//! Analytics commands

use clap::Subcommand;

use crate::{config::Config, error::Result, output};

#[derive(Subcommand)]
pub enum AnalyticsCommand {
    /// Show usage statistics
    Usage {
        /// Schema ID (or all if not specified)
        id: Option<String>,

        /// Time range (today, week, month, year)
        #[arg(short, long, default_value = "week")]
        range: String,
    },

    /// Generate analytics report
    Report {
        /// Report type (daily, weekly, monthly)
        #[arg(short, long, default_value = "weekly")]
        report_type: String,

        /// Output format (json, yaml, table)
        #[arg(short, long)]
        format: Option<String>,
    },

    /// Show top schemas by usage
    Top {
        /// Number of results
        #[arg(short, long, default_value = "10")]
        limit: usize,

        /// Metric (reads, writes, validations, errors)
        #[arg(short, long, default_value = "reads")]
        metric: String,
    },

    /// Show validation metrics
    Validation {
        /// Schema ID
        id: Option<String>,

        /// Time range
        #[arg(short, long, default_value = "week")]
        range: String,
    },

    /// Show performance metrics
    Performance {
        /// Percentile (50, 95, 99)
        #[arg(short, long, default_value = "95")]
        percentile: u8,
    },

    /// Show health score
    Health {
        /// Schema ID
        id: Option<String>,
    },
}

pub async fn execute(cmd: AnalyticsCommand, config: &Config, format: output::OutputFormat) -> Result<()> {
    match cmd {
        AnalyticsCommand::Usage { id, range } => {
            show_usage(config, id.as_deref(), &range, format).await
        }
        AnalyticsCommand::Report { report_type, format: report_format } => {
            generate_report(config, &report_type, report_format.as_deref(), format).await
        }
        AnalyticsCommand::Top { limit, metric } => {
            show_top_schemas(config, limit, &metric, format).await
        }
        AnalyticsCommand::Validation { id, range } => {
            show_validation_metrics(config, id.as_deref(), &range, format).await
        }
        AnalyticsCommand::Performance { percentile } => {
            show_performance_metrics(config, percentile, format).await
        }
        AnalyticsCommand::Health { id } => {
            show_health_score(config, id.as_deref(), format).await
        }
    }
}

async fn show_usage(_config: &Config, id: Option<&str>, range: &str, _format: output::OutputFormat) -> Result<()> {
    let scope = id.map(|s| format!("schema {}", s)).unwrap_or_else(|| "all schemas".to_string());
    output::print_info(&format!("Usage statistics for {} ({})", scope, range));

    output::print_table(
        vec!["Metric", "Count", "Avg/Day"],
        vec![
            vec!["Reads".to_string(), "12,547".to_string(), "1,792".to_string()],
            vec!["Writes".to_string(), "3,241".to_string(), "463".to_string()],
            vec!["Validations".to_string(), "45,892".to_string(), "6,556".to_string()],
            vec!["Compatibility checks".to_string(), "892".to_string(), "127".to_string()],
            vec!["Errors".to_string(), "34".to_string(), "5".to_string()],
        ],
    );

    Ok(())
}

async fn generate_report(
    _config: &Config,
    report_type: &str,
    _report_format: Option<&str>,
    _format: output::OutputFormat,
) -> Result<()> {
    output::print_info(&format!("Generating {} report...", report_type));

    // Mock report
    println!("\n{} Report", report_type.to_uppercase());
    println!("Period: 2024-01-08 to 2024-01-14");
    println!("\nKey Metrics:");
    println!("  Total operations: 156,234");
    println!("  Active schemas: 247");
    println!("  New schemas: 12");
    println!("  Deprecated schemas: 3");
    println!("  Avg response time: 15ms");
    println!("  Error rate: 0.02%");

    output::print_success("Report generated successfully");

    Ok(())
}

async fn show_top_schemas(_config: &Config, limit: usize, metric: &str, _format: output::OutputFormat) -> Result<()> {
    output::print_info(&format!("Top {} schemas by {}", limit, metric));

    output::print_table(
        vec!["Rank", "Schema", "Subject", metric],
        vec![
            vec!["1".to_string(), "abc-123".to_string(), "com.example.User".to_string(), "45,123".to_string()],
            vec!["2".to_string(), "def-456".to_string(), "com.example.Order".to_string(), "32,456".to_string()],
            vec!["3".to_string(), "ghi-789".to_string(), "com.example.Product".to_string(), "28,789".to_string()],
        ],
    );

    Ok(())
}

async fn show_validation_metrics(
    _config: &Config,
    id: Option<&str>,
    range: &str,
    _format: output::OutputFormat,
) -> Result<()> {
    let scope = id.map(|s| format!("schema {}", s)).unwrap_or_else(|| "all schemas".to_string());
    output::print_info(&format!("Validation metrics for {} ({})", scope, range));

    output::print_table(
        vec!["Metric", "Value"],
        vec![
            vec!["Total validations".to_string(), "45,892".to_string()],
            vec!["Successful".to_string(), "45,124 (98.3%)".to_string()],
            vec!["Failed".to_string(), "768 (1.7%)".to_string()],
            vec!["Avg duration".to_string(), "12.3ms".to_string()],
            vec!["p95 duration".to_string(), "28.5ms".to_string()],
            vec!["p99 duration".to_string(), "45.2ms".to_string()],
        ],
    );

    Ok(())
}

async fn show_performance_metrics(_config: &Config, percentile: u8, _format: output::OutputFormat) -> Result<()> {
    output::print_info(&format!("Performance metrics (p{})", percentile));

    output::print_table(
        vec!["Operation", "p50", "p95", "p99"],
        vec![
            vec!["Read".to_string(), "8ms".to_string(), "15ms".to_string(), "32ms".to_string()],
            vec!["Write".to_string(), "12ms".to_string(), "28ms".to_string(), "45ms".to_string()],
            vec!["Validate".to_string(), "15ms".to_string(), "35ms".to_string(), "68ms".to_string()],
            vec!["Compatibility".to_string(), "25ms".to_string(), "55ms".to_string(), "95ms".to_string()],
        ],
    );

    Ok(())
}

async fn show_health_score(_config: &Config, id: Option<&str>, _format: output::OutputFormat) -> Result<()> {
    let scope = id.map(|s| format!("schema {}", s)).unwrap_or_else(|| "registry".to_string());
    output::print_info(&format!("Health score for {}", scope));

    println!("\nOverall Health: 92/100 (Excellent)");
    println!("\nComponent Scores:");
    output::print_table(
        vec!["Component", "Score", "Status"],
        vec![
            vec!["Availability".to_string(), "98".to_string(), "✓ Healthy".to_string()],
            vec!["Performance".to_string(), "95".to_string(), "✓ Healthy".to_string()],
            vec!["Error Rate".to_string(), "88".to_string(), "⚠ Warning".to_string()],
            vec!["Validation Success".to_string(), "92".to_string(), "✓ Healthy".to_string()],
        ],
    );

    Ok(())
}
