package nativeapi

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

	"github.com/navidrome/navidrome/conf"
	"github.com/navidrome/navidrome/conf/configtest"
	"github.com/navidrome/navidrome/consts"
	"github.com/navidrome/navidrome/core/auth"
	"github.com/navidrome/navidrome/model"
	"github.com/navidrome/navidrome/server"
	"github.com/navidrome/navidrome/tests"
	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
)

var _ = Describe("Config API", func() {
	var ds model.DataStore
	var router http.Handler
	var adminUser, regularUser model.User

	BeforeEach(func() {
		DeferCleanup(configtest.SetupConfig())
		conf.Server.DevUIShowConfig = true // Enable config endpoint for tests
		ds = &tests.MockDataStore{}
		auth.Init(ds)
		nativeRouter := New(ds, nil, nil, nil, tests.NewMockLibraryService(), tests.NewMockUserService(), nil, nil, nil)
		router = server.JWTVerifier(nativeRouter)

		// Create test users
		adminUser = model.User{
			ID:          "admin-1",
			UserName:    "admin",
			Name:        "Admin User",
			IsAdmin:     true,
			NewPassword: "adminpass",
		}
		regularUser = model.User{
			ID:          "user-1",
			UserName:    "regular",
			Name:        "Regular User",
			IsAdmin:     false,
			NewPassword: "userpass",
		}

		// Store in mock datastore
		Expect(ds.User(context.TODO()).Put(&adminUser)).To(Succeed())
		Expect(ds.User(context.TODO()).Put(&regularUser)).To(Succeed())
	})

	Describe("GET /api/config", func() {
		Context("as admin user", func() {
			var adminToken string

			BeforeEach(func() {
				var err error
				adminToken, err = auth.CreateToken(&adminUser)
				Expect(err).ToNot(HaveOccurred())
			})

			It("returns config successfully", func() {
				req := createAuthenticatedConfigRequest(adminToken)
				w := httptest.NewRecorder()

				router.ServeHTTP(w, req)

				Expect(w.Code).To(Equal(http.StatusOK))
				var resp configResponse
				Expect(json.Unmarshal(w.Body.Bytes(), &resp)).To(Succeed())
				Expect(resp.ID).To(Equal("config"))
				Expect(resp.ConfigFile).To(Equal(conf.Server.ConfigFile))
				Expect(resp.Config).ToNot(BeEmpty())
			})

			It("redacts sensitive fields", func() {
				conf.Server.LastFM.ApiKey = "secretapikey123"
				conf.Server.PasswordEncryptionKey = "encryptionkey789"
				conf.Server.DevAutoCreateAdminPassword = "adminpassword123"
				conf.Server.Prometheus.Password = "prometheuspass"

				req := createAuthenticatedConfigRequest(adminToken)
				w := httptest.NewRecorder()

				router.ServeHTTP(w, req)

				Expect(w.Code).To(Equal(http.StatusOK))
				var resp configResponse
				Expect(json.Unmarshal(w.Body.Bytes(), &resp)).To(Succeed())

				// Check LastFM.ApiKey (partially masked)
				lastfm, ok := resp.Config["LastFM"].(map[string]any)
				Expect(ok).To(BeTrue())
				Expect(lastfm["ApiKey"]).To(Equal("s*************3"))

				// Check PasswordEncryptionKey (fully masked)
				Expect(resp.Config["PasswordEncryptionKey"]).To(Equal("****"))

				// Check DevAutoCreateAdminPassword (fully masked)
				Expect(resp.Config["DevAutoCreateAdminPassword"]).To(Equal("****"))

				// Check Prometheus.Password (fully masked)
				prometheus, ok := resp.Config["Prometheus"].(map[string]any)
				Expect(ok).To(BeTrue())
				Expect(prometheus["Password"]).To(Equal("****"))
			})

			It("handles empty sensitive values", func() {
				conf.Server.LastFM.ApiKey = ""
				conf.Server.PasswordEncryptionKey = ""

				req := createAuthenticatedConfigRequest(adminToken)
				w := httptest.NewRecorder()

				router.ServeHTTP(w, req)

				Expect(w.Code).To(Equal(http.StatusOK))
				var resp configResponse
				Expect(json.Unmarshal(w.Body.Bytes(), &resp)).To(Succeed())

				// Check LastFM.ApiKey - should be preserved because it's sensitive
				lastfm, ok := resp.Config["LastFM"].(map[string]any)
				Expect(ok).To(BeTrue())
				Expect(lastfm["ApiKey"]).To(Equal(""))

				// Empty sensitive values should remain empty - should be preserved because it's sensitive
				Expect(resp.Config["PasswordEncryptionKey"]).To(Equal(""))
			})
		})

		Context("as regular user", func() {
			var userToken string

			BeforeEach(func() {
				var err error
				userToken, err = auth.CreateToken(&regularUser)
				Expect(err).ToNot(HaveOccurred())
			})

			It("denies access with forbidden status", func() {
				req := createAuthenticatedConfigRequest(userToken)
				w := httptest.NewRecorder()

				router.ServeHTTP(w, req)

				Expect(w.Code).To(Equal(http.StatusForbidden))
			})
		})

		Context("without authentication", func() {
			It("denies access with unauthorized status", func() {
				req := createUnauthenticatedConfigRequest("GET", "/config/", nil)
				w := httptest.NewRecorder()

				router.ServeHTTP(w, req)

				Expect(w.Code).To(Equal(http.StatusUnauthorized))
			})
		})
	})
})

var _ = Describe("redactValue function", func() {
	It("partially masks long sensitive values", func() {
		Expect(redactValue("LastFM.ApiKey", "ba46f0e84a")).To(Equal("b********a"))
	})

	It("fully masks long sensitive values that should be completely hidden", func() {
		Expect(redactValue("PasswordEncryptionKey", "1234567890")).To(Equal("****"))
		Expect(redactValue("DevAutoCreateAdminPassword", "1234567890")).To(Equal("****"))
		Expect(redactValue("Prometheus.Password", "1234567890")).To(Equal("****"))
	})

	It("fully masks short sensitive values", func() {
		Expect(redactValue("LastFM.Secret", "short")).To(Equal("****"))
		Expect(redactValue("PasswordEncryptionKey", "12345")).To(Equal("****"))
		Expect(redactValue("DevAutoCreateAdminPassword", "short")).To(Equal("****"))
		Expect(redactValue("Prometheus.Password", "short")).To(Equal("****"))
	})

	It("does not mask non-sensitive values", func() {
		Expect(redactValue("MusicFolder", "/path/to/music")).To(Equal("/path/to/music"))
		Expect(redactValue("Port", "4533")).To(Equal("4533"))
		Expect(redactValue("SomeOtherField", "secretvalue")).To(Equal("secretvalue"))
	})

	It("handles empty values", func() {
		Expect(redactValue("LastFM.ApiKey", "")).To(Equal(""))
		Expect(redactValue("NonSensitive", "")).To(Equal(""))
	})

	It("handles edge case values", func() {
		Expect(redactValue("LastFM.ApiKey", "a")).To(Equal("****"))
		Expect(redactValue("LastFM.ApiKey", "ab")).To(Equal("****"))
		Expect(redactValue("LastFM.ApiKey", "abcdefg")).To(Equal("a*****g"))
	})
})

// Helper functions

func createAuthenticatedConfigRequest(token string) *http.Request {
	req := httptest.NewRequest(http.MethodGet, "/config/config", nil)
	req.Header.Set(consts.UIAuthorizationHeader, "Bearer "+token)
	req.Header.Set("Content-Type", "application/json")
	return req
}

func createUnauthenticatedConfigRequest(method, path string, body *bytes.Buffer) *http.Request {
	if body == nil {
		body = &bytes.Buffer{}
	}
	req := httptest.NewRequest(method, path, body)
	req.Header.Set("Content-Type", "application/json")
	return req
}
