package main

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

	"github.com/DATA-DOG/go-sqlmock"
	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/envelope"
)

func TestCustomerHydrogenJobClaimUsesTransactionAndOwner(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}
	defer db.Close()
	mock.ExpectBegin()
	mock.ExpectQuery("SELECT DATE_FORMAT.*FOR UPDATE").WillReturnRows(sqlmock.NewRows([]string{"date"}).AddRow("2026-09-29"))
	mock.ExpectExec("UPDATE platform_customer_hydrogen_job").WithArgs(sqlmock.AnyArg(), "2026-09-29").WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectCommit()
	date, owner, err := claimCustomerHydrogenDay(context.Background(), db)
	if err != nil || date != "2026-09-29" || len(owner) != 32 {
		t.Fatalf("invalid claim %s %s %v", date, owner, err)
	}
	if err = mock.ExpectationsWereMet(); err != nil {
		t.Fatal(err)
	}
}

func TestCustomerHydrogenBoundedWorkerPublishesOneJobThenExits(t *testing.T) {
	t.Setenv("CUSTOMER_HYDROGEN_MAX_JOBS", "1")
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}
	defer db.Close()
	td, raw, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}
	defer td.Close()
	mock.ExpectBegin()
	mock.ExpectQuery("SELECT DATE_FORMAT.*FOR UPDATE").WillReturnRows(sqlmock.NewRows([]string{"date"}).AddRow("2026-09-29"))
	mock.ExpectExec("UPDATE platform_customer_hydrogen_job").WithArgs(sqlmock.AnyArg(), "2026-09-29").WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectCommit()
	raw.ExpectQuery("SELECT").WillReturnRows(sqlmock.NewRows([]string{"event_id"}))
	mock.ExpectBegin()
	mock.ExpectQuery("SELECT 1.*FOR UPDATE").WithArgs("2026-09-29", sqlmock.AnyArg()).WillReturnRows(sqlmock.NewRows([]string{"valid"}).AddRow(1))
	mock.ExpectCommit()
	mock.ExpectExec("UPDATE platform_customer_hydrogen_job SET status").WithArgs("complete", "", "complete", "2026-09-29", sqlmock.AnyArg()).WillReturnResult(sqlmock.NewResult(0, 1))
	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()
	err = runCustomerHydrogenWorker(ctx, db, td, config{Location: time.UTC, TDengineDatabase: "vehicle_ingest", Protocols: []envelope.Protocol{envelope.ProtocolGB32960}})
	if err != nil || ctx.Err() != nil {
		t.Fatalf("bounded worker did not exit after publication: %v / %v", err, ctx.Err())
	}
	if err = mock.ExpectationsWereMet(); err != nil {
		t.Fatal(err)
	}
	if err = raw.ExpectationsWereMet(); err != nil {
		t.Fatal(err)
	}
}

func TestCustomerHydrogenStaleWorkerCannotPublish(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}
	defer db.Close()
	mock.ExpectBegin()
	mock.ExpectQuery("SELECT 1.*lease_until>NOW.*FOR UPDATE").WithArgs("2026-09-29", "old-owner").WillReturnRows(sqlmock.NewRows([]string{"valid"}))
	mock.ExpectRollback()
	days := map[string]*customerHydrogenDay{"sample": {VIN: "VIN", Date: "2026-09-29", HydrogenKM: 10}}
	if err = publishCustomerHydrogenDays(context.Background(), db, days, "2026-09-29", "old-owner"); !errors.Is(err, sql.ErrNoRows) {
		t.Fatalf("stale worker must fail before writing: %v", err)
	}
	if err = mock.ExpectationsWereMet(); err != nil {
		t.Fatal(err)
	}
}

func TestCustomerHydrogenPublicationLocksCurrentLease(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}
	defer db.Close()
	mock.ExpectBegin()
	mock.ExpectQuery("SELECT 1.*lease_until>NOW.*FOR UPDATE").WithArgs("2026-09-29", "current-owner").WillReturnRows(sqlmock.NewRows([]string{"valid"}).AddRow(1))
	mock.ExpectExec("INSERT INTO platform_customer_hydrogen_daily").WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectCommit()
	days := map[string]*customerHydrogenDay{"sample": {VIN: "VIN", Date: "2026-09-29", HydrogenKM: 10}}
	if err = publishCustomerHydrogenDays(context.Background(), db, days, "2026-09-29", "current-owner"); err != nil {
		t.Fatal(err)
	}
	if err = mock.ExpectationsWereMet(); err != nil {
		t.Fatal(err)
	}
}
func TestCustomerHydrogenIdleWorkerDoesNotCreateJobs(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}
	defer db.Close()
	mock.ExpectBegin()
	mock.ExpectQuery("SELECT DATE_FORMAT.*FOR UPDATE").WillReturnRows(sqlmock.NewRows([]string{"date"}))
	mock.ExpectRollback()
	if _, _, err = claimCustomerHydrogenDay(context.Background(), db); !errors.Is(err, sql.ErrNoRows) {
		t.Fatal(err)
	}
	if err = mock.ExpectationsWereMet(); err != nil {
		t.Fatal(err)
	}
}