package resolver

import (
	"context"
	"time"

	"git.aiterp.net/rpdata/api/internal/session"
	"git.aiterp.net/rpdata/api/model/file"
)

// FileResolver for the File graphql type
type FileResolver struct{ F file.File }

// FileArgs is an arg
type FileArgs struct {
	ID string
}

// File implements the file query
func (r *QueryResolver) File(ctx context.Context, args *FileArgs) (*FileResolver, error) {
	file, err := file.FindID(args.ID)
	if err != nil {
		return nil, err
	}

	return &FileResolver{F: file}, nil
}

// FilesArgs is an arg
type FilesArgs struct {
	IncludePublic *bool
	MimeTypes     *[]string
}

// Files implements the file query
func (r *QueryResolver) Files(ctx context.Context, args *FilesArgs) ([]*FileResolver, error) {
	user := session.FromContext(ctx).User()
	author := ""
	if user != nil {
		author = user.ID
	}

	public := args.IncludePublic != nil && *args.IncludePublic == true

	mimeTypes := []string(nil)
	if args.MimeTypes != nil {
		mimeTypes = *args.MimeTypes
	}

	files, err := file.List(author, public, mimeTypes)
	if err != nil {
		return nil, err
	}

	resolvers := make([]*FileResolver, len(files))
	for i := range files {
		resolvers[i] = &FileResolver{F: files[i]}
	}

	return resolvers, nil
}

// FileEditInput is an input for the editFile mutation
type FileEditInput struct {
	ID     string
	Name   *string
	Public *bool
}

// EditFile resolves the editFile mutation
func (r *MutationResolver) EditFile(ctx context.Context, args *struct{ Input FileEditInput }) (*FileResolver, error) {
	user := session.FromContext(ctx).User()
	if user == nil || !user.Permitted("member") {
		return nil, ErrUnauthorized
	}

	file, err := file.FindID(args.Input.ID)
	if err != nil {
		return nil, err
	}
	if file.Author != user.ID && !user.Permitted("file.edit") {
		return nil, ErrUnauthorized
	}

	err = file.Edit(args.Input.Name, args.Input.Public)
	if err != nil {
		return nil, err
	}

	return &FileResolver{F: file}, nil
}

// RemoveFile resolves the removeFIle mutation
func (r *MutationResolver) RemoveFile(ctx context.Context, args *FileArgs) (*FileResolver, error) {
	user := session.FromContext(ctx).User()
	if user == nil || !user.Permitted("member") {
		return nil, ErrUnauthorized
	}

	file, err := file.FindID(args.ID)
	if err != nil {
		return nil, err
	}
	if file.Author != user.ID && !user.Permitted("file.remove") {
		return nil, ErrUnauthorized
	}

	err = file.Delete()
	if err != nil {
		return nil, err
	}

	return &FileResolver{F: file}, nil
}

// ID resolves File.id
func (f *FileResolver) ID() string {
	return f.F.ID
}

// Author resolves File.author
func (f *FileResolver) Author() string {
	return f.F.Author
}

// Kind resolves File.kind
func (f *FileResolver) Kind() string {
	return f.F.Kind
}

// Time resolves File.time
func (f *FileResolver) Time() string {
	return f.F.Time.Format(time.RFC3339Nano)
}

// Public resolves File.public
func (f *FileResolver) Public() bool {
	return f.F.Public
}

// Name resolves File.name
func (f *FileResolver) Name() string {
	return f.F.Name
}

// MimeType resolves File.mimeType
func (f *FileResolver) MimeType() string {
	return f.F.MimeType
}

// Size resolves File.size
func (f *FileResolver) Size() int32 {
	return int32(f.F.Size)
}

// URL resolves File.url
func (f *FileResolver) URL() *string {
	if f.F.URL == "" {
		return nil
	}

	return &f.F.URL
}