package frombustest

import (
	"context"
	"strings"
	"testing"

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

// ADR 0570 clause 2 (issue 1954; a3's H5): the in-memory mesh composes a plan from the bus that hands restic to the
// provisioner and names its postgres-database, provided by postgres on n1. And one bad module must not drop its node
// (issue 774): with a module placed beside it whose built manifest cannot be used, or whose plan refuses, PlansHeld
// still hands restic's plan and names the bad one with why, where Plans refuses the whole node. A manifest the indexer
// holds that the mesh refuses (power's bar item with attributes its bar places by none of, mesh-catalog ca8d6f33,
// 2026-10-30) holds that module alone on its node, in the plans and in the node's composition (Compose), and on a node
// it is not placed on holds nothing.
func TestTheProvisionedMeshHandsAPlanWithItsProvision(t *testing.T) {
	fp := "src2:" + strings.Repeat("9", 64)
	for _, row := range []struct {
		name string
		bad  string // the indexer's manifest of a module "backup" placed on n1; empty places none
		// built is the manifest backup's done build names; empty gives it no build
		built string
		why   string // words backup's hold says
		// elsewhere leaves backup in the indexer's modules and places it on no node: nothing is held.
		elsewhere bool
	}{
		{name: "every module composes"},
		{name: "a built manifest that cannot be used",
			bad:   `{"module":"backup","version":"1","build":{"artifacts":[{"name":"files","kind":"archive","from":"files"}]}}`,
			built: `{"module":"backup","version":"1","requires":["amqp"]}`, why: "backup"},
		{name: "a plan that refuses",
			bad: `{"module":"backup","version":"1","resources":[{"id":"conf","type":"file","path":"/etc/backup.conf",` +
				`"mode":"0600","content":"key=${secret:nope}"}]}`, why: "${secret:nope}"},
		{name: "an indexer's manifest the mesh refuses", bad: unusableItem, why: `"shows" is none of them`},
		{name: "an indexer's manifest the mesh refuses, placed elsewhere", bad: unusableItem, elsewhere: true},
	} {
		b, err := Provisioned()
		if err != nil {
			t.Fatal(err)
		}
		if row.bad != "" {
			if !row.elsewhere {
				p := b.Placement[Node]
				p.Modules = append(p.Modules, delivery.PlacedModule{Module: "backup"})
				b.Placement[Node] = p
			}
			digest := delivery.ManifestDigest([]byte(row.bad))
			b.Manifests[digest] = []byte(row.bad)
			b.Module["backup"] = delivery.Module{FP2: fp, Manifest: digest}
			if row.built != "" {
				builtDigest := delivery.ManifestDigest([]byte(row.built))
				b.Manifests[builtDigest] = []byte(row.built)
				b.Builds["backup "+fp] = &delivery.BuilderBuild{State: delivery.BuildDone, Manifest: builtDigest,
					Artifacts: []delivery.BuiltArtifact{{Name: "files", Kind: "archive", Reference: "artifact-store://backup/files/blobs/x", Digest: "sha256:x"}}}
			}
			if _, err := frombus.Plans(context.Background(), b, frombus.Mesh{}, frombus.Scope{Node: Node}); err == nil && !row.elsewhere {
				t.Errorf("%s: Plans composed the node; the row does not refuse it", row.name)
			}
		}
		if row.why != "" || row.bad == "" {
			// The node's own composition holds by the same rule: every other module composed, the bad one named.
			fps := FPs()
			if row.bad != "" {
				fps["backup"] = fp
			}
			out, _, held, err := frombus.Compose(context.Background(), b, frombus.Mesh{}, frombus.Scope{Node: Node}, fps)
			if err != nil {
				t.Fatalf("%s: the node's composition: %v", row.name, err)
			}
			if key, _ := delivery.ComposedKey(Node, "restic", fps["restic"]); out[key].Module != "restic" {
				t.Errorf("%s: restic is not composed (held %v)", row.name, held)
			}
			if why, ok := held["backup"]; (row.bad == "" && len(held) > 0) || (row.bad != "" && (!ok || !strings.Contains(why, row.why) || len(held) != 1)) {
				t.Errorf("%s: the node's composition held %v, want backup alone, saying %q", row.name, held, row.why)
			}
		}
		plans, held, err := frombus.PlansHeld(context.Background(), b, frombus.Mesh{}, frombus.Scope{Node: Node})
		if err != nil {
			t.Fatalf("%s: %v", row.name, err)
		}
		restic, handed := plans["restic"]
		if !handed || len(restic.Provisions) != 1 || restic.Provisions[0].Provision != "postgres-database" ||
			restic.Provisions[0].Provider != Node || restic.Provisions[0].ProviderModule != "postgres" {
			t.Fatalf("%s: the plans are %+v (held %v)", row.name, plans, held)
		}
		if row.bad == "" || row.elsewhere {
			if len(held) > 0 {
				t.Errorf("%s: held %v", row.name, held)
			}
			continue
		}
		if why, ok := held["backup"]; !ok || !strings.Contains(why, row.why) || len(held) != 1 {
			t.Errorf("%s: held %v, want backup alone, saying %q", row.name, held, row.why)
		}
		if _, planned := plans["backup"]; planned {
			t.Errorf("%s: the held module has a plan", row.name)
		}
	}
}

// unusableItem is a manifest the mesh refuses as the node-engine did power's at mesh-catalog ca8d6f33: a bar block item
// with attributes its bar places by none of.
const unusableItem = `{"module":"backup","version":"1","moved":true,` +
	`"build":{"artifacts":[{"name":"files","kind":"archive","from":"files"}]},` +
	`"items":[{"collection":"contribution:node-bar:block",` +
	`"attributes":{"bar":"bottom","place":"status","shows":"state","state":"power.draw"},"template":"files/bar"}]}`