package api

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

	"github.com/go-chi/chi/v5"
)

func newMeProfileRouter(h *handlers) chi.Router {
	r := chi.NewRouter()
	r.Put("/api/me/profile", h.handleUpdateMyProfile)
	return r
}

func TestUpdateProfile_DisplayNameOnly(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	user := seedUser(t, pool, "prof1", "pw", false)

	body := `{"display_name":"My Name"}`
	req := httptest.NewRequest(http.MethodPut, "/api/me/profile", bytes.NewReader([]byte(body)))
	req = withUser(req, user)
	rec := httptest.NewRecorder()
	newMeProfileRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200; body=%s", rec.Code, rec.Body.String())
	}
	var resp meProfileResp
	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if resp.DisplayName == nil || *resp.DisplayName != "My Name" {
		t.Errorf("display_name = %v, want 'My Name'", resp.DisplayName)
	}
}

func TestUpdateProfile_EmailOnly_Lowercased(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	user := seedUser(t, pool, "prof2", "pw", false)

	body := `{"email":"User@Example.COM"}`
	req := httptest.NewRequest(http.MethodPut, "/api/me/profile", bytes.NewReader([]byte(body)))
	req = withUser(req, user)
	rec := httptest.NewRecorder()
	newMeProfileRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200; body=%s", rec.Code, rec.Body.String())
	}

	// Verify DB row is lowercased.
	var email *string
	if err := pool.QueryRow(context.Background(),
		"SELECT email FROM users WHERE id = $1", user.ID).Scan(&email); err != nil {
		t.Fatalf("read email: %v", err)
	}
	if email == nil || *email != "user@example.com" {
		t.Errorf("DB email = %v, want 'user@example.com'", email)
	}
}

func TestUpdateProfile_BothFields(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	user := seedUser(t, pool, "prof3", "pw", false)

	body := `{"display_name":"Both Fields","email":"both@example.com"}`
	req := httptest.NewRequest(http.MethodPut, "/api/me/profile", bytes.NewReader([]byte(body)))
	req = withUser(req, user)
	rec := httptest.NewRecorder()
	newMeProfileRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200; body=%s", rec.Code, rec.Body.String())
	}
	var resp meProfileResp
	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if resp.DisplayName == nil || *resp.DisplayName != "Both Fields" {
		t.Errorf("display_name = %v, want 'Both Fields'", resp.DisplayName)
	}
	if resp.Email == nil || *resp.Email != "both@example.com" {
		t.Errorf("email = %v, want 'both@example.com'", resp.Email)
	}
}

func TestUpdateProfile_EmptyBody_NoOp(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	user := seedUser(t, pool, "prof4", "pw", false)

	body := `{}`
	req := httptest.NewRequest(http.MethodPut, "/api/me/profile", bytes.NewReader([]byte(body)))
	req = withUser(req, user)
	rec := httptest.NewRecorder()
	newMeProfileRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200 (no-op); body=%s", rec.Code, rec.Body.String())
	}
	var resp meProfileResp
	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
		t.Fatalf("decode: %v", err)
	}
	// Neither field should have been set (seeded without them).
	if resp.DisplayName != nil {
		t.Errorf("display_name = %v, want nil (no-op)", resp.DisplayName)
	}
}

func TestUpdateProfile_InvalidEmail_400(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	user := seedUser(t, pool, "prof5", "pw", false)

	body := `{"email":"notanemail"}`
	req := httptest.NewRequest(http.MethodPut, "/api/me/profile", bytes.NewReader([]byte(body)))
	req = withUser(req, user)
	rec := httptest.NewRecorder()
	newMeProfileRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusBadRequest {
		t.Errorf("status = %d, want 400 (email_invalid)", rec.Code)
	}
}

func TestUpdateProfile_EmailTaken_409(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	other := seedUser(t, pool, "prof6other", "pw", false)
	user := seedUser(t, pool, "prof6user", "pw", false)

	// Give the other user an email directly.
	if _, err := pool.Exec(context.Background(),
		"UPDATE users SET email = 'taken@example.com' WHERE id = $1", other.ID); err != nil {
		t.Fatalf("setup email: %v", err)
	}

	body := `{"email":"taken@example.com"}`
	req := httptest.NewRequest(http.MethodPut, "/api/me/profile", bytes.NewReader([]byte(body)))
	req = withUser(req, user)
	rec := httptest.NewRecorder()
	newMeProfileRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusConflict {
		t.Errorf("status = %d, want 409 (email_taken)", rec.Code)
	}
}

func TestUpdateProfile_ClearDisplayName(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	user := seedUser(t, pool, "prof7", "pw", false)

	// First, set a display name.
	if _, err := pool.Exec(context.Background(),
		"UPDATE users SET display_name = 'Will Be Cleared' WHERE id = $1", user.ID); err != nil {
		t.Fatalf("setup display_name: %v", err)
	}

	// Clear it by sending empty string.
	body := `{"display_name":""}`
	req := httptest.NewRequest(http.MethodPut, "/api/me/profile", bytes.NewReader([]byte(body)))
	req = withUser(req, user)
	rec := httptest.NewRecorder()
	newMeProfileRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200; body=%s", rec.Code, rec.Body.String())
	}

	// DB should now have NULL display_name.
	var dn *string
	if err := pool.QueryRow(context.Background(),
		"SELECT display_name FROM users WHERE id = $1", user.ID).Scan(&dn); err != nil {
		t.Fatalf("read display_name: %v", err)
	}
	if dn != nil {
		t.Errorf("display_name = %v, want nil (cleared)", dn)
	}
}