#!/usr/bin/lua
--[[

        Part of AREDN® -- Used for creating Amateur Radio Emergency Data Networks
        Copyright (C) 2023 Tim Wilkinson
        See Contributors file for additional contributors

        This program is free software: you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation version 3 of the License.

        This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with this program.  If not, see <http://www.gnu.org/licenses/>.

        Additional Terms:

        Additional use restrictions exist on the AREDN® trademark and logo.
                See AREDNLicense.txt for more info.

        Attributions to the AREDN® Project must be retained in the source code.
        If importing this code into a new or existing project attribution
        to the AREDN® project must be added to the source code.

        You must not misrepresent the origin of the material contained within.

        Modified versions must be modified to attribute to the original source
        and be marked in reasonable ways as differentiate it from the original
        version

--]]

require("nixio")
require("aredn.hardware")
require("aredn.http")
local html = require("aredn.html")

math.randomseed(os.time())

local base = "/etc/aredn_include/"
local xlink_file = "/etc/config.mesh/xlink"

local default_5_port_layout = { ports = { [1] = "wan", [2] = "lan1", [3] = "lan2", [4] = "lan3", [5] = "lan4" } }
local default_3_port_layout = { ports = { [1] = "lan2", [2] = "lan1", [3] = "wan" } }
local function default_n_port_layout(board_type)
    local ports = {}
    for _, i in ipairs(nixio.getifaddrs())
    do
        if i.family == "packet" and i.name:match("^eth") then
            ports[#ports + 1] = i.name
        end
    end
    return { ports = ports }
end
local layouts = {
    ["mikrotik,hap-ac2"] = default_5_port_layout,
    ["mikrotik,hap-ac3"] = default_5_port_layout,
    ["glinet,gl-b1300"] = default_3_port_layout,
    ["qemu"] = default_n_port_layout,
    ["vmware"] = default_n_port_layout
}

local default_5_port_config = {
    {
        name = "dtdlink",
        vlan = 2,
        ports = { lan4 = { tagged = true } },
        tagged = true
    },
    {
        name = "lan",
        vlan = 3,
        ports = { lan1 = { tagged = false }, lan2 = { tagged = false }, lan3 = { tagged = false } },
        tagged = false
    },
    {
        name = "wan",
        vlan = 1,
        ports = { wan = { tagged = false } },
        tagged = false
    }
}
local default_3_port_config = {
    {
        name = "dtdlink",
        vlan = 2,
        ports = { lan2 = { tagged = true } },
        tagged = true
    },
    {
        name = "lan",
        vlan = 3,
        ports = { lan1 = { tagged = false } },
        tagged = false
    },
    {
        name = "wan",
        vlan = 1,
        ports = { wan = { tagged = false } },
        tagged = false
    }
}
local default_1_port_config = {
    {
        name = "dtdlink",
        vlan = 2,
        ports = { eth0 = { tagged = true } },
        tagged = true
    },
    {
        name = "lan",
        vlan = 3,
        ports = { eth0 = { tagged = false } },
        tagged = false
    },
    {
        name = "wan",
        vlan = 1,
        ports = { eth0 = { tagged = true } },
        tagged = true
    }
}
local default_configs = {
    ["mikrotik,hap-ac2"] = default_5_port_config,
    ["mikrotik,hap-ac3"] = default_5_port_config,
    ["glinet,gl-b1300"] = default_3_port_config,
    ["qemu"] = default_1_port_config,
    ["vmware"] = default_1_port_config
}

function read_user_config(network)
    local file = base .. network .. ".network.user"
    if not nixio.fs.stat(file) then
        return nil
    end
    local config = {
        name = network,
        vlan = nil,
        ports = {},
        tagged = false
    }
    local invlan = false
    for line in io.lines(file)
    do
        if line:match("^config%s+bridge%-vlan") then
            invlan = true
        elseif line:match("^config") then
            invlan = false
        elseif invlan then
            local m
            m = line:match("option%s+vlan%s+'(%d+)'")
            if m then
                config.vlan = tonumber(m)
                if config.vlan == 2 or config.vlan >= 4 then
                    config.tagged = true
                else
                    config.tagged = false
                end
            end
            m = line:match("list%s+ports%s+'(%S+):u'") or line:match("list%s+ports%s+'(%S+):t'")
            if m then
                config.ports[m] = {
                    tagged = config.tagged
                }
            end
        end
    end
    return config
end

function read_xlink_config()
    if not nixio.fs.stat(xlink_file) then
        return {}
    end
    local configs = {}
    local config = {}
    local type = "none"
    for line in io.lines(xlink_file)
    do
        if line:match("^config%s+bridge%-vlan") then
            type = "vlan"
            config = {
                name = nil,
                vlan = nil,
                ipaddr = nil,
                peer = nil,
                weight = 0,
                port = nil,
                netmask = nil,
                mac = ""
            }
            configs[#configs + 1] = config
        elseif line:match("^config%s+interface") then
            type = "interface"
            config.name = line:match("^config%s+interface%s+'(%S+)'")
        elseif type == "vlan" then
            local m
            m = line:match("option%s+vlan%s+'(%d+)'")
            if m then
                config.vlan = tonumber(m)
            end
            m = line:match("list%s+ports%s+'(%S+):t'")
            if m then
                config.port = m
            end
        elseif type == "interface" then
            local m
            m = line:match("option%s+macaddr%s+'(%S+)'")
            if m then
                config.mac = m
            end
            m = line:match("option%s+ipaddr%s+'([%d%.]+)'")
            if m then
                config.ipaddr = m
            end
            m = line:match("option%s+peer%s+'([%d%.]+)'")
            if m then
                config.peer = m
            end
            m = line:match("option%s+weight%s+'([%d]+)'")
            if m then
                config.weight = tonumber(m)
            end
            m = line:match("option%s+netmask%s+'([%d%.]+)'")
            if m then
                config.netmask = m
            end
        end
    end
    return configs
end

function write_user_config(config, variables)
    local network = config.name
    local f = io.open(base .. network .. ".network.user", "w")
    f:write("# Generated by advancednetwork\n")
    f:write("\nconfig bridge-vlan\n")
    f:write("\toption device 'br0'\n")
    f:write("\toption vlan '" .. config.vlan .. "'\n")
    for name, port in pairs(config.ports)
    do
        f:write("\tlist ports '" .. name .. (port.tagged and ":t" or ":u") .. "'\n")
    end
    f:write("\nconfig device\n")
    f:write("\toption name 'br-" .. network .. "'\n")
    f:write("\toption type 'bridge'\n")
    f:write("\toption macaddr '<" .. network .. "_mac>'\n")
    f:write("\tlist ports 'br0." .. config.vlan .. "'\n")
    f:write("\nconfig interface " .. network .. "\n")
    f:write("\toption device 'br-" .. network .. "'\n")
    if network == "dtdlink" then
        f:write("\toption proto 'static'\n")
        f:write("\toption ipaddr '<" .. network .. "_ip>'\n")
        f:write("\toption netmask '255.0.0.0'\n")
    else
        f:write("\toption proto '<" .. network .. "_proto>'\n")
        f:write("\toption ipaddr '<" .. network .. "_ip>'\n")
        f:write("\toption netmask '<" .. network .. "_mask>'\n")
    end
    if network == "lan" then
        f:write("\toption dns '<wan_dns1> <wan_dns2>'\n")
    end
    if network == "wan" then
        f:write("\toption gateway '<wan_gw>'\n")
    end
    f:close()
end

function update_legacy_wan_vlan(config)
    local lines = {}
    for line in io.lines("/etc/config.mesh/_setup")
    do
        if not line:match("^wan_intf = ") then
            lines[#lines + 1] = line
        end
    end

    for name, port in pairs(config.ports)
    do
        if port.tagged then
            local wan_intf = ""
            for dev in aredn.hardware.get_board_network_ifname("wan"):gmatch("%S+")
            do
                wan_intf = wan_intf .. " " .. dev:match("^([^%.]+)") .. "." .. config.vlan
            end
            if wan_intf ~= "" then
                lines[#lines + 1] = "wan_intf =" .. wan_intf
            end
            break
        end
    end

    local f = io.open("/etc/config.mesh/_setup", "w")
    if f then
        for _, line in ipairs(lines)
        do
            f:write(line .. "\n")
        end
        f:close()
    end
end

function write_xlink_config(configs)
    local f = io.open(xlink_file, "w")
    f:write("# Generated by advancednetwork\n")
    for _, config in ipairs(configs)
    do
        f:write("\nconfig bridge-vlan '" .. config.name .. "bridge'\n")
        f:write("\toption device 'br0'\n")
        f:write("\toption vlan '" .. config.vlan .. "'\n")
        f:write("\tlist ports '" .. config.port .. ":t'\n")
        f:write("\nconfig interface '" .. config.name .. "'\n")
        f:write("\toption ifname 'br0." .. config.vlan .. "'\n")
        if config.mac == "" then
            config.mac = string.gsub("x2:xx:xx:xx:xx:xx", "x", function()
                local i = math.random(1, 16)
                return string.sub("0123456789ABCDEF", i, i)
            end)
        end
        f:write("\toption macaddr '" .. config.mac .. "'\n")
        f:write("\toption proto 'static'\n")
        f:write("\toption ipaddr '" .. config.ipaddr .. "'\n")
        f:write("\toption weight '" .. config.weight .. "'\n")
        if config.netmask and config.netmask ~= "" then
            f:write("\toption netmask '" .. config.netmask .. "'\n")
        else
            f:write("\toption netmask '255.255.255.255'\n")
        end
        if config.peer and config.peer ~= "" then
            f:write("\toption peer '" .. config.peer .. "'\n")
            f:write("\nconfig route '" .. config.name .. "route'\n")
            f:write("\toption interface '" .. config.name .. "'\n")
            f:write("\toption target '" .. config.peer .. "'\n")
        end
    end
    f:close()
end

local get_board_type = aredn.hardware.get_board_type()

local layout = layouts[get_board_type]
if type(layout) == "function" then
    layout = layout(get_board_type)
end
local configs = {}

local pending_restart = false

if os.getenv("REQUEST_METHOD") == "POST" then
    require('luci.http')
    local request = luci.http.Request(nixio.getenv(),
      function()
        local v = io.read(1024)
        if not v then
            io.close()
        end
        return v
      end
    )
    local params = request:formvalue()
    if params.op == "save" then
        if params.configs then
            local variables = {}
            for line in io.lines("/etc/config.mesh/_setup")
            do
                if not (line:match("^%s*#") or line:match("^%s*$")) then
                    local k, v = line:match("^([^%s]*)%s*=%s*(.*)%s*$")
                    variables[k] = v
                end
            end
            local configs = luci.jsonc.parse(params.configs)
            for _, config in ipairs(configs)
            do
                write_user_config(config, variables)
                if config.name == "wan" then
                    update_legacy_wan_vlan(config)
                end
            end
            write_xlink_config(luci.jsonc.parse(params.xlinks))
            pending_restart = true
        end
    elseif params.op == "defaults" then
        for _, network in ipairs({ "dtdlink", "lan", "wan" })
        do
            nixio.fs.remove(base .. network .. ".network.user")
        end
        write_xlink_config({})
        pending_restart = true
    elseif params.op == "reboot" then
        html.reboot()
    end
end

local default_config = default_configs[get_board_type]
if type(default_config) == "function" then
    default_config = default_config(get_board_type)
end
if default_config then
    for _, network in ipairs({ "dtdlink", "lan", "wan" })
    do
        local config = read_user_config(network)
        if not config then
            for _, dconfig in ipairs(default_config)
            do
                if dconfig.name == network then
                    config = dconfig
                    break
                end
            end
        end
        configs[#configs + 1] = config
    end
end

local xlinks = read_xlink_config()

http_header()
html.header("Advanced Network Configuration")
html.print("<body><center>")
html.alert_banner()
html.print([[
    <style>
        .title {
            font-size: 24px;
            padding: 5px 0;
            text-align: center;
        }
        .control {
            text-align: center;
            padding-bottom: 8px;
        }
        .control input {
            margin: 0 4px;
        }
        .msg {
            font-size: 14px;
            text-align: center;
            font-weight: bold;
            padding-bottom: 10px;
        }
        caption {
            font-size: 12px;
            font-weight: bold;
            padding-bottom: 6px;
        }
        .ports {
            margin: 10px 0 30px 0;
            padding: 20px;
            border: 1px solid #808080;
        }
        .ports tr:first-child {
            font-variant: all-small-caps;
        }
        .ports td {
            text-align: center;
            vertical-align: middle;
        }
        .ports td:first-child {
            text-align: left;
        }
        .h {
            width: 50px;
            font-size: 16px;
            font-weight: bold;
        }
        .l {
            font-size: 12px;
            font-weight: bold;
            width: 120px;
            padding: 6px 0 2px 0;
        }
        .v {
            font-size: 12px;
            color: grey;
        }
        .v input {
            padding-left: 2px;
            font-size: 12px;
            width: 65px;
            border: 1px solid #c0c0c0;
        }
        .xlinks {
            min-width: 610px;
            margin: 30px auto;
            padding: 20px;
            border: 1px solid #808080;
        }
        .xlinks .h {
            height: 30px;
            vertical-align: top;
            font-variant: all-small-caps;
        }
        .xlinks td {
            width: 100px;
            padding-left: 10px;
        }
        .xlinks td:nth-child(1), .xlinks td:nth-child(4), .xlinks td:nth-child(5) {
            width: 40px;
        }
        .xlinks td:nth-child(6), .xlinks td:nth-child(7) {
            width: 20px;
        }
        .xlinks td input {
            width: 100%;
            border: 1px solid transparent;
        }
        .xlinks td input.error {
            border-color: red;
        }
        .xlinks td:nth-child(1) input, .xlinks td:nth-child(4) input {
            text-align: right;
        }
        .xlinks td:nth-child(7) button {
            width: 24px;
            line-height: 14px;
            background-color: #f0f0f0;
            border: 1px solid #c0c0c0;
            border-radius: 5px;
        }
    </style>
]])
html.print([[
    <script>
        const configs = ]] .. luci.jsonc.stringify(configs, true) .. [[;
        configs.forEach(config => {
            if (Array.isArray(config.ports)) {
                config.ports = {}
            }
        });
        function port_change(input, network, port, checked) {
            const config = configs.find(c => c.name == network);
            if (!config.tagged && checked) {
                configs.forEach(config => {
                    if (!config.tagged && config.ports[port]) {
                        input.checked = false;
                    }
                });
                if (!input.checked) {
                    return;
                }
            }
            if (checked) {
                config.ports[port] = { tagged: config.tagged };
            }
            else {
                delete config.ports[port]
            }
        }
        function wan_vlan_change(input, value) {
            const config = configs.find(c => c.name == "wan");
            if (isNaN(value) || value < 4) {
                if (config.tagged) {
                    config.tagged = false;
                    config.vlan = 1;
                    config.ports = {};
                    const boxes = document.querySelectorAll("#wan_row td input[type=checkbox]");
                    for (let i = 0; i < boxes.length; i++) {
                        boxes[i].checked = false;
                    }
                }
                input.value = "";
            }
            else {
                config.tagged = true;
                config.vlan = value;
                for (port in config.ports) {
                    config.ports[port].tagged = true;
                }
                input.value = value;
            }
            validate();
        }
        function xlink_add() {
            const tbody = document.querySelector("table.xlinks tbody");
            const row = document.createElement("tr");
            row.innerHTML = "<td><input type='text' value=''></td><td><input type='text' value=''></td><td><input type='text' value=''></td><td><input type='text' value='0'></td>]]
                .. (function() local s = "<td" if #layout.ports <= 1 then s = s .. " style='display:none'" end s = s .. "><select>" for pos, port in ipairs(layout.ports) do s = s .. "<option value='" .. port .. "'>" .. pos .. "</option>" end return s .. "</select></td>" end)()
                .. (function() local s = "<td><select><option value=''>-</option>" for v = 30, 16, -1 do s = s .. "<option value='" .. v .. "'>/" .. v .. "</option>" end return s .. "</select></td>" end)()
                .. [[<td><input type='hidden' value=''><button onclick='xlink_remove(this)'>-</button></td>"
            tbody.appendChild(row)
            validate();
        }
        function xlink_remove(button) {
            const row = button.parentNode.parentNode;
            row.parentNode.removeChild(row)
            validate();
        }
        function generate_xlinks() {
            const xlinks = [];
            const rows = document.querySelectorAll("table.xlinks tr");
            for (let i = 1; i < rows.length; i++) {
                const cells = rows[i].querySelectorAll("td input");
                const selects = rows[i].querySelectorAll("select");
                xlinks.push({
                    name: "xlink" + (i - 1),
                    vlan: parseInt(cells[0].value),
                    ipaddr: cells[1].value,
                    peer: cells[2].value,
                    weight: parseInt(cells[3].value),
                    port: selects[0].value,
                    netmask: {
                        "": "255.255.255.255",
                        "30": "255.255.255.252",
                        "29": "255.255.255.248",
                        "28": "255.255.255.240",
                        "27": "255.255.255.224",
                        "26": "255.255.255.192",
                        "25": "255.255.255.128",
                        "24": "255.255.255.0",
                        "23": "255.255.254.0",
                        "22": "255.255.252.0",
                        "21": "255.255.248.0",
                        "20": "255.255.240.0",
                        "19": "255.255.224.0",
                        "18": "255.255.192.0",
                        "17": "255.255.128.0",
                        "16": "255.255.0.0"
                    }[selects[1].value],
                    mac: cells[4].value
                });
            }
            return xlinks;
        }
        function validate() {
            let cansave = true;
            const wan_config = configs.find(c => c.name == "wan");
            let wan_vlan = "__untagged__";
            if (wan_config && wan_config.tagged) {
                wan_vlan = wan_config.vlan;
            }
            const rows = document.querySelectorAll("table.xlinks tr");
            for (let i = 1; i < rows.length; i++) {
                const cells = rows[i].querySelectorAll("td input");
                if (/^\d+$/.test(cells[0].value) && parseInt(cells[0].value) > 3 && cells[0].value != wan_vlan) {
                    cells[0].classList.remove("error");
                }
                else {
                    cells[0].classList.add("error");
                    cansave = false;
                }
                if (/^\d+\.\d+\.\d+\.\d+$/.test(cells[1].value)) {
                    cells[1].classList.remove("error");
                }
                else {
                    cells[1].classList.add("error");
                    cansave = false;
                }
                if (cells[2].value == "" || /^\d+\.\d+\.\d+\.\d+$/.test(cells[2].value)) {
                    cells[2].classList.remove("error");
                }
                else {
                    cells[2].classList.add("error");
                    cansave = false;
                }
                if (/^\d+$/.test(cells[3].value)) {
                    cells[3].classList.remove("error");
                }
                else {
                    cells[3].classList.add("error");
                    cansave = false;
                }
                if (!cells[1].classList.contains("error") && !cells[1].classList.contains("error")) {
                    const ip = cells[1].value.split(".");
                    const peer = cells[2].value.split(".");
                    const i3 = parseInt(ip[3]);
                    const p3 = parseInt(peer[3]);
                    if (i3 == 0 || p3 == 0 || i3 == 255 || p3 == 255) {
                        cells[1].classList.add("error");
                        cells[2].classList.add("error");
                        cansave = false;
                    }
                }
            }

            if (cansave) {
                document.getElementById("save").disabled = null;
            }
            else {
                document.getElementById("save").disabled = "disabled"
            }
        }
        function save_config() {
            document.getElementById('configs').value = JSON.stringify(configs);
            document.getElementById('xlinks').value = JSON.stringify(generate_xlinks());
        }
    </script>
]])
html.print("<div>")

-- navbar
html.navbar_admin("advancednetwork")

html.print([[
    <div class="control">
        <form method="post" action="advancednetwork" enctype="multipart/form-data">
            <input type="button" id="save" value="Save Changes" onclick="save_config(); document.getElementById('op').value = 'save'; form.submit()">
            <input type="button" value="Default Values" onclick="document.getElementById('op').value = 'defaults'; form.submit()">
            <input type="button" value="Reboot" style="font-weight:bold" onclick="document.getElementById('op').value = 'reboot'; form.submit()">
            <input type="hidden" name="configs" id="configs" value="">
            <input type="hidden" name="xlinks" id="xlinks" value="">
            <input type="hidden" name="op" id="op" value="">
        </form>
    </div>
]])

if nixio.fs.stat("/tmp/reboot-required") then
    html.print("<div class='msg'>Reboot is required for changes to take effect</div>")
end

if #layout.ports > 1 then
    html.print([[<table class="ports" align="center"><caption>Ports</caption>]])
    html.print("<tr>")
    html.print("<td></td>")
    for pos, port in ipairs(layout.ports)
    do
        html.print("<td class='h'>" .. pos .. "</td>")
    end
    html.print("</tr>")
    for _, config in ipairs(configs)
    do
        html.print("<tr id='" .. config.name .. "_row'>")
        html.print("<td>")
        html.print("<div class='l'>" .. config.name .. "</div>")
        if config.name == "wan" then
            local value = config.tagged and config.vlan or ""
            html.print("<div class='v'>vlan: <input type='text' placeholder='Untagged' onchange='wan_vlan_change(this, parseInt(this.value))' value='" .. value .. "'></div>")
        elseif config.name == "dtdlink" then
            html.print("<div class='v'>vlan: <span>2</span></div>")
        else
            html.print("<div class='v'>vlan: <span>Untagged</span></div>")
        end
        html.print("</td>")
        for _, port in ipairs(layout.ports)
        do
            local checked = config.ports[port] and "checked" or ""
            html.print("<td><input type='checkbox' " .. checked .. " onchange='port_change(this, \"" .. config.name .. "\", \"" .. port .. "\", this.checked)'></td>")
        end
        html.print("</tr>")
    end
    html.print([[</table>]])
end

html.print([[<table class="xlinks" align="center"><caption>Xlinks</caption>]])
html.print([[<tr class="h"><td>vlan</td><td>ip address</td><td>peer address</td><td>weight</td>]])
if #layout.ports > 1 then
    html.print([[<td>&nbsp;port</td>]])
else
    html.print([[<td style='display:none'>&nbsp;port</td>]])
end
html.print([[<td>cidr</td>]])
html.print([[<td><button onclick="xlink_add()">+</button></td></tr>]])
for _, xlink in ipairs(xlinks)
do
    html.print("<tr id='" .. xlink.name .. "'>")
    html.print("<td><input type='text' value='" .. xlink.vlan .. "'></td><td><input type='text' value='" .. xlink.ipaddr .. "'></td><td><input type='text' value='" .. (xlink.peer or "") .. "'></td>")
    html.print("<td><input type='text' value='" .. xlink.weight .. "'></td>")
    html.print("<td" .. (#layout.ports <= 1 and " style='display:none'" or "") .. "><select>")
    for pos, port in ipairs(layout.ports)
    do
        html.print("<option value='" .. port .. "'" .. (xlink.port == port and " selected" or "") .. ">" .. pos .. "</option>")
    end
    html.print("</select></td>")
    html.print("<td><select>")
    html.print("<option value=''>-</option>")
    local cidr = netmask_to_cidr(xlink.netmask)
    for v = 30, 16, -1
    do
        html.print("<option value='" .. v .. "'" .. (cidr == v and " selected" or "") .. ">/" .. v .. "</option>")
    end
    html.print("</select></td>")
    html.print("<td><input type='hidden' value='" .. xlink.mac .. "'><button onclick='xlink_remove(this)'>-</button></td>")
    html.print("</tr>")
end
html.print([[</table>]])
html.print([[<script>document.querySelector(".xlinks").addEventListener("change", validate);</script>]])

print("</div></center>")
html.footer()
html.print("</body></html>")
http_footer()

if pending_restart then
    os.execute("/usr/local/bin/node-setup > /dev/null 2>&1")
    os.execute("/usr/local/bin/restart-services.sh > /dev/null 2>&1")
end