package aggregate

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

	"github.com/telemt/telemt-api/internal/config"
)

func TestHandlerResolveAndFetch(t *testing.T) {
	up := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/v1/stats/users" {
			http.NotFound(w, r)
			return
		}
		_ = json.NewEncoder(w).Encode(map[string]any{
			"ok":       true,
			"data":     []map[string]any{{"username": "u1", "total_octets": 42, "current_connections": 0}},
			"revision": "abc",
		})
	}))
	defer up.Close()

	cfg := &config.Config{
		Servers: []config.Server{
			{Alias: "test", BaseURL: up.URL, PathPrefix: "/v1"},
		},
	}
	if err := cfg.Validate(); err != nil {
		t.Fatal(err)
	}
	parsed, err := cfg.Parse()
	if err != nil {
		t.Fatal(err)
	}
	h := NewHandler(parsed, up.Client(), nil, 0)
	req := httptest.NewRequest(http.MethodGet, "/api/agg/summary?aliases=test", nil)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("status %d body %s", rec.Code, rec.Body.String())
	}
	var env struct {
		OK   bool           `json:"ok"`
		Data SummaryData    `json:"data"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &env); err != nil {
		t.Fatal(err)
	}
	if !env.OK || env.Data.FleetTotalMegabytes != octetsToMegabytes(42) {
		t.Fatalf("data: %+v", env.Data)
	}
}

func TestHandlerFleetStatus(t *testing.T) {
	up := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/v1/health":
			_ = json.NewEncoder(w).Encode(map[string]any{
				"ok": true, "data": map[string]any{"status": "ok", "read_only": false}, "revision": "rh",
			})
		case "/v1/system/info":
			_ = json.NewEncoder(w).Encode(map[string]any{
				"ok": true,
				"data": map[string]any{
					"version": "1.0.0", "target_arch": "amd64", "target_os": "linux", "build_profile": "release",
					"process_started_at_epoch_secs": 1, "uptime_seconds": 10.0, "config_path": "/x.toml",
					"config_hash": "abc", "config_reload_count": uint64(0),
				},
				"revision": "rs",
			})
		default:
			http.NotFound(w, r)
		}
	}))
	defer up.Close()

	cfg := &config.Config{
		Servers: []config.Server{
			{Alias: "test", BaseURL: up.URL, PathPrefix: "/v1"},
		},
	}
	if err := cfg.Validate(); err != nil {
		t.Fatal(err)
	}
	parsed, err := cfg.Parse()
	if err != nil {
		t.Fatal(err)
	}
	h := NewHandler(parsed, up.Client(), nil, 0)
	req := httptest.NewRequest(http.MethodGet, "/api/agg/fleet-status?aliases=test", nil)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("status %d body %s", rec.Code, rec.Body.String())
	}
	var env struct {
		OK          bool            `json:"ok"`
		Data        FleetStatusData `json:"data"`
		GeneratedAt string          `json:"generated_at"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &env); err != nil {
		t.Fatal(err)
	}
	if !env.OK || env.GeneratedAt == "" || len(env.Data.Servers) != 1 {
		t.Fatalf("envelope: %+v", env)
	}
	s := env.Data.Servers[0]
	if s.Alias != "test" || !s.OK || s.Health == nil || s.SystemInfo == nil {
		t.Fatalf("server row: %+v", s)
	}
}

func TestHandlerRadarTelemtDcs(t *testing.T) {
	up := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/v1/stats/dcs" {
			http.NotFound(w, r)
			return
		}
		_ = json.NewEncoder(w).Encode(map[string]any{
			"ok": true,
			"data": map[string]any{
				"middle_proxy_enabled":     true,
				"generated_at_epoch_secs":  1,
				"dcs": []map[string]any{{
					"dc": 1, "rtt_ms": 42.5, "coverage_pct": 100.0,
					"alive_writers": 3, "required_writers": 3, "load": 0,
				}},
			},
			"revision": "rd",
		})
	}))
	defer up.Close()

	cfg := &config.Config{
		Servers: []config.Server{
			{Alias: "test", BaseURL: up.URL, PathPrefix: "/v1"},
		},
	}
	if err := cfg.Validate(); err != nil {
		t.Fatal(err)
	}
	parsed, err := cfg.Parse()
	if err != nil {
		t.Fatal(err)
	}
	h := NewHandler(parsed, up.Client(), nil, 0)
	req := httptest.NewRequest(http.MethodGet, "/api/agg/radar-telemt-dcs?aliases=test", nil)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("status %d body %s", rec.Code, rec.Body.String())
	}
	var env struct {
		OK   bool             `json:"ok"`
		Data RadarTelemtDcsData `json:"data"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &env); err != nil {
		t.Fatal(err)
	}
	if !env.OK || len(env.Data.Servers) != 1 {
		t.Fatalf("envelope: %+v", env)
	}
	row := env.Data.Servers[0]
	if row.Alias != "test" || !row.OK || row.Data == nil || !row.Data.MiddleProxyEnabled {
		t.Fatalf("row: %+v", row)
	}
	if len(row.Data.Dcs) != 1 || row.Data.Dcs[0].DC != 1 {
		t.Fatalf("dcs: %+v", row.Data.Dcs)
	}
}

func TestHandlerUserOne(t *testing.T) {
	up := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/v1/stats/users" {
			http.NotFound(w, r)
			return
		}
		_ = json.NewEncoder(w).Encode(map[string]any{
			"ok": true,
			"data": []map[string]any{{
				"username": "u1", "total_octets": 1048576, "current_connections": 2,
				"active_unique_ips": 1, "recent_unique_ips": 1,
				"max_tcp_conns":       10,
				"data_quota_bytes":    1000,
			}},
			"revision": "abc",
		})
	}))
	defer up.Close()

	cfg := &config.Config{
		Servers: []config.Server{
			{Alias: "test", BaseURL: up.URL, PathPrefix: "/v1"},
		},
	}
	if err := cfg.Validate(); err != nil {
		t.Fatal(err)
	}
	parsed, err := cfg.Parse()
	if err != nil {
		t.Fatal(err)
	}
	h := NewHandler(parsed, up.Client(), nil, 0)
	req := httptest.NewRequest(http.MethodGet, "/api/agg/user/u1?aliases=test", nil)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("status %d body %s", rec.Code, rec.Body.String())
	}
	var env struct {
		OK   bool    `json:"ok"`
		Data UsersRow `json:"data"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &env); err != nil {
		t.Fatal(err)
	}
	if env.Data.Username != "u1" || env.Data.MaxTCPConns == nil || *env.Data.MaxTCPConns != 10 {
		t.Fatalf("row: %+v", env.Data)
	}
}

func TestHandlerUserOneInvalidName(t *testing.T) {
	cfg := &config.Config{
		Servers: []config.Server{{Alias: "x", BaseURL: "http://127.0.0.1:1", PathPrefix: "/v1"}},
	}
	if err := cfg.Validate(); err != nil {
		t.Fatal(err)
	}
	parsed, err := cfg.Parse()
	if err != nil {
		t.Fatal(err)
	}
	h := NewHandler(parsed, http.DefaultClient, nil, 0)
	req := httptest.NewRequest(http.MethodGet, "/api/agg/user/!!!", nil)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("got %d", rec.Code)
	}
}

func TestHandlerMethodNotAllowed(t *testing.T) {
	cfg := &config.Config{
		Servers: []config.Server{{Alias: "x", BaseURL: "http://127.0.0.1:1", PathPrefix: "/v1"}},
	}
	if err := cfg.Validate(); err != nil {
		t.Fatal(err)
	}
	parsed, err := cfg.Parse()
	if err != nil {
		t.Fatal(err)
	}
	h := NewHandler(parsed, http.DefaultClient, nil, 0)
	req := httptest.NewRequest(http.MethodPost, "/api/agg/summary", nil)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusMethodNotAllowed {
		t.Fatalf("got %d", rec.Code)
	}
}