yandex-tracker-cli 1.0.0

//! Turning Tracker's payloads into our models.
//!
//! Tracker returns most human-readable values as objects with `display`, `key`,
//! `id` and `self` members, and the useful part is not always in the same one.
//! Rather than deriving `Deserialize` against a moving target, we pull out what
//! we render and keep everything else in `extra`, so an upstream addition is
//! carried through instead of breaking the parse (ADR 4).

use serde_json::{Map, Value};

use crate::api::models::{
    Attachment, Change, ChecklistItem, Comment, DictEntry, Entity, FieldChange, Issue, Link,
    LinkKind, Person, RemoteLink, User, Worklog,
};

/// System fields we map explicitly. Anything outside this set is treated as a
/// custom field and lands in `extra`.
const KNOWN: &[&str] = &[
    "key",
    // Counters and bookkeeping Tracker returns on every issue. They are not
    // custom fields, and counting them as such made every issue look like it had
    // several — which is exactly the noise the summary exists to avoid.
    "commentWithExternalMessageCount",
    "votes",
    "votedBy",
    "unique",
    "boards",
    "access",
    "followers",
    "checklistDone",
    "checklistTotal",
    "checklistItems",
    "emailCreatedBy",
    "emailTo",
    "emailFrom",
    "summary",
    "status",
    "type",
    "priority",
    "queue",
    "assignee",
    "createdBy",
    "createdAt",
    "updatedAt",
    "description",
    "commentWithoutExternalMessageCount",
    "id",
    "self",
    "version",
    "aliases",
    "lastCommentUpdatedAt",
    "statusStartTime",
    "updatedBy",
    "previousStatus",
    "previousStatusLastAssignee",
    "favorite",
    "pendingReplyFrom",
];

/// The label of a Tracker reference object: `display` if present, else `key`,
/// else `id`, else the value itself when it is a bare string.
fn label(value: Option<&Value>) -> Option<String> {
    let value = value?;
    if let Some(text) = value.as_str() {
        return Some(text.to_owned());
    }
    for member in ["display", "key", "id"] {
        if let Some(text) = value.get(member).and_then(Value::as_str) {
            return Some(text.to_owned());
        }
    }
    None
}

/// The key of a reference object, falling back to its label.
///
/// Queues are addressed by key everywhere — it is the `PROJ` in `PROJ-1` — so
/// showing the prettier `display` name would print something the caller cannot
/// then type back into another command.
/// The stable key of a referenced object, and nothing else.
///
/// Unlike [`key_label`] this does not fall back to a display name: half a
/// vocabulary is worse than none, since a caller matching on `closed` would
/// silently start matching a localised word that happens to be there.
fn key_of(value: Option<&Value>) -> Option<String> {
    value?
        .get("key")
        .and_then(Value::as_str)
        .map(ToOwned::to_owned)
}

fn key_label(value: Option<&Value>) -> Option<String> {
    let value = value?;
    if let Some(key) = value.get("key").and_then(Value::as_str) {
        return Some(key.to_owned());
    }
    label(Some(value))
}

fn user(value: Option<&Value>) -> Option<User> {
    let value = value?;
    Some(User {
        id: value
            .get("id")
            .and_then(Value::as_str)
            .unwrap_or_default()
            .to_owned(),
        login: value
            .get("login")
            .and_then(Value::as_str)
            .map(ToOwned::to_owned),
        display: value
            .get("display")
            .and_then(Value::as_str)
            .map(ToOwned::to_owned),
    })
}

/// Parse a Tracker timestamp.
///
/// The API emits offsets as `+0300` rather than `+03:00`, which is valid ISO 8601
/// but not what a strict RFC 3339 parser accepts, so the compact form is widened
/// before parsing. An unparseable date is dropped rather than failing the whole
/// issue: a missing `updated` line is a much smaller problem than a command that
/// refuses to show an issue at all.
fn timestamp(value: Option<&Value>) -> Option<jiff::Timestamp> {
    let text = value?.as_str()?;

    if let Ok(parsed) = text.parse::<jiff::Timestamp>() {
        return Some(parsed);
    }

    let widened = widen_offset(text);
    match widened.parse::<jiff::Timestamp>() {
        Ok(parsed) => Some(parsed),
        Err(error) => {
            tracing::debug!(%text, %error, "unparseable timestamp, omitted");
            None
        }
    }
}

/// `2026-08-27T10:00:00.000+0300` -> `2026-08-27T10:00:00.000+03:00`.
fn widen_offset(text: &str) -> String {
    let bytes = text.as_bytes();
    let Some(sign_at) = bytes
        .iter()
        .rposition(|byte| *byte == b'+' || *byte == b'-')
    else {
        return text.to_owned();
    };

    // Only the trailing `±HHMM` form needs widening, and only when it really is
    // a four-digit offset rather than part of the date.
    let offset = &text[sign_at + 1..];
    if offset.len() != 4 || !offset.bytes().all(|byte| byte.is_ascii_digit()) {
        return text.to_owned();
    }

    format!("{}{}:{}", &text[..=sign_at], &offset[..2], &offset[2..])
}

/// Map a link type id and our side of it onto our vocabulary.
///
/// Keyed on `type.id`, which is stable and English, rather than on the
/// `inward`/`outward` labels, which come back in the organisation's language —
/// a Russian-locale organisation answers "Связана", and an English word list
/// silently turns every link into "links".
///
/// `direction` says which end we are on, and the rule is one rule: the kind has
/// to mean what Tracker's own label for *our* side means. `subtask` outward is
/// labelled "родительская задача" — we are the parent, so the other issue is
/// the subtask; `depends` outward is labelled "зависит от" — we are the one
/// that depends.
///
/// The `depends` pair was the wrong way round until a round trip against a real
/// organisation caught it, and nothing else could have: written from one end
/// the wrong mapping is self-consistent, and the fixtures were written from the
/// same belief as the code. Both ends, or it proves nothing.
fn link_kind(type_id: &str, inward: bool) -> LinkKind {
    match (type_id, inward) {
        ("subtask", true) => LinkKind::Parent,
        ("subtask", false) => LinkKind::Subtask,
        ("depends", true) => LinkKind::IsDependentBy,
        ("depends", false) => LinkKind::Depends,
        ("duplicates" | "duplicate", true) => LinkKind::Duplicates,
        ("duplicates" | "duplicate", false) => LinkKind::IsDuplicatedBy,
        ("epic", true) => LinkKind::HasEpic,
        ("epic", false) => LinkKind::Epic,
        ("relates", _) => LinkKind::Relates,
        _ => LinkKind::Other,
    }
}

/// Parse one entry of `GET /v3/issues/{key}/links`.
#[must_use]
pub fn link(value: &Value) -> Option<Link> {
    let object = value.get("object")?;
    let kind_object = value.get("type");
    let inward = value.get("direction").and_then(Value::as_str) == Some("inward");

    let type_id = kind_object
        .and_then(|kind| kind.get("id"))
        .and_then(Value::as_str)
        .unwrap_or_default();

    // Tracker's own wording for our side of the link, kept for the types we do
    // not recognise so the output still says something true.
    let relation = kind_object
        .and_then(|kind| kind.get(if inward { "inward" } else { "outward" }))
        .and_then(Value::as_str)
        .map(str::to_lowercase);

    Some(Link {
        // A number on the wire in some organisations, a string in others, and
        // absent only in a payload we have never seen. A link with no id is
        // still a link: dropping the row would make it invisible, and this
        // command exists so that invisible and absent are not the same thing.
        id: match value.get("id") {
            Some(Value::String(id)) => id.clone(),
            Some(other) => other.to_string(),
            None => String::new(),
        },
        kind: link_kind(type_id, inward),
        relation,
        key: object.get("key").and_then(Value::as_str)?.to_owned(),
        summary: label(object.get("display")),
        status: label(object.get("status")),
    })
}

/// One link out of Tracker.
///
/// Everything but the id is optional on purpose: the object at the far end is
/// described by an application we know nothing about, and a link whose payload
/// is thinner than the documented shape is still a link worth printing.
#[must_use]
pub fn remote_link(value: &Value) -> Option<RemoteLink> {
    let object = value.get("object");
    let inward = value.get("direction").and_then(Value::as_str) == Some("inward");

    Some(RemoteLink {
        id: match value.get("id")? {
            Value::String(id) => id.clone(),
            other => other.to_string(),
        },
        relation: value
            .get("type")
            .and_then(|kind| {
                kind.get(if inward { "inward" } else { "outward" })
                    .or_else(|| kind.get("id"))
            })
            .and_then(Value::as_str)
            .map(str::to_lowercase),
        application: object
            .and_then(|object| object.get("application"))
            .and_then(|app| app.get("name").or_else(|| app.get("id")))
            .and_then(Value::as_str)
            .map(ToOwned::to_owned),
        key: object
            .and_then(|object| object.get("key"))
            .and_then(Value::as_str)
            .map(ToOwned::to_owned),
        title: label(object.and_then(|object| object.get("display"))),
    })
}

/// Parse one project, portfolio or goal.
///
/// Everything worth showing sits under `fields`; the envelope carries only
/// identity.
#[must_use]
pub fn entity(value: &Value) -> Option<Entity> {
    let fields = value.get("fields");
    let field = |name: &str| fields.and_then(|fields| fields.get(name));

    Some(Entity {
        id: value.get("id").and_then(Value::as_str)?.to_owned(),
        short_id: value.get("shortId").and_then(Value::as_i64),
        entity_type: value
            .get("entityType")
            .and_then(Value::as_str)
            .map(ToOwned::to_owned),
        summary: field("summary")
            .and_then(Value::as_str)
            .unwrap_or_default()
            .to_owned(),
        status: label(field("entityStatus")),
        lead: user(field("lead")),
        start: field("start")
            .and_then(Value::as_str)
            .map(ToOwned::to_owned),
        end: field("end").and_then(Value::as_str).map(ToOwned::to_owned),
        description: field("description")
            .and_then(Value::as_str)
            .map(ToOwned::to_owned),
        parent: parent_entity(field("parentEntity")),
        version: value.get("version").and_then(Value::as_u64),
    })
}

/// The id out of `parentEntity`, in whichever shape it arrives.
///
/// Writes take an object (`{"primary": id, "secondary": [...]}`), and reads have
/// been seen to answer with the bare id. Both are accepted rather than guessed
/// at, because an entity whose parent silently reads as absent is worse than one
/// that costs a few lines here.
fn parent_entity(value: Option<&Value>) -> Option<String> {
    fn id_of(value: &Value) -> Option<String> {
        match value {
            Value::String(id) => Some(id.clone()),
            Value::Number(id) => Some(id.to_string()),
            // A read answers `{"primary": {"id": …, "display": …}}`; a write
            // takes `{"primary": "<id>"}`. Both arrive here.
            Value::Object(map) => map.get("id").and_then(id_of),
            _ => None,
        }
    }

    match value? {
        Value::Object(map) => map.get("primary").and_then(id_of),
        other => id_of(other),
    }
}

/// Parse one entry of `GET /v3/issues/{key}/attachments`.
#[must_use]
pub fn attachment(value: &Value) -> Option<Attachment> {
    Some(Attachment {
        id: match value.get("id")? {
            Value::String(text) => text.clone(),
            other => other.to_string(),
        },
        name: value
            .get("name")
            .and_then(Value::as_str)
            .unwrap_or_default()
            .to_owned(),
        size: value.get("size").and_then(Value::as_u64),
        mimetype: value
            .get("mimetype")
            .and_then(Value::as_str)
            .map(ToOwned::to_owned),
        author: user(value.get("createdBy")),
        created_at: timestamp(value.get("createdAt")),
        content: value
            .get("content")
            .and_then(Value::as_str)
            .map(ToOwned::to_owned),
    })
}

/// Parse one entry of `GET /v3/issues/{key}/comments`.
#[must_use]
pub fn comment(value: &Value) -> Option<Comment> {
    Some(Comment {
        id: value
            .get("id")
            .map(|id| match id {
                Value::String(text) => text.clone(),
                other => other.to_string(),
            })
            .unwrap_or_default(),
        text: value
            .get("text")
            .and_then(Value::as_str)
            .unwrap_or_default()
            .to_owned(),
        author: user(value.get("createdBy")),
        created_at: timestamp(value.get("createdAt")),
    })
}

/// Parse one entry of `GET /v3/issues/{key}/worklog`.
#[must_use]
pub fn worklog(value: &Value) -> Option<Worklog> {
    Some(Worklog {
        id: identifier(value.get("id"))?,
        duration: value
            .get("duration")
            .and_then(Value::as_str)
            .unwrap_or_default()
            .to_owned(),
        author: user(value.get("createdBy")),
        start: timestamp(value.get("start")),
        comment: value
            .get("comment")
            .and_then(Value::as_str)
            .map(str::to_owned),
        issue: key_label(value.get("issue")),
    })
}

/// Parse one entry of `GET /v3/issues/{key}/checklistItems`.
#[must_use]
pub fn checklist_item(value: &Value) -> Option<ChecklistItem> {
    Some(ChecklistItem {
        id: identifier(value.get("id"))?,
        text: value
            .get("text")
            .and_then(Value::as_str)
            .unwrap_or_default()
            .to_owned(),
        checked: value
            .get("checked")
            .and_then(Value::as_bool)
            .unwrap_or(false),
        assignee: user(value.get("assignee")),
        deadline: value
            .get("deadline")
            .and_then(|deadline| deadline.get("date").or(Some(deadline)))
            .and_then(Value::as_str)
            .map(str::to_owned),
    })
}

/// An id, whether Tracker sent it as a string or a number.
///
/// Worklog and checklist ids come back as numbers on some endpoints and strings
/// on others, and a caller passes whichever they were given straight back.
fn identifier(value: Option<&Value>) -> Option<String> {
    match value? {
        Value::String(text) => Some(text.clone()),
        Value::Number(number) => Some(number.to_string()),
        _ => None,
    }
}

/// The name a caller can actually type for a custom field.
///
/// Tracker returns them prefixed with the queue's opaque id —
/// `603bd9b6cdc7ba0d2f4b1a55--component` — and accepts the trailing segment
/// back. `queue fields` has always printed the short form; the issue view
/// printed the raw one, which meant the line whose whole purpose is to say what
/// to ask for next named a key `--fields` would not take.
fn custom_field_key(key: &str) -> String {
    key.rsplit("--").next().unwrap_or(key).to_owned()
}

/// Parse `GET /v3/issues/{key}` (or one element of a search result).
///
/// Returns `None` only when the payload has no key, which means it is not an
/// issue at all.
#[must_use]
pub fn issue(value: &Value) -> Option<Issue> {
    let object = value.as_object()?;

    let mut extra = Map::new();
    for (key, member) in object {
        if KNOWN.contains(&key.as_str()) {
            continue;
        }
        // A custom field that is set to nothing is not worth counting: it would
        // inflate the "N set" summary with fields nobody filled in.
        if member.is_null() {
            continue;
        }
        let key = custom_field_key(key);
        if let Some(text) = label(Some(member)) {
            extra.insert(key, Value::String(text));
        } else {
            extra.insert(key, member.clone());
        }
    }

    Some(Issue {
        key: object.get("key")?.as_str()?.to_owned(),
        summary: object
            .get("summary")
            .and_then(Value::as_str)
            .unwrap_or_default()
            .to_owned(),
        status: label(object.get("status")),
        status_key: key_of(object.get("status")),
        issue_type: label(object.get("type")),
        priority: label(object.get("priority")),
        priority_key: key_of(object.get("priority")),
        queue: key_label(object.get("queue")),
        assignee: user(object.get("assignee")),
        author: user(object.get("createdBy")),
        created_at: timestamp(object.get("createdAt")),
        updated_at: timestamp(object.get("updatedAt")),
        description: object
            .get("description")
            .and_then(Value::as_str)
            .map(ToOwned::to_owned),
        links: Vec::new(),
        comment_count: object
            .get("commentWithoutExternalMessageCount")
            .and_then(Value::as_u64)
            .and_then(|count| u32::try_from(count).ok()),
        extra,
    })
}

/// One entry of the changelog.
#[must_use]
pub fn change(value: &Value) -> Option<Change> {
    let fields = value
        .get("fields")
        .and_then(Value::as_array)
        .map(|entries| entries.iter().filter_map(field_change).collect())
        .unwrap_or_default();

    Some(Change {
        id: identifier(value.get("id"))?,
        at: timestamp(value.get("updatedAt")),
        by: user(value.get("updatedBy")),
        kind: value
            .get("type")
            .and_then(Value::as_str)
            .unwrap_or("change")
            .to_owned(),
        fields,
    })
}

fn field_change(value: &Value) -> Option<FieldChange> {
    // The field's id, not its display name, and for the same reason `dict list`
    // prints keys: `Статус` is what a Russian organisation calls it, `status` is
    // what `--set` and `--fields` take. Custom fields arrive prefixed with the
    // queue id, and the trailing segment is the part a caller can type.
    let field = value
        .get("field")
        .and_then(|field| field.get("id"))
        .and_then(Value::as_str)
        .map(custom_field_key)
        .or_else(|| label(value.get("field")))?;

    Some(FieldChange {
        field,
        from: changed_value(value.get("from")),
        to: changed_value(value.get("to")),
    })
}

/// One side of a change, as one line of text.
///
/// A field's value can be a reference object, a bare scalar or a list of either
/// — tags and followers arrive as arrays — and all three have to render as
/// something a person can compare against the other side. `null` becomes
/// `None`: on a creation there is no before, and that is not the same as a
/// field whose value is the word "null".
fn changed_value(value: Option<&Value>) -> Option<String> {
    match value? {
        Value::Null => None,
        Value::Bool(flag) => Some(flag.to_string()),
        Value::Number(number) => Some(number.to_string()),
        Value::Array(entries) => {
            let joined: Vec<String> = entries
                .iter()
                .filter_map(|entry| changed_value(Some(entry)))
                .collect();
            (!joined.is_empty()).then(|| joined.join(", "))
        }
        // A reference whose only member is a numeric id — board membership
        // arrives as `[{"id": 1}]` — still has to render as something, or the
        // line claims nothing changed when something did.
        other => label(Some(other)).or_else(|| identifier(other.get("id"))),
    }
}

/// One entry of an issue type, priority, status or resolution listing.
///
/// Without a `key` the entry is useless for the purpose it is listed for — a
/// write quotes the key — so an entry that has none is dropped rather than
/// printed as a row nobody can act on.
#[must_use]
pub fn dict_entry(value: &Value) -> Option<DictEntry> {
    Some(DictEntry {
        key: value.get("key").and_then(Value::as_str)?.to_owned(),
        name: value
            .get("name")
            .and_then(Value::as_str)
            .unwrap_or_default()
            .to_owned(),
        description: value
            .get("description")
            .and_then(Value::as_str)
            .filter(|text| !text.is_empty())
            .map(ToOwned::to_owned),
        order: value.get("order").and_then(Value::as_i64),
        category: value
            .get("type")
            .and_then(Value::as_str)
            .map(ToOwned::to_owned),
    })
}

/// One directory record.
///
/// `display` is assembled by Tracker from the first and last name and is what
/// a person is called in every other answer, so it is preferred over
/// re-assembling it here. An account with neither falls back to its login,
/// because a blank column reads as a bug.
#[must_use]
pub fn person(value: &Value) -> Option<Person> {
    let login = value.get("login").and_then(Value::as_str)?.to_owned();
    let display = value
        .get("display")
        .and_then(Value::as_str)
        .filter(|text| !text.trim().is_empty())
        .unwrap_or(&login)
        .to_owned();

    Some(Person {
        uid: identifier(value.get("uid")).unwrap_or_default(),
        display,
        email: value
            .get("email")
            .and_then(Value::as_str)
            .filter(|text| !text.is_empty())
            .map(ToOwned::to_owned),
        dismissed: value
            .get("dismissed")
            .and_then(Value::as_bool)
            .unwrap_or(false),
        external: value
            .get("external")
            .and_then(Value::as_bool)
            .unwrap_or(false),
        login,
    })
}

#[cfg(test)]
#[allow(clippy::expect_used)]
mod tests {
    use super::*;

    #[test]
    fn reference_objects_collapse_to_their_display_name() {
        let value = serde_json::json!({"display": "In Progress", "key": "inProgress"});
        assert_eq!(label(Some(&value)).as_deref(), Some("In Progress"));
    }

    #[test]
    fn a_reference_without_a_display_falls_back_to_its_key() {
        let value = serde_json::json!({"key": "PROJ", "id": "7"});
        assert_eq!(label(Some(&value)).as_deref(), Some("PROJ"));
    }

    /// Tracker writes offsets as `+0300`; a strict RFC 3339 parser wants `+03:00`.
    #[test]
    fn compact_offsets_are_widened_before_parsing() {
        let value = serde_json::json!("2026-08-27T10:00:00.000+0300");
        let parsed = timestamp(Some(&value)).expect("parsed");
        assert_eq!(parsed.to_string(), "2026-08-27T07:00:00Z");
    }

    #[test]
    fn utc_timestamps_parse_unchanged() {
        let value = serde_json::json!("2026-08-27T10:00:00Z");
        assert!(timestamp(Some(&value)).is_some());
    }

    /// A date we cannot read costs one line of output. Refusing to show the
    /// issue would cost the whole command.
    #[test]
    fn an_unparseable_date_is_dropped_not_fatal() {
        let value = serde_json::json!("yesterday");
        assert!(timestamp(Some(&value)).is_none());
    }

    #[test]
    fn unknown_members_become_custom_fields_and_nulls_are_skipped() {
        let value = serde_json::json!({
            "key": "PROJ-1",
            "summary": "s",
            "storyPoints": 3,
            "sprint": {"display": "S-12", "id": "9"},
            "emptyField": null,
        });
        let parsed = issue(&value).expect("parsed");

        assert_eq!(parsed.extra.len(), 2);
        assert_eq!(parsed.extra.get("sprint"), Some(&serde_json::json!("S-12")));
        assert!(!parsed.extra.contains_key("emptyField"));
    }

    #[test]
    fn a_payload_without_a_key_is_not_an_issue() {
        assert!(issue(&serde_json::json!({"summary": "s"})).is_none());
    }

    fn subtask_link(direction: &str, key: &str) -> Value {
        serde_json::json!({
            "type": {"id": "subtask", "inward": "Is subtask for", "outward": "Is parent task for"},
            "direction": direction,
            "object": {"key": key, "display": "some issue"},
        })
    }

    /// Tracker answers in the organisation's language. Reading the relationship
    /// from the localised label turned every link in a Russian organisation into
    /// the fallback, so the type id decides.
    #[test]
    fn a_russian_organisation_still_gets_real_link_types() {
        let value = serde_json::json!({
            "type": {"id": "relates", "inward": "Связана", "outward": "Связана"},
            "direction": "outward",
            "object": {"key": "LMS-1", "display": "какая-то задача"},
        });

        assert_eq!(link(&value).expect("link").kind, LinkKind::Relates);
    }

    /// An unfamiliar link type keeps Tracker's own wording rather than being
    /// rendered as the word "link".
    #[test]
    fn an_unknown_link_type_keeps_what_tracker_called_it() {
        let value = serde_json::json!({
            "type": {"id": "somethingNew", "inward": "Blocks release of", "outward": "x"},
            "direction": "inward",
            "object": {"key": "PROJ-5"},
        });

        let parsed = link(&value).expect("link");
        assert_eq!(parsed.kind, LinkKind::Other);
        assert_eq!(parsed.relation.as_deref(), Some("blocks release of"));
    }

    /// Bookkeeping counters are not custom fields; counting them made every
    /// issue look like it had several.
    #[test]
    fn tracker_bookkeeping_is_not_mistaken_for_custom_fields() {
        let value = serde_json::json!({
            "key": "PROJ-1",
            "summary": "s",
            "commentWithExternalMessageCount": 0,
            "votes": 3,
            "followers": [],
            "storyPoints": 5,
        });

        let parsed = issue(&value).expect("parsed");
        assert_eq!(parsed.extra.keys().collect::<Vec<_>>(), ["storyPoints"]);
    }

    #[test]
    fn link_direction_decides_parent_from_subtask() {
        assert_eq!(
            link(&subtask_link("inward", "PROJ-9")).expect("link").kind,
            LinkKind::Parent
        );
        assert_eq!(
            link(&subtask_link("outward", "PROJ-12"))
                .expect("link")
                .kind,
            LinkKind::Subtask
        );
    }

    /// The labels here are Tracker's own, and they are the way round a real
    /// organisation sends them: `depends` **inward** is "блокирующая задача",
    /// the blocking task, so the issue on that end is the one being depended
    /// on. This was asserted backwards for months, by a test written from the
    /// same guess as the code, with a fixture that invented the labels the
    /// other way round.
    ///
    /// A live round trip is what settles it, and there is one in the live
    /// suite: write the link, read it from both ends.
    #[test]
    fn the_end_that_depends_is_the_outward_one() {
        let kind = |direction: &str| {
            let value = serde_json::json!({
                "id": 10,
                "type": {
                    "id": "depends",
                    "inward": "блокирующая задача",
                    "outward": "зависит от",
                },
                "direction": direction,
                "object": {"key": "PROJ-3", "display": "blocker"},
            });
            link(&value).expect("link").kind
        };

        assert_eq!(kind("outward"), LinkKind::Depends);
        assert_eq!(kind("inward"), LinkKind::IsDependentBy);
    }

    /// A payload with no id is still a link. Dropping it would hide it, and a
    /// hidden link is indistinguishable from one that is not there.
    #[test]
    fn a_link_without_an_id_is_still_shown() {
        let value = serde_json::json!({
            "type": {"id": "relates", "inward": "Связана", "outward": "Связана"},
            "direction": "outward",
            "object": {"key": "PROJ-2"},
        });

        let parsed = link(&value).expect("link");
        assert!(parsed.id.is_empty());
        assert_eq!(parsed.key, "PROJ-2");
    }

    #[test]
    fn a_queue_renders_as_its_key_not_its_display_name() {
        let value = serde_json::json!({
            "key": "PROJ-1",
            "summary": "s",
            "queue": {"key": "PROJ", "display": "Product"},
        });
        assert_eq!(
            issue(&value).expect("parsed").queue.as_deref(),
            Some("PROJ")
        );
    }

    /// The line whose whole purpose is to say what to ask for next has to name
    /// a key `--fields` accepts. Tracker prefixes custom fields with the
    /// queue's opaque id and takes the trailing segment back.
    #[test]
    fn a_custom_field_is_keyed_by_the_name_a_caller_can_type() {
        let value = serde_json::json!({
            "key": "PROJ-1",
            "summary": "x",
            "603bd9b6cdc7ba0d2f4b1a55--component": "backend",
            "sprint": "S-12",
        });

        let parsed = issue(&value).expect("parses");

        assert_eq!(
            parsed.extra.get("component"),
            Some(&serde_json::json!("backend"))
        );
        assert!(!parsed.extra.keys().any(|key| key.contains("--")));
        // A field with no prefix is left exactly as it came.
        assert_eq!(parsed.extra.get("sprint"), Some(&serde_json::json!("S-12")));
    }
}