// Docker Package Scanner
// Scans docker-compose containers and converts them to package data

use anyhow::Result;
use archipelago_container::{ContainerRuntime as ContainerRuntimeTrait, ContainerState};
use std::collections::HashMap;
use std::sync::Arc;
use tracing::{debug, info};

use crate::data_model::{
    Description, InstalledPackageDataEntry, InterfaceAddress, Interfaces, MainInterface, Manifest,
    PackageDataEntry, PackageState, ServiceStatus, StaticFiles,
};

pub struct DockerPackageScanner {
    runtime: Arc<dyn ContainerRuntimeTrait>,
}

impl DockerPackageScanner {
    pub fn new(runtime: Arc<dyn ContainerRuntimeTrait>) -> Self {
        Self { runtime }
    }

    /// Scan Docker containers and convert to package data
    pub async fn scan_containers(&self) -> Result<HashMap<String, PackageDataEntry>> {
        let containers = self.runtime.list_containers().await?;
        
        debug!("Found {} containers", containers.len());
        
        let mut packages = HashMap::new();
        
        // Backend services that should not appear as apps
        let excluded_services = [
            "btcpay-db",
            "mempool-db",
            "mempool-api",
            "penpot-db",
            "penpot-backend",
            "penpot-redis",
            "bitcoin-ui",
            "lnd-ui",
        ];
        
        for container in containers {
            // Only process archy-* containers from docker-compose
            if !container.name.starts_with("archy-") {
                continue;
            }
            
            // Extract app ID from container name (archy-bitcoin -> bitcoin)
            let app_id = container.name.strip_prefix("archy-")
                .unwrap_or(&container.name)
                .to_string();
            
            // Skip backend services (databases, APIs, etc.)
            if excluded_services.contains(&app_id.as_str()) {
                debug!("Skipping backend service: {}", app_id);
                continue;
            }
            
            // Get metadata for this app
            let metadata = get_app_metadata(&app_id);
            
            // Extract port from container
            let lan_address = extract_lan_address(&container.ports);
            
            // Convert container state to package/service state
            let (package_state, service_status) = convert_state(&container.state);
            
            let package = PackageDataEntry {
                state: package_state.clone(),
                static_files: StaticFiles {
                    license: "MIT".to_string(),
                    instructions: metadata.description.clone(),
                    icon: metadata.icon.clone(),
                },
                manifest: Manifest {
                    id: app_id.clone(),
                    title: metadata.title.clone(),
                    version: "1.0.0".to_string(),
                    description: Description {
                        short: metadata.description.clone(),
                        long: metadata.description.clone(),
                    },
                    release_notes: "Docker container".to_string(),
                    license: "MIT".to_string(),
                    wrapper_repo: metadata.repo.clone(),
                    upstream_repo: metadata.repo.clone(),
                    support_site: metadata.repo.clone(),
                    marketing_site: metadata.repo.clone(),
                    donation_url: None,
                    author: Some("Archipelago".to_string()),
                    website: lan_address.clone(),
                    interfaces: if lan_address.is_some() {
                        Some(Interfaces {
                            main: Some(MainInterface {
                                ui: Some("true".to_string()),
                                tor_config: None,
                                lan_config: None,
                            }),
                        })
                    } else {
                        None
                    },
                },
                installed: Some(InstalledPackageDataEntry {
                    current_dependents: HashMap::new(),
                    current_dependencies: HashMap::new(),
                    last_backup: None,
                    interface_addresses: if let Some(addr) = lan_address {
                        let mut addresses = HashMap::new();
                        addresses.insert(
                            "main".to_string(),
                            InterfaceAddress {
                                tor_address: format!("{}.onion", app_id),
                                lan_address: Some(addr),
                            },
                        );
                        addresses
                    } else {
                        HashMap::new()
                    },
                    status: service_status,
                }),
                install_progress: None,
            };
            
            packages.insert(app_id.clone(), package);
            info!("Detected container: {} ({})", metadata.title, package_state_str(&package_state));
        }
        
        Ok(packages)
    }
}

struct AppMetadata {
    title: String,
    description: String,
    icon: String,
    repo: String,
}

fn get_app_metadata(app_id: &str) -> AppMetadata {
    match app_id {
        "bitcoin" => AppMetadata {
            title: "Bitcoin Core".to_string(),
            description: "Full Bitcoin node implementation".to_string(),
            icon: "/assets/img/app-icons/bitcoin.svg".to_string(),
            repo: "https://github.com/bitcoin/bitcoin".to_string(),
        },
        "btcpay" | "btcpay-server" => AppMetadata {
            title: "BTCPay Server".to_string(),
            description: "Self-hosted Bitcoin payment processor".to_string(),
            icon: "/assets/img/app-icons/btcpay-server.png".to_string(),
            repo: "https://github.com/btcpayserver/btcpayserver".to_string(),
        },
        "homeassistant" => AppMetadata {
            title: "Home Assistant".to_string(),
            description: "Open source home automation platform".to_string(),
            icon: "/assets/img/app-icons/homeassistant.png".to_string(),
            repo: "https://github.com/home-assistant/core".to_string(),
        },
        "grafana" => AppMetadata {
            title: "Grafana".to_string(),
            description: "Analytics and monitoring platform".to_string(),
            icon: "/assets/img/grafana.png".to_string(),
            repo: "https://github.com/grafana/grafana".to_string(),
        },
        "endurain" => AppMetadata {
            title: "Endurain".to_string(),
            description: "Application platform".to_string(),
            icon: "/assets/img/endurain.png".to_string(),
            repo: "#".to_string(),
        },
        "fedimint" => AppMetadata {
            title: "Fedimint".to_string(),
            description: "Federated Bitcoin mint".to_string(),
            icon: "/assets/img/icon-fedimint.jpeg".to_string(),
            repo: "https://github.com/fedimint/fedimint".to_string(),
        },
        "morphos" | "morphos-server" => AppMetadata {
            title: "MorphOS Server".to_string(),
            description: "Server platform".to_string(),
            icon: "/assets/img/morphos.png".to_string(),
            repo: "#".to_string(),
        },
        "lnd" | "lightning-stack" => AppMetadata {
            title: "Lightning Stack".to_string(),
            description: "Lightning Network (LND)".to_string(),
            icon: "/assets/img/app-icons/lightning-stack.png".to_string(),
            repo: "https://github.com/lightningnetwork/lnd".to_string(),
        },
        "mempool" | "mempool-web" => AppMetadata {
            title: "Mempool".to_string(),
            description: "Bitcoin blockchain explorer".to_string(),
            icon: "/assets/img/app-icons/mempool.png".to_string(),
            repo: "https://github.com/mempool/mempool".to_string(),
        },
        "ollama" => AppMetadata {
            title: "Ollama".to_string(),
            description: "Run large language models locally".to_string(),
            icon: "/assets/img/ollama.webp".to_string(),
            repo: "https://github.com/ollama/ollama".to_string(),
        },
        "searxng" => AppMetadata {
            title: "SearXNG".to_string(),
            description: "Privacy-respecting metasearch engine".to_string(),
            icon: "/assets/img/app-icons/searxng.png".to_string(),
            repo: "https://github.com/searxng/searxng".to_string(),
        },
        "onlyoffice" | "onlyoffice-documentserver" => AppMetadata {
            title: "OnlyOffice".to_string(),
            description: "Office suite and document collaboration".to_string(),
            icon: "/assets/img/onlyoffice.webp".to_string(),
            repo: "https://github.com/ONLYOFFICE/DocumentServer".to_string(),
        },
        "penpot" | "penpot-frontend" => AppMetadata {
            title: "Penpot".to_string(),
            description: "Open-source design and prototyping".to_string(),
            icon: "/assets/img/penpot.webp".to_string(),
            repo: "https://github.com/penpot/penpot".to_string(),
        },
        _ => AppMetadata {
            title: app_id.to_string(),
            description: format!("{} application", app_id),
            icon: "/assets/img/favico.png".to_string(),
            repo: "#".to_string(),
        },
    }
}

fn extract_lan_address(ports: &[String]) -> Option<String> {
    for port_str in ports {
        // Parse port strings like "0.0.0.0:18443->18443/tcp" or "0.0.0.0:18443-18444->18443-18444/tcp"
        if let Some(public_part) = port_str.split("->").next() {
            if let Some(port_part) = public_part.split(':').nth(1) {
                // Extract just the first port if it's a range (e.g., "18443-18444" -> "18443")
                let single_port = port_part.split('-').next().unwrap_or(port_part);
                return Some(format!("http://localhost:{}", single_port));
            }
        }
    }
    None
}

fn convert_state(container_state: &ContainerState) -> (PackageState, ServiceStatus) {
    match container_state {
        ContainerState::Running => (PackageState::Running, ServiceStatus::Running),
        ContainerState::Stopped | ContainerState::Exited => {
            (PackageState::Stopped, ServiceStatus::Stopped)
        }
        ContainerState::Created => (PackageState::Starting, ServiceStatus::Starting),
        ContainerState::Paused => (PackageState::Stopped, ServiceStatus::Stopped),
        ContainerState::Unknown(_) => (PackageState::Stopped, ServiceStatus::Stopped),
    }
}

fn package_state_str(state: &PackageState) -> &str {
    match state {
        PackageState::Installing => "installing",
        PackageState::Installed => "installed",
        PackageState::Stopping => "stopping",
        PackageState::Stopped => "stopped",
        PackageState::Starting => "starting",
        PackageState::Running => "running",
        PackageState::Restarting => "restarting",
        PackageState::CreatingBackup => "creating-backup",
        PackageState::RestoringBackup => "restoring-backup",
        PackageState::Removing => "removing",
        PackageState::BackingUp => "backing-up",
    }
}