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package io.github.wycst.wast.jdbc.query.page;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;

@SuppressWarnings({"unchecked"})
public abstract class Page {

    private long page = 1;

    private int pageSize = 10;

    private List rows;

    private long total;

    private Long offset;

    private Class cls;

    public Page() {
    }

    public Page(Class cls) {
        this.cls = cls;
    }

    public static  Page pageInstance(Class cls) {
        return new Page(cls) {
        };
    }

    public static  Page pageInstance(Class cls, long pageNum, int pageSize) {
        Page pageInstance = new Page(cls) {
        };
        pageInstance.setPageSize(pageSize);
        pageInstance.setPage(pageNum);
        return pageInstance;
    }

    public Class actualType() {
        if (this.cls != null) {
            return cls;
        }
        ParameterizedType parameterizedType = (ParameterizedType) getClass().getGenericSuperclass();
        Type[] types = parameterizedType.getActualTypeArguments();
        if (types != null && types.length > 0) {
            if (types[0] instanceof Class) {
                return (Class) types[0];
            }
        }
        return null;
    }

    public long getPage() {
        return page;
    }

    public void setPage(long page) {
        this.page = page;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public List getRows() {
        return rows;
    }

    public void setRows(List rows) {
        this.rows = rows;
    }

    public long getTotal() {
        return total;
    }

    public void setTotal(long total) {
        this.total = total;
    }

    public long getCurrentPage() {
        return this.page;
    }

    public long getOffset() {

        if (offset == null) {
            offset = (page - 1) * pageSize;
        }

        return offset;
    }

    public void setOffset(long offset) {
        this.offset = offset;
    }

}