kimun-notes 0.20.1

//! Query variables: `{name}` placeholders the TUI resolves to runtime
//! values before a query reaches core (see `CONTEXT.md` "Query variable"
//!). Core's query language never sees these.

use kimun_core::nfs::VaultPath;
use kimun_core::{expand_bare_note_prefixes, quote_query_term, strip_order_directive};

/// The current-note variable. A bare note operator (`<`, `>`, `=`, their long
/// forms and `-` exclusion variants) typed in the query panel is sugar for
/// `<op>{note}`, expanded by core's [`expand_bare_note_prefixes`] before
/// resolution so the DSL's tokenization is never re-implemented here.
pub const VAR_NOTE: &str = "{note}";

/// The runtime context a query template resolves against. Today it carries
/// only the open note, but it is the single place future query variables
/// (`{date}`, `{selection}`, …) extend: row sources and call sites resolve
/// through a `QueryContext`, so adding a variable touches this struct and the
/// resolver below — never the sources. See CONTEXT.md "Query context".
#[derive(Clone, Default)]
pub struct QueryContext {
    /// The note open when the query runs. `{note}` and the bare-operator sugar
    /// resolve against its clean name. `None`, or a root/empty path, means no
    /// note is available to resolve against.
    pub current_note: Option<VaultPath>,
}

impl QueryContext {
    /// Context with just the open note — the only field today.
    pub fn with_note(current_note: Option<VaultPath>) -> Self {
        Self { current_note }
    }

    /// True when a note is available to resolve `{note}` against (present and
    /// not the root/empty path).
    fn has_note(&self) -> bool {
        self.current_note
            .as_ref()
            .is_some_and(|p| !p.is_root_or_empty())
    }

    fn note_term(&self) -> String {
        self.current_note
            .as_ref()
            .map(|p| quote_query_term(&p.get_clean_name()))
            .unwrap_or_default()
    }
}

/// True if `template` contains any query variable (including the bare-operator
/// sugar forms). The query panel uses this to decide whether to re-run on note
/// navigation.
pub fn query_has_variables(template: &str) -> bool {
    expand_bare_note_prefixes(template, VAR_NOTE).contains(VAR_NOTE)
}

/// True when `template` needs the current note but none is available: it
/// contains note variables (literal `{note}` or bare-operator sugar) and,
/// after dropping every variable-bearing token and the order directive,
/// nothing searchable remains. Mixed queries (`widget <`) keep their concrete
/// terms and must still run — core simply drops the unresolved bare prefix.
/// Purely note-dependent queries (`<`, `<{note} or:title`) would reach core
/// as dropped bare prefixes: a wasted round-trip that returns nothing, so
/// callers should skip the search (and pick their own fallback).
pub fn query_is_unresolvable(template: &str, ctx: &QueryContext) -> bool {
    if ctx.has_note() {
        return false;
    }
    let expanded = expand_bare_note_prefixes(template, VAR_NOTE);
    expanded.contains(VAR_NOTE)
        && strip_order_directive(&expanded)
            .split_whitespace()
            .all(|token| token.contains(VAR_NOTE))
}

/// Resolve all query variables in `template` against the open note,
/// producing a plain query string for `vault.search_notes`. Bare note
/// operators are first expanded to their `{note}` form, then `{note}`
/// becomes the note's clean name (matching how `<` targets are
/// matched), quoted when it contains whitespace so a multi-word name
/// stays a single query token. When no note is open, `{note}` resolves
/// to the empty string.
pub fn resolve_query(template: &str, ctx: &QueryContext) -> String {
    expand_bare_note_prefixes(template, VAR_NOTE).replace(VAR_NOTE, &ctx.note_term())
}

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

    /// Context with the given note open.
    fn with(p: &VaultPath) -> QueryContext {
        QueryContext::with_note(Some(p.clone()))
    }

    /// Context with no note open.
    fn none() -> QueryContext {
        QueryContext::default()
    }

    #[test]
    fn detects_variables() {
        assert!(query_has_variables("<{note}"));
        assert!(query_has_variables("#todo <{note}"));
        assert!(!query_has_variables("#todo"));
    }

    #[test]
    fn resolves_note_variable() {
        let p = VaultPath::note_path_from("work/spec.md");
        assert_eq!(resolve_query("<{note}", &with(&p)), "<spec");
        assert_eq!(resolve_query("#todo <{note}", &with(&p)), "#todo <spec");
    }

    #[test]
    fn resolves_note_with_spaces_quoted() {
        let p = VaultPath::note_path_from("work/my note.md");
        // Multi-word name must be quoted so the parser sees one link target,
        // not `<my` plus a stray `note` term.
        assert_eq!(resolve_query("<{note}", &with(&p)), "<\"my note\"");
    }

    #[test]
    fn resolves_to_empty_without_note() {
        assert_eq!(resolve_query("<{note}", &none()), "<");
        assert_eq!(resolve_query("#todo", &none()), "#todo");
    }

    #[test]
    fn bare_operators_expand_to_note_variable() {
        let p = VaultPath::note_path_from("work/spec.md");
        assert_eq!(resolve_query("<", &with(&p)), "<spec");
        assert_eq!(resolve_query(">", &with(&p)), ">spec");
        assert_eq!(resolve_query("=", &with(&p)), "=spec");
        assert_eq!(resolve_query("#todo <", &with(&p)), "#todo <spec");
        assert_eq!(resolve_query("< #todo", &with(&p)), "<spec #todo");
    }

    #[test]
    fn bare_long_forms_and_exclusions_expand_too() {
        let p = VaultPath::note_path_from("work/spec.md");
        assert_eq!(resolve_query("lk:", &with(&p)), "lk:spec");
        assert_eq!(resolve_query("fwd:", &with(&p)), "fwd:spec");
        assert_eq!(resolve_query("name:", &with(&p)), "name:spec");
        assert_eq!(resolve_query("-<", &with(&p)), "-<spec");
    }

    #[test]
    fn apostrophe_in_term_does_not_suppress_expansion() {
        // A mid-token apostrophe is a literal character (matching core's
        // parser), not a quote opener, so sugar after a contraction still
        // expands.
        let p = VaultPath::note_path_from("work/spec.md");
        assert_eq!(resolve_query("don't <", &with(&p)), "don't <spec");
        assert_eq!(resolve_query("= don't <", &with(&p)), "=spec don't <spec");
    }

    #[test]
    fn operators_with_targets_stay_untouched() {
        let p = VaultPath::note_path_from("work/spec.md");
        assert_eq!(resolve_query("<projects", &with(&p)), "<projects");
        assert_eq!(resolve_query(">projects", &with(&p)), ">projects");
        assert_eq!(resolve_query("=projects", &with(&p)), "=projects");
    }

    #[test]
    fn bare_operator_inside_quotes_stays_untouched() {
        let p = VaultPath::note_path_from("work/spec.md");
        assert_eq!(resolve_query("\"a < b\"", &with(&p)), "\"a < b\"");
        assert_eq!(resolve_query("'a = b'", &with(&p)), "'a = b'");
    }

    #[test]
    fn unresolvable_only_when_purely_note_dependent() {
        let p = VaultPath::note_path_from("work/spec.md");
        // A real note resolves everything.
        assert!(!query_is_unresolvable("<", &with(&p)));
        assert!(!query_is_unresolvable("<{note}", &with(&p)));
        // No note (or the empty root path): purely note-dependent queries
        // cannot produce results.
        assert!(query_is_unresolvable("<", &none()));
        assert!(query_is_unresolvable("<{note}", &none()));
        assert!(query_is_unresolvable("< or:title", &none()));
        assert!(query_is_unresolvable("<", &with(&VaultPath::empty())));
        // Mixed queries keep concrete terms and must still run.
        assert!(!query_is_unresolvable("widget <", &none()));
        assert!(!query_is_unresolvable("#todo <{note}", &none()));
        // No variables at all: always resolvable.
        assert!(!query_is_unresolvable("widget", &none()));
        assert!(!query_is_unresolvable("", &none()));
    }

    #[test]
    fn bare_operators_count_as_variables() {
        assert!(query_has_variables("<"));
        assert!(query_has_variables(">"));
        assert!(query_has_variables("="));
        assert!(query_has_variables("#todo <"));
        assert!(!query_has_variables("<projects"));
        assert!(!query_has_variables("\"a < b\""));
    }
}