local otel = module:require "otel"
local http = require "net.http"

local otlp_endpoint = module:get_option("otlp_endpoint")

if not otlp_endpoint then
    module:log("warn", "module disabled: otlp_endpoint unset")
    return
end

local exporter = otel.Exporter.new(http.request, otlp_endpoint)
local processor = otel.Processor.new(exporter)
local tracer = otel.Tracer.new(processor, "prosody", "muc")

local function find_tag(tags, name)
    for _, tag in ipairs(tags) do
        if tag.name == name then
            return tag
        end
    end
    return nil
end

module:hook("iq/full", function(event)
    local iq_element = event.stanza.tags[1]
    if not iq_element then
        return
    end

    if iq_element.name ~= "conference-modify" or iq_element.attr.xmlns ~= "jitsi:colibri2" then
        return
    end

    local traceparent = find_tag(iq_element.tags, "traceparent")
    if not traceparent then
        return
    end

    local span = tracer:start_span("colibri.conference-modify", {
        trace_id = traceparent.attr.trace_id,
        span_id = traceparent.attr.parent_id,
    })
    span:end_span()

    traceparent.attr.parent_id = span.span_id
end, 1)