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use reqwest::Error;
use serde::Deserialize;
use std::collections::HashMap;
use std::fmt;
use std::fmt::Formatter;

pub struct GraphQLError {
    message: String,
    json: Option<Vec<GraphQLErrorMessage>>,
}

// https://spec.graphql.org/June2018/#sec-Errors
#[derive(Deserialize, Debug)]
pub struct GraphQLErrorMessage {
    message: String,
    locations: Option<Vec<GraphQLErrorLocation>>,
    extensions: Option<HashMap<String, String>>,
    path: Option<Vec<GraphQLErrorPathParam>>,
}

#[derive(Deserialize, Debug)]
pub struct GraphQLErrorLocation {
    line: u32,
    column: u32,
}

#[derive(Deserialize, Debug)]
#[serde(untagged)]
pub enum GraphQLErrorPathParam {
    String(String),
    Number(u32),
}

impl GraphQLError {
    pub fn from_str(message: &str) -> Self {
        Self {
            message: String::from(message),
            json: None,
        }
    }

    pub fn from_json(json: Vec<GraphQLErrorMessage>) -> Self {
        Self {
            message: String::from("Look at json field for more details"),
            json: Some(json),
        }
    }

    pub fn message(&self) -> &str {
        &self.message
    }

    pub fn json(&self) -> &Option<Vec<GraphQLErrorMessage>> {
        &self.json
    }
}

fn format(err: &GraphQLError, f: &mut Formatter<'_>) -> fmt::Result {
    // Print the main error message
    writeln!(f, "\nGQLClient Error: {}", err.message)?;

    // Check if query errors have been received
    if err.json.is_none() {
        return Ok(());
    }

    let errors = err.json.as_ref();

    for err in errors.unwrap() {
        writeln!(f, "Message: {}", err.message)?;
    }

    Ok(())
}

impl fmt::Display for GraphQLError {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        format(self, f)
    }
}

impl fmt::Debug for GraphQLError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        format(&self, f)
    }
}

impl std::convert::From<reqwest::Error> for GraphQLError {
    fn from(error: Error) -> Self {
        Self {
            message: error.to_string(),
            json: None,
        }
    }
}