package runner

import (
	"context"
	"testing"

	"github.com/easyai/easyai-ai-gateway/apps/api/internal/clients"
	"github.com/easyai/easyai-ai-gateway/apps/api/internal/store"
)

func TestTokenUsageAmountsUsesActualUsageForTPM(t *testing.T) {
	got := tokenUsageAmounts(clients.Usage{InputTokens: 12, OutputTokens: 8, TotalTokens: 21})

	if got["tpm_input"] != 12 {
		t.Fatalf("expected input token amount 12, got %v", got["tpm_input"])
	}
	if got["tpm_output"] != 8 {
		t.Fatalf("expected output token amount 8, got %v", got["tpm_output"])
	}
	if got["tpm_total"] != 21 {
		t.Fatalf("expected total token amount 21, got %v", got["tpm_total"])
	}
}

func TestTokenUsageAmountsFallsBackToInputOutputTotal(t *testing.T) {
	got := tokenUsageAmounts(clients.Usage{InputTokens: 3, OutputTokens: 5})

	if got["tpm_total"] != 8 {
		t.Fatalf("expected total token fallback 8, got %v", got["tpm_total"])
	}
}

func TestBillingsSplitsCachedInputTokens(t *testing.T) {
	service := &Service{}
	candidate := store.RuntimeModelCandidate{
		ModelName: "test-model",
		BillingConfig: map[string]any{
			"textInputPer1k":       1.0,
			"textCachedInputPer1k": 0.25,
			"textOutputPer1k":      2.0,
		},
	}
	response := clients.Response{
		Usage: clients.Usage{
			InputTokens:       1000,
			CachedInputTokens: 400,
			OutputTokens:      500,
			TotalTokens:       1500,
		},
	}

	lines := service.billings(context.Background(), nil, "chat.completions", nil, candidate, response, false)

	if len(lines) != 3 {
		t.Fatalf("expected uncached input, cached input, and output lines, got %+v", lines)
	}
	uncached, _ := lines[0].(map[string]any)
	cached, _ := lines[1].(map[string]any)
	output, _ := lines[2].(map[string]any)
	if uncached["resourceType"] != "text_input" || uncached["quantity"] != 600 || uncached["amount"] != 0.6 {
		t.Fatalf("unexpected uncached input billing line: %+v", uncached)
	}
	if cached["resourceType"] != "text_cached_input" || cached["quantity"] != 400 || cached["amount"] != 0.1 {
		t.Fatalf("unexpected cached input billing line: %+v", cached)
	}
	if output["resourceType"] != "text_output" || output["quantity"] != 500 || output["amount"] != 1.0 {
		t.Fatalf("unexpected output billing line: %+v", output)
	}
}

func TestBillingsDefaultsCachedInputPriceToOneTenthOfInputPrice(t *testing.T) {
	service := &Service{}
	candidate := store.RuntimeModelCandidate{
		ModelName: "test-model",
		BillingConfig: map[string]any{
			"textInputPer1k":  1.0,
			"textOutputPer1k": 2.0,
		},
	}
	response := clients.Response{
		Usage: clients.Usage{
			InputTokens:       1000,
			CachedInputTokens: 400,
			OutputTokens:      500,
			TotalTokens:       1500,
		},
	}

	lines := service.billings(context.Background(), nil, "chat.completions", nil, candidate, response, false)

	if len(lines) != 3 {
		t.Fatalf("expected uncached input, cached input, and output lines, got %+v", lines)
	}
	cached, _ := lines[1].(map[string]any)
	if cached["resourceType"] != "text_cached_input" || cached["quantity"] != 400 || cached["amount"] != 0.04 {
		t.Fatalf("unexpected cached input fallback billing line: %+v", cached)
	}
}

func TestEffectiveRateLimitPolicyTreatsEmptyRuntimePolicyAsUnlimited(t *testing.T) {
	policy := effectiveRateLimitPolicy(store.RuntimeModelCandidate{
		PlatformRateLimitPolicy: map[string]any{"rules": []any{
			map[string]any{"metric": "rpm", "limit": 500},
		}},
		RuntimePolicySetID:     "runtime-policy-1",
		RuntimeRateLimitPolicy: map[string]any{"rules": []any{}},
	})

	if hasRules(policy) {
		t.Fatalf("expected empty runtime policy to clear inherited limits, got %+v", policy)
	}
}

func TestReservationsFromPolicySkipsNonPositiveLimits(t *testing.T) {
	reservations := reservationsFromPolicy(
		"platform_model",
		"model-1",
		"Model 1",
		nil,
		map[string]any{"rules": []any{
			map[string]any{"metric": "rpm", "limit": -1},
			map[string]any{"metric": "tpm_total", "limit": 0},
			map[string]any{"metric": "concurrent", "limit": 2},
		}},
		map[string]any{"prompt": "hello"},
	)

	if len(reservations) != 1 {
		t.Fatalf("expected only the positive concurrent rule to reserve, got %+v", reservations)
	}
	if reservations[0].Metric != "concurrent" || reservations[0].Limit != 2 {
		t.Fatalf("expected concurrent reservation with limit 2, got %+v", reservations[0])
	}
}