//! Security management commands
//!
//! This module provides comprehensive security management functionality
//! including authentication, authorization, ACL management, and token operations.

use clap::ArgMatches;
use std::error::Error;
use serde_json::{json, Value};

/// Handle authentication setup command
pub async fn handle_auth_setup_command(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    let auth_type = matches.get_one::<String>("type").unwrap();
    let enable = matches.get_flag("enable");
    let disable = matches.get_flag("disable");

    if enable {
        println!("🔐 Enabling {} authentication...", auth_type);
    } else if disable {
        println!("🔓 Disabling {} authentication...", auth_type);
    } else {
        println!("🔍 Checking {} authentication status...", auth_type);
    }

    // Simulate authentication setup
    let setup_payload = json!({
        "auth_type": auth_type,
        "action": if enable { "enable" } else if disable { "disable" } else { "status" },
        "timestamp": chrono::Utc::now().to_rfc3339()
    });

    simulate_api_call("/api/security/auth", "POST", &setup_payload).await?;

    if enable || disable {
        println!("✅ Authentication configuration updated successfully!");
    } else {
        display_auth_status(auth_type).await?;
    }

    Ok(())
}

/// Handle ACL (Access Control List) commands
pub async fn handle_acl_command(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    match matches.subcommand() {
        Some(("list", sub_matches)) => handle_acl_list_command(sub_matches).await,
        Some(("add", sub_matches)) => handle_acl_add_command(sub_matches).await,
        Some(("remove", sub_matches)) => handle_acl_remove_command(sub_matches).await,
        _ => Err("Invalid ACL subcommand".into()),
    }
}

/// Handle token commands
pub async fn handle_token_command(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    match matches.subcommand() {
        Some(("create", sub_matches)) => handle_token_create_command(sub_matches).await,
        Some(("list", sub_matches)) => handle_token_list_command(sub_matches).await,
        Some(("revoke", sub_matches)) => handle_token_revoke_command(sub_matches).await,
        Some(("validate", sub_matches)) => handle_token_validate_command(sub_matches).await,
        _ => Err("Invalid token subcommand".into()),
    }
}

/// Handle certificate management commands
pub async fn handle_cert_command(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    match matches.subcommand() {
        Some(("generate", sub_matches)) => handle_cert_generate_command(sub_matches).await,
        Some(("list", sub_matches)) => handle_cert_list_command(sub_matches).await,
        Some(("renew", sub_matches)) => handle_cert_renew_command(sub_matches).await,
        _ => Err("Invalid certificate subcommand".into()),
    }
}

// ACL Commands
async fn handle_acl_list_command(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    let resource_type = matches.get_one::<String>("resource-type");
    let resource_name = matches.get_one::<String>("resource-name");

    println!("🔒 Listing ACLs...");

    let acls = simulate_get_acls(resource_type, resource_name).await?;
    display_acls(&acls)?;

    Ok(())
}

async fn handle_acl_add_command(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    let resource_type = matches.get_one::<String>("resource-type").unwrap();
    let resource_name = matches.get_one::<String>("resource-name").unwrap();
    let principal = matches.get_one::<String>("principal").unwrap();
    let operation = matches.get_one::<String>("operation").unwrap();
    let permission = if matches.get_flag("deny") { "deny" } else { "allow" };

    println!("➕ Adding ACL rule...");
    println!("   Resource: {} '{}'", resource_type, resource_name);
    println!("   Principal: {}", principal);
    println!("   Operation: {}", operation);
    println!("   Permission: {}", permission);

    let acl_payload = json!({
        "resource_type": resource_type,
        "resource_name": resource_name,
        "principal": principal,
        "operation": operation,
        "permission": permission,
        "timestamp": chrono::Utc::now().to_rfc3339()
    });

    simulate_api_call("/api/security/acl", "POST", &acl_payload).await?;

    println!("✅ ACL rule added successfully!");
    Ok(())
}

async fn handle_acl_remove_command(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    let resource_type = matches.get_one::<String>("resource-type").unwrap();
    let resource_name = matches.get_one::<String>("resource-name").unwrap();
    let principal = matches.get_one::<String>("principal").unwrap();
    let operation = matches.get_one::<String>("operation").unwrap();

    println!("➖ Removing ACL rule...");
    println!("   Resource: {} '{}'", resource_type, resource_name);
    println!("   Principal: {}", principal);
    println!("   Operation: {}", operation);

    let remove_payload = json!({
        "resource_type": resource_type,
        "resource_name": resource_name,
        "principal": principal,
        "operation": operation,
        "action": "remove"
    });

    simulate_api_call("/api/security/acl", "DELETE", &remove_payload).await?;

    println!("✅ ACL rule removed successfully!");
    Ok(())
}

// Token Commands
async fn handle_token_create_command(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    let principal = matches.get_one::<String>("principal").unwrap();
    let default_duration = "24h".to_string();
    let duration = matches.get_one::<String>("duration").unwrap_or(&default_duration);
    let scopes: Vec<&str> = matches.get_many::<String>("scope")
        .unwrap_or_default()
        .map(|s| s.as_str())
        .collect();

    println!("🎫 Creating new token...");
    println!("   Principal: {}", principal);
    println!("   Duration: {}", duration);
    println!("   Scopes: {:?}", scopes);

    let token_data = simulate_create_token(principal, duration, &scopes).await?;
    display_new_token(&token_data)?;

    Ok(())
}

async fn handle_token_list_command(_matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    println!("🎫 Listing active tokens...");

    let tokens = simulate_get_tokens().await?;
    display_tokens(&tokens)?;

    Ok(())
}

async fn handle_token_revoke_command(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    let token_id = matches.get_one::<String>("token-id").unwrap();

    println!("🚫 Revoking token '{}'...", token_id);

    let revoke_payload = json!({
        "token_id": token_id,
        "action": "revoke",
        "timestamp": chrono::Utc::now().to_rfc3339()
    });

    simulate_api_call(&format!("/api/security/tokens/{}", token_id), "DELETE", &revoke_payload).await?;

    println!("✅ Token revoked successfully!");
    Ok(())
}

async fn handle_token_validate_command(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    let token = matches.get_one::<String>("token").unwrap();

    println!("✅ Validating token...");

    let validation_result = simulate_validate_token(token).await?;
    display_token_validation(&validation_result)?;

    Ok(())
}

// Certificate Commands
async fn handle_cert_generate_command(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    let cert_type = matches.get_one::<String>("type").unwrap();
    let common_name = matches.get_one::<String>("common-name").unwrap();
    let default_validity = "365".to_string();
    let validity_days = matches.get_one::<String>("validity-days").unwrap_or(&default_validity);

    println!("📜 Generating {} certificate...", cert_type);
    println!("   Common Name: {}", common_name);
    println!("   Validity: {} days", validity_days);

    let cert_payload = json!({
        "type": cert_type,
        "common_name": common_name,
        "validity_days": validity_days.parse::<u32>().unwrap_or(365),
        "timestamp": chrono::Utc::now().to_rfc3339()
    });

    simulate_api_call("/api/security/certificates", "POST", &cert_payload).await?;

    println!("✅ Certificate generated successfully!");
    println!("📁 Certificate files saved to: ./certificates/{}/", common_name);
    Ok(())
}

async fn handle_cert_list_command(_matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    println!("📜 Listing certificates...");

    let certificates = simulate_get_certificates().await?;
    display_certificates(&certificates)?;

    Ok(())
}

async fn handle_cert_renew_command(matches: &ArgMatches) -> Result<(), Box<dyn Error>> {
    let cert_id = matches.get_one::<String>("cert-id").unwrap();

    println!("🔄 Renewing certificate '{}'...", cert_id);

    let renew_payload = json!({
        "cert_id": cert_id,
        "action": "renew",
        "timestamp": chrono::Utc::now().to_rfc3339()
    });

    simulate_api_call(&format!("/api/security/certificates/{}/renew", cert_id), "POST", &renew_payload).await?;

    println!("✅ Certificate renewed successfully!");
    Ok(())
}

// Helper functions
async fn simulate_api_call(endpoint: &str, method: &str, payload: &Value) -> Result<(), Box<dyn Error>> {
    // Simulate API call delay
    tokio::time::sleep(tokio::time::Duration::from_millis(200)).await;

    println!("📡 API Call: {} {}", method, endpoint);
    if method != "GET" {
        println!("📤 Payload: {}", serde_json::to_string_pretty(payload)?);
    }

    Ok(())
}

async fn display_auth_status(auth_type: &str) -> Result<(), Box<dyn Error>> {
    // Simulate fetching auth status
    tokio::time::sleep(tokio::time::Duration::from_millis(150)).await;

    println!();
    println!("🔐 Authentication Status: {}", auth_type);
    println!("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");

    match auth_type {
        "oauth" => {
            println!("   Status: 🟢 Enabled");
            println!("   Provider: Keycloak");
            println!("   Client ID: pilgrimage-broker");
            println!("   Token Validation: JWT");
            println!("   Expiry: 24 hours");
        },
        "mtls" => {
            println!("   Status: 🟡 Partially Enabled");
            println!("   Client Certificates: Required");
            println!("   CA Certificate: Present");
            println!("   Certificate Validation: Strict");
        },
        "basic" => {
            println!("   Status: 🔴 Disabled");
            println!("   Reason: Deprecated for production use");
        },
        _ => {
            println!("   Status: ❓ Unknown authentication type");
        }
    }

    println!();
    Ok(())
}

async fn simulate_get_acls(resource_type: Option<&String>, resource_name: Option<&String>) -> Result<Vec<Value>, Box<dyn Error>> {
    tokio::time::sleep(tokio::time::Duration::from_millis(200)).await;

    let mut acls = vec![
        json!({
            "id": "acl-001",
            "resource_type": "topic",
            "resource_name": "user-events",
            "principal": "User:analytics-service",
            "operation": "read",
            "permission": "allow",
            "created_at": "2024-01-15T10:30:00Z"
        }),
        json!({
            "id": "acl-002",
            "resource_type": "topic",
            "resource_name": "user-events",
            "principal": "User:admin",
            "operation": "*",
            "permission": "allow",
            "created_at": "2024-01-15T10:30:00Z"
        }),
        json!({
            "id": "acl-003",
            "resource_type": "consumer_group",
            "resource_name": "analytics-group",
            "principal": "User:analytics-service",
            "operation": "read",
            "permission": "allow",
            "created_at": "2024-01-20T14:45:00Z"
        }),
        json!({
            "id": "acl-004",
            "resource_type": "topic",
            "resource_name": "sensitive-data",
            "principal": "User:guest",
            "operation": "read",
            "permission": "deny",
            "created_at": "2024-01-25T09:15:00Z"
        })
    ];

    // Filter by resource type and name if provided
    if let Some(r_type) = resource_type {
        acls.retain(|acl| acl["resource_type"].as_str() == Some(r_type));
    }
    if let Some(r_name) = resource_name {
        acls.retain(|acl| acl["resource_name"].as_str() == Some(r_name));
    }

    Ok(acls)
}

async fn simulate_create_token(principal: &str, duration: &str, scopes: &[&str]) -> Result<Value, Box<dyn Error>> {
    tokio::time::sleep(tokio::time::Duration::from_millis(300)).await;

    Ok(json!({
        "token_id": "tok_abc123def456",
        "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJhbmFseXRpY3Mtc2VydmljZSIsImlhdCI6MTcwNTMxMjgwMCwiZXhwIjoxNzA1Mzk5MjAwfQ.example_signature",
        "principal": principal,
        "duration": duration,
        "scopes": scopes,
        "created_at": chrono::Utc::now().to_rfc3339(),
        "expires_at": chrono::Utc::now().checked_add_signed(chrono::Duration::hours(24)).unwrap().to_rfc3339()
    }))
}

async fn simulate_get_tokens() -> Result<Vec<Value>, Box<dyn Error>> {
    tokio::time::sleep(tokio::time::Duration::from_millis(200)).await;

    Ok(vec![
        json!({
            "token_id": "tok_abc123def456",
            "principal": "analytics-service",
            "scopes": ["topic:read", "group:read"],
            "created_at": "2024-01-15T10:30:00Z",
            "expires_at": "2024-01-16T10:30:00Z",
            "status": "active"
        }),
        json!({
            "token_id": "tok_xyz789uvw012",
            "principal": "admin",
            "scopes": ["*"],
            "created_at": "2024-01-10T08:00:00Z",
            "expires_at": "2024-02-10T08:00:00Z",
            "status": "active"
        }),
        json!({
            "token_id": "tok_old456789123",
            "principal": "backup-service",
            "scopes": ["topic:read"],
            "created_at": "2024-01-01T12:00:00Z",
            "expires_at": "2024-01-02T12:00:00Z",
            "status": "expired"
        })
    ])
}

async fn simulate_validate_token(_token: &str) -> Result<Value, Box<dyn Error>> {
    tokio::time::sleep(tokio::time::Duration::from_millis(150)).await;

    Ok(json!({
        "valid": true,
        "principal": "analytics-service",
        "scopes": ["topic:read", "group:read"],
        "issued_at": "2024-01-15T10:30:00Z",
        "expires_at": "2024-01-16T10:30:00Z",
        "remaining_time": "23h 45m",
        "token_id": "tok_abc123def456"
    }))
}

async fn simulate_get_certificates() -> Result<Vec<Value>, Box<dyn Error>> {
    tokio::time::sleep(tokio::time::Duration::from_millis(200)).await;

    Ok(vec![
        json!({
            "cert_id": "cert_broker_001",
            "type": "server",
            "common_name": "broker.pilgrimage.local",
            "issued_at": "2024-01-01T00:00:00Z",
            "expires_at": "2025-01-01T00:00:00Z",
            "status": "valid",
            "serial_number": "1234567890ABCDEF"
        }),
        json!({
            "cert_id": "cert_client_001",
            "type": "client",
            "common_name": "analytics-service",
            "issued_at": "2024-01-15T10:30:00Z",
            "expires_at": "2024-07-15T10:30:00Z",
            "status": "valid",
            "serial_number": "FEDCBA0987654321"
        }),
        json!({
            "cert_id": "cert_old_001",
            "type": "server",
            "common_name": "old-broker.pilgrimage.local",
            "issued_at": "2023-01-01T00:00:00Z",
            "expires_at": "2024-01-01T00:00:00Z",
            "status": "expired",
            "serial_number": "0123456789ABCDEF"
        })
    ])
}

fn display_acls(acls: &[Value]) -> Result<(), Box<dyn Error>> {
    println!();
    println!("┌─────────────┬────────────────┬────────────────┬─────────────────────┬───────────┬────────────┐");
    println!("│ ACL ID      │ Resource Type  │ Resource Name  │ Principal           │ Operation │ Permission │");
    println!("├─────────────┼────────────────┼────────────────┼─────────────────────┼───────────┼────────────┤");

    for acl in acls {
        let id = acl["id"].as_str().unwrap_or("Unknown");
        let resource_type = acl["resource_type"].as_str().unwrap_or("Unknown");
        let resource_name = acl["resource_name"].as_str().unwrap_or("Unknown");
        let principal = acl["principal"].as_str().unwrap_or("Unknown");
        let operation = acl["operation"].as_str().unwrap_or("Unknown");
        let permission = acl["permission"].as_str().unwrap_or("Unknown");

        let permission_icon = if permission == "allow" { "✅" } else { "❌" };

        println!("│ {:<11} │ {:<14} │ {:<14} │ {:<19} │ {:<9} │ {}{:<9} │",
                 id, resource_type, resource_name, principal, operation, permission_icon, permission);
    }

    println!("└─────────────┴────────────────┴────────────────┴─────────────────────┴───────────┴────────────┘");
    println!();

    Ok(())
}

fn display_new_token(token_data: &Value) -> Result<(), Box<dyn Error>> {
    println!();
    println!("🎫 New Token Created Successfully!");
    println!("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
    println!("Token ID: {}", token_data["token_id"].as_str().unwrap_or("Unknown"));
    println!("Principal: {}", token_data["principal"].as_str().unwrap_or("Unknown"));
    println!("Duration: {}", token_data["duration"].as_str().unwrap_or("Unknown"));
    println!("Scopes: {:?}", token_data["scopes"].as_array().unwrap_or(&vec![]));
    println!("Created: {}", token_data["created_at"].as_str().unwrap_or("Unknown"));
    println!("Expires: {}", token_data["expires_at"].as_str().unwrap_or("Unknown"));
    println!();
    println!("🔑 Token (store securely):");
    println!("{}", token_data["token"].as_str().unwrap_or("Error generating token"));
    println!();
    println!("⚠️  This token will not be shown again. Store it securely!");
    println!();

    Ok(())
}

fn display_tokens(tokens: &[Value]) -> Result<(), Box<dyn Error>> {
    println!();
    println!("┌─────────────────────┬─────────────────────┬─────────────────────┬─────────────────────┬──────────┐");
    println!("│ Token ID            │ Principal           │ Created             │ Expires             │ Status   │");
    println!("├─────────────────────┼─────────────────────┼─────────────────────┼─────────────────────┼──────────┤");

    for token in tokens {
        let token_id = token["token_id"].as_str().unwrap_or("Unknown");
        let principal = token["principal"].as_str().unwrap_or("Unknown");
        let created_at = token["created_at"].as_str().unwrap_or("Unknown");
        let expires_at = token["expires_at"].as_str().unwrap_or("Unknown");
        let status = token["status"].as_str().unwrap_or("Unknown");

        let status_icon = match status {
            "active" => "🟢",
            "expired" => "🔴",
            "revoked" => "🟡",
            _ => "⚫",
        };

        println!("│ {:<19} │ {:<19} │ {:<19} │ {:<19} │ {}{:<7} │",
                 token_id, principal, &created_at[..19], &expires_at[..19], status_icon, status);
    }

    println!("└─────────────────────┴─────────────────────┴─────────────────────┴─────────────────────┴──────────┘");
    println!();

    Ok(())
}

fn display_token_validation(validation: &Value) -> Result<(), Box<dyn Error>> {
    println!();
    println!("🔍 Token Validation Result");
    println!("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");

    let valid = validation["valid"].as_bool().unwrap_or(false);
    let validation_icon = if valid { "✅" } else { "❌" };

    println!("Status: {}{}", validation_icon, if valid { "Valid" } else { "Invalid" });

    if valid {
        println!("Token ID: {}", validation["token_id"].as_str().unwrap_or("Unknown"));
        println!("Principal: {}", validation["principal"].as_str().unwrap_or("Unknown"));
        println!("Scopes: {:?}", validation["scopes"].as_array().unwrap_or(&vec![]));
        println!("Issued: {}", validation["issued_at"].as_str().unwrap_or("Unknown"));
        println!("Expires: {}", validation["expires_at"].as_str().unwrap_or("Unknown"));
        println!("Remaining Time: {}", validation["remaining_time"].as_str().unwrap_or("Unknown"));
    }

    println!();
    Ok(())
}

fn display_certificates(certificates: &[Value]) -> Result<(), Box<dyn Error>> {
    println!();
    println!("┌─────────────────┬────────────┬─────────────────────────┬─────────────────────┬─────────────────────┬──────────┐");
    println!("│ Certificate ID  │ Type       │ Common Name             │ Issued              │ Expires             │ Status   │");
    println!("├─────────────────┼────────────┼─────────────────────────┼─────────────────────┼─────────────────────┼──────────┤");

    for cert in certificates {
        let cert_id = cert["cert_id"].as_str().unwrap_or("Unknown");
        let cert_type = cert["type"].as_str().unwrap_or("Unknown");
        let common_name = cert["common_name"].as_str().unwrap_or("Unknown");
        let issued_at = cert["issued_at"].as_str().unwrap_or("Unknown");
        let expires_at = cert["expires_at"].as_str().unwrap_or("Unknown");
        let status = cert["status"].as_str().unwrap_or("Unknown");

        let status_icon = match status {
            "valid" => "🟢",
            "expired" => "🔴",
            "revoked" => "🟡",
            _ => "⚫",
        };

        println!("│ {:<15} │ {:<10} │ {:<23} │ {:<19} │ {:<19} │ {}{:<7} │",
                 cert_id, cert_type, common_name, &issued_at[..19], &expires_at[..19], status_icon, status);
    }

    println!("└─────────────────┴────────────┴─────────────────────────┴─────────────────────┴─────────────────────┴──────────┘");
    println!();

    Ok(())
}
