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use serde::{Deserialize, Serialize};
use serde_json::{self, Value};
use std::{
    collections::{hash_map::DefaultHasher, BTreeMap},
    hash::{Hash, Hasher},
};
use std::{
    fs,
    path::{Path, PathBuf},
};

use crate::error::ThermiteError;

#[derive(Serialize, Deserialize, Debug, Clone)]
#[serde(rename_all = "PascalCase")]
pub struct ModJSON {
    name: String,
    description: String,
    version: String,
    load_priotity: i32,
    con_vars: Vec<Value>,
    scripts: Vec<Value>,
    localisation: Vec<String>,
}

#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct Mod {
    pub name: String,
    ///The latest version of the mod
    pub latest: String,
    #[serde(default)]
    pub installed: bool,
    #[serde(default)]
    pub upgradable: bool,
    #[serde(default)]
    pub global: bool,
    ///A map of each version of a mod
    pub versions: BTreeMap<String, ModVersion>,
}

impl Mod {
    pub fn get_latest(&self) -> Option<&ModVersion> {
        self.versions.get(&self.latest)
    }
}

#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct ModVersion {
    pub name: String,
    pub version: String,
    pub url: String,
    pub desc: String,
    pub deps: Vec<String>,
    pub installed: bool,
    pub global: bool,
    pub file_size: u64,
}

impl ModVersion {
    pub fn file_size_string(&self) -> String {
        if self.file_size / 1_000_000 >= 1 {
            let size = self.file_size as f64 / 1_048_576f64;

            format!("{:.2} MB", size)
        } else {
            let size = self.file_size as f64 / 1024f64;
            format!("{:.2} KB", size)
        }
    }
}

#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct Manifest {
    pub name: String,
    pub version_number: String,
    pub website_url: String,
    pub description: String,
    pub dependencies: Vec<String>,
}

// enabledmods.json

#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct EnabledMods {
    #[serde(rename = "Northstar.Client")]
    pub client: bool,
    #[serde(rename = "Northstar.Custom")]
    pub custom: bool,
    #[serde(rename = "Northstar.CustomServers")]
    pub servers: bool,
    #[serde(flatten)]
    pub mods: BTreeMap<String, bool>,
    ///Hash of the file as it was loaded
    #[serde(skip)]
    hash: u64,
    ///Path to the file to read & write
    #[serde(skip)]
    path: Option<PathBuf>,
}

impl Hash for EnabledMods {
    fn hash<H: Hasher>(&self, state: &mut H) {
        self.client.hash(state);
        self.custom.hash(state);
        self.servers.hash(state);
        self.mods.hash(state);
    }
}

impl Default for EnabledMods {
    fn default() -> Self {
        Self {
            client: true,
            custom: true,
            servers: true,
            mods: BTreeMap::new(),
            hash: 0,
            path: None,
        }
    }
}

impl Drop for EnabledMods {
    fn drop(&mut self) {
        if self.path.is_some() {
            let hash = {
                let mut hasher = DefaultHasher::new();
                self.hash(&mut hasher);
                hasher.finish()
            };

            if hash != self.hash {
                self.save().unwrap()
            }
        }
    }
}

impl EnabledMods {
    pub fn save(&self) -> Result<(), ThermiteError> {
        let parsed = serde_json::to_string_pretty(self)?;
        if let Some(path) = &self.path {
            if let Some(p) = path.parent() {
                fs::create_dir_all(p)?;
            }

            fs::write(path, &parsed)?;
        }

        Ok(())
    }

    pub fn save_with_path(&mut self, path: impl AsRef<Path>) -> Result<(), ThermiteError> {
        self.path = Some(path.as_ref().to_owned());
        self.save()
    }
}