package main

// api_stats_test.go — REST shape of /api/sessions/:id/stats and /api/stats.

import (
	"encoding/json"
	"net/http"
	"testing"
)

func TestAPISessionStatsShape(t *testing.T) {
	ts, store := newTestServer(t)
	appendAgentEnd(t, store, "s1", 1, `{"usage":{"inputTokens":1200,"outputTokens":340,"totalCost":0.25}}`)
	appendAgentEnd(t, store, "s1", 2, `{}`)

	code, body := apiReq(t, http.MethodGet, ts.URL+"/api/sessions/s1/stats", testToken, "")
	if code != http.StatusOK {
		t.Fatalf("stats status = %d", code)
	}
	var stats map[string]any
	if err := json.Unmarshal([]byte(body), &stats); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if stats["turns"].(float64) != 2 ||
		stats["inputTokens"].(float64) != 1200 ||
		stats["outputTokens"].(float64) != 340 ||
		stats["totalCost"].(float64) != 0.25 {
		t.Fatalf("stats = %v", stats)
	}
	if _, ok := stats["sessionsCount"]; ok {
		t.Fatalf("per-session stats must not carry sessionsCount: %v", stats)
	}

	// unknown session: 200 with zeros (matches events endpoint behavior)
	code, body = apiReq(t, http.MethodGet, ts.URL+"/api/sessions/ghost/stats", testToken, "")
	if code != http.StatusOK {
		t.Fatalf("ghost status = %d", code)
	}
	var ghost map[string]any
	if err := json.Unmarshal([]byte(body), &ghost); err != nil {
		t.Fatalf("decode ghost: %v", err)
	}
	if len(ghost) != 4 || ghost["turns"].(float64) != 0 {
		t.Fatalf("ghost stats = %v, want four zero fields", ghost)
	}
}

func TestAPIStatsTotalsAndOnlineCount(t *testing.T) {
	ts, store := newTestServer(t)
	appendAgentEnd(t, store, "s1", 1, `{"usage":{"inputTokens":1200000,"outputTokens":340000,"totalCost":4.2}}`)
	appendAgentEnd(t, store, "s2", 1, `{"usage":{"inputTokens":50,"outputTokens":10,"totalCost":0}}`)

	get := func() map[string]any {
		t.Helper()
		code, body := apiReq(t, http.MethodGet, ts.URL+"/api/stats", testToken, "")
		if code != http.StatusOK {
			t.Fatalf("/api/stats status = %d", code)
		}
		var m map[string]any
		if err := json.Unmarshal([]byte(body), &m); err != nil {
			t.Fatalf("decode: %v", err)
		}
		return m
	}

	totals := get()
	if totals["turns"].(float64) != 2 ||
		totals["inputTokens"].(float64) != 1200050 ||
		totals["outputTokens"].(float64) != 340010 ||
		totals["totalCost"].(float64) != 4.2 ||
		totals["sessionsCount"].(float64) != 2 {
		t.Fatalf("totals = %v", totals)
	}
	if totals["onlineCount"].(float64) != 0 {
		t.Fatalf("onlineCount = %v, want 0 with no agents", totals["onlineCount"])
	}

	// one registered agent connection must show up as online
	ws := dialAgent(t, ts)
	if err := ws.WriteJSON(helloFrame("s-live")); err != nil {
		t.Fatalf("hello: %v", err)
	}
	if _, _, err := ws.ReadMessage(); err != nil { // welcome
		t.Fatalf("welcome: %v", err)
	}
	online := get()
	if online["onlineCount"].(float64) != 1 {
		t.Fatalf("onlineCount = %v, want 1 after hello", online["onlineCount"])
	}
}

func TestAPIStatsClosedStore500(t *testing.T) {
	ts, store := newTestServer(t)
	if err := store.Close(); err != nil {
		t.Fatalf("close store: %v", err)
	}
	if code, _ := apiReq(t, http.MethodGet, ts.URL+"/api/stats", testToken, ""); code != http.StatusInternalServerError {
		t.Fatal("stats with broken store must 500")
	}
	if code, _ := apiReq(t, http.MethodGet, ts.URL+"/api/sessions/s1/stats", testToken, ""); code != http.StatusInternalServerError {
		t.Fatal("session stats with broken store must 500")
	}
}