use std::error::Error;

use crate::format;
use crate::map::Map;
use crate::value::{Value, ValueKind};

pub fn parse(
  uri: Option<&String>,
  text: &str,
) -> Result<Map<String, Value>, Box<dyn Error + Send + Sync>> {
  // Parse a JSON object value from the text
  let value = from_json_value(uri, &serde_json::from_str(text)?);
  format::extract_root_table(uri, value)
}

fn from_json_value(uri: Option<&String>, value: &serde_json::Value) -> Value {
  match *value {
    serde_json::Value::String(ref value) => Value::new(uri, ValueKind::String(value.clone())),

    serde_json::Value::Number(ref value) => {
      if let Some(value) = value.as_i64() {
        Value::new(uri, ValueKind::I64(value))
      } else if let Some(value) = value.as_f64() {
        Value::new(uri, ValueKind::Float(value))
      } else {
        unreachable!();
      }
    }

    serde_json::Value::Bool(value) => Value::new(uri, ValueKind::Boolean(value)),

    serde_json::Value::Object(ref table) => {
      let mut m = Map::new();

      for (key, value) in table {
        m.insert(key.clone(), from_json_value(uri, value));
      }

      Value::new(uri, ValueKind::Table(m))
    }

    serde_json::Value::Array(ref array) => {
      let mut l = Vec::new();

      for value in array {
        l.push(from_json_value(uri, value));
      }

      Value::new(uri, ValueKind::Array(l))
    }

    serde_json::Value::Null => Value::new(uri, ValueKind::Nil),
  }
}
