//v9
document.addEventListener('DOMContentLoaded', () => {
  const canvas = document.getElementById('unity-canvas');
  if (!canvas) {
    console.error("Canvas element with id='unity-canvas' not found!");
    return;
  }

  // Track lock state
  window.isPointerLocked = false;

  // Track if unadjustedMovement is supported (assume yes until proven otherwise)
  let unadjustedMovementSupported = true;

  // Utility: Check if pointer lock API is available
  function hasPointerLockAPI() {
    return !!(canvas.requestPointerLock ||
      canvas.webkitRequestPointerLock ||
      canvas.mozRequestPointerLock);
  }

  // Safari detection
  function isSafari() {
    // This UA check excludes Chrome on iOS
    return /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
  }

  // Called when pointer lock state changes
  function onPointerLockChange() {
    const doc = document;
    const locked = (
      doc.pointerLockElement === canvas ||
      doc.webkitPointerLockElement === canvas ||
      doc.mozPointerLockElement === canvas
    );
    window.isPointerLocked = locked;

    if (locked) {
      console.log("----cursor locking----");
      canvas.style.cursor = "none";
    } else {
      console.log("----cursor unlocking----");
      canvas.style.cursor = "default";
    }

    sendLockStateToUnity(locked);
  }

  // Called when pointer lock errors out
  function onPointerLockError(event) {
    console.error("----pointer lock error----", event);
    sendLockStateToUnity(false);
    // For macOS Safari: add a one-time mousedown fallback if pointer isn't locked.
    if (isSafari() && !window.isPointerLocked) {
      console.log("----Safari fallback: adding one-time mousedown listener for pointer lock----");
      addOneTimeMouseDownListener();
    }
  }

  // Helper to add a one-time mousedown listener for fallback pointer lock
  function addOneTimeMouseDownListener() {
    // Use a named function so we can remove it if needed
    function fallbackMouseDown(e) {
      console.log("----Fallback mousedown triggered, retrying pointer lock----");
      canvas.removeEventListener('mousedown', fallbackMouseDown);
      lockPointerNow();
    }
    canvas.addEventListener('mousedown', fallbackMouseDown, false);
  }

  // Listen for pointer lock changes/errors (all vendor prefixes)
  document.addEventListener('pointerlockchange', onPointerLockChange, false);
  document.addEventListener('webkitpointerlockchange', onPointerLockChange, false);
  document.addEventListener('mozpointerlockchange', onPointerLockChange, false);

  document.addEventListener('pointerlockerror', onPointerLockError, false);
  document.addEventListener('webkitpointerlockerror', onPointerLockError, false);
  document.addEventListener('mozpointerlockerror', onPointerLockError, false);

  // Send pointer lock state back to Unity
  function sendLockStateToUnity(isLocked) {
    if (typeof unityInstance !== 'undefined' && unityInstance && unityInstance.SendMessage) {
      try {
        unityInstance.SendMessage('CursorController', 'OnLockChange', isLocked ? 'true' : 'false');
      } catch (e) {
        console.warn("----Failed to send lock state to Unity----", e);
      }
    }
  }

  // Request pointer lock without options (basic fallback)
  function requestPointerLockBasic() {
    if (canvas.requestPointerLock) {
      canvas.requestPointerLock();
    } else if (canvas.webkitRequestPointerLock) {
      canvas.webkitRequestPointerLock();
    } else if (canvas.mozRequestPointerLock) {
      canvas.mozRequestPointerLock();
    }
  }

  // Request pointer lock with unadjustedMovement option
  async function requestPointerLockWithOptions() {
    if (canvas.requestPointerLock) {
      return canvas.requestPointerLock({ unadjustedMovement: true });
    } else if (canvas.webkitRequestPointerLock) {
      return canvas.webkitRequestPointerLock({ unadjustedMovement: true });
    } else if (canvas.mozRequestPointerLock) {
      return canvas.mozRequestPointerLock({ unadjustedMovement: true });
    }
  }

  // Attempt to lock pointer
  async function lockPointerNow() {
    console.log("----attempting pointer lock----");

    if (!hasPointerLockAPI()) {
      console.warn("----Pointer lock API not supported in this browser----");
      sendLockStateToUnity(false);
      return;
    }

    // If Safari, skip the options param entirely
    if (isSafari()) {
      console.log("----Safari detected; skipping unadjustedMovement param----");
      try {
        requestPointerLockBasic();
      } catch (err) {
        console.error("----Safari pointer lock request failed----", err);
        sendLockStateToUnity(false);
      }
      return;
    }

    // Non-Safari browsers
    // Check permissions if available (non-blocking, just for logging)
    if (navigator.permissions && navigator.permissions.query) {
      try {
        const permStatus = await navigator.permissions.query({ name: 'pointer-lock' });
        console.log("----pointer lock permission state: " + permStatus.state + "----");
      } catch (permError) {
        // Permissions API may not support pointer-lock query - that's fine
        console.log("----Permissions API query not supported for pointer-lock----");
      }
    }

    // Try with unadjustedMovement if supported, otherwise use basic request
    if (unadjustedMovementSupported) {
      try {
        await requestPointerLockWithOptions();
        console.log("----pointer lock request initiated with unadjustedMovement----");
      } catch (err) {
        // Check if error is due to unadjustedMovement not being supported
        if (err && (err.name === 'NotSupportedError' || err.name === 'TypeError')) {
          console.warn("----unadjustedMovement not supported, falling back to basic pointer lock----");
          unadjustedMovementSupported = false;
          // Retry immediately with basic request
          try {
            requestPointerLockBasic();
            console.log("----pointer lock request initiated (basic fallback)----");
          } catch (fallbackErr) {
            console.error("----pointer lock request failed (basic fallback)----", fallbackErr);
            sendLockStateToUnity(false);
          }
        } else {
          console.error("----pointer lock request failed (non-Safari)----", err);
          sendLockStateToUnity(false);
        }
      }
    } else {
      // We already know unadjustedMovement isn't supported, use basic request
      try {
        requestPointerLockBasic();
        console.log("----pointer lock request initiated (basic, cached)----");
      } catch (err) {
        console.error("----pointer lock request failed (basic)----", err);
        sendLockStateToUnity(false);
      }
    }
  }

  // Attempt to unlock pointer
  function unlockPointerNow() {
    console.log("----attempting pointer unlock----");
    const doc = document;
    if (doc.pointerLockElement === canvas ||
      doc.webkitPointerLockElement === canvas ||
      doc.mozpointerLockElement === canvas) {
      if (doc.exitPointerLock) {
        doc.exitPointerLock();
      } else if (doc.webkitExitPointerLock) {
        doc.webkitExitPointerLock();
      } else if (doc.mozExitPointerLock) {
        doc.mozExitPointerLock();
      }
      console.log("----pointer unlock request sent----");
    } else {
      console.warn("----pointer is not locked to the canvas----");
      sendLockStateToUnity(false);
    }
  }

  // Expose lock/unlock globally for Unity ExternalCall usage
  window.lockPointerNow = lockPointerNow;
  window.unlockPointerNow = unlockPointerNow;

  // Expose a function to change cursor style
  window.setCursor = function setCursor(cursorStyle) {
    if (canvas) {
      canvas.style.cursor = cursorStyle;
    }
  };
});