package api

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/go-chi/chi/v5"
	"github.com/kindredsystems/silo/internal/auth"
	"github.com/kindredsystems/silo/internal/db"
	"github.com/kindredsystems/silo/internal/modules"
	"github.com/kindredsystems/silo/internal/schema"
	"github.com/kindredsystems/silo/internal/testutil"
	"github.com/rs/zerolog"
)

// newAuthTestServer creates a Server with a real auth service (for token tests).
func newAuthTestServer(t *testing.T) *Server {
	t.Helper()
	pool := testutil.MustConnectTestPool(t)
	database := db.NewFromPool(pool)
	users := db.NewUserRepository(database)
	tokens := db.NewTokenRepository(database)
	authSvc := auth.NewService(zerolog.Nop(), users, tokens)
	broker := NewBroker(zerolog.Nop())
	state := NewServerState(zerolog.Nop(), nil, broker)
	return NewServer(
		zerolog.Nop(),
		database,
		map[string]*schema.Schema{},
		"",      // schemasDir
		nil,     // storage
		authSvc, // authService
		nil,     // sessionManager
		nil,     // oidcBackend
		nil,     // authConfig
		broker,
		state,
		nil,                   // jobDefs
		"",                    // jobDefsDir
		modules.NewRegistry(), // modules
		nil,                   // cfg
		nil,                   // workflows
	)
}

// ensureTestUser creates a user in the DB and returns their ID.
func ensureTestUser(t *testing.T, s *Server, username string) string {
	t.Helper()
	u := &db.User{
		Username:    username,
		DisplayName: "Test " + username,
		Email:       username + "@test.local",
		AuthSource:  "local",
		Role:        "admin",
	}
	users := db.NewUserRepository(s.db)
	if err := users.Upsert(context.Background(), u); err != nil {
		t.Fatalf("upserting user: %v", err)
	}
	return u.ID
}

func newAuthRouter(s *Server) http.Handler {
	r := chi.NewRouter()
	r.Get("/api/auth/me", s.HandleGetCurrentUser)
	r.Post("/api/auth/tokens", s.HandleCreateToken)
	r.Get("/api/auth/tokens", s.HandleListTokens)
	r.Delete("/api/auth/tokens/{id}", s.HandleRevokeToken)
	r.Get("/api/auth/config", s.HandleAuthConfig)
	return r
}

func TestHandleGetCurrentUser(t *testing.T) {
	s := newTestServer(t)
	router := newAuthRouter(s)

	req := authRequest(httptest.NewRequest("GET", "/api/auth/me", nil))
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("status: got %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
	}

	var resp map[string]any
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatalf("decoding response: %v", err)
	}
	if resp["username"] != "testadmin" {
		t.Errorf("username: got %v, want %q", resp["username"], "testadmin")
	}
	if resp["role"] != "admin" {
		t.Errorf("role: got %v, want %q", resp["role"], "admin")
	}
}

func TestHandleGetCurrentUserUnauth(t *testing.T) {
	s := newTestServer(t)
	router := newAuthRouter(s)

	// No auth context
	req := httptest.NewRequest("GET", "/api/auth/me", nil)
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusUnauthorized {
		t.Errorf("status: got %d, want %d", w.Code, http.StatusUnauthorized)
	}
}

func TestHandleAuthConfig(t *testing.T) {
	s := newTestServer(t)
	router := newAuthRouter(s)

	req := httptest.NewRequest("GET", "/api/auth/config", nil)
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("status: got %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
	}

	var resp map[string]any
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatalf("decoding response: %v", err)
	}
	// With nil oidc and nil authConfig, both should be false
	if resp["oidc_enabled"] != false {
		t.Errorf("oidc_enabled: got %v, want false", resp["oidc_enabled"])
	}
}

func TestHandleCreateAndListTokens(t *testing.T) {
	s := newAuthTestServer(t)
	router := newAuthRouter(s)

	// Create a user in the DB so token generation can associate
	userID := ensureTestUser(t, s, "tokenuser")

	// Inject user with the DB-assigned ID
	u := &auth.User{
		ID:          userID,
		Username:    "tokenuser",
		DisplayName: "Test tokenuser",
		Role:        auth.RoleAdmin,
		AuthSource:  "local",
	}

	// Create token
	body := `{"name":"test-token"}`
	req := httptest.NewRequest("POST", "/api/auth/tokens", strings.NewReader(body))
	req = req.WithContext(auth.ContextWithUser(req.Context(), u))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusCreated {
		t.Fatalf("create token status: got %d, want %d; body: %s", w.Code, http.StatusCreated, w.Body.String())
	}

	var createResp map[string]any
	if err := json.Unmarshal(w.Body.Bytes(), &createResp); err != nil {
		t.Fatalf("decoding create response: %v", err)
	}
	if createResp["token"] == nil || createResp["token"] == "" {
		t.Error("expected token in response")
	}
	tokenID, _ := createResp["id"].(string)

	// List tokens
	req = httptest.NewRequest("GET", "/api/auth/tokens", nil)
	req = req.WithContext(auth.ContextWithUser(req.Context(), u))
	w = httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("list tokens status: got %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
	}

	var tokens []map[string]any
	if err := json.Unmarshal(w.Body.Bytes(), &tokens); err != nil {
		t.Fatalf("decoding list response: %v", err)
	}
	if len(tokens) != 1 {
		t.Errorf("expected 1 token, got %d", len(tokens))
	}

	// Revoke token
	req = httptest.NewRequest("DELETE", "/api/auth/tokens/"+tokenID, nil)
	req = req.WithContext(auth.ContextWithUser(req.Context(), u))
	w = httptest.NewRecorder()
	router.ServeHTTP(w, req)

	if w.Code != http.StatusNoContent {
		t.Errorf("revoke token status: got %d, want %d; body: %s", w.Code, http.StatusNoContent, w.Body.String())
	}

	// List again — should be empty
	req = httptest.NewRequest("GET", "/api/auth/tokens", nil)
	req = req.WithContext(auth.ContextWithUser(req.Context(), u))
	w = httptest.NewRecorder()
	router.ServeHTTP(w, req)

	json.Unmarshal(w.Body.Bytes(), &tokens)
	if len(tokens) != 0 {
		t.Errorf("expected 0 tokens after revoke, got %d", len(tokens))
	}
}