use std::{
    io::{Read, Write},
    path::PathBuf,
    sync::Mutex,
};

use mlua::{AsChunk, Lua, Table};
use serde_json::json;

use crate::{
    tools::{app_path, clone_repo},
    CrateConfig,
};

use self::{
    interface::PluginInfo,
    interface::{
        command::PluginCommander, dirs::PluginDirs, fs::PluginFileSystem, log::PluginLogger,
        network::PluginNetwork, os::PluginOS, path::PluginPath,
    },
};

mod types;
pub mod interface;

lazy_static::lazy_static! {
    static ref LUA: Mutex<Lua> = Mutex::new(Lua::new());
}

pub struct PluginManager;

impl PluginManager {
    pub fn init(config: toml::Value) -> anyhow::Result<()> {
        let lua = LUA.lock().unwrap();

        let manager = lua.create_table().unwrap();
        let plugin_dir = Self::init_plugin_dir();

        let api = lua.create_table().unwrap();

        api.set("log", PluginLogger).unwrap();
        api.set("command", PluginCommander).unwrap();
        api.set("network", PluginNetwork).unwrap();
        api.set("dirs", PluginDirs).unwrap();
        api.set("fs", PluginFileSystem).unwrap();
        api.set("path", PluginPath).unwrap();
        api.set("os", PluginOS).unwrap();

        lua.globals().set("plugin_lib", api).unwrap();
        lua.globals()
            .set("library_dir", plugin_dir.to_str().unwrap())
            .unwrap();
        // lua.globals()
        //     .set("config_info", );

        let mut index: u32 = 1;
        let mut init_list: Vec<(u32, PathBuf, PluginInfo)> = Vec::new();
        let dirs = std::fs::read_dir(&plugin_dir)?;
        for entry in dirs {
            if entry.is_err() {
                continue;
            }
            let entry = entry.unwrap();
            let plugin_dir = entry.path().to_path_buf();
            if plugin_dir.is_dir() {
                let init_file = plugin_dir.join("init.lua");
                if init_file.is_file() {
                    let mut file = std::fs::File::open(init_file).unwrap();
                    let mut buffer = String::new();
                    file.read_to_string(&mut buffer).unwrap();

                    let info = lua.load(&buffer).eval::<PluginInfo>();
                    match info {
                        Ok(info) => {
                            let _ = manager.set(index, info.clone());

                            let dir_name_str = plugin_dir.name().unwrap().to_string();
                            lua.globals().set("current_dir_name", dir_name_str).unwrap();

                            // call `on_init` if file "dcp.json" not exists
                            let dcp_file = plugin_dir.join("dcp.json");
                            if !dcp_file.is_file() {
                                init_list.push((index, dcp_file, info));
                            }

                            index += 1;
                        }
                        Err(_e) => {
                            let dir_name = plugin_dir.file_name().unwrap().to_str().unwrap();
                            log::error!("Plugin '{dir_name}' load failed.");
                        }
                    }
                }
            }
        }

        lua.globals().set("manager", manager).unwrap();

        for (idx, path, info) in init_list {
            let res = lua
                .load(mlua::chunk! {
                    manager[$idx].on_init()
                })
                .eval::<bool>();
            match res {
                Ok(true) => {
                    // plugin init success, create `dcp.json` file.
                    let mut file = std::fs::File::create(path).unwrap();
                    let value = json!({
                        "name": info.name,
                        "author": info.author,
                        "repository": info.repository,
                        "version": info.version,
                        "generate_time": chrono::Local::now().timestamp(),
                    });
                    let buffer = serde_json::to_string_pretty(&value).unwrap();
                    let buffer = buffer.as_bytes();
                    file.write_all(buffer).unwrap();
                }
                Ok(false) => {
                    log::warn!("Plugin init function result is `false`, init failed.");
                    let _ = lua
                        .load(mlua::chunk! {
                            table.remove(manager, $idx)
                        })
                        .exec();
                }
                Err(e) => {
                    // plugin init failed
                    log::warn!("Plugin init failed: {e}");
                    let _ = lua
                        .load(mlua::chunk! {
                            table.remove(manager, $idx)
                        })
                        .exec();
                }
            }
        }
        return Ok(());
    }

    pub fn on_build_start(crate_config: &CrateConfig, platform: &str) -> anyhow::Result<()> {
        let lua = LUA.lock().unwrap();

        if !lua.globals().contains_key("manager")? {
            return Ok(());
        }
        let manager = lua.globals().get::<_, Table>("manager")?;

        let args = lua.create_table()?;
        args.set("name", crate_config.dioxus_config.application.name.clone())?;
        args.set("platform", platform)?;
        args.set("out_dir", crate_config.out_dir.to_str().unwrap())?;
        args.set("asset_dir", crate_config.asset_dir.to_str().unwrap())?;

        for i in 1..(manager.len()? as i32 + 1) {
            let info = manager.get::<i32, PluginInfo>(i)?;
            if let Some(func) = info.build.on_start {
                func.call::<Table, ()>(args.clone())?;
            }
        }

        Ok(())
    }

    pub fn on_build_finish(crate_config: &CrateConfig, platform: &str) -> anyhow::Result<()> {
        let lua = LUA.lock().unwrap();

        if !lua.globals().contains_key("manager")? {
            return Ok(());
        }
        let manager = lua.globals().get::<_, Table>("manager")?;

        let args = lua.create_table()?;
        args.set("name", crate_config.dioxus_config.application.name.clone())?;
        args.set("platform", platform)?;
        args.set("out_dir", crate_config.out_dir.to_str().unwrap())?;
        args.set("asset_dir", crate_config.asset_dir.to_str().unwrap())?;

        for i in 1..(manager.len()? as i32 + 1) {
            let info = manager.get::<i32, PluginInfo>(i)?;
            if let Some(func) = info.build.on_finish {
                func.call::<Table, ()>(args.clone())?;
            }
        }

        Ok(())
    }

    pub fn on_serve_start(crate_config: &CrateConfig) -> anyhow::Result<()> {
        let lua = LUA.lock().unwrap();

        if !lua.globals().contains_key("manager")? {
            return Ok(());
        }
        let manager = lua.globals().get::<_, Table>("manager")?;

        let args = lua.create_table()?;
        args.set("name", crate_config.dioxus_config.application.name.clone())?;

        for i in 1..(manager.len()? as i32 + 1) {
            let info = manager.get::<i32, PluginInfo>(i)?;
            if let Some(func) = info.serve.on_start {
                func.call::<Table, ()>(args.clone())?;
            }
        }

        Ok(())
    }

    pub fn on_serve_rebuild(timestamp: i64, files: Vec<PathBuf>) -> anyhow::Result<()> {
        let lua = LUA.lock().unwrap();

        let manager = lua.globals().get::<_, Table>("manager")?;

        let args = lua.create_table()?;
        args.set("timestamp", timestamp)?;
        let files: Vec<String> = files
            .iter()
            .map(|v| v.to_str().unwrap().to_string())
            .collect();
        args.set("changed_files", files)?;

        for i in 1..(manager.len()? as i32 + 1) {
            let info = manager.get::<i32, PluginInfo>(i)?;
            if let Some(func) = info.serve.on_rebuild {
                func.call::<Table, ()>(args.clone())?;
            }
        }

        Ok(())
    }

    pub fn on_serve_shutdown(crate_config: &CrateConfig) -> anyhow::Result<()> {
        let lua = LUA.lock().unwrap();

        if !lua.globals().contains_key("manager")? {
            return Ok(());
        }
        let manager = lua.globals().get::<_, Table>("manager")?;

        let args = lua.create_table()?;
        args.set("name", crate_config.dioxus_config.application.name.clone())?;

        for i in 1..(manager.len()? as i32 + 1) {
            let info = manager.get::<i32, PluginInfo>(i)?;
            if let Some(func) = info.serve.on_shutdown {
                func.call::<Table, ()>(args.clone())?;
            }
        }

        Ok(())
    }

    pub fn init_plugin_dir() -> PathBuf {
        let app_path = app_path();
        let plugin_path = app_path.join("plugins");
        if !plugin_path.is_dir() {
            log::info!("📖 Start to init plugin library ...");
            let url = "https://github.com/DioxusLabs/cli-plugin-library";
            clone_repo(&plugin_path, url).unwrap();
        }
        plugin_path
    }

    pub fn plugin_list() -> Vec<String> {
        let mut res = vec![];

        let app_path = app_path();
        let plugin_path = app_path.join("plugins");

        let child_dirs = std::fs::read_dir(plugin_path).unwrap();
        for p in child_dirs {
            if let Ok(p) = p {
                if p.path().is_dir() && p.file_name() != "library" {
                    if p.path().join("init.lua").is_file() {
                        res.push(p.file_name().to_str().unwrap().to_string());
                    }
                }
            }
        }

        res
    }
}