package service_test

import (
	"context"
	"testing"

	"bugulma/backend/internal/domain"
	"bugulma/backend/internal/geospatial"
	"bugulma/backend/internal/repository"
	"bugulma/backend/internal/service"
	"bugulma/backend/internal/testutils"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/suite"
	"gorm.io/datatypes"
	"gorm.io/gorm"
)

type SpatialResourceMatcherTestSuite struct {
	suite.Suite
	db          *gorm.DB
	siteRepo    domain.SiteRepository
	flowRepo    domain.ResourceFlowRepository
	geoSvc      *service.GeospatialService
	transportSvc *service.TransportationService
	geoCalc     geospatial.Calculator
	matcher     *service.SpatialResourceMatcher
}

func (suite *SpatialResourceMatcherTestSuite) SetupTest() {
	suite.db = testutils.SetupTestDB(suite.T())
	suite.siteRepo = repository.NewSiteRepository(suite.db)
	suite.flowRepo = repository.NewResourceFlowRepository(suite.db)
	suite.geoSvc = service.NewGeospatialService(suite.db, nil) // We'll test without geo features for basic functionality
	suite.geoCalc = geospatial.NewCalculatorWithDefaults()
	suite.transportSvc = service.NewTransportationService(suite.geoCalc)
	suite.matcher = service.NewSpatialResourceMatcher(
		nil, // geoRepo - not needed for basic matching tests
		suite.siteRepo,
		suite.flowRepo,
		suite.geoSvc,
		suite.transportSvc,
		suite.geoCalc,
	)

	// Create test organization
	org := &domain.Organization{ID: "org-test", Name: "Test Organization"}
	err := repository.NewOrganizationRepository(suite.db).Create(context.Background(), org)
	suite.Require().NoError(err)
}

func TestSpatialResourceMatcher(t *testing.T) {
	suite.Run(t, new(SpatialResourceMatcherTestSuite))
}

func (suite *SpatialResourceMatcherTestSuite) TestNewSpatialResourceMatcher() {
	assert.NotNil(suite.T(), suite.matcher)
}

func (suite *SpatialResourceMatcherTestSuite) TestSiteProvidesResource_PlatformDefault() {
	// Create test site
	site := &domain.Site{
		ID:         "site-test",
		Name:       "Test Site",
		Latitude:   52.5200,
		Longitude:  13.4050,
		SiteType:   domain.SiteTypeIndustrial,
		OwnerOrganizationID: "org-test",
	}

	err := suite.siteRepo.Create(context.Background(), site)
	suite.Require().NoError(err)

	// Test that site creation worked
	assert.NotNil(suite.T(), site)
}

func (suite *SpatialResourceMatcherTestSuite) setupTestSitesAndFlows() []*domain.Site {
	// Create test sites
	sites := []*domain.Site{
		{
			ID:         "site-provider-1",
			Name:       "Energy Provider Site",
			Latitude:   52.5200,
			Longitude:  13.4050,
			SiteType:   domain.SiteTypeIndustrial,
			OwnerOrganizationID: "org-test",
		},
		{
			ID:         "site-provider-2",
			Name:       "Waste Provider Site",
			Latitude:   52.5300,
			Longitude:  13.4150,
			SiteType:   domain.SiteTypeIndustrial,
			OwnerOrganizationID: "org-test",
		},
		{
			ID:         "site-consumer",
			Name:       "Manufacturing Site",
			Latitude:   52.5400,
			Longitude:  13.4250,
			SiteType:   domain.SiteTypeIndustrial,
			OwnerOrganizationID: "org-test",
		},
	}

	for _, site := range sites {
		err := suite.siteRepo.Create(context.Background(), site)
		suite.Require().NoError(err)
	}

	// Create test resource flows
	flows := []*domain.ResourceFlow{
		{
			ID:             "flow-energy-output",
			OrganizationID: "org-test",
			SiteID:         "site-provider-1",
			Direction:      domain.DirectionOutput,
			Type:           domain.TypeHeat,
			Quantity:       datatypes.JSON(`{"amount": 1000, "unit": "kWh"}`),
			EconomicData:   datatypes.JSON(`{"cost_out": 0.15}`),
		},
		{
			ID:             "flow-waste-output",
			OrganizationID: "org-test",
			SiteID:         "site-provider-2",
			Direction:      domain.DirectionOutput,
			Type:           domain.TypeBiowaste,
			Quantity:       datatypes.JSON(`{"amount": 500, "unit": "kg"}`),
			EconomicData:   datatypes.JSON(`{"cost_out": 0.05}`),
		},
		{
			ID:             "flow-energy-input",
			OrganizationID: "org-test",
			SiteID:         "site-consumer",
			Direction:      domain.DirectionInput,
			Type:           domain.TypeHeat,
			Quantity:       datatypes.JSON(`{"amount": 800, "unit": "kWh"}`),
			EconomicData:   datatypes.JSON(`{"cost_in": 0.20}`),
		},
	}

	for _, flow := range flows {
		err := suite.flowRepo.Create(context.Background(), flow)
		suite.Require().NoError(err)
	}

	return sites
}

func (suite *SpatialResourceMatcherTestSuite) TestFindNearbyResourceProviders_Energy() {
	suite.setupTestSitesAndFlows()

	results, err := suite.matcher.FindNearbyResourceProviders(
		context.Background(),
		domain.TypeHeat,
		52.5400, 13.4250, // Consumer location
		10.0,             // 10km radius
		domain.TransportModeTruck,
	)

	assert.NoError(suite.T(), err)
	assert.Len(suite.T(), results, 1) // Should find one energy provider

	result := results[0]
	assert.Equal(suite.T(), "flow-energy-output", result.ResourceFlow.ID)
	assert.Equal(suite.T(), "site-provider-1", result.ProviderSite.ID)
	assert.NotNil(suite.T(), result.SpatialMetrics)
	assert.Greater(suite.T(), result.SpatialMetrics.StraightLineDistance, 0.0)
	assert.Greater(suite.T(), result.MatchScore, 0.0)
}

func (suite *SpatialResourceMatcherTestSuite) TestFindNearbyResourceProviders_Waste() {
	suite.setupTestSitesAndFlows()

	results, err := suite.matcher.FindNearbyResourceProviders(
		context.Background(),
		domain.TypeBiowaste,
		52.5400, 13.4250,
		10.0,
		domain.TransportModeTruck,
	)

	assert.NoError(suite.T(), err)
	assert.Len(suite.T(), results, 1)

	result := results[0]
	assert.Equal(suite.T(), "flow-waste-output", result.ResourceFlow.ID)
	assert.Equal(suite.T(), "site-provider-2", result.ProviderSite.ID)
}

func (suite *SpatialResourceMatcherTestSuite) TestFindNearbyResourceProviders_NoMatches() {
	suite.setupTestSitesAndFlows()

	// Search for chemical resources (none exist)
	results, err := suite.matcher.FindNearbyResourceProviders(
		context.Background(),
		domain.TypeMaterials,
		52.5400, 13.4250,
		10.0,
		domain.TransportModeTruck,
	)

	assert.NoError(suite.T(), err)
	assert.Len(suite.T(), results, 0)
}

func (suite *SpatialResourceMatcherTestSuite) TestFindNearbyResourceProviders_OutOfRadius() {
	suite.setupTestSitesAndFlows()

	// Search with very small radius
	results, err := suite.matcher.FindNearbyResourceProviders(
		context.Background(),
		domain.TypeHeat,
		52.5400, 13.4250,
		0.1, // Very small radius
		domain.TransportModeTruck,
	)

	assert.NoError(suite.T(), err)
	assert.Len(suite.T(), results, 0) // No providers within 0.1km
}





func (suite *SpatialResourceMatcherTestSuite) TestSpatialMatchResult_JSONSerialization() {
	flow := &domain.ResourceFlow{
		ID:   "test-flow",
		Type: domain.TypeHeat,
	}

	providerSite := &domain.Site{
		ID:        "test-site",
		Name:      "Test Provider",
		Latitude:  52.5200,
		Longitude: 13.4050,
	}

	metrics := &service.SpatialMetrics{
		StraightLineDistance: 5.5,
		TransportCost:       42.5,
		EnvironmentalScore:  7.8,
	}

	result := &service.SpatialMatchResult{
		ResourceFlow:   flow,
		ProviderSite:   providerSite,
		SpatialMetrics: metrics,
		MatchScore:     8.2,
	}

	// This would test JSON serialization if we had JSON tags
	// For now, just verify the struct is properly constructed
	assert.NotNil(suite.T(), result.ResourceFlow)
	assert.NotNil(suite.T(), result.ProviderSite)
	assert.NotNil(suite.T(), result.SpatialMetrics)
	assert.Equal(suite.T(), 8.2, result.MatchScore)
}