package api

import (
	"bytes"
	"context"
	"database/sql"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"stow/backend/internal/store"
)

type fakeStore struct {
	created  bool
	lastUser string
	lastItem store.NewItem
}

func (f *fakeStore) CreateAnonymousSession(context.Context) (string, string, error) {
	return "user-1", "token-1", nil
}
func (f *fakeStore) Authenticate(_ context.Context, token string) (string, error) {
	if token != "token-1" {
		return "", sql.ErrNoRows
	}
	return "user-1", nil
}
func (f *fakeStore) CreateItem(_ context.Context, userID string, item store.NewItem) (store.Item, error) {
	f.created, f.lastUser, f.lastItem = true, userID, item
	return store.Item{ID: "item-1", SourceType: item.SourceType, PrimaryType: item.PrimaryType, Title: item.Title, Summary: item.Summary, Status: "ready", Tags: item.Tags, CreatedAt: time.Now()}, nil
}
func (f *fakeStore) GetItem(context.Context, string, string) (store.Item, error) {
	return store.Item{}, store.ErrNotFound
}
func (f *fakeStore) ListItems(context.Context, string, int) ([]store.Item, error) {
	return []store.Item{}, nil
}
func (f *fakeStore) SearchItems(context.Context, string, string, int) ([]store.Item, error) {
	return []store.Item{}, nil
}
func (f *fakeStore) UpdateItem(context.Context, string, string, store.ItemPatch) (store.Item, error) {
	return store.Item{}, store.ErrNotFound
}
func (f *fakeStore) DeleteItem(context.Context, string, string) error { return store.ErrNotFound }

func TestItemsRequireSession(t *testing.T) {
	fake := &fakeStore{}
	request := httptest.NewRequest(http.MethodPost, "/v1/items", bytes.NewBufferString(`{"source_type":"manual_text","title":"咖啡店"}`))
	response := httptest.NewRecorder()
	New(fake).ServeHTTP(response, request)
	if response.Code != http.StatusUnauthorized {
		t.Fatalf("status = %d, want 401", response.Code)
	}
	if fake.created {
		t.Fatal("item was created without authentication")
	}
}

func TestCreateItemValidatesAndUsesAuthenticatedUser(t *testing.T) {
	fake := &fakeStore{}
	handler := New(fake)
	for _, test := range []struct {
		name, body string
		want       int
	}{
		{"invalid source", `{"source_type":"unknown","title":"咖啡店"}`, http.StatusBadRequest},
		{"valid item", `{"source_type":"manual_text","title":"咖啡店","tags":["上海"]}`, http.StatusCreated},
	} {
		t.Run(test.name, func(t *testing.T) {
			request := httptest.NewRequest(http.MethodPost, "/v1/items", bytes.NewBufferString(test.body))
			request.Header.Set("Authorization", "Bearer token-1")
			response := httptest.NewRecorder()
			handler.ServeHTTP(response, request)
			if response.Code != test.want {
				t.Fatalf("status = %d, want %d: %s", response.Code, test.want, response.Body.String())
			}
		})
	}
	if !fake.created || fake.lastUser != "user-1" || fake.lastItem.Title != "咖啡店" {
		t.Fatalf("wrong authenticated create: %+v", fake)
	}
}

func TestAnonymousSessionReturnsToken(t *testing.T) {
	response := httptest.NewRecorder()
	New(&fakeStore{}).ServeHTTP(response, httptest.NewRequest(http.MethodPost, "/v1/session/anonymous", nil))
	if response.Code != http.StatusCreated {
		t.Fatalf("status = %d", response.Code)
	}
	var body struct {
		Code    string            `json:"code"`
		Message string            `json:"message"`
		Data    map[string]string `json:"data"`
	}
	if err := json.Unmarshal(response.Body.Bytes(), &body); err != nil {
		t.Fatal(err)
	}
	if body.Code != "ok" || body.Data["access_token"] != "token-1" || body.Data["token_type"] != "Bearer" {
		t.Fatalf("unexpected response: %v", body)
	}
}

func TestAllResponsesUseEnvelope(t *testing.T) {
	handler := New(&fakeStore{})
	for _, test := range []struct {
		method string
		path   string
		want   int
	}{
		{http.MethodGet, "/v1/health", http.StatusOK},
		{http.MethodGet, "/v1/items", http.StatusUnauthorized},
		{http.MethodGet, "/missing", http.StatusNotFound},
		{http.MethodPut, "/v1/health", http.StatusMethodNotAllowed},
	} {
		response := httptest.NewRecorder()
		handler.ServeHTTP(response, httptest.NewRequest(test.method, test.path, nil))
		if response.Code != test.want {
			t.Fatalf("%s %s: status %d, want %d", test.method, test.path, response.Code, test.want)
		}
		var body struct {
			Code    string          `json:"code"`
			Message string          `json:"message"`
			Data    json.RawMessage `json:"data"`
		}
		if err := json.Unmarshal(response.Body.Bytes(), &body); err != nil {
			t.Fatalf("%s %s: %v", test.method, test.path, err)
		}
		if body.Code == "" || body.Message == "" || body.Data == nil {
			t.Fatalf("%s %s: invalid envelope: %s", test.method, test.path, response.Body.String())
		}
	}
}