package db

import (
	"slices"
	"testing"
)

// TestFindingsPageAndStats exercises ListFindingsPage (filter/sort/paging) and
// FindingStats against the live dev PG. It tags its rows with a unique vulnclass
// so assertions are isolated from any pre-existing data, and cleans up after.
func TestFindingsPageAndStats(t *testing.T) {
	d, err := Open(testDSN(t))
	if err != nil {
		t.Skipf("postgres unavailable (%v) — skipping", err)
	}
	defer d.Close()

	const vc = "__test_vc_pagination__"
	// clean any leftovers from a prior aborted run, and clean up on exit
	cleanup := func() { _, _ = d.Exec(`DELETE FROM findings WHERE vulnclass=$1`, vc) }
	cleanup()
	defer cleanup()

	// Seed 6 findings under the marker vulnclass: 1 critical, 3 high, 2 low; 2 pending.
	// The critical row carries a name to verify round-trip.
	seed := []struct {
		sev, status, name string
	}{
		{"critical", "pending", "严重漏洞标题"},
		{"high", "resolved", ""},
		{"high", "resolved", ""},
		{"high", "pending", ""},
		{"low", "resolved", ""},
		{"low", "resolved", ""},
	}
	var ids []int64
	for i, s := range seed {
		id, err := d.AddFinding(0, 0, vc, s.name, s.sev, "summary", "poc", "tester", nil)
		if err != nil {
			t.Fatalf("AddFinding[%d]: %v", i, err)
		}
		if _, err := d.SetFindingStatus(id, s.status); err != nil {
			t.Fatalf("SetFindingStatus[%d]: %v", i, err)
		}
		ids = append(ids, id)
	}

	// Filter by our vulnclass → exactly the 6 seeded rows, paged 2 per page.
	p1, total, err := d.ListFindingsPage(FindingFilter{VulnClass: vc, Sort: "severity"}, 1, 2)
	if err != nil {
		t.Fatal(err)
	}
	if total != 6 {
		t.Fatalf("total: want 6, got %d", total)
	}
	if len(p1) != 2 {
		t.Fatalf("page1 size: want 2, got %d", len(p1))
	}
	// severity sort → critical first (with its name round-tripped), then high.
	if p1[0].Severity != "critical" {
		t.Fatalf("severity sort: want critical first, got %q", p1[0].Severity)
	}
	if p1[0].Name != "严重漏洞标题" {
		t.Fatalf("name round-trip: want 严重漏洞标题, got %q", p1[0].Name)
	}
	if p1[1].Severity != "high" {
		t.Fatalf("severity sort: want high second, got %q", p1[1].Severity)
	}

	// Combined filter: vulnclass + status=pending → 2 rows.
	pend, total, err := d.ListFindingsPage(FindingFilter{VulnClass: vc, Status: FindingPending}, 1, 50)
	if err != nil {
		t.Fatal(err)
	}
	if total != 2 || len(pend) != 2 {
		t.Fatalf("pending filter: want 2/2, got %d/%d", total, len(pend))
	}

	// Combined filter: vulnclass + severity=high → 3 rows.
	_, total, err = d.ListFindingsPage(FindingFilter{VulnClass: vc, Severity: "high"}, 1, 50)
	if err != nil {
		t.Fatal(err)
	}
	if total != 3 {
		t.Fatalf("high filter: want 3, got %d", total)
	}

	// Stats: whole-table, so assert our contribution is reflected (>=) and the
	// marker vulnclass is present.
	st, err := d.FindingStats()
	if err != nil {
		t.Fatal(err)
	}
	if st.Critical < 1 {
		t.Fatalf("stats critical undercount: %+v", st)
	}
	if st.Total < 6 || st.High < 3 || st.Low < 2 || st.Pending < 2 {
		t.Fatalf("stats undercount: %+v", st)
	}
	if !slices.Contains(st.VulnClasses, vc) {
		t.Fatalf("stats vulnclasses missing %q", vc)
	}

	// GetFinding: single-row fetch round-trips id/name/severity.
	one, err := d.GetFinding(ids[0])
	if err != nil {
		t.Fatal(err)
	}
	if one == nil || one.ID != ids[0] || one.Severity != "critical" || one.Name != "严重漏洞标题" {
		t.Fatalf("GetFinding mismatch: %+v", one)
	}
	if one.Report != "" {
		t.Fatalf("new finding report should be empty, got %q", one.Report)
	}
	// report column round-trips through GetFinding.
	if _, err := d.Exec(`UPDATE findings SET report=$1 WHERE id=$2`, "# 报告\n正文", ids[0]); err != nil {
		t.Fatal(err)
	}
	if one, _ = d.GetFinding(ids[0]); one.Report != "# 报告\n正文" {
		t.Fatalf("report not read back: %q", one.Report)
	}
	if miss, err := d.GetFinding(-1); err != nil || miss != nil {
		t.Fatalf("GetFinding(-1): want nil,nil got %+v,%v", miss, err)
	}

	// SetFindingSeverity: standalone row updates; 0 rows for unknown id.
	if n, err := d.SetFindingSeverity(ids[0], "high"); err != nil || n != 1 {
		t.Fatalf("SetFindingSeverity: want 1,nil got %d,%v", n, err)
	}
	one, _ = d.GetFinding(ids[0])
	if one.Severity != "high" {
		t.Fatalf("severity not updated: %q", one.Severity)
	}
	if n, err := d.SetFindingSeverity(-1, "low"); err != nil || n != 0 {
		t.Fatalf("SetFindingSeverity(-1): want 0,nil got %d,%v", n, err)
	}
}