use super::{prfitem::PrfItem, ChainItem};
use crate::utils::{dirs, help};
use anyhow::{bail, Context, Result};
use serde::{Deserialize, Serialize};
use serde_yaml::Mapping;
use std::{fs, io::Write};

/// Define the `profiles.yaml` schema
#[derive(Default, Debug, Clone, Deserialize, Serialize)]
pub struct IProfiles {
    /// same as PrfConfig.current
    pub current: Option<String>,

    /// same as PrfConfig.chain
    pub chain: Option<Vec<String>>,

    /// record valid fields for clash
    pub valid: Option<Vec<String>>,

    /// profile list
    pub items: Option<Vec<PrfItem>>,
}

macro_rules! patch {
    ($lv: expr, $rv: expr, $key: tt) => {
        if ($rv.$key).is_some() {
            $lv.$key = $rv.$key;
        }
    };
}

impl IProfiles {
    pub fn new() -> Self {
        match dirs::profiles_path().and_then(|path| help::read_yaml::<Self>(&path)) {
            Ok(mut profiles) => {
                if profiles.items.is_none() {
                    profiles.items = Some(vec![]);
                }
                // compatible with the old old old version
                profiles.items.as_mut().map(|items| {
                    for mut item in items.iter_mut() {
                        if item.uid.is_none() {
                            item.uid = Some(help::get_uid("d"));
                        }
                    }
                });
                profiles
            }
            Err(err) => {
                log::error!(target: "app", "{err}");
                Self::template()
            }
        }
    }

    pub fn template() -> Self {
        Self {
            valid: Some(vec!["dns".into()]),
            items: Some(vec![]),
            ..Self::default()
        }
    }

    pub fn save_file(&self) -> Result<()> {
        help::save_yaml(
            &dirs::profiles_path()?,
            self,
            Some("# Profiles Config for Clash Verge"),
        )
    }

    /// 只修改current，valid和chain
    pub fn patch_config(&mut self, patch: IProfiles) -> Result<()> {
        if self.items.is_none() {
            self.items = Some(vec![]);
        }

        if let Some(current) = patch.current {
            let items = self.items.as_ref().unwrap();
            let some_uid = Some(current);

            if items.iter().any(|e| e.uid == some_uid) {
                self.current = some_uid;
            }
        }

        if let Some(chain) = patch.chain {
            self.chain = Some(chain);
        }

        if let Some(valid) = patch.valid {
            self.valid = Some(valid);
        }

        Ok(())
    }

    pub fn get_current(&self) -> Option<String> {
        self.current.clone()
    }

    /// get items ref
    pub fn get_items(&self) -> Option<&Vec<PrfItem>> {
        self.items.as_ref()
    }

    /// find the item by the uid
    pub fn get_item(&self, uid: &String) -> Result<&PrfItem> {
        if let Some(items) = self.items.as_ref() {
            let some_uid = Some(uid.clone());

            for each in items.iter() {
                if each.uid == some_uid {
                    return Ok(each);
                }
            }
        }

        bail!("failed to get the profile item \"uid:{uid}\"");
    }

    /// append new item
    /// if the file_data is some
    /// then should save the data to file
    pub fn append_item(&mut self, mut item: PrfItem) -> Result<()> {
        if item.uid.is_none() {
            bail!("the uid should not be null");
        }

        // save the file data
        // move the field value after save
        if let Some(file_data) = item.file_data.take() {
            if item.file.is_none() {
                bail!("the file should not be null");
            }

            let file = item.file.clone().unwrap();
            let path = dirs::app_profiles_dir()?.join(&file);

            fs::File::create(path)
                .context(format!("failed to create file \"{}\"", file))?
                .write(file_data.as_bytes())
                .context(format!("failed to write to file \"{}\"", file))?;
        }

        if self.items.is_none() {
            self.items = Some(vec![]);
        }

        self.items.as_mut().map(|items| items.push(item));
        self.save_file()
    }

    /// update the item value
    pub fn patch_item(&mut self, uid: String, item: PrfItem) -> Result<()> {
        let mut items = self.items.take().unwrap_or(vec![]);

        for mut each in items.iter_mut() {
            if each.uid == Some(uid.clone()) {
                patch!(each, item, itype);
                patch!(each, item, name);
                patch!(each, item, desc);
                patch!(each, item, file);
                patch!(each, item, url);
                patch!(each, item, selected);
                patch!(each, item, extra);
                patch!(each, item, updated);
                patch!(each, item, option);

                self.items = Some(items);
                return self.save_file();
            }
        }

        self.items = Some(items);
        bail!("failed to find the profile item \"uid:{uid}\"")
    }

    /// be used to update the remote item
    /// only patch `updated` `extra` `file_data`
    pub fn update_item(&mut self, uid: String, mut item: PrfItem) -> Result<()> {
        if self.items.is_none() {
            self.items = Some(vec![]);
        }

        // find the item
        let _ = self.get_item(&uid)?;

        if let Some(items) = self.items.as_mut() {
            let some_uid = Some(uid.clone());

            for mut each in items.iter_mut() {
                if each.uid == some_uid {
                    each.extra = item.extra;
                    each.updated = item.updated;

                    // save the file data
                    // move the field value after save
                    if let Some(file_data) = item.file_data.take() {
                        let file = each.file.take();
                        let file =
                            file.unwrap_or(item.file.take().unwrap_or(format!("{}.yaml", &uid)));

                        // the file must exists
                        each.file = Some(file.clone());

                        let path = dirs::app_profiles_dir()?.join(&file);

                        fs::File::create(path)
                            .context(format!("failed to create file \"{}\"", file))?
                            .write(file_data.as_bytes())
                            .context(format!("failed to write to file \"{}\"", file))?;
                    }

                    break;
                }
            }
        }

        self.save_file()
    }

    /// delete item
    /// if delete the current then return true
    pub fn delete_item(&mut self, uid: String) -> Result<bool> {
        let current = self.current.as_ref().unwrap_or(&uid);
        let current = current.clone();

        let mut items = self.items.take().unwrap_or(vec![]);
        let mut index = None;

        // get the index
        for i in 0..items.len() {
            if items[i].uid == Some(uid.clone()) {
                index = Some(i);
                break;
            }
        }

        if let Some(index) = index {
            items.remove(index).file.map(|file| {
                let _ = dirs::app_profiles_dir().map(|path| {
                    let path = path.join(file);
                    if path.exists() {
                        let _ = fs::remove_file(path);
                    }
                });
            });
        }

        // delete the original uid
        if current == uid {
            self.current = match items.len() > 0 {
                true => items[0].uid.clone(),
                false => None,
            };
        }

        self.items = Some(items);
        self.save_file()?;
        Ok(current == uid)
    }

    /// generate the current Mapping data
    fn gen_current(&self) -> Result<Mapping> {
        let config = Mapping::new();

        if self.current.is_none() || self.items.is_none() {
            return Ok(config);
        }

        let current = self.current.as_ref().unwrap();
        for item in self.items.as_ref().unwrap().iter() {
            if item.uid.as_ref() == Some(current) {
                let file_path = match item.file.as_ref() {
                    Some(file) => dirs::app_profiles_dir()?.join(file),
                    None => bail!("failed to get the file field"),
                };

                return Ok(help::read_merge_mapping(&file_path)?);
            }
        }
        bail!("failed to find the current profile \"uid:{current}\"");
    }

    /// generate the data for activate clash config
    pub fn gen_activate(&self) -> Result<PrfActivate> {
        let current = self.gen_current()?;
        let chain = match self.chain.as_ref() {
            Some(chain) => chain
                .iter()
                .filter_map(|uid| self.get_item(uid).ok())
                .filter_map(|item| item.to_enhance())
                .collect::<Vec<ChainItem>>(),
            None => vec![],
        };
        let valid = self.valid.clone().unwrap_or(vec![]);

        Ok(PrfActivate {
            current,
            chain,
            valid,
        })
    }
}

#[derive(Default, Clone)]
pub struct PrfActivate {
    pub current: Mapping,
    pub chain: Vec<ChainItem>,
    pub valid: Vec<String>,
}