use failure::*;
use serde_json::{json, Value};

use proxmox::api::{api, cli::*};

use proxmox_backup::tools;
use proxmox_backup::config;
use proxmox_backup::api2::types::*;
use proxmox_backup::client::*;
use proxmox_backup::tools::ticket::*;
use proxmox_backup::auth_helpers::*;


async fn view_task_result(
    client: HttpClient,
    result: Value,
    output_format: &str,
) -> Result<(), Error> {
    let data = &result["data"];
    if output_format == "text" {
        if let Some(upid) = data.as_str() {
            display_task_log(client, upid, true).await?;
        }
    } else {
        format_and_print_result(&data, &output_format);
    }

    Ok(())
}

fn connect() -> Result<HttpClient, Error> {

    let uid = nix::unistd::Uid::current();

    let client = if uid.is_root()  {
        let ticket = assemble_rsa_ticket(private_auth_key(), "PBS", Some("root@pam"), None)?;
        HttpClient::new("localhost", "root@pam", Some(ticket))?
    } else {
        HttpClient::new("localhost", "root@pam", None)?
    };

    Ok(client)
}

fn datastore_commands() -> CommandLineInterface {

    use proxmox_backup::api2;

    let cmd_def = CliCommandMap::new()
        .insert("list", CliCommand::new(&api2::config::datastore::GET))
        .insert("create",
                CliCommand::new(&api2::config::datastore::POST)
                .arg_param(&["name", "path"])
        )
        .insert("remove",
                CliCommand::new(&api2::config::datastore::DELETE)
                .arg_param(&["name"])
                .completion_cb("name", config::datastore::complete_datastore_name)
        );

    cmd_def.into()
}


#[api(
   input: {
        properties: {
            store: {
                schema: DATASTORE_SCHEMA,
            },
            "output-format": {
                schema: OUTPUT_FORMAT,
                optional: true,
            },
        }
   }
)]
/// Start garbage collection for a specific datastore.
async fn start_garbage_collection(param: Value) -> Result<Value, Error> {

    let output_format = param["output-format"].as_str().unwrap_or("text").to_owned();

    let store = tools::required_string_param(&param, "store")?;

    let mut client = connect()?;

    let path = format!("api2/json/admin/datastore/{}/gc", store);

    let result = client.post(&path, None).await?;

    view_task_result(client, result, &output_format).await?;

    Ok(Value::Null)
}

#[api(
   input: {
        properties: {
            store: {
                schema: DATASTORE_SCHEMA,
            },
            "output-format": {
                schema: OUTPUT_FORMAT,
                optional: true,
            },
        }
   }
)]
/// Show garbage collection status for a specific datastore.
async fn garbage_collection_status(param: Value) -> Result<Value, Error> {

    let output_format = param["output-format"].as_str().unwrap_or("text").to_owned();

    let store = tools::required_string_param(&param, "store")?;

    let client = connect()?;

    let path = format!("api2/json/admin/datastore/{}/gc", store);

    let result = client.get(&path, None).await?;
    let data = &result["data"];
    if output_format == "text" {
        format_and_print_result(&data, "json-pretty");
     } else {
        format_and_print_result(&data, &output_format);
    }

    Ok(Value::Null)
}

fn garbage_collection_commands() -> CommandLineInterface {

    let cmd_def = CliCommandMap::new()
        .insert("status",
                CliCommand::new(&API_METHOD_GARBAGE_COLLECTION_STATUS)
                .arg_param(&["store"])
                .completion_cb("store", config::datastore::complete_datastore_name)
        )
        .insert("start",
                CliCommand::new(&API_METHOD_START_GARBAGE_COLLECTION)
                .arg_param(&["store"])
                .completion_cb("store", config::datastore::complete_datastore_name)
        );

    cmd_def.into()
}

#[api(
    input: {
        properties: {
            limit: {
                description: "The maximal number of tasks to list.",
                type: Integer,
                optional: true,
                minimum: 1,
                maximum: 1000,
                default: 50,
            },
            "output-format": {
                schema: OUTPUT_FORMAT,
                optional: true,
            },
            all: {
                type: Boolean,
                description: "Also list stopped tasks.",
                optional: true,
            }
        }
    }
)]
/// List running server tasks.
async fn task_list(param: Value) -> Result<Value, Error> {

    let output_format = param["output-format"].as_str().unwrap_or("text").to_owned();

    let client = connect()?;

    let limit = param["limit"].as_u64().unwrap_or(50) as usize;
    let running = !param["all"].as_bool().unwrap_or(false);
    let args = json!({
        "running": running,
        "start": 0,
        "limit": limit,
    });
    let result = client.get("api2/json/nodes/localhost/tasks", Some(args)).await?;

    let data = &result["data"];

    if output_format == "text" {
        for item in data.as_array().unwrap() {
            println!(
                "{} {}",
                item["upid"].as_str().unwrap(),
                item["status"].as_str().unwrap_or("running"),
            );
        }
    } else {
        format_and_print_result(data, &output_format);
    }

    Ok(Value::Null)
}

#[api(
    input: {
        properties: {
            upid: {
                schema: UPID_SCHEMA,
            },
        }
    }
)]
/// Display the task log.
async fn task_log(param: Value) -> Result<Value, Error> {

    let upid = tools::required_string_param(&param, "upid")?;

    let client = connect()?;

    display_task_log(client, upid, true).await?;

    Ok(Value::Null)
}

#[api(
    input: {
        properties: {
            upid: {
                schema: UPID_SCHEMA,
            },
        }
    }
)]
/// Try to stop a specific task.
async fn task_stop(param: Value) -> Result<Value, Error> {

    let upid_str = tools::required_string_param(&param, "upid")?;

    let mut client = connect()?;

    let path = format!("api2/json/nodes/localhost/tasks/{}", upid_str);
    let _ = client.delete(&path, None).await?;

    Ok(Value::Null)
}

fn task_mgmt_cli() -> CommandLineInterface {

    let task_log_cmd_def = CliCommand::new(&API_METHOD_TASK_LOG)
        .arg_param(&["upid"]);

    let task_stop_cmd_def = CliCommand::new(&API_METHOD_TASK_STOP)
        .arg_param(&["upid"]);

    let cmd_def = CliCommandMap::new()
        .insert("list", CliCommand::new(&API_METHOD_TASK_LIST))
        .insert("log", task_log_cmd_def)
        .insert("stop", task_stop_cmd_def);

    cmd_def.into()
}

fn main() {

    let cmd_def = CliCommandMap::new()
        .insert("datastore", datastore_commands())
        .insert("garbage-collection", garbage_collection_commands())
        .insert("task", task_mgmt_cli());

    run_cli_command(cmd_def);
}