// SPDX-FileCopyrightText: 2023 Joshua Goins <josh@redstrate.com>
// SPDX-License-Identifier: GPL-3.0-or-later

use std::fs;
use std::path::PathBuf;
use tracing::warn;

use crate::patch::{apply_patch, PatchError};

/// Represents the boot data for FFXIV, which is located under the "boot" directory.
pub struct BootData {
    path: String,

    /// The current version of the boot data, e.g. "2012.01.01.0000.0000".
    pub version: String,
}

fn is_valid(path: &str) -> bool {
    let d = PathBuf::from(path);

    if fs::metadata(d.as_path()).is_err() {
        return false;
    }

    true
}

impl BootData {
    /// Reads from an existing boot data location.
    ///
    /// This will return _None_ if the boot directory is not valid, but it does not check the validity
    /// of each individual file.
    ///
    /// # Example
    ///
    /// ```
    /// # use physis::bootdata::BootData;
    /// let boot = BootData::from_existing("SquareEnix/Final Fantasy XIV - A Realm Reborn/boot");
    /// # assert!(boot.is_none())
    /// ```
    pub fn from_existing(directory: &str) -> Option<BootData> {
        match is_valid(directory) {
            true => Some(BootData {
                path: directory.parse().unwrap(),
                version: fs::read_to_string(format!("{directory}/ffxivboot.ver")).unwrap(),
            }),
            false => {
                warn!("Boot data is not valid!");
                None
            }
        }
    }

    /// Applies the patch to boot data and returns any errors it encounters. This function will not update the version in the BootData struct.
    pub fn apply_patch(&self, patch_path: &str) -> Result<(), PatchError> {
        apply_patch(&self.path, patch_path)
    }
}