package pipeline

import (
	"context"
	"net/http"
	"testing"

	"evobgp/internal/store"
)

func TestRefreshModule_AggregatesAllEnabledModules(t *testing.T) {
	t.Setenv("EVOBGP_ASN_RESOLVE", "0")

	m := store.NewMemory()
	m.SeedDemo()
	tenant, _, modIP, _, _ := m.DemoIDs()
	for _, mod := range m.ListModules(tenant) {
		if mod == nil || mod.ID == modIP {
			continue
		}
		disabled := false
		if _, err := m.UpdateModule(tenant, mod.ID, &store.ModulePatch{Enabled: &disabled}); err != nil {
			t.Fatal(err)
		}
	}

	mod2, err := m.CreateModule(tenant, &store.Module{Type: "IP_RANGES", Name: "extra-ip", Enabled: true, Priority: 30})
	if err != nil {
		t.Fatal(err)
	}
	if _, err := m.CreateIPRangeEntry(tenant, modIP, &store.IPRangeEntry{Prefix: "10.0.0.0/24"}); err != nil {
		t.Fatal(err)
	}
	if _, err := m.CreateIPRangeEntry(tenant, mod2.ID, &store.IPRangeEntry{Prefix: "192.168.0.0/24"}); err != nil {
		t.Fatal(err)
	}

	ctx := context.Background()
	before, _, _ := m.ListRevisions(tenant, "", "", 200)
	beforeN := len(before)

	rev1, err := RefreshModule(ctx, m, http.DefaultClient, tenant, modIP)
	if err != nil {
		t.Fatal(err)
	}
	after1, _, _ := m.ListRevisions(tenant, "", "", 200)
	if len(after1) != beforeN+1 {
		t.Fatalf("first refresh: want one new tenant revision, got %d -> %d", beforeN, len(after1))
	}
	px, _, _ := m.ListRevisionPrefixes(tenant, rev1, "", 1000)
	if len(px) != 2 {
		t.Fatalf("first refresh: want 2 aggregated prefixes, got %d: %+v", len(px), px)
	}

	rev2, err := RefreshModule(ctx, m, http.DefaultClient, tenant, mod2.ID)
	if err != nil {
		t.Fatal(err)
	}
	if rev2 == "" {
		t.Fatal("second refresh: expected non-empty revision id")
	}
	after2, _, _ := m.ListRevisions(tenant, "", "", 200)
	if len(after2) < len(after1) {
		t.Fatalf("second refresh: revisions count should not decrease, had %d now %d", len(after1), len(after2))
	}

	if _, err := m.CreateIPRangeEntry(tenant, mod2.ID, &store.IPRangeEntry{Prefix: "10.0.1.0/24"}); err != nil {
		t.Fatal(err)
	}
	rev3, err := RefreshModule(ctx, m, http.DefaultClient, tenant, mod2.ID)
	if err != nil {
		t.Fatal(err)
	}
	if rev3 == rev1 {
		t.Fatal("after prefix change, expected a new revision")
	}
	after3, _, _ := m.ListRevisions(tenant, "", "", 200)
	if len(after3) < len(after2) {
		t.Fatalf("third refresh: revisions count should not decrease, had %d now %d", len(after2), len(after3))
	}
	px3, _, _ := m.ListRevisionPrefixes(tenant, rev3, "", 1000)
	if len(px3) != 2 {
		t.Fatalf("third refresh: smart aggregation should merge adjacent /24, want 2 prefixes, got %d", len(px3))
	}
}

func TestSmartAggregatePrefixRows_RespectsCommunityAndSource(t *testing.T) {
	commA := "c-a"
	commB := "c-b"
	rows := []store.PrefixRow{
		{Prefix: "10.0.0.0/24", CommunityID: &commA, Source: "ip_range"},
		{Prefix: "10.0.1.0/24", CommunityID: &commA, Source: "ip_range"},
		{Prefix: "10.0.2.0/24", CommunityID: &commA, Source: "ip_range"},
		{Prefix: "10.0.3.0/24", CommunityID: &commA, Source: "ip_range"},
		{Prefix: "10.0.4.0/24", CommunityID: &commB, Source: "ip_range"},
		{Prefix: "10.0.5.0/24", CommunityID: &commB, Source: "cdn:x"},
	}
	out := smartAggregatePrefixRows(rows)
	got := make(map[string]struct{}, len(out))
	for _, r := range out {
		c := ""
		if r.CommunityID != nil {
			c = *r.CommunityID
		}
		got[r.Prefix+"|"+c+"|"+r.Source] = struct{}{}
	}
	// First four /24 collapse into /22 because attributes are identical.
	if _, ok := got["10.0.0.0/22|c-a|ip_range"]; !ok {
		t.Fatalf("expected merged prefix for c-a/ip_range, got: %+v", out)
	}
	// Different community/source must stay separate.
	if _, ok := got["10.0.4.0/24|c-b|ip_range"]; !ok {
		t.Fatalf("expected distinct prefix for c-b/ip_range, got: %+v", out)
	}
	if _, ok := got["10.0.5.0/24|c-b|cdn:x"]; !ok {
		t.Fatalf("expected distinct prefix for c-b/cdn:x, got: %+v", out)
	}
	if len(out) != 3 {
		t.Fatalf("expected 3 resulting rows, got %d: %+v", len(out), out)
	}
}