use std::net::SocketAddr;

#[derive(Debug, Clone)]
pub struct AppConfig {
    pub app_host: String,
    pub app_port: u16,
    pub database_url: Option<String>,
    pub ollama_base_url: String,
    pub ollama_chat_model: String,
    pub ollama_embed_model: String,
    pub help_center_seed_path: String,
    pub tickets_source: String,
}

impl AppConfig {
    pub fn from_env() -> Self {
        Self {
            app_host: env_or_default("APP_HOST", "0.0.0.0"),
            app_port: env_or_default("APP_PORT", "8080").parse().unwrap_or(8080),
            database_url: std::env::var("DATABASE_URL")
                .ok()
                .filter(|v| !v.trim().is_empty()),
            ollama_base_url: env_or_default("OLLAMA_BASE_URL", "http://localhost:11434"),
            ollama_chat_model: env_or_default("OLLAMA_CHAT_MODEL", "smollm2:360m"),
            ollama_embed_model: env_or_default("OLLAMA_EMBED_MODEL", "nomic-embed-text"),
            help_center_seed_path: env_or_default(
                "HELP_CENTER_SEED_PATH",
                "./seeds/help_articles.json",
            ),
            tickets_source: env_or_default("TICKETS_SOURCE", "chatbot"),
        }
    }

    pub fn socket_addr(&self) -> SocketAddr {
        format!("{}:{}", self.app_host, self.app_port)
            .parse()
            .expect("invalid APP_HOST/APP_PORT")
    }
}

fn env_or_default(key: &str, default: &str) -> String {
    std::env::var(key).unwrap_or_else(|_| default.to_string())
}