//! Identity, verification, and configuration commands.

use super::format::{short_id, signature_line, when};

use super::open;

use anyhow::Result;

use oxy_core::hash::ChangeHash;

use oxy_core::identity::Identity;

use oxy_core::repo::{self, IdentityScope};

use std::path::{Path, PathBuf};

pub fn create(name: Option<String>, email: Option<String>, local: bool) -> Result<i32> {

    let mut repo = open()?;

    let name = name.unwrap_or_else(|| repo.config.author_name.clone());

    let email = email.unwrap_or_else(|| repo.config.author_email.clone());

    let scope = if local { IdentityScope::Repo } else { IdentityScope::User };

    let (key, _) = repo.create_identity(&name, &email, scope)?;

    println!("Created identity {name} <{email}>");

    println!("KeyId: {key}");

    println!("Secret key stored under {}", repo::default_keys_dir().display());

    match scope {

        IdentityScope::User => println!("Recorded as your default author in {}", repo.user_config_path().display()),

        IdentityScope::Repo => println!("Recorded in this repository's .oxy/config only"),

    }

    if !repo.config.sign_changes {

        println!("Changes will carry this author; run `oxy config --user core.sign change` to sign each commit.");

    }

    Ok(0)

}

pub fn show() -> Result<i32> {

    let repo = open()?;

    let Some(key) = repo.config.author_key else {

        println!("No identity configured; run `oxy identity create`.");

        return Ok(0);

    };

    let id = repo.identity(&key)?;

    println!("{} <{}>", id.name, id.email);

    println!("KeyId:   {key}");

    println!("Created: {}", when(id.created));

    println!("Secret:  {}", if repo.secret_key()?.is_some() { "available" } else { "NOT FOUND in key directory" });

    println!("Signing: {}", if repo.config.sign_changes { "every change (core.sign = change)" } else { "at push via seals (core.sign = seal)" });

    Ok(0)

}

pub fn verify(change: Option<&str>) -> Result<i32> {

    let repo = open()?;

    let hashes: Vec<ChangeHash> = match change {

        Some(c) => vec![repo.resolve_change(c)?],

        None => repo.log()?.into_iter().filter(|e| !e.is_working_copy).map(|e| e.hash).collect(),

    };

    let mut bad = 0;

    for h in hashes {

        let c = repo.store().get_change(&h)?;

        let line = signature_line(&repo, &h)?;

        if line.starts_with("INVALID") {

            bad += 1;

        }

        println!("{} #{}  {line}", short_id(&c), h.short(12));

    }

    Ok(if bad > 0 { 1 } else { 0 })

}

pub fn config(key: &str, value: &str, user: bool) -> Result<i32> {

    if user {

        let path = repo::default_user_config();

        repo::Config::set_user(&path, key, value)?;

        println!("{key} = {value} (in {})", path.display());

    } else {

        let mut repo = open()?;

        repo.config.set(key, value)?;

        repo.save_config()?;

        println!("{key} = {value} (in this repository)");

    }

    Ok(0)

}

pub fn export(path: Option<PathBuf>) -> Result<i32> {

    let repo = open()?;

    let Some(key) = repo.config.author_key else {

        anyhow::bail!("no identity configured; run `oxy identity create`");

    };

    let id = repo.identity(&key)?;

    let path = path.unwrap_or_else(|| PathBuf::from(format!("{}.identity", key.short(16))));

    std::fs::write(&path, id.encode())?;

    println!("Wrote identity {} <{}> ({}) to {}", id.name, id.email, key.short(12), path.display());

    Ok(0)

}

pub fn policy_init() -> Result<i32> {

    let repo = open()?;

    let sp = repo.policy_init()?;

    println!("Created policy serial {} with root key {}; push to publish it.", sp.policy.serial, sp.policy.roots[0].short(12));

    Ok(0)

}

pub fn policy_show() -> Result<i32> {

    let repo = open()?;

    let Some((r, sp)) = repo.current_policy()? else {

        println!("No policy: this repository is unverified. Run `oxy policy init` to create one.");

        return Ok(0);

    };

    let p = &sp.policy;

    let name = |k: &oxy_core::hash::KeyId| p.identity(k).map(|i| format!("{} <{}>", i.name, i.email)).unwrap_or_else(|| "(unknown identity)".into());

    println!("policy #{} serial {} expires {}{}", r.short(12), p.serial, when(p.expires), if p.is_expired(oxy_core::objects::Hlc::now().wall_ms) { "  EXPIRED" } else { "" });

    println!("roots (threshold {}):", p.root_threshold);

    for k in &p.roots {

        println!("  {}  {}", k.short(12), name(k));

    }

    println!("rules:");

    for rule in &p.rules {

        println!("  {:12} threshold {} require {} conflicts {}", rule.pattern, rule.threshold, rule.require.name(), if rule.allow_conflicts { "allowed" } else { "refused" });

        for k in &rule.keys {

            println!("      {}  {}", k.short(12), name(k));

        }

    }

    if !p.revoked.is_empty() {

        println!("revoked:");

        for k in &p.revoked {

            println!("  {}  {}", k.short(12), name(k));

        }

    }

    Ok(0)

}

pub fn policy_grant(identity_file: &Path, pattern: Option<&str>) -> Result<i32> {

    let repo = open()?;

    let id = Identity::decode(&std::fs::read(identity_file)?)?;

    let key = id.hash();

    let sp = repo.policy_grant(id.clone(), pattern)?;

    println!("Granted {} <{}> ({}) on {}; policy serial {}. Push to publish.", id.name, id.email, key.short(12), pattern.unwrap_or("*"), sp.policy.serial);

    Ok(0)

}

pub fn policy_revoke(key: &str) -> Result<i32> {

    let repo = open()?;

    let Some((_, sp)) = repo.current_policy()? else {

        anyhow::bail!("this repository has no policy");

    };

    let matches: Vec<_> = sp.policy.identities.iter().map(|i| i.hash()).filter(|k| k.starts_with_hex(key)).collect();

    let full = match matches.len() {

        1 => matches[0],

        0 => anyhow::bail!("no key in the policy starts with {key:?}"),

        _ => anyhow::bail!("{key:?} is ambiguous"),

    };

    let sp = repo.policy_revoke(&full)?;

    println!("Revoked {}; policy serial {}. Push to publish.", full.short(12), sp.policy.serial);

    Ok(0)

}