package client

import (
	"context"
	"encoding/json"
	"net"
	"net/http"
	"net/http/httptest"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"bugabinga.net/toad/internal/api"
	"bugabinga.net/toad/internal/store"
)

func TestAwaitPollsUntilTerminalPhase(t *testing.T) {
	phases := []store.Phase{store.PhaseActivating, store.PhaseProbation, store.PhasePromoted}
	var calls int
	server := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
		if request.Header.Get("Authorization") != "Bearer secret" {
			writer.WriteHeader(http.StatusUnauthorized)
			return
		}
		phase := phases[min(calls, len(phases)-1)]
		calls++
		_ = json.NewEncoder(writer).Encode(store.Operation{ID: "op-1", Service: "app", Phase: phase, Generation: 3})
	}))
	defer server.Close()

	remote := Client{Endpoint: server.URL, Token: "secret"}
	operation, err := remote.Await(context.Background(), "app", "op-1", time.Millisecond)
	if err != nil {
		t.Fatal(err)
	}
	if operation.Phase != store.PhasePromoted || calls != 3 {
		t.Fatalf("operation = %+v calls = %d", operation, calls)
	}
}

func TestDeploySendsPinnedRequestAndSurfacesConflict(t *testing.T) {
	var received api.DeployRequest
	server := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
		if err := json.NewDecoder(request.Body).Decode(&received); err != nil {
			t.Error(err)
		}
		writer.WriteHeader(http.StatusConflict)
		_ = json.NewEncoder(writer).Encode(map[string]any{"error": "conflict: expected generation 1, current generation 2"})
	}))
	defer server.Close()

	remote := Client{Endpoint: server.URL + "/", Token: "secret"}
	_, err := remote.Deploy(context.Background(), "app", api.DeployRequest{
		Digest:             "sha256:0000000000000000000000000000000000000000000000000000000000000000",
		ExpectedGeneration: 1,
		IdempotencyKey:     "key-1",
	})
	if err == nil || !strings.Contains(err.Error(), "current generation 2") {
		t.Fatalf("err = %v", err)
	}
	if received.ExpectedGeneration != 1 || received.IdempotencyKey != "key-1" {
		t.Fatalf("received = %+v", received)
	}
}

func TestUnixEndpointNeedsNoTokenHeader(t *testing.T) {
	socket := filepath.Join(t.TempDir(), "toad.sock")
	listener, err := net.Listen("unix", socket)
	if err != nil {
		t.Fatal(err)
	}
	var sawAuthorization bool
	server := &http.Server{Handler: http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
		sawAuthorization = request.Header.Get("Authorization") != ""
		_ = json.NewEncoder(writer).Encode(ServiceState{Service: "app", Generation: 4})
	})}
	go func() { _ = server.Serve(listener) }()
	t.Cleanup(func() { _ = server.Close() })

	remote := Client{Endpoint: "unix://" + socket}
	state, err := remote.Service(context.Background(), "app")
	if err != nil {
		t.Fatal(err)
	}
	if state.Generation != 4 || sawAuthorization {
		t.Fatalf("state = %+v authorization sent = %v", state, sawAuthorization)
	}
}

func TestUnauthorizedResponseIsReported(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, _ *http.Request) {
		writer.WriteHeader(http.StatusUnauthorized)
		_ = json.NewEncoder(writer).Encode(map[string]string{"error": "unauthorized"})
	}))
	defer server.Close()

	remote := Client{Endpoint: server.URL, Token: "wrong"}
	if _, err := remote.Service(context.Background(), "app"); err == nil || !strings.Contains(err.Error(), "unauthorized") {
		t.Fatalf("err = %v", err)
	}
}