package logic

import (
	"context"
	"errors"
	"strings"

	"img_infinite_canvas/internal/domain/design"
	sharingmodule "img_infinite_canvas/internal/modules/sharing"
	"img_infinite_canvas/internal/svc"
	"img_infinite_canvas/internal/types"
)

func ownedShareProject(ctx context.Context, svcCtx *svc.ServiceContext, projectID string) (design.Project, error) {
	return svcCtx.DesignService.GetProject(ctx, strings.TrimSpace(projectID))
}

func verifiedShareOwner(ctx context.Context, svcCtx *svc.ServiceContext, project design.Project) (sharingmodule.Actor, error) {
	if svcCtx.AuthService == nil {
		return sharingmodule.Actor{}, errors.New("auth service is required for share management")
	}
	profile, err := svcCtx.AuthService.GetProfile(ctx, project.UserID)
	if err != nil {
		return sharingmodule.Actor{}, err
	}
	return sharingmodule.Actor{
		Authenticated: true,
		UserID:        project.UserID,
		Email:         profile.Email,
		CountryCode:   profile.CountryCode,
		Phone:         profile.Phone,
		Name:          profile.Name,
		AvatarURL:     profile.AvatarURL,
	}, nil
}

func toShareSettingsResponse(ctx context.Context, svcCtx *svc.ServiceContext, project design.Project, settings sharingmodule.Settings) *types.ShareSettingsResponse {
	owner := types.SharePerson{
		Id:         project.UserID,
		UserId:     project.UserID,
		Name:       "Owner",
		Permission: string(sharingmodule.PermissionOwner),
	}
	ownerActor, ownerErr := verifiedShareOwner(ctx, svcCtx, project)
	if ownerErr == nil {
		owner.Name = firstShareIdentifier(ownerActor.Name, owner.Name)
		owner.AvatarUrl = ownerActor.AvatarURL
		owner.Identifier = firstShareIdentifier(ownerActor.Email, displayPhone(ownerActor.CountryCode, ownerActor.Phone))
	}
	visibleMembers := filterShareMembers(settings.Members, ownerActor)
	members := make([]types.SharePerson, 0, len(visibleMembers))
	for _, member := range visibleMembers {
		members = append(members, types.SharePerson{
			Id:         member.ID,
			Name:       member.Identifier,
			Identifier: member.Identifier,
			Permission: string(member.Permission),
			CreatedAt:  formatTime(member.CreatedAt),
		})
	}
	return &types.ShareSettingsResponse{Settings: types.ShareSettings{
		ProjectId:      project.ID,
		ShareId:        settings.ShareID,
		LinkPermission: string(settings.LinkPermission),
		Owner:          owner,
		Members:        members,
		VisitorCount:   settings.VisitorCount,
		UpdatedAt:      formatTime(settings.UpdatedAt),
	}}
}

func filterShareMembers(members []sharingmodule.Member, owner sharingmodule.Actor) []sharingmodule.Member {
	if owner.UserID == "" {
		return members
	}
	filtered := make([]sharingmodule.Member, 0, len(members))
	for _, member := range members {
		if sharingmodule.ActorOwnsIdentifier(owner, member.Identifier) {
			continue
		}
		filtered = append(filtered, member)
	}
	return filtered
}

func toShareVisitorsResponse(ctx context.Context, svcCtx *svc.ServiceContext, visits []sharingmodule.VisitRecord) *types.ShareVisitorsResponse {
	items := make([]types.ShareVisitor, 0, len(visits))
	for _, visit := range visits {
		item := types.ShareVisitor{
			Id:         visit.ID,
			UserId:     visit.UserID,
			Name:       "Anonymous visitor",
			VisitCount: visit.VisitCount,
			LastSeenAt: formatTime(visit.LastSeenAt),
		}
		if visit.UserID != "" && svcCtx.AuthService != nil {
			if profile, err := svcCtx.AuthService.GetProfile(ctx, visit.UserID); err == nil {
				item.Name = firstShareIdentifier(profile.Name, profile.Email, displayPhone(profile.CountryCode, profile.Phone), "Visitor")
				item.Identifier = firstShareIdentifier(profile.Email, displayPhone(profile.CountryCode, profile.Phone))
				item.AvatarUrl = profile.AvatarURL
			}
		}
		items = append(items, item)
	}
	return &types.ShareVisitorsResponse{Visitors: items}
}

func toShareAccess(access sharingmodule.Access) types.ShareAccess {
	return types.ShareAccess{
		Permission:    string(access.Permission),
		Source:        access.Source,
		Authenticated: access.Authenticated,
		IsOwner:       access.IsOwner,
		Capabilities: types.ShareCapabilities{
			CanViewCanvas: access.Capabilities.CanViewCanvas,
			CanViewChat:   access.Capabilities.CanViewChat,
			CanEdit:       access.Capabilities.CanEdit,
			CanManage:     access.Capabilities.CanManage,
		},
	}
}

func filterSharedProject(project design.Project, access sharingmodule.Access) design.Project {
	project.UserID = ""
	if !access.Capabilities.CanViewChat {
		project.Brief = ""
		project.LastThreadID = ""
		project.Messages = []design.Message{}
	}
	return project
}

func firstShareIdentifier(values ...string) string {
	for _, value := range values {
		if value = strings.TrimSpace(value); value != "" {
			return value
		}
	}
	return ""
}

func displayPhone(countryCode string, phone string) string {
	phone = strings.TrimSpace(phone)
	if phone == "" {
		return ""
	}
	countryCode = strings.TrimPrefix(strings.TrimSpace(countryCode), "+")
	if countryCode == "" || strings.HasPrefix(phone, "+") {
		return phone
	}
	return "+" + countryCode + phone
}