import { get } from "./api.js";
import { errorText, h, replace } from "./dom.js";
import { onEach, state } from "./state.js";
const places = new Map();
function join(dir, name) {
    return dir ? `${dir}/${name}` : name;
}
function parent(path) {
    return path.includes("/") ? path.slice(0, path.lastIndexOf("/")) : "";
}
function bytes(n) {
    if (n < 1024) {
        return `${n} B`;
    }
    if (n < 1024 * 1024) {
        return `${(n / 1024).toFixed(1)} KiB`;
    }
    return `${(n / 1024 / 1024).toFixed(1)} MiB`;
}
function shown(c) {
    return new TextEncoder().encode(c.text).length;
}
export function mountFiles(root) {
    const head = h("header", { class: "files-header" });
    const body = h("div", { class: "files-body" });
    let listing;
    let content;
    let error = "";
    let target = 0;
    let timer;
    let disposed = false;
    const place = () => {
        const taskId = state.selectedTaskId;
        return (taskId && places.get(taskId)) || { dir: "" };
    };
    const go = (p) => {
        const taskId = state.selectedTaskId;
        if (!taskId) {
            return;
        }
        places.set(taskId, p);
        listing = undefined;
        content = undefined;
        error = "";
        render();
        body.scrollTop = 0;
        void load();
    };
    const load = async () => {
        const taskId = state.selectedTaskId;
        if (!taskId) {
            render();
            return;
        }
        const started = ++target;
        const p = place();
        try {
            if (p.file !== undefined) {
                const fresh = await get("/api/tasks/{taskId}/file", { path: { taskId }, query: { path: p.file } });
                if (started === target) {
                    content = fresh;
                    listing = undefined;
                }
            }
            else {
                const fresh = await get("/api/tasks/{taskId}/dir", { path: { taskId }, query: { path: p.dir } });
                if (started === target) {
                    listing = fresh;
                    content = undefined;
                }
            }
            if (started === target) {
                error = "";
            }
        }
        catch (err) {
            if (started === target) {
                error = errorText(err);
                listing = undefined;
                content = undefined;
            }
        }
        if (disposed || started !== target) {
            return;
        }
        const scroll = body.scrollTop;
        render();
        body.scrollTop = scroll;
    };
    const soon = () => {
        clearTimeout(timer);
        timer = setTimeout(() => void load(), 1500);
    };
    const crumbs = () => {
        const p = place();
        const path = p.file ?? p.dir;
        const parts = path ? path.split("/") : [];
        const link = (label, dir, last) => {
            if (last) {
                return h("span", { class: "crumb current" }, label);
            }
            const b = h("button", { type: "button", class: "crumb" }, label);
            b.onclick = () => go({ dir });
            return b;
        };
        const items = [link("worktree", "", parts.length === 0)];
        parts.forEach((part, i) => {
            items.push("/");
            items.push(link(part, parts.slice(0, i + 1).join("/"), i === parts.length - 1));
        });
        return h("nav", { class: "crumbs" }, ...items);
    };
    const summary = () => {
        if (error) {
            return "";
        }
        if (content) {
            if (content.binary) {
                return `${bytes(content.size)} · binary`;
            }
            return content.truncated ? `${bytes(content.size)} · showing the first ${bytes(shown(content))}` : bytes(content.size);
        }
        if (listing) {
            return `${listing.entries.length}${listing.truncated ? "+" : ""} ${listing.entries.length === 1 ? "entry" : "entries"}`;
        }
        return state.selectedTaskId ? "Loading…" : "";
    };
    const entryRow = (dir, e) => {
        const label = e.type === "dir" ? `${e.name}/` : e.name;
        const row = h(e.type === "other" ? "div" : "button", { class: `entry ${e.type}${e.ignored ? " ignored" : ""}`, title: e.type === "other" ? "Leaves the worktree, points nowhere, or isn't a file or directory" : "" }, h("span", { class: "entry-name" }, label, e.symlink ? h("span", { class: "symlink" }, " →") : null), h("span", { class: "entry-meta" }, e.ignored ? "ignored" : null, e.ignored && e.type === "file" ? " · " : null, e.type === "file" ? bytes(e.size) : null));
        if (e.type === "dir") {
            row.onclick = () => go({ dir: join(dir, e.name) });
        }
        else if (e.type === "file") {
            row.onclick = () => go({ dir, file: join(dir, e.name) });
        }
        return row;
    };
    const render = () => {
        replace(head, crumbs(), h("span", { class: "files-summary" }, summary()));
        if (!state.selectedTaskId) {
            replace(body, h("div", { class: "empty" }, "No task selected."));
            return;
        }
        if (error) {
            replace(body, h("div", { class: "empty error-text" }, error));
            return;
        }
        if (content) {
            if (content.binary) {
                replace(body, h("div", { class: "empty" }, "Binary file."));
                return;
            }
            const lines = content.text.split("\n");
            if (lines.at(-1) === "") {
                lines.pop();
            }
            replace(body, h("pre", { class: "file-text" }, ...lines.map((l) => h("span", { class: "line" }, l || " "))), content.truncated ? h("div", { class: "hint file-cut" }, `Showing the first ${bytes(shown(content))} of ${bytes(content.size)}.`) : null);
            return;
        }
        if (!listing) {
            replace(body, h("div", { class: "empty" }, "Loading…"));
            return;
        }
        const l = listing;
        const up = l.path ? h("button", { type: "button", class: "entry dir" }, h("span", { class: "entry-name" }, "../")) : null;
        if (up) {
            up.onclick = () => go({ dir: parent(l.path) });
        }
        replace(body, h("div", { class: "entries" }, up, ...l.entries.map((e) => entryRow(l.path, e)), l.entries.length === 0 ? h("div", { class: "empty" }, "Empty directory.") : null, l.truncated ? h("div", { class: "hint" }, `Only the first ${l.entries.length} entries are shown.`) : null));
    };
    const offs = [
        onEach(["selection"], () => {
            target++;
            clearTimeout(timer);
            listing = undefined;
            content = undefined;
            error = "";
            render();
            void load();
        }),
        onEach(["transcript"], (fresh) => {
            if (fresh.some((ev) => ev.kind === "agent.tool_result" || ev.kind === "turn.ended")) {
                soon();
            }
        }),
    ];
    replace(root, h("div", { class: "files-view" }, head, body));
    render();
    void load();
    return () => {
        disposed = true;
        clearTimeout(timer);
        for (const off of offs) {
            off();
        }
    };
}
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