//! Public landing page & admin landing builder API.

use crate::auth::AdminUser;
use crate::error::{AppError, AppResult};
use crate::state::AppState;
use crate::store;
use axum::body::Body;
use axum::extract::{Multipart, Path, State};
use axum::http::header;
use axum::response::{IntoResponse, Redirect, Response};
use axum::Json;
use serde::{Deserialize, Serialize};
use std::path::PathBuf;

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(default)]
pub struct HostedDownload {
    pub platform: String, // "windows", "mac", "linux"
    pub label: String,
    pub filename: String,
    pub file_url: String,
    pub size: i64,
    pub uploaded_at: String,
}

impl Default for HostedDownload {
    fn default() -> Self {
        Self {
            platform: "windows".into(),
            label: "Windows".into(),
            filename: "".into(),
            file_url: "".into(),
            size: 0,
            uploaded_at: "".into(),
        }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(default)]
pub struct FaqItem {
    pub id: String,
    pub question: String,
    pub answer: String,
}

impl Default for FaqItem {
    fn default() -> Self {
        Self { id: "".into(), question: "".into(), answer: "".into() }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(default)]
pub struct LandingBlock {
    pub id: String,
    #[serde(rename = "type")]
    pub block_type: String, // "hero", "download", "servers", "leaderboard", "stats", "instances", "news", "faq", "socials"
    pub enabled: bool,
    pub title: Option<String>,
    pub subtitle: Option<String>,
    pub options: serde_json::Value,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(default)]
pub struct LandingTheme {
    pub background: String,
    pub surface: String,
    pub accent: String,
    pub text: String,
    pub muted: String,
    pub max_width: u16,
    pub radius: u8,
    pub font: String,
    pub footer_text: String,
}

impl Default for LandingTheme {
    fn default() -> Self {
        Self {
            background: "#090a0f".into(),
            surface: "#151620".into(),
            accent: "#6d6af5".into(),
            text: "#f1f2f6".into(),
            muted: "#8b8f9a".into(),
            max_width: 1140,
            radius: 14,
            font: "Inter".into(),
            footer_text: "Your worlds, one click away.".into(),
        }
    }
}

impl Default for LandingBlock {
    fn default() -> Self {
        Self { id: "".into(), block_type: "hero".into(), enabled: true, title: None, subtitle: None, options: serde_json::json!({}) }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
#[serde(default)]
pub struct LandingConfig {
    pub enabled: bool,
    pub brand_name: String,
    pub logo_url: Option<String>,
    pub tagline: String,
    pub hero_title: String,
    pub hero_subtitle: String,
    pub hero_cta_text: String,
    pub hero_bg_type: String, // "gradient", "image", "video"
    pub hero_bg_url: Option<String>,
    pub server_ip: String,
    pub server_port: u16,
    pub hosted_downloads: Vec<HostedDownload>,
    pub external_download_url: Option<String>,
    pub blocks: Vec<LandingBlock>,
    pub faqs: Vec<FaqItem>,
    pub custom_css: String,
    pub theme: LandingTheme,
}

impl Default for LandingConfig {
    fn default() -> Self {
        Self {
            enabled: true,
            brand_name: "SCOPENET".into(),
            logo_url: None,
            tagline: "Your worlds, one click away.".into(),
            hero_title: "The Ultimate Minecraft Experience".into(),
            hero_subtitle: "Custom instances, automated modpack sync, zero hassle. Download the launcher and dive straight into our servers.".into(),
            hero_cta_text: "Download Launcher".into(),
            hero_bg_type: "gradient".into(),
            hero_bg_url: None,
            server_ip: "".into(),
            server_port: 25565,
            hosted_downloads: vec![],
            external_download_url: None,
            blocks: vec![
                LandingBlock { id: "b_hero".into(), block_type: "hero".into(), enabled: true, title: None, subtitle: None, options: serde_json::json!({}) },
                LandingBlock { id: "b_download".into(), block_type: "download".into(), enabled: true, title: Some("Get the Launcher".into()), subtitle: Some("Available on Windows, macOS, and Linux".into()), options: serde_json::json!({}) },
                LandingBlock { id: "b_servers".into(), block_type: "servers".into(), enabled: true, title: Some("Live Servers".into()), subtitle: Some("Check our current status and join the game".into()), options: serde_json::json!({}) },
                LandingBlock { id: "b_stats".into(), block_type: "stats".into(), enabled: true, title: Some("Community By Numbers".into()), subtitle: Some("Every block placed, every second played".into()), options: serde_json::json!({}) },
                LandingBlock { id: "b_leaderboard".into(), block_type: "leaderboard".into(), enabled: true, title: Some("Top Players".into()), subtitle: Some("The champions of our network".into()), options: serde_json::json!({}) },
                LandingBlock { id: "b_instances".into(), block_type: "instances".into(), enabled: true, title: Some("Featured Instances".into()), subtitle: Some("Hand-crafted modpacks ready to launch".into()), options: serde_json::json!({}) },
                LandingBlock { id: "b_news".into(), block_type: "news".into(), enabled: true, title: Some("Latest News".into()), subtitle: Some("Updates, events, and patch notes".into()), options: serde_json::json!({}) },
                LandingBlock { id: "b_faq".into(), block_type: "faq".into(), enabled: true, title: Some("Frequently Asked Questions".into()), subtitle: Some("Everything you need to know".into()), options: serde_json::json!({}) },
                LandingBlock { id: "b_socials".into(), block_type: "socials".into(), enabled: true, title: Some("Join Our Community".into()), subtitle: Some("Connect with thousands of players".into()), options: serde_json::json!({}) },
            ],
            faqs: vec![
                FaqItem {
                    id: "faq_1".into(),
                    question: "How do I start playing?".into(),
                    answer: "Download our custom launcher, sign in or create an account, select an instance and hit Play! All mods and Java runtimes download automatically.".into(),
                },
                FaqItem {
                    id: "faq_2".into(),
                    question: "Do I need to install Java manually?".into(),
                    answer: "No. The SCOPENET launcher automatically detects, downloads, and isolates the exact Java runtime required for each Minecraft version.".into(),
                },
                FaqItem {
                    id: "faq_3".into(),
                    question: "Can I customize my skin and cape?".into(),
                    answer: "Yes! In the launcher settings, you can upload HD skins, choose arm styles, pick your earned capes, and save multiple wardrobe presets to swap anytime.".into(),
                },
            ],
            custom_css: "".into(),
            theme: LandingTheme::default(),
        }
    }
}

pub async fn get_config(state: &AppState) -> AppResult<LandingConfig> {
    store::kv_get(state, "landing_page").await
}

pub async fn public_landing(State(state): State<AppState>) -> AppResult<Json<LandingConfig>> {
    let mut cfg = get_config(&state).await?;
    // If branding has been configured, adopt brand name & tagline if default
    if let Ok(branding) = store::branding(&state).await {
        if cfg.brand_name == "SCOPENET" && !branding.name.is_empty() {
            cfg.brand_name = branding.name;
        }
        if cfg.tagline == "Your worlds, one click away." && !branding.tagline.is_empty() {
            cfg.tagline = branding.tagline;
        }
    }
    // If server ip is empty, try to populate from first server
    if cfg.server_ip.is_empty() {
        if let Ok(Some(first_server)) =
            sqlx::query_scalar::<_, String>("SELECT address FROM game_servers ORDER BY id ASC LIMIT 1").fetch_optional(&state.db).await
        {
            cfg.server_ip = first_server;
        }
    }
    Ok(Json(cfg))
}

pub async fn admin_get_landing(_: AdminUser, State(state): State<AppState>) -> AppResult<Json<LandingConfig>> {
    Ok(Json(get_config(&state).await?))
}

pub async fn admin_put_landing(
    _: AdminUser,
    State(state): State<AppState>,
    Json(cfg): Json<LandingConfig>,
) -> AppResult<Json<LandingConfig>> {
    if cfg.blocks.len() > 100 || cfg.custom_css.len() > 100_000 {
        return Err(AppError::bad_request("landing page exceeds the editor limits"));
    }
    let mut ids = std::collections::HashSet::new();
    for block in &cfg.blocks {
        if block.id.is_empty() || !ids.insert(&block.id) {
            return Err(AppError::bad_request("landing section IDs must be unique"));
        }
    }
    store::kv_set(&state, "landing_page", &cfg).await?;
    Ok(Json(cfg))
}

pub async fn upload_launcher(_: AdminUser, State(state): State<AppState>, mut form: Multipart) -> AppResult<Json<LandingConfig>> {
    let mut platform = String::from("windows");
    let mut label = String::from("Windows Installer");
    let mut filename = String::new();
    let mut file_bytes = Vec::new();

    while let Some(field) = form.next_field().await? {
        match field.name().unwrap_or_default() {
            "platform" => platform = field.text().await?,
            "label" => label = field.text().await?,
            "file" => {
                if let Some(f_name) = field.file_name() {
                    filename = f_name.to_string();
                }
                file_bytes = field.bytes().await?.to_vec();
            }
            _ => {}
        }
    }

    if file_bytes.is_empty() {
        return Err(AppError::bad_request("no launcher file was uploaded"));
    }
    if filename.is_empty() {
        filename = format!("scopenet-launcher-{platform}");
    }

    // Sanitize filename to prevent directory traversal
    let safe_name =
        PathBuf::from(&filename).file_name().map(|s| s.to_string_lossy().to_string()).unwrap_or_else(|| format!("launcher-{platform}"));

    let dir = state.cfg.downloads_dir();
    tokio::fs::create_dir_all(&dir).await?;
    let target = dir.join(&safe_name);
    tokio::fs::write(&target, &file_bytes).await?;

    let size = file_bytes.len() as i64;
    let file_url = format!("/download/launcher/{platform}");

    let mut cfg = get_config(&state).await?;
    let ts = chrono::Utc::now().to_rfc3339_opts(chrono::SecondsFormat::Secs, true);

    let download_entry = HostedDownload { platform: platform.clone(), label, filename: safe_name, file_url, size, uploaded_at: ts };

    if let Some(idx) = cfg.hosted_downloads.iter().position(|d| d.platform == platform) {
        cfg.hosted_downloads[idx] = download_entry;
    } else {
        cfg.hosted_downloads.push(download_entry);
    }

    store::kv_set(&state, "landing_page", &cfg).await?;
    Ok(Json(cfg))
}

pub async fn download_launcher(State(state): State<AppState>, Path(platform): Path<String>) -> AppResult<Response> {
    let cfg = get_config(&state).await?;
    let entry = cfg.hosted_downloads.iter().find(|d| d.platform == platform || d.platform == "all");

    if let Some(d) = entry {
        let file_path = state.cfg.downloads_dir().join(&d.filename);
        if file_path.exists() {
            let bytes = tokio::fs::read(&file_path).await?;
            let cd = format!("attachment; filename=\"{}\"", d.filename);
            let mime = if d.filename.ends_with(".exe") || d.filename.ends_with(".msi") {
                "application/x-msdownload"
            } else if d.filename.ends_with(".dmg") {
                "application/x-apple-diskimage"
            } else if d.filename.ends_with(".deb") {
                "application/vnd.debian.binary-package"
            } else if d.filename.ends_with(".AppImage") {
                "application/x-executable"
            } else {
                "application/octet-stream"
            };
            return Ok(([(header::CONTENT_TYPE, mime), (header::CONTENT_DISPOSITION, cd.as_str())], Body::from(bytes)).into_response());
        }
    }

    if let Some(ext) = cfg.external_download_url.filter(|u| !u.is_empty()) {
        return Ok(Redirect::temporary(&ext).into_response());
    }

    Err(AppError::not_found("no launcher download available for this platform yet"))
}