#!/usr/bin/env node
/**
 * One-shot importer: reads script_metadata.json (the format push_scripts.sh
 * writes) and populates the electric-cherry SQLite DB with the equivalent
 * rows. Idempotent — safe to re-run, will INSERT OR IGNORE on collisions.
 *
 * Trigger: docker/entrypoint.sh calls this when LEGACY_METADATA is set and
 * DB_PATH is empty.
 */

import { readFile, rename, stat } from 'node:fs/promises';
import { existsSync } from 'node:fs';
import { env, exit } from 'node:process';
import { db } from '../src/lib/server/db/index.js';

interface LegacyServer {
    komodo_type?: string;
    komodo_name?: string;
    komodo_server?: string;
    iw4m_match?: string;
    iw4m_value?: string;
}
interface LegacyBetaScript {
    staged_as: string;
    target: string;
    beta_file: string;
    backup: string;
    sha256: string;
    revision?: number;
    deployed?: Array<{ server: string; had_original: boolean }>;
}
interface LegacyBeta {
    name: string;
    folder: string;
    opened: string;
    updated?: string;
    revision?: number;
    servers?: string[];
    scripts?: LegacyBetaScript[];
}
interface LegacyDeployServer {
    server: string;
    files: number;
    restart: string;
    players: number | null;
    checked: string | null;
    restarted: string | null;
    attempts: number;
    error: string | null;
}
interface LegacyDeployment {
    id: string;
    action: string;
    started: string;
    servers?: LegacyDeployServer[];
}
interface LegacyRoot {
    servers?: Record<string, LegacyServer>;
    betas?: Record<string, LegacyBeta>;
    deployments?: LegacyDeployment[];
}

async function main(): Promise<void> {
    const src = env.LEGACY_METADATA;
    if (!src) {
        console.error('LEGACY_METADATA env var not set');
        exit(1);
    }
    if (!existsSync(src)) {
        console.log(`no legacy file at ${src} — nothing to import`);
        return;
    }
    const stats = await stat(src);
    if (stats.size === 0) {
        console.log(`legacy file at ${src} is empty — nothing to import`);
        return;
    }

    const raw = await readFile(src, 'utf8');
    const data = JSON.parse(raw) as LegacyRoot;
    const handle = db();

    let servers = 0;
    let betas = 0;
    let betaScripts = 0;
    let betaDeploys = 0;
    let deployments = 0;
    let deploymentServers = 0;

    const tx = handle.transaction(() => {
        // servers
        const insServer = handle.prepare(
            `INSERT OR IGNORE INTO servers
             (name, komodo_type, komodo_name, komodo_server, iw4m_match, iw4m_value)
             VALUES (?, ?, ?, ?, ?, ?)`
        );
        for (const [name, s] of Object.entries(data.servers ?? {})) {
            const r = insServer.run(
                name,
                s.komodo_type ?? 'deployment',
                s.komodo_name ?? name.replace(/_/g, '-'),
                s.komodo_server ?? null,
                s.iw4m_match ?? null,
                s.iw4m_value ?? null
            );
            if (r.changes > 0) servers++;
        }

        // betas
        const insBeta = handle.prepare(
            `INSERT OR IGNORE INTO betas (slug, name, folder, opened_at, updated_at, revision)
             VALUES (?, ?, ?, ?, ?, ?)`
        );
        const insScript = handle.prepare(
            `INSERT INTO beta_scripts (beta_slug, staged_as, target, beta_file, backup, sha256, revision)
             VALUES (?, ?, ?, ?, ?, ?, ?)`
        );
        const insDeploy = handle.prepare(
            `INSERT OR IGNORE INTO beta_deploys (beta_script_id, server, had_original)
             VALUES (?, ?, ?)`
        );

        for (const [slug, b] of Object.entries(data.betas ?? {})) {
            const br = insBeta.run(slug, b.name, b.folder, b.opened, b.updated ?? b.opened, b.revision ?? 1);
            if (br.changes > 0) betas++;
            for (const s of b.scripts ?? []) {
                const sr = insScript.run(
                    slug,
                    s.staged_as,
                    s.target,
                    s.beta_file,
                    s.backup,
                    s.sha256,
                    s.revision ?? 1
                );
                betaScripts++;
                const scriptId = Number(sr.lastInsertRowid);
                for (const d of s.deployed ?? []) {
                    // Skip deploys whose server isn't tracked — matches the
                    // FK constraint. Log so we don't silently lose rows.
                    const exists = handle.prepare('SELECT 1 FROM servers WHERE name = ?').get(d.server);
                    if (!exists) {
                        console.warn(`skipping beta_deploy for unknown server ${d.server}`);
                        continue;
                    }
                    const dr = insDeploy.run(scriptId, d.server, d.had_original ? 1 : 0);
                    if (dr.changes > 0) betaDeploys++;
                }
            }
        }

        // deployments
        const insDep = handle.prepare(
            `INSERT OR IGNORE INTO deployments (id, action, started_at, triggered_by)
             VALUES (?, ?, ?, 'legacy')`
        );
        const insDepSrv = handle.prepare(
            `INSERT OR IGNORE INTO deployment_servers
             (deployment_id, server, files_changed, restart_state, players, checked_at, restarted_at, attempts, error)
             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`
        );
        for (const d of data.deployments ?? []) {
            const r = insDep.run(d.id, d.action, d.started);
            if (r.changes > 0) deployments++;
            for (const s of d.servers ?? []) {
                const exists = handle.prepare('SELECT 1 FROM servers WHERE name = ?').get(s.server);
                if (!exists) continue;
                const sr = insDepSrv.run(
                    d.id,
                    s.server,
                    s.files ?? 0,
                    s.restart ?? 'manual',
                    s.players ?? null,
                    s.checked ?? null,
                    s.restarted ?? null,
                    s.attempts ?? 0,
                    s.error ?? null
                );
                if (sr.changes > 0) deploymentServers++;
            }
        }
    });
    tx();

    console.log(
        `imported: ${servers} servers, ${betas} betas (${betaScripts} scripts, ${betaDeploys} deploys), ` +
            `${deployments} deployments (${deploymentServers} server rows)`
    );

    // Move the source out of the way so we don't re-import on future boots.
    const moved = `${src}.migrated`;
    await rename(src, moved);
    console.log(`renamed ${src} → ${moved}`);
}

main().catch((err) => {
    console.error('legacy import failed:', err);
    exit(2);
});