//! IP plugin: private and (optionally) public IP information.

use crate::fields;
use glances_core::plugin::{Field, Plugin, PluginModel, UpdateContext};
use glances_core::{Args, Config};
use serde_json::{Value, json};
use std::time::Instant;

pub struct IpPlugin {
    pub model: PluginModel,
    public_api: Option<String>,
    public_field: String,
    public_template: String,
    public_disabled: bool,
    public_username: Option<String>,
    public_password: Option<String>,
    public_interval: f64,
    public_timer: Instant,
    public_address: String,
    public_info: Option<Value>,
}

impl IpPlugin {
    pub fn new(config: &Config, args: &Args) -> Self {
        let fields = fields! {
            "address" => Field::new("Private IP address"),
            "mask" => Field::new("Private IP mask"),
            "mask_cidr" => Field::new("Private IP mask in CIDR format").unit("number"),
            "gateway" => Field::new("Private IP gateway"),
            "public_address" => Field::new("Public IP address"),
            "public_info_human" => Field::new("Public IP information"),
        };
        let model = PluginModel::new(
            "ip",
            fields,
            Vec::new(),
            json!({}),
            config,
            args.time.unwrap_or(2.0),
            args.disable_history,
            args.disable_config_exec,
        );
        let public_api = model.get_conf_value("public_api", "").first().cloned();
        let public_disabled = model
            .get_conf_value("public_disabled", "")
            .first()
            .map(|v| v.to_lowercase() != "false")
            .unwrap_or(true)
            || public_api.is_none();
        Self {
            model,
            public_api,
            public_field: "ip".to_string(),
            public_template: String::new(),
            public_disabled,
            public_username: None,
            public_password: None,
            public_interval: 300.0,
            public_timer: Instant::now() - std::time::Duration::from_secs(3600),
            public_address: String::new(),
            public_info: None,
        }
    }

    fn refresh_public(&mut self) {
        if self.public_disabled {
            return;
        }
        if self.public_timer.elapsed().as_secs_f64() < self.public_interval {
            return;
        }
        self.public_timer = Instant::now();
        let Some(api) = &self.public_api else {
            return;
        };
        let mut request = ureq::get(api)
            .config()
            .timeout_global(Some(std::time::Duration::from_secs(2)))
            .build();
        if let (Some(username), Some(password)) = (&self.public_username, &self.public_password) {
            request = request.header("Authorization", &format!("Basic {}:{}", username, password));
        }
        if let Ok(mut response) = request.call() {
            if let Ok(value) = response.body_mut().read_json::<Value>() {
                self.public_address =
                    value.get(&self.public_field).and_then(Value::as_str).unwrap_or("").to_string();
                self.public_info = Some(value);
            }
        }
    }

    fn public_info_human(&self) -> String {
        let Some(info) = &self.public_info else {
            return String::new();
        };
        if self.public_template.is_empty() {
            return String::new();
        }
        let mut result = self.public_template.clone();
        for (key, value) in info.as_object().into_iter().flatten() {
            let text = match value {
                Value::String(s) => s.clone(),
                other => glances_core::py_str(other),
            };
            result = result.replace(&format!("{{{key}}}"), &text);
        }
        result
    }
}

impl Plugin for IpPlugin {
    fn name(&self) -> &str {
        "ip"
    }

    fn model(&self) -> &PluginModel {
        &self.model
    }

    fn model_mut(&mut self) -> &mut PluginModel {
        &mut self.model
    }

    fn collect(&mut self, ctx: &mut UpdateContext) -> anyhow::Result<Value> {
        let mut stats = serde_json::Map::new();
        let (address, mask) = crate::collectors::get_ip_address();
        if let Some(address) = &address {
            stats.insert("address".to_string(), json!(address));
        }
        if let Some(mask) = &mask {
            stats.insert("mask".to_string(), json!(mask));
        }
        stats.insert("mask_cidr".to_string(), json!(crate::collectors::ip_to_cidr(mask.as_deref())));
        self.refresh_public();
        if !self.public_address.is_empty() {
            let public = if ctx.args.hide_public_info {
                mask_public_ip(&self.public_address)
            } else {
                self.public_address.clone()
            };
            stats.insert("public_address".to_string(), json!(public));
            let human = self.public_info_human();
            if !human.is_empty() {
                stats.insert("public_info_human".to_string(), json!(human));
            }
        }
        Ok(Value::Object(stats))
    }

    fn display_curse(&self) -> bool {
        true
    }

    fn render(&mut self, _ctx: &glances_core::RenderContext) -> Vec<glances_core::StatLine> {
        let mut ret = Vec::new();
        let s = &self.model.stats;
        let Some(address) = s.get("address").and_then(Value::as_str) else {
            return ret;
        };
        let mut text = address.to_string();
        if let Some(mask_cidr) = s.get("mask_cidr").and_then(Value::as_u64) {
            if mask_cidr > 0 {
                text += &format!("/{mask_cidr}");
            }
        }
        ret.push(self.model.curse_add_line(text, glances_core::Decoration::Default, false, false, false));
        if let Some(gateway) = s.get("gateway").and_then(Value::as_str) {
            ret.push(self.model.curse_add_line(format!(" gw {gateway}"), glances_core::Decoration::Default, true, false, false));
        }
        ret
    }
}

fn mask_public_ip(address: &str) -> String {
    let parts: Vec<&str> = address.split('.').collect();
    if parts.len() == 4 {
        format!("{}.{}.{}.xxx", parts[0], parts[1], parts[2])
    } else {
        "xxx".to_string()
    }
}