//! Organisations and teams (hub spec §5.2).

use super::settings::{csrf, require};

use super::{Error, Page, Shell};

use crate::auth::{roles, Viewer};

use crate::db::accounts;

use crate::Shared;

use askama::Template;

use axum::extract::{Form, Path, State};

use axum::response::{IntoResponse, Redirect, Response};

use serde::Deserialize;

#[derive(Template)]

#[template(path = "org_new.html")]

pub struct OrgNewPage {

    shell: Shell,

    error: Option<String>,

}

pub async fn new_form(State(app): State<Shared>, viewer: Viewer) -> Result<Page<OrgNewPage>, Error> {

    let shell = Shell::new(&app, "/orgs/new", &viewer);

    require(&viewer, &shell)?;

    Ok(Page(OrgNewPage { shell, error: None }))

}

#[derive(Deserialize)]

pub struct OrgNewForm {

    #[serde(rename = "_csrf")]

    csrf_token: String,

    name: String,

    display_name: String,

}

pub async fn create(State(app): State<Shared>, viewer: Viewer, Form(f): Form<OrgNewForm>) -> Result<Response, Error> {

    let shell = Shell::new(&app, "/orgs/new", &viewer);

    let me = require(&viewer, &shell)?;

    csrf(&viewer, &f.csrf_token, &shell)?;

    let name = f.name.trim().to_string();

    if !crate::repos::names::valid_owner(&name) {

        return Ok(Page(OrgNewPage {

            shell,

            error: Some("An organisation name is letters, digits, dots, dashes and underscores.".into()),

        })

        .into_response());

    }

    let taken = accounts::account_by_name(&app.db, &name).await.map_err(|e| Error::from_db(shell.clone(), e))?.is_some()

        || accounts::org_by_name(&app.db, &name).await.map_err(|e| Error::from_db(shell.clone(), e))?.is_some()

        || accounts::username_retired(&app.db, &name).await.map_err(|e| Error::from_db(shell.clone(), e))?;

    if taken {

        return Ok(Page(OrgNewPage { shell, error: Some("That name is taken.".into()) }).into_response());

    }

    let org =

        accounts::create_org(&app.db, &name, f.display_name.trim(), me.account.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;

    accounts::audit(&app.db, Some(&me.account), "org.created", &org.name, "").await.ok();

    Ok(Redirect::to(&format!("/orgs/{}/settings", org.name)).into_response())

}

#[derive(Template)]

#[template(path = "org_settings.html")]

pub struct OrgSettingsPage {

    shell: Shell,

    org: accounts::Organisation,

    members: Vec<(accounts::Account, String)>,

    teams: Vec<(accounts::Team, Vec<accounts::Account>)>,

    hooks: Vec<super::webhooks::HookRow>,

    notice: Option<String>,

    error: Option<String>,

    /// Runners serving the organisation: (runner, what it serves, whether

    /// it is the organisation's own).

    runners: Vec<(crate::db::runners::Runner, String, bool)>,

    /// A registration token just made, shown once.

    runner_token: Option<String>,

    /// The organisation's AI assistants and prompt (#97).

    assistants: super::assistants::Panel,

}

async fn org_page(

    app: &Shared,

    shell: Shell,

    org: accounts::Organisation,

    notice: Option<String>,

    error: Option<String>,

) -> Result<Page<OrgSettingsPage>, Error> {

    let members = accounts::org_members(&app.db, org.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;

    let mut teams = Vec::new();

    for t in accounts::teams(&app.db, org.id).await.map_err(|e| Error::from_db(shell.clone(), e))? {

        let members = accounts::team_members(&app.db, t.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;

        teams.push((t, members));

    }

    let hooks = crate::db::hooks::hooks_for_org(&app.db, org.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;

    let hooks = super::webhooks::rows(app, hooks).await.map_err(|e| Error::from_db(shell.clone(), e))?;

    let mut runners = Vec::new();

    for r in crate::db::runners::serving_owner(&app.db, &org.name).await.map_err(|e| Error::from_db(shell.clone(), e))? {

        let own = r.scope_owner == org.name;

        let serves = match r.scope_repo_id {

            Some(id) => crate::db::repos::get_by_id(&app.db, id).await.ok().flatten().map(|p| p.slug()).unwrap_or_default(),

            None if own => "the organisation's repositories".into(),

            None => "the whole site".into(),

        };

        runners.push((r, serves, own));

    }

    let assistants = super::assistants::panel(app, &org_assistants(&org)).await.map_err(|e| Error::from_db(shell.clone(), e))?;

    Ok(Page(OrgSettingsPage { shell, org, members, teams, hooks, notice, error, runners, runner_token: None, assistants }))

}

async fn owned_org(app: &Shared, shell: &Shell, viewer: &Viewer, name: &str) -> Result<(accounts::Account, accounts::Organisation), Error> {

    let me = require(viewer, shell)?;

    let org = accounts::org_by_name(&app.db, name)

        .await

        .map_err(|e| Error::from_db(shell.clone(), e))?

        .ok_or_else(|| Error::not_found(shell.clone()))?;

    if !roles::is_org_owner(&app.db, &me.account, org.id).await.map_err(|e| Error::from_db(shell.clone(), e))? {

        return Err(Error::not_found(shell.clone()));

    }

    Ok((me.account, org))

}

pub async fn settings(State(app): State<Shared>, viewer: Viewer, Path(name): Path<String>) -> Result<Page<OrgSettingsPage>, Error> {

    let shell = Shell::new(&app, &format!("/orgs/{name}/settings"), &viewer);

    let (_, org) = owned_org(&app, &shell, &viewer, &name).await?;

    org_page(&app, shell, org, None, None).await

}

#[derive(Deserialize)]

pub struct OrgForm {

    #[serde(rename = "_csrf")]

    csrf_token: String,

    display_name: String,

    description: String,

    default_role: String,

}

pub async fn update(

    State(app): State<Shared>,

    viewer: Viewer,

    Path(name): Path<String>,

    Form(f): Form<OrgForm>,

) -> Result<Page<OrgSettingsPage>, Error> {

    let shell = Shell::new(&app, &format!("/orgs/{name}/settings"), &viewer);

    let (me, org) = owned_org(&app, &shell, &viewer, &name).await?;

    csrf(&viewer, &f.csrf_token, &shell)?;

    let role = if f.default_role == "none" || roles::Role::parse(&f.default_role).is_some() { f.default_role.as_str() } else { "read" };

    accounts::set_org(&app.db, org.id, f.display_name.trim(), f.description.trim(), role)

        .await

        .map_err(|e| Error::from_db(shell.clone(), e))?;

    accounts::audit(&app.db, Some(&me), "org.updated", &org.name, "").await.ok();

    let org = accounts::org_by_name(&app.db, &name).await.map_err(|e| Error::from_db(shell.clone(), e))?.unwrap_or(org);

    org_page(&app, shell, org, Some("Saved.".into()), None).await

}

#[derive(Deserialize)]

pub struct MemberForm {

    #[serde(rename = "_csrf")]

    csrf_token: String,

    username: String,

    #[serde(default)]

    role: String,

    #[serde(default)]

    remove: Option<String>,

}

pub async fn member(

    State(app): State<Shared>,

    viewer: Viewer,

    Path(name): Path<String>,

    Form(f): Form<MemberForm>,

) -> Result<Page<OrgSettingsPage>, Error> {

    let shell = Shell::new(&app, &format!("/orgs/{name}/settings"), &viewer);

    let (me, org) = owned_org(&app, &shell, &viewer, &name).await?;

    csrf(&viewer, &f.csrf_token, &shell)?;

    let Some(target) = accounts::account_by_name(&app.db, f.username.trim()).await.map_err(|e| Error::from_db(shell.clone(), e))? else {

        return org_page(&app, shell, org, None, Some("No such account.".into())).await;

    };

    if f.remove.is_some() {

        let owners = accounts::org_members(&app.db, org.id)

            .await

            .map_err(|e| Error::from_db(shell.clone(), e))?

            .iter()

            .filter(|(_, r)| r == "owner")

            .count();

        let is_owner =

            accounts::org_role(&app.db, org.id, target.id).await.map_err(|e| Error::from_db(shell.clone(), e))?.as_deref() == Some("owner");

        if is_owner && owners <= 1 {

            return org_page(&app, shell, org, None, Some("An organisation keeps at least one owner.".into())).await;

        }

        accounts::remove_org_member(&app.db, org.id, target.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;

        accounts::audit(&app.db, Some(&me), "org.member.removed", &org.name, &target.username).await.ok();

        return org_page(&app, shell, org, Some(format!("Removed {}.", target.username)), None).await;

    }

    let role = if f.role == "owner" { "owner" } else { "member" };

    accounts::set_org_member(&app.db, org.id, target.id, role).await.map_err(|e| Error::from_db(shell.clone(), e))?;

    accounts::audit(&app.db, Some(&me), "org.member.set", &org.name, &format!("{} {role}", target.username)).await.ok();

    org_page(&app, shell, org, Some(format!("{} is now {role}.", target.username)), None).await

}

#[derive(Deserialize)]

pub struct TeamForm {

    #[serde(rename = "_csrf")]

    csrf_token: String,

    team: String,

    #[serde(default)]

    username: String,

    #[serde(default)]

    action: String,

}

pub async fn team(

    State(app): State<Shared>,

    viewer: Viewer,

    Path(name): Path<String>,

    Form(f): Form<TeamForm>,

) -> Result<Page<OrgSettingsPage>, Error> {

    let shell = Shell::new(&app, &format!("/orgs/{name}/settings"), &viewer);

    let (me, org) = owned_org(&app, &shell, &viewer, &name).await?;

    csrf(&viewer, &f.csrf_token, &shell)?;

    let team_name = f.team.trim().to_string();

    if !crate::repos::names::valid_segment(&team_name) {

        return org_page(&app, shell, org, None, Some("A team name is letters, digits, dots, dashes and underscores.".into())).await;

    }

    let existing = accounts::team_by_name(&app.db, org.id, &team_name).await.map_err(|e| Error::from_db(shell.clone(), e))?;

    let notice = match f.action.as_str() {

        "create" => {

            if existing.is_some() {

                return org_page(&app, shell, org, None, Some("That team exists.".into())).await;

            }

            accounts::create_team(&app.db, org.id, &team_name).await.map_err(|e| Error::from_db(shell.clone(), e))?;

            format!("Team {team_name} created.")

        }

        "delete" => {

            if let Some(t) = existing {

                accounts::delete_team(&app.db, t.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;

            }

            format!("Team {team_name} deleted.")

        }

        "add" | "remove" => {

            let Some(t) = existing else { return org_page(&app, shell, org, None, Some("No such team.".into())).await };

            let Some(target) = accounts::account_by_name(&app.db, f.username.trim()).await.map_err(|e| Error::from_db(shell.clone(), e))?

            else {

                return org_page(&app, shell, org, None, Some("No such account.".into())).await;

            };

            if f.action == "add" {

                accounts::set_org_member(&app.db, org.id, target.id, "member").await.ok();

                accounts::add_team_member(&app.db, t.id, target.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;

                format!("{} added to {team_name}.", target.username)

            } else {

                accounts::remove_team_member(&app.db, t.id, target.id).await.map_err(|e| Error::from_db(shell.clone(), e))?;

                format!("{} removed from {team_name}.", target.username)

            }

        }

        _ => return Err(Error::bad(shell, "unknown team action")),

    };

    accounts::audit(&app.db, Some(&me), "org.team", &org.name, &format!("{} {team_name} {}", f.action, f.username.trim())).await.ok();

    org_page(&app, shell, org, Some(notice), None).await

}

/// `POST /orgs/{name}/settings/avatar`: upload or remove the organisation's logo.

pub async fn avatar(

    State(app): State<Shared>,

    viewer: Viewer,

    Path(name): Path<String>,

    multipart: axum::extract::Multipart,

) -> Result<Page<OrgSettingsPage>, Error> {

    let shell = Shell::new(&app, &format!("/orgs/{name}/settings"), &viewer);

    let (me, org) = owned_org(&app, &shell, &viewer, &name).await?;

    let upload = super::avatar::read_upload(multipart).await;

    csrf(&viewer, &upload.csrf, &shell)?;

    let result = super::avatar::apply(&app, "org", org.id, upload).await;

    if result.is_ok() {

        accounts::audit(&app.db, Some(&me), "org.picture", &org.name, "").await.ok();

    }

    let org = accounts::org_by_name(&app.db, &name).await.map_err(|e| Error::from_db(shell.clone(), e))?.unwrap_or(org);

    match result {

        Ok(m) => org_page(&app, shell, org, Some(m), None).await,

        Err(e) => org_page(&app, shell, org, None, Some(e)).await,

    }

}

/// `POST /orgs/{name}/settings/hooks`: webhooks that hear every repository of the organisation.

pub async fn hooks(

    State(app): State<Shared>,

    viewer: Viewer,

    Path(name): Path<String>,

    Form(f): Form<super::webhooks::HookForm>,

) -> Result<Page<OrgSettingsPage>, Error> {

    let shell = Shell::new(&app, &format!("/orgs/{name}/settings"), &viewer);

    let (_, org) = owned_org(&app, &shell, &viewer, &name).await?;

    csrf(&viewer, &f.csrf_token, &shell)?;

    let scope = super::webhooks::Scope::Org { id: org.id, name: org.name.clone() };

    match super::webhooks::apply(&app, &viewer, &scope, f).await.map_err(|e| Error::from_db(shell.clone(), e))? {

        Ok(notice) => org_page(&app, shell, org, Some(notice), None).await,

        Err(error) => org_page(&app, shell, org, None, Some(error)).await,

    }

}

pub async fn deliveries(

    State(app): State<Shared>,

    viewer: Viewer,

    Path((name, id)): Path<(String, i64)>,

) -> Result<Page<super::webhooks::DeliveriesPage>, Error> {

    let shell = Shell::new(&app, &format!("/orgs/{name}/settings/hooks/{id}/deliveries"), &viewer);

    let (_, org) = owned_org(&app, &shell, &viewer, &name).await?;

    let scope = super::webhooks::Scope::Org { id: org.id, name: org.name };

    super::webhooks::deliveries_page(&app, shell, &scope, None, id).await

}

pub async fn redeliver(

    State(app): State<Shared>,

    viewer: Viewer,

    Path((name, id, delivery)): Path<(String, i64, i64)>,

    Form(f): Form<super::session::CsrfForm>,

) -> Result<Page<super::webhooks::DeliveriesPage>, Error> {

    let shell = Shell::new(&app, &format!("/orgs/{name}/settings/hooks/{id}/deliveries"), &viewer);

    let (_, org) = owned_org(&app, &shell, &viewer, &name).await?;

    csrf(&viewer, &f.csrf, &shell)?;

    let scope = super::webhooks::Scope::Org { id: org.id, name: org.name };

    super::webhooks::redeliver(&app, &scope, id, delivery).await.map_err(|e| Error::from_db(shell.clone(), e))?;

    super::webhooks::deliveries_page(&app, shell, &scope, None, id).await

}

/// `POST /orgs/{name}/settings/runners/token`: a one-time registration

/// token for a runner that serves the organisation's repositories

/// (oxygenhub#41).

pub async fn runner_token(

    State(app): State<Shared>,

    viewer: Viewer,

    Path(name): Path<String>,

    Form(f): Form<super::session::CsrfForm>,

) -> Result<Page<OrgSettingsPage>, Error> {

    let shell = Shell::new(&app, &format!("/orgs/{name}/settings"), &viewer);

    let (me, org) = owned_org(&app, &shell, &viewer, &name).await?;

    csrf(&viewer, &f.csrf, &shell)?;

    let token = format!("flowreg_{}", crate::auth::random_hex(24));

    let scope = crate::db::runners::Scope { owner: org.name.clone(), repo_id: None };

    crate::db::runners::add_registration(&app.db, &blake3::hash(token.as_bytes()).to_hex(), &me.username, &scope)

        .await

        .map_err(|e| Error::from_db(shell.clone(), e))?;

    accounts::audit(&app.db, Some(&me), "flow.runner.token", &org.name, "registration token for the organisation").await.ok();

    let mut page = org_page(&app, shell, org, Some("Copy the token now; it is not shown again.".into()), None).await?;

    page.0.runner_token = Some(token);

    Ok(page)

}

/// `POST /orgs/{name}/settings/runners/{id}/remove`: remove a runner scoped

/// to the organisation or one of its repositories, when it runs nothing.

pub async fn runner_remove(

    State(app): State<Shared>,

    viewer: Viewer,

    Path((name, id)): Path<(String, i64)>,

    Form(f): Form<super::session::CsrfForm>,

) -> Result<Page<OrgSettingsPage>, Error> {

    let shell = Shell::new(&app, &format!("/orgs/{name}/settings"), &viewer);

    let (me, org) = owned_org(&app, &shell, &viewer, &name).await?;

    csrf(&viewer, &f.csrf, &shell)?;

    let e = |e| Error::from_db(shell.clone(), e);

    let Some(r) = crate::db::runners::get(&app.db, id).await.map_err(e)?.filter(|r| r.scope_owner == org.name) else {

        return Err(Error::not_found(shell));

    };

    if crate::db::runners::running(&app.db).await.map_err(e)?.iter().any(|(rid, n)| *rid == id && *n > 0) {

        return org_page(&app, shell, org, None, Some(format!("{} is running jobs: wait for them to finish.", r.name))).await;

    }

    crate::db::runners::remove(&app.db, id).await.map_err(e)?;

    accounts::audit(&app.db, Some(&me), "flow.runner.removed", &r.name, &org.name).await.ok();

    org_page(&app, shell, org, Some(format!("{} removed: its credential no longer works.", r.name)), None).await

}

fn org_assistants(org: &accounts::Organisation) -> super::assistants::Where {

    super::assistants::Where { scope: crate::assistants::Scope::Org(org.id), owner: org.name.clone(), label: org.name.clone() }

}

/// `POST /orgs/{name}/settings/assistants`: the organisation's assistants

/// and prompt (#97).

pub async fn assistants(

    State(app): State<Shared>,

    viewer: Viewer,

    Path(name): Path<String>,

    Form(f): Form<super::assistants::AssistantForm>,

) -> Result<Page<OrgSettingsPage>, Error> {

    let shell = Shell::new(&app, &format!("/orgs/{name}/settings"), &viewer);

    let (_, org) = owned_org(&app, &shell, &viewer, &name).await?;

    csrf(&viewer, &f.csrf_token, &shell)?;

    match super::assistants::apply(&app, &viewer, &org_assistants(&org), f).await.map_err(|e| Error::from_db(shell.clone(), e))? {

        Ok(notice) => org_page(&app, shell, org, Some(notice), None).await,

        Err(error) => org_page(&app, shell, org, None, Some(error)).await,

    }

}