alef 0.84.1

//! Regression coverage for the element accessor a wildcard (`container[].field`) fixture path
//! expands to in the Go e2e generator.
//!
//! Split into its own file rather than added to `go/assertions.rs`: that file sits at its recorded
//! ceiling in `tests/file_size_baseline.txt`, so new coverage goes into a fresh module instead of
//! growing it (see `file-modularization` in CLAUDE.md). ~keep
//!
//! The defect: `render_wildcard_assertion` splits `records[].kind` into the container `records`
//! and the element half `kind`, then built the loop body with `FieldResolver::accessor`, which
//! anchors a path against the call's RESULT type. `kind` is not declared on the root, so the
//! envelope rescue prefixed it through the `result_fields` entry that does reach it and handed
//! back `records[0].kind`. Rendered against `e`, which is ALREADY an element, that is
//! `e.Records[0].Kind` — the container path applied a second time, addressing a field the Go
//! element struct does not have. `element_accessor` anchors at the element instead.

use std::collections::{HashMap, HashSet};

use super::assertions::{AssertionRenderContext, render_assertion};
use crate::e2e::codegen::wildcard_element_fixture::{
    WILDCARD_FIELD, assert_container_accessor_appears_once, assert_element_relative, contains_assertion,
    envelope_resolver, report_resolver,
};
use crate::e2e::field_access::FieldResolver;

const CONTAINER_ACCESSOR: &str = ".Records";

fn render(resolver: &FieldResolver) -> String {
    let mut out = String::new();
    let context = AssertionRenderContext {
        effective_result_var: "result",
        import_alias: "sample",
        field_resolver: resolver,
        optional_locals: &HashMap::new(),
        numeric_scalar_fields: &HashSet::new(),
        presence_checked_fields: &HashSet::new(),
        result_is_simple: false,
        result_is_array: false,
        is_streaming: false,
        streaming_item_type: None,
    };
    render_assertion(&mut out, &context, &contains_assertion(WILDCARD_FIELD));
    out
}

#[test]
fn wildcard_loop_body_is_relative_to_the_element_binding() {
    let rendered = render(&report_resolver("go"));

    assert_element_relative(&rendered, "e.Kind", "e.Records[0].Kind");
    assert_container_accessor_appears_once(&rendered, CONTAINER_ACCESSOR);
}

/// The container half must keep resolving against the result variable — the fix must not turn
/// into "never anchor", which would still satisfy the assertion above.
#[test]
fn wildcard_container_stays_anchored_to_the_result_variable() {
    let rendered = render(&report_resolver("go"));

    assert!(
        rendered.contains("for _, e := range result.Records {"),
        "container half must iterate the result variable's own field, got: {rendered}"
    );
}

/// The stronger container control: on an envelope root the container is reachable only THROUGH
/// the `result_fields` projection, so dropping the anchoring from `accessor` — rather than only
/// from the element half — renders `result.Records`, a member the envelope does not declare.
#[test]
fn wildcard_container_keeps_its_envelope_projection() {
    let rendered = render(&envelope_resolver("go"));

    assert!(
        rendered.contains("for _, e := range result.Results[0].Records {"),
        "container half must keep the result-anchored envelope projection, got: {rendered}"
    );
    assert_container_accessor_appears_once(&rendered, CONTAINER_ACCESSOR);
}