//! Bookmarks, tags, conflicts, trust and pushes pages.

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

use super::{filters, lookup, lookup_role, Error, Page, RepoShell, Shell};

use crate::auth::{Access, Role, Viewer};

use crate::repos::view;

use crate::{db, Shared};

use askama::Template;

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

use serde::Deserialize;

#[derive(Template)]

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

pub struct BookmarksPage {

    shell: Shell,

    repo: RepoShell,

    bookmarks: Vec<view::BookmarkView>,

    /// Whether the viewer may delete bookmarks (write access).

    can_delete: bool,

    notice: Option<String>,

    error: Option<String>,

}

async fn bookmarks_page(

    app: &Shared,

    shell: Shell,

    repo: crate::repos::RepoName,

    row: db::repos::RepoRow,

    role: Role,

    notice: Option<String>,

    error: Option<String>,

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

    let default = row.default_bookmark.clone();

    let bookmarks =

        app.repos.read(&repo, move |r, cache| view::bookmarks(r, cache, &default)).await.map_err(|e| Error::from_repo(shell.clone(), e))?;

    let can_delete = shell.user.is_some() && role >= Role::Write;

    Ok(Page(BookmarksPage { shell, repo: RepoShell::new(app, &row, "bookmarks").with_role(role), bookmarks, can_delete, notice, error }))

}

pub async fn bookmarks(

    State(app): State<Shared>,

    viewer: Viewer,

    Path((owner, name)): Path<(String, String)>,

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

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

    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;

    bookmarks_page(&app, shell, repo, row, role, None, None).await

}

#[derive(Deserialize)]

pub struct DeleteBookmarkForm {

    #[serde(rename = "_csrf")]

    csrf_token: String,

    bookmark: String,

}

/// Delete a bookmark from the web (hub spec §6.4): what `oxy push --delete`

/// does, through the same checks. Never the default bookmark; refused under

/// a trust policy, which needs a signed attestation only a client can make.

pub async fn delete_bookmark(

    State(app): State<Shared>,

    viewer: Viewer,

    Path((owner, name)): Path<(String, String)>,

    Form(f): Form<DeleteBookmarkForm>,

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

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

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

    let (repo, row, role) = lookup_role(&app, &shell, &viewer, &owner, &name, Access::Write).await?;

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

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

    if bookmark == row.default_bookmark {

        let msg = format!("{bookmark} is the default bookmark; choose another default in Settings first.");

        return bookmarks_page(&app, shell, repo, row, role, None, Some(msg)).await;

    }

    let target = bookmark.clone();

    let outcome = app

        .repos

        .write(&repo, move |r, _| {

            let Some(state) = r.view()?.bookmarks.get(&target).copied() else {

                return Ok(Err(format!("There is no bookmark {target}.")));

            };

            let update = oxy_core::protocol::RefUpdate {

                name: target.clone(),

                old_state: state,

                new_state: oxy_core::hash::ObjectRef::ZERO,

                force: true,

                attestation: None,

            };

            let report = r.receive_push_report(Default::default(), vec![update], None, vec![])?;

            Ok(match report.results.first() {

                Some(res) if res.ok => Ok(state.to_hex()),

                Some(res) => Err(res.reason.clone()),

                None => Err("nothing happened".into()),

            })

        })

        .await

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

    let old_state = match outcome {

        Ok(s) => s,

        Err(msg) => return bookmarks_page(&app, shell, repo, row, role, None, Some(format!("Could not delete {bookmark}: {msg}"))).await,

    };

    let result = db::repos::PushOutcome {

        reference: bookmark.clone(),

        ok: true,

        reason: "deleted on the web".into(),

        old_state: old_state.clone(),

        new_state: oxy_core::hash::ObjectRef::ZERO.to_hex(),

        heads: 0,

        changes: 0,

    };

    db::repos::record_push(&app.db, row.id, Some((me.account.id, &me.account.username)), &[result]).await.ok();

    crate::hooks::emit(

        &app,

        &row,

        "push",

        &me.account.username,

        serde_json::json!({ "updates": [{ "reference": bookmark, "old_state": old_state, "new_state": oxy_core::hash::ObjectRef::ZERO.to_hex(), "heads": 0, "changes": 0, "deleted": true }], "via": "web" }),

    )

    .await;

    db::accounts::audit(&app.db, Some(&me.account), "bookmark.deleted", &format!("{owner}/{name}"), &bookmark).await.ok();

    bookmarks_page(

        &app,

        shell,

        repo,

        row,

        role,

        Some(format!("Deleted {bookmark}. Its changes stay while anything else reaches them.")),

        None,

    )

    .await

}

#[derive(Template)]

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

pub struct TagsPage {

    shell: Shell,

    repo: RepoShell,

    tags: Vec<view::TagView>,

}

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

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

    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;

    let tags = app.repos.read(&repo, |r, _| view::tags(r)).await.map_err(|e| Error::from_repo(shell.clone(), e))?;

    Ok(Page(TagsPage { shell, repo: RepoShell::new(&app, &row, "tags").with_role(role), tags }))

}

#[derive(Template)]

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

pub struct ConflictsPage {

    shell: Shell,

    repo: RepoShell,

    conflicts: Vec<view::ConflictView>,

}

pub async fn conflicts(

    State(app): State<Shared>,

    viewer: Viewer,

    Path((owner, name)): Path<(String, String)>,

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

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

    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;

    let conflicts = app.repos.read(&repo, view::conflicts).await.map_err(|e| Error::from_repo(shell.clone(), e))?;

    Ok(Page(ConflictsPage { shell, repo: RepoShell::new(&app, &row, "conflicts").with_role(role), conflicts }))

}

#[derive(Template)]

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

pub struct TrustPage {

    shell: Shell,

    repo: RepoShell,

    t: view::Trust,

}

pub async fn trust(

    State(app): State<Shared>,

    viewer: Viewer,

    Path((owner, name)): Path<(String, String)>,

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

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

    let (repo, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;

    let key = app.hub_key.key;

    let t = app.repos.read(&repo, move |r, cache| view::trust(r, cache, &key)).await.map_err(|e| Error::from_repo(shell.clone(), e))?;

    Ok(Page(TrustPage { shell, repo: RepoShell::new(&app, &row, "trust").with_role(role), t }))

}

#[derive(Template)]

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

pub struct PushesPage {

    shell: Shell,

    repo: RepoShell,

    pushes: Vec<db::repos::PushRow>,

}

pub async fn pushes(

    State(app): State<Shared>,

    viewer: Viewer,

    Path((owner, name)): Path<(String, String)>,

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

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

    let (_, row, role) = lookup(&app, &shell, &viewer, &owner, &name).await?;

    let pushes = db::repos::pushes(&app.db, row.id, 200).await.map_err(|e| Error::from_db(shell.clone(), e))?;

    Ok(Page(PushesPage { shell, repo: RepoShell::new(&app, &row, "pushes").with_role(role), pushes }))

}