package server

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

	"github.com/dhao2001/mygo/internal/app"
	"github.com/dhao2001/mygo/internal/auth"
	"github.com/dhao2001/mygo/internal/config"
	"github.com/dhao2001/mygo/internal/repository"
	"github.com/dhao2001/mygo/internal/service"
)

func TestVersionRoute(t *testing.T) {
	cfg := &config.Config{
		JWT: config.JWTConfig{
			Secret:     "test-secret",
			AccessTTL:  15 * time.Minute,
			RefreshTTL: 168 * time.Hour,
		},
	}
	authService := service.NewAuthService(nil, nil, nil, nil, 15*time.Minute, 7*24*time.Hour)
	webApp := app.NewWebApp(cfg, nil, nil, nil, nil, nil, authService, nil, nil, nil)
	router := NewRouter(webApp)

	req := httptest.NewRequest(http.MethodGet, "/api/v1/version", nil)
	rec := httptest.NewRecorder()

	router.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
	}

	if got := rec.Header().Get("Content-Type"); got != "application/json; charset=utf-8" {
		t.Fatalf("content-type = %q, want %q", got, "application/json; charset=utf-8")
	}

	var body struct {
		Version string `json:"version"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
		t.Fatalf("unmarshal response: %v", err)
	}

	if body.Version != app.AppVersion {
		t.Errorf("version = %q, want %q", body.Version, app.AppVersion)
	}
}

func TestAddress(t *testing.T) {
	got := Address(config.ServerConfig{Host: "127.0.0.1", Port: 8080})
	want := "127.0.0.1:8080"
	if got != want {
		t.Errorf("Address() = %q, want %q", got, want)
	}
}

func TestAdminRoutes(t *testing.T) {
	// Setup SQLite :memory:
	dbCfg := config.DatabaseConfig{
		Driver: "sqlite3",
		SQLite: config.SQLiteConfig{Path: ":memory:"},
	}
	db, err := repository.Open(dbCfg)
	if err != nil {
		t.Fatalf("open db: %v", err)
	}
	if err := repository.AutoMigrate(db); err != nil {
		t.Fatalf("migrate: %v", err)
	}

	userRepo := repository.NewUserRepository(db)
	sessionRepo := repository.NewSessionRepository(db)
	credentialRepo := repository.NewCredentialRepository(db)

	jwtSecret := []byte("test-secret")
	accessTTL := 15 * time.Minute
	refreshTTL := 168 * time.Hour

	authService := service.NewAuthService(userRepo, sessionRepo, credentialRepo, jwtSecret, accessTTL, refreshTTL)
	adminService := service.NewAdminService(userRepo)

	cfg := &config.Config{
		JWT: config.JWTConfig{
			Secret:     "test-secret",
			AccessTTL:  accessTTL,
			RefreshTTL: refreshTTL,
		},
	}

	webApp := app.NewWebApp(cfg, db, userRepo, sessionRepo, nil, credentialRepo, authService, adminService, nil, nil)
	router := NewRouter(webApp)

	// Helper: register a user via POST /api/v1/auth/register and return the user ID.
	register := func(username, email, password string) string {
		body, _ := json.Marshal(map[string]string{
			"username": username,
			"email":    email,
			"password": password,
		})
		req := httptest.NewRequest(http.MethodPost, "/api/v1/auth/register", bytes.NewReader(body))
		req.Header.Set("Content-Type", "application/json")
		rec := httptest.NewRecorder()
		router.ServeHTTP(rec, req)

		if rec.Code != http.StatusCreated {
			t.Fatalf("register %s: status=%d, body=%s", username, rec.Code, rec.Body.String())
		}
		var user struct {
			ID string `json:"id"`
		}
		if err := json.Unmarshal(rec.Body.Bytes(), &user); err != nil {
			t.Fatalf("unmarshal register response: %v", err)
		}
		return user.ID
	}

	// Register admin user and promote to admin.
	adminID := register("admin", "admin@test.local", "adminpass1")
	adminUser, err := userRepo.FindByID(context.Background(), adminID)
	if err != nil {
		t.Fatalf("find admin user: %v", err)
	}
	adminUser.IsAdmin = true
	if err := userRepo.Update(context.Background(), adminUser); err != nil {
		t.Fatalf("promote to admin: %v", err)
	}

	// Generate admin JWT.
	adminToken, err := auth.GenerateAccessToken(adminID, jwtSecret, accessTTL)
	if err != nil {
		t.Fatalf("generate admin token: %v", err)
	}

	// Register a regular (non-admin) user.
	regularID := register("regular", "regular@test.local", "regularpass1")
	regularToken, err := auth.GenerateAccessToken(regularID, jwtSecret, accessTTL)
	if err != nil {
		t.Fatalf("generate regular token: %v", err)
	}

	// Register a victim user to delete.
	victimID := register("victim", "victim@test.local", "victimpass1")

	// Helper: make a DELETE request with optional auth header.
	deleteUser := func(userID, token string) *httptest.ResponseRecorder {
		url := "/api/v1/admin/users/" + userID
		req := httptest.NewRequest(http.MethodDelete, url, nil)
		if token != "" {
			req.Header.Set("Authorization", "Bearer "+token)
		}
		rec := httptest.NewRecorder()
		router.ServeHTTP(rec, req)
		return rec
	}

	// Test 1: Admin can delete a user → 204.
	rec := deleteUser(victimID, adminToken)
	if rec.Code != http.StatusNoContent {
		t.Errorf("admin delete: status=%d, want %d, body=%s", rec.Code, http.StatusNoContent, rec.Body.String())
	}

	// Register a second victim for the remaining tests (first victim is soft-deleted).
	victim2ID := register("victim2", "victim2@test.local", "victim2pass1")

	// Test 2: Non-admin JWT → 403.
	rec = deleteUser(victim2ID, regularToken)
	if rec.Code != http.StatusForbidden {
		t.Errorf("non-admin delete: status=%d, want %d, body=%s", rec.Code, http.StatusForbidden, rec.Body.String())
	}

	// Test 3: No auth → 401.
	rec = deleteUser(victim2ID, "")
	if rec.Code != http.StatusUnauthorized {
		t.Errorf("no-auth delete: status=%d, want %d, body=%s", rec.Code, http.StatusUnauthorized, rec.Body.String())
	}
}