package tasks

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

	"vctp/db"

	"github.com/jmoiron/sqlx"
	_ "modernc.org/sqlite"
)

func newTasksTestDB(t *testing.T) *sqlx.DB {
	t.Helper()
	dbConn, err := sqlx.Open("sqlite", ":memory:")
	if err != nil {
		t.Fatalf("failed to open sqlite test db: %v", err)
	}
	t.Cleanup(func() {
		_ = dbConn.Close()
	})
	return dbConn
}

func TestBackfillSnapshotRowFromHourlyCache(t *testing.T) {
	ctx := context.Background()
	dbConn := newTasksTestDB(t)

	if err := db.EnsureVmHourlyStats(ctx, dbConn); err != nil {
		t.Fatalf("failed to ensure vm_hourly_stats: %v", err)
	}

	insertSQL := `
INSERT INTO vm_hourly_stats (
  "SnapshotTime","Vcenter","VmId","VmUuid","Name","CreationTime","DeletionTime","ResourcePool",
  "Datacenter","Cluster","Folder","ProvisionedDisk","VcpuCount","RamGB","IsTemplate","PoweredOn","SrmPlaceholder"
) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)
`
	if _, err := dbConn.ExecContext(ctx, insertSQL,
		int64(1000), "vc-a", "vm-1", "uuid-1", "demo-vm", int64(900), int64(0), "Tin",
		"dc-1", "cluster-1", "/Prod", 123.4, int64(4), int64(16), "FALSE", "TRUE", "FALSE",
	); err != nil {
		t.Fatalf("failed to insert cache row: %v", err)
	}

	row := InventorySnapshotRow{
		Vcenter:        "vc-a",
		VmId:           sql.NullString{String: "vm-1", Valid: true},
		Name:           "demo-vm",
		SnapshotTime:   2000,
		ResourcePool:   sql.NullString{String: "Tin", Valid: true},
		SrmPlaceholder: "",
	}
	if !needsSnapshotBackfill(row) {
		t.Fatal("expected sparse row to require backfill")
	}

	changed := backfillSnapshotRowFromHourlyCache(ctx, dbConn, &row)
	if !changed {
		t.Fatal("expected cache backfill to update the row")
	}

	if !row.CreationTime.Valid || row.CreationTime.Int64 != 900 {
		t.Fatalf("unexpected CreationTime after backfill: %#v", row.CreationTime)
	}
	if !row.Cluster.Valid || row.Cluster.String != "cluster-1" {
		t.Fatalf("unexpected Cluster after backfill: %#v", row.Cluster)
	}
	if !row.Datacenter.Valid || row.Datacenter.String != "dc-1" {
		t.Fatalf("unexpected Datacenter after backfill: %#v", row.Datacenter)
	}
	if !row.ProvisionedDisk.Valid || row.ProvisionedDisk.Float64 != 123.4 {
		t.Fatalf("unexpected ProvisionedDisk after backfill: %#v", row.ProvisionedDisk)
	}
	if !row.VcpuCount.Valid || row.VcpuCount.Int64 != 4 {
		t.Fatalf("unexpected VcpuCount after backfill: %#v", row.VcpuCount)
	}
	if !row.RamGB.Valid || row.RamGB.Int64 != 16 {
		t.Fatalf("unexpected RamGB after backfill: %#v", row.RamGB)
	}
	if row.SrmPlaceholder != "FALSE" {
		t.Fatalf("unexpected SrmPlaceholder after backfill: %q", row.SrmPlaceholder)
	}
	if !row.VmUuid.Valid || row.VmUuid.String != "uuid-1" {
		t.Fatalf("unexpected VmUuid after backfill: %#v", row.VmUuid)
	}
}

func TestBackfillSnapshotRowFromHourlyCacheNoMatch(t *testing.T) {
	ctx := context.Background()
	dbConn := newTasksTestDB(t)

	if err := db.EnsureVmHourlyStats(ctx, dbConn); err != nil {
		t.Fatalf("failed to ensure vm_hourly_stats: %v", err)
	}

	row := InventorySnapshotRow{
		Vcenter: "vc-a",
		VmId:    sql.NullString{String: "vm-missing", Valid: true},
	}
	changed := backfillSnapshotRowFromHourlyCache(ctx, dbConn, &row)
	if changed {
		t.Fatal("expected no backfill change for missing VM")
	}
}