package chaos

import (
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func TestClientCreateLatencyAndReset(t *testing.T) {
	t.Parallel()

	toxics := map[string][]Toxic{}

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch {
		case r.Method == http.MethodPost && r.URL.Path == "/proxies":
			var p Proxy
			if err := json.NewDecoder(r.Body).Decode(&p); err != nil {
				t.Errorf("decode proxy: %v", err)
				http.Error(w, err.Error(), 400)
				return
			}
			if p.Listen == "0.0.0.0:0" {
				p.Listen = "0.0.0.0:18080"
			}
			w.Header().Set("Content-Type", "application/json")
			_ = json.NewEncoder(w).Encode(p)

		case r.Method == http.MethodPost && strings.HasSuffix(r.URL.Path, "/toxics"):
			var toxic Toxic
			if err := json.NewDecoder(r.Body).Decode(&toxic); err != nil {
				http.Error(w, err.Error(), 400)
				return
			}
			name := strings.TrimSuffix(strings.TrimPrefix(r.URL.Path, "/proxies/"), "/toxics")
			toxics[name] = append(toxics[name], toxic)
			w.Header().Set("Content-Type", "application/json")
			_ = json.NewEncoder(w).Encode(toxic)

		case r.Method == http.MethodDelete:
			w.WriteHeader(http.StatusNoContent)

		default:
			http.NotFound(w, r)
		}
	}))
	t.Cleanup(srv.Close)

	c := NewClient(srv.URL)
	p, err := c.CreateProxy("q-demo", "0.0.0.0:0", "127.0.0.1:19000")
	if err != nil {
		t.Fatalf("CreateProxy: %v", err)
	}
	if p.Upstream != "127.0.0.1:19000" {
		t.Fatalf("upstream = %q", p.Upstream)
	}
	if p.Listen != "0.0.0.0:18080" {
		t.Fatalf("listen = %q", p.Listen)
	}

	lat, err := c.AddLatency("q-demo", "lag", 200, 50, "")
	if err != nil {
		t.Fatalf("AddLatency: %v", err)
	}
	if lat.Type != "latency" {
		t.Fatalf("type = %q", lat.Type)
	}
	if _, err := c.AddResetPeer("q-demo", "drop", 0, ""); err != nil {
		t.Fatalf("AddResetPeer: %v", err)
	}
	if got := toxics["q-demo"]; len(got) != 2 {
		t.Fatalf("toxics len = %d", len(got))
	}
	if got := toxics["q-demo"][0]; got.Type != "latency" {
		t.Fatalf("first toxic type = %q", got.Type)
	}
	if err := c.RemoveToxic("q-demo", "lag"); err != nil {
		t.Fatalf("RemoveToxic: %v", err)
	}
	if err := c.DeleteProxy("q-demo"); err != nil {
		t.Fatalf("DeleteProxy: %v", err)
	}
}

func TestClientRejectsEmptyFields(t *testing.T) {
	t.Parallel()
	c := NewClient("http://127.0.0.1:1")
	if _, err := c.CreateProxy("", "0.0.0.0:0", "127.0.0.1:1"); err == nil {
		t.Fatal("expected error for empty name")
	}
	if _, err := c.CreateProxy("x", "", "127.0.0.1:1"); err == nil {
		t.Fatal("expected error for empty listen")
	}
	if _, err := c.CreateProxy("x", "0.0.0.0:0", ""); err == nil {
		t.Fatal("expected error for empty upstream")
	}
}

func TestCreateProxyErrorStatus(t *testing.T) {
	t.Parallel()
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.WriteHeader(http.StatusConflict)
		_, _ = io.WriteString(w, "already exists")
	}))
	t.Cleanup(srv.Close)
	c := NewClient(srv.URL)
	if _, err := c.CreateProxy("q", "0.0.0.0:0", "127.0.0.1:9"); err == nil {
		t.Fatal("expected error")
	}
}