package inventory

import (
	"context"
	"errors"
	"testing"
	"time"

	"github.com/novox/mesh-controller/internal/catalogue"
)

// novox/hq 04-ISSUES/219: two builds of one module in flight together, the one asked first heard
// last. The newer request stood on the newer base; the older one's late outcome is recorded and is
// not what the module is.

func postgresBuild(id string, asked time.Time, image string) Build {
	b := aBuild(id, "postgres", "")
	b.Asked = asked
	b.Against = []string{"mesh-tools/runtime@sha256:" + id}
	b.Made = []Artifact{{Name: "server", Kind: "image", Reference: "postgres@sha256:" + image}}
	return b
}

func TestAnOlderRequestFinishingLaterIsNotWhatTheModuleHolds(t *testing.T) {
	inv := fresh(t)
	ctx := context.Background()
	older := time.Date(2026, 10, 3, 21, 33, 45, 0, time.UTC)
	newer := time.Date(2026, 10, 3, 21, 51, 57, 0, time.UTC)

	// The newer request finishes first, the older one last — recorded in that order.
	if err := inv.RecordBuild(ctx, postgresBuild("newer", newer, "4bcd5f73")); err != nil {
		t.Fatal(err)
	}
	if err := inv.RecordBuild(ctx, postgresBuild("older", older, "0ab07fa9")); err != nil {
		t.Fatal(err)
	}

	held, err := inv.Held(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if got := held["postgres/server"]; got != "postgres@sha256:4bcd5f73" {
		t.Errorf("postgres holds %q; want the newer request's image 4bcd5f73", got)
	}
	against, err := inv.BuiltAgainst(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if got := against["postgres"]; len(got) != 1 || got[0] != "mesh-tools/runtime@sha256:newer" {
		t.Errorf("postgres stands on %v; want what the newer request stood on", got)
	}

	// Both are still recorded, the late one first as what happened lately.
	builds, err := inv.Builds(ctx, "postgres", 5)
	if err != nil {
		t.Fatal(err)
	}
	if len(builds) != 2 || builds[0].ID != "older" || !builds[0].Asked.Equal(older) {
		t.Fatalf("both builds, newest heard first, with when they were asked: %+v", builds)
	}
}

func TestABuildWithNoKnownRequestTimeIsOrderedByWhenItWasRecorded(t *testing.T) {
	// What the mesh did before it kept the request time, so a row from before still answers.
	inv := fresh(t)
	ctx := context.Background()
	for _, id := range []string{"first", "second"} {
		b := aBuild(id, "shell", "")
		b.Made = []Artifact{{Name: "config", Kind: "archive", Reference: "…/" + id}}
		if err := inv.RecordBuild(ctx, b); err != nil {
			t.Fatal(err)
		}
	}
	held, err := inv.Held(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if got := held["shell/config"]; got != "…/second" {
		t.Errorf("shell holds %q; want the one recorded last", got)
	}
}

func TestARegistrationFromAnOlderRequestDoesNotReplaceANewerOne(t *testing.T) {
	inv := fresh(t)
	ctx := context.Background()
	older := time.Date(2026, 10, 3, 21, 33, 45, 0, time.UTC)
	newer := time.Date(2026, 10, 3, 21, 51, 57, 0, time.UTC)
	from := func(asked time.Time) Source {
		return Source{Repository: "novox/mesh-catalog", Seat: "git", Path: "modules/postgres",
			BuiltFrom: "efff5415", Asked: asked}
	}

	if err := inv.RegisterModule(ctx, catalogue.Manifest{Module: "postgres", Version: "fixed"}, from(newer)); err != nil {
		t.Fatal(err)
	}
	err := inv.RegisterModule(ctx, catalogue.Manifest{Module: "postgres", Version: "stale"}, from(older))
	if !errors.Is(err, ErrSuperseded) {
		t.Fatalf("an older request's registration was not refused as superseded: %v", err)
	}
	shelf, err := inv.Catalogue(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if got := shelf["postgres"].Version; got != "fixed" {
		t.Fatalf("postgres is %q; want the newer request's manifest", got)
	}

	// A later request, and a manifest handed over by hand — asked when it is handed over — both
	// replace it as before.
	if err := inv.RegisterModule(ctx, catalogue.Manifest{Module: "postgres", Version: "later"},
		from(newer.Add(time.Minute))); err != nil {
		t.Fatal(err)
	}
	if err := inv.RegisterModule(ctx, catalogue.Manifest{Module: "postgres", Version: "by-hand"}, Source{}); err != nil {
		t.Fatal(err)
	}
	if shelf, _ := inv.Catalogue(ctx); shelf["postgres"].Version != "by-hand" {
		t.Fatalf("postgres is %q; want the manifest handed over by hand", shelf["postgres"].Version)
	}
	src, err := inv.SourceOf(ctx, "postgres")
	if err != nil || src.Repository != "novox/mesh-catalog" {
		t.Fatalf("a hand registration erased the provenance: %+v %v", src, err)
	}
}