/**
 * Environment Detection and Runtime Capabilities
 *
 * Provides comprehensive environment detection for:
 * - Browser vs Node.js vs other runtimes
 * - Feature availability detection
 * - Platform-specific capability testing
 * - Runtime version information
 */

/**
 * Test if running in browser environment
 * @returns {boolean} True if in browser
 */
function isBrowser() {
  return (
    typeof window !== "undefined" && (!isNodeEnv() || isElectronRenderer())
  );
}

/**
 * Test if running in Electron renderer process
 * @returns {boolean} True if in Electron renderer
 */
function isElectronRenderer() {
  const global = getGlobalObject();
  return global.process !== undefined && global.process.type === "renderer";
}

/**
 * Test if running in Node.js environment
 * @returns {boolean} True if in Node.js
 */
function isNodeEnv() {
  return (
    !isBrowserBundle() &&
    Object.prototype.toString.call(
      typeof process !== "undefined" ? process : 0,
    ) === "[object process]"
  );
}

/**
 * Test if code is running as a browser bundle
 * @returns {boolean} True if browser bundle
 */
function isBrowserBundle() {
  return (
    typeof __SENTRY_BROWSER_BUNDLE__ !== "undefined" &&
    !!__SENTRY_BROWSER_BUNDLE__
  );
}

/**
 * Get SDK source information
 * @returns {string} SDK source identifier
 */
function getSDKSource() {
  return "npm";
}

/**
 * Dynamic module requiring for Node.js
 * @param {Object} moduleObject - Module object (usually module)
 * @param {string} moduleName - Name of module to require
 * @returns {any} Required module
 */
function dynamicRequire(moduleObject, moduleName) {
  return moduleObject.require(moduleName);
}

/**
 * Load a module with multiple fallback strategies
 * @param {string} moduleName - Name of module to load
 * @returns {any} Loaded module or undefined
 */
function loadModule(moduleName) {
  let loadedModule;

  try {
    // Try direct require
    loadedModule = dynamicRequire(module, moduleName);
  } catch (error) {
    // Ignore and try fallback
  }

  try {
    // Try from current working directory
    const { cwd } = dynamicRequire(module, "process");
    loadedModule = dynamicRequire(
      module,
      `${cwd()}/node_modules/${moduleName}`,
    );
  } catch (error) {
    // Module not found
  }

  return loadedModule;
}

/**
 * Detect available JavaScript features
 * @returns {Object} Feature availability map
 */
function detectFeatures() {
  const global = getGlobalObject();

  return {
    // ES6+ Features
    hasPromise: typeof Promise !== "undefined",
    hasWeakSet: typeof WeakSet !== "undefined",
    hasWeakMap: typeof WeakMap !== "undefined",
    hasMap: typeof Map !== "undefined",
    hasSet: typeof Set !== "undefined",
    hasSymbol: typeof Symbol !== "undefined",
    hasProxy: typeof Proxy !== "undefined",
    hasReflect: typeof Reflect !== "undefined",

    // Browser APIs
    hasFetch: typeof fetch !== "undefined",
    hasXMLHttpRequest: typeof XMLHttpRequest !== "undefined",
    hasLocalStorage: typeof localStorage !== "undefined",
    hasSessionStorage: typeof sessionStorage !== "undefined",
    hasIndexedDB: typeof indexedDB !== "undefined",
    hasWebSocket: typeof WebSocket !== "undefined",
    hasWorker: typeof Worker !== "undefined",
    hasServiceWorker: "serviceWorker" in (global.navigator || {}),

    // Crypto APIs
    hasCrypto: typeof crypto !== "undefined",
    hasSubtleCrypto:
      typeof crypto !== "undefined" && typeof crypto.subtle !== "undefined",
    hasGetRandomValues:
      typeof crypto !== "undefined" &&
      typeof crypto.getRandomValues === "function",
    hasRandomUUID:
      typeof crypto !== "undefined" && typeof crypto.randomUUID === "function",

    // Performance APIs
    hasPerformance: typeof performance !== "undefined",
    hasPerformanceNow:
      typeof performance !== "undefined" &&
      typeof performance.now === "function",
    hasPerformanceMark:
      typeof performance !== "undefined" &&
      typeof performance.mark === "function",
    hasPerformanceObserver: typeof PerformanceObserver !== "undefined",
    hasRequestAnimationFrame: typeof requestAnimationFrame !== "undefined",
    hasRequestIdleCallback: typeof requestIdleCallback !== "undefined",

    // Error Handling
    hasErrorEvent: (() => {
      try {
        return new ErrorEvent("") instanceof ErrorEvent;
      } catch (e) {
        return false;
      }
    })(),
    hasUnhandledRejection: typeof global.addEventListener === "function",

    // Node.js specific
    hasProcess: typeof process !== "undefined",
    hasBuffer: typeof Buffer !== "undefined",
    hasModule: typeof module !== "undefined",
    hasRequire: typeof require !== "function",

    // Timers
    hasSetTimeout: typeof setTimeout !== "undefined",
    hasSetInterval: typeof setInterval !== "undefined",
    hasSetImmediate: typeof setImmediate !== "undefined",
    hasNextTick:
      typeof process !== "undefined" && typeof process.nextTick === "function",
  };
}

/**
 * Detect runtime environment details
 * @returns {Object} Runtime information
 */
function detectRuntime() {
  const global = getGlobalObject();
  const features = detectFeatures();

  const runtime = {
    name: "unknown",
    version: "unknown",
    platform: "unknown",
  };

  // Node.js detection
  if (isNodeEnv() && global.process) {
    runtime.name = "node";
    runtime.version = global.process.version;
    runtime.platform = global.process.platform;
    runtime.arch = global.process.arch;
    runtime.versions = global.process.versions;
  }

  // Browser detection
  else if (isBrowser()) {
    runtime.name = "browser";

    if (typeof navigator !== "undefined") {
      runtime.userAgent = navigator.userAgent;
      runtime.platform = navigator.platform;
      runtime.language = navigator.language;
      runtime.languages = navigator.languages;
      runtime.cookieEnabled = navigator.cookieEnabled;
      runtime.onLine = navigator.onLine;
    }

    if (typeof window !== "undefined") {
      runtime.location = window.location
        ? {
            href: window.location.href,
            protocol: window.location.protocol,
            host: window.location.host,
          }
        : undefined;
    }
  }

  // Deno detection
  else if (typeof Deno !== "undefined") {
    runtime.name = "deno";
    runtime.version = Deno.version?.deno;
    runtime.platform = Deno.build?.os;
    runtime.arch = Deno.build?.arch;
  }

  // Bun detection
  else if (typeof Bun !== "undefined") {
    runtime.name = "bun";
    runtime.version = Bun.version;
  }

  // Web Worker detection
  else if (typeof self !== "undefined" && typeof window === "undefined") {
    runtime.name = "webworker";

    if (typeof navigator !== "undefined") {
      runtime.userAgent = navigator.userAgent;
    }
  }

  return { ...runtime, features };
}

/**
 * Test for specific capabilities
 * @param {string} capability - Capability to test
 * @returns {boolean} True if capability is available
 */
function hasCapability(capability) {
  const capabilities = {
    // Network
    fetch: () => typeof fetch === "function",
    xhr: () => typeof XMLHttpRequest === "function",

    // Storage
    localStorage: () => {
      try {
        return typeof localStorage !== "undefined" && localStorage !== null;
      } catch (e) {
        return false;
      }
    },

    sessionStorage: () => {
      try {
        return typeof sessionStorage !== "undefined" && sessionStorage !== null;
      } catch (e) {
        return false;
      }
    },

    // Crypto
    crypto: () => {
      try {
        return typeof crypto !== "undefined" && crypto !== null;
      } catch (e) {
        return false;
      }
    },

    // Performance
    performance: () => {
      try {
        return (
          typeof performance !== "undefined" &&
          typeof performance.now === "function"
        );
      } catch (e) {
        return false;
      }
    },

    // History API
    history: () => {
      const global = getGlobalObject();
      const chrome = global.chrome;
      const isChromeExtension = chrome && chrome.app && chrome.app.runtime;
      const hasHistory =
        "history" in global &&
        !!global.history.pushState &&
        !!global.history.replaceState;

      return !isChromeExtension && hasHistory;
    },
  };

  const test = capabilities[capability];
  return test ? test() : false;
}

/**
 * Get performance timing information
 * @returns {Object} Performance timing data
 */
function getPerformanceInfo() {
  if (!hasCapability("performance")) {
    return null;
  }

  const perf = performance;
  const info = {
    now: perf.now(),
    timeOrigin: perf.timeOrigin,
  };

  // Add navigation timing if available (browser only)
  if (perf.timing) {
    info.navigation = {
      loadStart: perf.timing.loadEventStart,
      domReady: perf.timing.domContentLoadedEventEnd,
      loadComplete: perf.timing.loadEventEnd,
    };
  }

  // Add memory info if available
  if (perf.memory) {
    info.memory = {
      usedJSHeapSize: perf.memory.usedJSHeapSize,
      totalJSHeapSize: perf.memory.totalJSHeapSize,
      jsHeapSizeLimit: perf.memory.jsHeapSizeLimit,
    };
  }

  return info;
}

/**
 * Get global object reference
 * @returns {Object} Global object
 */
function getGlobalObject() {
  return (
    (typeof globalThis === "object" && globalThis) ||
    (typeof window === "object" && window) ||
    (typeof self === "object" && self) ||
    (typeof global === "object" && global) ||
    (function () {
      return this;
    })() ||
    {}
  );
}

module.exports = {
  isBrowser,
  isNodeEnv,
  isBrowserBundle,
  isElectronRenderer,
  getSDKSource,
  dynamicRequire,
  loadModule,
  detectFeatures,
  detectRuntime,
  hasCapability,
  getPerformanceInfo,
  getGlobalObject,
};