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package ars.file;

import java.io.File;
import java.util.Map;
import java.util.List;

import ars.util.Files;
import ars.util.Nfile;
import ars.util.Streams;
import ars.invoke.request.Requester;
import ars.invoke.request.ParameterInvalidException;

/**
 * 文件外部操作接口标准实现
 *
 * @author wuyongqiang
 */
public class StandardDocumentManager implements DocumentManager {
    private Operator operator; // 文件处理器
    private NameGenerator nameGenerator; // 文件名称生成器
    private DirectoryGenerator directoryGenerator; // 文件目录生成器

    public Operator getOperator() {
        return operator;
    }

    public void setOperator(Operator operator) {
        this.operator = operator;
    }

    public NameGenerator getNameGenerator() {
        return nameGenerator;
    }

    public void setNameGenerator(NameGenerator nameGenerator) {
        this.nameGenerator = nameGenerator;
    }

    public DirectoryGenerator getDirectoryGenerator() {
        return directoryGenerator;
    }

    public void setDirectoryGenerator(DirectoryGenerator directoryGenerator) {
        this.directoryGenerator = directoryGenerator;
    }

    /**
     * 文件操作器有效性检查
     */
    protected void checkOperatorValidity() {
        if (this.operator == null) {
            throw new IllegalStateException("Operator not initialized");
        }
    }

    @Override
    public String upload(Requester requester, String path, Nfile file, Map parameters)
        throws Exception {
        this.checkOperatorValidity();
        String name = file.getName();
        if (this.directoryGenerator != null) {
            if (path == null) {
                path = this.directoryGenerator.generate(name);
            } else {
                path = new StringBuilder(path).append('/').append(this.directoryGenerator.generate(name)).toString();
            }
        }
        if (this.nameGenerator != null) {
            name = this.nameGenerator.generate(name);
        }
        path = path == null ? name : new StringBuilder(path).append('/').append(name).toString();
        this.operator.write(file, path);
        return path;
    }

    @Override
    public Nfile download(Requester requester, String path, Map parameters) throws Exception {
        this.checkOperatorValidity();
        return this.operator.read(path);
    }

    @Override
    public List trees(Requester requester, String path, Map parameters) throws Exception {
        this.checkOperatorValidity();
        return this.operator.trees(path, parameters);
    }

    @Override
    public String content(Requester requester, String path, Map parameters) throws Exception {
        this.checkOperatorValidity();
        return new String(this.operator.read(path).getBytes());
    }

    @Override
    public List files(Requester requester, String path, boolean spread, Map parameters)
        throws Exception {
        this.checkOperatorValidity();
        return this.operator.query().spread(spread).path(path).custom(parameters).list();
    }

    @Override
    public void copy(Requester requester, String[] sources, String target, Map parameters)
        throws Exception {
        this.checkOperatorValidity();
        for (String source : sources) {
            this.operator.copy(source, target);
        }
    }

    @Override
    public void move(Requester requester, String[] sources, String target, Map parameters)
        throws Exception {
        this.checkOperatorValidity();
        for (String source : sources) {
            this.operator.move(source, target);
        }
    }

    @Override
    public void remove(Requester requester, String[] paths, Map parameters) throws Exception {
        this.checkOperatorValidity();
        for (String path : paths) {
            this.operator.delete(path);
        }
    }

    @Override
    public void append(Requester requester, String path, String content, boolean directory,
                       Map parameters) throws Exception {
        this.checkOperatorValidity();
        if (this.operator.exists(path)) {
            throw new ParameterInvalidException("name", "exist");
        }
        if (directory) {
            this.operator.mkdirs(path);
        } else if (content == null) {
            this.operator.write(Streams.EMPTY_ARRAY, path);
        } else {
            this.operator.write(content.getBytes(), path);
        }
    }

    @Override
    public void rename(Requester requester, String path, String name, Map parameters) throws Exception {
        this.checkOperatorValidity();
        if (!Files.getName(path).equalsIgnoreCase(name)) {
            String target = new File(new File(path).getParent(), name).getPath();
            if (this.operator.exists(target)) {
                throw new ParameterInvalidException("name", "exist");
            }
            this.operator.rename(path, name);
        }
    }

    @Override
    public void update(Requester requester, String path, String content, Map parameters)
        throws Exception {
        this.checkOperatorValidity();
        if (content == null) {
            this.operator.write(Streams.EMPTY_ARRAY, path);
        } else {
            this.operator.write(content.getBytes(), path);
        }
    }

}