import { get } from "./api.js";
import { errorText, h, replace } from "./dom.js";
import { onEach, state } from "./state.js";
const statusLetter = {
    added: "A",
    modified: "M",
    deleted: "D",
    renamed: "R",
    type_changed: "T",
};
const open = new Set();
let range = "main";
function turnStart() {
    const ev = state.transcript.findLast((e) => e.kind === "user.message" && typeof e.payload["head"] === "string");
    return ev?.payload["head"];
}
export function mountChanges(root, compact = false) {
    const head = h("header", { class: "changes-header" });
    const list = h("div", { class: "changes-list" });
    const diffs = new Map();
    let changes;
    let error = "";
    let loading = false;
    let again = false;
    let timer;
    let disposed = false;
    let loadedSince;
    const mode = () => (compact ? "main" : range);
    const load = async () => {
        const taskId = state.selectedTaskId;
        if (!taskId) {
            changes = undefined;
            render();
            return;
        }
        const since = mode() === "turn" ? turnStart() : undefined;
        if (mode() === "turn" && !since) {
            changes = undefined;
            error = "No turn has started in this task yet.";
            render();
            return;
        }
        if (loading) {
            again = true;
            return;
        }
        loading = true;
        renderHead();
        try {
            const fresh = await get("/api/tasks/{taskId}/changes", { path: { taskId }, query: { since } });
            if (disposed || state.selectedTaskId !== taskId) {
                return;
            }
            loadedSince = since;
            if (fresh.tree !== changes?.tree || fresh.base !== changes?.base) {
                diffs.clear();
            }
            changes = fresh;
            error = "";
        }
        catch (err) {
            error = errorText(err);
        }
        finally {
            loading = false;
        }
        render();
        if (again) {
            again = false;
            void load();
        }
    };
    const soon = () => {
        clearTimeout(timer);
        timer = setTimeout(() => void load(), 1500);
    };
    const toggle = () => {
        if (compact) {
            return null;
        }
        const button = (r, label) => {
            const b = h("button", { type: "button", class: r === range ? "active" : "" }, label);
            b.onclick = () => {
                if (range === r) {
                    return;
                }
                range = r;
                changes = undefined;
                diffs.clear();
                error = "";
                render();
                void load();
            };
            return b;
        };
        return h("nav", { class: "range-tabs" }, button("main", "Since main"), button("turn", "This turn"));
    };
    const renderHead = () => {
        if (!changes) {
            replace(head, h("span", { class: "changes-summary" }, error || (state.selectedTaskId ? "Loading changes…" : "No task selected.")), toggle());
            return;
        }
        const adds = changes.files.reduce((n, f) => n + f.additions, 0);
        const dels = changes.files.reduce((n, f) => n + f.deletions, 0);
        replace(head, h("span", { class: "changes-summary" }, `${changes.files.length} ${changes.files.length === 1 ? "file" : "files"} `, h("span", { class: "adds" }, `+${adds}`), " ", h("span", { class: "dels" }, `−${dels}`), h("span", { class: "base", title: changes.base }, ` vs ${changes.base.slice(0, 8)}`), error && h("span", { class: "error-text" }, ` ${error}`)), toggle());
    };
    const fileRow = (c, f) => {
        const body = h("div", { class: "file-diff" });
        const details = h("details", { class: `file ${f.status}`, open: open.has(f.path) }, h("summary", {}, h("span", { class: `status ${f.status}`, title: f.status.replace("_", " ") }, statusLetter[f.status]), h("span", { class: "file-path" }, f.old_path ? `${f.old_path} → ${f.path}` : f.path), f.binary ? h("span", { class: "binary" }, "binary") : h("span", { class: "counts" }, h("span", { class: "adds" }, `+${f.additions}`), " ", h("span", { class: "dels" }, `−${f.deletions}`))), body);
        const show = async () => {
            const cached = diffs.get(f.path);
            if (cached !== undefined) {
                replace(body, renderPatch(cached));
                return;
            }
            replace(body, h("div", { class: "hint" }, "loading…"));
            try {
                const d = await get("/api/tasks/{taskId}/diff", {
                    path: { taskId: state.selectedTaskId },
                    query: { base: c.base, tree: c.tree, path: f.path, old_path: f.old_path },
                });
                diffs.set(f.path, d.patch);
                replace(body, renderPatch(d.patch));
            }
            catch (err) {
                replace(body, h("div", { class: "error-text" }, errorText(err)));
            }
        };
        details.ontoggle = () => {
            if (details.open) {
                open.add(f.path);
                void show();
            }
            else {
                open.delete(f.path);
            }
        };
        if (details.open) {
            void show();
        }
        return details;
    };
    const render = () => {
        renderHead();
        if (compact) {
            return;
        }
        if (!state.selectedTaskId) {
            replace(list, h("div", { class: "empty" }, "No task selected."));
            return;
        }
        if (!changes) {
            replace(list, h("div", { class: "empty" }, error ? "" : "Loading…"));
            return;
        }
        if (changes.files.length === 0) {
            replace(list, h("div", { class: "empty" }, mode() === "turn" ? "No changes this turn." : "No changes from the default branch."));
            return;
        }
        const c = changes;
        const files = [...c.files].sort((a, b) => a.path.localeCompare(b.path));
        replace(list, ...files.map((f) => fileRow(c, f)));
    };
    const offs = [
        onEach(["selection"], () => {
            changes = undefined;
            diffs.clear();
            error = "";
            render();
            void load();
        }),
        onEach(["transcript"], (fresh) => {
            if (mode() === "turn" && turnStart() !== loadedSince) {
                void load();
                return;
            }
            if (fresh.some((ev) => ev.kind === "agent.tool_result" || ev.kind === "turn.ended")) {
                soon();
            }
        }),
    ];
    replace(root, compact ? h("div", { class: "changes-view compact" }, head) : h("div", { class: "changes-view" }, head, list));
    render();
    void load();
    return () => {
        disposed = true;
        clearTimeout(timer);
        for (const off of offs) {
            off();
        }
    };
}
function renderPatch(patch) {
    const lines = patch.split("\n");
    const start = lines.findIndex((l) => l.startsWith("@@"));
    const body = start === -1 ? [] : lines.slice(start);
    if (body.length === 0) {
        return h("div", { class: "hint" }, "No textual changes.");
    }
    return h("pre", { class: "diff" }, ...body.map((l) => {
        const cls = l.startsWith("@@") ? "hunk" : l.startsWith("+") ? "add" : l.startsWith("-") ? "del" : l.startsWith("\\") ? "meta" : "ctx";
        return h("span", { class: `line ${cls}` }, l || " ");
    }));
}
//# sourceMappingURL=changes.js.map