package events

import (
	"io"
	"net/url"
	"strings"
)

// Image is a public photo or video already attached to a site post.
type Image struct {
	URL         string
	Description string
	Kind        string
}

// Media is a local upload still held from the create request so Discord can
// attach the bytes. Photos carry re-encoded Bytes; videos carry an open Body.
type Media struct {
	Name        string
	ContentType string
	Kind        string
	Size        int64
	Body        io.ReadCloser
	Bytes       []byte
}

// PostEvent is a Discord-free snapshot of a site post after a successful write.
type PostEvent struct {
	PostID     string
	RootID     string
	ParentID   string
	Title      string
	Body       string
	City       string
	AuthorID   string
	AuthorName string
	AuthorRole string
	Images     []Image
	Permalink  string
}

// PostCreated is emitted after a successful site create.
type PostCreated struct {
	PostEvent
	Media   []Media `json:"-"`
	Release func()  `json:"-"`
}

// PostUpdated is emitted after a successful site edit.
type PostUpdated struct {
	PostEvent
}

// PostedToDiscord is emitted after the Discord subscriber finishes with a
// PostCreated (sent, skipped, or failed). Release deletes held upload files.
type PostedToDiscord struct {
	PostID  string
	Release func() `json:"-"`
}

// Permalink builds /questions/{root}#post-{id}, prefixed by baseURL when set.
func Permalink(baseURL, rootID, postID string) string {
	path := "/questions/" + url.PathEscape(rootID) + "#post-" + url.PathEscape(postID)
	base := strings.TrimRight(strings.TrimSpace(baseURL), "/")
	if base == "" {
		return path
	}
	return base + path
}