package intentflow_test

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

	"chat-agent-system/internal/app/intentflow"
	"chat-agent-system/internal/app/uow"
	"chat-agent-system/internal/db"

	"github.com/jackc/pgx/v5/pgxpool"
)

func init() {
	if _, err := os.Stat("deploy/postgres/goose"); err == nil {
		return
	}
	for _, cand := range []string{"../../..", "../../../.."} {
		if fi, err := os.Stat(cand + "/deploy/postgres/goose"); err == nil && fi.IsDir() {
			_ = os.Chdir(cand)
			return
		}
	}
}

func TestPlansPG_CreateClaimAndFence(t *testing.T) {
	if testing.Short() {
		t.Skip("intentflow PG is not part of -short")
	}
	dsn := db.SkipIfNoTestDatabaseURL(t)
	db.RefuseSharedEnvDSN(t, dsn)
	ctx := context.Background()
	pool, err := pgxpool.New(ctx, dsn)
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(pool.Close)
	if err := db.RunMigrationsOnceForTest(ctx, pool, dsn); err != nil {
		t.Fatalf("migrate: %v", err)
	}

	now := time.Date(2026, 9, 15, 15, 0, 0, 0, time.UTC)
	clock := now
	owner := intentflow.NewFakeActionOwner()
	plans := intentflow.NewPlans(uow.NewPG(pool), intentflow.NewRepository(), intentflow.Options{
		Owner: owner,
		Now:   func() time.Time { return clock },
		Lease: 5 * time.Second,
	})
	prin := intentflow.Principal{UserID: 9, Environment: "ci", ProjectID: 1001, SessionID: "sess-pg-u3"}
	created, err := plans.CreatePlan(ctx, intentflow.CreateCommand{
		Principal: prin, ClientTurnID: "pg-turn-1", RequestDigest: "pg-d1",
		WritePlan: true,
		Steps: []intentflow.StepDraft{
			{ActionKey: "regulation.query", ActionDigest: "q"},
			{ActionKey: "task.run", ActionDigest: "w"},
		},
	})
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() {
		_, _ = pool.Exec(context.Background(), `DELETE FROM intent_plans WHERE plan_id=$1`, created.PlanID)
	})
	again, err := plans.CreatePlan(ctx, intentflow.CreateCommand{
		Principal: prin, ClientTurnID: "pg-turn-1", RequestDigest: "pg-d1",
		WritePlan: true,
		Steps: []intentflow.StepDraft{
			{ActionKey: "regulation.query", ActionDigest: "q"},
			{ActionKey: "task.run", ActionDigest: "w"},
		},
	})
	if err != nil || again.PlanID != created.PlanID {
		t.Fatalf("idempotent create: %v %+v", err, again)
	}
	confirmed, err := plans.DecidePlan(ctx, intentflow.DecisionCommand{
		Principal: prin, PlanID: created.PlanID, ExpectedRevision: created.Revision,
		DecisionNonce: "pg-n", DecisionDigest: "pg-dec", Kind: intentflow.DecisionConfirm,
	})
	if err != nil {
		t.Fatal(err)
	}
	a, err := plans.ClaimStep(ctx, "pg-a", created.PlanID, confirmed.Steps[0].StepID)
	if err != nil || a == nil {
		t.Fatalf("claim a: %v", err)
	}
	b, err := plans.ClaimStep(ctx, "pg-b", created.PlanID, confirmed.Steps[0].StepID)
	if err != nil {
		t.Fatal(err)
	}
	if b != nil {
		t.Fatal("second worker must not own a live lease")
	}
	clock = clock.Add(time.Minute)
	c, err := plans.ClaimStep(ctx, "pg-c", created.PlanID, confirmed.Steps[0].StepID)
	if err != nil || c == nil {
		t.Fatalf("takeover: %v", err)
	}
	if _, err := plans.ExecuteClaimed(ctx, a); !errors.Is(err, intentflow.ErrPlanActionVersionConflict) {
		t.Fatalf("old fence: %v", err)
	}
	if _, err := plans.ExecuteClaimed(ctx, c); err != nil {
		t.Fatal(err)
	}
	other := prin
	other.Environment = "dev"
	if _, err := plans.GetPlan(ctx, other, created.PlanID); !errors.Is(err, intentflow.ErrPlanNotFoundOrHidden) {
		t.Fatalf("env isolation: %v", err)
	}
}