//! Command-coverage suite: at least one behavioural test for every
//! documented `:Nuwiki*` / `:Vimwiki*` command (see the COMMANDS section
//! of `doc/nuwiki.txt`).
//!
//! The user-facing commands funnel through `workspace/executeCommand`
//! into the Backend dispatcher, or — for follow/backlinks/rename — through
//! the standard LSP requests. The Backend itself owns a live `Client` and
//! can't be built in an integration test, so each case drives the *pure*
//! building-block the command relies on (the same functions the dispatcher
//! wraps). This file is organised to mirror the doc's command groups so a
//! reader can confirm every command has coverage.

use std::collections::HashMap;
use std::path::PathBuf;

use nuwiki_core::ast::{InlineNode, LinkKind, LinkTarget};
use nuwiki_core::date::DiaryDate;
use nuwiki_core::syntax::vimwiki::VimwikiSyntax;
use nuwiki_core::syntax::SyntaxPlugin;
use nuwiki_lsp::commands::{export_ops, ops, COMMANDS};
use nuwiki_lsp::config::WikiConfig;
use nuwiki_lsp::index::WorkspaceIndex;
use nuwiki_lsp::nav::find_inline_at;
use nuwiki_lsp::rename::{build_new_uri, rewrite_wikilink_target};
use nuwiki_lsp::wiki::{build_wikis, resolve_uri_to_wiki};
use nuwiki_lsp::{diary, export};
use tower_lsp::lsp_types::Url;

fn parse(src: &str) -> nuwiki_core::ast::DocumentNode {
    VimwikiSyntax::new().parse(src)
}

fn wiki_cfg(root: &str) -> WikiConfig {
    WikiConfig::from_root(PathBuf::from(root))
}

/// Build a workspace index rooted at `root` with the given `name -> source`
/// pages, mirroring the helper used by the other command suites.
fn build_index(root: &str, pages: &[(&str, &str)]) -> WorkspaceIndex {
    let mut idx = WorkspaceIndex::new(Some(PathBuf::from(root)));
    for (name, src) in pages {
        let uri = Url::from_file_path(format!("{root}/{name}.wiki")).unwrap();
        idx.upsert(uri, &parse(src));
    }
    idx
}

fn diary_index(root: &str, dates: &[&str]) -> WorkspaceIndex {
    let mut idx =
        WorkspaceIndex::new(Some(PathBuf::from(root))).with_diary_rel_path(Some("diary".into()));
    for d in dates {
        let uri = Url::from_file_path(format!("{root}/diary/{d}.wiki")).unwrap();
        idx.upsert(uri, &parse("= entry =\n"));
    }
    idx
}

// =====================================================================
// Group 1: Wiki / navigation
// =====================================================================

// :NuwikiIndex — open wiki N's index page.
#[test]
fn nuwiki_index_resolves_index_page() {
    let idx = build_index("/wiki", &[("index", "= Home =\n"), ("Other", "= O =\n")]);
    let page = idx.page_by_name("index").expect("index page indexed");
    assert!(page.uri.as_str().ends_with("/wiki/index.wiki"));
}

// :NuwikiTabIndex — same target as :NuwikiIndex, opened in a new tab.
// The tab-vs-current split is an editor concern; the resolved target is
// identical, and both verbs are advertised as executeCommands.
#[test]
fn nuwiki_tab_index_advertised_alongside_index() {
    assert!(COMMANDS.contains(&"nuwiki.wiki.openIndex"));
    assert!(COMMANDS.contains(&"nuwiki.wiki.tabOpenIndex"));
}

// :NuwikiUISelect — pick a wiki from the configured list.
#[test]
fn nuwiki_ui_select_lists_configured_wikis() {
    let cfgs = vec![wiki_cfg("/a/personal"), wiki_cfg("/b/work")];
    let wikis = build_wikis(&cfgs);
    assert_eq!(wikis.len(), 2);
    assert_eq!(wikis[0].config.name, "personal");
    assert_eq!(wikis[1].config.name, "work");

    // Selection by URI picks the wiki that actually owns the file.
    let uri = Url::from_file_path("/b/work/Page.wiki").unwrap();
    assert_eq!(resolve_uri_to_wiki(&wikis, &uri), Some(wikis[1].id));
}

// :NuwikiGoto {page} — open `{page}.wiki` by name.
#[test]
fn nuwiki_goto_opens_page_by_name() {
    let idx = build_index("/wiki", &[("index", "= H =\n"), ("Recipes", "= R =\n")]);
    let page = idx
        .page_by_name("Recipes")
        .expect("page resolvable by name");
    assert!(page.uri.as_str().ends_with("/wiki/Recipes.wiki"));
    assert!(idx.page_by_name("Missing").is_none());
}

// :NuwikiFollowLink — follow the link under the cursor.
#[test]
fn nuwiki_follow_link_resolves_target_under_cursor() {
    let idx = build_index(
        "/wiki",
        &[("Home", "see [[About]]\n"), ("About", "= A =\n")],
    );
    let doc = parse("see [[About]]\n");
    // Byte col 8 sits inside "[[About]]" (starts at byte 4).
    let node = find_inline_at(&doc, 0, 8).expect("wikilink under cursor");
    let InlineNode::WikiLink(w) = node else {
        panic!("expected a wikilink, got {node:?}");
    };
    let about = Url::from_file_path("/wiki/About.wiki").unwrap();
    assert_eq!(idx.resolve(&w.target, "Home"), Some(&about));
}

// :NuwikiBacklinks — every reference to the current page.
#[test]
fn nuwiki_backlinks_lists_referrers() {
    let idx = build_index(
        "/wiki",
        &[
            ("Home", "[[About]]\n"),
            ("Contact", "see [[About]] too\n"),
            ("About", "= A =\n"),
        ],
    );
    let back = idx.backlinks_for("About");
    assert_eq!(back.len(), 2);
    assert!(idx.backlinks_for("Home").is_empty());
}

// :NuwikiNextLink / :NuwikiPrevLink — jump to the next / previous wikilink.
// The jump itself is editor-side cursor movement; what the server provides
// is the ordered set of links on the page.
#[test]
fn nuwiki_next_prev_link_walk_links_in_document_order() {
    let doc = parse("intro [[First]] mid [[Second]] end [[Third]]\n");
    let links = ops::collect_wiki_links(&doc);
    let targets: Vec<&str> = links
        .iter()
        .filter_map(|l| l.target.path.as_deref())
        .collect();
    assert_eq!(targets, vec!["First", "Second", "Third"]);
}

// :NuwikiBaddLink — add the target of the link under the cursor to the
// buffer list. The editor :badds whatever URI the link resolves to.
#[test]
fn nuwiki_badd_link_resolves_target_uri() {
    let idx = build_index(
        "/wiki",
        &[("Home", "[[Notes/Todo]]\n"), ("Notes/Todo", "= T =\n")],
    );
    let target = LinkTarget {
        kind: LinkKind::Wiki,
        path: Some("Notes/Todo".into()),
        ..Default::default()
    };
    let expected = Url::from_file_path("/wiki/Notes/Todo.wiki").unwrap();
    assert_eq!(idx.resolve(&target, "Home"), Some(&expected));
}

// :NuwikiRenameFile — rename the page and rewrite every inbound link.
#[test]
fn nuwiki_rename_file_builds_uri_and_rewrites_links() {
    let new_uri = build_new_uri(&PathBuf::from("/wiki"), "New Name", ".wiki").unwrap();
    assert!(new_uri.as_str().ends_with("/wiki/New%20Name.wiki"));

    assert_eq!(
        rewrite_wikilink_target("[[Old Name|caption]]", "New Name"),
        Some("[[New Name|caption]]".to_string())
    );
}

// :NuwikiDeleteFile — delete the current page and its on-disk file.
#[test]
fn nuwiki_delete_file_emits_delete_workspace_edit() {
    use tower_lsp::lsp_types::{DocumentChangeOperation, DocumentChanges, ResourceOp};
    let uri = Url::parse("file:///wiki/Doomed.wiki").unwrap();
    let mut b = nuwiki_lsp::edits::WorkspaceEditBuilder::new();
    b.file_op(nuwiki_lsp::edits::op_delete(uri.clone()));
    let we = b.build();

    let DocumentChanges::Operations(ops) = we.document_changes.unwrap() else {
        panic!("expected resource operations");
    };
    assert!(matches!(
        &ops[0],
        DocumentChangeOperation::Op(ResourceOp::Delete(d)) if d.uri == uri
    ));
}

// =====================================================================
// Group 2: Diary
// =====================================================================

// :NuwikiMakeDiaryNote — open today's entry.
#[test]
fn nuwiki_make_diary_note_targets_todays_file() {
    let cfg = wiki_cfg("/wiki");
    let today = DiaryDate::from_ymd(2026, 5, 12).unwrap();
    let uri = diary::uri_for_date(&cfg, &today).unwrap();
    assert!(uri.as_str().ends_with("/diary/2026-05-12.wiki"));
}

// :NuwikiMakeYesterdayDiaryNote / :NuwikiMakeTomorrowDiaryNote — step the
// diary back / forward by one period at the daily cadence.
#[test]
fn nuwiki_yesterday_and_tomorrow_target_adjacent_files() {
    let cfg = wiki_cfg("/wiki");
    let yesterday = DiaryDate::from_ymd(2026, 5, 11).unwrap();
    let tomorrow = DiaryDate::from_ymd(2026, 5, 13).unwrap();
    assert!(diary::uri_for_date(&cfg, &yesterday)
        .unwrap()
        .as_str()
        .ends_with("/diary/2026-05-11.wiki"));
    assert!(diary::uri_for_date(&cfg, &tomorrow)
        .unwrap()
        .as_str()
        .ends_with("/diary/2026-05-13.wiki"));
}

// :NuwikiDiaryIndex — open the diary index page.
#[test]
fn nuwiki_diary_index_resolves_index_uri() {
    let cfg = wiki_cfg("/wiki");
    let uri = diary::index_uri(&cfg).unwrap();
    assert!(uri.as_str().ends_with("/diary/diary.wiki"));
}

// :NuwikiDiaryGenerateLinks — rebuild the diary index from disk entries.
#[test]
fn nuwiki_diary_generate_links_builds_grouped_body() {
    let idx = diary_index("/wiki", &["2026-05-10", "2026-05-12", "2026-04-30"]);
    let entries = diary::list_entries(&idx);
    let body = diary::build_index_body(&entries, "diary", "Diary");
    assert!(body.starts_with("= Diary ="));
    assert!(body.contains("2026-05-12"));
    assert!(body.contains("2026-05-10"));
    assert!(body.contains("2026-04-30"));
    // Newest entry appears before the older one within the same month.
    let p12 = body.find("2026-05-12").unwrap();
    let p10 = body.find("2026-05-10").unwrap();
    assert!(p12 < p10, "expected newest-first ordering");
}

// :NuwikiDiaryNextDay / :NuwikiDiaryPrevDay — walk indexed entries.
#[test]
fn nuwiki_diary_next_and_prev_day_walk_entries() {
    let idx = diary_index("/wiki", &["2026-05-10", "2026-05-12", "2026-05-15"]);
    let from = DiaryDate::from_ymd(2026, 5, 12).unwrap();
    assert_eq!(
        diary::next_entry(&idx, &from).unwrap().date.format(),
        "2026-05-15"
    );
    assert_eq!(
        diary::prev_entry(&idx, &from).unwrap().date.format(),
        "2026-05-10"
    );
}

// =====================================================================
// Group 3: Page generation
// =====================================================================

// :NuwikiTOC — generate / refresh the table of contents.
#[test]
fn nuwiki_toc_generates_nested_contents() {
    let src = "= Top =\n== Sub ==\ntext\n";
    let doc = parse(src);
    let uri = Url::from_file_path("/wiki/Page.wiki").unwrap();
    let edit = ops::toc_edit(src, &doc, &uri, true).expect("toc edit produced");
    assert!(edit.changes.is_some() || edit.document_changes.is_some());

    let toc = ops::build_toc_text(
        &[
            (1, "Top".into(), "top".into()),
            (2, "Sub".into(), "sub".into()),
        ],
        "Contents",
    );
    assert!(toc.contains("= Contents ="));
    assert!(toc.contains("- [[#top|Top]]"));
    assert!(toc.contains("  - [[#sub|Sub]]"));
}

// :NuwikiGenerateLinks — insert a flat list of every page in the wiki.
#[test]
fn nuwiki_generate_links_lists_all_pages_excluding_current() {
    let pages = vec!["About".to_string(), "Home".to_string(), "Notes".to_string()];
    let text = ops::build_links_text(&pages, "Links", Some("Home"));
    assert!(text.contains("= Links ="));
    assert!(text.contains("- [[About]]"));
    assert!(text.contains("- [[Notes]]"));
    assert!(!text.contains("[[Home]]"), "current page excluded");

    let src = "= Existing =\n";
    let doc = parse(src);
    let uri = Url::from_file_path("/wiki/Home.wiki").unwrap();
    assert!(ops::links_edit(src, &doc, &uri, "Home", &pages, true).is_some());
}

// :NuwikiCheckLinks — surface broken links across the workspace.
#[test]
fn nuwiki_check_links_distinguishes_broken_from_resolvable() {
    let idx = build_index(
        "/wiki",
        &[("Home", "[[About]] [[Ghost]]\n"), ("About", "= A =\n")],
    );
    let good = LinkTarget {
        kind: LinkKind::Wiki,
        path: Some("About".into()),
        ..Default::default()
    };
    let broken = LinkTarget {
        kind: LinkKind::Wiki,
        path: Some("Ghost".into()),
        ..Default::default()
    };
    assert!(idx.resolve(&good, "Home").is_some());
    assert!(
        idx.resolve(&broken, "Home").is_none(),
        "broken link unresolved"
    );
}

// =====================================================================
// Group 4: Tags
// =====================================================================

// :NuwikiSearchTags {tag} — every `:tag:` occurrence.
#[test]
fn nuwiki_search_tags_finds_occurrences() {
    let idx = build_index(
        "/wiki",
        &[("Home", ":alpha:beta:\n"), ("Work", ":alpha:\n")],
    );
    let hits = ops::tag_hits(&idx, "alpha");
    assert_eq!(hits.len(), 2);
    assert!(hits.iter().all(|h| h.name == "alpha"));
    assert!(ops::tag_hits(&idx, "nonexistent").is_empty());
}

// :NuwikiGenerateTagLinks [tag] — section linking every page with a tag.
#[test]
fn nuwiki_generate_tag_links_builds_section() {
    let idx = build_index(
        "/wiki",
        &[
            ("Home", ":alpha:\n"),
            ("Work", ":alpha:\n"),
            ("Misc", ":beta:\n"),
        ],
    );
    let by_tag = ops::tag_pages_snapshot(&idx);

    let single = ops::build_tag_links_text(&by_tag, Some("alpha")).unwrap();
    assert!(single.starts_with("= Tag: alpha ="));
    assert!(single.contains("- [[Home]]"));
    assert!(single.contains("- [[Work]]"));

    // No-arg variant emits a section per tag.
    let all = ops::build_tag_links_text(&by_tag, None).unwrap();
    assert!(all.starts_with("= Tags ="));
    assert!(all.contains("== alpha =="));
    assert!(all.contains("== beta =="));

    let src = "= Home =\n";
    let doc = parse(src);
    let uri = Url::from_file_path("/wiki/Home.wiki").unwrap();
    assert!(ops::tag_links_edit(src, &doc, &uri, Some("alpha"), &by_tag, true).is_some());
}

// :NuwikiRebuildTags — force a full workspace re-index. A rebuild must
// reflect the current on-disk tags, dropping stale ones.
#[test]
fn nuwiki_rebuild_tags_reflects_current_state() {
    let mut idx = WorkspaceIndex::new(Some(PathBuf::from("/wiki")));
    let uri = Url::from_file_path("/wiki/Home.wiki").unwrap();
    idx.upsert(uri.clone(), &parse(":old:\n"));
    assert_eq!(idx.tags_for("old").len(), 1);

    // Re-index after the page changed on disk.
    idx.upsert(uri, &parse(":new:\n"));
    assert!(idx.tags_for("old").is_empty(), "stale tag dropped");
    assert_eq!(idx.tags_for("new").len(), 1);
}

// =====================================================================
// Group 5: HTML export
// =====================================================================

// :Nuwiki2HTML — render the current page to HTML.
#[test]
fn nuwiki_2html_renders_page() {
    let cfg = wiki_cfg("/wiki");
    let doc = parse("%title My Page\n= One =\nbody text\n");
    let html = export::render_page_html(
        &doc,
        Some("<title>{{title}}</title><main>{{content}}</main>".into()),
        "Home",
        DiaryDate::from_ymd(2026, 5, 12).unwrap(),
        &cfg.html,
        Some(".wiki"),
        HashMap::new(),
    )
    .unwrap();
    assert!(html.contains("<title>My Page</title>"));
    assert!(html.contains("body text"));
}

// :Nuwiki2HTMLBrowse — render then open in the browser. The render output
// is identical to :Nuwiki2HTML; the browse step is an editor-side open.
#[test]
fn nuwiki_2html_browse_shares_render_and_is_advertised() {
    assert!(COMMANDS.contains(&"nuwiki.export.browse"));
    let cfg = wiki_cfg("/wiki");
    let doc = parse("= Page =\nhi\n");
    let html = export::render_page_html(
        &doc,
        Some("{{content}}".into()),
        "Page",
        DiaryDate::today_utc(),
        &cfg.html,
        Some(".wiki"),
        HashMap::new(),
    )
    .unwrap();
    assert!(html.contains("hi"));
}

// :NuwikiAll2HTML[!] — export every page; honour the exclude list and
// per-page output paths.
#[test]
fn nuwiki_all2html_maps_output_paths_and_excludes() {
    let cfg = wiki_cfg("/wiki");
    assert!(export::output_path_for(&cfg.html, "Home").ends_with("Home.html"));
    assert!(
        export::output_path_for(&cfg.html, "diary/2026-05-12").ends_with("diary/2026-05-12.html")
    );

    let patterns = vec!["_drafts/**".to_string()];
    assert!(export::is_excluded(&patterns, "_drafts/secret"));
    assert!(!export::is_excluded(&patterns, "Home"));

    // Both incremental and forced (`!`) variants are advertised.
    assert!(COMMANDS.contains(&"nuwiki.export.allToHtml"));
    assert!(COMMANDS.contains(&"nuwiki.export.allToHtmlForce"));
}

// :NuwikiRss — write `rss.xml` summarising recent diary entries.
#[test]
fn nuwiki_rss_writes_feed_file() {
    let root = std::env::temp_dir().join(format!("nuwiki-cov-rss-{}", std::process::id()));
    let _ = std::fs::remove_dir_all(&root);
    let cfg = WikiConfig::from_root(root.clone());

    let entries = vec![
        diary::DiaryEntry {
            date: DiaryDate::from_ymd(2026, 5, 10).unwrap(),
            uri: Url::from_file_path(root.join("diary/2026-05-10.wiki")).unwrap(),
        },
        diary::DiaryEntry {
            date: DiaryDate::from_ymd(2026, 5, 12).unwrap(),
            uri: Url::from_file_path(root.join("diary/2026-05-12.wiki")).unwrap(),
        },
    ];

    let path = export_ops::write_rss(&cfg, &entries).unwrap();
    assert!(path.ends_with("rss.xml"));
    let xml = std::fs::read_to_string(&path).unwrap();
    assert!(xml.contains("<rss version=\"2.0\">"));
    // Newest entry listed first.
    let p12 = xml.find("2026-05-12").unwrap();
    let p10 = xml.find("2026-05-10").unwrap();
    assert!(p12 < p10);

    let _ = std::fs::remove_dir_all(&root);
}

// =====================================================================
// Group 6: Other
// =====================================================================

// :NuwikiInstall — install/re-install the `nuwiki-ls` binary. This is an
// editor-side action (binary download / cargo build); it is deliberately
// NOT an LSP executeCommand, so the server must not advertise it.
#[test]
fn nuwiki_install_is_editor_only_not_an_lsp_command() {
    assert!(!COMMANDS.iter().any(|c| c.contains("install")));
}

// =====================================================================
// Command-surface cross-check: every documented command that maps to an
// executeCommand handler is actually advertised by the server.
// =====================================================================

#[test]
fn every_documented_lsp_command_is_advertised() {
    let expected = [
        "nuwiki.wiki.openIndex",       // :NuwikiIndex
        "nuwiki.wiki.tabOpenIndex",    // :NuwikiTabIndex
        "nuwiki.wiki.listAll",         // :NuwikiUISelect
        "nuwiki.wiki.gotoPage",        // :NuwikiGoto
        "nuwiki.file.delete",          // :NuwikiDeleteFile
        "nuwiki.diary.openToday",      // :NuwikiMakeDiaryNote
        "nuwiki.diary.openYesterday",  // :NuwikiMakeYesterdayDiaryNote
        "nuwiki.diary.openTomorrow",   // :NuwikiMakeTomorrowDiaryNote
        "nuwiki.diary.openIndex",      // :NuwikiDiaryIndex
        "nuwiki.diary.generateIndex",  // :NuwikiDiaryGenerateLinks
        "nuwiki.diary.next",           // :NuwikiDiaryNextDay
        "nuwiki.diary.prev",           // :NuwikiDiaryPrevDay
        "nuwiki.toc.generate",         // :NuwikiTOC
        "nuwiki.links.generate",       // :NuwikiGenerateLinks
        "nuwiki.workspace.checkLinks", // :NuwikiCheckLinks
        "nuwiki.tags.search",          // :NuwikiSearchTags
        "nuwiki.tags.generateLinks",   // :NuwikiGenerateTagLinks
        "nuwiki.tags.rebuild",         // :NuwikiRebuildTags
        "nuwiki.export.currentToHtml", // :Nuwiki2HTML
        "nuwiki.export.browse",        // :Nuwiki2HTMLBrowse
        "nuwiki.export.allToHtml",     // :NuwikiAll2HTML
        "nuwiki.export.rss",           // :NuwikiRss
    ];
    for cmd in expected {
        assert!(COMMANDS.contains(&cmd), "server must advertise {cmd}");
    }
}