package api

import (
	"context"
	"encoding/json"
	"errors"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	hub "git.ipao.vip/rogee/creator-hub/internal/environment"
)

func TestStartUnknownPreservesGatewayFailureReason(t *testing.T) {
	for _, disconnected := range []bool{false, true} {
		t.Run(map[bool]string{false: "server failure", true: "connection lost"}[disconnected], func(t *testing.T) {
			created := false
			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				if r.Method == http.MethodPost {
					created = true
					if disconnected {
						connection, _, err := w.(http.Hijacker).Hijack()
						if err != nil {
							t.Error(err)
							return
						}
						_ = connection.Close()
						return
					}
					w.WriteHeader(http.StatusServiceUnavailable)
					_, _ = w.Write([]byte(`{"error":"no free Xvfb display is available"}`))
					return
				}
				if created {
					w.WriteHeader(http.StatusServiceUnavailable)
					_, _ = w.Write([]byte(`{"error":"cannot reconcile runtime"}`))
					return
				}
				_, _ = w.Write([]byte(`[]`))
			}))
			defer server.Close()
			store := newMemoryStore()
			store.gateways["gw-1"] = hub.Gateway{Name: "gw-1", Endpoint: server.URL}
			environment := hub.EnvironmentContext{Env: hub.Env{Alias: "account-a", Gateway: "gw-1", Fingerprint: hub.Fingerprint{Seed: 1}}, AccountID: "account-a", AccountStatus: "active", BindingVersion: 1}
			store.bindings[environment.Alias] = environment
			finish := func(outcome, reason string, _ hub.EnvironmentContext) error {
				if outcome != "unknown" || reason != "gateway_result_unknown" {
					t.Errorf("unexpected result: %s/%s", outcome, reason)
				}
				return nil
			}
			err := startBrowserRuntime(context.Background(), store, nil, environment, finish)
			want := "no free Xvfb display is available"
			if disconnected {
				want = "EOF"
			}
			if err == nil || !strings.Contains(err.Error(), want) {
				t.Fatalf("original startup cause was hidden: %v", err)
			}
		})
	}
}

func TestStartBrowserRuntimeSuccessfulAndFailedCompletion(t *testing.T) {
	for _, existing := range []bool{false, true} {
		for _, finishFails := range []bool{false, true} {
			t.Run(map[bool]string{false: "create", true: "reconcile"}[existing]+map[bool]string{false: " success", true: " finish error"}[finishFails], func(t *testing.T) {
				posts := 0
				runtime := runtimeStatus{ID: "runtime-a", Alias: "account-a", State: "running", NetworkID: "net-a", BindingVersion: 1, ProxyReady: true}
				server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
					if r.Method == http.MethodPost {
						posts++
						w.WriteHeader(http.StatusCreated)
						_ = json.NewEncoder(w).Encode(runtime)
					} else if existing {
						_ = json.NewEncoder(w).Encode([]runtimeStatus{runtime})
					} else {
						_, _ = w.Write([]byte(`[]`))
					}
				}))
				defer server.Close()
				store := newMemoryStore()
				store.gateways["gw-1"] = hub.Gateway{Name: "gw-1", Endpoint: server.URL}
				environment := hub.EnvironmentContext{Env: hub.Env{Alias: "account-a", Gateway: "gw-1", Fingerprint: hub.Fingerprint{Seed: 1}}, AccountID: "account-a", AccountStatus: "active", BindingVersion: 1}
				store.bindings[environment.Alias] = environment
				finishErr := errors.New("completion recording failed")
				finish := func(outcome, reason string, current hub.EnvironmentContext) error {
					want := "environment_started"
					if existing {
						want = "gateway_reconciled"
					}
					if outcome != "succeeded" || reason != want || current.RuntimeID != runtime.ID {
						t.Errorf("unexpected completion: %s/%s/%s", outcome, reason, current.RuntimeID)
					}
					if finishFails {
						return finishErr
					}
					return nil
				}
				err := startBrowserRuntime(context.Background(), store, nil, environment, finish)
				if finishFails && !errors.Is(err, finishErr) || !finishFails && err != nil {
					t.Fatalf("unexpected start result: %v", err)
				}
				if existing && posts != 0 || !existing && posts != 1 {
					t.Fatalf("unexpected create count: %d", posts)
				}
			})
		}
	}
}

func TestGatewayRejectedPreservesServerFailureReason(t *testing.T) {
	err := gatewayRejected(http.StatusServiceUnavailable, []byte(`{"error":"no free Xvfb display is available"}`))
	if !strings.Contains(err.Error(), "no free Xvfb display is available") {
		t.Fatalf("gateway failure hid its cause: %v", err)
	}
}