rusty-commit 1.0.25

use anyhow::{Context, Result};
use colored::Colorize;
use dialoguer::{theme::ColorfulTheme, Select};
use std::process::Command;

use crate::cli::PrCommand;
use crate::config::Config;
use crate::git;
use crate::output::progress;
use crate::providers;

/// Unified output helper for PR commands.
#[allow(dead_code)]
struct PrOutput;

#[allow(dead_code)]
impl PrOutput {
    fn header(&self, text: &str) {
        println!("\n{}", text.green().bold());
    }

    fn subheader(&self, text: &str) {
        println!("{}", text.dimmed());
    }

    fn success(&self, message: &str) {
        println!("{}", format!("✓ {}", message).green());
    }

    fn warning(&self, message: &str) {
        println!("{}", message.yellow());
    }

    fn info(&self, message: &str) {
        println!("{}", message.cyan());
    }

    fn divider(&self) {
        println!("{}", "─".repeat(50).dimmed());
    }

    fn section(&self, title: &str) {
        self.divider();
        println!("{}", title.green().bold());
        self.divider();
    }
}

pub async fn execute(cmd: PrCommand) -> Result<()> {
    let config = Config::load()?;
    let repo_root = git::get_repo_root()?;

    match cmd.action {
        crate::cli::PrAction::Generate { base } => {
            generate_pr_description(&config, base.as_deref()).await
        }
        crate::cli::PrAction::Browse { base } => browse_pr_page(&repo_root, base.as_deref()),
    }
}

async fn generate_pr_description(config: &Config, base_branch: Option<&str>) -> Result<()> {
    let out = PrOutput;
    let current_branch = git::get_current_branch()?;
    let base = base_branch.unwrap_or("main");

    out.info(&format!(
        "Generating PR description for branch '{}' against '{}'...",
        current_branch, base
    ));

    // Get commits between branches
    let commits = git::get_commits_between(base, &current_branch)?;
    let diff = git::get_diff_between(base, &current_branch)?;

    if commits.is_empty() {
        out.warning("No commits found to generate PR description.");
        return Ok(());
    }

    let pb = progress::spinner("Generating PR description...");

    let provider = providers::create_provider(config)?;
    let description = provider
        .generate_pr_description(&commits, &diff, config)
        .await?;

    pb.finish_with_message("PR description generated!");

    // Display the description
    out.header("Generated PR Description");
    out.divider();
    println!("{}", description);
    out.divider();

    // Copy to clipboard option
    let choices = vec!["Copy to clipboard", "Show markdown", "Cancel"];
    let selection = Select::with_theme(&ColorfulTheme::default())
        .with_prompt("What would you like to do?")
        .items(&choices)
        .default(0)
        .interact()?;

    match selection {
        0 => {
            copy_to_clipboard(&description)?;
            println!("{}", "✅ PR description copied to clipboard!".green());
        }
        1 => {
            // Save to file for preview
            let preview_file = format!("PR_DESCRIPTION_{}.md", current_branch.replace('/', "_"));
            std::fs::write(&preview_file, &description)?;
            println!(
                "{}",
                format!("PR description saved to: {}", preview_file).green()
            );

            // Try to open in editor
            if let Ok(editor) = std::env::var("EDITOR") {
                if let Err(e) = Command::new(&editor).arg(&preview_file).status() {
                    eprintln!("Warning: Failed to open editor '{}': {}", editor, e);
                }
            }
        }
        _ => {
            println!("{}", "Cancelled.".yellow());
        }
    }

    Ok(())
}

fn browse_pr_page(_repo_root: &str, base_branch: Option<&str>) -> Result<()> {
    let current_branch = git::get_current_branch()?;
    let base = base_branch.unwrap_or("main");

    // Try to get GitHub remote URL
    let remote_url = git::get_remote_url(None)?;
    let pr_url = convert_to_pr_url(&remote_url, &current_branch, base)?;

    println!("{}", format!("Opening PR page: {}", pr_url).green());

    if let Err(e) = webbrowser::open(&pr_url) {
        eprintln!("Failed to open browser: {}", e);
        println!("Please open the following URL manually:");
        println!("{}", pr_url);
    }

    Ok(())
}

fn convert_to_pr_url(remote_url: &str, branch: &str, base: &str) -> Result<String> {
    // Convert SSH URL to HTTPS URL
    let url = if remote_url.contains("@") && remote_url.contains(":") {
        // SSH format: git@github.com:owner/repo.git
        let parts: Vec<&str> = remote_url.splitn(2, ':').collect();
        if parts.len() == 2 {
            let host_path = parts[1];
            let host_parts: Vec<&str> = parts[0].splitn(2, '@').collect();
            if host_parts.len() == 2 {
                let host = host_parts[1];
                let _path = host_path.trim_end_matches(".git");
                format!("https://{}/compare/{}...{}?expand=1", host, base, branch)
            } else {
                remote_url.to_string()
            }
        } else {
            remote_url.to_string()
        }
    } else if remote_url.contains("github.com") {
        // HTTPS format
        remote_url.replace(".git", "") + &format!("/compare/{}...{}?expand=1", base, branch)
    } else {
        // Non-GitHub repo
        format!("{}/compare/{}...{}", remote_url, base, branch)
    };

    Ok(url)
}

fn copy_to_clipboard(text: &str) -> Result<()> {
    #[cfg(target_os = "macos")]
    {
        use std::io::Write;
        use std::process::{Command, Stdio};

        let mut process = Command::new("pbcopy")
            .stdin(Stdio::piped())
            .spawn()
            .context("Failed to spawn pbcopy process")?;

        {
            let stdin = process
                .stdin
                .as_mut()
                .context("pbcopy stdin not available")?;
            stdin.write_all(text.as_bytes())?;
        }

        let status = process
            .wait()
            .context("Failed to wait for pbcopy process")?;
        if !status.success() {
            anyhow::bail!("pbcopy exited with error: {:?}", status);
        }
    }

    #[cfg(target_os = "linux")]
    {
        use std::io::Write;
        use std::process::{Command, Stdio};

        // Check if xclip is available, otherwise try xsel as fallback
        let use_xclip = !Command::new("which")
            .arg("xclip")
            .output()?
            .stdout
            .is_empty();

        let (cmd_name, args) = if use_xclip {
            ("xclip", vec!["-selection", "clipboard"])
        } else {
            ("xsel", vec!["--clipboard", "--input"])
        };

        let mut process = Command::new(cmd_name)
            .args(&args)
            .stdin(Stdio::piped())
            .spawn()
            .context(format!("Failed to spawn {} process", cmd_name))?;

        {
            let stdin = process
                .stdin
                .as_mut()
                .context(format!("{} stdin not available", cmd_name))?;
            stdin.write_all(text.as_bytes())?;
        }

        let status = process
            .wait()
            .context(format!("Failed to wait for {} process", cmd_name))?;
        if !status.success() {
            anyhow::bail!("{} exited with error: {:?}", cmd_name, status);
        }
    }

    #[cfg(target_os = "windows")]
    {
        let mut ctx = arboard::Clipboard::new()
            .map_err(|e| anyhow::anyhow!("Failed to access clipboard: {}", e))?;
        ctx.set_text(text.to_string())
            .map_err(|e| anyhow::anyhow!("Failed to set clipboard contents: {}", e))?;
    }

    Ok(())
}