use chrono::{DateTime, Local};
use serde::{Deserialize, Deserializer, de};
use serde_json::Value;

#[derive(Deserialize)]
pub struct DocumentPayload {
    title: String,
    summary: Option<String>,
    url: String,
    #[serde(deserialize_with = "single_or_vec")]
    tags: Vec<String>,
    published_date: DateTime<Local>,
    location: String,
}

fn str_to_int<'de, D: Deserializer<'de>>(deserializer: D) -> Result<u64, D::Error> {
    Ok(match Value::deserialize(deserializer)? {
        Value::String(s) => s.parse().map_err(de::Error::custom)?,
        Value::Number(num) => num.as_u64().ok_or(de::Error::custom("Invalid number"))?,
        _ => return Err(de::Error::custom("wrong type")),
    })
}

fn str_to_bool<'de, D: Deserializer<'de>>(deserializer: D) -> Result<bool, D::Error> {
    Ok(match Value::deserialize(deserializer)? {
        Value::String(s) => s.parse().map_err(de::Error::custom)?,
        Value::Bool(b) => b,
        _ => return Err(de::Error::custom("wrong type")),
    })
}

fn single_or_vec<'de, D: Deserializer<'de>>(deserializer: D) -> Result<Vec<String>, D::Error> {
    Ok(match Value::deserialize(deserializer)? {
        Value::String(s) => vec![s.parse().map_err(de::Error::custom)?],
        Value::Array(arr) => arr.into_iter().map(|a| a.to_string()).collect(),
        Value::Null => Vec::new(),
        _ => return Err(de::Error::custom("wrong type")),
    })
}