package io.trygvis.persistence;

import io.trygvis.container.compiler.model.ClassG;
import io.trygvis.container.compiler.model.ParameterRef;
import io.trygvis.container.compiler.model.TypeRef;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import static java.lang.String.format;
import static org.apache.commons.lang.StringUtils.join;

public class EntityMirror {
    public final GeneratorSupport generatorSupport;
    public final List<FieldMirror> fields = new ArrayList<>();
    public final List<FieldMirror> idFields = new ArrayList<>();
    public final TypeRef type;
    public final String tableName;
    public final TypeRef daoType;

    public EntityMirror(GeneratorSupport generatorSupport, TypeRef type, String tableName) {
        this.generatorSupport = generatorSupport;
        this.type = type;
        this.tableName = tableName;

        this.daoType = new TypeRef(type.name + "Dao");
    }

    public void add(FieldMirror field) {
        fields.add(field);
        if(field.id) {
            idFields.add(field);
        }
    }

    public String createTableSql() {
        List<String> columns = new ArrayList<>();
        for (FieldMirror field : fields) {
            TypeHandler typeHandler = generatorSupport.typeHandler(field.type);
            String s = "  " + field.sqlName + " " + typeHandler.sqlType(field);
            if(field.id) {
                s += " PRIMARY KEY";
            }
            columns.add(s);
        }

        return format("CREATE TABLE " + tableName + "(%n" +
                join(columns, ",%n") +
                "%n);");
    }

    public String dropTableSql() {
        return "DROP TABLE " + tableName + ";";
    }

    public String insertIntoSql() {
        List<String> names = new ArrayList<>();
        List<String> placeholders = new ArrayList<>();
        for (FieldMirror field : fields) {
            names.add(field.sqlName);
            placeholders.add("?");
        }

        return "INSERT INTO " + tableName + "(" + join(names, ", ") + ") " +
                "VALUES(" + join(placeholders, ", ") + ");";
    }

    public String deleteFromSql() {
        List<String> ss = new ArrayList<>();
        for (FieldMirror field : idFields) {
            ss.add(field.sqlName + "=?");
        }

        return "DELETE FROM " + tableName + " WHERE " + join(ss, " AND ") + ";";
    }

    public void insertInto(ClassG g) {
        TypeRef conType = g.addImport(Connection.class);
        TypeRef psType = g.addImport(PreparedStatement.class);
        TypeRef objectType = g.addImport(type);
        ParameterRef con = new ParameterRef(conType, "con");
        ParameterRef object = new ParameterRef(objectType, "o");

        List<String> body = new ArrayList<>();

        body.add("try(" + psType.name + " stmt = " + con.name + ".prepareStatement(insertIntoSql)) {");
        for (int i = 0; i < fields.size(); i++) {
            FieldMirror field = fields.get(i);
            TypeHandler typeHandler = generatorSupport.typeHandler(field.type);
            body.add("    stmt." + typeHandler.resultSetSetter(i + 1, "o", field) + ";");
        }
        body.add("    stmt.executeUpdate();");
        body.add("}");

        g.addStaticMethod(body, TypeRef.VOID, "insertInto", con, object).
                exception(g.addImport(SQLException.class));
    }
}