/*
이 테스트 파일은 HydraAdminService의 기능을 검증하기 위한 유닛 테스트입니다.
Hydra Admin API와의 통신을 시뮬레이션하기 위해 httptest 패키지를 사용하여
실제 네트워크 호출 없이 HTTP 핸들러를 모킹(Mocking)하는 방식으로 작성되었습니다.

주요 테스트 항목:
1. 클라이언트 관리: List, Get, Create, Update, Patch, Delete (성공 및 NotFound 케이스)
2. OIDC 인증/동의 흐름: GetConsentRequest, AcceptConsentRequest, RejectConsentRequest, GetLoginRequest, AcceptLoginRequest, RejectLoginRequest
3. 세션 관리: ListConsentSessions, RevokeConsentSessions
4. 존재하지 않는 리소스 접근 시 에러 처리
*/

package service

import (
	"baron-sso-backend/internal/domain"
	"bytes"
	"context"
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

// clientForHandler는 주어진 핸들러로 요청을 보내는 http.Client를 반환합니다.
// ory_service_test.go에 정의된 것과 동일한 로직입니다.
func mockHydraClient(h http.Handler) *http.Client {
	return &http.Client{
		Transport: roundTripperFunc(func(req *http.Request) (*http.Response, error) {
			var bodyBytes []byte
			if req.Body != nil {
				bodyBytes, _ = io.ReadAll(req.Body)
			}
			r := httptest.NewRequest(req.Method, req.URL.String(), bytes.NewReader(bodyBytes))
			r.Header = req.Header.Clone()

			w := httptest.NewRecorder()
			h.ServeHTTP(w, r)
			return w.Result(), nil
		}),
	}
}

func TestHydraAdminService_ListClients(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodGet || !strings.Contains(r.URL.Path, "/clients") {
			t.Errorf("unexpected request: %s %s", r.Method, r.URL.String())
			return
		}

		clients := []domain.HydraClient{
			{ClientID: "client-1", ClientName: "Client One"},
			{ClientID: "client-2", ClientName: "Client Two"},
		}
		json.NewEncoder(w).Encode(clients)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	clients, err := svc.ListClients(context.Background(), 10, 0)
	if err != nil {
		t.Fatalf("ListClients failed: %v", err)
	}

	if len(clients) != 2 {
		t.Errorf("expected 2 clients, got %d", len(clients))
	}
}

func TestHydraAdminService_GetClient_Success(t *testing.T) {
	targetID := "test-client"
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		client := domain.HydraClient{
			ClientID:   targetID,
			ClientName: "Test Client",
		}
		json.NewEncoder(w).Encode(client)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	client, err := svc.GetClient(context.Background(), targetID)
	if err != nil {
		t.Fatalf("GetClient failed: %v", err)
	}

	if client.ClientID != targetID {
		t.Errorf("expected %s, got %s", targetID, client.ClientID)
	}
}

func TestHydraAdminService_GetClient_NotFound(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusNotFound)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	_, err := svc.GetClient(context.Background(), "non-existent")
	if err != ErrHydraNotFound {
		t.Errorf("expected ErrHydraNotFound, got %v", err)
	}
}

func TestHydraAdminService_PatchClientStatus(t *testing.T) {
	targetID := "test-client"
	status := "inactive"
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPatch {
			t.Errorf("expected PATCH, got %s", r.Method)
		}
		var patch []map[string]interface{}
		json.NewDecoder(r.Body).Decode(&patch)
		if patch[0]["value"] != status {
			t.Errorf("expected status %s, got %v", status, patch[0]["value"])
		}

		client := domain.HydraClient{ClientID: targetID}
		json.NewEncoder(w).Encode(client)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	_, err := svc.PatchClientStatus(context.Background(), targetID, status)
	if err != nil {
		t.Fatalf("PatchClientStatus failed: %v", err)
	}
}

func TestHydraAdminService_CreateClient(t *testing.T) {
	newClient := domain.HydraClient{ClientID: "new-client"}
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusCreated)
		json.NewEncoder(w).Encode(newClient)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	created, err := svc.CreateClient(context.Background(), newClient)
	if err != nil {
		t.Fatalf("CreateClient failed: %v", err)
	}
	if created.ClientID != newClient.ClientID {
		t.Errorf("expected %s, got %s", newClient.ClientID, created.ClientID)
	}
}

func TestHydraAdminService_UpdateClient(t *testing.T) {
	targetID := "test-client"
	updatedClient := domain.HydraClient{ClientID: targetID, ClientName: "Updated"}
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPut {
			t.Errorf("expected PUT, got %s", r.Method)
		}
		json.NewEncoder(w).Encode(updatedClient)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	res, err := svc.UpdateClient(context.Background(), targetID, updatedClient)
	if err != nil {
		t.Fatalf("UpdateClient failed: %v", err)
	}
	if res.ClientName != "Updated" {
		t.Errorf("expected Updated, got %s", res.ClientName)
	}
}

func TestHydraAdminService_DeleteClient(t *testing.T) {
	targetID := "test-client"
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodDelete {
			t.Errorf("expected DELETE, got %s", r.Method)
		}
		w.WriteHeader(http.StatusNoContent)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	err := svc.DeleteClient(context.Background(), targetID)
	if err != nil {
		t.Fatalf("DeleteClient failed: %v", err)
	}
}

func TestHydraAdminService_ListConsentSessions(t *testing.T) {
	subject := "user-123"
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Query().Get("subject") != subject {
			t.Errorf("expected subject %s, got %s", subject, r.URL.Query().Get("subject"))
		}
		sessions := []domain.HydraConsentSession{{Subject: subject}}
		json.NewEncoder(w).Encode(sessions)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	res, err := svc.ListConsentSessions(context.Background(), subject, "")
	if err != nil {
		t.Fatalf("ListConsentSessions failed: %v", err)
	}
	if len(res) != 1 {
		t.Errorf("expected 1 session, got %d", len(res))
	}
}

func TestHydraAdminService_RevokeConsentSessions(t *testing.T) {
	subject := "user-123"
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodDelete {
			t.Errorf("expected DELETE, got %s", r.Method)
		}
		w.WriteHeader(http.StatusNoContent)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	err := svc.RevokeConsentSessions(context.Background(), subject, "client-1")
	if err != nil {
		t.Fatalf("RevokeConsentSessions failed: %v", err)
	}
}

func TestHydraAdminService_GetConsentRequest(t *testing.T) {
	challenge := "consent-challenge"
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Query().Get("consent_challenge") != challenge {
			t.Errorf("expected challenge %s, got %s", challenge, r.URL.Query().Get("consent_challenge"))
		}
		resp := domain.HydraConsentRequest{Challenge: challenge}
		json.NewEncoder(w).Encode(resp)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	req, err := svc.GetConsentRequest(context.Background(), challenge)
	if err != nil {
		t.Fatalf("GetConsentRequest failed: %v", err)
	}
	if req.Challenge != challenge {
		t.Errorf("expected %s, got %s", challenge, req.Challenge)
	}
}

func TestHydraAdminService_RejectConsentRequest(t *testing.T) {
	challenge := "consent-challenge"
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPut {
			t.Errorf("expected PUT, got %s", r.Method)
		}
		resp := struct {
			RedirectTo string `json:"redirect_to"`
		}{
			RedirectTo: "http://redirect",
		}
		json.NewEncoder(w).Encode(resp)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	resp, err := svc.RejectConsentRequest(context.Background(), challenge)
	if err != nil {
		t.Fatalf("RejectConsentRequest failed: %v", err)
	}
	if resp.RedirectTo != "http://redirect" {
		t.Errorf("expected http://redirect, got %s", resp.RedirectTo)
	}
}

func TestHydraAdminService_RejectLoginRequest(t *testing.T) {
	challenge := "login-challenge"
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		resp := struct {
			RedirectTo string `json:"redirect_to"`
		}{
			RedirectTo: "http://redirect",
		}
		json.NewEncoder(w).Encode(resp)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	resp, err := svc.RejectLoginRequest(context.Background(), challenge, "error", "desc")
	if err != nil {
		t.Fatalf("RejectLoginRequest failed: %v", err)
	}
	if resp.RedirectTo != "http://redirect" {
		t.Errorf("expected http://redirect, got %s", resp.RedirectTo)
	}
}

func TestHydraAdminService_GetLoginRequest(t *testing.T) {
	challenge := "login-challenge"
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		resp := domain.HydraLoginRequest{Challenge: challenge}
		json.NewEncoder(w).Encode(resp)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	req, err := svc.GetLoginRequest(context.Background(), challenge)
	if err != nil {
		t.Fatalf("GetLoginRequest failed: %v", err)
	}
	if req.Challenge != challenge {
		t.Errorf("expected %s, got %s", challenge, req.Challenge)
	}
}

func TestHydraAdminService_AcceptConsentRequest(t *testing.T) {
	challenge := "consent-challenge"
	grantInfo := &domain.HydraConsentRequest{RequestedScope: []string{"openid"}}
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		resp := struct {
			RedirectTo string `json:"redirect_to"`
		}{
			RedirectTo: "http://callback",
		}
		json.NewEncoder(w).Encode(resp)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	resp, err := svc.AcceptConsentRequest(context.Background(), challenge, grantInfo, nil)
	if err != nil {
		t.Fatalf("AcceptConsentRequest failed: %v", err)
	}
	if resp.RedirectTo != "http://callback" {
		t.Errorf("expected http://callback, got %s", resp.RedirectTo)
	}
}

func TestHydraAdminService_AcceptLoginRequest(t *testing.T) {
	challenge := "login-challenge"
	subject := "user@example.com"
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		resp := struct {
			RedirectTo string `json:"redirect_to"`
		}{
			RedirectTo: "http://callback",
		}
		json.NewEncoder(w).Encode(resp)
	})

	svc := &HydraAdminService{
		AdminURL:   "http://hydra:4445",
		HTTPClient: mockHydraClient(handler),
	}

	resp, err := svc.AcceptLoginRequest(context.Background(), challenge, subject)
	if err != nil {
		t.Fatalf("AcceptLoginRequest failed: %v", err)
	}
	if resp.RedirectTo != "http://callback" {
		t.Errorf("expected http://callback, got %s", resp.RedirectTo)
	}
}