use anyhow::Result;
use clap::{Parser, ValueEnum};
use comfy_table::presets::UTF8_FULL_CONDENSED;
use comfy_table::{Cell, Table};
use krata::v1::control::{
    control_service_client::ControlServiceClient, GetHostCpuTopologyRequest, HostCpuTopologyClass,
};
use serde_json::Value;

use crate::format::{kv2line, proto2dynamic, proto2kv};
use tonic::{transport::Channel, Request};

fn class_to_str(input: HostCpuTopologyClass) -> String {
    match input {
        HostCpuTopologyClass::Standard => "Standard".to_string(),
        HostCpuTopologyClass::Performance => "Performance".to_string(),
        HostCpuTopologyClass::Efficiency => "Efficiency".to_string(),
    }
}

#[derive(ValueEnum, Clone, Debug, PartialEq, Eq)]
enum HostCpuTopologyFormat {
    Table,
    Json,
    JsonPretty,
    Jsonl,
    Yaml,
    KeyValue,
}

#[derive(Parser)]
#[command(about = "Display information about the host CPU topology")]
pub struct HostCpuTopologyCommand {
    #[arg(short, long, default_value = "table", help = "Output format")]
    format: HostCpuTopologyFormat,
}

impl HostCpuTopologyCommand {
    pub async fn run(self, mut client: ControlServiceClient<Channel>) -> Result<()> {
        let response = client
            .get_host_cpu_topology(Request::new(GetHostCpuTopologyRequest {}))
            .await?
            .into_inner();

        match self.format {
            HostCpuTopologyFormat::Table => {
                let mut table = Table::new();
                table.load_preset(UTF8_FULL_CONDENSED);
                table.set_content_arrangement(comfy_table::ContentArrangement::Dynamic);
                table.set_header(vec!["id", "node", "socket", "core", "thread", "class"]);

                for (i, cpu) in response.cpus.iter().enumerate() {
                    table.add_row(vec![
                        Cell::new(i),
                        Cell::new(cpu.node),
                        Cell::new(cpu.socket),
                        Cell::new(cpu.core),
                        Cell::new(cpu.thread),
                        Cell::new(class_to_str(cpu.class())),
                    ]);
                }

                if !table.is_empty() {
                    println!("{}", table);
                }
            }

            HostCpuTopologyFormat::Json
            | HostCpuTopologyFormat::JsonPretty
            | HostCpuTopologyFormat::Yaml => {
                let mut values = Vec::new();
                for cpu in response.cpus {
                    let message = proto2dynamic(cpu)?;
                    values.push(serde_json::to_value(message)?);
                }
                let value = Value::Array(values);
                let encoded = if self.format == HostCpuTopologyFormat::JsonPretty {
                    serde_json::to_string_pretty(&value)?
                } else if self.format == HostCpuTopologyFormat::Yaml {
                    serde_yaml::to_string(&value)?
                } else {
                    serde_json::to_string(&value)?
                };
                println!("{}", encoded.trim());
            }

            HostCpuTopologyFormat::Jsonl => {
                for cpu in response.cpus {
                    let message = proto2dynamic(cpu)?;
                    println!("{}", serde_json::to_string(&message)?);
                }
            }

            HostCpuTopologyFormat::KeyValue => {
                for cpu in response.cpus {
                    let kvs = proto2kv(cpu)?;
                    println!("{}", kv2line(kvs),);
                }
            }
        }

        Ok(())
    }
}