package main

import (
	"context"
	"testing"
	"time"

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

func TestChooseTrustedSourceKeepsContinuingSourceAndRejectsNewJump(t *testing.T) {
	previous := []dailySourceLast{{
		VIN:            "LA9GG64L7PBAF4001",
		SourceKey:      normalizedSourceKey("JT808", "13307765812", "", "115.231.168.135:42630"),
		Phone:          "13307765812",
		SourceEndpoint: "115.231.168.135:42630",
		TotalKM:        4100.8,
	}}
	current := []dailySourceLast{
		{
			VIN:            "LA9GG64L7PBAF4001",
			SourceKey:      normalizedSourceKey("JT808", "13307765812", "", "115.159.85.149:28316"),
			Phone:          "13307765812",
			SourceEndpoint: "115.159.85.149:28316",
			TotalKM:        42447.2,
		},
		{
			VIN:            "LA9GG64L7PBAF4001",
			SourceKey:      normalizedSourceKey("JT808", "13307765812", "", "115.231.168.135:20215"),
			Phone:          "13307765812",
			SourceEndpoint: "115.231.168.135:20215",
			TotalKM:        4123.9,
		},
	}

	chosen, ok := chooseTrustedSource(current, previous)
	if !ok {
		t.Fatal("chooseTrustedSource() did not choose a source")
	}
	if chosen.current.SourceKey != normalizedSourceKey("JT808", "13307765812", "", "115.231.168.135:20215") {
		t.Fatalf("chosen source = %q", chosen.current.SourceKey)
	}
	if delta := chosen.current.TotalKM - chosen.previous.TotalKM; delta < 23 || delta > 24 {
		t.Fatalf("delta = %v, want about 23.1", delta)
	}
}

func TestDailySourceLastBuildsCandidateKeysBySourceIP(t *testing.T) {
	sourceA := dailySourceLast{
		VIN:            "LA9GG64L7PBAF4001",
		SourceKey:      normalizedSourceKey("JT808", "13307765812", "", "115.231.168.135:20215"),
		Phone:          "13307765812",
		SourceEndpoint: "115.231.168.135:20215",
		TotalKM:        4123.9,
	}
	sourceB := dailySourceLast{
		VIN:            "LA9GG64L7PBAF4001",
		SourceKey:      normalizedSourceKey("JT808", "13307765812", "", "115.231.168.135:42630"),
		Phone:          "13307765812",
		SourceEndpoint: "115.231.168.135:42630",
		TotalKM:        4100.8,
	}
	if sourceA.SourceKey != sourceB.SourceKey {
		t.Fatalf("same source IP should produce same source key: %q vs %q", sourceA.SourceKey, sourceB.SourceKey)
	}
}

func TestClearBackfillFinalMileageClearsExactKey(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("sqlmock.New() error = %v", err)
	}
	defer db.Close()
	mock.ExpectExec(`DELETE FROM vehicle_daily_mileage WHERE vin = \? AND stat_date = \? AND protocol = \?`).
		WithArgs("LA9GG64L7PBAF4001", "2026-07-08", "JT808").
		WillReturnResult(sqlmock.NewResult(0, 1))
	if err := clearBackfillFinalMileage(context.Background(), db, "LA9GG64L7PBAF4001", "2026-07-08", envelope.ProtocolJT808); err != nil {
		t.Fatalf("clearBackfillFinalMileage() error = %v", err)
	}
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatalf("sql expectations: %v", err)
	}
}

func TestWriteAggregatesClearsFinalBeforeProjection(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("sqlmock.New() error = %v", err)
	}
	defer db.Close()
	mock.MatchExpectationsInOrder(true)

	projNow := time.Date(2026, 7, 8, 12, 0, 0, 0, time.FixedZone("Asia/Shanghai", 8*3600))
	aggregates := map[string]*metricAgg{
		"LA9GG64L7PBAF4001|2026-07-08|JT808|JT808:13307765812@115.231.168.135": {
			VIN:             "LA9GG64L7PBAF4001",
			Date:            "2026-07-08",
			Protocol:        envelope.ProtocolJT808,
			FirstKM:         4100,
			LatestKM:        4101,
			Count:           1,
			SourceKey:       "JT808:13307765812@115.231.168.135",
			Phone:           "13307765812",
			SourceEndpoint:  "115.231.168.135:20215",
			FirstEventTime:  projNow,
			LatestEventTime: projNow,
			QualityStatus:   stats.QualityInvalidDelta,
			QualityReason:   "outside_daily_range",
		},
	}

	mock.ExpectExec(`INSERT INTO vehicle_data_source`).
		WithArgs("JT808", "115.231.168.135", "115.231.168.135:20215", sqlmock.AnyArg(), sqlmock.AnyArg()).
		WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectExec(`INSERT INTO vehicle_daily_mileage_source`).
		WithArgs(
			"LA9GG64L7PBAF4001",
			"2026-07-08",
			"JT808",
			"JT808:13307765812@115.231.168.135",
			"115.231.168.135",
			"115.231.168.135:20215",
			"13307765812",
			"",
			"",
			float64(4100),
			float64(4101),
			float64(1),
			int64(1),
			projNow,
			projNow,
			stats.QualityInvalidDelta,
			"outside_daily_range",
		).
		WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectExec(`DELETE FROM vehicle_daily_mileage WHERE vin = \? AND stat_date = \? AND protocol = \?`).
		WithArgs("LA9GG64L7PBAF4001", "2026-07-08", "JT808").
		WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectExec(`UPDATE vehicle_daily_mileage_source`).
		WithArgs("LA9GG64L7PBAF4001", "2026-07-08", "JT808").
		WillReturnResult(sqlmock.NewResult(0, 0))
	mock.ExpectExec(`INSERT INTO vehicle_daily_mileage`).
		WithArgs("LA9GG64L7PBAF4001", "2026-07-08", "JT808", int64(1000)).
		WillReturnResult(sqlmock.NewResult(1, 0))
	mock.ExpectExec(`UPDATE vehicle_daily_mileage_source s`).
		WithArgs(
			"LA9GG64L7PBAF4001",
			"2026-07-08",
			"JT808",
			int64(1000),
			"LA9GG64L7PBAF4001",
			"2026-07-08",
			"JT808",
		).
		WillReturnResult(sqlmock.NewResult(0, 1))

	written, err := writeAggregates(context.Background(), db, aggregates, 500)
	if err != nil {
		t.Fatalf("writeAggregates() error = %v", err)
	}
	if written != 1 {
		t.Fatalf("written = %d, want 1", written)
	}
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatalf("sql expectations: %v", err)
	}
}