package browserfp

import (
	"math/rand"
	"strings"
	"time"
)

// ─── Language ──────────────────────────────────────────────────────────────

// Language 浏览器语言条目。
type Language struct {
	Code     string // "en-US"
	JoinList string // "en-US,en"
}

// Slice 返回 [][]string 的 []string 形式。
func (l Language) Slice() []string { return strings.Split(l.JoinList, ",") }

// LanguageJoin 返回 code 对应的 languagesJoin 字符串。
func LanguageJoin(code string) string {
	for _, l := range Languages {
		if l.Code == code {
			return l.JoinList
		}
	}
	return code + ",en"
}

// LanguageSlices 所有 Language 的 [][]string 形式。
func LanguageSlices() [][]string {
	out := make([][]string, len(Languages))
	for i, l := range Languages {
		out[i] = l.Slice()
	}
	return out
}

// ─── 通用数据池 ──────────────────────────────────────────────────────────

// UserAgents 真实 Chrome UA 池。
var UserAgents = []string{
	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36",
	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.36",
	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36",
	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36",
	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.36",
}

// Languages 浏览器 navigator.languages 组合。
var Languages = []Language{
	{"en-US", "en-US,en"},
	{"zh-CN", "zh-CN,zh"},
	{"en-GB", "en-GB,en"},
	{"ja", "ja,en"},
	{"de", "de,en"},
	{"fr", "fr,en"},
	{"es", "es,en"},
	{"ko", "ko,en"},
}

// Platforms 浏览器 navigator.platform 值。
var Platforms = []string{"Win32", "Win32", "MacIntel", "Linux x86_64", "Linux armv8l", "Linux i686"}

// DocumentKeys document 上 own-enumerable 属性名池。
var DocumentKeys = []string{
	"_reactListening8in7sfyhjvp", "_reactListeningo743lnnpvdg",
	"_reactContainer$5pyziap1brc", "__reactContainer$b63yiita51i",
	"location", "cookie", "referrer", "currentScript", "body", "head", "documentElement",
}

// WindowKeys window 全局属性名池。
var WindowKeys = []string{
	"onchange", "onclick", "onload", "onerror", "onresize",
	"onmouseover", "onmouseout", "onfocus", "onblur", "onscroll",
	"onkeydown", "onkeyup", "onkeypress",
	"requestIdleCallback", "requestAnimationFrame", "setTimeout",
	"fetch", "console", "Promise", "Map", "Set", "WeakMap", "WeakSet",
	"crypto", "performance", "navigator", "document", "location", "history",
	"localStorage", "sessionStorage", "indexedDB",
	"Image", "XMLHttpRequest", "FormData", "Headers", "Request", "Response",
	"alert", "confirm", "prompt", "close", "focus", "blur",
	"addEventListener", "removeEventListener", "dispatchEvent",
	"scrollTo", "scrollBy", "scroll", "matchMedia", "getComputedStyle",
	"getSelection", "find", "stop", "open", "print", "captureEvents",
	"releaseEvents", "queueMicrotask", "reportError", "structuredClone",
	"isSecureContext", "crossOriginIsolated", "originAgentCluster",
	"speechSynthesis", "MediaSource", "Blob", "File", "FileReader",
	"Atomics", "SharedArrayBuffer", "WebAssembly", "BigInt", "Symbol", "Proxy",
}

// NavigatorProbes "X in navigator" 探测格式。
var NavigatorProbes = []string{
	"windowControlsOverlay−[object WindowControlsOverlay]",
	"geolocation−[object Geolocation]",
	"clipboard−[object Clipboard]",
	"mediaDevices−[object MediaDevices]",
	"permissions−[object Permissions]",
	"bluetooth−[object Bluetooth]",
	"usb−[object USB]",
	"serial−[object Serial]",
	"hid−[object HID]",
	"presentation−[object Presentation]",
	"credentials−[object CredentialsContainer]",
}

// ScriptURLs sentinel SDK 脚本 URL 池。
// 浏览器中 hPt(Array.from(document.scripts).map(e=>e?.src).filter(e=>e))
// 会随机选一个 script URL。
var ScriptURLs = []string{
	"https://chatgpt.com/backend-api/sentinel/sdk.js",
	"https://chatgpt.com/sentinel/20260423af3c/sdk.js",
}

// DefaultBuildID 当前 chatgpt.com 的 data-build 属性。
const DefaultBuildID = "prod-dbbd612ddb47498515c3eecf8579bcafa0066e07"

// VendorForPlatform 返回给定平台的 navigator.vendor 值。
func VendorForPlatform(platform string) string {
	if platform == "MacIntel" {
		return "Apple Computer, Inc."
	}
	return "Google Inc."
}

// ─── Profile ──────────────────────────────────────────────────────────────

// Profile 浏览器指纹配置。
type Profile struct {
	WebGLUnmaskedRenderer string
	WebGLUnmaskedVendor   string
	Language              string
	BuildID               string
	Platform              string
	ScreenWidth           int
	ScreenHeight          int
	ScreenAvailHeight     int
	ScreenColorDepth      int
	HardwareConcurrency   int
	DeviceMemory          int
	JSHeapSizeLimit       int64
	NetworkDownlink       float64
	NetworkRTT            int
	TimezoneOffset        int
	DevicePixelRatio      float64
}

// ─── 全局单例 ──────────────────────────────────────────────────────────────

var current *Profile

// Init 启动时调用一次，生成全局唯一的 Profile。
func Init() { current = Generate(nil) }

// Get 返回全局唯一的 Profile。
func Get() *Profile { return current }

// Generate 从真实数据池中随机生成 Profile。
func Generate(rng *rand.Rand) *Profile {
	if rng == nil {
		rng = rand.New(rand.NewSource(time.Now().UnixNano()))
	}

	lang := Languages[rng.Intn(len(Languages))]
	platform := Platforms[rng.Intn(len(Platforms))]
	sr := screenResolutions[rng.Intn(len(screenResolutions))]
	sw, sh := sr[0]+rng.Intn(101)-50, sr[1]+rng.Intn(101)-50
	if sw < 1024 {
		sw = 1024
	}
	if sh < 600 {
		sh = 600
	}

	vendorIdx := rng.Intn(len(webglUnmaskedVendors))

	return &Profile{
		WebGLUnmaskedVendor:   webglUnmaskedVendors[vendorIdx],
		WebGLUnmaskedRenderer: webglUnmaskedRenderersMap[vendorIdx][rng.Intn(len(webglUnmaskedRenderersMap[vendorIdx]))],

		Language: lang.Code,
		BuildID:  DefaultBuildID,
		Platform: platform,

		ScreenWidth:       sw,
		ScreenHeight:      sh,
		ScreenAvailHeight: sh - (20 + rng.Intn(40)),
		ScreenColorDepth:  24,

		HardwareConcurrency: pickInt(rng, []int{4, 8, 12, 16, 20, 24, 32}),
		DeviceMemory:        pickInt(rng, []int{4, 8, 16, 32}),
		JSHeapSizeLimit:     pickInt64(rng, []int64{2_147_483_648, 4_294_967_296, 8_589_934_592, 17_179_869_184}),

		NetworkDownlink: networkDownlinks[rng.Intn(len(networkDownlinks))],
		NetworkRTT:      networkRTTs[rng.Intn(len(networkRTTs))],

			DevicePixelRatio: devicePixelRatios[rng.Intn(len(devicePixelRatios))],

		TimezoneOffset: (rng.Intn(23) - 12) * 60,
	}
}

// ─── 内部辅助 ──────────────────────────────────────────────────────────────

func pickStr(rng *rand.Rand, opts []string) string { return opts[rng.Intn(len(opts))] }
func pickInt(rng *rand.Rand, opts []int) int        { return opts[rng.Intn(len(opts))] }
func pickInt64(rng *rand.Rand, opts []int64) int64  { return opts[rng.Intn(len(opts))] }