use std::error::Error;
use std::fs;
use std::net::{Ipv4Addr, SocketAddrV4};
use serde::{Deserialize, Serialize};
use url::{Url};
use crate::api::APIErrorResponse;
use crate::{HostCommands, HostOverrideCommands};

pub async fn host_main(command: HostCommands, server: Url) -> Result<(), Box<dyn Error>> {
    match command {
        HostCommands::List {} => list_hosts(server).await,
        HostCommands::Create { name, network_id, role_id, ip_address, listen_port, lighthouse, relay, static_address } => create_host(name, network_id, role_id, ip_address, listen_port, lighthouse, relay, static_address, server).await,
        HostCommands::Lookup { id } => get_host(id, server).await,
        HostCommands::Delete { id } => delete_host(id, server).await,
        HostCommands::Update { id, listen_port, static_address, name, ip, role } => update_host(id, listen_port, static_address, name, ip, role, server).await,
        HostCommands::Block { id } => block_host(id, server).await,
        HostCommands::Enroll { id } => enroll_host(id, server).await,
        HostCommands::Overrides { command } => match command {
            HostOverrideCommands::List { id } => list_overrides(id, server).await,
            HostOverrideCommands::Set { id, key, boolean, string, numeric } => set_override(id, key, boolean, numeric, string, server).await,
            HostOverrideCommands::Unset { id, key } => unset_override(id, key, server).await
        }
    }
}

#[derive(Deserialize)]
pub struct HostListResp {
    pub data: Vec<Host>
}


#[derive(Serialize, Deserialize)]
pub struct HostMetadata {
    #[serde(rename = "lastSeenAt")]
    pub last_seen_at: String,
    pub version: String,
    pub platform: String,
    #[serde(rename = "updateAvailable")]
    pub update_available: bool,
}

#[derive(Serialize, Deserialize)]
pub struct Host {
    pub id: String,
    #[serde(rename = "organizationID")]
    pub organization_id: String,
    #[serde(rename = "networkID")]
    pub network_id: String,
    #[serde(rename = "roleID")]
    pub role_id: String,
    pub name: String,
    #[serde(rename = "ipAddress")]
    pub ip_address: String,
    #[serde(rename = "staticAddresses")]
    pub static_addresses: Vec<SocketAddrV4>,
    #[serde(rename = "listenPort")]
    pub listen_port: i64,
    #[serde(rename = "isLighthouse")]
    pub is_lighthouse: bool,
    #[serde(rename = "isRelay")]
    pub is_relay: bool,
    #[serde(rename = "createdAt")]
    pub created_at: String,
    #[serde(rename = "isBlocked")]
    pub is_blocked: bool,
    pub metadata: HostMetadata,
}

pub async fn list_hosts(server: Url) -> Result<(), Box<dyn Error>> {
    let client = reqwest::Client::new();

    // load session token
    let sess_token_store = dirs::config_dir().unwrap().join("tfcli-session.token");
    let session_token = fs::read_to_string(&sess_token_store)?;
    let auth_token_store = dirs::config_dir().unwrap().join("tfcli-auth.token");
    let auth_token = fs::read_to_string(&auth_token_store)?;

    let token = format!("{} {}", session_token, auth_token);

    let res = client.get(server.join("/v1/hosts")?).bearer_auth(token).send().await?;

    if res.status().is_success() {
        let resp: HostListResp = res.json().await?;

        for host in &resp.data {
            println!("                   Host: {} ({})", host.name, host.id);
            println!("           Organization: {}", host.organization_id);
            println!("                Network: {}", host.network_id);
            println!("                   Role: {}", host.role_id);
            println!("             IP Address: {}", host.ip_address);
            println!("       Static Addresses: {}", host.static_addresses.iter().map(|u| u.to_string()).collect::<Vec<_>>().join(", "));
            println!("            Listen Port: {}", host.listen_port);
            println!("                   Type: {}", if host.is_lighthouse { "Lighthouse" } else if host.is_relay { "Relay" } else { "Host" } );
            println!("                Blocked: {}", host.is_blocked);
            println!("              Last Seen: {}", host.metadata.last_seen_at);
            println!("         Client Version: {}", host.metadata.version);
            println!("               Platform: {}", host.metadata.platform);
            println!("Client Update Available: {}", host.metadata.update_available);
            println!("                Created: {}", host.created_at);
            println!();
        }

        if resp.data.is_empty() {
            println!("No hosts found");
        }
    } else {
        let resp: APIErrorResponse = res.json().await?;

        eprintln!("[error] Error listing hosts: {} {}", resp.errors[0].code, resp.errors[0].message);

        std::process::exit(1);
    }

    Ok(())
}


#[derive(Serialize, Deserialize)]
pub struct HostCreateBody {
    pub name: String,
    #[serde(rename = "networkID")]
    pub network_id: String,
    #[serde(rename = "roleID")]
    pub role_id: String,
    #[serde(rename = "ipAddress")]
    pub ip_address: Ipv4Addr,
    #[serde(rename = "listenPort")]
    pub listen_port: u16,
    #[serde(rename = "isLighthouse")]
    pub is_lighthouse: bool,
    #[serde(rename = "isRelay")]
    pub is_relay: bool,
    #[serde(rename = "staticAddresses")]
    pub static_addresses: Vec<SocketAddrV4>,
}


#[derive(Serialize, Deserialize)]
pub struct HostGetMetadata {}


#[derive(Serialize, Deserialize)]
pub struct HostGetResponse {
    pub data: Host,
    pub metadata: HostGetMetadata,
}

pub async fn create_host(name: String, network_id: String, role_id: String, ip_address: Ipv4Addr, listen_port: Option<u16>, lighthouse: bool, relay: bool, static_address: Option<SocketAddrV4>, server: Url) -> Result<(), Box<dyn Error>> {
    if lighthouse && relay {
        eprintln!("[error] Error creating host: a host cannot be both a lighthouse and a relay at the same time");
        std::process::exit(1);
    }

    if (lighthouse || relay) && static_address.is_none() {
        eprintln!("[error] Error creating host: a relay or lighthouse must have a static IP");
        std::process::exit(1);
    }

    if (lighthouse || relay) && listen_port.is_none() {
        eprintln!("[error] Error creating host: a relay or lighthouse must have a listen port");
        std::process::exit(1);
    }

    let client = reqwest::Client::new();

    // load session token
    let sess_token_store = dirs::config_dir().unwrap().join("tfcli-session.token");
    let session_token = fs::read_to_string(&sess_token_store)?;
    let auth_token_store = dirs::config_dir().unwrap().join("tfcli-auth.token");
    let auth_token = fs::read_to_string(&auth_token_store)?;

    let token = format!("{} {}", session_token, auth_token);

    let res = client.post(server.join(&format!("/v1/hosts"))?).json(&HostCreateBody {
        name,
        network_id,
        role_id,
        ip_address,
        listen_port: listen_port.unwrap_or(0),
        is_lighthouse: lighthouse,
        is_relay: relay,
        static_addresses: static_address.map_or(vec![], |u| vec![u]),
    }).bearer_auth(token).send().await?;

    if res.status().is_success() {
        let host: Host = res.json::<HostGetResponse>().await?.data;

        println!("                   Host: {} ({})", host.name, host.id);
        println!("           Organization: {}", host.organization_id);
        println!("                Network: {}", host.network_id);
        println!("                   Role: {}", host.role_id);
        println!("             IP Address: {}", host.ip_address);
        println!("       Static Addresses: {}", host.static_addresses.iter().map(|u| u.to_string()).collect::<Vec<_>>().join(", "));
        println!("            Listen Port: {}", host.listen_port);
        println!("                   Type: {}", if host.is_lighthouse { "Lighthouse" } else if host.is_relay { "Relay" } else { "Host" } );
        println!("                Blocked: {}", host.is_blocked);
        println!("              Last Seen: {}", host.metadata.last_seen_at);
        println!("         Client Version: {}", host.metadata.version);
        println!("               Platform: {}", host.metadata.platform);
        println!("Client Update Available: {}", host.metadata.update_available);
        println!("                Created: {}", host.created_at);
        println!();

    } else {
        let resp: APIErrorResponse = res.json().await?;

        eprintln!("[error] Error creating host: {} {}", resp.errors[0].code, resp.errors[0].message);

        std::process::exit(1);
    }

    Ok(())
}

pub async fn get_host(id: String, server: Url) -> Result<(), Box<dyn Error>> {
    let client = reqwest::Client::new();

    // load session token
    let sess_token_store = dirs::config_dir().unwrap().join("tfcli-session.token");
    let session_token = fs::read_to_string(&sess_token_store)?;
    let auth_token_store = dirs::config_dir().unwrap().join("tfcli-auth.token");
    let auth_token = fs::read_to_string(&auth_token_store)?;

    let token = format!("{} {}", session_token, auth_token);

    let res = client.get(server.join(&format!("/v1/hosts/{}", id))?).bearer_auth(token).send().await?;

    if res.status().is_success() {
        let host: Host = res.json::<HostGetResponse>().await?.data;

        println!("                   Host: {} ({})", host.name, host.id);
        println!("           Organization: {}", host.organization_id);
        println!("                Network: {}", host.network_id);
        println!("                   Role: {}", host.role_id);
        println!("             IP Address: {}", host.ip_address);
        println!("       Static Addresses: {}", host.static_addresses.iter().map(|u| u.to_string()).collect::<Vec<_>>().join(", "));
        println!("            Listen Port: {}", host.listen_port);
        println!("                   Type: {}", if host.is_lighthouse { "Lighthouse" } else if host.is_relay { "Relay" } else { "Host" } );
        println!("                Blocked: {}", host.is_blocked);
        println!("              Last Seen: {}", host.metadata.last_seen_at);
        println!("         Client Version: {}", host.metadata.version);
        println!("               Platform: {}", host.metadata.platform);
        println!("Client Update Available: {}", host.metadata.update_available);
        println!("                Created: {}", host.created_at);
        println!();

    } else {
        let resp: APIErrorResponse = res.json().await?;

        eprintln!("[error] Error listing hosts: {} {}", resp.errors[0].code, resp.errors[0].message);

        std::process::exit(1);
    }

    Ok(())
}

pub async fn delete_host(id: String, server: Url) -> Result<(), Box<dyn Error>> {
    let client = reqwest::Client::new();

    // load session token
    let sess_token_store = dirs::config_dir().unwrap().join("tfcli-session.token");
    let session_token = fs::read_to_string(&sess_token_store)?;
    let auth_token_store = dirs::config_dir().unwrap().join("tfcli-auth.token");
    let auth_token = fs::read_to_string(&auth_token_store)?;

    let token = format!("{} {}", session_token, auth_token);

    let res = client.delete(server.join(&format!("/v1/hosts/{}", id))?).bearer_auth(token).send().await?;

    if res.status().is_success() {
        println!("Host removed");
    } else {
        let resp: APIErrorResponse = res.json().await?;

        eprintln!("[error] Error removing host: {} {}", resp.errors[0].code, resp.errors[0].message);

        std::process::exit(1);
    }

    Ok(())
}

#[derive(Serialize, Deserialize)]
pub struct HostUpdateBody {
    #[serde(rename = "listenPort")]
    pub listen_port: u16,
    #[serde(rename = "staticAddresses")]
    pub static_addresses: Vec<SocketAddrV4>,
    pub name: Option<String>,
    pub ip: Option<Ipv4Addr>,
    pub role: Option<String>
}

pub async fn update_host(id: String, listen_port: Option<u16>, static_address: Option<SocketAddrV4>, name: Option<String>, ip: Option<Ipv4Addr>, role: Option<String>, server: Url) -> Result<(), Box<dyn Error>> {
    let client = reqwest::Client::new();

    // load session token
    let sess_token_store = dirs::config_dir().unwrap().join("tfcli-session.token");
    let session_token = fs::read_to_string(&sess_token_store)?;
    let auth_token_store = dirs::config_dir().unwrap().join("tfcli-auth.token");
    let auth_token = fs::read_to_string(&auth_token_store)?;

    let token = format!("{} {}", session_token, auth_token);

    let res = client.put(server.join(&format!("/v1/hosts/{}?extension=extended_hosts", id))?).json(&HostUpdateBody {
        listen_port: listen_port.unwrap_or(0),
        static_addresses: static_address.map_or_else(|| vec![], |u| vec![u]),
        name,
        ip,
        role
    }).bearer_auth(token).send().await?;

    if res.status().is_success() {
        let host: Host = res.json::<HostGetResponse>().await?.data;

        println!("                   Host: {} ({})", host.name, host.id);
        println!("           Organization: {}", host.organization_id);
        println!("                Network: {}", host.network_id);
        println!("                   Role: {}", host.role_id);
        println!("             IP Address: {}", host.ip_address);
        println!("       Static Addresses: {}", host.static_addresses.iter().map(|u| u.to_string()).collect::<Vec<_>>().join(", "));
        println!("            Listen Port: {}", host.listen_port);
        println!("                   Type: {}", if host.is_lighthouse { "Lighthouse" } else if host.is_relay { "Relay" } else { "Host" } );
        println!("                Blocked: {}", host.is_blocked);
        println!("              Last Seen: {}", host.metadata.last_seen_at);
        println!("         Client Version: {}", host.metadata.version);
        println!("               Platform: {}", host.metadata.platform);
        println!("Client Update Available: {}", host.metadata.update_available);
        println!("                Created: {}", host.created_at);
        println!();

    } else {
        let resp: APIErrorResponse = res.json().await?;

        eprintln!("[error] Error updating host: {} {}", resp.errors[0].code, resp.errors[0].message);

        std::process::exit(1);
    }

    Ok(())
}


#[derive(Serialize, Deserialize)]
pub struct EnrollmentCodeResponseMetadata {}

#[derive(Serialize, Deserialize)]
pub struct EnrollmentCode {
    pub code: String,
    #[serde(rename = "lifetimeSeconds")]
    pub lifetime_seconds: i64,
}

#[derive(Serialize, Deserialize)]
pub struct EnrollmentResponseData {
    #[serde(rename = "enrollmentCode")]
    pub enrollment_code: EnrollmentCode,
}

#[derive(Serialize, Deserialize)]
pub struct EnrollmentResponse {
    pub data: EnrollmentResponseData,
    pub metadata: EnrollmentCodeResponseMetadata,
}

pub async fn enroll_host(id: String, server: Url) -> Result<(), Box<dyn Error>> {
    let client = reqwest::Client::new();

    // load session token
    let sess_token_store = dirs::config_dir().unwrap().join("tfcli-session.token");
    let session_token = fs::read_to_string(&sess_token_store)?;
    let auth_token_store = dirs::config_dir().unwrap().join("tfcli-auth.token");
    let auth_token = fs::read_to_string(&auth_token_store)?;

    let token = format!("{} {}", session_token, auth_token);

    let res = client.post(server.join(&format!("/v1/hosts/{}/enrollment-code", id))?).bearer_auth(token).send().await?;

    if res.status().is_success() {
        let resp: EnrollmentResponse = res.json().await?;

        println!("Enrollment code generated. Enroll the host with the following code: {}", resp.data.enrollment_code.code);
        println!("This code will be valid for {} seconds, at which point you will need to generate a new code", resp.data.enrollment_code.lifetime_seconds);
        println!("If this host is blocked, a successful re-enrollment will unblock it.");
    } else {
        let resp: APIErrorResponse = res.json().await?;

        eprintln!("[error] Error blocking host: {} {}", resp.errors[0].code, resp.errors[0].message);

        std::process::exit(1);
    }

    Ok(())
}

pub async fn block_host(id: String, server: Url) -> Result<(), Box<dyn Error>> {
    let client = reqwest::Client::new();

    // load session token
    let sess_token_store = dirs::config_dir().unwrap().join("tfcli-session.token");
    let session_token = fs::read_to_string(&sess_token_store)?;
    let auth_token_store = dirs::config_dir().unwrap().join("tfcli-auth.token");
    let auth_token = fs::read_to_string(&auth_token_store)?;

    let token = format!("{} {}", session_token, auth_token);

    let res = client.post(server.join(&format!("/v1/hosts/{}/block", id))?).bearer_auth(token).send().await?;

    if res.status().is_success() {
        println!("Host blocked. To unblock it, re-enroll the host.");
    } else {
        let resp: APIErrorResponse = res.json().await?;

        eprintln!("[error] Error blocking host: {} {}", resp.errors[0].code, resp.errors[0].message);

        std::process::exit(1);
    }

    Ok(())
}

#[derive(Serialize, Deserialize)]
pub struct HostConfigOverrideResponse {
    pub data: HostConfigOverrideData
}

#[derive(Serialize, Deserialize)]
pub struct HostConfigOverrideData {
    pub overrides: Vec<HostConfigOverrideDataOverride>
}

#[derive(Serialize, Deserialize)]
pub struct HostConfigOverrideDataOverride {
    pub key: String,
    pub value: HostConfigOverrideDataOverrideValue
}

#[derive(Serialize, Deserialize)]
#[serde(untagged)]
pub enum HostConfigOverrideDataOverrideValue {
    Boolean(bool),
    Numeric(i64),
    Other(String)
}

pub async fn list_overrides(id: String, server: Url) -> Result<(), Box<dyn Error>> {
    let client = reqwest::Client::new();

    // load session token
    let sess_token_store = dirs::config_dir().unwrap().join("tfcli-session.token");
    let session_token = fs::read_to_string(&sess_token_store)?;
    let auth_token_store = dirs::config_dir().unwrap().join("tfcli-auth.token");
    let auth_token = fs::read_to_string(&auth_token_store)?;

    let token = format!("{} {}", session_token, auth_token);

    let res = client.get(server.join(&format!("/v1/hosts/{}/config-overrides", id))?).bearer_auth(token).send().await?;

    if res.status().is_success() {
        let resp: HostConfigOverrideResponse = res.json().await?;

        for c_override in &resp.data.overrides {
            println!("  Key: {}", c_override.key);
            println!("Value: {}", match &c_override.value {
                HostConfigOverrideDataOverrideValue::Boolean(v) => format!("bool:{}", v),
                HostConfigOverrideDataOverrideValue::Numeric(v) => format!("numeric:{}", v),
                HostConfigOverrideDataOverrideValue::Other(v) => format!("string:{}", v)
            });
        }

        if resp.data.overrides.is_empty() {
            println!("No overrides found");
        }
    } else {
        let resp: APIErrorResponse = res.json().await?;

        eprintln!("[error] Error looking up config overrides: {} {}", resp.errors[0].code, resp.errors[0].message);

        std::process::exit(1);
    }

    Ok(())
}

#[derive(Serialize, Deserialize)]
pub struct SetOverrideRequest {
    pub overrides: Vec<HostConfigOverrideDataOverride>
}

pub async fn set_override(id: String, key: String, boolean: Option<bool>, numeric: Option<i64>, other: Option<String>, server: Url) -> Result<(), Box<dyn Error>> {
    if boolean.is_none() && numeric.is_none() && other.is_none() {
        eprintln!("[error] no value provided: you must provide at least --boolean, --numeric, or --string");
        std::process::exit(1);
    } else if boolean.is_some() && numeric.is_some() || boolean.is_some() && other.is_some() || numeric.is_some() && other.is_some() {
        eprintln!("[error] multiple values provided: you must provide only one of --boolean, --numeric, or --string");
        std::process::exit(1);
    }

    let val;

    if let Some(v) = boolean {
        val = HostConfigOverrideDataOverrideValue::Boolean(v);
    } else if let Some(v) = numeric {
        val = HostConfigOverrideDataOverrideValue::Numeric(v);
    } else if let Some(v) = other {
        val = HostConfigOverrideDataOverrideValue::Other(v);
    } else {
        unreachable!();
    }

    let client = reqwest::Client::new();

    // load session token
    let sess_token_store = dirs::config_dir().unwrap().join("tfcli-session.token");
    let session_token = fs::read_to_string(&sess_token_store)?;
    let auth_token_store = dirs::config_dir().unwrap().join("tfcli-auth.token");
    let auth_token = fs::read_to_string(&auth_token_store)?;

    let token = format!("{} {}", session_token, auth_token);

    let res = client.get(server.join(&format!("/v1/hosts/{}/config-overrides", id))?).bearer_auth(token.clone()).send().await?;

    if res.status().is_success() {
        let resp: HostConfigOverrideResponse = res.json().await?;

        let mut others: Vec<HostConfigOverrideDataOverride> = vec![];

        for c_override in resp.data.overrides {
            if c_override.key != key {
                others.push(c_override);
            }
        }

        others.push(HostConfigOverrideDataOverride {
            key,
            value: val,
        });

        let res = client.put(server.join(&format!("/v1/hosts/{}/config-overrides", id))?).bearer_auth(token.clone()).json(&SetOverrideRequest {
            overrides: others,
        }).send().await?;

        if res.status().is_success() {
            let resp: HostConfigOverrideResponse = res.json().await?;

            for c_override in &resp.data.overrides {
                println!("  Key: {}", c_override.key);
                println!("Value: {}", match &c_override.value {
                    HostConfigOverrideDataOverrideValue::Boolean(v) => format!("bool:{}", v),
                    HostConfigOverrideDataOverrideValue::Numeric(v) => format!("numeric:{}", v),
                    HostConfigOverrideDataOverrideValue::Other(v) => format!("string:{}", v)
                });
            }

            if resp.data.overrides.is_empty() {
                println!("No overrides found");
            }

            println!("Override set successfully");
        } else {
            let resp: APIErrorResponse = res.json().await?;

            eprintln!("[error] Error setting config overrides: {} {}", resp.errors[0].code, resp.errors[0].message);

            std::process::exit(1);
        }
    } else {
        let resp: APIErrorResponse = res.json().await?;

        eprintln!("[error] Error setting config overrides: {} {}", resp.errors[0].code, resp.errors[0].message);

        std::process::exit(1);
    }

    Ok(())
}

pub async fn unset_override(id: String, key: String, server: Url) -> Result<(), Box<dyn Error>> {
    let client = reqwest::Client::new();

    // load session token
    let sess_token_store = dirs::config_dir().unwrap().join("tfcli-session.token");
    let session_token = fs::read_to_string(&sess_token_store)?;
    let auth_token_store = dirs::config_dir().unwrap().join("tfcli-auth.token");
    let auth_token = fs::read_to_string(&auth_token_store)?;

    let token = format!("{} {}", session_token, auth_token);

    let res = client.get(server.join(&format!("/v1/hosts/{}/config-overrides", id))?).bearer_auth(token.clone()).send().await?;

    if res.status().is_success() {
        let resp: HostConfigOverrideResponse = res.json().await?;

        let mut others: Vec<HostConfigOverrideDataOverride> = vec![];

        for c_override in resp.data.overrides {
            if c_override.key != key {
                others.push(c_override);
            }
        }

        let res = client.put(server.join(&format!("/v1/hosts/{}/config-overrides", id))?).bearer_auth(token.clone()).json(&SetOverrideRequest {
            overrides: others,
        }).send().await?;

        if res.status().is_success() {
            let resp: HostConfigOverrideResponse = res.json().await?;

            for c_override in &resp.data.overrides {
                println!("  Key: {}", c_override.key);
                println!("Value: {}", match &c_override.value {
                    HostConfigOverrideDataOverrideValue::Boolean(v) => format!("bool:{}", v),
                    HostConfigOverrideDataOverrideValue::Numeric(v) => format!("numeric:{}", v),
                    HostConfigOverrideDataOverrideValue::Other(v) => format!("string:{}", v)
                });
            }

            if resp.data.overrides.is_empty() {
                println!("No overrides found");
            }

            println!("Override unset successfully");
        } else {
            let resp: APIErrorResponse = res.json().await?;

            eprintln!("[error] Error unsetting config overrides: {} {}", resp.errors[0].code, resp.errors[0].message);

            std::process::exit(1);
        }
    } else {
        let resp: APIErrorResponse = res.json().await?;

        eprintln!("[error] Error unsetting config overrides: {} {}", resp.errors[0].code, resp.errors[0].message);

        std::process::exit(1);
    }

    Ok(())
}