module main

import net.http
import sources
import os
import time
import strconv

// apply_filters checks all filter rules and returns false if the event should be dropped.
fn (mut app App) apply_filters(mut event sources.Event) bool {
	for rule in app.cfg.filters.rules {
		if rule.match_source != '' && rule.match_source != event.source {
			continue
		}
		if rule.match_name != '' && !glob_match(event.name, rule.match_name) {
			continue
		}
		if rule.match_topic != '' && rule.match_topic != event.topic {
			continue
		}

		match rule.action {
			'drop' {
				return false
			}
			'set_priority' {
				new_prio := strconv.atoi(rule.value) or { 0 }
				if new_prio > 0 {
					event.priority = new_prio
				}
			}
			'add_tag' {
				if rule.value != '' {
					event.tags << rule.value
				}
			}
			else {}
		}
	}
	return true
}

// glob_match performs simple wildcard matching (* matches anything).
fn glob_match(s string, pattern string) bool {
	if pattern == '*' {
		return true
	}
	if !pattern.contains('*') {
		return s == pattern
	}
	parts := pattern.split('*')
	mut offset := 0
	for i, part in parts {
		if part == '' {
			if i == parts.len - 1 {
				return true
			}
			continue
		}
		idx := s.index_after(part, offset)
		idx_val := idx or { -1 }
		if idx_val < 0 {
			return false
		}
		offset = idx_val + part.len
		if i == 0 && !s.starts_with(part) && offset != part.len {
			return false
		}
	}
	return true
}

// dispatch_outgoing sends the event to all configured outgoing webhooks.
fn (mut app App) dispatch_outgoing(e sources.Event) {
	mut hdr := http.Header{}
	hdr.add_custom('Content-Type', 'application/json') or { return }

	for wh in app.cfg.outgoing.webhooks {
		body := format_outgoing(e, wh.format)
		resp := http.fetch(http.FetchConfig{
			url:    wh.url
			method: .post
			header: hdr
			data:   body
		}) or {
			app.logger.warn('server', 'outgoing', 'failed to dispatch: ${err}')
			continue
		}
		app.logger.debug('server', 'outgoing', 'dispatched to ${wh.url}: ${resp.status_code}')
	}
}

// format_outgoing formats an event for an outgoing webhook platform.
fn format_outgoing(e sources.Event, format string) string {
	match format {
		'slack' {
			emoji := match e.priority {
				5 { '🔴' }
				4 { '🟠' }
				3 { '🟡' }
				else { '🔵' }
			}
			return '{"text":"${emoji} *${e.source}:${e.name}*\\n${e.message}"}'
		}
		'discord' {
			return '{"content":"**[${e.source}]** ${e.message}"}'
		}
		else {
			return '{"source":"${e.source}","name":"${e.name}","topic":"${e.topic}","priority":${e.priority},"message":"${e.message}"}'
		}
	}
}

// save_state persists poll_state and silence_until to a JSON file.
fn (mut app App) save_state() {
	if app.cfg.state.file == '' {
		return
	}
	mut data := map[string]string{}
	for url, is_up in app.poll_state {
		data[url] = is_up.str()
	}
	data['_silence_until'] = app.silence_until.unix().str()

	json_str := json_encode_map(data)
	os.write_file(app.cfg.state.file, json_str) or {
		app.logger.warn('server', 'state', 'failed to save state: ${err}')
		return
	}
	app.logger.debug('server', 'state', 'state saved to ${app.cfg.state.file}')
}

// load_state restores poll_state and silence_until from a JSON file.
fn (mut app App) load_state() {
	if app.cfg.state.file == '' {
		return
	}
	if !os.exists(app.cfg.state.file) {
		return
	}
	raw := os.read_file(app.cfg.state.file) or {
		app.logger.warn('server', 'state', 'failed to read state file: ${err}')
		return
	}
	mut parsed := json_decode_map(raw) or {
		app.logger.warn('server', 'state', 'failed to parse state file: ${err}')
		return
	}
	for key, val in parsed {
		if key == '_silence_until' {
			ts := strconv.atoi(val) or { 0 }
			app.silence_until = time.unix(i64(ts))
			continue
		}
		app.poll_state[key] = val == 'true'
	}
	app.logger.info('server', 'state', 'restored ${app.poll_state.len} poll states')
}

// json_encode_map encodes a map[string]string as JSON.
fn json_encode_map(m map[string]string) string {
	mut parts := []string{}
	for k, v in m {
		parts << '"${k}":"${v}"'
	}
	return '{' + parts.join(',') + '}'
}

// json_decode_map parses a simple JSON object of string→string.
fn json_decode_map(raw string) !map[string]string {
	mut result := map[string]string{}
	trimmed := raw.trim_space()
	if !trimmed.starts_with('{') || !trimmed.ends_with('}') {
		return result
	}
	inner := trimmed[1..trimmed.len - 1]
	if inner == '' {
		return result
	}
	pairs := inner.split(',')
	for pair in pairs {
		kv := pair.split(':')
		if kv.len >= 2 {
			key := kv[0].trim_space().trim('"')
			val := kv[1].trim_space().trim('"')
			result[key] = val
		}
	}
	return result
}