package middleware

import (
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/assert"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"

	"github.com/wangjia/jiu/backend/internal/model"
)

func TestCalcLicensePhase(t *testing.T) {
	now := time.Now()

	// nil = perpetual → normal
	assert.Equal(t, PhaseNormal, CalcLicensePhase(nil))

	// future expiry → normal
	future := now.Add(10 * 24 * time.Hour)
	assert.Equal(t, PhaseNormal, CalcLicensePhase(&future))

	// just expired (1h ago) → grace
	grace := now.Add(-1 * time.Hour)
	assert.Equal(t, PhaseGrace, CalcLicensePhase(&grace))

	// expired 6 days ago → grace (boundary)
	grace6d := now.Add(-6 * 24 * time.Hour)
	assert.Equal(t, PhaseGrace, CalcLicensePhase(&grace6d))

	// expired 8 days ago → readonly
	readonly := now.Add(-8 * 24 * time.Hour)
	assert.Equal(t, PhaseReadOnly, CalcLicensePhase(&readonly))

	// expired 14 days ago → readonly (boundary)
	readonly14d := now.Add(-14 * 24 * time.Hour)
	assert.Equal(t, PhaseReadOnly, CalcLicensePhase(&readonly14d))

	// expired 16 days ago → locked
	locked := now.Add(-16 * 24 * time.Hour)
	assert.Equal(t, PhaseLocked, CalcLicensePhase(&locked))
}

// TestLicenseGuardUsesLiveDBPhase 验证 LicenseGuard 以「当前 DB 的授权状态」判 phase，
// 而非信任登录时嵌入 token 的快照（lic_exp）。这是「只读模式还是能改数据」的根因修复：
// 即便 token 快照仍是 normal（lic_exp 未来），DB 改成过期后写操作也应立即被拦截。
func TestLicenseGuardUsesLiveDBPhase(t *testing.T) {
	gin.SetMode(gin.TestMode)
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	assert.NoError(t, err)
	// sqlite 不支持 enum/json 列类型，AutoMigrate 会失败，按 testutil 方式用原始 SQL 建表。
	assert.NoError(t, db.Exec(`CREATE TABLE licenses (
		id INTEGER PRIMARY KEY AUTOINCREMENT,
		created_at DATETIME, updated_at DATETIME, deleted_at DATETIME,
		shop_id INTEGER NOT NULL,
		license_key TEXT, type TEXT, tier TEXT DEFAULT 'standard', expires_at DATETIME,
		is_active INTEGER DEFAULT 1, max_devices INTEGER DEFAULT 3,
		features TEXT, device_id TEXT, activated_at DATETIME
	)`).Error)
	now := time.Now()
	tokenFuture := now.Add(30 * 24 * time.Hour).Unix() // token 快照恒为 normal

	// 每个 shop 一条有效授权，DB 到期时间各异；用不同 shopID 规避缓存串扰。
	seed := func(shopID uint64, dbExpiresAt *time.Time) {
		licensePhaseCache.Delete(shopID)
		assert.NoError(t, db.Create(&model.License{
			ShopID: shopID, IsActive: true, ExpiresAt: dbExpiresAt,
		}).Error)
	}

	// invoke 跑一次带 LicenseGuard 的请求，返回（是否被拦截, 状态码）。
	invoke := func(shopID uint64, method string) (bool, int) {
		w := httptest.NewRecorder()
		c, _ := gin.CreateTestContext(w)
		c.Request = httptest.NewRequest(method, "/products", nil)
		c.Set(CtxShopID, shopID)
		c.Set(CtxLicenseExpiresAt, &tokenFuture)
		LicenseGuard(db)(c)
		return c.IsAborted(), w.Code
	}

	// DB 未过期 → 写放行
	future := now.Add(10 * 24 * time.Hour)
	seed(1001, &future)
	aborted, _ := invoke(1001, http.MethodPost)
	assert.False(t, aborted, "DB 未过期应放行写操作")

	// DB 过期 10 天（只读期）→ 即便 token 说 normal，POST 也被 403 拦截
	expired10d := now.Add(-10 * 24 * time.Hour)
	seed(1002, &expired10d)
	aborted, code := invoke(1002, http.MethodPost)
	assert.True(t, aborted, "DB 只读期应拦截写操作")
	assert.Equal(t, http.StatusForbidden, code)

	// 只读期 GET 放行
	aborted, _ = invoke(1002, http.MethodGet)
	assert.False(t, aborted, "只读期 GET 应放行")

	// DB 过期 20 天（锁定期）→ 连 GET 也 403
	expired20d := now.Add(-20 * 24 * time.Hour)
	seed(1003, &expired20d)
	aborted, code = invoke(1003, http.MethodGet)
	assert.True(t, aborted, "锁定期应拦截所有请求")
	assert.Equal(t, http.StatusForbidden, code)
}

// TestLicenseGuardRevokedAndInvalidation 覆盖 #5/#6：
//   - 主动停用（is_active=0，且未过期）应锁定写操作，而非回退到 token 快照继续放行；
//   - 从未配置授权的门店仍回退 token 快照，避免误锁；
//   - InvalidateLicensePhase 让授权变更绕过 30s 缓存即时生效。
func TestLicenseGuardRevokedAndInvalidation(t *testing.T) {
	gin.SetMode(gin.TestMode)
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	assert.NoError(t, err)
	assert.NoError(t, db.Exec(`CREATE TABLE licenses (
		id INTEGER PRIMARY KEY AUTOINCREMENT,
		created_at DATETIME, updated_at DATETIME, deleted_at DATETIME,
		shop_id INTEGER NOT NULL,
		license_key TEXT, type TEXT, tier TEXT DEFAULT 'standard', expires_at DATETIME,
		is_active INTEGER DEFAULT 1, max_devices INTEGER DEFAULT 3,
		features TEXT, device_id TEXT, activated_at DATETIME
	)`).Error)

	now := time.Now()
	tokenFuture := now.Add(30 * 24 * time.Hour).Unix() // token 快照恒为 normal

	invoke := func(shopID uint64, method string) (bool, int) {
		w := httptest.NewRecorder()
		c, _ := gin.CreateTestContext(w)
		c.Request = httptest.NewRequest(method, "/products", nil)
		c.Set(CtxShopID, shopID)
		c.Set(CtxLicenseExpiresAt, &tokenFuture)
		LicenseGuard(db)(c)
		return c.IsAborted(), w.Code
	}

	// #6 主动停用：未过期但 is_active=0 → 即便 token 说 normal，写/读都应被锁定。
	// 注意 GORM bool 零值陷阱：Create 时 IsActive:false 会被列默认值 1 覆盖，
	// 生产中停用也总是经 Update 落地，故这里同样建后再 Update。
	future := now.Add(10 * 24 * time.Hour)
	InvalidateLicensePhase(2001)
	lic2001 := model.License{ShopID: 2001, IsActive: true, ExpiresAt: &future}
	assert.NoError(t, db.Create(&lic2001).Error)
	assert.NoError(t, db.Model(&model.License{}).Where("id = ?", lic2001.ID).Update("is_active", false).Error)
	aborted, code := invoke(2001, http.MethodGet)
	assert.True(t, aborted, "被停用授权应锁定（连 GET 也拦）")
	assert.Equal(t, http.StatusForbidden, code)

	// #6 从未配置授权：无任何 license 行 → 回退 token 快照（normal）→ 放行，避免误锁。
	InvalidateLicensePhase(2002)
	aborted, _ = invoke(2002, http.MethodPost)
	assert.False(t, aborted, "未配置授权的门店应回退 token 快照放行")

	// #5 缓存失效：先有有效授权（缓存为 normal 放行），再停用并 Invalidate → 立即锁定。
	InvalidateLicensePhase(2003)
	lic := model.License{ShopID: 2003, IsActive: true, ExpiresAt: &future}
	assert.NoError(t, db.Create(&lic).Error)
	aborted, _ = invoke(2003, http.MethodPost) // 写入缓存 normal
	assert.False(t, aborted, "有效授权应放行写操作")

	assert.NoError(t, db.Model(&model.License{}).Where("id = ?", lic.ID).Update("is_active", false).Error)
	// 不失效缓存：30s 内仍按旧 normal 放行
	aborted, _ = invoke(2003, http.MethodPost)
	assert.False(t, aborted, "未失效缓存时停用应仍受 30s 缓存保护")
	// 失效缓存后：重新查库 → 锁定即时生效
	InvalidateLicensePhase(2003)
	aborted, code = invoke(2003, http.MethodPost)
	assert.True(t, aborted, "Invalidate 后停用应即时生效")
	assert.Equal(t, http.StatusForbidden, code)
}