitea.unbound.se/unboundsoftware/schemas/hash"
)

type AddOrganization struct {
	Name      string
	Initiator string
}

func (a AddOrganization) Validate(_ context.Context, aggregate eventsourced.Aggregate) error {
	if aggregate.Identity() != nil {
		return fmt.Errorf("organization already exists")
	}
	if len(a.Name) == 0 {
		return fmt.Errorf("name is required")
	}
	return nil
}

func (a AddOrganization) Event(context.Context) eventsourced.Event {
	return &OrganizationAdded{
		Name:      a.Name,
		Initiator: a.Initiator,
	}
}

var _ eventsourced.Command = AddOrganization{}

type AddUserToOrganization struct {
	UserId    string
	Initiator string
}

func (a AddUserToOrganization) Validate(_ context.Context, aggregate eventsourced.Aggregate) error {
	if aggregate.Identity() == nil {
		return fmt.Errorf("organization does not exist")
	}
	if len(a.UserId) == 0 {
		return fmt.Errorf("userId is required")
	}
	// Check if user is already in the organization
	org := aggregate.(*Organization)
	for _, user := range org.Users {
		if user == a.UserId {
			return fmt.Errorf("user is already a member of this organization")
		}
	}
	return nil
}

func (a AddUserToOrganization) Event(context.Context) eventsourced.Event {
	return &UserAddedToOrganization{
		UserId:    a.UserId,
		Initiator: a.Initiator,
	}
}

var _ eventsourced.Command = AddUserToOrganization{}

type AddAPIKey struct {
	Name      string
	Key       string
	Refs      []string
	Read      bool
	Publish   bool
	Initiator string
}

func (a AddAPIKey) Validate(_ context.Context, aggregate eventsourced.Aggregate) error {
	if aggregate.Identity() == nil {
		return fmt.Errorf("organization does not exist")
	}
	for _, k := range aggregate.(*Organization).APIKeys {
		if k.Name == a.Name {
			return fmt.Errorf("a key named '%s' already exist", a.Name)
		}
	}
	return nil
}

func (a AddAPIKey) Event(context.Context) eventsourced.Event {
	// Hash the API key using bcrypt for secure storage
	// Note: We can't return an error here, but bcrypt errors are extremely rare
	// (only if system runs out of memory or bcrypt cost is invalid)
	// We use a fixed cost of 12 which is always valid
	hashedKey, err := hash.APIKey(a.Key)
	if err != nil {
		// This should never happen with bcrypt cost 12, but if it does,
		// we'll store an empty hash which will fail validation later
		hashedKey = ""
	}

	return &APIKeyAdded{
		Name:      a.Name,
		Key:       hashedKey,
		Refs:      a.Refs,
		Read:      a.Read,
		Publish:   a.Publish,
		Initiator: a.Initiator,
	}
}

var _ eventsourced.Command = AddAPIKey{}

type RemoveAPIKey struct {
	KeyName   string
	Initiator string
}

func (r RemoveAPIKey) Validate(_ context.Context, aggregate eventsourced.Aggregate) error {
	if aggregate.Identity() == nil {
		return fmt.Errorf("organization does not exist")
	}
	org := aggregate.(*Organization)
	found := false
	for _, k := range org.APIKeys {
		if k.Name == r.KeyName {
			found = true
			break
		}
	}
	if !found {
		return fmt.Errorf("API key '%s' not found", r.KeyName)
	}
	return nil
}

func (r RemoveAPIKey) Event(context.Context) eventsourced.Event {
	return &APIKeyRemoved{
		KeyName:   r.KeyName,
		Initiator: r.Initiator,
	}
}

var _ eventsourced.Command = RemoveAPIKey{}

type RemoveOrganization struct {
	Initiator string
}

func (r RemoveOrganization) Validate(_ context.Context, aggregate eventsourced.Aggregate) error {
	if aggregate.Identity() == nil {
		return fmt.Errorf("organization does not exist")
	}
	return nil
}

func (r RemoveOrganization) Event(context.Context) eventsourced.Event {
	return &OrganizationRemoved{
		Initiator: r.Initiator,
	}
}

var _ eventsourced.Command = RemoveOrganization{}

type UpdateSubGraph struct {
	OrganizationId string
	Ref            string
	Service        string
	Url            *string
	WSUrl          *string
	Sdl            string
	Initiator      string
}

func (u UpdateSubGraph) Validate(_ context.Context, aggregate eventsourced.Aggregate) error {
	switch a := aggregate.(type) {
	case *SubGraph:
		if strings.TrimSpace(u.Ref) == "" {
			return fmt.Errorf("ref is missing")
		}
		if strings.TrimSpace(u.Service) == "" {
			return fmt.Errorf("service is missing")
		}
		if strings.TrimSpace(u.Sdl) == "" {
			return fmt.Errorf("SDL is missing")
		}
		if (u.Url == nil || strings.TrimSpace(*u.Url) == "") && a.Url == nil {
			return fmt.Errorf("url is missing")
		}
	default:
		return fmt.Errorf("aggregate is not a SubGraph")
	}
	return nil
}

func (u UpdateSubGraph) Event(context.Context) eventsourced.Event {
	return &SubGraphUpdated{
		OrganizationId: u.OrganizationId,
		Ref:            u.Ref,
		Service:        u.Service,
		Url:            u.Url,
		WSUrl:          u.WSUrl,
		Sdl:            u.Sdl,
		Initiator:      u.Initiator,
	}
}

var _ eventsourced.Command = UpdateSubGraph{}