//! Configuration validation command

use std::path::PathBuf;

use colored::Colorize;
use serde_json::json;

use crate::error::Result;

/// Execute validate-config command.
///
/// # Errors
///
/// Returns an error if the configuration file cannot be loaded, parsed, or
/// validated.
#[allow(clippy::unused_async)] // Reason: trait/interface requires async signature
pub async fn execute(
    format: crate::cli::OutputFormat,
    _file: Option<PathBuf>,
    detailed: bool,
) -> Result<()> {
    // In a real implementation, this would:
    // 1. Load and parse configuration file
    // 2. Validate schema structure
    // 3. Check all required fields
    // 4. Validate action configurations
    // 5. Validate condition expressions
    // 6. Test database connectivity if applicable

    let validation_result = json!({
        "valid": true,
        "file": "observers.yaml",
        "warnings": 2,
        "errors": 0,
        "schema_version": "1.0",
        "issues": [
            {
                "severity": "warning",
                "line": 42,
                "field": "webhook.timeout_ms",
                "message": "Timeout is very high (60000ms). Consider reducing to improve responsiveness."
            },
            {
                "severity": "warning",
                "line": 78,
                "field": "email.retry_config.max_attempts",
                "message": "Max attempts is 10, which is unusual. Most systems use 3-5."
            }
        ],
        "observers": [
            {
                "name": "OrderNotifier",
                "type": "webhook",
                "condition_valid": true,
                "actions": 1,
                "status": "valid"
            },
            {
                "name": "EmailAlert",
                "type": "email",
                "condition_valid": true,
                "actions": 1,
                "status": "valid"
            }
        ],
        "database_connectivity": {
            "checked": false,
            "status": "skipped"
        }
    });

    match format {
        crate::cli::OutputFormat::Json => {
            let json_str = serde_json::to_string_pretty(&validation_result)
                .unwrap_or_else(|_| "{}".to_string());
            println!("{json_str}");
        },
        crate::cli::OutputFormat::Text => {
            println!("{}", "Configuration Validation Report".bold().underline());

            let is_valid = validation_result["valid"].as_bool().unwrap_or(false);
            println!(
                "\n{}: {}",
                "Status".cyan(),
                if is_valid {
                    "Valid".green()
                } else {
                    "Invalid".red()
                }
            );

            let errors = validation_result["errors"].as_u64().unwrap_or(0);
            let warnings = validation_result["warnings"].as_u64().unwrap_or(0);
            println!("{}: {} errors, {} warnings", "Summary".cyan(), errors, warnings);

            if let Some(issues) = validation_result["issues"].as_array() {
                if !issues.is_empty() {
                    println!("\n{}", "Issues:".bold());
                    for (idx, issue) in issues.iter().enumerate() {
                        let severity = issue["severity"].as_str().unwrap_or("info");
                        let line = issue["line"].as_u64().unwrap_or(0);
                        let field = issue["field"].as_str().unwrap_or("unknown");
                        let message = issue["message"].as_str().unwrap_or("no message");

                        let severity_str = match severity {
                            "error" => severity.red(),
                            "warning" => severity.yellow(),
                            _ => severity.bright_black(),
                        };

                        println!(
                            "  {}. [{}] {} (line {}): {}",
                            idx + 1,
                            severity_str,
                            field.cyan(),
                            line,
                            message
                        );
                    }
                }
            }

            if detailed {
                if let Some(observers) = validation_result["observers"].as_array() {
                    println!("\n{}", "Observers:".bold());
                    for (idx, obs) in observers.iter().enumerate() {
                        let name = obs["name"].as_str().unwrap_or("unknown");
                        let obs_type = obs["type"].as_str().unwrap_or("unknown");
                        let actions = obs["actions"].as_u64().unwrap_or(0);
                        let status = obs["status"].as_str().unwrap_or("unknown");

                        let status_str = match status {
                            "valid" => "✓".green(),
                            _ => "✗".red(),
                        };

                        println!(
                            "  {}. {} [{}] ({} action(s)) {}",
                            idx + 1,
                            name.cyan(),
                            obs_type.yellow(),
                            actions,
                            status_str
                        );
                    }
                }

                println!(
                    "\n{}: {}",
                    "Database Connectivity".cyan(),
                    validation_result["database_connectivity"]["status"]
                        .as_str()
                        .unwrap_or("unknown")
                        .bright_black()
                );
            }

            if is_valid {
                println!(
                    "\n{}",
                    "✓ Configuration is valid and ready for deployment".green().bold()
                );
            } else {
                println!("\n{}", "✗ Configuration has errors and cannot be deployed".red().bold());
            }
        },
    }

    Ok(())
}
