package controller

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

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/assert"
	"github.com/topfans/backend/pkg/models"
	"github.com/topfans/backend/gateway/service"
)

// fakeAppDownloadSvc 是 AppDownloadSvc 的 in-memory fake
type fakeAppDownloadSvc struct {
	configs    []models.AppDownloadConfig
	getAllErr  error
	syncErr    error
	syncCalled bool
	lastSyncReq *service.SyncVersionRequest
}

func (f *fakeAppDownloadSvc) GetAllNativeApp(ctx context.Context) ([]models.AppDownloadConfig, error) {
	if f.getAllErr != nil {
		return nil, f.getAllErr
	}
	return f.configs, nil
}

func (f *fakeAppDownloadSvc) SyncVersion(ctx context.Context, req *service.SyncVersionRequest) error {
	f.syncCalled = true
	f.lastSyncReq = req
	return f.syncErr
}

func setupTestRouter(ctrl *AppDownloadController) *gin.Engine {
	gin.SetMode(gin.TestMode)
	r := gin.New()
	r.GET("/api/v1/app/download-urls", ctrl.GetDownloadUrls)
	r.POST("/api/v1/admin/app/versions/sync", ctrl.SyncVersion)
	return r
}

// ========== GET /api/v1/app/download-urls ==========

func TestGetDownloadUrls_Success(t *testing.T) {
	gin.SetMode(gin.TestMode)

	fakeSvc := &fakeAppDownloadSvc{
		configs: []models.AppDownloadConfig{
			{Platform: "android", Type: "native_app", DownloadURL: "https://app.apk", Version: "1.0.5"},
			{Platform: "ios", Type: "native_app", DownloadURL: "https://apps.apple.com/...", Version: "1.0.5"},
		},
	}
	ctrl := NewAppDownloadController(fakeSvc)
	router := setupTestRouter(ctrl)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/app/download-urls", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, 200, w.Code)

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	assert.Equal(t, float64(0), resp["code"])

	data := resp["data"].(map[string]interface{})
	assert.NotNil(t, data["android"])
	assert.NotNil(t, data["ios"])
}

func TestGetDownloadUrls_EmptyData(t *testing.T) {
	gin.SetMode(gin.TestMode)

	fakeSvc := &fakeAppDownloadSvc{configs: []models.AppDownloadConfig{}}
	ctrl := NewAppDownloadController(fakeSvc)
	router := setupTestRouter(ctrl)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/app/download-urls", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, 200, w.Code)

	var resp map[string]interface{}
	json.Unmarshal(w.Body.Bytes(), &resp)
	assert.Equal(t, float64(0), resp["code"])

	data := resp["data"].(map[string]interface{})
	assert.Nil(t, data["android"])
	assert.Nil(t, data["ios"])
}

func TestGetDownloadUrls_ServiceError(t *testing.T) {
	gin.SetMode(gin.TestMode)

	fakeSvc := &fakeAppDownloadSvc{getAllErr: errors.New("db down")}
	ctrl := NewAppDownloadController(fakeSvc)
	router := setupTestRouter(ctrl)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/app/download-urls", nil)
	router.ServeHTTP(w, req)

	assert.Equal(t, 500, w.Code)
}

// ========== POST /api/v1/admin/app/versions/sync ==========

func TestSyncVersion_InvalidJSON(t *testing.T) {
	gin.SetMode(gin.TestMode)

	fakeSvc := &fakeAppDownloadSvc{}
	ctrl := NewAppDownloadController(fakeSvc)
	router := setupTestRouter(ctrl)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/admin/app/versions/sync",
		strings.NewReader(`{"android": "not_an_object"}`))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, 400, w.Code)
}

func TestSyncVersion_MissingRequiredField(t *testing.T) {
	gin.SetMode(gin.TestMode)

	fakeSvc := &fakeAppDownloadSvc{}
	ctrl := NewAppDownloadController(fakeSvc)
	router := setupTestRouter(ctrl)

	// 缺少必填字段 url
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/admin/app/versions/sync",
		strings.NewReader(`{"android": {"version": "1.0.5", "type": "native_app"}}`))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, 400, w.Code)
}

func TestSyncVersion_Success(t *testing.T) {
	gin.SetMode(gin.TestMode)

	fakeSvc := &fakeAppDownloadSvc{}
	ctrl := NewAppDownloadController(fakeSvc)
	router := setupTestRouter(ctrl)

	body := `{
		"android": {"url": "https://app.apk", "version": "1.0.5", "type": "native_app"},
		"ios": {"url": "https://apps.apple.com/...", "version": "1.0.5", "type": "native_app"}
	}`
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/api/v1/admin/app/versions/sync",
		strings.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	assert.Equal(t, 200, w.Code)
	assert.True(t, fakeSvc.syncCalled)
	assert.NotNil(t, fakeSvc.lastSyncReq.Android)
	assert.NotNil(t, fakeSvc.lastSyncReq.IOS)
}