use log::{debug, warn};
use maud::{html, PreEscaped};
use peach_lib::sbot::{SbotConfig, SbotStatus};
use rouille::{post_input, try_or_400, Request, Response};

use crate::{
    templates,
    utils::{
        flash::{FlashRequest, FlashResponse},
        sbot, theme,
    },
};

/// Read the status and configuration of the sbot.
/// Define fallback values if an error is returned from either read function.
fn read_status_and_config() -> (String, SbotConfig, String, String) {
    // retrieve go-sbot systemd process status
    let run_on_startup = if let Ok(status) = SbotStatus::read() {
        // if the read is ok, return the value or "disabled" if no value is set
        match status.boot_state {
            Some(state) => state,
            None => "disabled".to_string(),
        }
    } else {
        // if the read returns an error, set the value to "disabled"
        "disabled".to_string()
    };

    // retrieve sbot config parameters
    let sbot_config = match SbotConfig::read() {
        Ok(config) => config,
        // build default config if an error is returned from the read attempt
        Err(_) => SbotConfig::default(),
    };

    // split the listen address into ip and port
    let (ip, port) = match sbot_config.lis.find(':') {
        Some(index) => {
            let (ip, port) = sbot_config.lis.split_at(index);
            // remove the : from the port
            (ip.to_string(), port.replace(':', ""))
        }
        // if no ':' separator is found, assume an ip has been configured (without port)
        None => (sbot_config.lis.to_string(), String::new()),
    };

    (run_on_startup, sbot_config, ip, port)
}

/// Scuttlebutt settings menu template builder.
pub fn build_template(request: &Request) -> PreEscaped<String> {
    // check for flash cookies; will be (None, None) if no flash cookies are found
    let (flash_name, flash_msg) = request.retrieve_flash();

    let (run_on_startup, sbot_config, ip, port) = read_status_and_config();

    let menu_template = html! {
        (PreEscaped("<!-- SBOT CONFIGURATION FORM -->"))
        div class="card center" {
            form id="sbotConfig" class="center" action="/settings/scuttlebutt/configure" method="post" {
                div class="center" style="display: flex; flex-direction: column; margin-bottom: 2rem;" title="Number of hops to replicate" {
                    label for="hops" class="label-small font-gray" { "HOPS" }
                    div id="hops" style="display: flex; justify-content: space-evenly;" {
                        div {
                            @if sbot_config.hops == 0 {
                                input type="radio" id="hops_0" name="hops" value="0" checked;
                            } @else {
                                input type="radio" id="hops_0" name="hops" value="0";
                            }
                            label class="font-normal" for="hops_0" { "0" }
                        }
                        div {
                            @if sbot_config.hops == 1 {
                                input type="radio" id="hops_1" name="hops" value="1" checked;
                            } @else {
                                input type="radio" id="hops_1" name="hops" value="1";
                            }
                            label class="font-normal" for="hops_1" { "1" }
                        }
                        div {
                            @if sbot_config.hops == 2 {
                                input type="radio" id="hops_2" name="hops" value="2" checked;
                            } @else {
                                input type="radio" id="hops_2" name="hops" value="2";
                            }
                            label class="font-normal" for="hops_2" { "2" }
                        }
                        div {
                            @if sbot_config.hops == 3 {
                                input type="radio" id="hops_3" name="hops" value="3" checked;
                            } @else {
                                input type="radio" id="hops_3" name="hops" value="3";
                            }
                            label class="font-normal" for="hops_3" { "3" }
                        }
                        div {
                            @if sbot_config.hops == 4 {
                                input type="radio" id="hops_4" name="hops" value="4" checked;
                            } @else {
                                input type="radio" id="hops_4" name="hops" value="4";
                            }
                            label class="font-normal" for="hops_4" { "4" }
                        }
                    }
                }
                div class="center" style="display: flex; justify-content: space-between;" {
                    div style="display: flex; flex-direction: column; width: 60%; margin-bottom: 2rem;" title="IP address on which the sbot runs" {
                        label for="ip" class="label-small font-gray" { "IP ADDRESS" }
                        input type="text" id="ip" name="lis_ip" value=(ip);
                    }
                    div style="display: flex; flex-direction: column; width: 20%; margin-bottom: 2rem;" title="Port on which the sbot runs" {
                        label for="port" class="label-small font-gray" { "PORT" }
                        input type="text" id="port" name="lis_port" value=(port);
                    }
                }
                div class="center" style="display: flex; flex-direction: column; margin-bottom: 2rem;" title="Network key (aka 'caps key') to define the Scuttleverse in which the sbot operates in" {
                    label for="network_key" class="label-small font-gray" { "NETWORK KEY" }
                    input type="text" id="network_key" name="shscap" value=(sbot_config.shscap);
                }
                div class="center" style="display: flex; flex-direction: column; margin-bottom: 2rem;" title="Directory in which the sbot database is saved" {
                    label for="database_dir" class="label-small font-gray" { "DATABASE DIRECTORY" }
                    input type="text" id="database_dir" name="repo" value=(sbot_config.repo);
                }
                div class="center" {
                    @if sbot_config.enable_ebt {
                        input type="checkbox" id="ebtReplication" style="margin-bottom: 1rem;" name="enable_ebt" checked;
                    } @else {
                        input type="checkbox" id="ebtReplication" style="margin-bottom: 1rem;" name="enable_ebt";
                    }
                    label class="font-normal" for="ebtReplication" title="Enable Epidemic Broadcast Tree (EBT) replication instead of legacy replication" {
                        "Enable EBT Replication"
                    }
                    br;
                    @if sbot_config.localadv {
                        input type="checkbox" id="lanBroadcast" style="margin-bottom: 1rem;" name="localadv" checked;
                    } @else {
                        input type="checkbox" id="lanBroadcast" style="margin-bottom: 1rem;" name="localadv";
                    }
                    label class="font-normal" for="lanBroadcast" title="Broadcast the IP and port of this sbot instance so that local peers can discovery it and attempt to connect" {
                        "Enable LAN Broadcasting"
                    }
                    br;
                    @if sbot_config.localdiscov {
                        input type="checkbox" id="lanDiscovery" style="margin-bottom: 1rem;" name="localdiscov" checked;
                    } @else {
                        input type="checkbox" id="lanDiscovery" style="margin-bottom: 1rem;" name="localdiscov";
                    }
                    label class="font-normal" for="lanDiscovery" title="Listen for the presence of local peers and attempt to connect if found" { "Enable LAN Discovery" }
                    br;
                    @if run_on_startup == "enabled" {
                        input type="checkbox" id="startup" style="margin-bottom: 1rem;" name="startup" checked;
                    } @else {
                        input type="checkbox" id="startup" style="margin-bottom: 1rem;" name="startup";
                    }
                    label class="font-normal" for="startup" title="Run the pub automatically on system startup" { "Run pub when computer starts" }
                    br;
                    @if sbot_config.repair {
                        input type="checkbox" id="repair" name="repair" checked;
                    } @else {
                        input type="checkbox" id="repair" name="repair";
                    }
                    label class="font-normal" for="repair" title="Attempt to repair the filesystem when starting the pub" { "Attempt filesystem repair when pub starts" }
                }
                (PreEscaped("<!-- hidden input elements for all other config variables -->"))
                input type="hidden" id="debugdir" name="debugdir" value=(sbot_config.debugdir);
                input type="hidden" id="hmac" name="hmac" value=(sbot_config.hmac);
                input type="hidden" id="wslis" name="wslis" value=(sbot_config.wslis);
                input type="hidden" id="debuglis" name="debuglis" value=(sbot_config.debuglis);
                input type="hidden" id="promisc" name="promisc" value=(sbot_config.promisc);
                input type="hidden" id="nounixsock" name="nounixsock" value=(sbot_config.nounixsock);
                (PreEscaped("<!-- BUTTONS -->"))
                input id="saveConfig" class="button button-primary center" style="margin-top: 2rem;" type="submit" title="Save configuration parameters to file" value="Save";
                input id="saveRestartConfig" class="button button-primary center" type="submit" title="Save configuration parameters to file and then (re)start the pub" value="Save & Restart" formaction="/settings/scuttlebutt/configure/restart";
                a id="restoreDefaults" class="button button-warning center" href="/settings/scuttlebutt/configure/default" title="Restore default configuration parameters and save them to file" { "Restore Defaults" }
            }
            // render flash message if cookies were found in the request
            @if let (Some(name), Some(msg)) = (flash_name, flash_msg) {
                (PreEscaped("<!-- FLASH MESSAGE -->"))
                (templates::flash::build_template(name, msg))
            }
        }
    };

    // wrap the nav bars around the settings menu template content
    // parameters are template, title and back url
    let body = templates::nav::build_template(
        menu_template,
        "Scuttlebutt Settings",
        Some("/settings/scuttlebutt"),
    );

    // query the current theme so we can pass it into the base template builder
    let theme = theme::get_theme();

    // render the base template with the provided body
    templates::base::build_template(body, theme)
}

/// Parse the sbot configuration values and write to file.
pub fn handle_form(request: &Request, restart: bool) -> Response {
    // query the request body for form data
    // return a 400 error if the admin_id field is missing
    let data = try_or_400!(post_input!(request, {
        repo: String,
        debugdir: String,
        shscap: String,
        hmac: String,
        hops: u8,
        lis_ip: String,
        lis_port: String,
        wslis: String,
        debuglis: String,
        localadv: bool,
        localdiscov: bool,
        enable_ebt: bool,
        promisc: bool,
        nounixsock: bool,
        startup: bool,
        repair: bool,
    }));

    // concat the ip and port for listen address
    let lis = format!("{}:{}", data.lis_ip, data.lis_port);

    // instantiate `SbotConfig` from form data
    let config = SbotConfig {
        lis,
        hops: data.hops,
        repo: data.repo,
        debugdir: data.debugdir,
        shscap: data.shscap,
        localadv: data.localadv,
        localdiscov: data.localdiscov,
        hmac: data.hmac,
        wslis: data.wslis,
        debuglis: data.debuglis,
        enable_ebt: data.enable_ebt,
        promisc: data.promisc,
        nounixsock: data.nounixsock,
        repair: data.repair,
    };

    match data.startup {
        true => {
            debug!("Enabling go-sbot.service");
            if let Err(e) = sbot::system_sbot_cmd("enable") {
                warn!("Failed to enable go-sbot.service: {}", e)
            }
        }
        false => {
            debug!("Disabling go-sbot.service");
            if let Err(e) = sbot::system_sbot_cmd("disable") {
                warn!("Failed to disable go-sbot.service: {}", e)
            }
        }
    };

    // write config to file
    let (name, msg) = match SbotConfig::write(config) {
        Ok(_) => {
            // if `restart` query parameter is `true`, attempt sbot process (re)start
            if restart {
                // returns a tuple of (name, msg) based on the outcome (success or error)
                sbot::restart_sbot_process()
            } else {
                ("success".to_string(), "Updated configuration".to_string())
            }
        }
        Err(err) => (
            "error".to_string(),
            format!("Failed to update configuration: {}", err),
        ),
    };

    let (flash_name, flash_msg) = (format!("flash_name={}", name), format!("flash_msg={}", msg));

    Response::redirect_303("/settings/scuttlebutt/configure").add_flash(flash_name, flash_msg)
}