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// ============================================================================
// Copyright (c) 2017-2019 Nawapunth Manusitthipol (NawaMan - http://nawaman.net).
// ----------------------------------------------------------------------------
// MIT License
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
// ============================================================================
package functionalj.lens.lenses;

import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.function.Function;

import functionalj.lens.core.AccessUtils;
import functionalj.lens.core.LensSpec;
import functionalj.lens.core.LensUtils;
import functionalj.lens.core.WriteLens;
import functionalj.list.FuncList;
import functionalj.map.FuncMap;
import functionalj.result.Result;
import lombok.val;
import nullablej.nullable.Nullable;

@SuppressWarnings("javadoc")
public class ObjectLensImpl implements ObjectLens {
    
    private LensSpec spec;
    
    public ObjectLensImpl(LensSpec spec) {
        this.spec = spec;
    }
    
    @Override
    public LensSpec lensSpec() {
        return spec;
    }
    
    protected  SUBLENS createSubLens(
            Function                    readSub,
            WriteLens                   writeSub,
            Function, SUBLENS> subLensCreator) {
        return LensUtils.createSubLens(this, readSub, writeSub, subLensCreator);
    }
    
    protected > 
            ListLens createSubListLens(
                Function>                   readSub,
                WriteLens>                  writeSub,
                Function, SUBLENS> subLensCreator) {
        val readThis   = this.lensSpec().getRead();
        val writeThis  = this.lensSpec().getWrite();
        val subRead    = (Function>) LensUtils.createSubRead(readThis,  readSub,             this.lensSpec().getIsNullSafe());
        val subWrite   = (WriteLens>)LensUtils.createSubWrite(readThis, writeThis, writeSub, this.lensSpec().getIsNullSafe());
        val spec       = LensUtils.createLensSpecParameterized(subRead, subWrite, subLensCreator);
        val listLens   = ListLens.of(spec);
        return listLens;
    }
    
    protected > 
            FuncListLens createSubFuncListLens(
                Function>                   readSub,
                WriteLens>                  writeSub,
                Function, SUBLENS> subLensCreator) {
        val readThis   = this.lensSpec().getRead();
        val writeThis  = this.lensSpec().getWrite();
        val subRead    = (Function>) LensUtils.createSubRead(readThis,  readSub,             this.lensSpec().getIsNullSafe());
        val subWrite   = (WriteLens>)LensUtils.createSubWrite(readThis, writeThis, writeSub, this.lensSpec().getIsNullSafe());
        val spec       = LensUtils.createLensSpecParameterized(subRead, subWrite, subLensCreator);
        val listLens   = FuncListLens.of(spec);
        return listLens;
    }
    
    protected > 
            NullableLens createSubNullableLens(
                Function>         readSub,
                WriteLens>         writeSub,
                Function, SUBLENS> subCreator) {
        val readThis   = this.lensSpec().getRead();
        val writeThis  = this.lensSpec().getWrite();
        val subRead    = (Function>) LensUtils.createSubRead(readThis,  readSub,             this.lensSpec().getIsNullSafe());
        val subWrite   = (WriteLens>)LensUtils.createSubWrite(readThis, writeThis, writeSub, this.lensSpec().getIsNullSafe());
        val spec = LensUtils.createLensSpecParameterized(subRead, subWrite, subCreator);
        val lens = (NullableLens)()->spec;
        return lens;
    }
    
    protected > 
            ResultLens         createSubResultLens(
            Function>           readSub,
            WriteLens>           writeSub,
            Function, SUBLENS> subCreator) {
        val readThis   = this.lensSpec().getRead();
        val writeThis  = this.lensSpec().getWrite();
        val subRead    = (Function>) LensUtils.createSubRead(readThis,  readSub,             this.lensSpec().getIsNullSafe());
        val subWrite   = (WriteLens>)LensUtils.createSubWrite(readThis, writeThis, writeSub, this.lensSpec().getIsNullSafe());
        val spec = LensUtils.createLensSpecParameterized(subRead, subWrite, subCreator);
        val lens = (ResultLens)()->spec;
        return lens;
    }
    
    protected > 
            ResultAccess       createSubResultAccess(
            Function>              readSub,
            Function, SUBACCESSS> subCreator) {
        val readThis = this.lensSpec().getRead();
        val subRead  = (Function>) LensUtils.createSubRead(readThis, readSub, this.lensSpec().getIsNullSafe());
        return AccessUtils.createResultAccess(subRead, subCreator);
    }
    
    protected > 
            OptionalLens createSubOptionalLens(
                Function>         readSub,
                WriteLens>         writeSub,
                Function, SUBLENS> subCreator) {
        val readThis   = this.lensSpec().getRead();
        val writeThis  = this.lensSpec().getWrite();
        val subRead    = (Function>) LensUtils.createSubRead(readThis,  readSub,             this.lensSpec().getIsNullSafe());
        val subWrite   = (WriteLens>)LensUtils.createSubWrite(readThis, writeThis, writeSub, this.lensSpec().getIsNullSafe());
        val spec = LensUtils.createLensSpecParameterized(subRead, subWrite, subCreator);
        val lens = (OptionalLens)()->spec;
        return lens;
    }
    
    protected , VALUELENS extends AnyLens>
        MapLens createSubMapLens(
                Function>           readSub,
                WriteLens>           writeSub,
                Function,   KEYLENS>   keyLensCreator,
                Function, VALUELENS> valueLensCreator) {
        val readThis   = this.lensSpec().getRead();
        val writeThis  = this.lensSpec().getWrite();
        val subRead    = (Function>) LensUtils.createSubRead(readThis,  readSub,             this.lensSpec().getIsNullSafe());
        val subWrite   = (WriteLens>)LensUtils.createSubWrite(readThis, writeThis, writeSub, this.lensSpec().getIsNullSafe());
        return MapLens.of(subRead, subWrite, keyLensCreator, valueLensCreator);
    }   
    protected , VALUELENS extends AnyLens>
        FuncMapLens createSubFuncMapLens(
                Function>           readSub,
                WriteLens>           writeSub,
                Function,   KEYLENS>   keyLensCreator,
                Function, VALUELENS> valueLensCreator) {
        val readThis   = this.lensSpec().getRead();
        val writeThis  = this.lensSpec().getWrite();
        val subRead    = (Function>) LensUtils.createSubRead(readThis,  readSub,             this.lensSpec().getIsNullSafe());
        val subWrite   = (WriteLens>)LensUtils.createSubWrite(readThis, writeThis, writeSub, this.lensSpec().getIsNullSafe());
        return FuncMapLens.of(subRead, subWrite, keyLensCreator, valueLensCreator);
    }
    
}