use crate::route::Router;
use dict_derive::IntoPyObject;
use pyo3::conversion::ToPyObject;
use pyo3::prelude::*;
use pyo3::types::{PyDict, PyTuple};
use serde::{Deserialize, Serialize};
use std::cmp::Ordering;
use std::collections::HashMap;
use std::path::PathBuf;

pub fn get_fsd_booster_info(class: usize) -> Result<f32, String> {
    // Data from https://elite-dangerous.fandom.com/wiki/Guardian_Frame_Shift_Drive_Booster
    let ret = match class {
        0 => 0.0,
        1 => 4.0,
        2 => 6.0,
        3 => 7.75,
        4 => 9.25,
        5 => 10.5,
        _ => return Err(format!("Invalid Guardian booster class: {}", class)),
    };
    return Ok(ret);
}

pub fn get_fsd_info(rating: usize, class: usize) -> Result<HashMap<String, f32>, String> {
    let mut ret = HashMap::new();
    // Data from https://elite-dangerous.fandom.com/wiki/Frame_Shift_Drive#Specifications
    let (opt_mass, max_fuel) = match (class, rating) {
        (2, 1) => (48.0, 0.6),
        (2, 2) => (54.0, 0.6),
        (2, 3) => (60.0, 0.6),
        (2, 4) => (75.0, 0.8),
        (2, 5) => (90.0, 0.9),

        (3, 1) => (80.0, 1.2),
        (3, 2) => (90.0, 1.2),
        (3, 3) => (100.0, 1.2),
        (3, 4) => (125.0, 1.5),
        (3, 5) => (150.0, 1.8),

        (4, 1) => (280.0, 2.0),
        (4, 2) => (315.0, 2.0),
        (4, 3) => (350.0, 2.0),
        (4, 4) => (438.0, 2.5),
        (4, 5) => (525.0, 3.0),

        (5, 1) => (560.0, 3.3),
        (5, 2) => (630.0, 3.3),
        (5, 3) => (700.0, 3.3),
        (5, 4) => (875.0, 4.1),
        (5, 5) => (1050.0, 5.0),

        (6, 1) => (960.0, 5.3),
        (6, 2) => (1080.0, 5.3),
        (6, 3) => (1200.0, 5.3),
        (6, 4) => (1500.0, 6.6),
        (6, 5) => (1800.0, 8.0),

        (7, 1) => (1440.0, 8.5),
        (7, 2) => (1620.0, 8.5),
        (7, 3) => (1800.0, 8.5),
        (7, 4) => (2250.0, 10.6),
        (7, 5) => (2700.0, 12.8),
        (r, c) => return Err(format!("Invalid FSD Type: Rating: {}, Class: {}", r, c)),
    };
    ret.insert("FSDOptimalMass".to_owned(), opt_mass);
    ret.insert("MaxFuel".to_owned(), max_fuel);
    return Ok(ret);
}

pub fn get_mult(star_type: &str) -> f32 {
    if star_type.contains("White Dwarf") {
        return 1.5;
    }
    if star_type.contains("Neutron") {
        return 4.0;
    }
    1.0
}

pub enum SysEntry {
    ID(u32),
    Name(String),
}

impl SysEntry {
    pub fn parse(s: &str) -> Self {
        if let Ok(n) = s.parse() {
            SysEntry::ID(n)
        } else {
            SysEntry::Name(s.to_owned())
        }
    }
}

pub fn find_matches(
    path: &PathBuf,
    names: Vec<String>,
    exact: bool,
) -> Result<HashMap<String, (f64, Option<System>)>, String> {
    let mut best: HashMap<String, (f64, Option<System>)> = HashMap::new();
    if names.is_empty() {
        return Ok(best);
    }
    for name in &names {
        best.insert(name.to_string(), (0.0, None));
    }
    let mut reader = match csv::ReaderBuilder::new().from_path(path) {
        Ok(rdr) => rdr,
        Err(e) => {
            return Err(format!("Error opening {}: {}", path.to_str().unwrap(), e));
        }
    };
    let systems = reader.deserialize::<SystemSerde>();
    for sys in systems {
        let sys = sys.unwrap();
        for name in &names {
            best.entry(name.clone()).and_modify(|ent| {
                if (exact) && (&sys.system == name) {
                    *ent = (1.0, Some(sys.clone().build()))
                } else {
                    let d1 = strsim::normalized_levenshtein(&sys.system, &name);
                    let d2 = strsim::normalized_levenshtein(&sys.body, &name);
                    if d1 > ent.0 {
                        *ent = (d1, Some(sys.clone().build()))
                    } else if d2 > ent.0 {
                        *ent = (d2, Some(sys.clone().build()))
                    }
                }
            });
        }
    }
    Ok(best)
}

#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
pub struct TreeNode {
    pub id: u32,
    pub pos: [f32; 3],
    pub mult: f32,
}

impl TreeNode {
    pub fn get(&self, router: &Router) -> Option<System> {
        let mut cache = router.cache.as_ref().unwrap().lock().unwrap();
        cache.get(self.id)
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, IntoPyObject)]
pub struct SystemSerde {
    pub id: u32,
    pub star_type: String,
    pub system: String,
    pub body: String,
    pub mult: f32,
    pub distance: f32,
    pub x: f32,
    pub y: f32,
    pub z: f32,
}

impl SystemSerde {
    pub fn build(self) -> System {
        System {
            id: self.id,
            star_type: self.star_type,
            system: self.system,
            body: self.body,
            mult: self.mult,
            distance: self.distance,
            pos: [self.x, self.y, self.z],
        }
    }

    pub fn to_node(&self) -> TreeNode {
        TreeNode {
            id: self.id,
            pos: [self.x, self.y, self.z],
            mult: self.mult,
        }
    }
}

#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct System {
    pub id: u32,
    pub star_type: String,
    pub system: String,
    pub body: String,
    pub mult: f32,
    pub distance: f32,
    pub pos: [f32; 3],
}

impl ToPyObject for System {
    fn to_object(&self, py: Python) -> PyObject {
        let pos = PyTuple::new(py, self.pos.iter());
        let elem = PyDict::new(py);
        elem.set_item("star_type", self.star_type.clone()).unwrap();
        elem.set_item("system", self.system.clone()).unwrap();
        elem.set_item("body", self.body.clone()).unwrap();
        elem.set_item("distance", self.distance).unwrap();
        elem.set_item("mult", self.mult).unwrap();
        elem.set_item("id", self.id).unwrap();
        elem.set_item("pos", pos).unwrap();
        elem.to_object(py)
    }
}

impl System {
    pub fn to_node(&self) -> TreeNode {
        TreeNode {
            id: self.id,
            pos: self.pos,
            mult: self.mult,
        }
    }
}

impl Ord for System {
    fn cmp(&self, other: &Self) -> Ordering {
        self.id.cmp(&other.id)
    }
}

impl PartialOrd for System {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}