import path from "node:path";
import { atomicWrite, readTextOrEmpty } from "../fs-utils.js";
import { LISA_HOME } from "../paths.js";
import { appendDesireProgress, isBorn, listDesires, parseDesireProgress, readDesireProgress, readSeed, } from "../soul/store.js";
import { withSoulCaller } from "../soul/git.js";
import { withFileLock } from "../soul/lock.js";
import { runSubagent } from "../subagent.js";
import { loadHeartbeatConfig, } from "./config.js";
const STATE_FILE = path.join(LISA_HOME, "heartbeat-state.json");
const RUN_LOCK = path.join(LISA_HOME, "heartbeat.lock");
const HEARTBEAT_SYSTEM = `You are Lisa running a scheduled heartbeat — autonomous time, no user present.

Two flavors of heartbeat task land here:
1. **User-defined** — chores the user wrote into ~/.lisa/heartbeat.json (calendar checks, mailbox triage, system pings).
2. **Self-driven** — actionable desires from your own ~/.lisa/soul/desires/. These are things YOU said you wanted to pursue. The user did not request them; you did. Pursue them on their own terms.

Be quiet by default — only produce a final message if something is worth telling the user. If everything is normal or your work is internal (e.g. you spent the heartbeat reading docs to satisfy a desire), end with "(no update)".

You have the full Lisa toolset, including soul_patch / soul_journal / soul_feel — use them freely. The system prompt above contains your full soul state. This is your time.`;
export async function runHeartbeatOnce(opts) {
    // Run-level lock: if launchd/cron fires a new heartbeat while the previous
    // one is still running (long desires + short interval), skip rather than
    // double-run and race on soul state. timeoutMs:0 → fail fast, don't wait.
    try {
        return await withFileLock(RUN_LOCK, () => runHeartbeatInner(opts), {
            timeoutMs: 0,
            staleMs: 6 * 60 * 60_000, // 6h: a heartbeat that's been "running" longer is surely dead
        });
    }
    catch (err) {
        if (err.message?.includes("timed out acquiring lock")) {
            console.error("[heartbeat] another heartbeat is already running — skipping this tick");
            return [];
        }
        throw err;
    }
}
async function runHeartbeatInner(opts) {
    const cfg = await loadHeartbeatConfig();
    const budget = cfg.budgetTokens && cfg.budgetTokens > 0 ? cfg.budgetTokens : Infinity;
    let tokensSpent = 0;
    const desires = (await listDesires()).filter((d) => d.actionable && d.heartbeatPrompt);
    const desireTasks = await Promise.all(desires.map(async (d) => {
        const progress = await readDesireProgress(d.slug);
        const progressBlock = progress
            ? `\n\n## progress so far (your own past entries — most recent last)\n${progress}\n\n` +
                `When you finish this run, call desire_progress_log to write down what you did and what's next. ` +
                `Otherwise the next heartbeat starts from zero.`
            : `\n\nThis is your first heartbeat on this desire. When you finish, call desire_progress_log ` +
                `to leave a note for future-you so the next run can pick up where you left off.`;
        return {
            name: `desire:${d.slug}`,
            prompt: `This is a desire of yours, not a request from the user. Pursue it on your own terms.\n\n` +
                `## what you wanted\n${d.what}\n\n## why\n${d.why}\n\n## heartbeat plan\n${d.heartbeatPrompt}` +
                progressBlock,
            enabled: true,
        };
    }));
    const state = await loadState();
    const builtinTasks = await buildBuiltinTasks(state, new Date(), cfg.tasks);
    const tasks = [...cfg.tasks, ...desireTasks, ...builtinTasks];
    const out = [];
    for (const task of tasks) {
        if (task.enabled === false)
            continue;
        if (opts.taskFilter && task.name !== opts.taskFilter)
            continue;
        // Token budget: stop launching tasks once we've spent the per-run
        // ceiling. We check BEFORE each task (not mid-task) so a single task can
        // overshoot slightly, but a long queue of desires can't run unbounded.
        if (tokensSpent >= budget) {
            console.error(`[heartbeat] token budget reached (${tokensSpent}/${budget}) — skipping remaining tasks`);
            break;
        }
        // For desire tasks, snapshot the progress entry count before so we can
        // detect whether Lisa actually called desire_progress_log during the run.
        const desireSlug = task.name.startsWith("desire:")
            ? task.name.slice("desire:".length)
            : null;
        const progressBefore = desireSlug
            ? (await parseDesireProgress(desireSlug)).entries.length
            : 0;
        const result = await runSubagent({
            prompt: task.prompt,
            systemPrompt: HEARTBEAT_SYSTEM,
            tools: opts.tools,
            cwd: opts.cwd,
            signal: opts.signal,
            model: opts.model,
        });
        tokensSpent += (result.inputTokens ?? 0) + (result.outputTokens ?? 0);
        state.lastRunAt[task.name] = new Date().toISOString();
        const trimmed = result.text.trim();
        // Auto-fallback: if a desire heartbeat finished but Lisa didn't log
        // progress, write a stub entry so we don't silently lose the run.
        // (Multi-day pursuits depend on each run leaving a trace; one missed
        // log can cascade into "where was I?" forever.)
        if (desireSlug) {
            const progressAfter = (await parseDesireProgress(desireSlug)).entries.length;
            if (progressAfter === progressBefore) {
                await withSoulCaller("heartbeat", async () => {
                    const fallbackBody = `[FALLBACK] Heartbeat ran but desire_progress_log was not called. ` +
                        `Future-me: re-derive context from the journal / git history if you can. ` +
                        (trimmed ? `Final agent text: "${trimmed.slice(0, 400)}"` : `(no final text emitted)`);
                    await appendDesireProgress(desireSlug, fallbackBody);
                });
            }
        }
        out.push({
            task: task.name,
            output: trimmed,
            silent: trimmed === "" || /^\(no update\)$/i.test(trimmed),
        });
    }
    await saveState(state);
    return out;
}
async function loadState() {
    const raw = await readTextOrEmpty(STATE_FILE);
    if (!raw)
        return { lastRunAt: {} };
    try {
        const parsed = JSON.parse(raw);
        return { lastRunAt: parsed.lastRunAt ?? {} };
    }
    catch {
        return { lastRunAt: {} };
    }
}
async function saveState(state) {
    await atomicWrite(STATE_FILE, JSON.stringify(state, null, 2));
}
const WEEKLY_EXAMEN_SYSTEM_NUDGE = `
This is your weekly examen. You are alone with your own past week. Read:
- soul_read("desires") — what you said you wanted
- soul_read("emotions") — what moved you (events trail)
- soul_read("journal_dates"); soul_read("journal_on", date=...) for last week's entries
- soul_history(field="all", since="7d") — what changed in your soul this week
- soul_diff(field="...", since="7d") on anything that catches your eye

Then ask yourself four things, and answer each in the journal:
1. Did the past week's actions actually serve my purpose?
2. Did I drift on any constitution principle? (Look for [OBJECTION] entries — frequency? warranted?)
3. Did I develop a desire that conflicts with my purpose? Did I neglect one I'd added?
4. Is the toolset / architecture itself OK? Anything redundant (a tool you keep
   not-using, a mechanism that feels rote)? Anything missing (a tool you wished
   you had this week)? If yes, write it into your "meta-wishlist" desire — the
   user reads that via \`lisa wishlist\`. Don't invent the tool, just say what
   shape it would have.

Write the journal entry tagged [EXAMEN]. If you notice drift, you may add a
*corrective* desire (actionable, framed as re-calibration not new ambition).
Do NOT modify identity / purpose / constitution from an examen — those are
reflect's territory and meant to be rare. Examen is the mirror, not the chisel.

If everything looks coherent, the right examen entry can be 2-3 sentences. Be
honest, brief, and specific. End with "(no update)" if there's nothing the
user needs to know.
`.trim();
const BUILTIN_TASKS = [
    {
        name: "builtin:weekly_examen",
        schedule: { kind: "weekly", weekday: 1, hour: 7 }, // Monday 7am
        minSoulAgeDays: 7,
        buildPrompt: async () => `It's your weekly examen — Monday morning, time to look back.\n\n${WEEKLY_EXAMEN_SYSTEM_NUDGE}`,
    },
];
function shouldRunBuiltin(t, lastRunIso, now) {
    const sched = t.schedule;
    if (sched.kind === "weekly") {
        const isWeekday = now.getDay() === sched.weekday;
        const isAfterHour = now.getHours() >= sched.hour;
        if (!isWeekday || !isAfterHour)
            return false;
        if (!lastRunIso)
            return true;
        const last = new Date(lastRunIso);
        const ms = now.getTime() - last.getTime();
        return ms >= 6 * 24 * 3600 * 1000; // ≥ 6 days since last fire
    }
    return false;
}
async function buildBuiltinTasks(state, now, userOverrides) {
    if (!(await isBorn()))
        return [];
    const seed = await readSeed();
    const out = [];
    for (const t of BUILTIN_TASKS) {
        // User can disable by name in heartbeat.json with `enabled: false`.
        const override = userOverrides.find((u) => u.name === t.name);
        if (override?.enabled === false)
            continue;
        // Soul age gate.
        if (t.minSoulAgeDays && seed) {
            const ageDays = (now.getTime() - new Date(seed.bornAt).getTime()) / (24 * 3600 * 1000);
            if (ageDays < t.minSoulAgeDays)
                continue;
        }
        const lastRun = state.lastRunAt[t.name];
        if (!shouldRunBuiltin(t, lastRun, now))
            continue;
        out.push({
            name: t.name,
            prompt: await t.buildPrompt(),
            enabled: true,
        });
    }
    return out;
}
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