use anyhow::{Context as _, Result, bail};
use log::{info, warn};
use witryna::cli::{Cli, Command};
use witryna::config;
use witryna::logs::{self, DeploymentStatus};
use witryna::state::BuildEntry;
use witryna::{cleanup, pipeline, publish, server, state};

#[tokio::main]
async fn main() -> Result<()> {
    let cli: Cli = argh::from_env();
    let config_path = config::discover_config(cli.command.config())?;

    match cli.command {
        Command::Serve(_) => run_serve(config_path).await,
        Command::Validate(_) => run_validate(config_path).await,
        Command::Run(cmd) => Box::pin(run_run(config_path, cmd.site, cmd.verbose)).await,
        Command::Status(cmd) => run_status(config_path, cmd.site, cmd.json).await,
        Command::Switch(cmd) => run_switch(config_path, cmd.site, cmd.build).await,
        Command::Cleanup(cmd) => run_cleanup(config_path, cmd.site, cmd.keep).await,
    }
}

async fn run_serve(config_path: std::path::PathBuf) -> Result<()> {
    let config = config::Config::load(&config_path).await?;

    // Initialize logger with configured log level
    // RUST_LOG env var takes precedence if set
    witryna::logger::Logger::init(config.log_level_filter());

    info!(
        "loaded configuration: listen={} runtime={} base_dir={} log_dir={} log_level={} sites={}",
        config.listen_address,
        config.container_runtime,
        config.base_dir.display(),
        config.log_dir.display(),
        config.log_level,
        config.sites.len(),
    );

    for site in &config.sites {
        if site.webhook_token.is_empty() {
            warn!(
                "[{}] webhook authentication disabled (no token configured)",
                site.name,
            );
        }
        if let Some(interval) = site.poll_interval {
            info!(
                "[{}] configured site with polling: repo={} branch={} poll_interval_secs={}",
                site.name,
                site.repo_url,
                site.branch,
                interval.as_secs(),
            );
        } else {
            info!(
                "[{}] configured site (webhook-only): repo={} branch={}",
                site.name, site.repo_url, site.branch,
            );
        }
    }

    server::run(config, config_path).await
}

#[allow(clippy::print_stderr)] // CLI validation output goes to stderr
async fn run_validate(config_path: std::path::PathBuf) -> Result<()> {
    let config = config::Config::load(&config_path).await?;
    eprintln!("{}", format_validate_summary(&config, &config_path));
    Ok(())
}

#[allow(clippy::print_stderr)] // CLI output goes to stderr
async fn run_run(config_path: std::path::PathBuf, site_name: String, verbose: bool) -> Result<()> {
    let config = config::Config::load(&config_path).await?;

    let site = config
        .find_site(&site_name)
        .with_context(|| {
            format!(
                "site '{}' not found in {}",
                site_name,
                config_path.display()
            )
        })?
        .clone();

    // Initialize logger: DEBUG when verbose
    let level = if verbose {
        log::LevelFilter::Debug
    } else {
        log::LevelFilter::Info
    };
    witryna::logger::Logger::init(level);

    eprintln!(
        "Building site: {} (repo: {}, branch: {})",
        site_name, site.repo_url, site.branch
    );

    let git_timeout = config
        .git_timeout
        .unwrap_or(witryna::git::GIT_TIMEOUT_DEFAULT);

    let result = Box::pin(pipeline::run_build(
        &site_name,
        &site,
        &config.base_dir,
        &config.log_dir,
        &config.container_runtime,
        config.max_builds_to_keep,
        git_timeout,
        verbose,
    ))
    .await?;

    eprintln!(
        "Build succeeded in {} — {}",
        logs::format_duration(result.duration),
        result.build_dir.display(),
    );
    eprintln!("Log: {}", result.log_file.display());

    Ok(())
}

#[allow(clippy::print_stdout)] // CLI status output goes to stdout (pipeable)
async fn run_status(
    config_path: std::path::PathBuf,
    site_filter: Option<String>,
    json: bool,
) -> Result<()> {
    let config = config::Config::load(&config_path).await?;

    if let Some(name) = &site_filter
        && config.find_site(name).is_none()
    {
        bail!("site '{}' not found in {}", name, config_path.display());
    }

    let sites: Vec<&str> = match &site_filter {
        Some(name) => vec![name.as_str()],
        None => config.sites.iter().map(|s| s.name.as_str()).collect(),
    };

    let mut statuses: Vec<DeploymentStatus> = Vec::new();

    for site_name in &sites {
        let st = state::load_state(&config.base_dir, site_name).await;

        if st.builds.is_empty() {
            statuses.push(DeploymentStatus {
                site_name: (*site_name).to_owned(),
                timestamp: "-".to_owned(),
                git_commit: "-".to_owned(),
                duration: "-".to_owned(),
                status: "-".to_owned(),
                log: "(no builds)".to_owned(),
                current_build: String::new(),
            });
            continue;
        }

        // Single-site filter: show all builds. Overview: show only latest.
        let builds = if site_filter.is_some() {
            st.builds.iter().collect::<Vec<_>>()
        } else {
            st.builds.iter().take(1).collect::<Vec<_>>()
        };

        for entry in builds {
            statuses.push(build_entry_to_status(site_name, entry, &st.current));
        }
    }

    if json {
        #[allow(clippy::expect_used)] // DeploymentStatus serialization cannot fail
        let output = serde_json::to_string_pretty(&statuses)
            .expect("DeploymentStatus serialization cannot fail");
        println!("{output}");
    } else {
        print!("{}", format_status_table(&statuses));
    }

    Ok(())
}

#[allow(clippy::print_stderr)] // CLI output goes to stderr
async fn run_switch(
    config_path: std::path::PathBuf,
    site_name: String,
    build_timestamp: String,
) -> Result<()> {
    let config = config::Config::load(&config_path).await?;

    if config.find_site(&site_name).is_none() {
        bail!(
            "site '{}' not found in {}",
            site_name,
            config_path.display()
        );
    }

    let builds_dir = config.base_dir.join("builds").join(&site_name);

    if !builds_dir.exists() {
        bail!("no builds found for site '{site_name}'");
    }

    if !cleanup::looks_like_timestamp(&build_timestamp) {
        bail!("'{build_timestamp}' is not a valid build timestamp");
    }

    let build_dir = builds_dir.join(&build_timestamp);
    if !build_dir.is_dir() {
        let available = cleanup::list_build_timestamps(&builds_dir).await?;
        if available.is_empty() {
            bail!("no builds found for site '{site_name}'");
        }
        let mut sorted = available;
        sorted.sort_by(|a, b| b.cmp(a));
        bail!(
            "build '{}' not found for site '{}'\navailable builds:\n  {}",
            build_timestamp,
            site_name,
            sorted.join("\n  ")
        );
    }

    let current_link = builds_dir.join("current");
    publish::atomic_symlink_update(&build_dir, &current_link).await?;
    state::set_current(&config.base_dir, &site_name, &build_timestamp).await;

    eprintln!("switched {site_name} to build {build_timestamp}");
    Ok(())
}

#[allow(clippy::print_stderr)] // CLI output goes to stderr
async fn run_cleanup(
    config_path: std::path::PathBuf,
    site_filter: Option<String>,
    keep: Option<u32>,
) -> Result<()> {
    let config = config::Config::load(&config_path).await?;

    if let Some(name) = &site_filter
        && config.find_site(name).is_none()
    {
        bail!("site '{}' not found in {}", name, config_path.display());
    }

    if keep == Some(0) {
        bail!("--keep 0 would delete all builds; refusing");
    }

    let max_to_keep = keep.unwrap_or(config.max_builds_to_keep);

    if max_to_keep == 0 {
        eprintln!("cleanup disabled (max_builds_to_keep is 0; use --keep N to override)");
        return Ok(());
    }

    let sites: Vec<&str> = match &site_filter {
        Some(name) => vec![name.as_str()],
        None => config.sites.iter().map(|s| s.name.as_str()).collect(),
    };

    let mut total_builds: u32 = 0;
    let mut total_logs: u32 = 0;

    for site_name in &sites {
        let result =
            cleanup::cleanup_old_builds(&config.base_dir, &config.log_dir, site_name, max_to_keep)
                .await
                .with_context(|| format!("cleanup failed for site '{site_name}'"))?;

        if result.builds_removed > 0 || result.logs_removed > 0 {
            eprintln!(
                "{site_name}: removed {} build(s), {} log(s)",
                result.builds_removed, result.logs_removed
            );
        } else {
            eprintln!("{site_name}: nothing to clean");
        }

        total_builds += result.builds_removed;
        total_logs += result.logs_removed;
    }

    if sites.len() > 1 {
        eprintln!("total: {total_builds} build(s), {total_logs} log(s) removed");
    }

    Ok(())
}

/// Convert a `BuildEntry` to a `DeploymentStatus` for display.
///
/// For "building" entries, computes elapsed time from `started_at`.
fn build_entry_to_status(site_name: &str, entry: &BuildEntry, current: &str) -> DeploymentStatus {
    let duration = if entry.status == "building" {
        elapsed_since(&entry.started_at)
    } else {
        entry.duration.clone()
    };

    let git_commit = if entry.git_commit.is_empty() {
        "-".to_owned()
    } else {
        entry.git_commit.clone()
    };

    DeploymentStatus {
        site_name: site_name.to_owned(),
        timestamp: entry.timestamp.clone(),
        git_commit,
        duration,
        status: entry.status.clone(),
        log: entry.log.clone(),
        current_build: current.to_owned(),
    }
}

/// Compute human-readable elapsed time from an ISO 8601 timestamp.
fn elapsed_since(started_at: &str) -> String {
    let Some(start) = witryna::time::parse_rfc3339(started_at) else {
        return "-".to_owned();
    };
    let Ok(elapsed) = start.elapsed() else {
        return "-".to_owned();
    };
    logs::format_duration(elapsed)
}

fn format_status_table(statuses: &[DeploymentStatus]) -> String {
    use std::fmt::Write as _;

    let site_width = statuses
        .iter()
        .map(|s| s.site_name.len())
        .max()
        .unwrap_or(4)
        .max(4);

    let mut out = String::new();
    let _ = writeln!(
        out,
        "   {:<site_width$}  {:<11}  {:<7}  {:<8}  {:<24}  LOG",
        "SITE", "STATUS", "COMMIT", "DURATION", "TIMESTAMP"
    );

    for s in statuses {
        let marker = if !s.current_build.is_empty() && s.timestamp == s.current_build {
            "+"
        } else {
            " "
        };
        let _ = writeln!(
            out,
            "{marker}  {:<site_width$}  {:<11}  {:<7}  {:<8}  {:<24}  {}",
            s.site_name, s.status, s.git_commit, s.duration, s.timestamp, s.log
        );
    }

    out
}

fn format_validate_summary(config: &config::Config, path: &std::path::Path) -> String {
    use std::fmt::Write as _;
    let mut out = String::new();
    let _ = writeln!(out, "Configuration valid: {}", path.display());
    let _ = writeln!(out, "  Listen: {}", config.listen_address);
    let _ = writeln!(out, "  Runtime: {}", config.container_runtime);
    let _ = write!(out, "  Sites: {}", config.sites.len());
    for site in &config.sites {
        let _ = write!(
            out,
            "\n    - {} ({}, branch: {})",
            site.name, site.repo_url, site.branch
        );
    }
    out
}

#[cfg(test)]
#[allow(clippy::unwrap_used, clippy::indexing_slicing)]
mod tests {
    use super::*;
    use std::path::PathBuf;
    use witryna::config::{BuildOverrides, Config, SiteConfig};
    use witryna::logs::DeploymentStatus;

    fn test_config(sites: Vec<SiteConfig>) -> Config {
        Config {
            listen_address: "127.0.0.1:8080".to_owned(),
            container_runtime: "podman".to_owned(),
            base_dir: PathBuf::from("/var/lib/witryna"),
            log_dir: PathBuf::from("/var/log/witryna"),
            log_level: "info".to_owned(),
            max_builds_to_keep: 5,
            git_timeout: None,
            sites,
        }
    }

    fn test_site(name: &str, repo_url: &str, branch: &str) -> SiteConfig {
        SiteConfig {
            name: name.to_owned(),
            repo_url: repo_url.to_owned(),
            branch: branch.to_owned(),
            webhook_token: "token".to_owned(),
            webhook_token_file: None,
            build_overrides: BuildOverrides::default(),
            poll_interval: None,
            build_timeout: None,
            cache_dirs: None,
            post_deploy: None,
            env: None,
            container_memory: None,
            container_cpus: None,
            container_pids_limit: None,
            container_network: "none".to_owned(),
            git_depth: None,
            container_workdir: None,
            config_file: None,
        }
    }

    #[test]
    fn validate_summary_single_site() {
        let config = test_config(vec![test_site(
            "my-site",
            "https://github.com/user/my-site.git",
            "main",
        )]);
        let output = format_validate_summary(&config, &PathBuf::from("witryna.toml"));
        assert!(output.contains("Configuration valid: witryna.toml"));
        assert!(output.contains("Listen: 127.0.0.1:8080"));
        assert!(output.contains("Runtime: podman"));
        assert!(output.contains("Sites: 1"));
        assert!(output.contains("my-site (https://github.com/user/my-site.git, branch: main)"));
    }

    #[test]
    fn validate_summary_multiple_sites() {
        let config = test_config(vec![
            test_site("site-one", "https://github.com/user/site-one.git", "main"),
            test_site(
                "site-two",
                "https://github.com/user/site-two.git",
                "develop",
            ),
        ]);
        let output = format_validate_summary(&config, &PathBuf::from("/etc/witryna.toml"));
        assert!(output.contains("Sites: 2"));
        assert!(output.contains("site-one (https://github.com/user/site-one.git, branch: main)"));
        assert!(
            output.contains("site-two (https://github.com/user/site-two.git, branch: develop)")
        );
    }

    #[test]
    fn validate_summary_no_sites() {
        let config = test_config(vec![]);
        let output = format_validate_summary(&config, &PathBuf::from("witryna.toml"));
        assert!(output.contains("Sites: 0"));
        assert!(!output.contains("    -"));
    }

    #[test]
    fn validate_summary_runtime_shows_value() {
        let config = test_config(vec![]);
        let output = format_validate_summary(&config, &PathBuf::from("witryna.toml"));
        assert!(output.contains("Runtime: podman"));
    }

    // --- format_status_table tests ---

    fn test_deployment(
        site_name: &str,
        status: &str,
        commit: &str,
        duration: &str,
        timestamp: &str,
        log: &str,
    ) -> DeploymentStatus {
        DeploymentStatus {
            site_name: site_name.to_owned(),
            timestamp: timestamp.to_owned(),
            git_commit: commit.to_owned(),
            duration: duration.to_owned(),
            status: status.to_owned(),
            log: log.to_owned(),
            current_build: String::new(),
        }
    }

    #[test]
    fn format_status_table_single_site_success() {
        let statuses = vec![test_deployment(
            "my-site",
            "success",
            "abc123d",
            "45s",
            "20260126-143000-123456",
            "/var/log/witryna/my-site/20260126-143000-123456.log",
        )];
        let output = format_status_table(&statuses);
        assert!(output.contains("SITE"));
        assert!(output.contains("STATUS"));
        assert!(output.contains("my-site"));
        assert!(output.contains("success"));
        assert!(output.contains("abc123d"));
        assert!(output.contains("45s"));
    }

    #[test]
    fn format_status_table_no_builds() {
        let statuses = vec![test_deployment(
            "empty-site",
            "-",
            "-",
            "-",
            "-",
            "(no builds)",
        )];
        let output = format_status_table(&statuses);
        assert!(output.contains("empty-site"));
        assert!(output.contains("(no builds)"));
    }

    #[test]
    fn format_status_table_multiple_sites() {
        let statuses = vec![
            test_deployment(
                "site-one",
                "success",
                "abc123d",
                "45s",
                "20260126-143000-123456",
                "/logs/site-one/20260126-143000-123456.log",
            ),
            test_deployment(
                "site-two",
                "failed",
                "def456",
                "2m 0s",
                "20260126-160000-000000",
                "/logs/site-two/20260126-160000-000000.log",
            ),
        ];
        let output = format_status_table(&statuses);
        assert!(output.contains("site-one"));
        assert!(output.contains("site-two"));
        assert!(output.contains("success"));
        assert!(output.contains("failed"));
    }

    #[test]
    fn format_status_table_hook_failed() {
        let statuses = vec![test_deployment(
            "hook-site",
            "hook failed",
            "abc123d",
            "12s",
            "20260126-143000-123456",
            "/logs/hook-site/20260126-143000-123456.log",
        )];
        let output = format_status_table(&statuses);
        assert!(output.contains("hook failed"));
    }

    #[test]
    fn format_status_table_current_build_marker() {
        let mut ds = test_deployment(
            "my-site",
            "success",
            "abc123d",
            "45s",
            "20260126-143000-123456",
            "/logs/my-site/20260126-143000-123456.log",
        );
        ds.current_build = "20260126-143000-123456".to_owned();
        let output = format_status_table(&[ds]);

        // The matching row should start with "+"
        let data_line = output.lines().nth(1).unwrap();
        assert!(
            data_line.starts_with('+'),
            "row should start with '+', got: {data_line}"
        );
    }

    #[test]
    fn format_status_table_no_marker_when_no_current() {
        let ds = test_deployment(
            "my-site",
            "success",
            "abc123d",
            "45s",
            "20260126-143000-123456",
            "/logs/my-site/20260126-143000-123456.log",
        );
        let output = format_status_table(&[ds]);

        let data_line = output.lines().nth(1).unwrap();
        assert!(
            data_line.starts_with(' '),
            "row should start with space when no current_build, got: {data_line}"
        );
    }

    #[test]
    fn format_status_table_marker_only_on_matching_row() {
        let mut ds1 = test_deployment(
            "my-site",
            "success",
            "abc123d",
            "45s",
            "20260126-143000-123456",
            "/logs/1.log",
        );
        ds1.current_build = "20260126-143000-123456".to_owned();

        let mut ds2 = test_deployment(
            "my-site",
            "failed",
            "def4567",
            "30s",
            "20260126-150000-000000",
            "/logs/2.log",
        );
        ds2.current_build = "20260126-143000-123456".to_owned();

        let output = format_status_table(&[ds1, ds2]);
        let lines: Vec<&str> = output.lines().collect();

        assert!(
            lines[1].starts_with('+'),
            "matching row should have +: {}",
            lines[1]
        );
        assert!(
            lines[2].starts_with(' '),
            "non-matching row should have space: {}",
            lines[2]
        );
    }
}