//! The delta-feed JSON shapes, exactly as `GET /api/sync/changes` sends them.
//!
//! Mirrors the server's serializers (`notes/serialize.py` + `serialize.py`) — see
//! `docs/sync.md` for the contract. Every field is `#[serde(default)]` or `Option`
//! so a NEWER server adding fields, or an older one omitting one, degrades to a
//! partial note rather than failing the whole page. Losing one attribute is
//! recoverable; refusing a page stalls sync permanently at that cursor.

use serde::Deserialize;

#[derive(Debug, Clone, Deserialize, Default)]
pub struct ChangesPage {
    #[serde(default)]
    pub notes: Vec<Note>,
    #[serde(default)]
    pub labels: Vec<Label>,
    #[serde(default)]
    pub cursor: i64,
    #[serde(default)]
    pub has_more: bool,
}

#[derive(Debug, Clone, Deserialize)]
pub struct Note {
    pub id: String,
    #[serde(default)]
    pub body: String,
    #[serde(default)]
    pub position: i64,
    #[serde(default)]
    pub pinned: bool,
    #[serde(default)]
    pub archived: bool,
    /// The server derives this from `deleted_at` — trash, NOT a tombstone.
    #[serde(default)]
    pub trashed: bool,
    /// WHEN it was trashed. The trash-retention clock runs from here, so it has to be
    /// the server's timestamp rather than anything this device invents. Absent from an
    /// older server, which is why it's optional rather than required.
    #[serde(default)]
    pub deleted_at: Option<String>,
    #[serde(default)]
    pub remind_at: Option<String>,
    #[serde(default)]
    pub recurrence: Option<String>,
    #[serde(default)]
    pub created_at: Option<String>,
    #[serde(default)]
    pub updated_at: Option<String>,
    #[serde(default)]
    pub sync_revision: i64,
    /// Set means the row was permanently purged: a content-less tombstone whose only
    /// job is to tell clients to delete their copy.
    #[serde(default)]
    pub purged_at: Option<String>,
    #[serde(default)]
    pub labels: Vec<NoteLabel>,
    #[serde(default)]
    pub attachments: Vec<Attachment>,
    #[serde(default)]
    pub previews: Vec<Preview>,
}

impl Note {
    pub fn is_tombstone(&self) -> bool {
        self.purged_at.is_some()
    }
}

/// A label as it appears attached to a note. Carries enough to materialize the label
/// row itself, which is what lets a membership be applied even if the label's own
/// delta hasn't arrived (see `pull::apply_page`).
#[derive(Debug, Clone, Deserialize)]
pub struct NoteLabel {
    pub id: String,
    #[serde(default)]
    pub name: String,
    #[serde(default = "default_color")]
    pub color: String,
    /// True when the membership came from a `#tag` in the body rather than a manual
    /// assignment. Applied verbatim rather than re-derived — see `pull::apply_page`.
    #[serde(default)]
    pub via_tag: bool,
}

#[derive(Debug, Clone, Deserialize)]
pub struct Attachment {
    pub id: String,
    #[serde(default)]
    pub url: String,
    #[serde(default)]
    pub filename: Option<String>,
    #[serde(default = "default_mime")]
    pub mime: String,
    #[serde(default)]
    pub size: Option<i64>,
    #[serde(default)]
    pub sha256: Option<String>,
}

#[derive(Debug, Clone, Deserialize)]
pub struct Preview {
    pub id: String,
    #[serde(default)]
    pub url: String,
    #[serde(default)]
    pub title: Option<String>,
    #[serde(default)]
    pub description: Option<String>,
    #[serde(default)]
    pub image_url: Option<String>,
    #[serde(default)]
    pub site_name: Option<String>,
}

#[derive(Debug, Clone, Deserialize)]
pub struct Label {
    pub id: String,
    #[serde(default)]
    pub name: String,
    #[serde(default = "default_color")]
    pub color: String,
    #[serde(default)]
    pub sync_revision: i64,
    #[serde(default)]
    pub purged_at: Option<String>,
    #[serde(default)]
    pub created_at: Option<String>,
}

impl Label {
    pub fn is_tombstone(&self) -> bool {
        self.purged_at.is_some()
    }
}

fn default_color() -> String {
    "default".to_string()
}

fn default_mime() -> String {
    "application/octet-stream".to_string()
}