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 EnvironmentalImpactServiceTestSuite struct {
	suite.Suite
	db            *gorm.DB
	siteRepo      domain.SiteRepository
	geoRepo       domain.GeographicalFeatureRepository
	geoCalc       geospatial.Calculator
	geospatialSvc *service.GeospatialService
	envSvc        *service.EnvironmentalImpactService
}

func (suite *EnvironmentalImpactServiceTestSuite) SetupTest() {
	suite.db = testutils.SetupTestDBWithTestcontainers(suite.T())
	suite.siteRepo = repository.NewSiteRepository(suite.db)
	suite.geoRepo = repository.NewGeographicalFeatureRepository(suite.db)
	suite.geospatialSvc = service.NewGeospatialService(suite.db, suite.geoRepo)
	suite.geoCalc = geospatial.NewCalculatorWithDefaults()

	suite.envSvc = service.NewEnvironmentalImpactService(suite.geoRepo, suite.siteRepo, suite.geospatialSvc, suite.geoCalc)

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

func TestEnvironmentalImpactService(t *testing.T) {
	suite.Run(t, new(EnvironmentalImpactServiceTestSuite))
}

func (suite *EnvironmentalImpactServiceTestSuite) TestNewEnvironmentalImpactService() {
	assert.NotNil(suite.T(), suite.envSvc)
}

func (suite *EnvironmentalImpactServiceTestSuite) setupTestSites() []*domain.Site {
	sites := []*domain.Site{
		{
			ID:                  "site-high-impact",
			Name:                "High Impact Industrial Site",
			Latitude:            52.5200,
			Longitude:           13.4050,
			SiteType:            domain.SiteTypeIndustrial,
			OwnerOrganizationID: "org-env-test",
			EnvironmentalImpact: "high_impact",
		},
		{
			ID:                  "site-low-impact",
			Name:                "Low Impact Office Site",
			Latitude:            52.5300,
			Longitude:           13.4150,
			SiteType:            domain.SiteTypeOffice,
			OwnerOrganizationID: "org-env-test",
			EnvironmentalImpact: "low_impact",
		},
		{
			ID:                  "site-eco-friendly",
			Name:                "Eco-Friendly Site",
			Latitude:            52.5400,
			Longitude:           13.4250,
			SiteType:            domain.SiteTypeRetail,
			OwnerOrganizationID: "org-env-test",
			EnvironmentalImpact: "eco_friendly",
		},
	}

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

	return sites
}

func (suite *EnvironmentalImpactServiceTestSuite) setupTestGreenSpaces() {
	// Create some mock green space features
	// Note: In a real scenario, these would have actual geometry data
	greenSpaces := []*domain.GeographicalFeature{
		{
			ID:          "park-central",
			Name:        "Central Park",
			FeatureType: domain.GeographicalFeatureTypeGreenSpace,
			OSMType:     "way",
			OSMID:       "1001",
			Properties:  datatypes.JSON(`{"leisure": "park", "area": "large"}`),
			Source:      "osm",
		},
		{
			ID:          "park-small",
			Name:        "Small Park",
			FeatureType: domain.GeographicalFeatureTypeGreenSpace,
			OSMType:     "way",
			OSMID:       "1002",
			Properties:  datatypes.JSON(`{"leisure": "park", "area": "small"}`),
			Source:      "osm",
		},
	}

	for i, gs := range greenSpaces {
		err := suite.geoRepo.Create(context.Background(), gs)
		suite.Require().NoError(err)
		// Ensure the DB has a geometry for each green space so radius queries
		// return them during tests. Place them near 52.5200,13.4050 with small offsets
		lat := 52.5200 + float64(i)*0.001
		lng := 13.4050 + float64(i)*0.001
		// Update raw geometry via SQL (PostGIS required in test DB template)
		if err := suite.db.Exec(`UPDATE geographical_features SET geometry = ST_SetSRID(ST_MakePoint(?::double precision, ?::double precision), 4326) WHERE id = ?`, lng, lat, gs.ID).Error; err != nil {
			// If updating geometry fails (e.g., PostGIS not available), continue — tests will adapt
			suite.T().Logf("warning: could not set geometry for test green space %s: %v", gs.ID, err)
		}
	}
}

func (suite *EnvironmentalImpactServiceTestSuite) TestCalculateFacilityEnvironmentalScore_HighImpact() {
	sites := suite.setupTestSites()

	score, err := suite.envSvc.CalculateFacilityEnvironmentalScore(context.Background(), sites[0].Latitude, sites[0].Longitude)
	assert.NoError(suite.T(), err)
	assert.GreaterOrEqual(suite.T(), score.OverallScore, 0.0)
	assert.LessOrEqual(suite.T(), score.OverallScore, 10.0)
	// High impact sites should have lower scores
	assert.Less(suite.T(), score.OverallScore, 5.0)
}

func (suite *EnvironmentalImpactServiceTestSuite) TestCalculateFacilityEnvironmentalScore_LowImpact() {
	sites := suite.setupTestSites()

	score, err := suite.envSvc.CalculateFacilityEnvironmentalScore(context.Background(), sites[1].Latitude, sites[1].Longitude)
	assert.NoError(suite.T(), err)
	assert.GreaterOrEqual(suite.T(), score.OverallScore, 0.0)
	assert.LessOrEqual(suite.T(), score.OverallScore, 10.0)
	// Low impact sites should have higher scores
	assert.Greater(suite.T(), score.OverallScore, 5.0)
}

func (suite *EnvironmentalImpactServiceTestSuite) TestCalculateFacilityEnvironmentalScore_EcoFriendly() {
	sites := suite.setupTestSites()

	score, err := suite.envSvc.CalculateFacilityEnvironmentalScore(context.Background(), sites[2].Latitude, sites[2].Longitude)
	assert.NoError(suite.T(), err)
	assert.GreaterOrEqual(suite.T(), score.OverallScore, 0.0)
	assert.LessOrEqual(suite.T(), score.OverallScore, 10.0)
	// Eco-friendly sites should have highest scores
	assert.Greater(suite.T(), score.OverallScore, 7.0)
}

func (suite *EnvironmentalImpactServiceTestSuite) TestCalculateFacilityEnvironmentalScore_NonExistentSite() {
	// For non-existent sites, we test with coordinates directly since the method takes coordinates
	_, err := suite.envSvc.CalculateFacilityEnvironmentalScore(context.Background(), 0.0, 0.0)
	// This should work since it doesn't depend on site existence, just coordinates
	assert.NoError(suite.T(), err)
}

func (suite *EnvironmentalImpactServiceTestSuite) TestCalculateSiteEnvironmentalScore_DefaultScore() {
	// Create a site without environmental impact data
	site := &domain.Site{
		ID:                  "site-no-data",
		Name:                "Site Without Data",
		Latitude:            52.5500,
		Longitude:           13.4350,
		SiteType:            domain.SiteTypeMixed,
		OwnerOrganizationID: "org-env-test",
		EnvironmentalImpact: "", // No environmental data
	}

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

	score, err := suite.envSvc.CalculateFacilityEnvironmentalScore(context.Background(), site.Latitude, site.Longitude)
	assert.NoError(suite.T(), err)
	assert.GreaterOrEqual(suite.T(), score.OverallScore, 0.0)
	assert.LessOrEqual(suite.T(), score.OverallScore, 10.0)
	// Sites without data should get a default score around 5.0
	assert.InDelta(suite.T(), 5.0, score.OverallScore, 2.0)
}

func (suite *EnvironmentalImpactServiceTestSuite) TestEnvironmentalScoreCalculation_Components() {
	// Test the scoring algorithm with different site configurations
	testCases := []struct {
		name                string
		environmentalImpact string
		expectedMin         float64
		expectedMax         float64
	}{
		{"High Impact", "high_impact", 0.0, 3.0},
		{"Low Impact", "low_impact", 4.0, 7.0},
		{"Eco Friendly", "eco_friendly", 7.0, 10.0},
		{"Unknown", "unknown_type", 3.0, 6.0},
	}

	for i, tc := range testCases {
		suite.T().Run(tc.name, func(t *testing.T) {
			site := &domain.Site{
				ID:                  "test-site-" + tc.name,
				Name:                tc.name + " Site",
				Latitude:            52.5200 + float64(i)*0.01,
				Longitude:           13.4050 + float64(i)*0.01,
				SiteType:            domain.SiteTypeIndustrial,
				OwnerOrganizationID: "org-env-test",
				EnvironmentalImpact: tc.environmentalImpact,
			}

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

			// Quick check: our repository should find the site by ID
			got, gerr := suite.siteRepo.GetByID(context.Background(), site.ID)
			assert.NoError(t, gerr)
			assert.Equal(t, tc.environmentalImpact, got.EnvironmentalImpact, "site EnvironmentalImpact persisted correctly")

			score, err := suite.envSvc.CalculateFacilityEnvironmentalScore(context.Background(), site.Latitude, site.Longitude)
			assert.NoError(t, err)
			assert.GreaterOrEqual(t, score.OverallScore, tc.expectedMin, "Score should be >= %f for %s", tc.expectedMin, tc.name)
			assert.LessOrEqual(t, score.OverallScore, tc.expectedMax, "Score should be <= %f for %s", tc.expectedMax, tc.name)
		})
	}
}

func (suite *EnvironmentalImpactServiceTestSuite) TestEnvironmentalScoreCalculation_ScoreNormalization() {
	// Test that scores are properly normalized to 0-10 range
	sites := suite.setupTestSites()

	for _, site := range sites {
		score, err := suite.envSvc.CalculateFacilityEnvironmentalScore(context.Background(), site.Latitude, site.Longitude)
		suite.T().Run("ScoreNormalization_"+site.ID, func(t *testing.T) {
			assert.NoError(t, err)
			assert.GreaterOrEqual(t, score.OverallScore, 0.0, "Score should be >= 0")
			assert.LessOrEqual(t, score.OverallScore, 10.0, "Score should be <= 10")
		})
	}
}

func (suite *EnvironmentalImpactServiceTestSuite) TestGreenSpaceStatistics_IncludesExpectedFields() {
	suite.setupTestGreenSpaces()

	// Test that green spaces are created and can be retrieved
	greenSpaces, err := suite.geoRepo.GetGreenSpacesWithinRadius(context.Background(), 52.5200, 13.4050, 10.0)
	assert.NoError(suite.T(), err)

	// Should have at least 2 green spaces from our setup
	assert.GreaterOrEqual(suite.T(), len(greenSpaces), 2, "Should have at least 2 green spaces")
}

func (suite *EnvironmentalImpactServiceTestSuite) TestEnvironmentalImpactService_HandlesEmptyDatabase() {
	// Test that CalculateFacilityEnvironmentalScore works even with coordinates not near green spaces
	score, err := suite.envSvc.CalculateFacilityEnvironmentalScore(context.Background(), 0.0, 0.0)
	assert.NoError(suite.T(), err) // Should work with any coordinates
	assert.NotNil(suite.T(), score)

	// Test that green space queries work with empty database
	greenSpaces, err := suite.geoRepo.GetGreenSpacesWithinRadius(context.Background(), 52.5200, 13.4050, 1.0)
	assert.NoError(suite.T(), err)
	assert.Equal(suite.T(), 0, len(greenSpaces))
}