import references = require('references');
import _ = require('lodash');
import Types = require('tsd-schema');
export = isAssignableTo;


function isAssignableTo(value: any, type: any) {
    var schema = <Types.Schema> this;

    //TODO: handle a few special cases...
    if (typeof type === 'string') {
        switch (type) {
            case 'any':     return true;
            case 'string':  return value === null || typeof value === 'string';
            case 'number':  return value === null || typeof value === 'number';
            default:        return schema[type] && schema.isAssignableTo(value, schema[type]);
        }
    }

    //TODO: assume type is an interface for now.... Generalise this.
    var optional = type['@optional'] || {};
    for (var propName in type) {
        if (!type.hasOwnProperty(propName)) continue;

        //TODO: ignore @blah props for now - but come back to these...
        if (propName.indexOf('@') === 0) continue;

        // Ignore optional members.
        if (optional[propName]) continue;

        // Get required member value.
        if (!(propName in value)) return false;

        // Recursively ensure assignability of member value.
        if (!schema.isAssignableTo(value[propName], type[propName])) return false;
    }

    // If we get to here, consider the value to be assignable to the type.
    return true;
}