package queries

import (
	"context"
	"errors"
	"time"

	"git.aiterp.net/rpdata/api/graph2/input"
	"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/chapters"
	"git.aiterp.net/rpdata/api/models/comments"
	"git.aiterp.net/rpdata/api/models/stories"
)

// Queries

func (r *resolver) Chapter(ctx context.Context, id string) (*models.Chapter, error) {
	chapter, err := chapters.FindID(id)
	if err != nil {
		return nil, err
	}

	return &chapter, nil
}

// Mutations

func (r *mutationResolver) AddChapter(ctx context.Context, input input.ChapterAddInput) (*models.Chapter, error) {
	story, err := stories.FindID(input.StoryID)
	if err != nil {
		return nil, errors.New("Story not found")
	}

	token := auth.TokenFromContext(ctx)
	if !token.Permitted("member", "story.add") {
		return nil, errors.New("Unauthorized")
	}

	author := token.UserID
	if input.Author != nil && *input.Author != author {
		if !token.Permitted("story.add") {
			return nil, errors.New("False pretender")
		}

		author = *input.Author
	}

	if !story.Open && story.Author != author {
		return nil, errors.New("Story is not open")
	}

	commentMode := models.ChapterCommentModeDisabled
	if input.CommentMode != nil {
		commentMode = *input.CommentMode
	}

	chapter, err := chapters.Add(story, input.Title, author, input.Source, time.Now(), input.FictionalDate, commentMode)
	if err != nil {
		return nil, errors.New("Failed to create chapter: " + err.Error())
	}

	go changes.Submit("Chapter", "add", token.UserID, story.Listed, changekeys.Listed(story, chapter), story, chapter)

	return &chapter, nil
}

func (r *mutationResolver) MoveChapter(ctx context.Context, input input.ChapterMoveInput) (*models.Chapter, error) {
	chapter, err := chapters.FindID(input.ID)
	if err != nil {
		return nil, errors.New("Chapter not found")
	}

	token := auth.TokenFromContext(ctx)
	if !token.Authenticated() || !token.PermittedUser(chapter.Author, "member", "chapter.move") {
		return nil, errors.New("You are not allowed to move this chapter")
	}

	target, err := stories.FindID(input.StoryID)
	if err != nil {
		return nil, errors.New("Target story not found")
	}

	if !target.Open && !token.PermittedUser(target.Author, "member", "chapter.move") {
		return nil, errors.New("You are not permitted to move chapters to this story")
	}

	oldStoryID := chapter.StoryID
	chapter, err = chapters.Move(chapter, target)
	if err != nil {
		return nil, errors.New("Failed to move chapter: " + err.Error())
	}

	go func() {
		story, err := stories.FindID(chapter.StoryID)
		if err != nil {
			story.ID = chapter.StoryID
		}

		oldStory, err := stories.FindID(oldStoryID)
		if err != nil {
			oldStory.ID = oldStoryID
		}

		changes.Submit("Chapter", "move-out", chapter.Author, oldStory.Listed, changekeys.Many(oldStory, chapter), chapter)
		changes.Submit("Chapter", "move-in", token.UserID, story.Listed, changekeys.Listed(story, chapter), story, chapter)
	}()

	return &chapter, nil
}

func (r *mutationResolver) EditChapter(ctx context.Context, input input.ChapterEditInput) (*models.Chapter, error) {
	chapter, err := chapters.FindID(input.ID)
	if err != nil {
		return nil, errors.New("Chapter not found")
	}

	token := auth.TokenFromContext(ctx)
	if !token.Authenticated() || !token.PermittedUser(chapter.Author, "member", "chapter.edit") {
		return nil, errors.New("Unauthorized")
	}

	if input.ClearFictionalDate != nil && *input.ClearFictionalDate == true {
		input.FictionalDate = &time.Time{}
	}

	chapter, err = chapters.Edit(chapter, input.Title, input.Source, input.FictionalDate, input.CommentMode, input.CommentsLocked)
	if err != nil {
		return nil, errors.New("Failed to edit chapter: " + err.Error())
	}

	go func() {
		story, err := stories.FindID(chapter.StoryID)
		if err != nil {
			story.ID = chapter.StoryID
		}

		changes.Submit("Chapter", "edit", token.UserID, story.Listed, changekeys.Many(story, chapter), chapter)
	}()

	return &chapter, nil
}

func (r *mutationResolver) RemoveChapter(ctx context.Context, input input.ChapterRemoveInput) (*models.Chapter, error) {
	chapter, err := chapters.FindID(input.ID)
	if err != nil {
		return nil, errors.New("Chapter not found")
	}

	token := auth.TokenFromContext(ctx)
	if !token.Authenticated() || !token.PermittedUser(chapter.Author, "member", "chapter.remove") {
		return nil, errors.New("Unauthorized")
	}

	chapter, err = chapters.Remove(chapter)
	if err != nil {
		return nil, errors.New("Failed to remove chapter: " + err.Error())
	}

	err = comments.RemoveChapter(chapter)
	if err != nil {
		return nil, errors.New("Chapter was removed, but comment removal failed: " + err.Error())
	}

	go func() {
		story, err := stories.FindID(chapter.StoryID)
		if err != nil {
			story.ID = chapter.StoryID
		}

		changes.Submit("Chapter", "remove", token.UserID, story.Listed, changekeys.Many(story, chapter), chapter)
	}()

	return &chapter, nil
}