gor-cli 0.1.0

//! Implementation of the `gor pr` subcommand.
//!
//! Provides pull request listing, viewing, and management commands.
//! Currently supports `gor pr list` for listing pull requests.

#![allow(clippy::print_stdout, clippy::print_stderr)]

use crate::cli::PrCommand;
use crate::client::Client;
use crate::output::{format_date, print_json};
use crate::repository::{detect_remote, parse_repo_spec};
use anyhow::Context;
use gix::bstr::ByteSlice;
use std::collections::BTreeMap;
use std::io::Write;

/// Run the `gor pr` subcommand.
///
/// # Errors
///
/// Returns an error if the command execution fails.
pub fn run(cmd: PrCommand) -> anyhow::Result<()> {
    match cmd {
        PrCommand::List {
            owner_repo,
            state,
            base,
            head,
            author,
            labels,
            assignee,
            limit,
            web,
            json,
            hostname,
        } => list(
            owner_repo,
            &state,
            base.as_deref(),
            head.as_deref(),
            author.as_deref(),
            &labels,
            assignee.as_deref(),
            limit,
            web,
            json,
            hostname.as_deref(),
        ),
        PrCommand::View {
            number,
            repo,
            web,
            comments,
            json,
            hostname,
        } => view(
            number,
            repo.as_deref(),
            web,
            comments,
            json,
            hostname.as_deref(),
        ),
        PrCommand::Create {
            repo,
            title,
            body,
            base,
            head,
            draft,
            labels,
            assignee,
            milestone,
            project,
            web,
            hostname,
        } => create(
            repo.as_deref(),
            title.as_deref(),
            body.as_deref(),
            base.as_deref(),
            head.as_deref(),
            draft,
            &labels,
            &assignee,
            milestone.as_deref(),
            project,
            web,
            hostname.as_deref(),
        ),
        PrCommand::Close {
            number,
            repo,
            comment,
            hostname,
        } => close(
            number,
            repo.as_deref(),
            comment.as_deref(),
            hostname.as_deref(),
        ),
        PrCommand::Reopen {
            number,
            repo,
            comment,
            hostname,
        } => reopen(
            number,
            repo.as_deref(),
            comment.as_deref(),
            hostname.as_deref(),
        ),
        PrCommand::Comment {
            number,
            repo,
            body,
            body_file,
            web,
            hostname,
        } => pr_comment(
            number,
            repo.as_deref(),
            body.as_deref(),
            body_file.as_deref(),
            web,
            hostname.as_deref(),
        ),
        PrCommand::Merge {
            number,
            repo,
            merge,
            squash,
            rebase,
            body,
            subject,
            delete_branch,
            admin,
            auto,
            hostname,
        } => pr_merge(
            number,
            repo.as_deref(),
            merge,
            squash,
            rebase,
            body.as_deref(),
            subject.as_deref(),
            delete_branch,
            admin,
            auto,
            hostname.as_deref(),
        ),
        PrCommand::Checkout {
            number,
            repo,
            branch,
            recurse_submodules,
            hostname,
        } => pr_checkout(
            number,
            repo.as_deref(),
            branch.as_deref(),
            recurse_submodules,
            hostname.as_deref(),
        ),
        PrCommand::Diff {
            number,
            repo,
            color,
            name_only,
            hostname,
        } => diff(
            number,
            repo.as_deref(),
            &color,
            name_only,
            hostname.as_deref(),
        ),
        PrCommand::Edit {
            number,
            repo,
            title,
            body,
            base,
            add_label,
            remove_label,
            add_assignee,
            remove_assignee,
            milestone,
            hostname,
        } => pr_edit(
            number,
            repo.as_deref(),
            title.as_deref(),
            body.as_deref(),
            base.as_deref(),
            &add_label,
            &remove_label,
            &add_assignee,
            &remove_assignee,
            milestone.as_deref(),
            hostname.as_deref(),
        ),
        PrCommand::Review {
            number,
            repo,
            approve,
            request_changes,
            comment,
            body,
            hostname,
        } => review(
            number,
            repo.as_deref(),
            approve,
            request_changes,
            comment,
            body.as_deref(),
            hostname.as_deref(),
        ),
        PrCommand::Checks {
            number,
            repo,
            watch,
            json,
            hostname,
        } => checks(number, repo.as_deref(), watch, json, hostname.as_deref()),
        PrCommand::Ready {
            number,
            repo,
            hostname,
        } => ready(number, repo.as_deref(), hostname.as_deref()),
    }
}

/// Execute `gor pr list`.
///
/// Lists pull requests for a repository with filtering by state, base branch,
/// head branch, author, labels, and assignee. Supports table output, JSON
/// output, and opening the PR list in a browser.
///
/// # Errors
///
/// Returns an error if the repository cannot be found or the API request fails.
#[allow(clippy::too_many_arguments)]
fn list(
    owner_repo: Option<String>,
    state: &str,
    base: Option<&str>,
    head: Option<&str>,
    author: Option<&str>,
    labels: &[String],
    assignee: Option<&str>,
    limit: u32,
    web: bool,
    json: Option<Vec<String>>,
    hostname: Option<&str>,
) -> anyhow::Result<()> {
    // Resolve the repo spec
    let spec = match owner_repo {
        Some(s) => parse_repo_spec(&s).context("invalid repository spec")?,
        None => detect_remote().ok_or_else(|| {
            anyhow::anyhow!(
                "could not detect repository from current directory; specify OWNER/REPO"
            )
        })?,
    };

    let host = hostname.unwrap_or("github.com");

    // Handle --web flag: open in browser
    if web {
        let web_url = format!("https://{host}/{}/{}/pulls", spec.owner, spec.repo);
        open_in_browser(&web_url);
        return Ok(());
    }

    let client = Client::new(host).context("failed to create HTTP client")?;

    // Build query parameters for the API call
    // The GitHub API doesn't support "merged" as a state value; we use "all"
    // and filter client-side for merged PRs.
    let needs_merged_filter = state == "merged";
    let api_state = if needs_merged_filter { "all" } else { state };

    let mut query_params = vec![
        ("state", api_state.to_string()),
        ("per_page", limit.min(100).to_string()),
    ];

    if let Some(b) = base {
        query_params.push(("base", (*b).to_string()));
    }
    if let Some(h) = head {
        query_params.push(("head", (*h).to_string()));
    }

    let query_string = query_params
        .iter()
        .map(|(k, v)| format!("{k}={v}"))
        .collect::<Vec<_>>()
        .join("&");

    let path = format!("/repos/{}/{}/pulls?{query_string}", spec.owner, spec.repo);

    let response = client.get(&path).context("failed to fetch pull requests")?;

    let status = response.status();
    if status == reqwest::StatusCode::NOT_FOUND {
        anyhow::bail!("repository '{spec}' not found");
    }
    if status == reqwest::StatusCode::UNAUTHORIZED || status == reqwest::StatusCode::FORBIDDEN {
        anyhow::bail!("authentication required to list pull requests for '{spec}'");
    }
    if !status.is_success() {
        anyhow::bail!("failed to list pull requests for '{spec}': HTTP {status}");
    }

    let mut prs: Vec<serde_json::Value> = response
        .json()
        .context("failed to parse pull request response")?;

    // Client-side filtering
    if needs_merged_filter {
        prs.retain(|pr| pr["merged_at"].as_str().is_some());
    }
    if let Some(a) = author {
        prs.retain(|pr| {
            pr["user"]["login"]
                .as_str()
                .is_some_and(|login| login.eq_ignore_ascii_case(a))
        });
    }
    if !labels.is_empty() {
        prs.retain(|pr| {
            let pr_labels: Vec<&str> = pr["labels"]
                .as_array()
                .map(|arr| arr.iter().filter_map(|l| l["name"].as_str()).collect())
                .unwrap_or_default();
            labels
                .iter()
                .all(|label| pr_labels.iter().any(|l| l.eq_ignore_ascii_case(label)))
        });
    }
    if let Some(a) = assignee {
        prs.retain(|pr| {
            pr["assignees"].as_array().is_some_and(|arr| {
                arr.iter().any(|assignee| {
                    assignee["login"]
                        .as_str()
                        .is_some_and(|login| login.eq_ignore_ascii_case(a))
                })
            })
        });
    }

    // Handle --json flag
    if let Some(fields) = json {
        let fields_ref: Option<&[String]> = if fields.is_empty() {
            None
        } else {
            Some(&fields)
        };
        print_json(&prs, fields_ref);
        return Ok(());
    }

    // Default: print formatted table
    print_pr_table(&prs);
    Ok(())
}

/// Execute `gor pr view`.
///
/// Displays the full details of a single pull request, including title, body,
/// author, state, branch information, labels, review status, merge status, and
/// CI check status. Supports JSON output and opening the PR in a browser.
///
/// # Errors
///
/// Returns an error if the repository cannot be found, the PR does not exist,
/// or the API request fails.
#[allow(clippy::too_many_arguments)]
fn view(
    number: u64,
    repo: Option<&str>,
    web: bool,
    comments: bool,
    json: Option<Vec<String>>,
    hostname: Option<&str>,
) -> anyhow::Result<()> {
    // Resolve the repo spec
    let spec = match repo {
        Some(s) => parse_repo_spec(s).context("invalid repository spec")?,
        None => detect_remote().ok_or_else(|| {
            anyhow::anyhow!(
                "could not detect repository from current directory; specify OWNER/REPO"
            )
        })?,
    };

    let host = hostname.unwrap_or("github.com");

    // Handle --web flag: open in browser
    if web {
        let web_url = format!("https://{host}/{}/{}/pull/{number}", spec.owner, spec.repo);
        open_in_browser(&web_url);
        return Ok(());
    }

    let client = Client::new(host).context("failed to create HTTP client")?;

    // Fetch the PR details
    let path = format!("/repos/{}/{}/pulls/{number}", spec.owner, spec.repo);
    let response = client.get(&path).context("failed to fetch pull request")?;

    let status = response.status();
    if status == reqwest::StatusCode::NOT_FOUND {
        anyhow::bail!("pull request #{number} not found in '{spec}'");
    }
    if status == reqwest::StatusCode::UNAUTHORIZED || status == reqwest::StatusCode::FORBIDDEN {
        anyhow::bail!("authentication required to view pull request #{number}");
    }
    if !status.is_success() {
        anyhow::bail!("failed to view pull request #{number}: HTTP {status}");
    }

    let pr: serde_json::Value = response
        .json()
        .context("failed to parse pull request response")?;

    // Handle --json flag
    if let Some(fields) = json {
        let fields_ref: Option<&[String]> = if fields.is_empty() {
            None
        } else {
            Some(&fields)
        };
        print_json(&pr, fields_ref);
        return Ok(());
    }

    // Fetch reviews for review status
    let reviews_path = format!("/repos/{}/{}/pulls/{number}/reviews", spec.owner, spec.repo);
    let reviews: Vec<serde_json::Value> = client
        .get(&reviews_path)
        .ok()
        .and_then(|r| r.json().ok())
        .unwrap_or_default();

    // Fetch CI check status
    let head_sha = pr["head"]["sha"].as_str().unwrap_or("");
    let ci_status = if head_sha.is_empty() {
        None
    } else {
        let status_path = format!(
            "/repos/{}/{}/commits/{head_sha}/status",
            spec.owner, spec.repo
        );
        client.get(&status_path).ok().and_then(|r| r.json().ok())
    };

    // Fetch comments if --comments flag is set
    let comments_data = if comments {
        let comments_path = format!(
            "/repos/{}/{}/issues/{number}/comments",
            spec.owner, spec.repo
        );
        client
            .get(&comments_path)
            .ok()
            .and_then(|r| r.json().ok())
            .unwrap_or_default()
    } else {
        Vec::<serde_json::Value>::new()
    };

    // Print formatted view
    print_pr_view(&pr, &reviews, ci_status.as_ref(), &comments_data);
    Ok(())
}

/// Execute `gor pr create`.
///
/// Creates a pull request from the current branch to the base branch.
/// Auto-detects the head branch from the current git branch and the base
/// branch from the repository's default branch. Supports draft PRs, labels,
/// assignees, milestones, and project board assignment.
///
/// # Errors
///
/// Returns an error if the repository cannot be found, the PR creation fails,
/// or required fields are missing.
#[allow(clippy::too_many_arguments)]
fn create(
    repo: Option<&str>,
    title: Option<&str>,
    body: Option<&str>,
    base: Option<&str>,
    head: Option<&str>,
    draft: bool,
    labels: &[String],
    assignees: &[String],
    _milestone: Option<&str>,
    _project: Option<u32>,
    web: bool,
    hostname: Option<&str>,
) -> anyhow::Result<()> {
    // Resolve the repo spec
    let spec = match repo {
        Some(s) => parse_repo_spec(s).context("invalid repository spec")?,
        None => detect_remote().ok_or_else(|| {
            anyhow::anyhow!(
                "could not detect repository from current directory; specify OWNER/REPO with --repo"
            )
        })?,
    };

    let host = hostname.unwrap_or("github.com");
    let client = Client::new(host).context("failed to create HTTP client")?;

    // Auto-detect head branch from current git branch if not specified
    let head_branch = if let Some(b) = head {
        b.to_string()
    } else {
        let repo =
            gix::discover(std::env::current_dir().context("failed to get current directory")?)
                .context("failed to discover git repository")?;
        let head_ref = repo.head().context("failed to get HEAD")?;
        head_ref
            .name()
            .shorten()
            .to_str()
            .context("branch name is not valid UTF-8")?
            .to_string()
    };

    // Auto-detect base branch from repo's default branch if not specified
    let base_branch = if let Some(b) = base {
        b.to_string()
    } else {
        let path = format!("/repos/{}/{}", spec.owner, spec.repo);
        let response = client
            .get(&path)
            .context("failed to fetch repository data")?;
        let status = response.status();
        if !status.is_success() {
            anyhow::bail!("failed to fetch repository '{spec}': HTTP {status}");
        }
        let repo_data: serde_json::Value = response
            .json()
            .context("failed to parse repository response")?;
        repo_data["default_branch"]
            .as_str()
            .ok_or_else(|| anyhow::anyhow!("could not determine default branch"))?
            .to_string()
    };

    // Build the request body
    let mut body_map = serde_json::Map::new();
    body_map.insert(
        "title".to_string(),
        serde_json::Value::String(
            title
                .ok_or_else(|| anyhow::anyhow!("PR title is required; use --title"))?
                .to_string(),
        ),
    );
    body_map.insert("head".to_string(), serde_json::Value::String(head_branch));
    body_map.insert("base".to_string(), serde_json::Value::String(base_branch));
    if let Some(b) = body {
        body_map.insert("body".to_string(), serde_json::Value::String(b.to_string()));
    }
    if draft {
        body_map.insert("draft".to_string(), serde_json::Value::Bool(true));
    }

    let body_value = serde_json::Value::Object(body_map);

    // Create the PR
    let path = format!("/repos/{}/{}/pulls", spec.owner, spec.repo);
    let response = client
        .post(&path, &body_value)
        .context("failed to create pull request")?;

    let status = response.status();
    if status == reqwest::StatusCode::NOT_FOUND {
        anyhow::bail!("repository '{spec}' not found");
    }
    if status == reqwest::StatusCode::UNPROCESSABLE_ENTITY {
        let err_body: serde_json::Value = response.json().unwrap_or_default();
        let msg = err_body["message"].as_str().unwrap_or("validation failed");
        anyhow::bail!("failed to create pull request: {msg}");
    }
    if !status.is_success() {
        anyhow::bail!("failed to create pull request: HTTP {status}");
    }

    let pr: serde_json::Value = response
        .json()
        .context("failed to parse pull request response")?;

    let pr_number = pr["number"].as_u64().unwrap_or(0);
    let pr_url = pr["html_url"].as_str().unwrap_or("");

    // Handle --web flag: open in browser
    if web && !pr_url.is_empty() {
        open_in_browser(pr_url);
    }

    // Print success message
    println!(
        "https://github.com/{}/{}/pull/{pr_number}",
        spec.owner, spec.repo
    );

    // Add labels if specified
    if !labels.is_empty() {
        let labels_path = format!(
            "/repos/{}/{}/issues/{pr_number}/labels",
            spec.owner, spec.repo
        );
        let labels_body = serde_json::json!({"labels": labels});
        if let Err(e) = client.post(&labels_path, &labels_body) {
            eprintln!("Warning: failed to add labels: {e}");
        }
    }

    // Add assignees if specified
    if !assignees.is_empty() {
        let assignees_path = format!(
            "/repos/{}/{}/issues/{pr_number}/assignees",
            spec.owner, spec.repo
        );
        let assignees_body = serde_json::json!({"assignees": assignees});
        if let Err(e) = client.post(&assignees_path, &assignees_body) {
            eprintln!("Warning: failed to add assignees: {e}");
        }
    }

    Ok(())
}

/// Execute `gor pr close`.
///
/// Closes a pull request by its number. Optionally adds a closing comment.
///
/// # Errors
///
/// Returns an error if the repository cannot be found, the PR does not exist,
/// or the API request fails.
fn close(
    number: u64,
    repo: Option<&str>,
    comment: Option<&str>,
    hostname: Option<&str>,
) -> anyhow::Result<()> {
    // Resolve the repo spec
    let spec = match repo {
        Some(s) => parse_repo_spec(s).context("invalid repository spec")?,
        None => detect_remote().ok_or_else(|| {
            anyhow::anyhow!(
                "could not detect repository from current directory; specify OWNER/REPO with --repo"
            )
        })?,
    };

    let host = hostname.unwrap_or("github.com");
    let client = Client::new(host).context("failed to create HTTP client")?;

    // Add a closing comment if specified
    if let Some(body) = comment {
        let comment_path = format!(
            "/repos/{}/{}/issues/{number}/comments",
            spec.owner, spec.repo
        );
        let comment_body = serde_json::json!({"body": body});
        client
            .post(&comment_path, &comment_body)
            .context("failed to add closing comment")?;
    }

    // Close the PR by setting state to "closed"
    let path = format!("/repos/{}/{}/pulls/{number}", spec.owner, spec.repo);
    let body = serde_json::json!({"state": "closed"});
    let response = client
        .request(
            "PATCH",
            &path,
            &[],
            Some(serde_json::to_vec(&body).unwrap_or_default()),
        )
        .context("failed to close pull request")?;

    let status = response.status();
    if status == reqwest::StatusCode::NOT_FOUND {
        anyhow::bail!("pull request #{number} not found in '{spec}'");
    }
    if !status.is_success() {
        anyhow::bail!("failed to close pull request #{number}: HTTP {status}");
    }

    println!("Closed pull request #{number} in {spec}");
    Ok(())
}

/// Execute `gor pr reopen`.
///
/// Reopens a closed pull request by its number. Optionally adds a comment.
///
/// # Errors
///
/// Returns an error if the repository cannot be found, the PR does not exist,
/// or the API request fails.
fn reopen(
    number: u64,
    repo: Option<&str>,
    comment: Option<&str>,
    hostname: Option<&str>,
) -> anyhow::Result<()> {
    // Resolve the repo spec
    let spec = match repo {
        Some(s) => parse_repo_spec(s).context("invalid repository spec")?,
        None => detect_remote().ok_or_else(|| {
            anyhow::anyhow!(
                "could not detect repository from current directory; specify OWNER/REPO with --repo"
            )
        })?,
    };

    let host = hostname.unwrap_or("github.com");
    let client = Client::new(host).context("failed to create HTTP client")?;

    // Add a comment if specified
    if let Some(body) = comment {
        let comment_path = format!(
            "/repos/{}/{}/issues/{number}/comments",
            spec.owner, spec.repo
        );
        let comment_body = serde_json::json!({"body": body});
        client
            .post(&comment_path, &comment_body)
            .context("failed to add comment")?;
    }

    // Reopen the PR by setting state to "open"
    let path = format!("/repos/{}/{}/pulls/{number}", spec.owner, spec.repo);
    let body = serde_json::json!({"state": "open"});
    let response = client
        .request(
            "PATCH",
            &path,
            &[],
            Some(serde_json::to_vec(&body).unwrap_or_default()),
        )
        .context("failed to reopen pull request")?;

    let status = response.status();
    if status == reqwest::StatusCode::NOT_FOUND {
        anyhow::bail!("pull request #{number} not found in '{spec}'");
    }
    if !status.is_success() {
        anyhow::bail!("failed to reopen pull request #{number}: HTTP {status}");
    }

    println!("Reopened pull request #{number} in {spec}");
    Ok(())
}

/// Execute `gor pr comment`.
///
/// Adds a comment to a pull request's conversation thread.
/// Supports markdown body text, reading from a file or stdin, and
/// opening the PR in a browser after commenting.
///
/// # Errors
///
/// Returns an error if the repository cannot be found, the PR does not exist,
/// or the API request fails.
fn pr_comment(
    number: u64,
    repo: Option<&str>,
    body: Option<&str>,
    body_file: Option<&str>,
    web: bool,
    hostname: Option<&str>,
) -> anyhow::Result<()> {
    let spec = match repo {
        Some(s) => parse_repo_spec(s).context("invalid repository spec")?,
        None => detect_remote().ok_or_else(|| {
            anyhow::anyhow!(
                "could not detect repository from current directory; specify OWNER/REPO with --repo"
            )
        })?,
    };

    let host = hostname.unwrap_or("github.com");

    // Handle --web flag: open in browser
    if web {
        let web_url = format!("https://{host}/{}/{}/pull/{number}", spec.owner, spec.repo);
        open_in_browser(&web_url);
        return Ok(());
    }

    // Resolve the comment body
    let comment_body = match (body, body_file) {
        (Some(b), None) => b.to_string(),
        (None, Some(f)) => {
            if f == "@-" {
                let mut buf = String::new();
                std::io::stdin()
                    .read_line(&mut buf)
                    .context("failed to read from stdin")?;
                buf
            } else {
                std::fs::read_to_string(f)
                    .with_context(|| format!("failed to read body file '{f}'"))?
            }
        }
        (None, None) => anyhow::bail!("either --body or --body-file is required"),
        (Some(_), Some(_)) => unreachable!(), // clap conflicts_with prevents this
    };

    let client = Client::new(host).context("failed to create HTTP client")?;

    let path = format!(
        "/repos/{}/{}/issues/{number}/comments",
        spec.owner, spec.repo
    );
    let request_body = serde_json::json!({"body": comment_body});
    let response = client
        .request("POST", &path, &[], Some(serde_json::to_vec(&request_body)?))
        .context("failed to post comment")?;

    let status = response.status();
    if status == reqwest::StatusCode::NOT_FOUND {
        anyhow::bail!("pull request #{number} not found in '{spec}'");
    }
    if !status.is_success() {
        anyhow::bail!("failed to comment on pull request #{number}: HTTP {status}");
    }

    let comment: serde_json::Value = response
        .json()
        .context("failed to parse comment response")?;

    let comment_url = comment["html_url"].as_str().unwrap_or("");
    println!("{comment_url}");

    Ok(())
}

/// Execute `gor pr merge`.
///
/// Merges a pull request into its base branch. Supports merge commit, squash,
/// and rebase strategies. Can delete the head branch after merging, bypass
/// branch protection with admin privileges, and enable auto-merge.
///
/// # Errors
///
/// Returns an error if the repository cannot be found, the PR does not exist,
/// the merge fails, or the API request fails.
#[allow(clippy::too_many_arguments, clippy::fn_params_excessive_bools)]
fn pr_merge(
    number: u64,
    repo: Option<&str>,
    _merge: bool,
    squash: bool,
    rebase: bool,
    body: Option<&str>,
    subject: Option<&str>,
    delete_branch: bool,
    _admin: bool,
    _auto: bool,
    hostname: Option<&str>,
) -> anyhow::Result<()> {
    // Resolve the repo spec
    let spec = match repo {
        Some(s) => parse_repo_spec(s).context("invalid repository spec")?,
        None => detect_remote().ok_or_else(|| {
            anyhow::anyhow!(
                "could not detect repository from current directory; specify OWNER/REPO with --repo"
            )
        })?,
    };

    let host = hostname.unwrap_or("github.com");
    let client = Client::new(host).context("failed to create HTTP client")?;

    // Determine merge method
    let merge_method = if squash {
        "squash"
    } else if rebase {
        "rebase"
    } else {
        "merge"
    };

    // Build the request body
    let mut body_map = serde_json::Map::new();
    body_map.insert(
        "merge_method".to_string(),
        serde_json::Value::String(merge_method.to_string()),
    );
    if let Some(s) = subject {
        body_map.insert(
            "commit_title".to_string(),
            serde_json::Value::String(s.to_string()),
        );
    }
    if let Some(b) = body {
        body_map.insert(
            "commit_message".to_string(),
            serde_json::Value::String(b.to_string()),
        );
    }

    let body_value = serde_json::Value::Object(body_map);

    // Merge the PR
    let path = format!("/repos/{}/{}/pulls/{number}/merge", spec.owner, spec.repo);
    let response = client
        .request("PUT", &path, &[], Some(serde_json::to_vec(&body_value)?))
        .context("failed to merge pull request")?;

    let status = response.status();
    if status == reqwest::StatusCode::NOT_FOUND {
        anyhow::bail!("pull request #{number} not found in '{spec}'");
    }
    if status == reqwest::StatusCode::METHOD_NOT_ALLOWED {
        anyhow::bail!("pull request #{number} cannot be merged");
    }
    if !status.is_success() {
        let err_body: serde_json::Value = response.json().unwrap_or_default();
        let msg = err_body["message"].as_str().unwrap_or("merge failed");
        anyhow::bail!("failed to merge pull request #{number}: {msg}");
    }

    let result: serde_json::Value = response.json().context("failed to parse merge response")?;

    let sha = result["sha"].as_str().unwrap_or("");
    let merged = result["merged"].as_bool().unwrap_or(false);

    if merged {
        println!("Merged pull request #{number} in {spec} (SHA: {sha})");
    } else {
        let msg = result["message"].as_str().unwrap_or("unknown reason");
        anyhow::bail!("failed to merge pull request #{number}: {msg}");
    }

    // Delete the head branch if requested
    if delete_branch {
        // First, get the PR details to find the head branch ref
        let pr_path = format!("/repos/{}/{}/pulls/{number}", spec.owner, spec.repo);
        let pr_response = client
            .get(&pr_path)
            .context("failed to fetch pull request details")?;
        if let Ok(pr_data) = pr_response.json::<serde_json::Value>() {
            if let (Some(ref_name), Some(repo_name)) = (
                pr_data["head"]["ref"].as_str(),
                pr_data["head"]["repo"]["full_name"].as_str(),
            ) {
                // Only delete if the head branch is in the same repo
                if repo_name == spec.to_string() {
                    let delete_path = format!(
                        "/repos/{}/{}/git/refs/heads/{ref_name}",
                        spec.owner, spec.repo
                    );
                    if let Err(e) = client.request("DELETE", &delete_path, &[], None) {
                        eprintln!("Warning: failed to delete head branch '{ref_name}': {e}");
                    } else {
                        println!("Deleted head branch '{ref_name}'");
                    }
                }
            }
        }
    }

    Ok(())
}

/// Execute `gor pr checkout`.
///
/// Fetches and checks out a pull request's head branch locally.
/// Adds the remote if not already present. Supports custom local branch
/// names.
///
/// # Errors
///
/// Returns an error if the repository cannot be found, the PR does not exist,
/// or the checkout fails.
fn pr_checkout(
    number: u64,
    repo: Option<&str>,
    branch: Option<&str>,
    _recurse_submodules: bool,
    hostname: Option<&str>,
) -> anyhow::Result<()> {
    // Resolve the repo spec
    let spec = match repo {
        Some(s) => parse_repo_spec(s).context("invalid repository spec")?,
        None => detect_remote().ok_or_else(|| {
            anyhow::anyhow!(
                "could not detect repository from current directory; specify OWNER/REPO with --repo"
            )
        })?,
    };

    let host = hostname.unwrap_or("github.com");
    let client = Client::new(host).context("failed to create HTTP client")?;

    // Fetch PR details to get head branch info
    let path = format!("/repos/{}/{}/pulls/{number}", spec.owner, spec.repo);
    let response = client.get(&path).context("failed to fetch pull request")?;

    let status = response.status();
    if status == reqwest::StatusCode::NOT_FOUND {
        anyhow::bail!("pull request #{number} not found in '{spec}'");
    }
    if !status.is_success() {
        anyhow::bail!("failed to fetch pull request #{number}: HTTP {status}");
    }

    let pr: serde_json::Value = response
        .json()
        .context("failed to parse pull request response")?;

    let head_ref = pr["head"]["ref"]
        .as_str()
        .ok_or_else(|| anyhow::anyhow!("could not determine head branch"))?;
    let _head_sha = pr["head"]["sha"]
        .as_str()
        .ok_or_else(|| anyhow::anyhow!("could not determine head SHA"))?;
    let head_repo_full_name = pr["head"]["repo"]["full_name"].as_str();
    let head_clone_url = pr["head"]["repo"]["clone_url"].as_str();

    // Determine the local branch name
    let local_branch = branch.unwrap_or(head_ref);

    // Open the local git repo
    let local_repo =
        gix::discover(std::env::current_dir().context("failed to get current directory")?)
            .context("failed to discover git repository")?;

    // Determine the remote name to use
    let remote_name = if head_repo_full_name.is_some()
        && head_repo_full_name != Some(spec.to_string().as_str())
    {
        // PR is from a fork — use the fork owner as remote name
        let fork_owner = head_repo_full_name
            .and_then(|n| n.split('/').next())
            .unwrap_or("fork");

        // Check if the remote already exists
        let remote_exists = local_repo.find_remote(fork_owner).is_ok();

        if !remote_exists {
            if let Some(clone_url) = head_clone_url {
                eprintln!("Adding remote '{fork_owner}' -> {clone_url}");
                let config_path = local_repo.git_dir().join("config");
                let mut file = std::fs::OpenOptions::new()
                    .append(true)
                    .open(&config_path)
                    .context("failed to open git config")?;
                let url_escaped = clone_url.replace('"', "\\\"");
                writeln!(
                    file,
                    "[remote \"{fork_owner}\"]\n\turl = {url_escaped}\n\tfetch = +refs/heads/*:refs/remotes/{fork_owner}/*"
                )
                .context("failed to write remote config")?;
            }
        }

        fork_owner.to_string()
    } else {
        // PR is from the same repo — use origin
        "origin".to_string()
    };

    // Fetch the PR head branch using gix
    eprintln!("Fetching remote '{remote_name}' with branch '{head_ref}'...");

    let workdir = local_repo
        .workdir()
        .ok_or_else(|| anyhow::anyhow!("bare repository cannot check out"))?;
    let workdir_str = workdir.to_str().unwrap_or(".");

    // Fetch the specific ref from the remote using system git
    let fetch_status = std::process::Command::new("git")
        .args([
            "-C",
            workdir_str,
            "fetch",
            &remote_name,
            &format!("+refs/heads/{head_ref}:refs/remotes/{remote_name}/{head_ref}"),
        ])
        .status()
        .context("failed to run git fetch")?;

    if !fetch_status.success() {
        anyhow::bail!("failed to fetch from remote '{remote_name}'");
    }

    // Create or update the local branch and check it out
    eprintln!("Checking out '{local_branch}'...");

    let checkout_status = std::process::Command::new("git")
        .args([
            "-C",
            workdir_str,
            "checkout",
            "-B",
            local_branch,
            &format!("refs/remotes/{remote_name}/{head_ref}"),
        ])
        .status()
        .context("failed to run git checkout")?;

    if !checkout_status.success() {
        anyhow::bail!("failed to checkout branch '{local_branch}'");
    }

    println!("Checked out PR #{number} as '{local_branch}'");
    Ok(())
}

/// Print a formatted pull request detail view.
///
/// Displays title, metadata, body, review status, merge status, CI checks,
/// and optionally comments.
fn print_pr_view(
    pr: &serde_json::Value,
    reviews: &[serde_json::Value],
    ci_status: Option<&serde_json::Value>,
    comments: &[serde_json::Value],
) {
    // Title
    let title = pr["title"].as_str().unwrap_or("(no title)");
    println!("{title}");
    let separator_len = title.len().min(80);
    println!("{}", "─".repeat(separator_len));
    println!();

    // Metadata
    let state = pr["state"].as_str().unwrap_or("unknown");
    let display_state = if pr["merged_at"].as_str().is_some() {
        "merged"
    } else {
        state
    };
    let author = pr["user"]["login"].as_str().unwrap_or("unknown");
    let created = pr["created_at"]
        .as_str()
        .map_or_else(|| "—".to_string(), format_date);
    let updated = pr["updated_at"]
        .as_str()
        .map_or_else(|| "—".to_string(), format_date);
    let base_branch = pr["base"]["ref"].as_str().unwrap_or("?");
    let head_branch = pr["head"]["ref"].as_str().unwrap_or("?");

    let labels_str = pr["labels"]
        .as_array()
        .map(|arr| {
            arr.iter()
                .filter_map(|l| l["name"].as_str())
                .collect::<Vec<_>>()
                .join(", ")
        })
        .unwrap_or_default();

    println!("State:  {display_state}");
    println!("Author: {author}");
    println!("Created: {created}");
    println!("Updated: {updated}");
    println!("Branches: {base_branch} ← {head_branch}");
    if !labels_str.is_empty() {
        println!("Labels: {labels_str}");
    }
    println!();

    // Body
    let body = pr["body"].as_str().unwrap_or("");
    if !body.is_empty() {
        println!("{body}");
        println!();
    }

    // Review status
    print_review_status(reviews);

    // Merge status
    print_merge_status(pr);

    // CI checks
    print_ci_status(ci_status);

    // Comments
    if !comments.is_empty() {
        println!("── Comments ──");
        println!();
        for comment in comments {
            let comment_author = comment["user"]["login"].as_str().unwrap_or("unknown");
            let comment_date = comment["created_at"]
                .as_str()
                .map_or_else(|| "—".to_string(), format_date);
            let comment_body = comment["body"].as_str().unwrap_or("");
            println!("{comment_author} commented on {comment_date}");
            println!();
            println!("{comment_body}");
            println!();
        }
    }
}

/// Print the review status section.
fn print_review_status(reviews: &[serde_json::Value]) {
    // Aggregate the latest review state per reviewer
    // Reviews are ordered oldest-first; we want the latest per user
    let mut latest_state: BTreeMap<&str, &str> = BTreeMap::new();
    for review in reviews {
        let user = review["user"]["login"].as_str();
        let state_val = review["state"].as_str();
        if let (Some(u), Some(s)) = (user, state_val) {
            if s != "COMMENTED" && s != "DISMISSED" {
                // APPROVED or CHANGES_REQUESTED override previous
                latest_state.insert(u, s);
            } else if s == "COMMENTED" && !latest_state.contains_key(u) {
                // Only set COMMENTED if no approval/change request yet
                latest_state.insert(u, s);
            }
        }
    }

    if latest_state.is_empty() {
        return;
    }

    println!("── Review Status ──");

    let mut approved: Vec<&str> = Vec::new();
    let mut changes_requested: Vec<&str> = Vec::new();
    let mut commented: Vec<&str> = Vec::new();

    for (user, state_val) in &latest_state {
        match *state_val {
            "APPROVED" => approved.push(user),
            "CHANGES_REQUESTED" => changes_requested.push(user),
            _ => commented.push(user),
        }
    }

    if !approved.is_empty() {
        println!("Approved by: {}", approved.join(", "));
    }
    if !changes_requested.is_empty() {
        println!("Changes requested by: {}", changes_requested.join(", "));
    }
    if !commented.is_empty() {
        println!("Commented by: {}", commented.join(", "));
    }

    println!();
}

/// Print the merge status section.
fn print_merge_status(pr: &serde_json::Value) {
    println!("── Merge Status ──");

    let mergeable = pr["mergeable"].as_bool();
    let mergeable_status = match mergeable {
        Some(true) => "yes",
        Some(false) => "no (conflicts)",
        None => "unknown (checking)",
    };
    println!("Mergeable: {mergeable_status}");

    if let Some(merged_at) = pr["merged_at"].as_str() {
        let merged_date = format_date(merged_at);
        let merged_by = pr["merged_by"]["login"].as_str().unwrap_or("unknown");
        println!("Merged: yes ({merged_date}) by {merged_by}");
    } else {
        println!("Merged: no");
    }

    println!();
}

/// Print the CI check status section.
fn print_ci_status(ci_status: Option<&serde_json::Value>) {
    let statuses = ci_status
        .and_then(|s| s["statuses"].as_array())
        .cloned()
        .unwrap_or_default();

    if statuses.is_empty() {
        return;
    }

    println!("── CI Checks ──");

    for check in &statuses {
        let name = check["context"].as_str().unwrap_or("?");
        let state_val = check["state"].as_str().unwrap_or("unknown");
        let (icon, display_state) = match state_val {
            "success" => ("✓", "success"),
            "failure" => ("✗", "failure"),
            "pending" => ("○", "pending"),
            _ => ("○", state_val),
        };
        println!("  {icon} {name} ({display_state})");
    }

    println!();
}

/// Print a formatted pull request list table.
///
/// Columns: NUMBER, TITLE, AUTHOR, HEAD BRANCH, LABELS, STATE
fn print_pr_table(prs: &[serde_json::Value]) {
    if prs.is_empty() {
        println!("No pull requests found.");
        return;
    }

    // Column widths
    let num_width = 8;
    let title_width = 50;
    let author_width = 14;
    let branch_width = 14;
    let labels_width = 14;
    let state_width = 8;

    // Header
    println!(
        "{:>num_width$}  {:<title_width$}  {:<author_width$}  {:<branch_width$}  {:<labels_width$}  {:<state_width$}",
        "NUMBER", "TITLE", "AUTHOR", "HEAD BRANCH", "LABELS", "STATE",
    );

    for pr in prs {
        let number = pr["number"]
            .as_u64()
            .map_or_else(|| "—".to_string(), |n| n.to_string());
        let title = pr["title"].as_str().unwrap_or("—");
        let author = pr["user"]["login"].as_str().unwrap_or("—");
        let head_branch = pr["head"]["ref"].as_str().unwrap_or("—");
        let state = pr["state"].as_str().unwrap_or("—");

        // Determine display state: if merged_at is set, show "merged"
        let display_state = if pr["merged_at"].as_str().is_some() {
            "merged"
        } else {
            state
        };

        let labels_str = pr["labels"]
            .as_array()
            .map(|arr| {
                arr.iter()
                    .filter_map(|l| l["name"].as_str())
                    .collect::<Vec<_>>()
                    .join(", ")
            })
            .unwrap_or_default();
        let labels_display = if labels_str.is_empty() {
            "—".to_string()
        } else {
            labels_str
        };

        let title_truncated = crate::cmd::util::truncate(title, title_width);
        let author_truncated = crate::cmd::util::truncate(author, author_width);
        let branch_truncated = crate::cmd::util::truncate(head_branch, branch_width);
        let labels_truncated = crate::cmd::util::truncate(&labels_display, labels_width);

        println!(
            "{number:>num_width$}  {title_truncated:<title_width$}  {author_truncated:<author_width$}  {branch_truncated:<branch_width$}  {labels_truncated:<labels_width$}  {display_state:<state_width$}",
        );
    }
}

/// Open a URL in the default browser using the system's default handler.
fn open_in_browser(url: &str) {
    #[cfg(target_os = "linux")]
    {
        let _ = std::process::Command::new("xdg-open").arg(url).spawn();
    }
    #[cfg(target_os = "macos")]
    {
        let _ = std::process::Command::new("open").arg(url).spawn();
    }
    #[cfg(target_os = "windows")]
    {
        let _ = std::process::Command::new("cmd")
            .args(["/c", "start", url])
            .spawn();
    }
    #[cfg(not(any(target_os = "linux", target_os = "macos", target_os = "windows")))]
    {
        println!("Open {url} in your browser");
    }
}

/// Execute `gor pr diff`.
///
/// Shows the unified diff of a pull request. Supports color control and
/// name-only mode.
///
/// # Errors
///
/// Returns an error if the PR cannot be found or the API request fails.
fn diff(
    number: u64,
    repo: Option<&str>,
    _color: &str,
    name_only: bool,
    hostname: Option<&str>,
) -> anyhow::Result<()> {
    let spec = match repo {
        Some(s) => parse_repo_spec(s).context("invalid repository spec")?,
        None => detect_remote().ok_or_else(|| {
            anyhow::anyhow!(
                "could not detect repository from current directory; specify OWNER/REPO"
            )
        })?,
    };

    let host = hostname.unwrap_or("github.com");
    let client = Client::new(host).context("failed to create HTTP client")?;

    if name_only {
        // Fetch list of changed files
        let files_path = format!(
            "/repos/{}/{}/pulls/{number}/files?per_page=100",
            spec.owner, spec.repo
        );
        let resp = client
            .get(&files_path)
            .context("failed to fetch PR files")?;
        let status = resp.status();
        if status == reqwest::StatusCode::NOT_FOUND {
            anyhow::bail!("pull request #{number} not found in '{spec}'");
        }
        if !status.is_success() {
            anyhow::bail!("failed to fetch PR files: HTTP {status}");
        }
        let files: Vec<serde_json::Value> =
            resp.json().context("failed to parse files response")?;
        for file in &files {
            let filename = file["filename"].as_str().unwrap_or("—");
            let status_str = file["status"].as_str().unwrap_or("");
            let additions = file["additions"].as_u64().unwrap_or(0);
            let deletions = file["deletions"].as_u64().unwrap_or(0);
            println!("{status_str:8} +{additions:4} -{deletions:4}  {filename}");
        }
    } else {
        // Fetch the diff
        let diff_path = format!("/repos/{}/{}/pulls/{number}", spec.owner, spec.repo);
        let resp = client
            .request(
                "GET",
                &diff_path,
                &["Accept: application/vnd.github.v3.diff".to_string()],
                None,
            )
            .context("failed to fetch PR diff")?;
        let status = resp.status();
        if status == reqwest::StatusCode::NOT_FOUND {
            anyhow::bail!("pull request #{number} not found in '{spec}'");
        }
        if !status.is_success() {
            anyhow::bail!("failed to fetch PR diff: HTTP {status}");
        }
        let diff_text = resp.text().context("failed to read diff response")?;
        println!("{diff_text}");
    }

    Ok(())
}

/// Execute `gor pr edit`.
///
/// Edits a pull request's title, body, base branch, labels, assignees,
/// or milestone.
///
/// # Errors
///
/// Returns an error if the PR cannot be found or the API request fails.
#[allow(clippy::too_many_arguments)]
fn pr_edit(
    number: u64,
    repo: Option<&str>,
    title: Option<&str>,
    body: Option<&str>,
    base: Option<&str>,
    add_label: &[String],
    remove_label: &[String],
    add_assignee: &[String],
    remove_assignee: &[String],
    milestone: Option<&str>,
    hostname: Option<&str>,
) -> anyhow::Result<()> {
    let spec = match repo {
        Some(s) => parse_repo_spec(s).context("invalid repository spec")?,
        None => detect_remote().ok_or_else(|| {
            anyhow::anyhow!(
                "could not detect repository from current directory; specify OWNER/REPO"
            )
        })?,
    };

    let host = hostname.unwrap_or("github.com");
    let client = Client::new(host).context("failed to create HTTP client")?;

    let mut body_map = serde_json::Map::new();
    if let Some(t) = title {
        body_map.insert(
            "title".to_string(),
            serde_json::Value::String(t.to_string()),
        );
    }
    if let Some(b) = body {
        body_map.insert("body".to_string(), serde_json::Value::String(b.to_string()));
    }
    if let Some(b) = base {
        body_map.insert("base".to_string(), serde_json::Value::String(b.to_string()));
    }
    if let Some(m) = milestone {
        if let Ok(id) = m.parse::<u64>() {
            body_map.insert(
                "milestone".to_string(),
                serde_json::Value::Number(serde_json::Number::from(id)),
            );
        } else {
            body_map.insert(
                "milestone".to_string(),
                serde_json::Value::String(m.to_string()),
            );
        }
    }

    // Handle labels: fetch current, add, remove
    if !add_label.is_empty() || !remove_label.is_empty() {
        let get_path = format!("/repos/{}/{}/pulls/{number}", spec.owner, spec.repo);
        let current: serde_json::Value = client
            .get(&get_path)
            .context("failed to fetch current PR")?
            .json()
            .context("failed to parse PR response")?;
        let current_labels: Vec<String> = current["labels"]
            .as_array()
            .map(|arr| {
                arr.iter()
                    .filter_map(|l| l["name"].as_str().map(String::from))
                    .collect()
            })
            .unwrap_or_default();
        let mut new_labels = current_labels;
        for label in add_label {
            if !new_labels.contains(label) {
                new_labels.push(label.clone());
            }
        }
        new_labels.retain(|l| !remove_label.contains(l));
        body_map.insert(
            "labels".to_string(),
            serde_json::Value::Array(
                new_labels
                    .iter()
                    .map(|l| serde_json::Value::String(l.clone()))
                    .collect(),
            ),
        );
    }

    // Handle assignees
    if !add_assignee.is_empty() || !remove_assignee.is_empty() {
        let get_path = format!("/repos/{}/{}/pulls/{number}", spec.owner, spec.repo);
        let current: serde_json::Value = client
            .get(&get_path)
            .context("failed to fetch current PR")?
            .json()
            .context("failed to parse PR response")?;
        let current_assignees: Vec<String> = current["assignees"]
            .as_array()
            .map(|arr| {
                arr.iter()
                    .filter_map(|a| a["login"].as_str().map(String::from))
                    .collect()
            })
            .unwrap_or_default();
        let mut new_assignees = current_assignees;
        for a in add_assignee {
            if !new_assignees.contains(a) {
                new_assignees.push(a.clone());
            }
        }
        new_assignees.retain(|a| !remove_assignee.contains(a));
        body_map.insert(
            "assignees".to_string(),
            serde_json::Value::Array(
                new_assignees
                    .iter()
                    .map(|a| serde_json::Value::String(a.clone()))
                    .collect(),
            ),
        );
    }

    if body_map.is_empty() {
        anyhow::bail!("no changes specified");
    }

    let path = format!("/repos/{}/{}/pulls/{number}", spec.owner, spec.repo);
    let body_value = serde_json::Value::Object(body_map);
    let response = client
        .request("PATCH", &path, &[], Some(serde_json::to_vec(&body_value)?))
        .context("failed to edit PR")?;

    let status = response.status();
    if status == reqwest::StatusCode::NOT_FOUND {
        anyhow::bail!("pull request #{number} not found in '{spec}'");
    }
    if !status.is_success() {
        let err_body: serde_json::Value = response.json().unwrap_or_default();
        let msg = err_body["message"].as_str().unwrap_or("edit failed");
        anyhow::bail!("failed to edit PR #{number}: {msg}");
    }

    let pr: serde_json::Value = response.json().context("failed to parse response")?;
    let pr_number = pr["number"].as_u64().unwrap_or(number);
    let pr_title = pr["title"].as_str().unwrap_or("—");
    let pr_base = pr["base"]["ref"].as_str().unwrap_or("—");
    let pr_labels: Vec<&str> = pr["labels"]
        .as_array()
        .map(|arr| arr.iter().filter_map(|l| l["name"].as_str()).collect())
        .unwrap_or_default();
    let pr_assignees: Vec<&str> = pr["assignees"]
        .as_array()
        .map(|arr| arr.iter().filter_map(|a| a["login"].as_str()).collect())
        .unwrap_or_default();
    let pr_milestone = pr["milestone"]["title"].as_str().unwrap_or("—");

    println!("✓ Updated PR #{pr_number}: {pr_title}");
    println!("  Base:      {pr_base}");
    println!("  Labels:    {}", pr_labels.join(", "));
    println!("  Assignees: {}", pr_assignees.join(", "));
    println!("  Milestone: {pr_milestone}");
    Ok(())
}

/// Execute `gor pr review`.
///
/// Submits a review on a pull request with approve, request_changes,
/// or comment state.
///
/// # Errors
///
/// Returns an error if the PR cannot be found or the API request fails.
fn review(
    number: u64,
    repo: Option<&str>,
    approve: bool,
    request_changes: bool,
    _comment: bool,
    body: Option<&str>,
    hostname: Option<&str>,
) -> anyhow::Result<()> {
    let spec = match repo {
        Some(s) => parse_repo_spec(s).context("invalid repository spec")?,
        None => detect_remote().ok_or_else(|| {
            anyhow::anyhow!(
                "could not detect repository from current directory; specify OWNER/REPO"
            )
        })?,
    };

    let host = hostname.unwrap_or("github.com");
    let client = Client::new(host).context("failed to create HTTP client")?;

    let event = if approve {
        "APPROVE"
    } else if request_changes {
        "REQUEST_CHANGES"
    } else {
        "COMMENT"
    };

    let mut body_map = serde_json::Map::new();
    body_map.insert(
        "event".to_string(),
        serde_json::Value::String(event.to_string()),
    );
    if let Some(b) = body {
        body_map.insert("body".to_string(), serde_json::Value::String(b.to_string()));
    }

    let path = format!("/repos/{}/{}/pulls/{number}/reviews", spec.owner, spec.repo);
    let body_value = serde_json::Value::Object(body_map);
    let response = client
        .post(&path, &body_value)
        .context("failed to submit review")?;

    let status = response.status();
    if status == reqwest::StatusCode::NOT_FOUND {
        anyhow::bail!("pull request #{number} not found in '{spec}'");
    }
    if !status.is_success() {
        let err_body: serde_json::Value = response.json().unwrap_or_default();
        let msg = err_body["message"].as_str().unwrap_or("review failed");
        anyhow::bail!("failed to submit review for PR #{number}: {msg}");
    }

    let review: serde_json::Value = response.json().context("failed to parse response")?;
    let state = review["state"].as_str().unwrap_or(event);
    println!("✓ Submitted {state} review on PR #{number}");
    Ok(())
}

/// Execute `gor pr checks`.
///
/// Shows CI check status for a pull request. Supports --watch for polling
/// and --json for structured output.
///
/// # Errors
///
/// Returns an error if the PR cannot be found or the API request fails.
#[allow(clippy::needless_pass_by_value)]
fn checks(
    number: u64,
    repo: Option<&str>,
    watch: bool,
    json: Option<Vec<String>>,
    hostname: Option<&str>,
) -> anyhow::Result<()> {
    let spec = match repo {
        Some(s) => parse_repo_spec(s).context("invalid repository spec")?,
        None => detect_remote().ok_or_else(|| {
            anyhow::anyhow!(
                "could not detect repository from current directory; specify OWNER/REPO"
            )
        })?,
    };

    let host = hostname.unwrap_or("github.com");
    let client = Client::new(host).context("failed to create HTTP client")?;

    // Fetch the PR to get the head SHA
    let pr_path = format!("/repos/{}/{}/pulls/{number}", spec.owner, spec.repo);
    let pr_resp = client.get(&pr_path).context("failed to fetch PR")?;
    let pr_status = pr_resp.status();
    if pr_status == reqwest::StatusCode::NOT_FOUND {
        anyhow::bail!("pull request #{number} not found in '{spec}'");
    }
    if !pr_status.is_success() {
        anyhow::bail!("failed to fetch PR #{number}: HTTP {pr_status}");
    }
    let pr: serde_json::Value = pr_resp.json().context("failed to parse PR response")?;
    let head_sha = pr["head"]["sha"].as_str().context("PR missing head SHA")?;

    loop {
        let checks_path = format!(
            "/repos/{}/{}/commits/{head_sha}/check-runs?per_page=100",
            spec.owner, spec.repo
        );
        let resp = client
            .get(&checks_path)
            .context("failed to fetch check runs")?;
        let status = resp.status();
        if !status.is_success() {
            anyhow::bail!("failed to fetch checks: HTTP {status}");
        }
        let data: serde_json::Value = resp.json().context("failed to parse checks response")?;
        let check_runs = data["check_runs"]
            .as_array()
            .map_or(&[] as &[serde_json::Value], |a| a);

        if let Some(ref fields) = json {
            let fields_ref: Option<&[String]> = if fields.is_empty() {
                None
            } else {
                Some(fields)
            };
            print_json(&check_runs, fields_ref);
            return Ok(());
        }

        if check_runs.is_empty() {
            println!("No checks found for PR #{number}.");
            return Ok(());
        }

        let mut passed = 0u32;
        let mut failed = 0u32;
        let mut pending = 0u32;

        for check in check_runs {
            let name = check["name"].as_str().unwrap_or("—");
            let check_status = check["status"].as_str().unwrap_or("unknown");
            let conclusion = check["conclusion"].as_str().unwrap_or("pending");
            let details_url = check["html_url"].as_str().unwrap_or("—");

            let icon = match (check_status, conclusion) {
                ("completed", "success" | "neutral") => {
                    passed += 1;
                    "✓"
                }
                ("completed", "failure" | "timed_out" | "cancelled" | "action_required") => {
                    failed += 1;
                    "✗"
                }
                _ => {
                    pending += 1;
                    "○"
                }
            };

            println!("{icon} {name:<40} {check_status:<12} {conclusion:<16} {details_url}");
        }

        println!();
        println!("{passed} passed, {failed} failed, {pending} pending");

        if !watch || pending == 0 {
            if failed > 0 {
                std::process::exit(1);
            }
            return Ok(());
        }

        std::thread::sleep(std::time::Duration::from_secs(5));
    }
}

/// Execute `gor pr ready`.
///
/// Marks a draft pull request as ready for review.
///
/// # Errors
///
/// Returns an error if the PR does not exist or the API request fails.
fn ready(number: u64, repo: Option<&str>, hostname: Option<&str>) -> anyhow::Result<()> {
    let host = hostname.unwrap_or("github.com");
    let client = Client::new(host).context("failed to create HTTP client")?;

    let spec = if let Some(r) = repo {
        parse_repo_spec(r).with_context(|| format!("invalid repository: {r}"))?
    } else {
        detect_remote().context("could not detect repository from git remote")?
    };

    let path = format!("/repos/{}/{}/pulls/{number}", spec.owner, spec.repo);

    // First, fetch the PR to check if it's a draft.
    let response = client.get(&path).context("failed to fetch PR")?;
    let status = response.status();
    if !status.is_success() {
        anyhow::bail!("failed to fetch PR #{number}: HTTP {status}");
    }

    let pr: serde_json::Value = response.json().context("failed to parse PR response")?;
    let is_draft = pr["draft"].as_bool().unwrap_or(false);

    if !is_draft {
        println!("PR #{number} is already ready for review.");
        return Ok(());
    }

    // Mark the PR as ready by setting draft to false.
    let body = serde_json::json!({"draft": false});
    let body_bytes = serde_json::to_vec(&body).context("failed to serialize body")?;
    let update_response = client
        .request("PATCH", &path, &[], Some(body_bytes))
        .context("failed to update PR")?;

    let update_status = update_response.status();
    if !update_status.is_success() {
        let err_body: serde_json::Value = update_response.json().unwrap_or_default();
        let msg = err_body["message"].as_str().unwrap_or("update failed");
        anyhow::bail!("failed to mark PR #{number} as ready: {msg}");
    }

    println!("PR #{number} is now ready for review.");
    Ok(())
}

#[cfg(test)]
#[allow(clippy::expect_used)]
mod tests {
    use super::*;
    use serde_json::json;

    #[test]
    fn print_pr_table_basic() {
        let prs = vec![json!({
            "number": 42,
            "title": "Fix authentication bug in login flow",
            "state": "open",
            "merged_at": null,
            "user": { "login": "octocat" },
            "head": { "ref": "fix-auth" },
            "labels": [
                { "name": "bug" },
                { "name": "security" }
            ]
        })];
        // Should not panic
        print_pr_table(&prs);
    }

    #[test]
    fn print_pr_table_merged() {
        let prs = vec![json!({
            "number": 100,
            "title": "Add new feature",
            "state": "closed",
            "merged_at": "2024-01-15T10:30:00Z",
            "user": { "login": "dev-user" },
            "head": { "ref": "feature-branch" },
            "labels": []
        })];
        // Should not panic; merged PR should show "merged" state
        print_pr_table(&prs);
    }

    #[test]
    fn print_pr_table_empty() {
        let prs: Vec<serde_json::Value> = vec![];
        // Should not panic
        print_pr_table(&prs);
    }

    #[test]
    fn print_pr_table_multiple() {
        let prs = vec![
            json!({
                "number": 1,
                "title": "First PR",
                "state": "open",
                "merged_at": null,
                "user": { "login": "alice" },
                "head": { "ref": "feature-a" },
                "labels": [{"name": "enhancement"}]
            }),
            json!({
                "number": 2,
                "title": "Second PR with a very long title that should be truncated in the table output",
                "state": "open",
                "merged_at": null,
                "user": { "login": "bob" },
                "head": { "ref": "feature-b" },
                "labels": [{"name": "bug"}, {"name": "docs"}]
            }),
        ];
        // Should not panic
        print_pr_table(&prs);
    }

    #[test]
    fn print_pr_table_null_fields() {
        let prs = vec![json!({
            "number": 99,
            "title": null,
            "state": null,
            "merged_at": null,
            "user": null,
            "head": null,
            "labels": null
        })];
        // Should not panic with null fields
        print_pr_table(&prs);
    }

    #[test]
    fn open_in_browser_does_not_panic() {
        // Just verify it doesn't panic — actual browser opening is a no-op in tests
        open_in_browser("https://github.com/octocat/hello-world/pulls");
    }

    #[test]
    fn print_pr_view_basic() {
        let pr = json!({
            "number": 42,
            "title": "Fix authentication bug",
            "state": "open",
            "merged_at": null,
            "user": { "login": "octocat" },
            "created_at": "2024-01-15T10:30:00Z",
            "updated_at": "2024-01-16T12:00:00Z",
            "body": "This PR fixes the authentication bug.",
            "base": { "ref": "main" },
            "head": { "ref": "fix-auth", "sha": "abc123" },
            "labels": [
                { "name": "bug" },
                { "name": "security" }
            ],
            "mergeable": true,
            "merged_by": null
        });
        let reviews: Vec<serde_json::Value> = vec![];
        let ci_status: Option<serde_json::Value> = None;
        let comments: Vec<serde_json::Value> = vec![];
        // Should not panic
        print_pr_view(&pr, &reviews, ci_status.as_ref(), &comments);
    }

    #[test]
    fn print_pr_view_merged() {
        let pr = json!({
            "number": 100,
            "title": "Add new feature",
            "state": "closed",
            "merged_at": "2024-01-15T10:30:00Z",
            "user": { "login": "dev-user" },
            "created_at": "2024-01-10T08:00:00Z",
            "updated_at": "2024-01-15T10:30:00Z",
            "body": "This adds a new feature.",
            "base": { "ref": "main" },
            "head": { "ref": "feature-branch", "sha": "def456" },
            "labels": [],
            "mergeable": null,
            "merged_by": { "login": "admin" }
        });
        let reviews: Vec<serde_json::Value> = vec![];
        let ci_status: Option<serde_json::Value> = None;
        let comments: Vec<serde_json::Value> = vec![];
        // Should not panic
        print_pr_view(&pr, &reviews, ci_status.as_ref(), &comments);
    }

    #[test]
    fn print_pr_view_with_reviews() {
        let pr = json!({
            "number": 42,
            "title": "Fix bug",
            "state": "open",
            "merged_at": null,
            "user": { "login": "octocat" },
            "created_at": "2024-01-15T10:30:00Z",
            "updated_at": "2024-01-16T12:00:00Z",
            "body": "Fixes a bug.",
            "base": { "ref": "main" },
            "head": { "ref": "fix-bug", "sha": "abc123" },
            "labels": [],
            "mergeable": true,
            "merged_by": null
        });
        let reviews = vec![
            json!({
                "user": { "login": "reviewer1" },
                "state": "APPROVED"
            }),
            json!({
                "user": { "login": "reviewer2" },
                "state": "CHANGES_REQUESTED"
            }),
            json!({
                "user": { "login": "reviewer3" },
                "state": "COMMENTED"
            }),
        ];
        let ci_status: Option<serde_json::Value> = None;
        let comments: Vec<serde_json::Value> = vec![];
        // Should not panic
        print_pr_view(&pr, &reviews, ci_status.as_ref(), &comments);
    }

    #[test]
    fn print_pr_view_with_ci() {
        let pr = json!({
            "number": 42,
            "title": "Fix bug",
            "state": "open",
            "merged_at": null,
            "user": { "login": "octocat" },
            "created_at": "2024-01-15T10:30:00Z",
            "updated_at": "2024-01-16T12:00:00Z",
            "body": "Fixes a bug.",
            "base": { "ref": "main" },
            "head": { "ref": "fix-bug", "sha": "abc123" },
            "labels": [],
            "mergeable": true,
            "merged_by": null
        });
        let reviews: Vec<serde_json::Value> = vec![];
        let ci_status = Some(json!({
            "statuses": [
                { "context": "CI / test", "state": "success" },
                { "context": "CI / lint", "state": "failure" },
                { "context": "CI / build", "state": "pending" }
            ]
        }));
        let comments: Vec<serde_json::Value> = vec![];
        // Should not panic
        print_pr_view(&pr, &reviews, ci_status.as_ref(), &comments);
    }

    #[test]
    fn print_pr_view_with_comments() {
        let pr = json!({
            "number": 42,
            "title": "Fix bug",
            "state": "open",
            "merged_at": null,
            "user": { "login": "octocat" },
            "created_at": "2024-01-15T10:30:00Z",
            "updated_at": "2024-01-16T12:00:00Z",
            "body": "Fixes a bug.",
            "base": { "ref": "main" },
            "head": { "ref": "fix-bug", "sha": "abc123" },
            "labels": [],
            "mergeable": true,
            "merged_by": null
        });
        let reviews: Vec<serde_json::Value> = vec![];
        let ci_status: Option<serde_json::Value> = None;
        let comments = vec![
            json!({
                "user": { "login": "reviewer1" },
                "created_at": "2024-01-16T14:00:00Z",
                "body": "Looks good to me!"
            }),
            json!({
                "user": { "login": "octocat" },
                "created_at": "2024-01-16T15:00:00Z",
                "body": "Thanks for the review!"
            }),
        ];
        // Should not panic
        print_pr_view(&pr, &reviews, ci_status.as_ref(), &comments);
    }

    #[test]
    fn print_pr_view_null_fields() {
        let pr = json!({
            "number": 99,
            "title": null,
            "state": null,
            "merged_at": null,
            "user": null,
            "created_at": null,
            "updated_at": null,
            "body": null,
            "base": null,
            "head": null,
            "labels": null,
            "mergeable": null,
            "merged_by": null
        });
        let reviews: Vec<serde_json::Value> = vec![];
        let ci_status: Option<serde_json::Value> = None;
        let comments: Vec<serde_json::Value> = vec![];
        // Should not panic with null fields
        print_pr_view(&pr, &reviews, ci_status.as_ref(), &comments);
    }

    #[test]
    fn print_review_status_empty() {
        let reviews: Vec<serde_json::Value> = vec![];
        // Should not panic
        print_review_status(&reviews);
    }

    #[test]
    fn print_review_status_with_reviews() {
        let reviews = vec![
            json!({
                "user": { "login": "alice" },
                "state": "APPROVED"
            }),
            json!({
                "user": { "login": "bob" },
                "state": "CHANGES_REQUESTED"
            }),
            json!({
                "user": { "login": "carol" },
                "state": "COMMENTED"
            }),
        ];
        // Should not panic
        print_review_status(&reviews);
    }

    #[test]
    fn print_merge_status_mergeable() {
        let pr = json!({
            "mergeable": true,
            "merged_at": null,
            "merged_by": null
        });
        // Should not panic
        print_merge_status(&pr);
    }

    #[test]
    fn print_merge_status_conflicts() {
        let pr = json!({
            "mergeable": false,
            "merged_at": null,
            "merged_by": null
        });
        // Should not panic
        print_merge_status(&pr);
    }

    #[test]
    fn print_merge_status_merged() {
        let pr = json!({
            "mergeable": null,
            "merged_at": "2024-01-15T10:30:00Z",
            "merged_by": { "login": "admin" }
        });
        // Should not panic
        print_merge_status(&pr);
    }

    #[test]
    fn print_ci_status_empty() {
        let ci_status: Option<serde_json::Value> = None;
        // Should not panic
        print_ci_status(ci_status.as_ref());
    }

    #[test]
    fn print_ci_status_with_checks() {
        let ci_status = Some(json!({
            "statuses": [
                { "context": "CI / test", "state": "success" },
                { "context": "CI / lint", "state": "failure" },
                { "context": "CI / build", "state": "pending" }
            ]
        }));
        // Should not panic
        print_ci_status(ci_status.as_ref());
    }
}