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package org.jooby;

import static java.util.Objects.requireNonNull;

import javax.annotation.Nonnull;

import java.io.FileNotFoundException;

import java.util.HashMap;

import java.util.Map;

/**

* Special result that hold view name and model. It will be processed by a {@link View.Engine}.

*

* @author edgar

* @since 0.1.0

*/

public class View extends Result {

/**

* Special body serializer for dealing with {@link View}.

*

* Multiples view engine are supported too.

*

* In order to support multiples view engine, a view engine is allowed to throw a

* {@link FileNotFoundException} when a template can't be resolved it.

* This gives the chance to the next view resolver to load the template.

*

* @author edgar

* @since 0.1.0

*/

public interface Engine extends Renderer {

@Override

default void render(final Object value, final Renderer.Context ctx) throws Exception {

if (value instanceof View) {

View view = (View) value;

ctx.type(MediaType.html);

render(view, ctx);

}

}

/**

* Render a view or throw a {@link FileNotFoundException} when template can't be resolved it..

*

* @param viewable View to render.

* @param ctx A rendering context.

* @throws FileNotFoundException If template can't be resolved.

* @throws Exception If view rendering fails.

*/

void render(final View viewable, final Renderer.Context ctx) throws FileNotFoundException,

Exception;

}

/** View's name. */

private final String name;

/** View's model. */

private final Map<String, Object> model = new HashMap<>();

/**

* Creates a new {@link View}.

*

* @param name View's name.

*/

protected View(final String name) {

this.name = requireNonNull(name, "View name is required.");

type(MediaType.html);

super.set(this);

}

/**

* @return View's name.

*/

@Nonnull

public String name() {

return name;

}

/**

* Set a model attribute and override existing attribute.

*

* @param name Attribute's name.

* @param value Attribute's value.

* @return This view.

*/

@Nonnull

public View put(final String name, final Object value) {

requireNonNull(name, "Model name is required.");

model.put(name, value);

return this;

}

/**

* Set model attributes and override existing values.

*

* @param values Attribute's value.

* @return This view.

*/

@Nonnull

public View put(final Map<String, ?> values) {

values.forEach((k, v) -> model.put(k, v));

return this;

}

/**

* @return View's model.

*/

@Nonnull

public Map<String, ?> model() {

return model;

}

@Override

@Nonnull

public Result set(final Object content) {

throw new UnsupportedOperationException("Not allowed in views, use one of the put methods.");

}

@Override

public String toString() {

return name + ": " + model;

}

}