module main

import net.http
import time
import sources

pub struct NtfyClient {
pub mut:
	base_url   string
	auth_token string
	logger     Logger
}

pub fn new_ntfy_client(cfg ServerConfig, logger Logger) NtfyClient {
	return NtfyClient{
		base_url:   cfg.url.trim_right('/')
		auth_token: cfg.auth_token
		logger:     logger
	}
}

fn join_tags(tags []string) string {
	return tags.join(',')
}

// publish sends an event to the Ntfy server with exponential backoff retry (3 attempts).
pub fn (c NtfyClient) publish(event sources.Event) ! {
	url := '${c.base_url}/${event.topic}'
	mut header := http.Header{}
	header.add_custom('Content-Type', 'text/plain')!
	header.add_custom('X-Priority', event.priority.str())!
	if event.tags.len > 0 {
		header.add_custom('X-Tags', join_tags(event.tags))!
	}
	if c.auth_token != '' {
		header.add(.authorization, 'Bearer ${c.auth_token}')
	}
	// v0.5 — Click URL (opens when notification is tapped)
	if event.click_url != '' {
		header.add_custom('X-Click', event.click_url)!
	}
	// v0.5 — Action buttons
	if event.actions.len > 0 {
		mut action_strs := []string{}
		for a in event.actions {
			action_strs << '${a.action}, ${a.label}, ${a.url}${if a.clear { ', clear=true' } else { '' }}'
		}
		header.add_custom('X-Actions', action_strs.join('; '))!
	}

	c.logger.debug('ntfy', 'publish',
		'POST ${url} priority=${event.priority} tags=${join_tags(event.tags)}')

	// Retry with exponential backoff: 3 attempts, 1s / 2s / 4s delays
	mut last_err := error('unknown')
	for attempt := 1; attempt <= 3; attempt++ {
		resp := http.fetch(http.FetchConfig{
			url:    url
			method: .post
			header: header
			data:   event.message
		}) or {
			last_err = err
			if attempt < 3 {
				delay := time.second * (1 << (attempt - 1))
				c.logger.warn('ntfy', 'publish',
					'attempt ${attempt}/3 failed: ${err}, retrying in ${delay}')
				time.sleep(delay)
			}
			continue
		}

		if resp.status_code >= 200 && resp.status_code < 300 {
			c.logger.debug('ntfy', 'publish', 'success ${resp.status_code}')
			return
		}

		last_err = error('ntfy returned ${resp.status_code}: ${resp.body}')
		if attempt < 3 {
			delay := time.second * (1 << (attempt - 1))
			c.logger.warn('ntfy', 'publish',
				'attempt ${attempt}/3 failed: ${last_err}, retrying in ${delay}')
			time.sleep(delay)
		}
	}

	return last_err
}