package resolvers

import (
	"context"
	"errors"

	"git.aiterp.net/rpdata/api/graph2/graphcore"
	"git.aiterp.net/rpdata/api/internal/auth"
	"git.aiterp.net/rpdata/api/models"
	"git.aiterp.net/rpdata/api/models/changekeys"
	"git.aiterp.net/rpdata/api/models/changes"
	"git.aiterp.net/rpdata/api/models/logs"
	"git.aiterp.net/rpdata/api/models/posts"
)

// Queries

func (r *queryResolver) Post(ctx context.Context, id string) (*models.Post, error) {
	post, err := posts.FindID(id)
	if err != nil {
		return nil, err
	}

	return &post, nil
}

func (r *queryResolver) Posts(ctx context.Context, filter *posts.Filter) ([]*models.Post, error) {
	// Some sanity checks to avoid querying an insame amount of posts.
	if filter == nil {
		filter = &posts.Filter{Limit: 256}
	} else {
		if (filter.Limit <= 0 || filter.Limit > 256) && filter.LogID == nil {
			return nil, errors.New("a limit of 0 (no limit) or >256 without a logId is not allowed")
		}

		if len(filter.Kind) > 32 {
			return nil, errors.New("You cannot specify more than 32 kinds")
		}

		if len(filter.ID) > 32 {
			return nil, errors.New("You cannot specify more than 32 IDs")
		}
	}

	posts, err := posts.List(filter)
	if err != nil {
		return nil, err
	}

	posts2 := make([]*models.Post, len(posts))
	for i := range posts {
		posts2[i] = &posts[i]
	}

	return posts2, nil
}

// Mutation

func (r *mutationResolver) AddPost(ctx context.Context, input graphcore.PostAddInput) (*models.Post, error) {
	token := auth.TokenFromContext(ctx)
	if !token.Authenticated() || !token.Permitted("post.add") {
		return nil, errors.New("You are not permitted to edit logs")
	}

	log, err := logs.FindID(input.LogID)
	if err != nil {
		return nil, err
	}

	post, err := posts.Add(log, input.Time, input.Kind, input.Nick, input.Text)
	if err != nil {
		return nil, err
	}

	go logs.UpdateCharacters(log, nil)
	go changes.Submit("Post", "add", token.UserID, true, changekeys.Many(log, post), post)

	return &post, nil
}

func (r *mutationResolver) EditPost(ctx context.Context, input graphcore.PostEditInput) (*models.Post, error) {
	token := auth.TokenFromContext(ctx)
	if !token.Authenticated() || !token.Permitted("post.edit") {
		return nil, errors.New("You are not permitted to edit logs")
	}

	post, err := posts.FindID(input.ID)
	if err != nil {
		return nil, errors.New("Post not found")
	}

	if input.Nick != nil {
		go func() {
			log, err := logs.FindID(post.LogID)
			if err != nil {
				return
			}

			logs.UpdateCharacters(log, nil)
		}()
	}

	post, err = posts.Edit(post, input.Time, input.Kind, input.Nick, input.Text)
	if err != nil {
		return nil, errors.New("Adding post failed: " + err.Error())
	}

	go func() {
		log, err := logs.FindID(post.LogID)
		if err != nil {
			log = models.Log{ID: post.LogID}
		}

		changes.Submit("Post", "edit", token.UserID, true, changekeys.Many(log, post), post)
	}()

	return &post, nil
}

func (r *mutationResolver) MovePost(ctx context.Context, input graphcore.PostMoveInput) ([]*models.Post, error) {
	token := auth.TokenFromContext(ctx)
	if !token.Authenticated() || !token.Permitted("post.move") {
		return nil, errors.New("You are not permitted to edit logs")
	}

	post, err := posts.FindID(input.ID)
	if err != nil {
		return nil, errors.New("Post not found")
	}

	posts, err := posts.Move(post, input.ToPosition)
	if err != nil {
		return nil, errors.New("Moving posts failed: " + err.Error())
	}

	go func() {
		log, err := logs.FindID(post.LogID)
		if err != nil {
			log = models.Log{ID: post.LogID}
		}

		changes.Submit("Post", "move", token.UserID, true, changekeys.Many(log, posts), posts)
	}()

	posts2 := make([]*models.Post, len(posts))
	for i := range posts {
		posts2[i] = &posts[i]
	}

	return posts2, nil
}

func (r *mutationResolver) RemovePost(ctx context.Context, input graphcore.PostRemoveInput) (*models.Post, error) {
	token := auth.TokenFromContext(ctx)
	if !token.Authenticated() || !token.Permitted("post.remove") {
		return nil, errors.New("You are not permitted to edit logs")
	}

	post, err := posts.FindID(input.ID)
	if err != nil {
		return nil, errors.New("Post not found (before removing, of course)")
	}

	post, err = posts.Remove(post)
	if err != nil {
		return nil, errors.New("Could not remove post: " + err.Error())
	}

	go func() {
		log, err := logs.FindID(post.LogID)
		if err != nil {
			return
		}

		logs.UpdateCharacters(log, nil)
		changes.Submit("Post", "remove", token.UserID, true, changekeys.Many(log, post), post)
	}()

	return &post, nil
}