package frombus

import (
	"context"
	"strings"
	"testing"

	"git.novox.be/novox/mesh-sdk/go/delivery"
)

// aNode is a bus with n1 the hub, each of manifests placed on it and held at the indexer, in the order given.
func aNode(t *testing.T, manifests ...string) (*bus, map[string]string) {
	t.Helper()
	p := delivery.Placement{Node: "n1", Decided: delivery.NodeDecided{Hub: true, Address: "10.77.0.1"}}
	b := &bus{records: map[string]delivery.NodeRecord{"n1": {Node: "n1", TunnelKey: publicKey(t), SealingKey: "sk", Capabilities: []string{"systemd"}}},
		modules: map[string]delivery.Module{}, manifests: map[string][]byte{}, builds: map[string]*delivery.BuilderBuild{}}
	fps := map[string]string{}
	for i, raw := range manifests {
		module := strings.SplitN(strings.TrimPrefix(raw, `{"module":"`), `"`, 2)[0]
		p.Modules = append(p.Modules, delivery.PlacedModule{Module: module})
		b.modules[module] = delivery.Module{Manifest: delivery.ManifestDigest([]byte(raw))}
		b.manifests[delivery.ManifestDigest([]byte(raw))] = []byte(raw)
		fps[module] = "src2:" + strings.Repeat(string(rune('1'+i)), 64)
	}
	b.placements = map[string]delivery.Placement{"n1": p}
	return b, fps
}

// Issue 774, 2026-10-30 19:30: a node refused whole after holding a module says what it held and why, since the last
// refusal can be of the held module's stub (node-tools held, then "its build produced 0 bundle(s)", its own why unsaid).
func aNodeRefusedWholeSaysWhatItHeld(t *testing.T) {
	refused := `{"module":"power","version":"1","items":[{"collection":"contribution:node-bar:block","attributes":{"shows":"state"},"template":"files/a"}]}`
	needs := `{"module":"lamp","version":"1","requires":["nothing-provides-this"]}`
	b, fps := aNode(t, refused, needs)
	_, _, held, err := Compose(context.Background(), b, Mesh{}, Scope{Node: "n1"}, fps)
	if err == nil || !strings.Contains(err.Error(), "nothing provides") || !strings.Contains(err.Error(), `held before: power: `) ||
		!strings.Contains(err.Error(), `"shows" is none of them`) {
		t.Errorf("the node refused whole with %v (held %v), want lamp's refusal and power held before, with its why", err, held)
	}
}