//! `vcs access`: who can see a change or a path.
//!
//! `me` on a path makes it one of your own files (like .env): saved and
//! carried to your other workspaces, never landed. Paths for groups and
//! sharing changes are rules the host keeps.

use serde_json::json;

use crate::app::{App, Session};
use crate::ids;
use crate::out::{Fail, Out, Report};

pub fn run(app: &App, target: &str, who: Vec<String>, edit: bool) -> Out {
    let s = app.session()?;
    let change = app.save(&s)?;
    let _ = change;
    let is_change = ids::looks_like_change(target) && !app.db.changes_by_prefix(&s.project.id, target)?.is_empty();
    if is_change {
        return crate::remote::access_change(app, &s, target, who, edit);
    }
    let path = normalize(app, &s, target);
    let mut patterns = personal(app, &s.project.id)?;
    if who.is_empty() {
        let mut r = Report::new();
        let mine = patterns.iter().any(|p| p == &path) || crate::ws::Mine::new(&crate::ws::config(&s.root), &patterns).matches(&path);
        if mine {
            r.line("access", format!("{path}: only you (one of your own files)"));
            r.set("who", vec!["me"]);
        } else {
            let rules = crate::remote::path_rules(app, &s.project)?;
            match rules.iter().find(|(p, _)| crate::path_matches(&path, p)) {
                Some((p, who)) => {
                    r.line("access", format!("{path}: {} (rule on {p})", who.join(", ")));
                    r.set("who", who.clone());
                }
                None => {
                    r.line("access", format!("{path}: everyone with access to the project"));
                    r.set("who", vec!["team"]);
                }
            }
        }
        r.set("path", path);
        return Ok(r);
    }
    if who.len() == 1 && who[0] == "me" {
        if patterns.contains(&path) {
            let mut r = Report::new();
            r.line("access", format!("{path} is already only yours"));
            return Ok(r);
        }
        let before = patterns.clone();
        patterns.push(path.clone());
        set_personal(app, &s.project.id, &patterns)?;
        app.db.add_op(&s.ws.id, "access", &json!({ "target": path, "who": "me", "personal_before": before }))?;
        let mut r = Report::new();
        r.line("access", format!("{path} is now only yours: saved and carried to your other workspaces, never landed"));
        r.set("path", path).set("who", vec!["me"]);
        if crate::app::index_files(&crate::ws::Index::load(&s.root)).contains_key(&r.json["path"].as_str().unwrap_or("").to_string()) {
            r.next("main still has it; land a change that removes it from main if others shouldn't see it");
        }
        return Ok(r);
    }
    if !s.project.hosted() {
        return Err(Fail::new("bad_usage", "a project on this machine only has you; rules for other people need a hosted project")
            .state("nothing changed")
            .next("vcs publish <host/owner/name> to put it on a host"));
    }
    crate::remote::set_path_rule(app, &s, &path, who)
}

fn normalize(app: &App, s: &Session, target: &str) -> String {
    let abs = app.cwd.join(target);
    let rel = abs.strip_prefix(&s.root).map(|p| p.to_string_lossy().into_owned()).unwrap_or_else(|_| target.to_string());
    rel.trim_matches('/').to_string()
}

pub fn personal(app: &App, project: &str) -> anyhow::Result<Vec<String>> {
    let text: Option<String> = app
        .db
        .conn
        .query_row("SELECT patterns FROM personal WHERE project = ?1", [project], |r| r.get(0))
        .ok();
    Ok(text.and_then(|t| serde_json::from_str(&t).ok()).unwrap_or_default())
}

fn set_personal(app: &App, project: &str, patterns: &[String]) -> anyhow::Result<()> {
    app.db.conn.execute(
        "INSERT OR REPLACE INTO personal (project, patterns) VALUES (?1, ?2)",
        rusqlite::params![project, serde_json::to_string(patterns)?],
    )?;
    Ok(())
}

pub fn undo(app: &App, s: &Session, data: &serde_json::Value) -> Result<(), Fail> {
    if let Some(before) = data.get("personal_before") {
        let patterns: Vec<String> = serde_json::from_value(before.clone()).unwrap_or_default();
        set_personal(app, &s.project.id, &patterns)?;
        return Ok(());
    }
    if let Some(before) = data.get("rule_before") {
        let path = data.get("target").and_then(|v| v.as_str()).unwrap_or("");
        let who: Vec<String> = serde_json::from_value(before.clone()).unwrap_or_default();
        crate::remote::set_path_rule(app, s, path, if who.is_empty() { vec!["team".into()] } else { who })?;
        return Ok(());
    }
    Err(Fail::new("failed", "that access change can't be undone here"))
}