import Foundation
import UIKit
import XuqmCoreSDK
import XuqmWebViewSDK
import XuqmBugCollectSDK

/// H5 本地存储的 UserDefaults suite 文件名，与 Update SDK 隔离
private let H5StorageSuite = "szyx_h5_storage"

/// H5 能感知的最高 App API 版本
private let APP_API_VERSION = 4

// MARK: - Message Dispatcher

@MainActor
func handleWebMessage(
    data: String,
    onStatusBarColorChanged: ((UIColor) -> Void)? = nil,
    onNavBarChanged: ((String, UIColor?, UIColor?, [UIColor]?, Float, String?) -> Void)? = nil,
    onCheckUpdateRequested: (() -> Void)? = nil,
    onOrientationChanged: ((String) -> Void)? = nil
) {
    do {
        guard let jsonData = data.data(using: .utf8),
              let json = try JSONSerialization.jsonObject(with: jsonData) as? [String: Any] else { return }

        let model = json["model"] as? String ?? ""
        let functionId = json["functionId"] as? String ?? ""

        switch model {
        case "setTitle":
            handleSetTitle(json: json, functionId: functionId,
                           onStatusBarColorChanged: onStatusBarColorChanged,
                           onNavBarChanged: onNavBarChanged)

        case "isWechatInstalled":
            // WeChat is never installed on iOS (App Store policy)
            respondToWeb(functionId: functionId, model: model, status: "0",
                         message: "isWechatInstalled:ok",
                         value: ["isWechatInstalled": false])

        case "wechatPay":
            // WeChat Pay is not supported in this build
            respondToWeb(functionId: functionId, model: model,
                         status: "E50001", message: "当前App不支持微信支付")

        case "getDeviceInfo":
            let device = UIDevice.current
            let deviceInfo: [String: Any] = [
                "osName": "iOS",
                "osVersion": "iOS \(device.systemVersion)",
                "baseVersion": device.systemVersion,
                "brand": "Apple",
                "manufacturer": "Apple",
                "model": device.model,
                "marketName": device.name,
                "deviceId": device.identifierForVendor?.uuidString ?? "",
            ]
            respondToWeb(functionId: functionId, model: model, status: "0",
                         message: "getDeviceInfo:ok", value: ["deviceInfo": deviceInfo])

        case "login":
            let userId = json["userId"] as? String ?? ""
            if !userId.isEmpty {
                let userSig = (json["userSig"] as? String)?.nonEmpty
                let name = (json["name"] as? String)?.nonEmpty
                let avatar = (json["avatar"] as? String)?.nonEmpty
                XuqmSDK.shared.setUserInfo(userId: userId, nickname: name, avatar: avatar)
                if let userSig {
                    Task { await XuqmSDK.shared.login(userId: userId, userSig: userSig) }
                }
                BugCollectSDK.shared.addBreadcrumb(category: "auth", message: "login userId=\(userId)")
            }
            respondOk(functionId: functionId, model: model, message: "login:ok")

        case "setUserInfo":
            let userId = ((json["userId"] as? String)?.nonEmpty ?? (json["id"] as? String)?.nonEmpty) ?? ""
            if !userId.isEmpty {
                let userSig = (json["userSig"] as? String)?.nonEmpty
                let name = (json["name"] as? String)?.nonEmpty
                let avatar = (json["avatar"] as? String)?.nonEmpty
                XuqmSDK.shared.setUserInfo(userId: userId, nickname: name, avatar: avatar)
                if let userSig {
                    Task { await XuqmSDK.shared.login(userId: userId, userSig: userSig) }
                }
            }
            respondOk(functionId: functionId, model: model, message: "setUserInfo:ok")

        case "getAppVersion":
            let versionName = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "1.0.0"
            respondToWeb(functionId: functionId, model: model, status: "0",
                         message: "getAppVersion:ok",
                         value: ["version": APP_API_VERSION, "appVersion": versionName])

        case "checkUpdate":
            onCheckUpdateRequested?()
            respondOk(functionId: functionId, model: model, message: "checkUpdate:ok")

        case "setStorage":
            let storage = json["storage"] as? [String: Any]
            let key = (storage?["key"] as? String) ?? ""
            let value = (storage?["value"] as? String) ?? ""
            if !key.isEmpty {
                let defaults = UserDefaults(suiteName: H5StorageSuite)
                defaults?.set(value, forKey: key)
            }
            respondOk(functionId: functionId, model: model, message: "setStorage:ok")

        case "getStorage":
            let storage = json["storage"] as? [String: Any]
            let key = (storage?["key"] as? String) ?? ""
            let defaultValue = (storage?["defaultValue"] as? String) ?? ""
            let stored: String
            if !key.isEmpty, let v = UserDefaults(suiteName: H5StorageSuite)?.string(forKey: key) {
                stored = v
            } else {
                stored = defaultValue
            }
            respondToWeb(functionId: functionId, model: model, status: "0",
                         message: "getStorage:ok",
                         value: ["storage": ["key": key, "value": stored]])

        case "removeStorage":
            let key = (json["storage"] as? [String: Any])?["key"] as? String ?? ""
            if !key.isEmpty { UserDefaults(suiteName: H5StorageSuite)?.removeObject(forKey: key) }
            respondOk(functionId: functionId, model: model, message: "removeStorage:ok")

        case "clearStorage":
            if let d = UserDefaults(suiteName: H5StorageSuite) {
                d.dictionaryRepresentation().keys.forEach { d.removeObject(forKey: $0) }
            }
            respondOk(functionId: functionId, model: model, message: "clearStorage:ok")

        case "setOrientation":
            let orientation = json["orientation"] as? String ?? ""
            onOrientationChanged?(orientation)
            respondOk(functionId: functionId, model: model, message: "setOrientation:ok")

        case "apiError":
            let d = (json["data"] as? [String: Any]) ?? json
            let url = d["url"] as? String ?? ""
            let method = d["method"] as? String ?? ""
            let status = d["status"] as? Int ?? 0
            let statusText = d["statusText"] as? String ?? ""
            let body = d["response"] as? String ?? ""
            BugCollectSDK.shared.captureError(
                ApiCallError(method: method, url: url, status: status, statusText: statusText, body: body),
                tags: ["context": "webViewApi", "url": url, "method": method, "status": status]
            )

        default:
            respondToWeb(functionId: functionId, model: model,
                         status: "E40001", message: "当前App版本不支持该接口")
        }
    } catch {
        BugCollectSDK.shared.captureError(error, tags: ["context": "handleWebMessage"])
    }
}

// MARK: - setTitle helpers

private func handleSetTitle(
    json: [String: Any],
    functionId: String,
    onStatusBarColorChanged: ((UIColor) -> Void)?,
    onNavBarChanged: ((String, UIColor?, UIColor?, [UIColor]?, Float, String?) -> Void)?
) {
    let titleObj = json["title"] as? [String: Any]
    let titleText = titleObj?["titleText"] as? String ?? ""
    let textColor = parseHexColor(titleObj?["titleTextColor"] as? String)
    let bgImage = (titleObj?["titleBackgroundImage"] as? String)?.nonEmpty

    let gradientArr = titleObj?["titleBackgroundGradient"] as? [String]
    let bgGradient: [UIColor]?
    let bgColor: UIColor?
    if let gradientArr, gradientArr.count >= 2 {
        bgGradient = gradientArr.compactMap { parseHexColor($0) }
        bgColor = bgGradient?.first
    } else {
        bgGradient = nil
        bgColor = parseHexColor(titleObj?["titleBackgroundColor"] as? String)
    }
    let gradientAngle = (titleObj?["titleBackgroundGradientAngle"] as? Double).map { Float($0) } ?? 0

    if let bgColor { onStatusBarColorChanged?(bgColor) }
    onNavBarChanged?(titleText, textColor, bgColor, bgGradient, gradientAngle, bgImage)
    respondOk(functionId: functionId, model: "setTitle", message: "setTitle:ok")
}

// MARK: - Response helpers

private func respondOk(functionId: String, model: String, message: String) {
    respondToWeb(functionId: functionId, model: model, status: "0", message: message, value: [:])
}

private func respondToWeb(
    functionId: String,
    model: String,
    status: String = "0",
    message: String,
    value: [String: Any] = [:]
) {
    var response: [String: Any] = [
        "functionId": functionId,
        "model": model,
        "status": status,
        "message": message,
        "value": value,
    ]
    guard let data = try? JSONSerialization.data(withJSONObject: response),
          let json = String(data: data, encoding: .utf8) else { return }

    let js = "(function(){window.SZYX_YWX_WebViewBridge&&window.SZYX_YWX_WebViewBridge.onMessage(\(json));})()"
    postJSToWebView(js)
}

// MARK: - Color helpers

func parseHexColor(_ hex: String?) -> UIColor? {
    guard var h = hex?.trimmingCharacters(in: .whitespaces), !h.isEmpty else { return nil }
    if h.hasPrefix("#") { h = String(h.dropFirst()) }
    guard h.count == 6 || h.count == 8 else { return nil }
    var value: UInt64 = 0
    Scanner(string: h).scanHexInt64(&value)
    if h.count == 6 {
        return UIColor(
            red:   CGFloat((value >> 16) & 0xFF) / 255,
            green: CGFloat((value >>  8) & 0xFF) / 255,
            blue:  CGFloat( value        & 0xFF) / 255,
            alpha: 1
        )
    } else {
        return UIColor(
            red:   CGFloat((value >> 24) & 0xFF) / 255,
            green: CGFloat((value >> 16) & 0xFF) / 255,
            blue:  CGFloat((value >>  8) & 0xFF) / 255,
            alpha: CGFloat( value        & 0xFF) / 255
        )
    }
}

func isLightColor(_ color: UIColor) -> Bool {
    var r: CGFloat = 0, g: CGFloat = 0, b: CGFloat = 0
    color.getRed(&r, green: &g, blue: &b, alpha: nil)
    return 0.299 * r + 0.587 * g + 0.114 * b > 0.5
}

// MARK: - JS posting

func postJSToWebView(_ js: String) {
    // Forward via XWebViewBridge to the active WKWebView
    Task { @MainActor in
        XWebViewBridge.shared.postMessageToWeb(js)
    }
}

// MARK: - Supporting types

private struct ApiCallError: Error {
    let method: String
    let url: String
    let status: Int
    let statusText: String
    let body: String
    var localizedDescription: String { "API \(method) \(url) → \(status) \(statusText)" }
}

private extension String {
    var nonEmpty: String? { isEmpty ? nil : self }
}