# ═══════════════════════════════════════════════════════════════════════════════
#  VEZA — Centralized Logging Configuration
# ═══════════════════════════════════════════════════════════════════════════════
#
#  Single source of truth for ALL service logging.
#  Read by:  Go backend, Rust stream server, Frontend (via env vars)
#
#  Override any value via environment variable:
#    LOG_LEVEL=DEBUG  LOG_DIR=/tmp/veza-logs  make dev
#
# ═══════════════════════════════════════════════════════════════════════════════

# ── Global defaults ──────────────────────────────────────────────────────────

[global]
# Log level: TRACE, DEBUG, INFO, WARN, ERROR  (case-insensitive, Go & Rust compatible)
level = "INFO"

# Base directory for all log files
# Created automatically with 0755 permissions if it doesn't exist.
# Fallback: ./logs (if /var/log/veza is not writable)
dir = "/var/log/veza"

# Format: "json" (production/staging) or "text" (development)
# Auto-detected from APP_ENV if not set: production/staging → json, else → text
format = "auto"

# ── File rotation (lumberjack for Go, tracing-appender for Rust) ─────────────

[rotation]
# Maximum size of a single log file before rotation (megabytes)
max_size_mb = 100

# Maximum number of rotated files to retain
max_backups = 10

# Maximum age of rotated files before deletion (days)
max_age_days = 30

# Compress rotated files with gzip
compress = true

# Rust rotation strategy: "hourly" or "daily"
# Hourly if max_size_mb ≤ 100, daily otherwise
rust_rotation = "hourly"

# Maximum rotated files for Rust (tracing-appender)
rust_max_files = 5

# ── Go Backend API ───────────────────────────────────────────────────────────

[backend]
# Module name — determines log file names: {module}.log, {module}-error.log
module = "backend-api"

# Additional module loggers (each gets its own .log + -error.log pair)
# These log database queries, redis commands, rabbitmq events separately
modules = ["db", "rabbitmq"]

# Slow request detection threshold (milliseconds)
# Requests slower than this are logged at WARN level
slow_request_threshold_ms = 1000

# Sampling (production only — prevents log spam under high load)
# Initial: first N messages per second are always logged
# Thereafter: 1 in N subsequent messages are logged
sampling_initial = 100
sampling_thereafter = 100

# Async buffered writes
# Buffer size in KB — reduces syscalls by batching writes
buffer_size_kb = 256

# Flush interval in milliseconds — maximum delay before buffer is flushed
flush_interval_ms = 100

# ── Rust Stream Server ───────────────────────────────────────────────────────

[stream]
# Module name — determines log file prefix: {module}.YYYY-MM-DD-HH
module = "stream"

# Include source file and line number in log entries
include_source = true

# Include thread IDs in log entries
include_thread_ids = true

# ── Frontend (React) ────────────────────────────────────────────────────────

[frontend]
# Frontend log level (VITE_LOG_LEVEL)
# Defaults: DEBUG in development, WARN in production
level = "auto"

# Backend endpoint for forwarding frontend errors
# Uses navigator.sendBeacon() for non-blocking delivery
endpoint = "/api/v1/logs/frontend"

# Enable Sentry error tracking (requires VITE_SENTRY_DSN env var)
sentry_enabled = false

# ── Log Aggregation (optional — Loki/Grafana) ───────────────────────────────

[aggregation]
# Enable centralized log aggregation (Loki-compatible)
enabled = false

# Aggregation endpoint URL
# endpoint = "http://loki:3100/loki/api/v1/push"

# Batch size — number of log entries per HTTP push
batch_size = 100

# Flush interval (seconds) — maximum delay between pushes
flush_interval_s = 5

# HTTP timeout for push requests (seconds)
timeout_s = 10

# Static labels applied to all log entries
# labels = "app=veza,env=production"

# ── File permissions ─────────────────────────────────────────────────────────

[permissions]
# Directory permissions (octal)
dir_mode = "0755"

# File permissions (octal) — Go files
file_mode = "0640"

# ═══════════════════════════════════════════════════════════════════════════════
#  Environment Variable Overrides (highest priority)
# ═══════════════════════════════════════════════════════════════════════════════
#
#  LOG_LEVEL                        → global.level
#  LOG_DIR                          → global.dir
#  LOG_FORMAT                       → global.format
#  SLOW_REQUEST_THRESHOLD_MS        → backend.slow_request_threshold_ms
#  LOG_AGGREGATION_ENABLED          → aggregation.enabled
#  LOG_AGGREGATION_ENDPOINT         → aggregation.endpoint
#  LOG_AGGREGATION_BATCH_SIZE       → aggregation.batch_size
#  LOG_AGGREGATION_FLUSH_INTERVAL   → aggregation.flush_interval_s
#  LOG_AGGREGATION_TIMEOUT          → aggregation.timeout_s
#  LOG_AGGREGATION_LABELS           → aggregation.labels
#  VITE_LOG_LEVEL                   → frontend.level
#  VITE_SENTRY_DSN                  → frontend.sentry_enabled (if set)
#
# ═══════════════════════════════════════════════════════════════════════════════