package metrics

import (
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

// TestExporterHealthzAndEscaping runs one orchestration or CLI step.
// Signature: TestExporterHealthzAndEscaping(t *testing.T).
// Why: covers health endpoint and label escaping branches in metrics renderer.
func TestExporterHealthzAndEscaping(t *testing.T) {
	e := New()
	e.UpdateSample(Sample{
		Name:      `Sta"tera`,
		Target:    `statera\host`,
		Status:    `O"B`,
		LastError: "x",
	})

	h := e.Handler("/custom")
	healthReq := httptest.NewRequest(http.MethodGet, "/healthz", nil)
	healthRR := httptest.NewRecorder()
	h.ServeHTTP(healthRR, healthReq)
	if healthRR.Code != http.StatusOK || strings.TrimSpace(healthRR.Body.String()) != "ok" {
		t.Fatalf("unexpected health response: code=%d body=%q", healthRR.Code, healthRR.Body.String())
	}

	metricsReq := httptest.NewRequest(http.MethodGet, "/custom", nil)
	metricsRR := httptest.NewRecorder()
	h.ServeHTTP(metricsRR, metricsReq)
	body := metricsRR.Body.String()
	if !strings.Contains(body, `source="Sta\\\"tera"`) {
		t.Fatalf("expected escaped source label, got:\n%s", body)
	}
	if !strings.Contains(body, `target="statera\\\\host"`) {
		t.Fatalf("expected escaped target label, got:\n%s", body)
	}
	if !strings.Contains(body, "ananke_ups_error") {
		t.Fatalf("expected error metric line in output")
	}
}

// TestBoolNumAndSafeHelpers runs one orchestration or CLI step.
// Signature: TestBoolNumAndSafeHelpers(t *testing.T).
// Why: directly covers remaining helper branches.
func TestBoolNumAndSafeHelpers(t *testing.T) {
	if boolNum(true) != 1 || boolNum(false) != 0 {
		t.Fatalf("unexpected boolNum values")
	}
	if got := safe(`a"b\c`); got != `a\"b\\c` {
		t.Fatalf("unexpected escaped string: %q", got)
	}
}

// TestExporterAppendsQualityGateMetrics runs one orchestration or CLI step.
// Signature: TestExporterAppendsQualityGateMetrics(t *testing.T).
// Why: verifies quality-gate metrics are surfaced on /metrics for Grafana suite
// pass-rate tracking.
func TestExporterAppendsQualityGateMetrics(t *testing.T) {
	tmp := t.TempDir()
	metricsPath := filepath.Join(tmp, "quality-gate.prom")
	content := strings.Join([]string{
		`# HELP ananke_quality_gate_runs_total Total quality gate runs by status.`,
		`# TYPE ananke_quality_gate_runs_total counter`,
		`ananke_quality_gate_runs_total{suite="ananke",status="ok"} 10`,
		`ananke_quality_gate_runs_total{suite="ananke",status="failed"} 2`,
		"",
	}, "\n")
	if err := os.WriteFile(metricsPath, []byte(content), 0o600); err != nil {
		t.Fatalf("write quality metrics file: %v", err)
	}
	t.Setenv("ANANKE_QUALITY_METRICS_FILE", metricsPath)

	e := New()
	req := httptest.NewRequest(http.MethodGet, "/metrics", nil)
	rr := httptest.NewRecorder()
	e.Handler("/metrics").ServeHTTP(rr, req)
	body := rr.Body.String()
	if !strings.Contains(body, `ananke_quality_gate_runs_total{suite="ananke",status="ok"} 10`) {
		t.Fatalf("expected quality gate metrics appended to exporter output, got:\n%s", body)
	}
}

// TestExporterDefaultsQualityGateMetrics runs one orchestration or CLI step.
// Signature: TestExporterDefaultsQualityGateMetrics(t *testing.T).
// Why: ensures Grafana panels see zero-value quality-gate series instead of
// "no data" before host-side quality-gate files exist.
func TestExporterDefaultsQualityGateMetrics(t *testing.T) {
	t.Setenv("ANANKE_QUALITY_METRICS_FILE", filepath.Join(t.TempDir(), "missing.prom"))
	e := New()
	req := httptest.NewRequest(http.MethodGet, "/metrics", nil)
	rr := httptest.NewRecorder()
	e.Handler("/metrics").ServeHTTP(rr, req)
	body := rr.Body.String()
	if !strings.Contains(body, `ananke_quality_gate_runs_total{suite="ananke",status="ok"} 0`) {
		t.Fatalf("expected default ok=0 quality gate metric, got:\n%s", body)
	}
	if !strings.Contains(body, `ananke_quality_gate_runs_total{suite="ananke",status="failed"} 0`) {
		t.Fatalf("expected default failed=0 quality gate metric, got:\n%s", body)
	}
}