pub mod call;
pub mod class;

use std::time::SystemTime;
use std::{collections::HashMap, path::PathBuf};

use pyo3::prelude::*;
use pyo3::types::PyTuple;
use tracing::{debug, info, warn};

use crate::client::IcalinguaStatus;
use crate::config::IcaConfig;

#[derive(Debug, Clone)]
pub struct PyStatus {
    pub files: Option<HashMap<PathBuf, PyPlugin>>,
}

pub type PyPluginData = HashMap<PathBuf, PyPlugin>;
pub type RawPyPlugin = (PathBuf, Option<SystemTime>, String);

#[derive(Debug, Clone)]
pub struct PyPlugin {
    pub file_path: PathBuf,
    pub changed_time: Option<SystemTime>,
    pub py_module: Py<PyAny>,
}

impl PyPlugin {
    pub fn new_from_path(path: &PathBuf) -> Option<Self> {
        let raw_file = load_py_file(&path);
        match raw_file {
            Ok(raw_file) => match Self::try_from(raw_file) {
                Ok(plugin) => Some(plugin),
                Err(e) => {
                    warn!("加载 Python 插件文件{:?}: {:?} 失败", path, e);
                    None
                }
            },
            Err(e) => {
                warn!("加载插件 {:?}: {:?} 失败", path, e);
                None
            }
        }
    }
    pub fn verifiy(&self) -> bool {
        match get_change_time(&self.file_path) {
            None => false,
            Some(time) => {
                if let Some(changed_time) = self.changed_time {
                    time.eq(&changed_time)
                } else {
                    true
                }
            }
        }
    }
}

impl TryFrom<RawPyPlugin> for PyPlugin {
    type Error = PyErr;
    fn try_from(value: RawPyPlugin) -> Result<Self, Self::Error> {
        let (path, changed_time, content) = value;
        let py_module = py_module_from_code(&content, &path);
        if let Err(e) = py_module {
            warn!("加载 Python 插件: {:?} 失败", e);
            return Err(e);
        };
        let py_module = py_module.unwrap();
        Python::with_gil(|py| {
            let module = py_module.as_ref(py);
            if let Some(config_func) = call::get_func(module, &path, "on_config") {
                match config_func.call0() {
                    Ok(config) => {
                        if config.is_instance_of::<PyTuple>() {
                            let (config, default) = config.extract::<(String, String)>().unwrap();
                            let base_path =
                                IcalinguaStatus::get_config().py_config_path.as_ref().unwrap();

                            let mut base_path: PathBuf = PathBuf::from(base_path);

                            if !base_path.exists() {
                                warn!("python 插件路径不存在, 创建: {:?}", base_path);
                                std::fs::create_dir_all(&base_path)?;
                            }
                            base_path.push(&config);

                            let config_value = if base_path.exists() {
                                info!("加载 {:?} 的配置文件 {:?} 中", path, base_path);
                                let content = std::fs::read_to_string(&base_path)?;
                                toml::from_str(&content)
                            } else {
                                warn!("配置文件 {:?} 不存在, 创建默认配置", base_path);
                                // 写入默认配置
                                std::fs::write(base_path, &default)?;
                                toml::from_str(&default)
                            };
                            match config_value {
                                Ok(config) => {
                                    let py_config = class::ConfigDataPy::new(config);
                                    let py_config = PyCell::new(py, py_config).unwrap();
                                    module.setattr("CONFIG_DATA", py_config).unwrap();
                                    Ok(PyPlugin {
                                        file_path: path,
                                        changed_time,
                                        py_module: module.into_py(py),
                                    })
                                }
                                Err(e) => {
                                    warn!(
                                        "加载 Python 插件 {:?} 的配置文件信息时失败:{:?}",
                                        path, e
                                    );
                                    Err(PyErr::new::<pyo3::exceptions::PyTypeError, _>(format!(
                                        "加载 Python 插件 {:?} 的配置文件信息时失败:{:?}",
                                        path, e
                                    )))
                                }
                            }
                        } else {
                            warn!(
                                "加载 Python 插件 {:?} 的配置文件信息时失败:返回的不是 [str, str]",
                                path
                            );
                            Err(PyErr::new::<pyo3::exceptions::PyTypeError, _>(format!(
                                "返回的不是 [str, str]"
                            )))
                        }
                    }
                    Err(e) => {
                        warn!("加载 Python 插件 {:?} 的配置文件信息时失败:{:?}", path, e);
                        Err(e)
                    }
                }
            } else {
                Ok(PyPlugin {
                    file_path: path,
                    changed_time,
                    py_module: module.into_py(py),
                })
            }
        })
    }
}

impl PyStatus {
    pub fn get_files() -> &'static PyPluginData {
        unsafe {
            match PYSTATUS.files.as_ref() {
                Some(files) => files,
                None => {
                    PYSTATUS.files = Some(HashMap::new());
                    PYSTATUS.files.as_ref().unwrap()
                }
            }
        }
    }

    pub fn add_file(path: PathBuf, plugin: PyPlugin) {
        unsafe {
            match PYSTATUS.files.as_mut() {
                Some(files) => {
                    files.insert(path, plugin);
                }
                None => {
                    let mut files: PyPluginData = HashMap::new();
                    files.insert(path, plugin);
                    PYSTATUS.files = Some(files);
                }
            }
        }
    }

    pub fn verify_file(path: &PathBuf) -> bool {
        unsafe {
            match PYSTATUS.files.as_ref() {
                Some(files) => match files.get(path) {
                    Some(plugin) => plugin.verifiy(),
                    None => false,
                },
                None => false,
            }
        }
    }
}

pub static mut PYSTATUS: PyStatus = PyStatus { files: None };

pub fn load_py_plugins(path: &PathBuf) -> () {
    if path.exists() {
        info!("finding plugins in: {:?}", path);
        // 搜索所有的 py 文件 和 文件夹单层下面的 py 文件
        match path.read_dir() {
            Err(e) => {
                warn!("failed to read plugin path: {:?}", e);
            }
            Ok(dir) => {
                for entry in dir {
                    let entry = entry.unwrap();
                    let path = entry.path();
                    if let Some(ext) = path.extension() {
                        if ext == "py" {
                            if let Some(plugin) = PyPlugin::new_from_path(&path) {
                                PyStatus::add_file(path, plugin);
                            }
                        }
                    }
                }
            }
        }
    } else {
        warn!("plugin path not exists: {:?}", path);
    }
    info!(
        "python 插件目录: {:?} 加载完成, 加载到 {} 个插件",
        path,
        PyStatus::get_files().len()
    );
}

pub fn get_change_time(path: &PathBuf) -> Option<SystemTime> {
    path.metadata().ok()?.modified().ok()
}

pub fn py_module_from_code(content: &str, path: &PathBuf) -> PyResult<Py<PyAny>> {
    Python::with_gil(|py| -> PyResult<Py<PyAny>> {
        let module: PyResult<Py<PyAny>> = PyModule::from_code(
            py,
            &content,
            &path.to_string_lossy(),
            &path.file_name().unwrap().to_string_lossy(),
            // !!!! 请注意, 一定要给他一个名字, cpython 会自动把后面的重名模块覆盖掉前面的
        )
        .map(|module| module.into());
        module
    })
}

/// 传入文件路径
/// 返回 hash 和 文件内容
pub fn load_py_file(path: &PathBuf) -> std::io::Result<RawPyPlugin> {
    let changed_time = get_change_time(&path);
    let content = std::fs::read_to_string(path)?;
    Ok((path.clone(), changed_time, content))
}

pub fn init_py(config: &IcaConfig) {
    debug!("initing python threads");
    pyo3::prepare_freethreaded_python();
    if let Some(plugin_path) = &config.py_plugin_path {
        let path = PathBuf::from(plugin_path);
        load_py_plugins(&path);
        debug!("python 插件列表: {:#?}", PyStatus::get_files());
    }

    info!("python inited")
}