package arrayapi

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

	"github.com/itworx/pulse/internal/array"
	"github.com/itworx/pulse/internal/auth"
)

type provider struct{ snapshot array.Snapshot }

func (p provider) Snapshot(context.Context) (array.Snapshot, error) { return p.snapshot, nil }
func authenticatedRequest(method, path string) *http.Request {
	request := httptest.NewRequest(method, path, nil)
	return request.WithContext(auth.WithPrincipal(request.Context(), auth.Principal{Subject: "viewer", Role: auth.RoleViewer}))
}

func TestHandlerRequiresAuthenticationAndReturnsUnknown(t *testing.T) {
	unauthenticated := httptest.NewRecorder()
	Handler{}.ServeHTTP(unauthenticated, httptest.NewRequest(http.MethodGet, "/api/v1/array", nil))
	if unauthenticated.Code != http.StatusUnauthorized {
		t.Fatalf("status=%d", unauthenticated.Code)
	}
	response := httptest.NewRecorder()
	Handler{}.ServeHTTP(response, authenticatedRequest(http.MethodGet, "/api/v1/array"))
	if response.Code != http.StatusOK || !strings.Contains(response.Body.String(), `"state":"unknown"`) {
		t.Fatalf("status=%d body=%s", response.Code, response.Body.String())
	}
}
func TestHandlerReturnsSnapshotAndRejectsMutations(t *testing.T) {
	snapshot := array.UnknownSnapshot(time.Date(2026, 8, 1, 12, 0, 0, 0, time.UTC), "fixture-array", "fixture", "test")
	response := httptest.NewRecorder()
	Handler{Provider: provider{snapshot: snapshot}}.ServeHTTP(response, authenticatedRequest(http.MethodGet, "/api/v1/array"))
	if response.Code != http.StatusOK || !strings.Contains(response.Body.String(), `"id":"fixture-array"`) {
		t.Fatalf("status=%d body=%s", response.Code, response.Body.String())
	}
	mutation := httptest.NewRecorder()
	Handler{}.ServeHTTP(mutation, authenticatedRequest(http.MethodPost, "/api/v1/array/check"))
	if mutation.Code != http.StatusNotFound {
		t.Fatalf("status=%d", mutation.Code)
	}
}

func TestHandlerEncodesEmptyCollectionsAsArrays(t *testing.T) {
	response := httptest.NewRecorder()
	Handler{Provider: provider{snapshot: array.Snapshot{}}}.ServeHTTP(response, authenticatedRequest(http.MethodGet, "/api/v1/array"))
	var body struct {
		Members []array.Member `json:"members"`
		History []array.Check  `json:"history"`
	}
	if err := json.Unmarshal(response.Body.Bytes(), &body); err != nil {
		t.Fatal(err)
	}
	if body.Members == nil || body.History == nil {
		t.Fatalf("empty collections must be JSON arrays: %s", response.Body.String())
	}
}