use crate::{DateTimeUtc, UserId};
use sea_orm::entity::prelude::*;
use serde::{Deserialize, Serialize};

/// Stored as `"follow"` or `"block"` in the database.
/// Use `FromStr` / `ToString` for type-safe access.
#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
pub enum RelationType {
    Follow,
    Block,
}

impl std::fmt::Display for RelationType {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            RelationType::Follow => write!(f, "follow"),
            RelationType::Block => write!(f, "block"),
        }
    }
}

impl std::str::FromStr for RelationType {
    type Err = &'static str;
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            "follow" => Ok(RelationType::Follow),
            "block" => Ok(RelationType::Block),
            _ => Err("unknown relation type"),
        }
    }
}

#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
#[sea_orm(table_name = "user_relation")]
pub struct Model {
    #[sea_orm(primary_key)]
    pub id: i64,
    pub user: UserId,
    pub target: UserId,
    pub relation_type: String,
    pub created_at: DateTimeUtc,
}

#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
pub enum Relation {}

impl ActiveModelBehavior for ActiveModel {}