"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.SQLiteJobQueue = void 0;
/**
 * SQLiteJobQueue — SQLite-backed job queue with exponential backoff retry.
 * Zero external dependencies: uses Kysely + better-sqlite3.
 */
const kysely_1 = require("kysely");
const crypto_1 = require("crypto");
class SQLiteJobQueue {
    constructor(db, logger, pollIntervalMs = 1000) {
        this.db = db;
        this.logger = logger;
        this.pollIntervalMs = pollIntervalMs;
        this.running = false;
        this.activeJobs = 0;
        this.pollTimer = null;
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        this.handlers = new Map();
    }
    registerHandler(type, handler) {
        this.handlers.set(type, handler);
    }
    async enqueue(type, payload, opts) {
        const id = (0, crypto_1.randomUUID)();
        const now = new Date().toISOString();
        const runAt = (opts?.runAt ?? new Date()).toISOString();
        await this.db
            .insertInto('jobs')
            .values({
            id,
            type,
            status: 'pending',
            payload: JSON.stringify(payload),
            result: null,
            error: null,
            attempts: 0,
            max_attempts: opts?.maxAttempts ?? 3,
            priority: opts?.priority ?? 0,
            run_at: runAt,
            started_at: null,
            completed_at: null,
            created_at: now,
            updated_at: now,
        })
            .execute();
        this.logger.debug({ jobId: id, type, runAt }, 'Job enqueued');
        return id;
    }
    start() {
        if (this.running)
            return;
        this.running = true;
        this.logger.info('Job queue started');
        this.scheduleNextPoll();
    }
    pause() {
        this.running = false;
        if (this.pollTimer !== null) {
            clearTimeout(this.pollTimer);
            this.pollTimer = null;
        }
        this.logger.info('Job queue paused');
    }
    async waitForActive(timeoutMs) {
        const deadline = Date.now() + timeoutMs;
        while (this.activeJobs > 0 && Date.now() < deadline) {
            await new Promise((resolve) => setTimeout(resolve, 100));
        }
    }
    scheduleNextPoll() {
        if (!this.running)
            return;
        this.pollTimer = setTimeout(() => {
            this.pollOnce()
                .catch((err) => {
                this.logger.error({ err }, 'Job queue poll error');
            })
                .finally(() => {
                this.scheduleNextPoll();
            });
        }, this.pollIntervalMs);
    }
    async pollOnce() {
        const now = new Date().toISOString();
        // Find one pending job that is due
        const row = await this.db
            .selectFrom('jobs')
            .selectAll()
            .where('status', '=', 'pending')
            .where('run_at', '<=', now)
            .orderBy('priority', 'desc')
            .orderBy('created_at', 'asc')
            .limit(1)
            .executeTakeFirst();
        if (!row)
            return;
        // Optimistic lock: claim the job atomically
        const claimTime = new Date().toISOString();
        const updateResult = await this.db
            .updateTable('jobs')
            .set({
            status: 'running',
            started_at: claimTime,
            attempts: (0, kysely_1.sql) `attempts + 1`,
            updated_at: claimTime,
        })
            .where('id', '=', row.id)
            .where('status', '=', 'pending')
            .executeTakeFirst();
        if (!updateResult || Number(updateResult.numUpdatedRows) === 0) {
            return; // Another worker claimed this job
        }
        this.activeJobs++;
        this.logger.info({ jobId: row.id, type: row.type, attempt: row.attempts + 1 }, 'Job started');
        try {
            const handler = this.handlers.get(row.type);
            if (!handler) {
                throw new Error(`No handler registered for job type: ${row.type}`);
            }
            const payload = JSON.parse(row.payload);
            const result = await handler(payload);
            const completedAt = new Date().toISOString();
            await this.db
                .updateTable('jobs')
                .set({
                status: 'completed',
                result: JSON.stringify(result),
                completed_at: completedAt,
                updated_at: completedAt,
                error: null,
            })
                .where('id', '=', row.id)
                .execute();
            this.logger.info({ jobId: row.id, type: row.type }, 'Job completed');
        }
        catch (err) {
            const failedAt = new Date().toISOString();
            const errorMsg = err instanceof Error ? err.message : String(err);
            // Fetch current attempts count (was incremented above)
            const current = await this.db
                .selectFrom('jobs')
                .select(['attempts', 'max_attempts'])
                .where('id', '=', row.id)
                .executeTakeFirst();
            const attempts = current?.attempts ?? row.attempts + 1;
            const maxAttempts = current?.max_attempts ?? row.max_attempts;
            if (attempts >= maxAttempts) {
                await this.db
                    .updateTable('jobs')
                    .set({ status: 'failed', error: errorMsg, updated_at: failedAt })
                    .where('id', '=', row.id)
                    .execute();
                this.logger.error({ jobId: row.id, type: row.type, attempts, err }, 'Job failed permanently');
            }
            else {
                const backoffMs = Math.min(1000 * Math.pow(2, attempts), 60000);
                const retryAt = new Date(Date.now() + backoffMs).toISOString();
                await this.db
                    .updateTable('jobs')
                    .set({ status: 'pending', run_at: retryAt, error: errorMsg, updated_at: failedAt })
                    .where('id', '=', row.id)
                    .execute();
                this.logger.warn({ jobId: row.id, type: row.type, attempts, backoffMs }, 'Job failed, will retry');
            }
        }
        finally {
            this.activeJobs--;
        }
    }
}
exports.SQLiteJobQueue = SQLiteJobQueue;