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use std::collections::HashMap;
use crate::ssh_config::model::{ConfigElement, HostEntry, SshConfigFile};
use super::config::ProviderSection;
use super::{Provider, ProviderHost};
/// Result of a sync operation.
#[derive(Debug, Default)]
pub struct SyncResult {
pub added: usize,
pub updated: usize,
pub removed: usize,
pub unchanged: usize,
/// Hosts marked stale (disappeared from provider but not hard-deleted).
pub stale: usize,
/// Alias renames: (old_alias, new_alias) pairs.
pub renames: Vec<(String, String)>,
}
/// Sanitize a server name into a valid SSH alias component.
/// Lowercase, non-alphanumeric chars become hyphens, collapse consecutive hyphens.
/// Falls back to "server" if the result would be empty (all-symbol/unicode names).
fn sanitize_name(name: &str) -> String {
let mut result = String::new();
for c in name.chars() {
if c.is_ascii_alphanumeric() {
result.push(c.to_ascii_lowercase());
} else if !result.ends_with('-') {
result.push('-');
}
}
let trimmed = result.trim_matches('-').to_string();
if trimmed.is_empty() {
"server".to_string()
} else {
trimmed
}
}
/// Build an alias from prefix + sanitized name.
/// If prefix is empty, uses just the sanitized name (no leading hyphen).
fn build_alias(prefix: &str, sanitized: &str) -> String {
if prefix.is_empty() {
sanitized.to_string()
} else {
format!("{}-{}", prefix, sanitized)
}
}
/// Whether a metadata key is volatile (changes frequently without user action).
/// Volatile keys are excluded from the sync diff comparison so that a status
/// change alone does not trigger an SSH config rewrite. The value is still
/// stored and displayed when the host is updated for other reasons.
fn is_volatile_meta(key: &str) -> bool {
key == "status"
}
/// Sync hosts from a cloud provider into the SSH config.
/// Provider tags are always stored in `# purple:provider_tags` and exactly
/// mirror the remote state. User tags in `# purple:tags` are preserved.
pub fn sync_provider(
config: &mut SshConfigFile,
provider: &dyn Provider,
remote_hosts: &[ProviderHost],
section: &ProviderSection,
remove_deleted: bool,
suppress_stale: bool,
dry_run: bool,
) -> SyncResult {
let mut result = SyncResult::default();
// Build map of server_id -> alias (top-level only, no Include files).
// Keep first occurrence if duplicate provider markers exist (e.g. manual copy).
let existing = config.find_hosts_by_provider(provider.name());
let mut existing_map: HashMap<String, String> = HashMap::new();
for (alias, server_id) in &existing {
existing_map
.entry(server_id.clone())
.or_insert_with(|| alias.clone());
}
// Build alias -> HostEntry lookup once (avoids quadratic host_entries() calls)
let entries_map: HashMap<String, HostEntry> = config
.host_entries()
.into_iter()
.map(|e| (e.alias.clone(), e))
.collect();
// Track which server IDs are still in the remote set (also deduplicates)
let mut remote_ids: std::collections::HashSet<String> = std::collections::HashSet::new();
// Only add group header if this provider has no existing hosts in config
let mut needs_header = !dry_run && existing_map.is_empty();
for remote in remote_hosts {
if !remote_ids.insert(remote.server_id.clone()) {
continue; // Skip duplicate server_id in same response
}
// Empty IP means the resource exists but has no resolvable address
// (e.g. stopped VM, no static IP). Count it in remote_ids so --remove
// won't delete it, but skip add/update. Still clear stale if the host
// reappeared (it exists in the provider, just has no IP).
if remote.ip.is_empty() {
if let Some(alias) = existing_map.get(&remote.server_id) {
if let Some(entry) = entries_map.get(alias.as_str()) {
if entry.stale.is_some() {
if !dry_run {
config.clear_host_stale(alias);
}
result.updated += 1;
continue;
}
}
result.unchanged += 1;
}
continue;
}
if let Some(existing_alias) = existing_map.get(&remote.server_id) {
// Host exists, check if alias, IP or tags changed
if let Some(entry) = entries_map.get(existing_alias) {
// Included hosts are read-only; recognize them for dedup but skip mutations
if entry.source_file.is_some() {
result.unchanged += 1;
continue;
}
// Host reappeared: clear stale marking
let was_stale = entry.stale.is_some();
if was_stale && !dry_run {
config.clear_host_stale(existing_alias);
}
// Check if alias prefix changed (e.g. "do" → "ocean")
let sanitized = sanitize_name(&remote.name);
let expected_alias = build_alias(§ion.alias_prefix, &sanitized);
let alias_changed = *existing_alias != expected_alias;
let ip_changed = entry.hostname != remote.ip;
let meta_changed = {
let mut local: Vec<(&str, &str)> = entry
.provider_meta
.iter()
.filter(|(k, _)| !is_volatile_meta(k))
.map(|(k, v)| (k.as_str(), v.as_str()))
.collect();
local.sort();
let mut remote_m: Vec<(&str, &str)> = remote
.metadata
.iter()
.filter(|(k, _)| !is_volatile_meta(k))
.map(|(k, v)| (k.as_str(), v.as_str()))
.collect();
remote_m.sort();
local != remote_m
};
let trimmed_remote: Vec<String> =
remote.tags.iter().map(|t| t.trim().to_string()).collect();
let tags_changed = {
// Compare provider_tags with remote (case-insensitive, sorted)
let mut sorted_local: Vec<String> = entry
.provider_tags
.iter()
.map(|t| t.trim().to_lowercase())
.collect();
sorted_local.sort();
let mut sorted_remote: Vec<String> =
trimmed_remote.iter().map(|t| t.to_lowercase()).collect();
sorted_remote.sort();
sorted_local != sorted_remote
};
// First migration: host has old-format tags (# purple:tags) but
// no # purple:provider_tags comment yet. Tags need splitting.
let first_migration = !entry.has_provider_tags && !entry.tags.is_empty();
// After first migration: check if user tags overlap with provider tags
let user_tags_overlap = !first_migration
&& !trimmed_remote.is_empty()
&& entry.tags.iter().any(|t| {
trimmed_remote
.iter()
.any(|rt| rt.eq_ignore_ascii_case(t.trim()))
});
if alias_changed
|| ip_changed
|| tags_changed
|| meta_changed
|| user_tags_overlap
|| first_migration
|| was_stale
{
if dry_run {
result.updated += 1;
} else {
// Compute the final alias (dedup handles collisions,
// excluding the host being renamed so it doesn't collide with itself)
let new_alias = if alias_changed {
config
.deduplicate_alias_excluding(&expected_alias, Some(existing_alias))
} else {
existing_alias.clone()
};
// Re-evaluate: dedup may resolve back to the current alias
let alias_changed = new_alias != *existing_alias;
if alias_changed
|| ip_changed
|| tags_changed
|| meta_changed
|| user_tags_overlap
|| first_migration
|| was_stale
{
if alias_changed || ip_changed {
let updated = HostEntry {
alias: new_alias.clone(),
hostname: remote.ip.clone(),
..entry.clone()
};
config.update_host(existing_alias, &updated);
}
// Tags lookup uses the new alias after rename
let tags_alias = if alias_changed {
&new_alias
} else {
existing_alias
};
if tags_changed || first_migration {
config.set_host_provider_tags(tags_alias, &trimmed_remote);
}
// Migration cleanup
if first_migration {
// First migration: old # purple:tags had both provider
// and user tags mixed. Keep only tags NOT in remote
// (those must be user-added). Provider tags move to
// # purple:provider_tags.
let user_only: Vec<String> = entry
.tags
.iter()
.filter(|t| {
!trimmed_remote
.iter()
.any(|rt| rt.eq_ignore_ascii_case(t.trim()))
})
.cloned()
.collect();
config.set_host_tags(tags_alias, &user_only);
} else if tags_changed || user_tags_overlap {
// Ongoing: remove user tags that overlap with provider tags
let cleaned: Vec<String> = entry
.tags
.iter()
.filter(|t| {
!trimmed_remote
.iter()
.any(|rt| rt.eq_ignore_ascii_case(t.trim()))
})
.cloned()
.collect();
if cleaned.len() != entry.tags.len() {
config.set_host_tags(tags_alias, &cleaned);
}
}
// Update provider marker with new alias
if alias_changed {
config.set_host_provider(
&new_alias,
provider.name(),
&remote.server_id,
);
result
.renames
.push((existing_alias.clone(), new_alias.clone()));
}
// Update metadata
if meta_changed {
config.set_host_meta(tags_alias, &remote.metadata);
}
result.updated += 1;
} else {
result.unchanged += 1;
}
}
} else {
result.unchanged += 1;
}
} else {
result.unchanged += 1;
}
} else {
// New host
let sanitized = sanitize_name(&remote.name);
let base_alias = build_alias(§ion.alias_prefix, &sanitized);
let alias = if dry_run {
base_alias
} else {
config.deduplicate_alias(&base_alias)
};
if !dry_run {
// Add group header before the very first host for this provider
let wrote_header = needs_header;
if needs_header {
if !config.elements.is_empty() && !config.last_element_has_trailing_blank() {
config
.elements
.push(ConfigElement::GlobalLine(String::new()));
}
config.elements.push(ConfigElement::GlobalLine(format!(
"# purple:group {}",
super::provider_display_name(provider.name())
)));
needs_header = false;
}
let entry = HostEntry {
alias: alias.clone(),
hostname: remote.ip.clone(),
user: section.user.clone(),
identity_file: section.identity_file.clone(),
provider: Some(provider.name().to_string()),
..Default::default()
};
let block = SshConfigFile::entry_to_block(&entry);
// Insert adjacent to existing provider hosts (keeps groups together).
// For the very first host (wrote_header), fall through to push at end.
let insert_pos = if !wrote_header {
config.find_provider_insert_position(provider.name())
} else {
None
};
if let Some(pos) = insert_pos {
// Insert after last provider host with blank line separation.
config.elements.insert(pos, ConfigElement::HostBlock(block));
// Ensure blank line after the new block if the next element
// is not already a blank (prevents hosts running into group
// headers or other host blocks without visual separation).
let after = pos + 1;
let needs_trailing_blank = config.elements.get(after).is_some_and(
|e| !matches!(e, ConfigElement::GlobalLine(line) if line.trim().is_empty()),
);
if needs_trailing_blank {
config
.elements
.insert(after, ConfigElement::GlobalLine(String::new()));
}
} else {
// No existing group or first host: append at end with separator
if !wrote_header
&& !config.elements.is_empty()
&& !config.last_element_has_trailing_blank()
{
config
.elements
.push(ConfigElement::GlobalLine(String::new()));
}
config.elements.push(ConfigElement::HostBlock(block));
}
config.set_host_provider(&alias, provider.name(), &remote.server_id);
if !remote.tags.is_empty() {
config.set_host_provider_tags(&alias, &remote.tags);
}
if !remote.metadata.is_empty() {
config.set_host_meta(&alias, &remote.metadata);
}
}
result.added += 1;
}
}
// Remove deleted hosts (skip included hosts which are read-only)
if remove_deleted && !dry_run {
let to_remove: Vec<String> = existing_map
.iter()
.filter(|(id, _)| !remote_ids.contains(id.as_str()))
.filter(|(_, alias)| {
entries_map
.get(alias.as_str())
.is_none_or(|e| e.source_file.is_none())
})
.map(|(_, alias)| alias.clone())
.collect();
for alias in &to_remove {
config.delete_host(alias);
}
result.removed = to_remove.len();
// Clean up orphan provider header if all hosts for this provider were removed
if config.find_hosts_by_provider(provider.name()).is_empty() {
let header_text = format!(
"# purple:group {}",
super::provider_display_name(provider.name())
);
config
.elements
.retain(|e| !matches!(e, ConfigElement::GlobalLine(line) if line == &header_text));
}
} else if remove_deleted {
result.removed = existing_map
.iter()
.filter(|(id, _)| !remote_ids.contains(id.as_str()))
.filter(|(_, alias)| {
entries_map
.get(alias.as_str())
.is_none_or(|e| e.source_file.is_none())
})
.count();
}
// Soft-delete: mark disappeared hosts as stale (when not hard-deleting)
if !remove_deleted && !suppress_stale {
let to_stale: Vec<String> = existing_map
.iter()
.filter(|(id, _)| !remote_ids.contains(id.as_str()))
.filter(|(_, alias)| {
entries_map
.get(alias.as_str())
.is_none_or(|e| e.source_file.is_none())
})
.map(|(_, alias)| alias.clone())
.collect();
if !dry_run {
let now = std::time::SystemTime::now()
.duration_since(std::time::UNIX_EPOCH)
.unwrap_or_default()
.as_secs();
for alias in &to_stale {
// Preserve original timestamp if already stale
if entries_map
.get(alias.as_str())
.is_none_or(|e| e.stale.is_none())
{
config.set_host_stale(alias, now);
}
}
}
result.stale = to_stale.len();
}
result
}
#[cfg(test)]
#[path = "sync_tests.rs"]
mod tests;