package config

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

func TestValidate_RouteKindsEmptyIsAllowed(t *testing.T) {
	cfg := &Config{
		Sources: []SourceConfig{
			{Name: "src1", Driver: "driver1", Every: Duration{Duration: time.Minute}},
		},
		Sinks: []SinkConfig{
			{Name: "sink1", Driver: "stdout"},
		},
		Routes: []RouteConfig{
			{Sink: "sink1", Kinds: nil},        // omitted
			{Sink: "sink1", Kinds: []string{}}, // explicit empty
		},
	}

	if err := cfg.Validate(); err != nil {
		t.Fatalf("expected no error, got: %v", err)
	}
}

func TestValidate_RouteKindsRejectsBlankEntries(t *testing.T) {
	cfg := &Config{
		Sources: []SourceConfig{
			{Name: "src1", Driver: "driver1", Every: Duration{Duration: time.Minute}},
		},
		Sinks: []SinkConfig{
			{Name: "sink1", Driver: "stdout"},
		},
		Routes: []RouteConfig{
			{Sink: "sink1", Kinds: []string{"observation", "   ", "alert"}},
		},
	}

	err := cfg.Validate()
	if err == nil {
		t.Fatalf("expected error, got nil")
	}
	if !strings.Contains(err.Error(), "routes[0].kinds[1]") {
		t.Fatalf("expected error to mention blank kind entry, got: %v", err)
	}
}

func TestValidate_SourceModePollRequiresEvery(t *testing.T) {
	cfg := &Config{
		Sources: []SourceConfig{
			{Name: "src1", Driver: "driver1", Mode: SourceModePoll},
		},
		Sinks: []SinkConfig{
			{Name: "sink1", Driver: "stdout"},
		},
	}

	err := cfg.Validate()
	if err == nil {
		t.Fatalf("expected error, got nil")
	}
	if !strings.Contains(err.Error(), `sources[0].every`) {
		t.Fatalf("expected error to mention sources[0].every, got: %v", err)
	}
}

func TestValidate_SourceModeStreamRejectsEvery(t *testing.T) {
	cfg := &Config{
		Sources: []SourceConfig{
			{
				Name:   "src1",
				Driver: "driver1",
				Mode:   SourceModeStream,
				Every:  Duration{Duration: time.Minute},
			},
		},
		Sinks: []SinkConfig{
			{Name: "sink1", Driver: "stdout"},
		},
	}

	err := cfg.Validate()
	if err == nil {
		t.Fatalf("expected error, got nil")
	}
	if !strings.Contains(err.Error(), `sources[0].every`) {
		t.Fatalf("expected error to mention sources[0].every, got: %v", err)
	}
}

func TestValidate_SourceModeRejectsUnknownValue(t *testing.T) {
	cfg := &Config{
		Sources: []SourceConfig{
			{
				Name:   "src1",
				Driver: "driver1",
				Mode:   SourceMode("batch"),
				Every:  Duration{Duration: time.Minute},
			},
		},
		Sinks: []SinkConfig{
			{Name: "sink1", Driver: "stdout"},
		},
	}

	err := cfg.Validate()
	if err == nil {
		t.Fatalf("expected error, got nil")
	}
	if !strings.Contains(err.Error(), `sources[0].mode`) {
		t.Fatalf("expected error to mention sources[0].mode, got: %v", err)
	}
}

func TestValidate_SourceKindAndKindsConflict(t *testing.T) {
	cfg := &Config{
		Sources: []SourceConfig{
			{
				Name:   "src1",
				Driver: "driver1",
				Every:  Duration{Duration: time.Minute},
				Kind:   "observation",
				Kinds:  []string{"forecast"},
			},
		},
		Sinks: []SinkConfig{
			{Name: "sink1", Driver: "stdout"},
		},
	}

	err := cfg.Validate()
	if err == nil {
		t.Fatalf("expected error, got nil")
	}
	if !strings.Contains(err.Error(), `sources[0].kind`) {
		t.Fatalf("expected error to mention sources[0].kind, got: %v", err)
	}
}

func TestValidate_SourceKindsRejectBlankEntries(t *testing.T) {
	cfg := &Config{
		Sources: []SourceConfig{
			{
				Name:   "src1",
				Driver: "driver1",
				Every:  Duration{Duration: time.Minute},
				Kinds:  []string{"observation", "   "},
			},
		},
		Sinks: []SinkConfig{
			{Name: "sink1", Driver: "stdout"},
		},
	}

	err := cfg.Validate()
	if err == nil {
		t.Fatalf("expected error, got nil")
	}
	if !strings.Contains(err.Error(), `sources[0].kinds[1]`) {
		t.Fatalf("expected error to mention sources[0].kinds[1], got: %v", err)
	}
}