use chrono::{DateTime, Utc};
use serde::Deserialize;

/// A blob record containing binary data metadata.
#[derive(Debug, Clone, Deserialize)]
pub struct BlobRecord {
    /// The record type
    #[serde(rename = "$type")]
    pub r#type: String,

    /// MIME type of the blob
    #[serde(rename = "mimeType")]
    pub mime_type: String,
    /// Size of the blob in bytes
    pub size: i64,

    /// Reference to the blob content
    #[serde(rename = "ref")]
    pub r#ref: BlobRef,
}

/// A reference to blob content via CID link.
#[derive(Debug, Clone, Deserialize)]
pub struct BlobRef {
    /// The CID link to the blob content
    #[serde(rename = "$link")]
    pub link: String,
}

/// An attachment to a blog post.
#[derive(Debug, Clone, Deserialize)]
pub struct PostAttachment {
    /// The attachment type
    #[serde(rename = "$type")]
    pub r#type: String,

    /// The blob content of the attachment
    pub content: BlobRecord,
}

/// A blog post record from the ATProtocol lexicon.
#[derive(Debug, Clone, Deserialize)]
pub struct PostRecord {
    /// The record type
    #[serde(rename = "$type")]
    pub r#type: String,

    /// Title of the blog post
    pub title: String,
    /// Main content of the blog post
    pub content: BlobRecord,

    /// Publication timestamp
    #[serde(rename = "publishedAt")]
    pub published_at: DateTime<Utc>,

    /// List of attachments to the post
    #[serde(default = "empty_attachments")]
    pub attachments: Vec<PostAttachment>,

    /// Languages used in the post
    pub langs: Vec<String>,
}

fn empty_attachments() -> Vec<PostAttachment> {
    Vec::new()
}