package main

import (
	"database/sql"
	"testing"
)

func TestResolveVINPrefersConsistentCurrentMapping(t *testing.T) {
	current := mappingIndex{Unique: map[string]string{"沪A12345": "LA9GG64L0NBAF4175"}}
	legacy := mappingIndex{Unique: map[string]string{"沪A12345": "LA9GG64L0NBAF4175"}}
	vin, origin, conflict := resolveVIN("沪A12345", current, legacy)
	if conflict || vin != "LA9GG64L0NBAF4175" || origin != "current_vehicle" {
		t.Fatalf("unexpected resolution: vin=%q origin=%q conflict=%v", vin, origin, conflict)
	}
}

func TestResolveVINRejectsCurrentLegacyConflict(t *testing.T) {
	current := mappingIndex{Unique: map[string]string{"沪A12345": "LA9GG64L0NBAF4175"}}
	legacy := mappingIndex{Unique: map[string]string{"沪A12345": "LA9GG64L0NBAF4176"}}
	vin, _, conflict := resolveVIN("沪A12345", current, legacy)
	if !conflict || vin != "" {
		t.Fatalf("expected conflict rejection, got vin=%q conflict=%v", vin, conflict)
	}
}

func TestResolveVINUsesLegacyFallback(t *testing.T) {
	current := mappingIndex{Unique: map[string]string{}}
	legacy := mappingIndex{Unique: map[string]string{"沪A12345": "LA9GG64L0NBAF4175"}}
	vin, origin, conflict := resolveVIN("沪A12345", current, legacy)
	if conflict || vin != "LA9GG64L0NBAF4175" || origin != "legacy_vehicle" {
		t.Fatalf("unexpected resolution: vin=%q origin=%q conflict=%v", vin, origin, conflict)
	}
}

func TestResolveVINAcceptsSourceVIN(t *testing.T) {
	vin, origin, conflict := resolveVIN("LA9GG64L0NBAF4175", mappingIndex{}, mappingIndex{})
	if conflict || vin != "LA9GG64L0NBAF4175" || origin != "source_vin" {
		t.Fatalf("unexpected resolution: vin=%q origin=%q conflict=%v", vin, origin, conflict)
	}
}

func TestNormalizeIdentifierRemovesWhitespace(t *testing.T) {
	if got := normalizeIdentifier("  沪 a 12345 \n"); got != "沪A12345" {
		t.Fatalf("normalizeIdentifier() = %q", got)
	}
}

func TestNullableTotalMileageConvertsMetersToKM(t *testing.T) {
	got := nullableTotalMileageKM(sql.NullFloat64{Float64: 59198000, Valid: true})
	if got != 59198.0 {
		t.Fatalf("nullableTotalMileageKM() = %#v", got)
	}
	if got := nullableTotalMileageKM(sql.NullFloat64{}); got != nil {
		t.Fatalf("invalid mileage should remain nil, got %#v", got)
	}
}