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"
	"strings"
	"time"

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

func (r *issueTaskResolver) EstimatedUnits(ctx context.Context, obj *models.IssueTask) (*int, error) {
	// TODO: Data loader
	activity, err := loaders.ActivityLoaderFromContext(ctx).Load(obj.ActivityID)
	if err != nil {
		return nil, err
	}
	if !activity.Countable || activity.UnitIsTimeSpent {
		return nil, nil
	}

	return &obj.EstimatedUnits, nil
}

func (r *issueTaskResolver) Issue(ctx context.Context, obj *models.IssueTask) (*models.Issue, error) {
	return loaders.IssueLoaderFromContext(ctx).Load(obj.IssueID)
}

func (r *issueTaskResolver) Activity(ctx context.Context, obj *models.IssueTask) (*models.Activity, error) {
	return loaders.ActivityLoaderFromContext(ctx).Load(obj.ActivityID)
}

func (r *issueTaskResolver) Status(ctx context.Context, obj *models.IssueTask) (*models.ProjectStatus, error) {
	// The project ID is always the prefix before the first dash in the issue ID.
	split := strings.SplitN(obj.IssueID, "-", 2)
	if len(split) == 0 {
		return nil, errors.New("invalid issue ID")
	}
	projectID := split[0]

	// Shortcut: if description isn't needed, resolve this with issue's properties.
	if !graphutil.SelectsAnyField(ctx, "description") {
		return &models.ProjectStatus{
			ProjectID:   projectID,
			Stage:       obj.StatusStage,
			Name:        obj.StatusName,
			Description: "FAKE",
		}, nil
	}

	// Find it in the database. TODO: DataLoader
	status, err := r.Database.ProjectStatuses().Find(ctx, projectID, obj.StatusName)
	if slerrors.IsNotFound(err) {
		return &models.ProjectStatus{
			ProjectID:   projectID,
			Stage:       obj.StatusStage,
			Name:        obj.StatusName,
			Description: "(Deleted or unknown status)",
		}, nil
	} else if err != nil {
		return nil, err
	}

	// If the stage doesn't match, sneakily correct it for next time.
	if status.Stage != obj.StatusStage {
		updatedTask := *obj
		updatedTask.StatusStage = status.Stage
		_ = r.Database.IssueTasks().Save(ctx, updatedTask)
	}

	return status, nil
}

func (r *issueTaskResolver) RemainingTime(ctx context.Context, obj *models.IssueTask) (time.Duration, error) {
	loader := loaders.LogsByIssueLoaderFromContext(ctx)
	logs, err := loader.Load(obj.IssueID)
	if err != nil {
		return 0, err
	}

	remaining := obj.EstimatedTime
	for _, log := range logs {
		if task := log.Task(obj.ID); task != nil {
			remaining -= task.Duration
		}
	}

	return remaining, nil
}

func (r *issueTaskResolver) RemainingUnits(ctx context.Context, obj *models.IssueTask) (*int, error) {
	activity, err := loaders.ActivityLoaderFromContext(ctx).Load(obj.ActivityID)
	if err != nil {
		return nil, err
	}
	if !activity.Countable || activity.UnitIsTimeSpent {
		return nil, nil
	}

	loader := loaders.LogsByIssueLoaderFromContext(ctx)
	logs, err := loader.Load(obj.IssueID)
	if err != nil {
		return nil, err
	}

	remaining := obj.EstimatedUnits
	for _, log := range logs {
		if task := log.Task(obj.ID); task != nil && task.Units != nil {
			remaining -= *task.Units
		}
	}

	return &remaining, nil
}

// IssueTask returns graphcore.IssueTaskResolver implementation.
func (r *Resolver) IssueTask() graphcore.IssueTaskResolver { return &issueTaskResolver{r} }

type issueTaskResolver struct{ *Resolver }