package resolvers

// This file will be automatically regenerated based on the schema, any resolver implementations
// will be copied through when generating and any unknown code will be moved to the end.

import (
	"context"
	"errors"
	"git.aiterp.net/stufflog/server/graph/loaders"
	"log"
	"sort"
	"time"

	"git.aiterp.net/stufflog/server/graph/graphcore"
	"git.aiterp.net/stufflog/server/internal/generate"
	"git.aiterp.net/stufflog/server/internal/slerrors"
	"git.aiterp.net/stufflog/server/models"
)

func (r *mutationResolver) CreateProject(ctx context.Context, input graphcore.ProjectCreateInput) (*models.Project, error) {
	user := r.Auth.UserFromContext(ctx)
	if user == nil {
		return nil, slerrors.PermissionDenied
	}

	project := &models.Project{
		ID:          input.ID,
		Name:        input.Name,
		Description: input.Description,
		DailyPoints: input.DailyPoints,
	}
	if !project.ValidKey() {
		return nil, errors.New("the project must have a valid ID (only uppercase allowed)")
	}
	if project.Name == "" || project.Description == "" {
		return nil, errors.New("name and description cannot be left empty")
	}

	project, err := r.Database.Projects().Insert(ctx, *project)
	if err != nil {
		return nil, err
	}

	err = r.Database.Projects().SetPermission(ctx, models.ProjectPermission{
		ProjectID: project.ID,
		UserID:    user.ID,
		Level:     models.ProjectPermissionLevelOwner,
	})

	return project, nil
}

func (r *mutationResolver) CreateActivity(ctx context.Context, input graphcore.ActivityCreateInput) (*models.Activity, error) {
	user := r.Auth.UserFromContext(ctx)
	if user == nil {
		return nil, slerrors.PermissionDenied
	}

	project, err := r.Database.Projects().Find(ctx, input.ProjectID)
	if err != nil {
		return nil, err
	}
	if perm, err := r.Auth.ProjectPermission(ctx, project.ID); err != nil || !perm.CanManageActivities() {
		return nil, slerrors.PermissionDenied
	}

	activity := &models.Activity{
		ProjectID:       project.ID,
		Name:            input.Name,
		Countable:       input.Countable != nil && *input.Countable,
		UnitIsTimeSpent: input.UnitIsTimeSpent != nil && *input.UnitIsTimeSpent,
		BaseValue:       input.BaseValue,
	}
	if !activity.UnitIsTimeSpent && activity.Countable {
		if input.UnitName != nil {
			activity.UnitName = *input.UnitName
		} else {
			return nil, errors.New("unit name is required for countable non-time-spent activities")
		}
	}
	if activity.UnitIsTimeSpent || activity.Countable {
		if input.UnitValue != nil {
			activity.UnitValue = *input.UnitValue
		}
	}

	return r.Database.Activities().Insert(ctx, *activity)
}

func (r *mutationResolver) EditActivity(ctx context.Context, input graphcore.ActivityEditInput) (*models.Activity, error) {
	user := r.Auth.UserFromContext(ctx)
	if user == nil {
		return nil, slerrors.PermissionDenied
	}

	activity, err := r.Database.Activities().Find(ctx, input.ActivityID)
	if err != nil {
		return nil, err
	}

	project, err := r.Database.Projects().Find(ctx, activity.ProjectID)
	if err != nil {
		return nil, err
	}
	if perm, err := r.Auth.ProjectPermission(ctx, project.ID); err != nil || !perm.CanManageActivities() {
		return nil, slerrors.PermissionDenied
	}

	if input.SetName != nil {
		activity.Name = *input.SetName
	}
	if input.SetBaseValue != nil {
		activity.BaseValue = *input.SetBaseValue
	}
	if input.SetUnitName != nil {
		activity.UnitName = *input.SetUnitName
	}
	if input.SetUnitValue != nil {
		activity.UnitValue = *input.SetUnitValue
	}

	err = r.Database.Activities().Save(ctx, *activity)
	if err != nil {
		return nil, err
	}

	return activity, nil
}

func (r *mutationResolver) CreateItem(ctx context.Context, input *graphcore.ItemCreateInput) (*models.Item, error) {
	user := r.Auth.UserFromContext(ctx)
	if user == nil {
		return nil, slerrors.PermissionDenied
	}

	if input.Name == "" {
		return nil, errors.New("name cannot be blank")
	}
	if input.Description == "" {
		return nil, errors.New("name cannot be blank")
	}
	if len(input.Tags) == 0 {
		return nil, errors.New("at least one tag is required")
	}

	item := models.Item{
		Name:         input.Name,
		Description:  input.Description,
		Tags:         input.Tags,
		QuantityUnit: input.QuantityUnit,
		ImageURL:     nil,
	}

	if input.Image != nil {
		url, err := r.Upload.UploadImage(
			ctx,
			"item-image/"+generate.Generate(16, "I"),
			input.Image.ContentType,
			input.Image.Size,
			input.Image.File,
		)
		if err != nil {
			return nil, err
		}

		item.ImageURL = &url
	}

	return r.Database.Items().Insert(ctx, item)
}

func (r *mutationResolver) EditItem(ctx context.Context, input *graphcore.ItemEditInput) (*models.Item, error) {
	user := r.Auth.UserFromContext(ctx)
	if user == nil {
		return nil, slerrors.PermissionDenied
	}

	item, err := r.Database.Items().Find(ctx, input.ItemID)
	if err != nil {
		return nil, err
	}

	deleteList := make([]int, 0, len(input.RemoveTags))
	for _, tag := range input.RemoveTags {
		for i, tag2 := range item.Tags {
			if tag == tag2 {
				deleteList = append(deleteList, i-len(deleteList))
				break
			}
		}
	}
	for _, index := range deleteList {
		item.Tags = append(item.Tags[:index], item.Tags[index+1:]...)
	}
	for _, tag := range input.AddTags {
		found := false
		for _, tag2 := range item.Tags {
			if tag == tag2 {
				found = true
				break
			}
		}
		if !found {
			item.Tags = append(item.Tags, tag)
		}
	}
	sort.Strings(item.Tags)

	if input.SetQuantityUnit != nil {
		item.QuantityUnit = input.SetQuantityUnit
	}
	if input.ClearQuantityUnit != nil && *input.ClearQuantityUnit {
		item.QuantityUnit = nil
	}

	if input.SetName != nil {
		item.Name = *input.SetName
	}
	if input.SetDescription != nil {
		item.Description = *input.SetDescription
	}

	var prevFile *string
	if input.UpdateImage != nil {
		url, err := r.Upload.UploadImage(
			ctx,
			"item-image/"+generate.Generate(16, "U"),
			input.UpdateImage.ContentType,
			input.UpdateImage.Size,
			input.UpdateImage.File,
		)
		if err != nil {
			return nil, err
		}

		prevFile = item.ImageURL
		item.ImageURL = &url
	}

	err = r.Database.Items().Save(ctx, *item)
	if err != nil {
		return nil, err
	}

	if prevFile != nil {
		err := r.Upload.Delete(ctx, *prevFile)
		if err != nil {
			log.Printf("Failed to delete %s: %s", *prevFile, err)
		}
	}

	return item, nil
}

func (r *mutationResolver) CreateIssue(ctx context.Context, input graphcore.IssueCreateInput) (*models.Issue, error) {
	user := r.Auth.UserFromContext(ctx)
	if user == nil {
		return nil, slerrors.PermissionDenied
	}

	project, err := r.Database.Projects().Find(ctx, input.ProjectID)
	if err != nil {
		return nil, err
	}
	if perm, err := r.Auth.ProjectPermission(ctx, project.ID); err != nil || !perm.CanManageOwnIssue() {
		return nil, slerrors.PermissionDenied
	}

	status, err := r.Database.ProjectStatuses().Find(ctx, project.ID, input.StatusName)
	if err != nil {
		return nil, err
	}

	issue := &models.Issue{
		ProjectID:   project.ID,
		OwnerID:     user.ID,
		AssigneeID:  "",
		StatusStage: status.Stage,
		StatusName:  status.Name,
		Name:        input.Name,
		Title:       input.Name, // Title set below if it's in the input.
		Description: input.Description,
	}
	if input.Title != nil && *input.Title != "" {
		issue.Title = *input.Title
	}
	if input.DueTime != nil && !input.DueTime.IsZero() {
		issue.DueTime = *input.DueTime
	}
	if input.AssigneeID != nil && *input.AssigneeID != "" {
		issue.AssigneeID = *input.AssigneeID
	}

	issue, err = r.Database.Issues().Insert(ctx, *issue)
	if err != nil {
		return nil, err
	}

	loaders.IssueLoaderFromContext(ctx).Prime(issue.ID, issue)

	return issue, nil
}

func (r *mutationResolver) CreateIssueTask(ctx context.Context, input graphcore.IssueTaskCreateInput) (*models.IssueTask, error) {
	user := r.Auth.UserFromContext(ctx)
	if user == nil {
		return nil, slerrors.PermissionDenied
	}

	issue, err := loaders.IssueLoaderFromContext(ctx).Load(input.IssueID)
	if err != nil {
		return nil, err
	}
	if perm, err := r.Auth.IssuePermission(ctx, *issue); err != nil || !perm.CanManageOwnIssue() {
		return nil, slerrors.PermissionDenied
	}

	status, err := r.Database.ProjectStatuses().Find(ctx, issue.ProjectID, input.StatusName)
	if err != nil {
		return nil, err
	}

	activity, err := loaders.ActivityLoaderFromContext(ctx).Load(input.ActivityID)
	if err != nil {
		return nil, err
	} else if activity.ProjectID != issue.ProjectID {
		return nil, slerrors.NotFound("Activity")
	}

	issueTask := &models.IssueTask{
		IssueID:          issue.ID,
		ActivityID:       activity.ID,
		CreatedTime:      time.Now(),
		UpdatedTime:      time.Now(),
		StatusStage:      status.Stage,
		StatusName:       status.Name,
		Name:             input.Name,
		Description:      input.Description,
		PointsMultiplier: 1.0,
	}
	if input.EstimatedUnits != nil && activity.Countable && !activity.UnitIsTimeSpent {
		issueTask.EstimatedUnits = *input.EstimatedUnits
	}
	if input.PointsMultiplier != nil && *input.PointsMultiplier > 0 {
		issueTask.PointsMultiplier = *input.PointsMultiplier
	}

	issueTask, err = r.Database.IssueTasks().Insert(ctx, *issueTask)
	if err != nil {
		return nil, err
	}

	return issueTask, nil
}

func (r *mutationResolver) EditIssueTask(ctx context.Context, input graphcore.IssueTaskEditInput) (*models.IssueTask, error) {
	user := r.Auth.UserFromContext(ctx)
	if user == nil {
		return nil, slerrors.PermissionDenied
	}

	task, err := r.Database.IssueTasks().Find(ctx, input.IssueTaskID)
	if err != nil {
		return nil, err
	}

	issue, err := loaders.IssueLoaderFromContext(ctx).Load(task.IssueID)
	if err != nil {
		return nil, err
	}
	if perm, err := r.Auth.IssuePermission(ctx, *issue); err != nil || !perm.CanManageOwnIssue() {
		return nil, slerrors.PermissionDenied
	}

	if input.SetName != nil {
		task.Name = *input.SetName
	}
	if input.SetDescription != nil {
		task.Description = *input.SetDescription
	}
	if input.SetDueTime != nil {
		task.DueTime = input.SetDueTime
	}
	if input.SetEstimatedTime != nil {
		task.EstimatedTime = *input.SetEstimatedTime
	}
	if input.SetEstimatedUnits != nil {
		activity, err := loaders.ActivityLoaderFromContext(ctx).Load(task.ActivityID)
		if err != nil {
			return nil, err
		}

		if activity.Countable && !activity.UnitIsTimeSpent {
			task.EstimatedUnits = *input.SetEstimatedUnits
		}
	}
	if input.SetPointsMultiplier != nil && *input.SetPointsMultiplier > 0 {
		task.PointsMultiplier = *input.SetPointsMultiplier
	}
	if input.SetStatusName != nil {
		status, err := r.Database.ProjectStatuses().Find(ctx, issue.ProjectID, *input.SetStatusName)
		if err != nil {
			return nil, err
		}

		task.StatusName = status.Name
		task.StatusStage = status.Stage
	}

	err = r.Database.IssueTasks().Save(ctx, *task)
	if err != nil {
		return nil, err
	}

	return task, nil
}

func (r *mutationResolver) CreateIssueItem(ctx context.Context, input graphcore.IssueItemCreateInput) (*models.IssueItem, error) {
	user := r.Auth.UserFromContext(ctx)
	if user == nil {
		return nil, slerrors.PermissionDenied
	}

	issue, err := loaders.IssueLoaderFromContext(ctx).Load(input.IssueID)
	if err != nil {
		return nil, err
	}
	if perm, err := r.Auth.IssuePermission(ctx, *issue); err != nil || !perm.CanManageOwnIssue() {
		return nil, slerrors.PermissionDenied
	}

	item, err := r.Database.Items().Find(ctx, input.ItemID)
	if err != nil {
		return nil, err
	}

	issueItem := &models.IssueItem{
		IssueID:  issue.ID,
		ItemID:   item.ID,
		Quantity: input.Quanitty,
		Acquired: input.Acquired != nil && *input.Acquired,
	}

	return r.Database.IssueItems().Insert(ctx, *issueItem)
}

func (r *mutationResolver) EditIssueItem(ctx context.Context, input graphcore.IssueItemEditInput) (*models.IssueItem, error) {
	user := r.Auth.UserFromContext(ctx)
	if user == nil {
		return nil, slerrors.PermissionDenied
	}

	item, err := r.Database.IssueItems().Find(ctx, input.IssueItemID)
	if err != nil {
		return nil, err
	}

	issue, err := loaders.IssueLoaderFromContext(ctx).Load(item.IssueID)
	if err != nil {
		return nil, err
	}
	if perm, err := r.Auth.IssuePermission(ctx, *issue); err != nil || !perm.CanManageOwnIssue() {
		return nil, slerrors.PermissionDenied
	}

	if input.SetAcquired != nil {
		item.Acquired = *input.SetAcquired
	}
	if input.SetQuanitty != nil {
		item.Quantity = *input.SetQuanitty
	}

	err = r.Database.IssueItems().Save(ctx, *item)
	if err != nil {
		return nil, err
	}

	return item, nil
}

func (r *mutationResolver) CreateLog(ctx context.Context, input graphcore.LogCreateInput) (*models.Log, error) {
	user := r.Auth.UserFromContext(ctx)
	if user == nil {
		return nil, slerrors.PermissionDenied
	}

	log := &models.Log{
		UserID:      user.ID,
		Date:        input.Date,
		Description: input.Description,
		Items:       make([]models.LogItem, 0, len(input.Items)),
		Tasks:       make([]models.LogTask, 0, len(input.Tasks)),
	}

	for _, itemInput := range input.Items {
		item, err := r.Database.IssueItems().Find(ctx, itemInput.IssueItemID)
		if err != nil {
			return nil, err
		}

		issue, err := loaders.IssueLoaderFromContext(ctx).Load(item.IssueID)
		if err != nil {
			return nil, err
		}
		_, err = r.Auth.IssuePermission(ctx, *issue)
		if err != nil {
			return nil, err
		}

		log.Items = append(log.Items, models.LogItem{
			IssueID:     item.IssueID,
			IssueItemID: item.ID,
			Amount:      itemInput.Amount,
		})
	}
	for _, taskInput := range input.Tasks {
		task, err := r.Database.IssueTasks().Find(ctx, taskInput.IssueTaskID)
		if err != nil {
			return nil, err
		}

		issue, err := loaders.IssueLoaderFromContext(ctx).Load(task.IssueID)
		if err != nil {
			return nil, err
		}
		_, err = r.Auth.IssuePermission(ctx, *issue)
		if err != nil {
			return nil, err
		}

		log.Tasks = append(log.Tasks, models.LogTask{
			IssueID:     task.IssueID,
			IssueTaskID: task.ID,
			Duration:    taskInput.Duration,
			Units:       taskInput.Units,
		})
	}

	return r.Database.Logs().Insert(ctx, *log)
}

func (r *mutationResolver) EditLog(ctx context.Context, input graphcore.LogEditInput) (*models.Log, error) {
	user := r.Auth.UserFromContext(ctx)
	if user == nil {
		return nil, slerrors.PermissionDenied
	}

	log, err := r.Database.Logs().Find(ctx, input.LogID)
	if err != nil {
		return nil, err
	}

	removeItems := append([]string{}, input.RemoveItems...)
	for _, itemInput := range input.UpdateItems {
		removeItems = append(removeItems, itemInput.IssueItemID)
	}
	removeTasks := append([]string{}, input.RemoveTasks...)
	for _, taskInput := range input.UpdateTasks {
		removeTasks = append(removeTasks, taskInput.IssueTaskID)
	}

	if input.SetDate != nil {
		log.Date = *input.SetDate
	}
	if input.SetDescription != nil {
		log.Description = *input.SetDescription
	}
	for _, remove := range removeItems {
		for i, item := range log.Items {
			if remove == item.IssueItemID {
				log.Items = append(log.Items[:i], log.Items[i+1:]...)
			}
		}
	}
	for _, remove := range removeTasks {
		for i, task := range log.Tasks {
			if remove == task.IssueTaskID {
				log.Tasks = append(log.Tasks[:i], log.Tasks[i+1:]...)
			}
		}
	}

	for _, itemInput := range input.UpdateItems {
		item, err := r.Database.IssueItems().Find(ctx, itemInput.IssueItemID)
		if err != nil {
			return nil, err
		}

		issue, err := loaders.IssueLoaderFromContext(ctx).Load(item.IssueID)
		if err != nil {
			return nil, err
		}
		_, err = r.Auth.IssuePermission(ctx, *issue)
		if err != nil {
			return nil, err
		}

		log.Items = append(log.Items, models.LogItem{
			LogID:       log.ID,
			IssueID:     item.IssueID,
			IssueItemID: item.ID,
			Amount:      itemInput.Amount,
		})
	}
	for _, taskInput := range input.UpdateTasks {
		task, err := r.Database.IssueTasks().Find(ctx, taskInput.IssueTaskID)
		if err != nil {
			return nil, err
		}

		issue, err := loaders.IssueLoaderFromContext(ctx).Load(task.IssueID)
		if err != nil {
			return nil, err
		}
		_, err = r.Auth.IssuePermission(ctx, *issue)
		if err != nil {
			return nil, err
		}

		log.Tasks = append(log.Tasks, models.LogTask{
			LogID:       log.ID,
			IssueID:     task.IssueID,
			IssueTaskID: task.ID,
			Duration:    taskInput.Duration,
			Units:       taskInput.Units,
		})
	}

	err = r.Database.Logs().Save(ctx, *log)
	if err != nil {
		return nil, err
	}

	return log, nil
}

func (r *mutationResolver) LoginUser(ctx context.Context, input graphcore.UserLoginInput) (*models.User, error) {
	return r.Auth.Login(ctx, input.Username, input.Password)
}

func (r *mutationResolver) LogoutUser(ctx context.Context) (*models.User, error) {
	return r.Auth.Logout(ctx)
}

func (r *mutationResolver) CreateUser(ctx context.Context, input graphcore.UserCreateInput) (*models.User, error) {
	active := input.Active == nil || *input.Active
	admin := input.Admin != nil && *input.Admin

	return r.Auth.CreateUser(ctx, input.Username, input.Password, input.Name, active, admin)
}

func (r *mutationResolver) EditUser(ctx context.Context, input graphcore.UserEditInput) (*models.User, error) {
	return r.Auth.EditUser(ctx, input.Username, input.SetName, input.CurrentPassword, input.SetPassword)
}

// Mutation returns graphcore.MutationResolver implementation.
func (r *Resolver) Mutation() graphcore.MutationResolver { return &mutationResolver{r} }

type mutationResolver struct{ *Resolver }