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use super::error::ScriptError;
use crate::script_error;
use evalexpr::Value;
use json5_nodes::{Iter, JsonNode, Location};

pub trait JsonNodeExtra {
  fn is_null(&self) -> bool;
  fn is_bool(&self) -> bool;
  fn is_integer(&self) -> bool;
  fn is_float(&self) -> bool;
  fn is_string(&self) -> bool;
  fn is_array(&self) -> bool;
  fn is_object(&self) -> bool;
  fn get_location(self: &Self) -> Option<Location>;
  fn get_object_entry<'a>(self: &'a Self, name: &str) -> Result<&'a JsonNode, ScriptError>;
  fn get_object_iter(self: &Self) -> Result<Iter<String, JsonNode>, ScriptError>;
  fn get_array_iter(self: &Self) -> Result<std::slice::Iter<JsonNode>, ScriptError>;
  fn get_value(self: &Self) -> Value;
  fn get_string(self: &Self) -> String;
}

impl JsonNodeExtra for JsonNode {
  /// Is the node null?
  fn is_null(&self) -> bool {
    if let JsonNode::Null(_) = self {
      true
    } else {
      false
    }
  }

  /// Is the node a boolean?
  fn is_bool(&self) -> bool {
    if let JsonNode::Bool(_, _) = self {
      true
    } else {
      false
    }
  }

  /// Is the node an integer?
  fn is_integer(&self) -> bool {
    if let JsonNode::Integer(_, _) = self {
      true
    } else {
      false
    }
  }

  /// Is the node a float?
  fn is_float(&self) -> bool {
    if let JsonNode::Float(_, _) = self {
      true
    } else {
      false
    }
  }

  /// Is the node a string?
  fn is_string(self: &Self) -> bool {
    if let JsonNode::String(_, _) = self {
      true
    } else {
      false
    }
  }

  /// Is the node an array?
  fn is_array(self: &Self) -> bool {
    if let JsonNode::Array(_, _) = self {
      true
    } else {
      false
    }
  }

  /// Is the node an object?
  fn is_object(self: &Self) -> bool {
    if let JsonNode::Object(_, _) = self {
      true
    } else {
      false
    }
  }

  /// Get the node location
  fn get_location(self: &Self) -> Option<Location> {
    match self {
      JsonNode::Null(location)
      | JsonNode::Bool(_, location)
      | JsonNode::Integer(_, location)
      | JsonNode::Float(_, location)
      | JsonNode::String(_, location)
      | JsonNode::Array(_, location)
      | JsonNode::Object(_, location) => *location,
    }
  }

  /// Get an object node entry
  fn get_object_entry<'a>(self: &'a Self, name: &str) -> Result<&'a JsonNode, ScriptError> {
    if let JsonNode::Object(map, ..) = self {
      if let Some(node) = map.get(name) {
        Ok(node)
      } else {
        Err(script_error!(
          format!("Object entry '{}' not found", name),
          self
        ))
      }
    } else {
      Err(script_error!("Not an object", self))
    }
  }

  // Get object node iterator
  fn get_object_iter(self: &Self) -> Result<Iter<String, JsonNode>, ScriptError> {
    if let JsonNode::Object(map, _) = self {
      Ok(map.iter())
    } else {
      Err(script_error!("Not an object", self))
    }
  }

  // Get array node iterator
  fn get_array_iter(self: &Self) -> Result<std::slice::Iter<JsonNode>, ScriptError> {
    if let JsonNode::Array(array, _) = self {
      Ok(array.iter())
    } else {
      Err(script_error!("Not an array", self))
    }
  }

  fn get_value(self: &Self) -> Value {
    match self {
      JsonNode::Null(..) => Value::Empty,
      JsonNode::Integer(value, ..) => Value::from(*value),
      JsonNode::Float(value, ..) => Value::from(*value),
      JsonNode::Bool(value, ..) => Value::from(*value),
      JsonNode::String(value, ..) => Value::from((*value).to_owned()),
      _ => Value::Empty,
    }
  }

  fn get_string(self: &Self) -> String {
    match self {
      JsonNode::Null(..) => "null".to_string(),
      JsonNode::Integer(value, ..) => (*value).to_string(),
      JsonNode::Float(value, ..) => (*value).to_string(),
      JsonNode::Bool(value, ..) => (*value).to_string(),
      JsonNode::String(value, ..) => (*value).to_string(),
      _ => String::new(),
    }
  }
}