package spc

import (
	"strings"
	"testing"
	"time"
)

func TestDecodeGeoJSONExposesSPCPropertiesAndCompactGeometry(t *testing.T) {
	raw := readTestFile(t, "day1_cat.geojson")

	got, err := DecodeGeoJSON(raw)
	if err != nil {
		t.Fatalf("DecodeGeoJSON() error = %v", err)
	}
	if got.Type != "FeatureCollection" {
		t.Fatalf("Type = %q, want FeatureCollection", got.Type)
	}
	if len(got.Features) != 1 {
		t.Fatalf("Features length = %d, want 1", len(got.Features))
	}

	feature := got.Features[0]
	props := feature.Properties
	if props.ValidISO != "2026-06-11T13:00:00Z" {
		t.Fatalf("VALID_ISO = %q", props.ValidISO)
	}
	if props.ExpireISO != "2026-06-12T12:00:00Z" {
		t.Fatalf("EXPIRE_ISO = %q", props.ExpireISO)
	}
	if props.IssueISO != "2026-06-11T12:34:56Z" {
		t.Fatalf("ISSUE_ISO = %q", props.IssueISO)
	}
	if props.Forecaster != "SMITH" {
		t.Fatalf("FORECASTER = %q", props.Forecaster)
	}
	if props.Label != "SLGT" {
		t.Fatalf("LABEL = %q", props.Label)
	}
	if props.Label2 != "Slight Risk" {
		t.Fatalf("LABEL2 = %q", props.Label2)
	}
	if props.DN == nil || *props.DN != 3 {
		t.Fatalf("DN = %v, want 3", props.DN)
	}

	wantGeometry := `{"type":"Polygon","coordinates":[[[-91.0,38.0],[-90.0,38.0],[-90.0,39.0],[-91.0,39.0],[-91.0,38.0]]]}`
	if string(feature.Geometry) != wantGeometry {
		t.Fatalf("Geometry = %s, want %s", feature.Geometry, wantGeometry)
	}
	if strings.Contains(string(feature.Geometry), "\n") || strings.Contains(string(feature.Geometry), "  ") {
		t.Fatalf("Geometry is not compact: %q", feature.Geometry)
	}
}

func TestDecodeGeoJSONParsesSeverityRankString(t *testing.T) {
	raw := readTestFile(t, "day2_torn.geojson")

	got, err := DecodeGeoJSON(raw)
	if err != nil {
		t.Fatalf("DecodeGeoJSON() error = %v", err)
	}
	props := got.Features[0].Properties
	if props.DN == nil || *props.DN != 5 {
		t.Fatalf("DN = %v, want 5", props.DN)
	}
}

func TestIsEmptyGeometryCollection(t *testing.T) {
	tests := []struct {
		name string
		raw  string
		want bool
	}{
		{
			name: "empty geometry collection",
			raw:  `{"type":"GeometryCollection","geometries":[]}`,
			want: true,
		},
		{
			name: "non-empty geometry collection",
			raw:  `{"type":"GeometryCollection","geometries":[{"type":"Polygon","coordinates":[]} ]}`,
			want: false,
		},
		{
			name: "polygon",
			raw:  `{"type":"Polygon","coordinates":[]}`,
			want: false,
		},
		{
			name: "invalid json",
			raw:  `{`,
			want: false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := IsEmptyGeometryCollection([]byte(tt.raw)); got != tt.want {
				t.Fatalf("IsEmptyGeometryCollection() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestParseISOTimestampTrimsAndReturnsUTC(t *testing.T) {
	got, err := ParseISOTimestamp(" 2026-06-11T12:34:56Z ")
	if err != nil {
		t.Fatalf("ParseISOTimestamp() error = %v", err)
	}
	want := time.Date(2026, 6, 11, 12, 34, 56, 0, time.UTC)
	if !got.Equal(want) {
		t.Fatalf("ParseISOTimestamp() = %s, want %s", got, want)
	}
}