import {
  writable
} from "./chunk-2KTQ372Z.js";
import "./chunk-ACBGUER4.js";
import {
  assign,
  identity,
  loop,
  now
} from "./chunk-RILKTLQD.js";

// node_modules/.pnpm/svelte@3.55.0/node_modules/svelte/motion/index.mjs
function is_date(obj) {
  return Object.prototype.toString.call(obj) === "[object Date]";
}
function tick_spring(ctx, last_value, current_value, target_value) {
  if (typeof current_value === "number" || is_date(current_value)) {
    const delta = target_value - current_value;
    const velocity = (current_value - last_value) / (ctx.dt || 1 / 60);
    const spring2 = ctx.opts.stiffness * delta;
    const damper = ctx.opts.damping * velocity;
    const acceleration = (spring2 - damper) * ctx.inv_mass;
    const d = (velocity + acceleration) * ctx.dt;
    if (Math.abs(d) < ctx.opts.precision && Math.abs(delta) < ctx.opts.precision) {
      return target_value;
    } else {
      ctx.settled = false;
      return is_date(current_value) ? new Date(current_value.getTime() + d) : current_value + d;
    }
  } else if (Array.isArray(current_value)) {
    return current_value.map((_, i) => tick_spring(ctx, last_value[i], current_value[i], target_value[i]));
  } else if (typeof current_value === "object") {
    const next_value = {};
    for (const k in current_value) {
      next_value[k] = tick_spring(ctx, last_value[k], current_value[k], target_value[k]);
    }
    return next_value;
  } else {
    throw new Error(`Cannot spring ${typeof current_value} values`);
  }
}
function spring(value, opts = {}) {
  const store = writable(value);
  const { stiffness = 0.15, damping = 0.8, precision = 0.01 } = opts;
  let last_time;
  let task;
  let current_token;
  let last_value = value;
  let target_value = value;
  let inv_mass = 1;
  let inv_mass_recovery_rate = 0;
  let cancel_task = false;
  function set(new_value, opts2 = {}) {
    target_value = new_value;
    const token = current_token = {};
    if (value == null || opts2.hard || spring2.stiffness >= 1 && spring2.damping >= 1) {
      cancel_task = true;
      last_time = now();
      last_value = new_value;
      store.set(value = target_value);
      return Promise.resolve();
    } else if (opts2.soft) {
      const rate = opts2.soft === true ? 0.5 : +opts2.soft;
      inv_mass_recovery_rate = 1 / (rate * 60);
      inv_mass = 0;
    }
    if (!task) {
      last_time = now();
      cancel_task = false;
      task = loop((now2) => {
        if (cancel_task) {
          cancel_task = false;
          task = null;
          return false;
        }
        inv_mass = Math.min(inv_mass + inv_mass_recovery_rate, 1);
        const ctx = {
          inv_mass,
          opts: spring2,
          settled: true,
          dt: (now2 - last_time) * 60 / 1e3
        };
        const next_value = tick_spring(ctx, last_value, value, target_value);
        last_time = now2;
        last_value = value;
        store.set(value = next_value);
        if (ctx.settled) {
          task = null;
        }
        return !ctx.settled;
      });
    }
    return new Promise((fulfil) => {
      task.promise.then(() => {
        if (token === current_token)
          fulfil();
      });
    });
  }
  const spring2 = {
    set,
    update: (fn, opts2) => set(fn(target_value, value), opts2),
    subscribe: store.subscribe,
    stiffness,
    damping,
    precision
  };
  return spring2;
}
function get_interpolator(a, b) {
  if (a === b || a !== a)
    return () => a;
  const type = typeof a;
  if (type !== typeof b || Array.isArray(a) !== Array.isArray(b)) {
    throw new Error("Cannot interpolate values of different type");
  }
  if (Array.isArray(a)) {
    const arr = b.map((bi, i) => {
      return get_interpolator(a[i], bi);
    });
    return (t) => arr.map((fn) => fn(t));
  }
  if (type === "object") {
    if (!a || !b)
      throw new Error("Object cannot be null");
    if (is_date(a) && is_date(b)) {
      a = a.getTime();
      b = b.getTime();
      const delta = b - a;
      return (t) => new Date(a + t * delta);
    }
    const keys = Object.keys(b);
    const interpolators = {};
    keys.forEach((key) => {
      interpolators[key] = get_interpolator(a[key], b[key]);
    });
    return (t) => {
      const result = {};
      keys.forEach((key) => {
        result[key] = interpolators[key](t);
      });
      return result;
    };
  }
  if (type === "number") {
    const delta = b - a;
    return (t) => a + t * delta;
  }
  throw new Error(`Cannot interpolate ${type} values`);
}
function tweened(value, defaults = {}) {
  const store = writable(value);
  let task;
  let target_value = value;
  function set(new_value, opts) {
    if (value == null) {
      store.set(value = new_value);
      return Promise.resolve();
    }
    target_value = new_value;
    let previous_task = task;
    let started = false;
    let { delay = 0, duration = 400, easing = identity, interpolate = get_interpolator } = assign(assign({}, defaults), opts);
    if (duration === 0) {
      if (previous_task) {
        previous_task.abort();
        previous_task = null;
      }
      store.set(value = target_value);
      return Promise.resolve();
    }
    const start = now() + delay;
    let fn;
    task = loop((now2) => {
      if (now2 < start)
        return true;
      if (!started) {
        fn = interpolate(value, new_value);
        if (typeof duration === "function")
          duration = duration(value, new_value);
        started = true;
      }
      if (previous_task) {
        previous_task.abort();
        previous_task = null;
      }
      const elapsed = now2 - start;
      if (elapsed > duration) {
        store.set(value = new_value);
        return false;
      }
      store.set(value = fn(easing(elapsed / duration)));
      return true;
    });
    return task.promise;
  }
  return {
    set,
    update: (fn, opts) => set(fn(target_value, value), opts),
    subscribe: store.subscribe
  };
}
export {
  spring,
  tweened
};
//# sourceMappingURL=svelte_motion.js.map