package tide

import (
	"context"
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

const testJWT = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJhbGljZSJ9.signaturehere123456"

func TestCaptureAndPlaceholderResolution(t *testing.T) {
	store, err := OpenStore("")
	if err != nil {
		t.Fatal(err)
	}
	step := Step{
		ID: "login",
		Response: Response{
			Headers: map[string]string{"Content-Type": "application/json"},
			Body:    Body(`{"token":"` + testJWT + `"}`),
		},
		Capture: []CaptureRule{{
			From:     "response.json",
			Path:     "$.token",
			As:       "jwt:alice",
			Identity: "alice",
			Category: "jwt",
		}},
	}
	if err := CaptureStep(store, &step); err != nil {
		t.Fatal(err)
	}
	if err := ScrubStep(store, &step); err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(step.Response.Body), "{{jwt:alice}}") {
		t.Fatalf("body not scrubbed: %s", step.Response.Body)
	}
	if strings.Contains(string(step.Response.Body), testJWT) {
		t.Fatal("jwt left in body")
	}
	got, err := store.Expand("Bearer {{jwt:alice}}")
	if err != nil {
		t.Fatal(err)
	}
	if got != "Bearer "+testJWT {
		t.Fatalf("expand: %q", got)
	}
	if _, err := store.Expand("{{missing}}"); err == nil || !strings.Contains(err.Error(), "unresolved") {
		t.Fatalf("missing placeholder: %v", err)
	}

	step2 := Step{
		ID: "pkce",
		Request: Request{
			Method: "POST",
			Path:   "/authorize",
			Body:   Body("code_verifier=pkceVerifierValue1&client_id=x"),
		},
		Response: Response{
			Status:  302,
			Headers: map[string]string{"Location": "/cb?code=oauthCode99"},
		},
		Capture: []CaptureRule{
			{From: "request.form", Name: "code_verifier", As: "pkce:alice", Category: "pkce"},
			{From: "response.location.query", Name: "code", As: "oauth:alice-code", Category: "oauth_code"},
		},
	}
	if err := CaptureStep(store, &step2); err != nil {
		t.Fatal(err)
	}
	if err := ScrubStep(store, &step2); err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(step2.Request.Body), "{{pkce:alice}}") || strings.Contains(string(step2.Request.Body), "pkceVerifierValue1") {
		t.Fatalf("pkce not scrubbed: %s", step2.Request.Body)
	}
	if !strings.Contains(step2.Response.Headers["Location"], "{{oauth:alice-code}}") {
		t.Fatalf("code not scrubbed: %v", step2.Response.Headers)
	}
}

func TestScrubRejectsUnclassifiedAndPersistsVars(t *testing.T) {
	dir := t.TempDir()
	varsPath := filepath.Join(dir, "vars.yaml")
	store, err := OpenStore(varsPath)
	if err != nil {
		t.Fatal(err)
	}
	step := Step{
		ID: "login",
		Response: Response{
			Headers: map[string]string{"Content-Type": "application/json"},
			Body:    Body(`{"token":"` + testJWT + `"}`),
		},
		Capture: []CaptureRule{{From: "response.json", Path: "$.token", As: "jwt:alice", Category: "jwt"}},
	}
	if err := CaptureStep(store, &step); err != nil {
		t.Fatal(err)
	}
	if err := ScrubStep(store, &step); err != nil {
		t.Fatal(err)
	}
	if err := store.Save(); err != nil {
		t.Fatal(err)
	}
	raw, err := os.ReadFile(varsPath)
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(raw), testJWT) {
		t.Fatalf("vars missing secret:\n%s", raw)
	}
	st, err := os.Stat(varsPath)
	if err != nil {
		t.Fatal(err)
	}
	if st.Mode().Perm() != 0o600 {
		t.Fatalf("mode %o", st.Mode().Perm())
	}
	unknown := Step{
		ID: "bad",
		Response: Response{Body: Body(`{"token":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJib2IifQ.otherSignatureValue99"}`)},
	}
	if err := ScrubStep(store, &unknown); err == nil {
		t.Fatal("unclassified leftover jwt must fail")
	}
}

func TestProxyLoginTokenAndPKCESession(t *testing.T) {
	upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch {
		case r.Method == http.MethodPost && r.URL.Path == "/login":
			w.Header().Set("Content-Type", "application/json")
			_, _ = w.Write([]byte(`{"token":"` + testJWT + `"}`))
		case r.URL.Path == "/me":
			if r.Header.Get("Authorization") != "Bearer "+testJWT {
				http.Error(w, "no", http.StatusUnauthorized)
				return
			}
			w.Header().Set("Content-Type", "application/json")
			_, _ = w.Write([]byte(`{"ok":true}`))
		case r.URL.Path == "/authorize":
			body, _ := io.ReadAll(r.Body)
			if !strings.Contains(string(body), "code_verifier=pkceVerifierValue1") {
				http.Error(w, "missing verifier", http.StatusBadRequest)
				return
			}
			w.Header().Set("Location", "/cb?code=oauthCode99")
			w.WriteHeader(http.StatusFound)
		default:
			http.NotFound(w, r)
		}
	}))
	t.Cleanup(upstream.Close)

	fixtures := t.TempDir()
	varsPath := filepath.Join(t.TempDir(), "vars.yaml")
	rules := mustParseRules(t, ""+
		"client: nuxt\n"+
		"keep_request_headers:\n"+
		"  - Authorization\n"+
		"  - Content-Type\n"+
		"keep_response_headers:\n"+
		"  - Content-Type\n"+
		"  - Location\n"+
		"routes:\n"+
		"  - method: POST\n"+
		"    path: /login\n"+
		"    capture:\n"+
		"      - from: response.json\n"+
		"        path: $.token\n"+
		"        as: jwt:alice\n"+
		"        identity: alice\n"+
		"        category: jwt\n"+
		"  - method: GET\n"+
		"    path: /me\n"+
		"  - method: POST\n"+
		"    path: /authorize\n"+
		"    capture:\n"+
		"      - from: request.form\n"+
		"        name: code_verifier\n"+
		"        as: pkce:alice\n"+
		"        category: pkce\n"+
		"      - from: response.location.query\n"+
		"        name: code\n"+
		"        as: oauth:alice-code\n"+
		"        category: oauth_code\n")
	proxy, err := NewProxy(ProxyConfig{
		Listen:   "127.0.0.1:0",
		Upstream: upstream.URL,
		Fixtures: fixtures,
		VarsPath: varsPath,
		Rules:    rules,
	})
	if err != nil {
		t.Fatal(err)
	}
	srv := httptest.NewServer(proxy.Handler())
	t.Cleanup(srv.Close)

	post(t, srv.URL+"/login", "sess", "application/json", `{}`)
	req, err := http.NewRequest(http.MethodGet, srv.URL+"/me", nil)
	if err != nil {
		t.Fatal(err)
	}
	req.Header.Set(SessionHeader, "sess")
	req.Header.Set("Authorization", "Bearer "+testJWT)
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		t.Fatal(err)
	}
	resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("me: %d", resp.StatusCode)
	}
	post(t, srv.URL+"/authorize", "sess", "application/x-www-form-urlencoded", "code_verifier=pkceVerifierValue1")
	if err := proxy.Flush(); err != nil {
		t.Fatal(err)
	}

	raw, err := os.ReadFile(filepath.Join(fixtures, "nuxt", "sess.yaml"))
	if err != nil {
		t.Fatal(err)
	}
	text := string(raw)
	if strings.Contains(text, testJWT) || strings.Contains(text, "pkceVerifierValue1") || strings.Contains(text, "oauthCode99") {
		t.Fatalf("secrets in fixture:\n%s", text)
	}
	if !strings.Contains(text, "{{jwt:alice}}") || !strings.Contains(text, "{{pkce:alice}}") || !strings.Contains(text, "{{oauth:alice-code}}") {
		t.Fatalf("placeholders missing:\n%s", text)
	}

	flow, err := LoadFlow(filepath.Join(fixtures, "nuxt", "sess.yaml"))
	if err != nil {
		t.Fatal(err)
	}
	store, err := OpenStore(varsPath)
	if err != nil {
		t.Fatal(err)
	}
	if _, err := ReplayFlow(context.Background(), flow, ReplayConfig{Target: upstream.URL, Store: store}); err != nil {
		t.Fatalf("replay captured session: %v", err)
	}
}

func post(t *testing.T, url, session, ct, body string) {
	t.Helper()
	req, err := http.NewRequest(http.MethodPost, url, strings.NewReader(body))
	if err != nil {
		t.Fatal(err)
	}
	req.Header.Set(SessionHeader, session)
	req.Header.Set("Content-Type", ct)
	client := &http.Client{
		CheckRedirect: func(*http.Request, []*http.Request) error {
			return http.ErrUseLastResponse
		},
	}
	resp, err := client.Do(req)
	if err != nil {
		t.Fatal(err)
	}
	resp.Body.Close()
	if resp.StatusCode >= 400 {
		t.Fatalf("%s: %d", url, resp.StatusCode)
	}
}