package config

import (
	"errors"
	"reflect"
	"time"
)

// JSCKSourceEUSupply is the EU Supply source's configuration key.
const JSCKSourceEUSupply string = "eu_supply"

// JSCSourceEUSupply configures scraping the public tenders on EU Supply's
// UK portal at BaseURL (see internal/eusupply). The client waits a random
// time from RequestMinGap to RequestMaxGap after each request; both must be
// greater than 0, as the site's own limit isn't published, and a
// RequestMaxGap less than RequestMinGap is read as RequestMinGap.
type JSCSourceEUSupply struct {
	JSCSourcesSource
	BaseURL       string        `cfg:"base_url"        default:"https://uk.eu-supply.com"`
	RequestMinGap time.Duration `cfg:"request_min_gap" default:"2s"`
	RequestMaxGap time.Duration `cfg:"request_max_gap" default:"10s"`
}

// ---------- Section methods (see Section) ----------

// Map implements Section.
func (c JSCSourceEUSupply) Map() map[string]any { return mapOf(c) }

// Flatten implements Section.
func (c JSCSourceEUSupply) Flatten() map[string]any {
	return flattenOf(JSCKSourceEUSupply, c)
}

// TypeOf implements Section.
func (c JSCSourceEUSupply) TypeOf(key string) (reflect.Kind, error) {
	return typeOf(c, key)
}

// ValueOf implements Section.
func (c JSCSourceEUSupply) ValueOf(key string) (any, error) {
	return valueOf(c, key)
}

// SetValue implements Section.
func (c *JSCSourceEUSupply) SetValue(key string, value any) error {
	return setValue(c, key, value)
}

// ---------- Section specific methods ----------

// validate checks values before they are stored (see validator), as
// JSCSourcesSource's does, which this one hides. request_min_gap and
// request_max_gap must be greater than 0.
func (c *JSCSourceEUSupply) validate(key string, value any) error {
	if (key == "request_min_gap" || key == "request_max_gap") &&
		value.(time.Duration) <= 0 {
		return errors.New(
			"config: request_min_gap and request_max_gap must be greater than 0, as EU Supply publishes no rate limit",
		)
	}
	return c.JSCSourcesSource.validate(key, value)
}