use std::io::{BufRead, BufReader};

pub const LETTERS: &str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

#[derive(Clone, Debug, Default)]
pub struct NumberParser {
    pub filepath: String,
}

impl NumberParser {
    pub fn file_dump(&self) -> Result<Vec<textsender_models::contact::Contact>, std::io::Error> {
        println!("Dumping files");
        let mut objs: Vec<textsender_models::contact::Contact> = Vec::new();

        match self.read_lines(&self.filepath) {
            Ok(lines) => {
                for line in lines {
                    let contains_letters = line.chars().any(|c| LETTERS.contains(c));
                    if contains_letters {
                        continue;
                    } else {
                        let my_obj = textsender_models::contact::Contact {
                            phone_number: line.clone(),
                            ..Default::default()
                        };
                        if !my_obj.phone_number.is_empty() {
                            objs.push(my_obj);
                        }
                    }
                }

                let updated_contacts = self.update_contacts(&objs);
                let removed_duplicates = self.remove_dups(&updated_contacts);

                Ok(removed_duplicates)
            }
            Err(err) => {
                Err(err)
            }
        }
    }

    pub fn save_file(&self, numbers: Vec<textsender_models::contact::Contact>) {
    }

    pub fn print_values(&self, numbers: &Vec<textsender_models::contact::Contact>) {
        println!("Printing numbers");

        for number in numbers {
            println!("Number: {number:?}");
        }

        println!("Total numbers: {:?}", numbers.len());
    }

    fn read_lines(&self, filename: &String) -> Result<Vec<String>, std::io::Error> {
        match std::fs::File::open(filename) {
            Ok(file) => {
                let reader = std::io::BufReader::new(file);
                reader.lines().collect()
            }
            Err(err) => {
                Err(err)
            }
        }
    }

    fn remove_dups(&self, contacts: &Vec<textsender_models::contact::Contact>) -> Vec<textsender_models::contact::Contact> {
        let mut unique_contacts: Vec<textsender_models::contact::Contact> = Vec::new();
        let mut unique_items = std::collections::HashSet::new();

        for val in contacts {
            unique_items.insert(val.phone_number.clone());
        }

        for unique_item in unique_items {
            let contact = textsender_models::contact::Contact {
                phone_number: unique_item,
                ..Default::default()
            };
            unique_contacts.push(contact);
        }

        unique_contacts
    }

    fn add_prefix(&self, raw: &String) -> String {
        let mut parsed: String = String::new();
        let first_char = raw.chars().nth(0).unwrap();
        let second_char = raw.chars().nth(1).unwrap();

        if first_char == '1' {
            parsed = format!("+{raw}");
        } else if first_char != '+' {
            if second_char != '1' {
                parsed = format!("+1{raw}");
            } else {
                parsed = format!("+1{raw}");
            }
        }

        parsed
    }

    fn remove_some_data(&self, unparsed: &String) -> String {
        let mut parsed: String = String::new();

        for (_, ch) in unparsed.chars().enumerate() {
            if ch == ' ' {
                continue;
            } else {
                if ch.is_numeric() {
                    parsed.push(ch);
                }
            }
        }

        println!("Parsed: {parsed:?}");

        parsed
    }
}


/*
func (prsr *NumberParser) FileDump() []contact.Contact {
	log.Println("Dumping files")
	objs := []contact.Contact{}

	for _, line := range prsr.readLines(prsr.FilePath) {
		if strings.ContainsAny(line, Letters) {
			continue
		}

		myObj := contact.Contact{PhoneNumber: line}
		if myObj.PhoneNumber != "" {
			objs = append(objs, myObj)
		}
	}

	objs = prsr.updateContacts(objs)
	objs = prsr.removeDups(objs)

	return objs
}

func (prsr *NumberParser) updateContacts(contacts []contact.Contact) []contact.Contact {
	updated := []contact.Contact{}

	for _, ct := range contacts {
		parsed := ct.PhoneNumber
		if len(parsed) < 2 {
			log.Println("Invalid number:", parsed)
			continue
		}

		pars := prsr.removeSomeData(parsed)
		parsed = pars

		log.Println("Parsed:", parsed)

		updatedParsed := prsr.addPrefix(parsed)
		updated = append(updated, contact.Contact{PhoneNumber: updatedParsed})
	}

	return updated
}


func (prsr NumberParser) SaveFile(vals []contact.Contact) {
	filename := "numbers.json"

	// Create json and save it to the filesystem
	jsonData, err := json.MarshalIndent(&vals, "", "  ")
	if err != nil {
		log.Println("Error marshaling JSON:", err)
		return
	}

	err = os.WriteFile(filename, jsonData, 0644)
	if err != nil {
		log.Println("Error writing file:", err)
		return
	}
}
*/