use sqlx::mysql::MySqlPoolOptions;
use sqlx::mysql::MySqlPool;


use dotenvy::dotenv_override;
use std::collections::HashMap;
use std::env;
// use crate::schema::equipment::dsl::*;
// use crate::schema::worker::dsl::*;
use crate::models::*;
use anyhow::anyhow;

pub struct DBOperator{
    pool: MySqlPool,
}
impl DBOperator{
    pub async fn new() -> Self{
        dotenv_override().ok();
        let db_url = env::var("DATABASE_URL").expect("DATABASE_URL установи!");
        Self{pool: MySqlPool::connect(&db_url).await.unwrap()}
    
    }
    pub async fn get_position(&self) -> Result<Vec<Position>, sqlx::Error>{
        let rets: Vec<Position> = sqlx::query_as:: <_, Position>("SELECT * FROM `position`").fetch_all(&self.pool).await?;
        Ok(rets)
    }
    pub async fn get_workers(&self) -> Result<Vec<Worker>, sqlx::Error>{
        let pre_rets: Vec<WorkerRow> = sqlx::query_as::<_, WorkerRow>("SELECT * FROM `worker`").fetch_all(&self.pool).await?;
        let mut rets:Vec<Worker> = Vec::new();
        let pos = self.get_position().await.unwrap();
        for worker in pre_rets{
            let mut ppos = Position::default();
            for position in pos.clone(){
                if position.id == worker.position_id{
                    ppos = position.clone();
                    break;
                }
            }
            rets.push(Worker{ id: worker.id, full_name: worker.full_name, hire_date: worker.hire_date, position: ppos, is_fired: worker.is_fired });
        }
        Ok(rets)
    }
    pub async fn get_equipment(&self) -> Result<Vec<Equipment>,sqlx::Error>{
        let pre_rets = sqlx::query_as::<_, EquipmentRow>("SELECT * FROM `equipment`").fetch_all(&self.pool).await?;
        let mut rets: Vec<Equipment> = Vec::new();
        let workers = self.get_workers().await?;
        for eq in pre_rets{
            let mut pworker = Worker::default();
            for worker in workers.clone(){
                if worker.id == eq.worker_id{
                    pworker = worker.clone();
                    break;
                }
            }
            rets.push(Equipment { id: eq.id, name: eq.name, inv_number: eq.inv_number, maintenance_date: eq.maintenance_date, worker: pworker });
        }
        Ok(rets)
    }
    pub async fn get_mcat(&self) -> Result<Vec<MaterialCategory>,sqlx::Error>{
        let rets = sqlx::query_as::<_, MaterialCategory>("SELECT * FROM `material_category`").fetch_all(&self.pool).await?;
        Ok(rets)
    }
    pub async fn get_materials(&self) -> Result<Vec<Material>, sqlx::Error>{
        let mats = sqlx::query_as::<_,MaterialRow>("SELECT * FROM `material`").fetch_all(&self.pool).await?;
        let cats = self.get_mcat().await?;
        let cat_map : HashMap<_, MaterialCategory> = cats
        .into_iter()
        .map(|cat| (cat.id, cat))
        .collect();
        let mut rets = Vec::with_capacity(mats.len());
        for mat in mats{
            let cat = cat_map
            .get(&mat.category_id)
            .expect("Никто не знает как, но БД не смогла связать материал с его категорией. Заставьте разраба это починить.")
            .clone();
            rets.push(Material{
                id: mat.id,
                name: mat.name,
                quantity: mat.quantity,
                category: cat,
            });
        }
        Ok(rets)
        
    }
    pub async fn check_worker(&self, worker: Worker) -> Result<bool, sqlx::Error>{
        let ret = sqlx::query(&format!("SELECT * FROM `worker` WHERE full_name = {}, position_id = {}, hire_date = {}", worker.full_name, worker.position.id, worker.hire_date.to_string())).fetch_all(&self.pool).await?;
        if ret.len() > 0{
            return Ok(true)
        }
        Ok(false)
    }
    pub async fn add_worker(&self, worker: Worker) -> Result<bool,sqlx::Error>{
        // sqlx::query!("INSERT INTO Brewery.worker (id, position_id, hire_date, is_fired, full_name) VALUES(0, ?, ?, ?, ?);",worker.position.id, worker.hire_date ,worker.is_fired,worker.full_name)
        match sqlx::query("INSERT INTO Brewery.worker (id, position_id, hire_date, is_fired, full_name) VALUES(0, ?, ?, ?, ?);")
        .bind(worker.position.id)
        .bind(worker.hire_date)
        .bind(worker.is_fired)
        .bind(worker.full_name)
        .execute(&self.pool)
        .await {
            Ok(_) =>{
                return Ok(true)
            },
            Err(_) =>{
                Ok(false)
            }
        }
    }
    pub async fn add_position(&self, position: Position) -> Result<bool,sqlx::Error>{
        match sqlx::query("INSERT INTO Brewery.`position` (id, name, wage) VALUES(0, ?, ?);")
        .bind(position.name)
        .bind(position.wage)
        .execute(&self.pool)
        .await{
            Ok(_)=>{
                Ok(true)
            },
            Err(_)=>{
                Ok(false)
            }
        }
    }
    pub async fn add_material_category(&self, mat_cat: MaterialCategory) -> Result<bool, sqlx::Error>{
        match sqlx::query("INSERT INTO Brewery.`material_category` (id, name) VALUES (0, ?)")
        .bind(mat_cat.name)
        .execute(&self.pool)
        .await{
            Ok(_)=>{
                Ok(true)
            },
            Err(_)=>{
                Ok(false)
            }
        }
    }
    pub async fn add_material(&self, mat: MaterialRow) -> Result<bool, sqlx::Error>{
        match sqlx::query("INSERT INTO Brewery.material (id, name, quantity, category_id) VALUES(0, ?, ?, ?);")
        .bind(mat.name)
        .bind(mat.quantity)
        .bind(mat.category_id)
        .execute(&self.pool)
        .await{
            Ok(_)=>{
                Ok(true)
            },
            Err(_)=>{
                Ok(false)
            }
        }
    }
    pub async fn delete_position(&self, position: Position) -> Result<bool,sqlx::Error>{
        match sqlx::query("DELETE FROM Brewery.`position` WHERE id = ?;")
        .bind(position.id)
        .execute(&self.pool)
        .await{
            Ok(_)=>{
                Ok(true)
            },
            Err(_)=>{
                Ok(false)
            }
        }
    }
    pub async fn delete_material_category(&self, mat_cat: MaterialCategory) -> Result<bool,sqlx::Error>{
        match sqlx::query("DELETE FROM Brewery.`material_category` WHERE id = ?;")
        .bind(mat_cat.id)
        .execute(&self.pool)
        .await{
            Ok(_) =>{
                Ok(true)
            },
            Err(_)=>{
                Ok(false)
            }
        }
    }
    pub async fn delete_material(&self, mat: MaterialRow) -> Result<bool, sqlx::Error>{
        match sqlx::query("DELETE FROM Brewery.`material` WHERE id = ?;")
        .bind(mat.id)
        .execute(&self.pool)
        .await{
            Ok(_) =>{
                Ok(true)
            },
            Err(_)=>{
                Ok(false)
            }
        }
    }

    pub async fn update_worker(&self, worker: Worker) -> Result<bool, sqlx::Error>{
        match sqlx::query("UPDATE Brewery.worker SET position_id=?, hire_date=?, is_fired=?, full_name=? WHERE id=?;")
        .bind(worker.position.id)
        .bind(worker.hire_date)
        .bind(worker.is_fired)
        .bind(worker.full_name)
        .bind(worker.id)
        .execute(&self.pool)
        .await{
            Ok(_) =>{
                Ok(true)
            },
            Err(_)=>{
                Ok(false)
            }
        }
    }
    pub async fn update_material_category(&self, mat_cat: MaterialCategory) -> Result<bool, sqlx::Error>{
        match sqlx::query("UPDATE Brewery.`material_category` SET name=? WHERE id=?;")
        .bind(mat_cat.name)
        .bind(mat_cat.id)
        .execute(&self.pool)
        .await{
            Ok(_) =>{
                Ok(true)
            },
            Err(_)=>{
                Ok(false)
            }
        }
    }
    pub async fn update_material(&self, mat: MaterialRow) -> Result<bool, sqlx::Error>{
        match sqlx::query("UPDATE Brewery.material SET name=?, quantity=?, category_id=? WHERE id=?;")
        .bind(mat.name)
        .bind(mat.quantity)
        .bind(mat.category_id)
        .bind(mat.id)
        .execute(&self.pool)
        .await{
            Ok(_) =>{
                Ok(true)
            },
            Err(_)=>{
                Ok(false)
            }
        }
    }
    pub async fn get_worker_by_id(&self, worker_id:i32) -> Result<Worker, sqlx::Error>{
        let preret = sqlx::query_as::<_, WorkerRow>("SELECT * FROM `worker` WHERE id = ?;").bind(worker_id).fetch_all(&self.pool).await?;
        let poses = self.get_position().await?;
        let ret = Ok(Worker{
            id: preret[0].id,
            full_name: preret[0].full_name.clone(),
            hire_date: preret[0].hire_date,
            is_fired: preret[0].is_fired,
            position: poses.iter().find(|&pos| &pos.id == &preret[0].position_id).unwrap().clone(),

        });
    ret
    }


}






pub async fn estabilish_connection() -> Result<(), sqlx::Error>{
    dotenv_override().ok();
    let db_url = env::var("DATABASE_URL").expect("DATABASE_URL установи!");
    let _pool = MySqlPoolOptions::new()
        .max_connections(5)
        .connect(&db_url).await?;

    Ok(())
}