// Copyright Epic Games, Inc. All Rights Reserved.

"use strict";

import { ZenPage } from "./page.js"
import { Fetcher } from "../util/fetcher.js"
import { Friendly } from "../util/friendly.js"
import { PropTable, Toolbar } from "../util/widgets.js"

////////////////////////////////////////////////////////////////////////////////
class TemporalStat
{
	constructor(data, as_bytes)
	{
		this._data = data;
		this._as_bytes = as_bytes;
	}

	toString()
	{
		const columns = [
			/* count */	{},
			/* rate */	{},
			/* t */		{}, {},
		];
		const data = this._data;
		for (var key in data)
		{
			var out = columns[0];
			if (key.startsWith("rate_"))	out = columns[1];
			else if (key.startsWith("t_p")) out = columns[3];
			else if (key.startsWith("t_"))	out = columns[2];
			out[key] = data[key];
		}

		var friendly = this._as_bytes ? Friendly.kib : Friendly.sep;

		var content = "";
		for (var i = 0; i < columns.length; ++i)
		{
			const column = columns[i];
			for (var key in column)
			{
				var value = column[key];
				if (i)
				{
					value = Friendly.sep(value, 2);
					key = key.padStart(9);
					content += key + ": " + value;
				}
				else
					content += friendly(value);
				content += "\r\n";
			}
		}

		return content;
	}

	tag()
	{
		return "pre";
	}
}

////////////////////////////////////////////////////////////////////////////////
export class Page extends ZenPage
{
	async main()
	{
		const provider = this.get_param("provider", "z$");
		var stats = new Fetcher()
			.resource("stats", provider)
			.param("cidstorestats", "true")
			.param("cachestorestats", "true")
			.json();

		this.set_title("stat - " + provider);
		const section = this.add_section(provider);

		var toolbar = section.add_widget(Toolbar);
		var tb_right = toolbar.right();
		tb_right.add("filter:");
		tb_right.add("-none-").on_click((x) => this.update_filter(""));
		for (var preset of ["read.", "write.", ".request", ".bytes"])
			tb_right.add(preset).on_click((x) => this.update_filter(x), preset);
		this._filter_input = tb_right.add("", "label").tag("input");
		this._filter_input.on("change", (x) => this.update_filter(x.inner().value), this._filter_input);

		this._table = section.add_widget(PropTable);

		this._stats = stats = await stats;
		this._condense(stats);

		var first = undefined;
		for (var name in stats)
		{
			first = first || name;
			toolbar.left().add(name).on_click((x) => this.view_category(x), name);
		}

		var filter = this.get_param("filter");

		first = this.get_param("view", first);
		this.view_category(first);

		if (filter)
			this.update_filter(filter);
	}

	view_category(name)
	{
		const friendly = (this.get_param("raw") == undefined);
		this._table.clear();
		this._table.add_object(this._stats[name], friendly, 3);
		this.set_param("view", name);
		this.update_filter("");
	}

	update_filter(needle)
	{
		this._filter_input.attr("value", needle);

		this.set_param("filter", needle);
		if (!needle)
			return this._table.filter();

		var needles = needle.split(" ");
		this._table.filter(...needles);
	}

	_condense(stats)
	{
		const impl = function(node)
		{
			for (var name in node)
			{
				const candidate = node[name];
				if (!(candidate instanceof Object))
					continue;

				if (candidate["rate_mean"] != undefined)
				{
					const as_bytes = (name.indexOf("bytes") >= 0);
					node[name] = new TemporalStat(candidate, as_bytes);
					continue;
				}

				impl(candidate);
			}
		}

		for (var name in stats)
			impl(stats[name]);
	}
}