package auth

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

	"github.com/gin-gonic/gin"

	"galo/internal/models"
)

type authResponse struct {
	User   models.SelfUser `json:"user"`
	Tokens *TokenPair      `json:"tokens"`
}

func newTestRouter(t *testing.T) *gin.Engine {
	t.Helper()
	gin.SetMode(gin.TestMode)
	r := gin.New()
	h := NewHandler(newTestService(t))
	r.POST("/auth/register", h.Register)
	r.POST("/auth/login", h.Login)
	authed := r.Group("")
	authed.Use(h.svc.Middleware())
	authed.GET("/auth/me", h.Me)
	authed.PATCH("/auth/me", h.UpdateMe)
	authed.POST("/auth/me/password", h.ChangePassword)
	authed.POST("/auth/me/identifiers", h.AddIdentifier)
	authed.DELETE("/auth/me", h.DeleteMe)
	return r
}

func doJSON(r *gin.Engine, method, path, token string, body any) *httptest.ResponseRecorder {
	var buf bytes.Buffer
	if body != nil {
		_ = json.NewEncoder(&buf).Encode(body)
	} else {
		buf.WriteString("{}")
	}
	req := httptest.NewRequest(method, path, &buf)
	req.Header.Set("Content-Type", "application/json")
	if token != "" {
		req.Header.Set("Authorization", "Bearer "+token)
	}
	rec := httptest.NewRecorder()
	r.ServeHTTP(rec, req)
	return rec
}

func decodeAuth(t *testing.T, rec *httptest.ResponseRecorder) authResponse {
	t.Helper()
	var out authResponse
	if err := json.Unmarshal(rec.Body.Bytes(), &out); err != nil {
		t.Fatalf("decode %s: %v", rec.Body.String(), err)
	}
	return out
}

func TestRegisterHandlerPhoneOnly(t *testing.T) {
	r := newTestRouter(t)
	rec := doJSON(r, http.MethodPost, "/auth/register", "", map[string]string{
		"phone": "+15550000021", "password": "password123", "name": "Phone",
	})
	if rec.Code != http.StatusCreated {
		t.Fatalf("status = %d body = %s", rec.Code, rec.Body.String())
	}
	out := decodeAuth(t, rec)
	if out.User.Phone != "+15550000021" || out.User.Email != "" {
		t.Fatalf("user = %+v", out.User)
	}
	if out.Tokens == nil || out.Tokens.AccessToken == "" {
		t.Fatalf("no tokens")
	}
}

func TestRegisterHandlerRequiresIdentifier(t *testing.T) {
	r := newTestRouter(t)
	rec := doJSON(r, http.MethodPost, "/auth/register", "", map[string]string{
		"password": "password123", "name": "NoId",
	})
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("status = %d body = %s", rec.Code, rec.Body.String())
	}
}

func TestLoginHandlerByIdentifier(t *testing.T) {
	r := newTestRouter(t)
	reg := doJSON(r, http.MethodPost, "/auth/register", "", map[string]string{
		"email": "handler@test.local", "password": "password123", "name": "H",
	})
	if reg.Code != http.StatusCreated {
		t.Fatalf("register status = %d", reg.Code)
	}

	rec := doJSON(r, http.MethodPost, "/auth/login", "", map[string]string{
		"identifier": "Handler@Test.Local", "password": "password123",
	})
	if rec.Code != http.StatusOK {
		t.Fatalf("login status = %d body = %s", rec.Code, rec.Body.String())
	}
	if out := decodeAuth(t, rec); out.Tokens == nil {
		t.Fatalf("no tokens")
	}
}

func TestMeHandlerExposesPhoneToOwner(t *testing.T) {
	r := newTestRouter(t)
	reg := doJSON(r, http.MethodPost, "/auth/register", "", map[string]string{
		"email": "me@test.local", "phone": "+15550000022", "password": "password123", "name": "Me",
	})
	out := decodeAuth(t, reg)

	rec := doJSON(r, http.MethodGet, "/auth/me", out.Tokens.AccessToken, nil)
	if rec.Code != http.StatusOK {
		t.Fatalf("me status = %d body = %s", rec.Code, rec.Body.String())
	}
	var body struct {
		User models.SelfUser `json:"user"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if body.User.Phone != "+15550000022" {
		t.Fatalf("phone not exposed to owner: %s", rec.Body.String())
	}
}

func TestUpdateMeHandler(t *testing.T) {
	r := newTestRouter(t)
	reg := doJSON(r, http.MethodPost, "/auth/register", "", map[string]string{
		"email": "upd@test.local", "password": "password123", "name": "Old",
	})
	token := decodeAuth(t, reg).Tokens.AccessToken

	if rec := doJSON(r, http.MethodPatch, "/auth/me", token, map[string]string{"name": "  "}); rec.Code != http.StatusBadRequest {
		t.Fatalf("empty name status = %d body = %s", rec.Code, rec.Body.String())
	}

	rec := doJSON(r, http.MethodPatch, "/auth/me", token, map[string]string{"name": "New"})
	if rec.Code != http.StatusOK {
		t.Fatalf("update status = %d body = %s", rec.Code, rec.Body.String())
	}
	var body struct {
		User models.SelfUser `json:"user"`
	}
	_ = json.Unmarshal(rec.Body.Bytes(), &body)
	if body.User.Name != "New" {
		t.Fatalf("name not updated: %s", rec.Body.String())
	}
}

func TestChangePasswordHandler(t *testing.T) {
	r := newTestRouter(t)
	reg := doJSON(r, http.MethodPost, "/auth/register", "", map[string]string{
		"email": "cp@test.local", "password": "password123", "name": "CP",
	})
	out := decodeAuth(t, reg)

	if rec := doJSON(r, http.MethodPost, "/auth/me/password", out.Tokens.AccessToken, map[string]string{
		"current_password": "wrong", "new_password": "newpassword",
	}); rec.Code != http.StatusUnauthorized {
		t.Fatalf("wrong current status = %d", rec.Code)
	}
	if rec := doJSON(r, http.MethodPost, "/auth/me/password", out.Tokens.AccessToken, map[string]string{
		"current_password": "password123", "new_password": "newpassword",
	}); rec.Code != http.StatusNoContent {
		t.Fatalf("change status = %d body = %s", rec.Code, rec.Body.String())
	}
}

func TestAddIdentifierHandler(t *testing.T) {
	r := newTestRouter(t)
	reg := doJSON(r, http.MethodPost, "/auth/register", "", map[string]string{
		"email": "addh@test.local", "password": "password123", "name": "Add",
	})
	token := decodeAuth(t, reg).Tokens.AccessToken

	if rec := doJSON(r, http.MethodPost, "/auth/me/identifiers", token, map[string]string{"email": "x@test.local"}); rec.Code != http.StatusBadRequest {
		t.Fatalf("re-set email status = %d", rec.Code)
	}

	rec := doJSON(r, http.MethodPost, "/auth/me/identifiers", token, map[string]string{"phone": "+15550000023"})
	if rec.Code != http.StatusOK {
		t.Fatalf("add status = %d body = %s", rec.Code, rec.Body.String())
	}
	var body struct {
		User models.SelfUser `json:"user"`
	}
	_ = json.Unmarshal(rec.Body.Bytes(), &body)
	if body.User.Phone != "+15550000023" {
		t.Fatalf("phone not added: %s", rec.Body.String())
	}
}

func TestDeleteMeHandler(t *testing.T) {
	r := newTestRouter(t)
	reg := doJSON(r, http.MethodPost, "/auth/register", "", map[string]string{
		"email": "delh@test.local", "password": "password123", "name": "Del",
	})
	token := decodeAuth(t, reg).Tokens.AccessToken

	if rec := doJSON(r, http.MethodDelete, "/auth/me", token, map[string]string{"password": "wrong"}); rec.Code != http.StatusUnauthorized {
		t.Fatalf("wrong password status = %d", rec.Code)
	}
	if rec := doJSON(r, http.MethodDelete, "/auth/me", token, map[string]string{"password": "password123"}); rec.Code != http.StatusNoContent {
		t.Fatalf("delete status = %d body = %s", rec.Code, rec.Body.String())
	}
	if rec := doJSON(r, http.MethodGet, "/auth/me", token, nil); rec.Code != http.StatusUnauthorized {
		t.Fatalf("me after delete status = %d", rec.Code)
	}
}