// use serde::{de::value, Serialize};
use serde_json::{json, Value};
use integr_structs::api::v3::{Metric, MetricOutput};

pub struct JsonParser;

impl JsonParser {
    pub fn parse(targets: &Vec<Metric>, json: &str) -> Vec<MetricOutput> {
        let mut res_vec: Vec<MetricOutput> = Vec::new(); 
        for target in targets {
            let metric = match target.addr.contains("[") {
                true => JsonParser::get_sum_of_metrics_in_array(target, json),
                false => JsonParser::get_metric(target, json),
            };
            res_vec.push(MetricOutput::new_with_slices(&target.id, &target.json_type, &target.addr, metric));
        }  
        res_vec
    }
    fn get_sum_of_metrics_in_array(target: &Metric, json: &str) -> Value {
        if target.addr.is_empty() {
            return Value::Null;
        }

        let mut vec_value: Vec<Value> = Vec::new();
        let mut array_key = String::new();
        let mut value_json: Value = serde_json::from_str(json).unwrap_or(Value::Null);

        let target_attr_vec = target.addr
            .split_terminator('.')
            .collect::<Vec<&str>>();
        // for keys in [] brackets
        let mut key_tag = String::new();

        for (global_idx, &key) in target_attr_vec.iter().enumerate() {
            // if array 
            let key_checked = if key.contains('[') {
                let key_idx = key.find("[").unwrap();
                key_tag = key.chars()
                    .enumerate()
                    .filter(|(idx, chr)| *idx > key_idx && *chr != ']')
                    .map(|(_, chr)| chr)
                    .collect::<String>();
                // dbg!(&key_tag);
                key.chars()
                    .enumerate()
                    .filter(|(idx, _)| *idx < key_idx)
                    .map(|(_, chr)| chr)
                    .collect::<String>()
                // dbg!(value_json.get(&array_key).unwrap_or(&Value::Null));
                // value_json = value_json.get(array_key).unwrap_or(&Value::Null).clone();
                // continue;
                // new_key.as_str()
                // dbg!(key);       APPROVED 
            // TODO: need to check key in [] type of [KEY]
            } else {key.to_owned()};
            
            // if already array 
            match value_json.get(key_checked) {
                Some(val) => {
                    match val {
                        Value::Array(array) => {
                            // form new target array
                            let new_array_target = target_attr_vec
                                .iter()
                                .enumerate()
                                .filter(|(idx, _)| *idx > global_idx)
                                .map(|(_, &chr)| chr.to_owned())
                                .collect::<Vec<String>>();
                            // get_values_in_array
                            // get_tags_in_array
                            // // slice_tags_with_values
                            // dbg!(&array);
                            // dbg!(&new_array_target);
                            let res_arr = Self::get_values_in_array(array, &new_array_target);
                            if &key_tag == "" {
                                return res_arr.into();
                            }
                            return Self::slice_with_tags_in_array(array, &res_arr, &key_tag).into()
                            
                        },
                        _ => value_json = val.clone(),
                    }
                },
                None => return Value::Null,
            }
        }
        value_json
    }

    fn slice_with_tags_in_array(array: &Vec<Value>, metrics: &Vec<Value>, tag_name: &str) -> Vec<Value> {
        if tag_name.is_empty() {
            return metrics.clone();
        }
        // array[0].as_object().unwrap_or(json!(Value::Null))
        let mut values: Vec<Value> = Vec::new();
        array.iter()
            .enumerate()
            .map(|(idx, val)| {
                let val = val.get(tag_name).unwrap_or(&Value::Null).clone();
                (serde_json::from_value::<serde_json::Map<String, Value>>(json!({tag_name: val})), 
                serde_json::from_value::<serde_json::Map<String, Value>>(metrics[idx].clone()))
            })
            .for_each(|(key, val)| {
                // dbg!(&key);
                if key.is_ok() && val.is_ok() {
                    let mut key = key.unwrap();
                    let mut val = val.unwrap();
                    key.append(&mut val);
                    values.push(json!(key));
                }
            });
        if values.len() == 0 {
            return metrics.clone();
        }
        values
    }
    fn get_values_in_array(array: &Vec<Value>, fields: &Vec<String>) -> Vec<Value> {
        let mut values: Vec<Value> = Vec::new();
        for obj in array {
            // dbg!(obj);
            let mut obrez = obj.clone();
            for field in fields {
                obrez = obrez.get(field).unwrap_or(&Value::Null).clone();
                match obrez {
                    Value::Object(_) => {continue},
                    _ => {
                        values.push(json!({field: obrez.clone()}));
                    },
                    // None => {values.push(Value::Null)},
                }
            }
        }
        values
    }

    fn get_metric(target: &Metric, json: &str) -> Value {
        if target.addr.is_empty() {
            return Value::Null;
        }
        let mut value_json: Value = serde_json::from_str(json).unwrap_or(Value::Null);

        let target_attr_vec = target.addr
            .split_terminator('.')
            .collect::<Vec<&str>>();
        for key in target_attr_vec {
            match value_json.get(key) {
                Some(val) => value_json = val.clone(),
                None => return Value::Null,
            }
        }
        value_json    
    }
}