package router

import (
	"fmt"
	"strings"
	"testing"
	"time"

	"gitea.mynodes.xyz/ilker/llmgw/internal/store"
)

func keptBody(t *testing.T, rt *Router, id string) (store.RequestBody, bool) {
	t.Helper()
	deadline := time.Now().Add(3 * time.Second)
	for {
		b, err := rt.store.RequestBodyByID(t.Context(), id)
		if err == nil {
			return b, true
		}
		if time.Now().After(deadline) {
			return store.RequestBody{}, false
		}
		time.Sleep(20 * time.Millisecond)
	}
}

func TestAProjectThatAsksKeepsItsRequestsAndTheyReplay(t *testing.T) {
	e := newFakeEngine(t, "qwen2.5-14b-instruct")
	rt, secret := pricedRouter(t, e.srv.URL)
	h := rt.Handler()
	project := mustProjectOf(t, rt, "key-1")

	send := func(id string) {
		rec := post(t, h, map[string]any{"model": "q14", "messages": []any{
			map[string]any{"role": "user", "content": "what is 2+2"}}},
			map[string]string{"Authorization": "Bearer " + secret, "X-Request-Id": id})
		if rec.Code != 200 {
			t.Fatalf("%d %s", rec.Code, rec.Body.String())
		}
	}
	send("before")
	if _, ok := keptBody(t, rt, "before"); ok {
		t.Fatal("a request was kept by a project that keeps none")
	}

	if err := rt.store.SetRequestLog(t.Context(), project, 24, 1); err != nil {
		t.Fatal(err)
	}
	rt.reqLogs.by = nil
	send("kept-1")
	b, ok := keptBody(t, rt, "kept-1")
	if !ok {
		t.Fatal("not kept")
	}
	if !strings.Contains(b.Request, "what is 2+2") || b.Response != "hi" || b.Status != 200 ||
		b.ServedModel != "qwen2.5-14b-instruct" || b.Path != "/v1/chat/completions" {
		t.Errorf("kept %+v", b)
	}
	if b.ExpiresAt.Sub(b.At) != 24*time.Hour {
		t.Errorf("kept for %s", b.ExpiresAt.Sub(b.At))
	}

	status, body, _, err := rt.Replay(t.Context(), b.Path, "q14", []byte(b.Request))
	if err != nil || status != 200 || !strings.Contains(string(body), "hi") {
		t.Errorf("replay: %d %s %v", status, body, err)
	}
	if _, _, _, err := rt.Replay(t.Context(), "/v1/files", "q14", nil); err == nil {
		t.Error("a non-inference path was replayed")
	}

	// A small share keeps few.
	_ = rt.store.SetRequestLog(t.Context(), project, 24, 0.05)
	rt.reqLogs.by = nil
	for i := range 100 {
		send(fmt.Sprintf("s-%d", i))
	}
	time.Sleep(200 * time.Millisecond)
	n := 0
	for i := range 100 {
		if _, err := rt.store.RequestBodyByID(t.Context(), fmt.Sprintf("s-%d", i)); err == nil {
			n++
		}
	}
	if n == 0 || n > 20 {
		t.Errorf("kept %d of 100 at 5%%", n)
	}

	// Off: what was kept goes at the next prune.
	_ = rt.store.SetRequestLog(t.Context(), project, 0, 0)
	if _, err := rt.store.PruneRequestBodies(t.Context(), time.Now()); err != nil {
		t.Fatal(err)
	}
	if _, err := rt.store.RequestBodyByID(t.Context(), "kept-1"); err == nil {
		t.Error("a project that stopped keeping requests still has them after a prune")
	}
}