//! Named constants for the GoingsOn application.
//!
//! This module centralizes magic numbers and configuration values
//! to improve maintainability and documentation.

// ============ Time Constants ============

/// Hours in a day.
pub const HOURS_PER_DAY: f64 = 24.0;

/// Days in a week.
pub const DAYS_PER_WEEK: i64 = 7;

/// Approximate days in a month (for relative date calculations).
pub const APPROXIMATE_DAYS_PER_MONTH: i64 = 30;

// ============ Parser Defaults ============

/// Default hour for parsed dates (9:00 AM).
pub const DEFAULT_PARSE_HOUR: u32 = 9;

/// Default minute for parsed dates.
pub const DEFAULT_PARSE_MINUTE: u32 = 0;

// ============ Urgency Thresholds ============

/// Urgency score threshold for "high" classification (on a 0–10 scale).
/// Scores are computed by `calculate_urgency()` from priority, due date
/// proximity, task age, and tags. Tasks above 8.0 get the "urgency-high"
/// CSS class and sort to the top of the list.
pub const URGENCY_HIGH_THRESHOLD: f64 = 8.0;

/// Urgency score threshold for "medium" classification (on the same 0–10 scale).
/// Tasks between 5.0 and 8.0 get "urgency-medium"; below 5.0 gets "urgency-low".
pub const URGENCY_MEDIUM_THRESHOLD: f64 = 5.0;

// ============ Display Thresholds ============

/// Number of days for short-form due date display (e.g., "+3d" instead of "Mar 15").
/// Used by `TaskResponse::from()` and `GoingsOn.utils.formatDue()` in the frontend
/// to decide between relative ("today", "+3d") and absolute ("Mar 15") formats.
pub const DAYS_THRESHOLD_SHORT_FORMAT: i64 = 7;

// ============ Preview Lengths ============

/// Maximum length for email body preview snippets in the email list view.
/// Truncates the plain-text body to this many characters for the compact
/// thread listing, with an ellipsis appended if truncated.
pub const EMAIL_BODY_PREVIEW_LENGTH: usize = 100;

// ============ Validation Limits ============

/// Maximum length for project names.
pub const MAX_PROJECT_NAME_LENGTH: usize = 255;

/// Maximum length for task descriptions.
pub const MAX_TASK_DESCRIPTION_LENGTH: usize = 2000;

/// Maximum length for event titles.
pub const MAX_EVENT_TITLE_LENGTH: usize = 255;

/// Maximum length for contact display names.
pub const MAX_CONTACT_DISPLAY_NAME_LENGTH: usize = 255;

/// Maximum scheduled duration in minutes (24 hours).
pub const MAX_SCHEDULED_DURATION_MINUTES: i32 = 24 * 60;

/// Maximum relative date offset in days (~10 years).
pub const MAX_RELATIVE_DATE_DAYS: i64 = 3650;

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn urgency_thresholds_are_ordered() {
        const { assert!(URGENCY_HIGH_THRESHOLD > URGENCY_MEDIUM_THRESHOLD) };
        const { assert!(URGENCY_MEDIUM_THRESHOLD > 0.0) };
    }

    #[test]
    fn max_scheduled_duration_is_24_hours() {
        assert_eq!(MAX_SCHEDULED_DURATION_MINUTES, 1440);
    }
}