//! Monthly review domain types.

use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use crate::id_types::{MonthlyGoalId, MonthlyReflectionId, UserId};

// ============ Monthly Goal ============

/// Status of a monthly goal.
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum MonthlyGoalStatus {
    Active,
    Done,
    Abandoned,
}

impl MonthlyGoalStatus {
    pub fn as_str(&self) -> &str {
        match self {
            Self::Active => "active",
            Self::Done => "done",
            Self::Abandoned => "abandoned",
        }
    }
}

impl std::str::FromStr for MonthlyGoalStatus {
    type Err = crate::CoreError;

    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
        match s {
            "active" => Ok(Self::Active),
            "done" => Ok(Self::Done),
            "abandoned" => Ok(Self::Abandoned),
            _ => Err(crate::CoreError::parse(format!("Invalid goal status: {s}"))),
        }
    }
}

/// A monthly goal — free-text item set at the start of each month.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct MonthlyGoal {
    pub id: MonthlyGoalId,
    pub user_id: UserId,
    /// Month in YYYY-MM format.
    pub month: String,
    pub text: String,
    pub status: MonthlyGoalStatus,
    /// Position 1-3.
    pub position: i32,
    pub created_at: DateTime<Utc>,
    pub updated_at: DateTime<Utc>,
}

// ============ Monthly Reflection ============

/// A monthly reflection capturing highlights and areas for improvement.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct MonthlyReflection {
    pub id: MonthlyReflectionId,
    pub user_id: UserId,
    /// Month in YYYY-MM format.
    pub month: String,
    pub highlight_text: String,
    pub change_text: String,
    pub completed_at: DateTime<Utc>,
}