package server_test

import (
	"context"
	"database/sql"
	"os"
	"testing"

	"git.coopcloud.tech/wiki-cafe/member-console/internal/billing"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/db"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/entitlements"
	"git.coopcloud.tech/wiki-cafe/member-console/internal/migrate"
	"github.com/google/uuid"
	_ "github.com/jackc/pgx/v5/stdlib"
)

func testDB(t *testing.T) *sql.DB {
	t.Helper()
	dsn := os.Getenv("TEST_DATABASE_URL")
	if dsn == "" {
		t.Skip("TEST_DATABASE_URL not set, skipping integration test")
	}

	database, err := sql.Open("pgx", dsn)
	if err != nil {
		t.Fatalf("failed to open database: %v", err)
	}

	sources := migrate.Sources()
	if err := db.RunMigrations(database, sources); err != nil {
		t.Fatalf("failed to run migrations: %v", err)
	}

	t.Cleanup(func() { database.Close() })
	return database
}

// TestPlanLadderOperatorWorkflow verifies the full operator ladder CRUD workflow:
// create ladder, add tiers, reorder ranks, and delete ladder.
func TestPlanLadderOperatorWorkflow(t *testing.T) {
	database := testDB(t)
	ctx := context.Background()

	tx, err := database.BeginTx(ctx, nil)
	if err != nil {
		t.Fatal(err)
	}
	defer tx.Rollback()

	bq := billing.New(tx)
	eq := entitlements.New(tx)

	// 1. Create a plan ladder
	ladder, err := bq.CreatePlanLadder(ctx, billing.CreatePlanLadderParams{
		LadderKey:   "test-ladder-" + uuid.New().String()[:8],
		Name:        "Test Ladder",
		Description: sql.NullString{String: "A test ladder", Valid: true},
		IsActive:    true,
	})
	if err != nil {
		t.Fatalf("create plan ladder: %v", err)
	}
	if ladder.PlanLadderID == "" {
		t.Fatal("expected ladder ID to be set")
	}

	// 2. Create a published product — any published product may be a ladder
	// tier since doc 41 (display_category is presentation-only).
	// First we need an entitlement set
	es, err := eq.CreateEntitlementSet(ctx, entitlements.CreateEntitlementSetParams{
		Name:        "test-set-" + uuid.New().String()[:8],
		Description: sql.NullString{String: "Test set", Valid: true},
	})
	if err != nil {
		t.Fatalf("create entitlement set: %v", err)
	}

	product, err := bq.CreateProduct(ctx, billing.CreateProductParams{
		Name:             "Test Plan Product",
		Description:      sql.NullString{String: "A test plan product", Valid: true},
		IsActive:         true,
		IsPublic:         true,
		EntitlementSetID: uuid.NullUUID{UUID: uuid.MustParse(es.SetID), Valid: true},
		LifecycleStatus:  "published",
	})
	if err != nil {
		t.Fatalf("create product: %v", err)
	}

	// 3. Add tier to ladder — rank self-assigns append-at-end, so the first
	// tier of a fresh ladder lands at rank 0.
	tier, err := bq.CreatePlanLadderTier(ctx, billing.CreatePlanLadderTierParams{
		PlanLadderID: ladder.PlanLadderID,
		ProductID:    product.ProductID,
	})
	if err != nil {
		t.Fatalf("create plan ladder tier: %v", err)
	}
	if tier.Rank != 0 {
		t.Fatalf("expected rank 0, got %d", tier.Rank)
	}

	// Verify tier appears in list
	tiers, err := bq.ListTiersByLadder(ctx, ladder.PlanLadderID)
	if err != nil {
		t.Fatalf("list tiers: %v", err)
	}
	if len(tiers) != 1 {
		t.Fatalf("expected 1 tier, got %d", len(tiers))
	}

	// 4. Reorder tier to rank 2
	updatedTier, err := bq.UpdateTierRank(ctx, billing.UpdateTierRankParams{
		PlanLadderID: ladder.PlanLadderID,
		ProductID:    product.ProductID,
		Rank:         2,
	})
	if err != nil {
		t.Fatalf("update tier rank: %v", err)
	}
	if updatedTier.Rank != 2 {
		t.Fatalf("expected rank 2, got %d", updatedTier.Rank)
	}

	// 5. Verify delete is blocked when no active attachments exist
	// (no attachments in this test, so delete should succeed)
	count, err := eq.CountActiveAttachmentsByLadder(ctx, ladder.PlanLadderID)
	if err != nil {
		t.Fatalf("count active attachments: %v", err)
	}
	if count != 0 {
		t.Fatalf("expected 0 active attachments, got %d", count)
	}

	// 6. Delete the tier first (should succeed since no active attachments)
	err = bq.DeleteTier(ctx, billing.DeleteTierParams{
		PlanLadderID: ladder.PlanLadderID,
		ProductID:    product.ProductID,
	})
	if err != nil {
		t.Fatalf("delete tier: %v", err)
	}

	// Verify tier is gone
	tiers, err = bq.ListTiersByLadder(ctx, ladder.PlanLadderID)
	if err != nil {
		t.Fatalf("list tiers after delete: %v", err)
	}
	if len(tiers) != 0 {
		t.Fatalf("expected 0 tiers after delete, got %d", len(tiers))
	}

	// 7. Delete the ladder
	err = bq.DeletePlanLadder(ctx, ladder.PlanLadderID)
	if err != nil {
		t.Fatalf("delete plan ladder: %v", err)
	}

	// Verify ladder is gone
	_, err = bq.GetPlanLadderByID(ctx, ladder.PlanLadderID)
	if err == nil {
		t.Fatal("expected ladder to be deleted")
	}
}