package app

import (
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestGenerationTaskLogFieldsUsesStableStructuredKeys(t *testing.T) {
	fields := GenerationTaskLogFields(GenerationTaskLogContext{
		TaskID:        11,
		TenantID:      22,
		OperatorID:    33,
		ArticleID:     44,
		ReservationID: 55,
		TaskType:      "template",
		Stage:         "llm_generate",
		AttemptCount:  2,
		LeaseOwner:    "worker-1",
		StatusBefore:  "running",
		StatusAfter:   "failed",
		Result:        GenerationTaskResultFailure,
		AnomalyType:   "article_failed_task_running",
		Severity:      "critical",
	})

	values := map[string]any{}
	for _, field := range fields {
		values[field.Key] = field.Interface
		if field.String != "" {
			values[field.Key] = field.String
		}
		if field.Integer != 0 {
			values[field.Key] = field.Integer
		}
	}

	assert.Equal(t, "article_generation", values["event_domain"])
	assert.Equal(t, int64(11), values["task_id"])
	assert.Equal(t, int64(22), values["tenant_id"])
	assert.Equal(t, int64(44), values["article_id"])
	assert.Equal(t, "template", values["task_type"])
	assert.Equal(t, "llm_generate", values["stage"])
	assert.Equal(t, "failed", values["status_after"])
	assert.Equal(t, "critical", values["severity"])
}

func TestGenerationTaskMetricsRecordsEventsAndPrometheus(t *testing.T) {
	resetGenerationTaskMetricsForTest()
	t.Cleanup(resetGenerationTaskMetricsForTest)

	RecordGenerationTaskEvent(GenerationTaskEventTransition, GenerationTaskLogContext{
		TaskType:    "template",
		Stage:       "worker_claim",
		StatusAfter: GenerationTaskStatusRunning,
		Result:      GenerationTaskResultSuccess,
	})
	RecordGenerationTaskEvent(GenerationTaskEventCleanupFailure, GenerationTaskLogContext{
		TaskType: "template",
		Stage:    "refund_reservation",
		Result:   GenerationTaskResultFailure,
		Severity: "critical",
	})
	RecordGenerationTaskEvent(GenerationTaskEventStateAnomaly, GenerationTaskLogContext{
		TaskType:    "template",
		Stage:       "state_check",
		AnomalyType: "completed_task_missing_version",
		Severity:    "critical",
	})

	snapshot := GenerationTaskMetricsSnapshotValue()
	assert.Equal(t, int64(1), snapshot.TransitionTotal)
	assert.Equal(t, int64(1), snapshot.CleanupFailureTotal)
	assert.Equal(t, int64(1), snapshot.StateAnomalyTotal)
	assert.Equal(t, "state_anomaly", snapshot.LastEvent)
	assert.Equal(t, "completed_task_missing_version", snapshot.LastAnomalyType)
	assert.NotNil(t, snapshot.LastEventAt)

	prometheus := GenerationTaskMetricsPrometheus()
	assert.Contains(t, prometheus, "article_generation_task_transitions_total 1")
	assert.Contains(t, prometheus, "article_generation_task_cleanup_failures_total 1")
	assert.Contains(t, prometheus, "article_generation_task_state_anomalies_total 1")
	lastEventLine := findPrometheusMetricLine(prometheus, "article_generation_task_last_event_info")
	assert.Contains(t, lastEventLine, `event="state_anomaly"`)
	assert.Contains(t, lastEventLine, `task_type="template"`)
	assert.Contains(t, lastEventLine, `stage="state_check"`)
	assert.Contains(t, lastEventLine, `result=""`)
	assert.Contains(t, lastEventLine, `anomaly_type="completed_task_missing_version"`)
	assert.Contains(t, lastEventLine, `severity="critical"`)
	assert.True(t, strings.HasSuffix(lastEventLine, " 1"), lastEventLine)
}

func findPrometheusMetricLine(output, metricName string) string {
	for _, line := range strings.Split(output, "\n") {
		if strings.HasPrefix(line, metricName+"{") || strings.HasPrefix(line, metricName+" ") {
			return line
		}
	}
	return ""
}