package apiv1

import (
	"net/http"
	"net/http/httptest"
	"strings"

	"github.com/getkin/kin-openapi/openapi3"
	"github.com/go-chi/chi/v5"
	"github.com/navidrome/navidrome/api"
	"github.com/navidrome/navidrome/tests"
	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
)

var _ = Describe("Router", func() {
	var router *Router

	BeforeEach(func() {
		router = New(&tests.MockDataStore{})
	})

	It("routes every operation in the embedded spec", func() {
		doc, err := openapi3.NewLoader().LoadFromData(api.SpecJSON())
		Expect(err).ToNot(HaveOccurred())
		mux := New(&tests.MockDataStore{}).Handler.(chi.Routes)
		for path, item := range doc.Paths.Map() {
			for method := range item.Operations() {
				Expect(mux.Find(chi.NewRouteContext(), method, path)).To(Equal(path), method+" "+path)
			}
		}
	})

	It("declares Cache-Control no-store on the success responses of every no-store operation", func() {
		doc, err := openapi3.NewLoader().LoadFromData(api.SpecJSON())
		Expect(err).ToNot(HaveOccurred())
		checked := map[string]bool{}
		for _, item := range doc.Paths.Map() {
			for _, op := range item.Operations() {
				if !gateRulesV1.noStore[op.OperationID] {
					continue
				}
				for code, resp := range op.Responses.Map() {
					if !strings.HasPrefix(code, "2") {
						continue
					}
					h := resp.Value.Headers["Cache-Control"]
					Expect(h).ToNot(BeNil(), op.OperationID+" "+code)
					Expect(h.Value.Schema.Value.Enum).To(ConsistOf("no-store"), op.OperationID+" "+code)
					checked[op.OperationID] = true
				}
			}
		}
		Expect(checked).To(HaveLen(len(gateRulesV1.noStore)))
	})

	It("returns a 404 problem for unknown paths", func() {
		w := serve(router, httptest.NewRequest(http.MethodGet, "/api/v1/nope", nil))
		Expect(w.Code).To(Equal(http.StatusNotFound))
		Expect(w.Header().Get("Content-Type")).To(Equal(problemContentType))
		Expect(decodeProblem(w).Code).To(Equal(ProblemCodeNotFound))
	})

	It("returns a 405 problem listing the allowed methods for a wrong method on a known path", func() {
		w := serve(router, httptest.NewRequest(http.MethodPost, "/api/v1/server", nil))
		Expect(w.Code).To(Equal(http.StatusMethodNotAllowed))
		Expect(w.Header().Get("Allow")).To(Equal("GET, HEAD"))
		Expect(decodeProblem(w).Code).To(Equal(ProblemCodeMethodNotAllowed))
	})

	DescribeTable("answers HEAD wherever GET is routed",
		func(path, contentType string) {
			w := serve(router, httptest.NewRequest(http.MethodHead, path, nil))
			Expect(w.Code).To(Equal(http.StatusOK))
			Expect(w.Header().Get("Content-Type")).To(Equal(contentType))
		},
		Entry("server info", "/api/v1/server", "application/json"),
		Entry("JSON spec", "/api/v1/openapi.json", "application/json"),
		Entry("YAML spec", "/api/v1/openapi.yaml", "application/yaml"),
	)

	It("revalidates HEAD requests with If-None-Match", func() {
		etag := serve(router, httptest.NewRequest(http.MethodHead, "/api/v1/openapi.json", nil)).Header().Get("ETag")
		req := httptest.NewRequest(http.MethodHead, "/api/v1/openapi.json", nil)
		req.Header.Set("If-None-Match", etag)
		Expect(serve(router, req).Code).To(Equal(http.StatusNotModified))
	})

	It("returns a 404 problem for HEAD on unknown paths", func() {
		w := serve(router, httptest.NewRequest(http.MethodHead, "/api/v1/nope", nil))
		Expect(w.Code).To(Equal(http.StatusNotFound))
		Expect(w.Header().Get("Allow")).To(BeEmpty())
	})

	panicking := func(v any) http.Handler {
		return problemRecoverer(http.HandlerFunc(func(http.ResponseWriter, *http.Request) { panic(v) }))
	}

	It("turns a handler panic into a 500 problem", func() {
		w := httptest.NewRecorder()
		panicking("kaboom").ServeHTTP(w, httptest.NewRequest(http.MethodGet, "/boom", nil))
		Expect(w.Code).To(Equal(http.StatusInternalServerError))
		p := decodeProblem(w)
		Expect(p.Code).To(Equal(ProblemCodeInternal))
		Expect(p.Detail).To(BeNil())
	})

	It("tags internal errors with a referenceId that is also on the request's log lines", func() {
		logs := captureLogs()
		w := httptest.NewRecorder()
		h := referenceIDMiddleware(problemRecoverer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			panic("kaboom")
		})))
		h.ServeHTTP(w, httptest.NewRequestWithContext(GinkgoT().Context(), http.MethodGet, "/boom", nil))
		p := decodeProblem(w)
		Expect(p.ReferenceId).ToNot(BeNil())
		Expect(*p.ReferenceId).To(MatchRegexp(`^[0-9A-Za-z]{22}$`))
		Expect(logs.String()).To(ContainSubstring(*p.ReferenceId))
	})

	It("re-panics http.ErrAbortHandler so the server can drop the connection", func() {
		Expect(func() {
			panicking(http.ErrAbortHandler).ServeHTTP(httptest.NewRecorder(), httptest.NewRequest(http.MethodGet, "/abort", nil))
		}).To(PanicWith(http.ErrAbortHandler))
	})
})