use std::fmt::Debug;

use chrono::{Datelike, NaiveDate};
use itertools::Itertools;
use polars::prelude::*;
use reqwest;
use std::env;
use std::time::Duration;

use csv;

pub mod send_mail_util;
pub mod zip_directory_util;

#[derive(Debug, serde::Deserialize)]
struct CsvHeader {
    CATEGORIA: String,
    PONTOS: Option<u8>,
}

#[derive(Debug, serde::Deserialize)]
struct CsvEvaluation {
    APRESENTAÇÃO: u8,
    CONFIRMAÇÃO_DE_EMAIL: u8,
    CONFIRMAÇÃO_DE_TELEFONE: u8,
    PROTOCOLO: u8,
    USO_DO_PORTUGUÊS: u8,
    PACIÊNCIA_E_EDUCAÇÃO: u8,
    DISPONIBILIDADE: u8,
    ESCLARECIMENTO: u8,
    ID_TALK: String,
}

// --- ADICAO PARA AGRUPAR O response_time.csv ---
#[derive(Debug, serde::Deserialize)]
struct ResponseTimeRecord {
    NOME: String,
    ID_TALK: String,
    #[serde(rename = "TEMPO DE RESPOSTA")]
    TEMPO_DE_RESPOSTA: u32,
    #[serde(rename = "TRANFERENCIA PELO BOT")]
    TRANFERENCIA_PELO_BOT: String,
    #[serde(rename = "PRIMEIRA RESPOSTA DO AGENTE")]
    PRIMEIRA_RESPOSTA_DO_AGENTE: String,
}
// --- FIM DA ADIÇÃO ---

fn main() {
    match dotenv::dotenv().ok() {
        Some(_) => println!("Environment variables loaded from .env file"),
        None => eprintln!("Failed to load .env file, using defaults"),
    }

    // Read environment variables
    let OLLAMA_URL = env::var("OLLAMA_URL").unwrap_or("localhost".to_string());
    let OLLAMA_PORT = env::var("OLLAMA_PORT")
        .unwrap_or("11432".to_string())
        .parse::<u16>()
        .unwrap_or(11432);
    let OLLAMA_AI_MODEL_DATA_SANITIZATION = env::var("OLLAMA_AI_MODEL_DATA_SANITIZATION")
        .expect("Missing environment variable OLLAMA_AI_MODEL_DATA_SANITIZATION");
    let BOT_EMAIL = env::var("BOT_EMAIL").expect("BOT_EMAIL has not been set!");
    let BOT_EMAIL_PASSWORD =
        env::var("BOT_EMAIL_PASSWORD").expect("BOT_EMAIL_PASSWORD has not been set!");

    let ip_address = ipaddress::IPAddress::parse(OLLAMA_URL.to_string());
    let OLLAMA_SANITIZED_IP = match ip_address {
        Ok(ip) => {
            if ip.is_ipv4() {
                OLLAMA_URL.clone()
            } else {
                format!("[{}]", OLLAMA_URL.clone())
            }
        }
        Err(e) => OLLAMA_URL.clone(),
    };

    // Get the current day in the format YYYY-MM-DD
    let current_date = chrono::Local::now();
    let formatted_date = current_date.format("%Y-%m-%d").to_string();

    let current_date = chrono::Local::now();
    // let first_day_of_current_month = NaiveDate::fro

    let current_day_of_last_month = current_date
        .checked_sub_months(chrono::Months::new(1))
        .expect("Failed to subtract one month");

    let first_day_of_last_month = NaiveDate::from_ymd_opt(
        current_day_of_last_month.year(),
        current_day_of_last_month.month(),
        1,
    )
    .expect("Failed to obtain date");
    let last_day_of_last_month = NaiveDate::from_ymd_opt(
        current_day_of_last_month.year(),
        current_day_of_last_month.month(),
        current_day_of_last_month.num_days_in_month() as u32,
    )
    .expect("Failed to obtain date");

    let previous_month_folder_names = std::fs::read_dir(std::path::Path::new("./evaluations"))
        .expect("Failed to read directory ./evaluations")
        .filter_map_ok(|entry| {
            if entry.metadata().unwrap().is_dir() {
                Some(entry.file_name())
            } else {
                None
            }
        })
        .filter_map_ok(|entry_string_name| {
            let regex_match_date =
                regex::Regex::new(r"(\d{4}-\d{2}-\d{2})").expect("Failed to build regex");

            let filename = entry_string_name.to_str().unwrap();
            let matches_find = regex_match_date.find(filename);

            match matches_find {
                Some(found) => {
                    let date = chrono::NaiveDate::parse_from_str(found.as_str(), "%Y-%m-%d");
                    return Some((date.unwrap(), entry_string_name));
                }
                None => {
                    return None;
                }
            };
        })
        .filter_map_ok(|(folder_name_date, directory_string)| {
            if folder_name_date.year() == first_day_of_last_month.year()
                && folder_name_date.month() == first_day_of_last_month.month()
            {
                return Some(directory_string);
            }
            return None;
        })
        .filter_map(|value| {
            if value.is_ok() {
                return Some(value.unwrap());
            } else {
                return None;
            }
        })
        .sorted()
        .collect_vec();

    println!("{:?}", previous_month_folder_names);

    let prompt_data_sanitization = std::fs::read_to_string("./PROMPT_DATA_SANITIZATION.txt")
        .expect("Failed to read PROMPT_DATA_SANITIZATION.txt");
    let client = reqwest::blocking::Client::new();

    let groupped_values = previous_month_folder_names
        .iter()
        .map(|folder_name| {
            let folder_base_path = std::path::Path::new("./evaluations");
            let folder_date_path = folder_base_path.join(folder_name);
            std::fs::read_dir(folder_date_path)
        })
        .filter_map_ok(|files_inside_folder_on_date| {
            let groupped_by_user_on_day = files_inside_folder_on_date
                .filter_ok(|entry| {
                    let entry_file_name_as_str = entry
                        .file_name()
                        .into_string()
                        .expect("Failed to get filename as a String");

                    entry_file_name_as_str.ends_with(".csv")
                        && !entry_file_name_as_str.contains("response_time.csv")
                })
                .filter_map(|value| {
                    if value.is_ok() {
                        return Some(value.unwrap());
                    }
                    None
                })
                .map(|file_name_csv| {
                    println!("{:?}", file_name_csv.path());
                    let file_contents = std::fs::read_to_string(file_name_csv.path())
                        .expect("Failed to read CSV file");

                    let ollama_api_request = client
                        .post(format!(
                            "http://{OLLAMA_SANITIZED_IP}:{OLLAMA_PORT}/api/generate"
                        ))
                        .body(
                            serde_json::json!({
                                "model": OLLAMA_AI_MODEL_DATA_SANITIZATION,
                                "prompt": format!("{prompt_data_sanitization} \n{file_contents}"),
                                "temperature": 0.0, // Get predictable and reproducible output
                                "stream": false,
                            })
                            .to_string(),
                        );

                    let result = ollama_api_request.timeout(Duration::from_secs(3600)).send();

                    match result {
                        Ok(response) => {
                            println!("Response: {:?}", response);
                            let response_json = response
                                .json::<serde_json::Value>()
                                .expect("Failed to deserialize response to JSON");
                            let ai_response = response_json["response"]
                                .as_str()
                                .expect("Failed to get AI response as string");

                            let ai_response = ai_response.to_string();

                            let ai_response = if let Some(resp) = ai_response
                                .strip_prefix(" ")
                                .unwrap_or(&ai_response)
                                .strip_prefix("```csv\n")
                            {
                                resp.to_string()
                            } else {
                                ai_response
                            };
                            let ai_response = if let Some(resp) = ai_response
                                .strip_suffix(" ")
                                .unwrap_or(&ai_response)
                                .strip_suffix("```")
                            {
                                resp.to_string()
                            } else {
                                ai_response
                            };

                            return Ok((ai_response, file_name_csv));
                        }
                        Err(error) => {
                            println!("Error {error}");
                            return Err(error);
                        }
                    };
                })
                .filter_map_ok(|(ai_repsonse, file_path_csv)| {
                    let mut reader = csv::ReaderBuilder::new()
                        .has_headers(true)
                        .delimiter(b';')
                        .from_reader(ai_repsonse.as_bytes());

                    let mut deserialized_iter = reader.deserialize::<CsvHeader>();

                    let mut columns = deserialized_iter
                        .filter_ok(|value| value.PONTOS.is_some())
                        .map_ok(|value| {
                            let col =
                                Column::new(value.CATEGORIA.into(), [value.PONTOS.unwrap() as u32]);
                            col
                        })
                        .filter_map(|value| {
                            if value.is_ok() {
                                return Some(value.unwrap());
                            }
                            None
                        })
                        .collect_vec();

                    if columns.len() != 8 {
                        return None;
                    }

                    // Parse id talk from file_path
                    // filename example is: CC - Erraoander Quintana - 515578 - 20251020515578.csv
                    // id talk is the last information, so in the example is: 20251020515578
                    let regex_filename =
                       // regex::Regex::new(r"(FIN - )((\w+\s*)+) - (\d+) - (\d+).csv").unwrap();
			regex::Regex::new(r"FIN - (.+?) - (\d+) - (\d+)\.csv").unwrap();

                    let filename = file_path_csv
                        .file_name()
                        .into_string()
                        .expect("Failed to convert file name as Rust &str");
                    let found_regex_groups_in_filename = regex_filename
                        .captures(filename.as_str())
                        .expect("Failed to do regex capture");

                    let user_name = found_regex_groups_in_filename
                        .get(1)
                        .expect("Failed to get the id from regex maches");
                    let talk_id = found_regex_groups_in_filename
                        .get(3)
                        .expect("Failed to get the id from regex maches");

                    let excelence_percentual = columns
                        .iter()
                        .map(|col| col.as_materialized_series().u32().unwrap().sum().unwrap())
                        .sum::<u32>() as f32
                        / columns.iter().len() as f32
                        * 100.0;
                    columns.push(Column::new(
                        "PERCENTUAL DE EXELENCIA".into(),
                        [format!("{excelence_percentual:.2}")],
                    ));

                    columns.push(Column::new("ID_TALK".into(), [talk_id.clone().as_str()]));

                    let df = polars::frame::DataFrame::new(columns)
                        .expect("Failed to concatenate into a dataframe");

                    // return a tuple with the dataframe and the user name, so it can be correctly merged after
                    return Some((user_name.as_str().to_owned(), df));
                })
                .filter_map(|res| {
                    if res.is_ok() {
                        return Some(res.unwrap());
                    }
                    return None;
                })
                .into_group_map()
                .into_iter()
                .map(|(name, eval_dataframe_vec)| {
                    let groupped_df = eval_dataframe_vec
                        .iter()
                        .cloned()
                        .reduce(|acc, e| acc.vstack(&e).unwrap())
                        .expect("Failed to concatenate dataframes");
                    (name, groupped_df)
                })
                .into_group_map();

            dbg!(&groupped_by_user_on_day);
            return Some(groupped_by_user_on_day);
        })
        .filter_map(|res| {
            if res.is_ok() {
                return Some(res.unwrap());
            }
            return None;
        })
        .reduce(|mut acc, mut e| {
            e.iter_mut().for_each(|(key, val)| {
                if acc.contains_key(key) {
                    acc.get_mut(key)
                        .expect("Failed to obtain key that should already be present")
                        .append(val);
                } else {
                    acc.insert(key.to_owned(), val.to_owned());
                }
            });
            acc
        })
        .and_then(|groupped_hashmap_df| {
            let result = groupped_hashmap_df
                .iter()
                .map(|(key, val)| {
                    let dfs = val
                        .iter()
                        .cloned()
                        .reduce(|acc, e| acc.vstack(&e).unwrap())
                        .expect("Failed to concatenate dataframes");
                    (key.clone(), dfs)
                })
                .collect_vec();
            return Some(result);
        });

    // Setup groupped folder
    if !std::fs::exists(format!("./groupped/")).unwrap() {
        std::fs::create_dir(format!("./groupped")).expect("Failed to create directory")
    }

    // Setup previous week folder
    if !std::fs::exists(format!("./groupped/{first_day_of_last_month}")).unwrap() {
        std::fs::create_dir(format!("./groupped/{first_day_of_last_month}"))
            .expect("Failed to create directory")
    }

    match groupped_values {
        Some(mut val) => {
            val.iter_mut().for_each(|(agent, groupped_evaluations)| {
                let mut save_file_csv = std::fs::File::create(format!(
                    "./groupped/{first_day_of_last_month}/{agent}.csv"
                ))
                .expect("Could not create csv file for saving");
                CsvWriter::new(&mut save_file_csv)
                    .include_header(true)
                    .with_separator(b';')
                    .finish(groupped_evaluations)
                    .expect("Failed to save Groupped DataFrame to CSV File");
            });
        }
        None => {}
    }

// --- ADICAO DO PROCESSAMENTO MENSAL DO response_time.csv ---
	let response_times_data = previous_month_folder_names
	    .iter()
	    .map(|folder_name| {
	        let folder_base_path = std::path::Path::new("./evaluations");
	        let folder_date_path = folder_base_path.join(folder_name);
	        std::fs::read_dir(folder_date_path)
	    })
	    .filter_map_ok(|files_inside_folder_on_date| {
	        let response_time_files = files_inside_folder_on_date
	            .filter_ok(|entry| {
	                let entry_file_name_as_str = entry
	                    .file_name()
	                    .into_string()
	                    .expect("Failed to get filename as a String");
	
	                entry_file_name_as_str.ends_with("response_time.csv")
	            })
	            .filter_map(|value| {
	                if value.is_ok() {
	                    return Some(value.unwrap());
	                }
	                None
	            })
	            .map(|file_path| {
	                println!("Processing response time file: {:?}", file_path.path());
	                
	                let mut rdr = csv::ReaderBuilder::new()
	                    .delimiter(b';')
	                    .has_headers(true)
	                    .from_reader(std::fs::File::open(file_path.path()).unwrap());
	
	                let records: Vec<ResponseTimeRecord> = rdr
	                    .deserialize()
	                    .filter_map(Result::ok)
	                    .collect();
	
	                records
	            })
	            .flat_map(|records| records)
	            .collect_vec();
	
	        Some(response_time_files)
	    })
	    .filter_map(|res| {
	        if res.is_ok() {
	            return Some(res.unwrap());
	        }
	        return None;
	    })
	    .flat_map(|records| records)
	    .collect_vec();
	
	// Salvar response times consolidados do mês
	if !response_times_data.is_empty() {
	    let response_time_file_path = format!(
	        "./groupped/{first_day_of_last_month}/response_times_consolidated_{first_day_of_last_month}.csv"
	    );
	    
	    let mut wtr = csv::WriterBuilder::new()
	        .delimiter(b';')
	        .from_path(&response_time_file_path)
	        .expect("Failed to create response times CSV");
	
	    // Escrever cabeçalho
	    wtr.write_record(&["NOME", "ID_TALK", "TEMPO DE RESPOSTA", "TRANFERENCIA PELO BOT", "PRIMEIRA RESPOSTA DO AGENTE"])
	        .expect("Failed to write header");
	
	    for record in &response_times_data {
	        wtr.write_record(&[
	            &record.NOME,
	            &record.ID_TALK,
	            &record.TEMPO_DE_RESPOSTA.to_string(),
	            &record.TRANFERENCIA_PELO_BOT,
	            &record.PRIMEIRA_RESPOSTA_DO_AGENTE,
	        ]).expect("Failed to write record");
	    }
	
	    wtr.flush().expect("Failed to flush writer");
	    
	    // Calcular estatísticas mensais
	    let total_records = response_times_data.len();
	    let avg_response_time = response_times_data.iter()
	        .map(|r| r.TEMPO_DE_RESPOSTA)
	        .sum::<u32>() as f32 / total_records as f32;
	    
	    let min_response_time = response_times_data.iter()
	        .map(|r| r.TEMPO_DE_RESPOSTA)
	        .min()
	        .unwrap_or(0);
	    
	    let max_response_time = response_times_data.iter()
	        .map(|r| r.TEMPO_DE_RESPOSTA)
	        .max()
	        .unwrap_or(0);
	
	    println!("Response times consolidated successfully for month {}!", first_day_of_last_month);
	    println!("Total records: {}", total_records);
	    println!("Average response time: {:.2} seconds", avg_response_time);
	    println!("Min response time: {} seconds", min_response_time);
	    println!("Max response time: {} seconds", max_response_time);
	} else {
	    println!("No response time data found for the month {}.", first_day_of_last_month);
	}
// --- FIM DA ADIÇÃO ---

    zip_directory_util::zip_directory_util::zip_source_dir_to_dst_file(
        std::path::Path::new(&format!("./groupped/{first_day_of_last_month}")),
        std::path::Path::new(&format!("./groupped/{first_day_of_last_month}.zip")),
    );

    let recipients = "Wilson da Conceição Oliveira <wilson.oliveira@nova.net.br>, nicolas.borges@nova.net.br";
    println!("Trying to send mail... {recipients}");
    send_mail_util::send_mail_util::send_email(
        &format!("Relatório agrupado dos atendimentos da fila do Financeiro N2 do mês {first_day_of_last_month}"),
        &BOT_EMAIL,
        &BOT_EMAIL_PASSWORD,
        recipients,
        &format!("./groupped/{first_day_of_last_month}.zip"),
    );
}