package store

import "testing"

func TestRuntimeCandidateLoadUsesMaxLimitedMetric(t *testing.T) {
	candidate := RuntimeModelCandidate{}
	applyRuntimeCandidateLoad(&candidate, runtimeCandidateLoadInput{
		Policy: map[string]any{"rules": []any{
			map[string]any{"metric": "rpm", "limit": 100},
			map[string]any{"metric": "tpm_total", "limit": 1000},
			map[string]any{"metric": "concurrent", "limit": 10},
		}},
		RPMUsed:          40,
		RPMReserved:      10,
		TPMUsed:          900,
		ConcurrentActive: 3,
		QueuedWaiting:    2,
	})

	if !candidate.LoadLimited {
		t.Fatal("expected load to be limited when rate limit rules exist")
	}
	if candidate.LoadMetrics.RPMRatio != 0.5 {
		t.Fatalf("expected rpm ratio 0.5, got %v", candidate.LoadMetrics.RPMRatio)
	}
	if candidate.LoadMetrics.TPMRatio != 0.9 {
		t.Fatalf("expected tpm ratio 0.9, got %v", candidate.LoadMetrics.TPMRatio)
	}
	if candidate.LoadMetrics.ConcurrentRatio != 0.5 {
		t.Fatalf("expected concurrent ratio 0.5, got %v", candidate.LoadMetrics.ConcurrentRatio)
	}
	if candidate.LoadRatio != 0.9 {
		t.Fatalf("expected max load ratio 0.9, got %v", candidate.LoadRatio)
	}
}

func TestRuntimeCandidateSortingAvoidsFullCandidatesButKeepsFallback(t *testing.T) {
	candidates := []RuntimeModelCandidate{
		{
			PlatformID:       "high-priority-full",
			PlatformPriority: 1,
			LoadLimited:      true,
			LoadRatio:        1.2,
		},
		{
			PlatformID:       "lower-priority-available",
			PlatformPriority: 50,
			LoadLimited:      true,
			LoadRatio:        0.2,
		},
	}

	sortRuntimeModelCandidates(candidates)

	if candidates[0].PlatformID != "lower-priority-available" {
		t.Fatalf("expected non-full candidate to be tried first, got %+v", candidates)
	}
	if candidates[1].PlatformID != "high-priority-full" || !candidates[1].LoadAvoided {
		t.Fatalf("expected full high-priority candidate to remain as avoided fallback, got %+v", candidates)
	}
}