package inventory

import (
	"testing"
	"time"
)

// A plan is a record the mesh keeps and resumes (novox/hq ADR 0162): written whole, read back open,
// advanced, and gone from the open ones when done.
func TestAPlanIsKeptAdvancedAndResumedFromTheStore(t *testing.T) {
	inv := ForTest(t)
	ctx := t.Context()
	p := Plan{ID: "plan-1", Repository: "novox/mesh-tools", Commit: "abc", Created: time.Now().UTC(),
		State: PlanBuilding, Tiers: [][]string{{"mesh-tools"}, {"builder"}, {"shop"}},
		Modules: map[string]*PlanModule{"mesh-tools": {}, "builder": {}, "shop": {}}}
	if err := inv.SavePlan(ctx, &p); err != nil {
		t.Fatal(err)
	}
	open, err := inv.OpenPlans(ctx)
	if err != nil || len(open) != 1 || open[0].ID != "plan-1" || len(open[0].Tiers) != 3 {
		t.Fatalf("the plan was not kept whole: %v %+v", err, open)
	}
	// Another controller picks it up where it was left: a tier advanced and a module built.
	now := time.Now().UTC()
	resumed := open[0]
	resumed.Tier = 1
	resumed.Modules["mesh-tools"].State = "built"
	resumed.Modules["mesh-tools"].BuiltAt = &now
	resumed.State = PlanRolling
	resumed.Note = "tier 0 built; waiting for builder on anchor to be applied"
	if err := inv.SavePlan(ctx, &resumed); err != nil {
		t.Fatal(err)
	}
	again, err := inv.PlanByID(ctx, "plan-1")
	if err != nil || again.Tier != 1 || again.Modules["mesh-tools"].State != "built" || again.State != PlanRolling {
		t.Fatalf("the advanced plan did not come back as left: %v %+v", err, again)
	}
	again.State = PlanDone
	if err := inv.SavePlan(ctx, &again); err != nil {
		t.Fatal(err)
	}
	if open, _ = inv.OpenPlans(ctx); len(open) != 0 {
		t.Fatalf("a done plan is not open: %+v", open)
	}
	if recent, _ := inv.RecentPlans(ctx, 5); len(recent) != 1 || recent[0].State != PlanDone {
		t.Fatalf("a done plan is still among the recent ones: %+v", recent)
	}
}

// novox/hq issue 254: a plan keeps the branch its merge went into, and a superseded plan is not open.
func TestASupersededPlanIsNotOpen(t *testing.T) {
	inv := ForTest(t)
	ctx := t.Context()
	p := Plan{ID: "plan-1", Repository: "novox/mesh-catalog", Branch: "main", Commit: "abc",
		Created: time.Now().UTC(), State: PlanBuilding, Tiers: [][]string{{"gitea"}},
		Modules: map[string]*PlanModule{"gitea": {}}}
	if err := inv.SavePlan(ctx, &p); err != nil {
		t.Fatal(err)
	}
	kept, err := inv.PlanByID(ctx, "plan-1")
	if err != nil || kept.Branch != "main" {
		t.Fatalf("the branch was not kept: %v %+v", err, kept)
	}
	kept.State = PlanSuperseded
	kept.Note = "superseded at tier 0 by plan-2"
	if err := inv.SavePlan(ctx, &kept); err != nil {
		t.Fatal(err)
	}
	if open, err := inv.OpenPlans(ctx); err != nil || len(open) != 0 {
		t.Fatalf("a superseded plan is still open: %v %+v", err, open)
	}
	if recent, _ := inv.RecentPlans(ctx, 5); len(recent) != 1 || recent[0].State != PlanSuperseded {
		t.Fatalf("a superseded plan is not among the recent ones as superseded: %+v", recent)
	}
}

// novox/hq issue 349 (review of the follow-up): the newest merge of a branch is the one merged last, whatever
// order the plans were made in, in any state; a tie is broken by the plan made last; a release, another
// branch and another repository are never it; and its time is kept to the nanosecond.
func TestTheNewestMergeOfABranchIsTheOneMergedLast(t *testing.T) {
	inv := ForTest(t)
	ctx := t.Context()
	t0 := time.Date(2026, 10, 9, 10, 0, 0, 0, time.UTC)
	save := func(id, repo, branch string, merged, created time.Time, state string, release bool) {
		t.Helper()
		p := Plan{ID: id, Repository: repo, Branch: branch, Commit: id + "-commit", Merged: merged, Created: created,
			State: state, Tiers: [][]string{}, Modules: map[string]*PlanModule{}}
		if release {
			p.Release = &PlanRelease{}
		}
		if err := inv.SavePlan(ctx, &p); err != nil {
			t.Fatal(err)
		}
	}
	if _, found, err := inv.NewestMergeOf(ctx, "novox/mesh-catalog", "main"); err != nil || found {
		t.Fatalf("a branch with no plan: %v %v", found, err)
	}
	// Made in the other order than merged: the later merge's plan made first, and done.
	save("plan-later", "novox/mesh-catalog", "main", t0.Add(2*time.Minute+250*time.Millisecond), t0, PlanDone, false)
	save("plan-earlier", "novox/mesh-catalog", "main", t0.Add(time.Minute), t0.Add(5*time.Minute), PlanRolling, false)
	save("plan-other-branch", "novox/mesh-catalog", "release", t0.Add(time.Hour), t0, PlanRolling, false)
	save("plan-other-repo", "novox/mesh-controller", "main", t0.Add(time.Hour), t0, PlanRolling, false)
	save("release-1", "novox/mesh-catalog", "main", t0.Add(time.Hour), t0, PlanRolling, true)
	save("plan-unknown", "novox/mesh-catalog", "main", time.Time{}, t0.Add(time.Hour), PlanRolling, false)
	p, found, err := inv.NewestMergeOf(ctx, "Novox/Mesh-Catalog", "main")
	if err != nil || !found || p.ID != "plan-later" {
		t.Fatalf("the newest merge: %s %v %v", p.ID, found, err)
	}
	if !p.Merged.Equal(t0.Add(2*time.Minute + 250*time.Millisecond)) {
		t.Fatalf("its merge time was not kept to the nanosecond: %s", p.Merged)
	}
	// The same merge time: the plan made last.
	save("plan-again", "novox/mesh-catalog", "main", t0.Add(2*time.Minute+250*time.Millisecond), t0.Add(time.Minute), PlanBuilding, false)
	if p, _, _ := inv.NewestMergeOf(ctx, "novox/mesh-catalog", "main"); p.ID != "plan-again" {
		t.Fatalf("one merge time, two plans: %s", p.ID)
	}
}