/**
 * @module mapper
 */
import { v4 as uuidv4 } from 'uuid';
import { hasSortKey } from '../decorator/metadata/metadata';
import { metadataForModel } from '../decorator/metadata/metadata-for-model.function';
import { hasType } from '../decorator/metadata/property-metadata.model';
import { BooleanMapper } from './for-type/boolean.mapper';
import { CollectionMapper } from './for-type/collection.mapper';
import { NullMapper } from './for-type/null.mapper';
import { NumberMapper } from './for-type/number.mapper';
import { ObjectMapper } from './for-type/object.mapper';
import { StringMapper } from './for-type/string.mapper';
import { Binary } from './type/binary.type';
import { NullType } from './type/null.type';
import { UndefinedType } from './type/undefined.type';
import { getPropertyPath, typeOf, typeOfFromDb } from './util';
/**
 * @hidden
 */
const mapperForType = new Map();
/**
 * mapps an item according to given model constructor [its meta data] to attributes
 */
export function toDb(item, modelConstructor) {
    const mapped = {};
    if (modelConstructor) {
        const metadata = metadataForModel(modelConstructor);
        /*
         * initialize possible properties with auto generated uuid
         */
        if (metadata) {
            metadata.getKeysWithUUID().forEach(propertyMetadata => {
                if (!Reflect.get(item, propertyMetadata.name)) {
                    Reflect.set(item, propertyMetadata.name, uuidv4());
                }
            });
        }
    }
    const propertyNames = Object.getOwnPropertyNames(item) || [];
    propertyNames.forEach(propertyKey => {
        /*
         * 1) get the value of the property
         */
        const propertyValue = getPropertyValue(item, propertyKey);
        let attributeValue;
        if (propertyValue === undefined || propertyValue === null) {
            // noop ignore because we can't map it
        }
        else {
            /*
             * 2) decide how to map the property depending on type or value
             */
            let propertyMetadata;
            if (modelConstructor) {
                propertyMetadata = metadataForModel(modelConstructor).forProperty(propertyKey);
            }
            if (propertyMetadata) {
                if (propertyMetadata.transient) {
                    // 3a_1) skip transient property
                }
                else {
                    // 3a_2) property metadata is defined and property is not marked not transient
                    attributeValue = toDbOne(propertyValue, getPropertyPath(modelConstructor, propertyKey), propertyMetadata);
                }
            }
            else {
                // 3b) no metadata found
                attributeValue = toDbOne(propertyValue, getPropertyPath(modelConstructor, propertyKey));
            }
            if (attributeValue === undefined) {
                // no-op transient field, just ignore it
            }
            else if (attributeValue === null) {
                // empty values will be ignored too
            }
            else {
                ;
                mapped[propertyMetadata ? propertyMetadata.nameDb : propertyKey] = attributeValue;
            }
        }
    });
    return mapped;
}
export function toDbOne(propertyValue, propertyPathOrMetadata, propertyMetadata) {
    const propertyPath = propertyPathOrMetadata && typeof propertyPathOrMetadata === 'string' ? propertyPathOrMetadata : null;
    propertyMetadata = propertyPathOrMetadata && typeof propertyPathOrMetadata !== 'string' ? propertyPathOrMetadata : propertyMetadata;
    const explicitType = hasType(propertyMetadata)
        ? propertyMetadata.typeInfo.type
        : null;
    const type = explicitType || typeOf(propertyValue, propertyPath);
    const mapper = propertyMetadata && propertyMetadata.mapper ? propertyMetadata.mapper() : forType(type);
    const attrValue = explicitType
        ? mapper.toDb(propertyValue, propertyMetadata)
        : mapper.toDb(propertyValue);
    // some basic validation
    if (propertyMetadata && propertyMetadata.key) {
        if (attrValue === null) {
            throw new Error(`${propertyMetadata.name.toString()} is null but is a ${propertyMetadata.key.type} key`);
        }
        if (!('S' in attrValue) && !('N' in attrValue) && !('B' in attrValue)) {
            throw new Error(`\
DynamoDb only allows string, number or binary type for RANGE and HASH key. \
Make sure to define a custom mapper for '${propertyMetadata.name.toString()}' which returns a string, number or binary value for partition key, \
type ${type} cannot be used as partition key, value = ${JSON.stringify(propertyValue)}`);
        }
    }
    return attrValue;
}
/**
 * @hidden
 */
function testForKey(p) {
    return !!p.key;
}
/**
 * returns the function for the given ModelConstructor to create the AttributeMap with HASH (and RANGE) Key of a given item.
 * @param modelConstructor
 */
export function createToKeyFn(modelConstructor) {
    const metadata = metadataForModel(modelConstructor);
    const properties = metadata.modelOptions.properties;
    if (!properties) {
        throw new Error('metadata properties is not defined');
    }
    const keyProperties = properties.filter(testForKey);
    return (item) => keyProperties.reduce((key, propMeta) => {
        if (item[propMeta.name] === null || item[propMeta.name] === undefined) {
            throw new Error(`there is no value for property ${propMeta.name.toString()} but is ${propMeta.key.type} key`);
        }
        const propertyValue = getPropertyValue(item, propMeta.name);
        key[propMeta.name] = toDbOne(propertyValue, propMeta);
        return key;
    }, {});
}
/**
 * creates toKeyFn and applies item to it.
 * @see {@link createToKeyFn}
 */
export function toKey(item, modelConstructor) {
    return createToKeyFn(modelConstructor)(item);
}
/**
 * @hidden
 */
export function createKeyAttributes(metadata, partitionKey, sortKey) {
    const partitionKeyProp = metadata.getPartitionKey();
    const keyAttributeMap = {
        [partitionKeyProp]: toDbOne(partitionKey, metadata.forProperty(partitionKeyProp)),
    };
    if (hasSortKey(metadata)) {
        if (sortKey === null || sortKey === undefined) {
            throw new Error(`please provide the sort key for attribute ${metadata.getSortKey()}`);
        }
        const sortKeyProp = metadata.getSortKey();
        keyAttributeMap[sortKeyProp] = toDbOne(sortKey, metadata.forProperty(sortKeyProp));
    }
    return keyAttributeMap;
}
/**
 * parses attributes to a js item according to the given model constructor [its meta data]
 */
export function fromDb(attributeMap, modelConstructor) {
    const model = {};
    Object.getOwnPropertyNames(attributeMap).forEach(attributeName => {
        /*
         * 1) get the value of the property
         */
        const attributeValue = attributeMap[attributeName];
        /*
         * 2) decide how to map the property depending on type or value
         */
        let modelValue;
        let propertyMetadata;
        if (modelConstructor) {
            propertyMetadata = metadataForModel(modelConstructor).forProperty(attributeName);
        }
        if (propertyMetadata) {
            if (propertyMetadata.transient) {
                // skip transient property
            }
            else {
                /*
                 * 3a) property metadata is defined
                 */
                if (propertyMetadata && propertyMetadata.mapper) {
                    // custom mapper
                    modelValue = propertyMetadata.mapper().fromDb(attributeValue, propertyMetadata);
                }
                else {
                    modelValue = fromDbOne(attributeValue, propertyMetadata);
                }
            }
        }
        else {
            modelValue = fromDbOne(attributeValue);
        }
        if (modelValue !== null && modelValue !== undefined) {
            Reflect.set(model, propertyMetadata ? propertyMetadata.name : attributeName, modelValue);
        }
    });
    return model;
}
/**
 * parses an attribute to a js value according to the given property metadata
 */
export function fromDbOne(attributeValue, propertyMetadata) {
    const explicitType = hasType(propertyMetadata) ? propertyMetadata.typeInfo.type : null;
    const type = explicitType || typeOfFromDb(attributeValue);
    if (explicitType) {
        return forType(type).fromDb(attributeValue, propertyMetadata);
    }
    else {
        return forType(type).fromDb(attributeValue);
    }
}
/**
 * @hidden
 */
export function forType(type) {
    let mapper = mapperForType.get(type);
    if (!mapper) {
        switch (type) {
            case String:
                mapper = StringMapper;
                break;
            case Number:
                mapper = NumberMapper;
                break;
            case Boolean:
                mapper = BooleanMapper;
                break;
            case Map:
                // Maps support complex types as keys, we only support String & Number as Keys, otherwise a .toString() method should be implemented,
                // so we now how to save a  key
                // mapperForType = new MapMapper()
                throw new Error('Map is not supported to be mapped for now');
            case Array:
                mapper = CollectionMapper;
                break;
            case Set:
                mapper = CollectionMapper;
                break;
            case NullType:
                mapper = NullMapper;
                break;
            case Binary:
                throw new Error('no mapper for binary type implemented yet');
            case UndefinedType:
                mapper = ObjectMapper;
                break;
            case Object:
            default:
                // return ObjectMapper as default to support nested @Model decorated classes (nested complex classes)
                // just note that the property still needs @Property decoration to get the metadata of the complex type
                mapper = ObjectMapper;
        }
        mapperForType.set(type, mapper);
    }
    return mapper;
}
/**
 * @hidden
 */
export function getPropertyValue(item, propertyKey) {
    const propertyDescriptor = Object.getOwnPropertyDescriptor(item, propertyKey);
    // use get accessor if available otherwise use value property of descriptor
    if (propertyDescriptor) {
        if (propertyDescriptor.get) {
            return propertyDescriptor.get();
        }
        else {
            return propertyDescriptor.value;
        }
    }
    else {
        throw new Error(`there is no property descriptor for item ${JSON.stringify(item)} and property key ${propertyKey}`);
    }
}
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