mod chain;
pub mod field;
mod merge;
mod script;
pub mod seq;
mod tun;

use self::{
    chain::{AsyncChainItemFrom as _, ChainItem, ChainType},
    field::{use_keys, use_lowercase, use_sort},
    merge::use_merge,
    script::use_script,
    seq::{SeqMap, use_seq},
    tun::use_tun,
};
use crate::constants;
use crate::utils::dirs;
use crate::{config::Config, utils::tmpl};
use crate::{logging, utils::logging::Type};
use serde_yaml_ng::Mapping;
use smartstring::alias::String;
use std::collections::{HashMap, HashSet};
use tokio::fs;

type ResultLog = Vec<(String, String)>;
#[derive(Debug)]
struct ConfigValues {
    clash_config: Mapping,
    clash_core: Option<String>,
    enable_tun: bool,
    enable_builtin: bool,
    socks_enabled: bool,
    http_enabled: bool,
    enable_dns_settings: bool,
    #[cfg(not(target_os = "windows"))]
    redir_enabled: bool,
    #[cfg(target_os = "linux")]
    tproxy_enabled: bool,
}

#[derive(Debug)]
struct ProfileItems {
    config: Mapping,
    merge_item: ChainItem,
    script_item: ChainItem,
    rules_item: ChainItem,
    proxies_item: ChainItem,
    groups_item: ChainItem,
    global_merge: ChainItem,
    global_script: ChainItem,
    profile_name: String,
}

impl Default for ProfileItems {
    fn default() -> Self {
        Self {
            config: Default::default(),
            profile_name: Default::default(),
            merge_item: ChainItem {
                uid: "".into(),
                data: ChainType::Merge(Mapping::new()),
            },
            script_item: ChainItem {
                uid: "".into(),
                data: ChainType::Script(tmpl::ITEM_SCRIPT.into()),
            },
            rules_item: ChainItem {
                uid: "".into(),
                data: ChainType::Rules(SeqMap::default()),
            },
            proxies_item: ChainItem {
                uid: "".into(),
                data: ChainType::Proxies(SeqMap::default()),
            },
            groups_item: ChainItem {
                uid: "".into(),
                data: ChainType::Groups(SeqMap::default()),
            },
            global_merge: ChainItem {
                uid: "Merge".into(),
                data: ChainType::Merge(Mapping::new()),
            },
            global_script: ChainItem {
                uid: "Script".into(),
                data: ChainType::Script(tmpl::ITEM_SCRIPT.into()),
            },
        }
    }
}

async fn get_config_values() -> ConfigValues {
    let clash_config = { Config::clash().await.latest_arc().0.clone() };

    let (clash_core, enable_tun, enable_builtin, socks_enabled, http_enabled, enable_dns_settings) = {
        let verge = Config::verge().await;
        let verge = verge.latest_arc();
        (
            Some(verge.get_valid_clash_core()),
            verge.enable_tun_mode.unwrap_or(false),
            verge.enable_builtin_enhanced.unwrap_or(true),
            verge.verge_socks_enabled.unwrap_or(false),
            verge.verge_http_enabled.unwrap_or(false),
            verge.enable_dns_settings.unwrap_or(false),
        )
    };

    #[cfg(not(target_os = "windows"))]
    let redir_enabled = {
        let verge = Config::verge().await;
        let verge = verge.latest_arc();
        verge.verge_redir_enabled.unwrap_or(false)
    };

    #[cfg(target_os = "linux")]
    let tproxy_enabled = {
        let verge = Config::verge().await;
        let verge = verge.latest_arc();
        verge.verge_tproxy_enabled.unwrap_or(false)
    };

    ConfigValues {
        clash_config,
        clash_core,
        enable_tun,
        enable_builtin,
        socks_enabled,
        http_enabled,
        enable_dns_settings,
        #[cfg(not(target_os = "windows"))]
        redir_enabled,
        #[cfg(target_os = "linux")]
        tproxy_enabled,
    }
}

#[allow(clippy::cognitive_complexity)]
async fn collect_profile_items() -> ProfileItems {
    // 从profiles里拿东西 - 先收集需要的数据，然后释放锁
    let (current, merge_uid, script_uid, rules_uid, proxies_uid, groups_uid, name) = {
        let current = {
            let profiles = Config::profiles().await;
            let profiles_clone = profiles.latest_arc();
            profiles_clone.current_mapping().await.unwrap_or_default()
        };

        let profiles = Config::profiles().await;
        let profiles_ref = profiles.latest_arc();
        let current_profile_uid = match profiles_ref.get_current() {
            Some(uid) => uid.clone(),
            None => return ProfileItems::default(),
        };

        let current_item = match profiles_ref.get_item_arc(&current_profile_uid) {
            Some(item) => item,
            None => return ProfileItems::default(),
        };

        let merge_uid = current_item
            .current_merge()
            .unwrap_or_else(|| "Merge".into());
        let script_uid = current_item
            .current_script()
            .unwrap_or_else(|| "Script".into());
        let rules_uid = current_item
            .current_rules()
            .unwrap_or_else(|| "Rules".into());
        let proxies_uid = current_item
            .current_proxies()
            .unwrap_or_else(|| "Proxies".into());
        let groups_uid = current_item
            .current_groups()
            .unwrap_or_else(|| "Groups".into());

        let name = profiles_ref
            .get_item(&current_profile_uid)
            .ok()
            .and_then(|item| item.name.clone())
            .unwrap_or_default();

        (
            current,
            merge_uid,
            script_uid,
            rules_uid,
            proxies_uid,
            groups_uid,
            name,
        )
    };

    // 现在获取具体的items，此时profiles锁已经释放
    let merge_item = {
        let item = {
            let profiles = Config::profiles().await;
            let profiles = profiles.latest_arc();
            profiles.get_item(&merge_uid).ok().cloned()
        };
        if let Some(item) = item {
            <Option<ChainItem>>::from_async(&item).await
        } else {
            None
        }
    }
    .unwrap_or_else(|| ChainItem {
        uid: "".into(),
        data: ChainType::Merge(Mapping::new()),
    });

    let script_item = {
        let item = {
            let profiles = Config::profiles().await;
            let profiles = profiles.latest_arc();
            profiles.get_item(&script_uid).ok().cloned()
        };
        if let Some(item) = item {
            <Option<ChainItem>>::from_async(&item).await
        } else {
            None
        }
    }
    .unwrap_or_else(|| ChainItem {
        uid: "".into(),
        data: ChainType::Script(tmpl::ITEM_SCRIPT.into()),
    });

    let rules_item = {
        let item = {
            let profiles = Config::profiles().await;
            let profiles = profiles.latest_arc();
            profiles.get_item(&rules_uid).ok().cloned()
        };
        if let Some(item) = item {
            <Option<ChainItem>>::from_async(&item).await
        } else {
            None
        }
    }
    .unwrap_or_else(|| ChainItem {
        uid: "".into(),
        data: ChainType::Rules(SeqMap::default()),
    });

    let proxies_item = {
        let item = {
            let profiles = Config::profiles().await;
            let profiles = profiles.latest_arc();
            profiles.get_item(&proxies_uid).ok().cloned()
        };
        if let Some(item) = item {
            <Option<ChainItem>>::from_async(&item).await
        } else {
            None
        }
    }
    .unwrap_or_else(|| ChainItem {
        uid: "".into(),
        data: ChainType::Proxies(SeqMap::default()),
    });

    let groups_item = {
        let item = {
            let profiles = Config::profiles().await;
            let profiles = profiles.latest_arc();
            profiles.get_item(&groups_uid).ok().cloned()
        };
        if let Some(item) = item {
            <Option<ChainItem>>::from_async(&item).await
        } else {
            None
        }
    }
    .unwrap_or_else(|| ChainItem {
        uid: "".into(),
        data: ChainType::Groups(SeqMap::default()),
    });

    let global_merge = {
        let item = {
            let profiles = Config::profiles().await;
            let profiles = profiles.latest_arc();
            profiles.get_item("Merge").ok().cloned()
        };
        if let Some(item) = item {
            <Option<ChainItem>>::from_async(&item).await
        } else {
            None
        }
    }
    .unwrap_or_else(|| ChainItem {
        uid: "Merge".into(),
        data: ChainType::Merge(Mapping::new()),
    });

    let global_script = {
        let item = {
            let profiles = Config::profiles().await;
            let profiles = profiles.latest_arc();
            profiles.get_item("Script").ok().cloned()
        };
        if let Some(item) = item {
            <Option<ChainItem>>::from_async(&item).await
        } else {
            None
        }
    }
    .unwrap_or_else(|| ChainItem {
        uid: "Script".into(),
        data: ChainType::Script(tmpl::ITEM_SCRIPT.into()),
    });

    ProfileItems {
        config: current,
        merge_item,
        script_item,
        rules_item,
        proxies_item,
        groups_item,
        global_merge,
        global_script,
        profile_name: name,
    }
}

fn process_global_items(
    mut config: Mapping,
    global_merge: ChainItem,
    global_script: ChainItem,
    profile_name: String,
) -> (Mapping, Vec<String>, HashMap<String, ResultLog>) {
    let mut result_map = HashMap::new();
    let mut exists_keys = use_keys(&config);

    if let ChainType::Merge(merge) = global_merge.data {
        exists_keys.extend(use_keys(&merge));
        config = use_merge(merge, config.to_owned());
    }

    if let ChainType::Script(script) = global_script.data {
        let mut logs = vec![];
        match use_script(script, config.to_owned(), profile_name) {
            Ok((res_config, res_logs)) => {
                exists_keys.extend(use_keys(&res_config));
                config = res_config;
                logs.extend(res_logs);
            }
            Err(err) => logs.push(("exception".into(), err.to_string().into())),
        }
        result_map.insert(global_script.uid, logs);
    }

    (config, exists_keys, result_map)
}

#[allow(clippy::too_many_arguments)]
fn process_profile_items(
    mut config: Mapping,
    mut exists_keys: Vec<String>,
    mut result_map: HashMap<String, ResultLog>,
    rules_item: ChainItem,
    proxies_item: ChainItem,
    groups_item: ChainItem,
    merge_item: ChainItem,
    script_item: ChainItem,
    profile_name: String,
) -> (Mapping, Vec<String>, HashMap<String, ResultLog>) {
    if let ChainType::Rules(rules) = rules_item.data {
        config = use_seq(rules, config.to_owned(), "rules");
    }

    if let ChainType::Proxies(proxies) = proxies_item.data {
        config = use_seq(proxies, config.to_owned(), "proxies");
    }

    if let ChainType::Groups(groups) = groups_item.data {
        config = use_seq(groups, config.to_owned(), "proxy-groups");
    }

    if let ChainType::Merge(merge) = merge_item.data {
        exists_keys.extend(use_keys(&merge));
        config = use_merge(merge, config.to_owned());
    }

    if let ChainType::Script(script) = script_item.data {
        let mut logs = vec![];
        match use_script(script, config.to_owned(), profile_name) {
            Ok((res_config, res_logs)) => {
                exists_keys.extend(use_keys(&res_config));
                config = res_config;
                logs.extend(res_logs);
            }
            Err(err) => logs.push(("exception".into(), err.to_string().into())),
        }
        result_map.insert(script_item.uid, logs);
    }

    (config, exists_keys, result_map)
}

async fn merge_default_config(
    mut config: Mapping,
    clash_config: Mapping,
    socks_enabled: bool,
    http_enabled: bool,
    #[cfg(not(target_os = "windows"))] redir_enabled: bool,
    #[cfg(target_os = "linux")] tproxy_enabled: bool,
) -> Mapping {
    for (key, value) in clash_config.into_iter() {
        if key.as_str() == Some("tun") {
            let mut tun = config.get_mut("tun").map_or_else(Mapping::new, |val| {
                val.as_mapping().cloned().unwrap_or_else(Mapping::new)
            });
            let patch_tun = value.as_mapping().cloned().unwrap_or_else(Mapping::new);
            for (key, value) in patch_tun.into_iter() {
                tun.insert(key, value);
            }
            config.insert("tun".into(), tun.into());
        } else {
            if key.as_str() == Some("socks-port") && !socks_enabled {
                config.remove("socks-port");
                continue;
            }
            if key.as_str() == Some("port") && !http_enabled {
                config.remove("port");
                continue;
            }
            #[cfg(target_os = "windows")]
            {
                if key.as_str() == Some("redir-port") {
                    continue;
                }
            }
            #[cfg(not(target_os = "windows"))]
            {
                if key.as_str() == Some("redir-port") && !redir_enabled {
                    config.remove("redir-port");
                    continue;
                }
            }
            #[cfg(target_os = "linux")]
            {
                if key.as_str() == Some("tproxy-port") && !tproxy_enabled {
                    config.remove("tproxy-port");
                    continue;
                }
            }
            #[cfg(not(target_os = "linux"))]
            {
                if key.as_str() == Some("tproxy-port") {
                    config.remove("tproxy-port");
                    continue;
                }
            }
            // 处理 external-controller 键的开关逻辑
            if key.as_str() == Some("external-controller") {
                let enable_external_controller = Config::verge()
                    .await
                    .latest_arc()
                    .enable_external_controller
                    .unwrap_or(false);

                if enable_external_controller {
                    config.insert(key, value);
                } else {
                    // 如果禁用了外部控制器，设置为空字符串
                    config.insert(key, "".into());
                }
            } else {
                config.insert(key, value);
            }
        }
    }

    config
}

fn apply_builtin_scripts(
    mut config: Mapping,
    clash_core: Option<String>,
    enable_builtin: bool,
) -> Mapping {
    if enable_builtin {
        ChainItem::builtin()
            .into_iter()
            .filter(|(s, _)| s.is_support(clash_core.as_ref()))
            .map(|(_, c)| c)
            .for_each(|item| {
                logging!(debug, Type::Core, "run builtin script {}", item.uid);
                if let ChainType::Script(script) = item.data {
                    match use_script(script, config.to_owned(), "".into()) {
                        Ok((res_config, _)) => {
                            config = res_config;
                        }
                        Err(err) => {
                            logging!(error, Type::Core, "builtin script error `{err}`");
                        }
                    }
                }
            });
    }

    config
}

async fn apply_dns_settings(mut config: Mapping, enable_dns_settings: bool) -> Mapping {
    if enable_dns_settings && let Ok(app_dir) = dirs::app_home_dir() {
        let dns_path = app_dir.join(constants::files::DNS_CONFIG);

        if dns_path.exists()
            && let Ok(dns_yaml) = fs::read_to_string(&dns_path).await
            && let Ok(dns_config) = serde_yaml_ng::from_str::<serde_yaml_ng::Mapping>(&dns_yaml)
        {
            if let Some(hosts_value) = dns_config.get("hosts")
                && hosts_value.is_mapping()
            {
                config.insert("hosts".into(), hosts_value.clone());
                logging!(info, Type::Core, "apply hosts configuration");
            }

            if let Some(dns_value) = dns_config.get("dns") {
                if let Some(dns_mapping) = dns_value.as_mapping() {
                    config.insert("dns".into(), dns_mapping.clone().into());
                    logging!(info, Type::Core, "apply dns_config.yaml (dns section)");
                }
            } else {
                config.insert("dns".into(), dns_config.into());
                logging!(info, Type::Core, "apply dns_config.yaml");
            }
        }
    }

    config
}

/// Enhance mode
/// 返回最终订阅、该订阅包含的键、和script执行的结果
pub async fn enhance() -> (Mapping, Vec<String>, HashMap<String, ResultLog>) {
    // gather config values
    let cfg_vals = get_config_values().await;
    let ConfigValues {
        clash_config,
        clash_core,
        enable_tun,
        enable_builtin,
        socks_enabled,
        http_enabled,
        enable_dns_settings,
        #[cfg(not(target_os = "windows"))]
        redir_enabled,
        #[cfg(target_os = "linux")]
        tproxy_enabled,
    } = cfg_vals;

    // collect profile items
    let profile = collect_profile_items().await;
    let config = profile.config;
    let merge_item = profile.merge_item;
    let script_item = profile.script_item;
    let rules_item = profile.rules_item;
    let proxies_item = profile.proxies_item;
    let groups_item = profile.groups_item;
    let global_merge = profile.global_merge;
    let global_script = profile.global_script;
    let profile_name = profile.profile_name;

    // process globals
    let (config, exists_keys, result_map) =
        process_global_items(config, global_merge, global_script, profile_name.clone());

    // process profile-specific items
    let (config, exists_keys, result_map) = process_profile_items(
        config,
        exists_keys,
        result_map,
        rules_item,
        proxies_item,
        groups_item,
        merge_item,
        script_item,
        profile_name,
    );

    // merge default clash config
    let config = merge_default_config(
        config,
        clash_config,
        socks_enabled,
        http_enabled,
        #[cfg(not(target_os = "windows"))]
        redir_enabled,
        #[cfg(target_os = "linux")]
        tproxy_enabled,
    )
    .await;

    // builtin scripts
    let mut config = apply_builtin_scripts(config, clash_core, enable_builtin);

    config = use_tun(config, enable_tun);
    config = use_sort(config);

    // dns settings
    config = apply_dns_settings(config, enable_dns_settings).await;

    let mut exists_set = HashSet::new();
    exists_set.extend(exists_keys);
    let exists_keys: Vec<String> = exists_set.into_iter().collect();

    (config, exists_keys, result_map)
}