import { randomUUID } from 'node:crypto';
import { db } from '../db/index.js';
import { recipeForDeployment, summarizeRecipe } from './launch-recipes.js';

export function beginDeployment(server: string, action: 'create' | 'destroy', triggeredBy = 'ui'): string {
    const id = randomUUID();
    db().prepare(`INSERT INTO server_deployments (id, server, action, state, stage, started_at, triggered_by)
        VALUES (?, ?, ?, 'running', 'Starting', ?, ?)`).run(id, server, action, new Date().toISOString(), triggeredBy);
    recordDeploymentEvent(id, action === 'create' ? 'Server creation requested' : 'Server destruction requested');
    return id;
}

export function deploymentStage(id: string, stage: string): void {
    const previous = db().prepare('SELECT stage FROM server_deployments WHERE id = ?').get(id) as { stage: string } | undefined;
    db().prepare('UPDATE server_deployments SET stage = ? WHERE id = ?').run(stage, id);
    if (previous && previous.stage !== stage) recordDeploymentEvent(id, stage);
}

export function recordDeploymentEvent(id: string, message: string): void {
    db().prepare('INSERT INTO server_deployment_events (deployment_id, created_at, message) VALUES (?, ?, ?)')
        .run(id, new Date().toISOString(), message);
}

export function getDeployment(id: string) {
    const deployment = db().prepare(`SELECT d.*, j.expected_map, EXISTS(SELECT 1 FROM servers s WHERE s.name = d.server) AS server_exists
        FROM server_deployments d LEFT JOIN server_creation_jobs j ON j.deployment_id = d.id WHERE d.id = ?`).get(id);
    if (!deployment) return null;
    const events = db().prepare('SELECT id, created_at, message FROM server_deployment_events WHERE deployment_id = ? ORDER BY id').all(id);
    const launch = recipeForDeployment(id);
    return { deployment, events, recipe: launch ? summarizeRecipe(launch.recipe) : null, blueprintName: launch?.blueprintName ?? null,
        canResumeVerification: canResumeVerification(id) };
}

export function canResumeVerification(id: string): boolean {
    return !!db().prepare(`SELECT d.id FROM server_deployments d
        JOIN server_creation_jobs j ON j.deployment_id = d.id
        JOIN servers s ON s.name = j.server AND s.game_port = j.port
        WHERE d.id = ? AND d.action = 'create' AND d.state IN ('failed', 'interrupted')
        AND NOT EXISTS (SELECT 1 FROM server_deployments newer WHERE newer.server = d.server AND newer.rowid > d.rowid)`)
        .get(id);
}

/** Resume observation only. Never repeat a container creation or restart. */
export function resumeVerification(id: string): boolean {
    return db().transaction(() => {
        if (!canResumeVerification(id)) return false;
        db().prepare("UPDATE server_deployments SET state = 'awaiting-health', finished_at = NULL, error = NULL WHERE id = ?").run(id);
        recordDeploymentEvent(id, 'Resumed verification of the existing server');
        deploymentStage(id, 'Waiting for Komodo health');
        return true;
    })();
}

export function finishDeployment(id: string, result: { ok: boolean; message?: string; warnings?: string[] }): void {
    const state = !result.ok ? 'failed' : result.warnings?.length ? 'warning' : 'done';
    db().prepare(`UPDATE server_deployments SET state = ?, finished_at = ?, error = ?, warnings = ? WHERE id = ?`)
        .run(state, new Date().toISOString(), result.message ?? null, JSON.stringify(result.warnings ?? []), id);
    for (const warning of result.warnings ?? []) recordDeploymentEvent(id, warning);
    recordDeploymentEvent(id, result.ok ? (state === 'warning' ? 'Completed with warnings' : 'Completed') : `Failed: ${result.message ?? 'Unknown error'}`);
}

export function listDeployments() {
    return db().prepare(`SELECT d.*, EXISTS(SELECT 1 FROM servers s WHERE s.name = d.server) AS server_exists
        FROM server_deployments d ORDER BY started_at DESC, rowid DESC`).all();
}

export function interruptDeployments(): void {
    const running = db().prepare("SELECT id FROM server_deployments WHERE state = 'running'").all() as { id: string }[];
    db().prepare(`UPDATE server_deployments SET state = 'interrupted', finished_at = ?,
        error = 'The application restarted before this operation finished. Check the server before retrying.'
        WHERE state = 'running'`).run(new Date().toISOString());
    for (const { id } of running) recordDeploymentEvent(id, 'Interrupted by application restart. Check the server before retrying.');
}