import { randomUUID } from 'node:crypto';
import type { BlueprintSummary, LaunchRecipeSummary, LaunchFileSummary } from '$lib/deployment-plan.js';
import { config, configFileForGame } from '../config.js';
import { db } from '../db/index.js';
import { zombieMapBySlug, type ZombieGame } from './map-aliases.js';
import { promotedArtifacts } from './promoted-artifacts.js';
import { getPromotedServerConfig, getServerMapConfig, MAP_CONFIG_FILE } from './server-config.js';
import { getBaselineForScope, getVersion, listPromotedOverlaysForScope } from './scripts.js';
import { sha256Buffer } from './files.js';

export interface LaunchRecipe {
    format: 1;
    game: ZombieGame;
    mapSlug: string;
    mapName: string;
    expectedMap: string;
    capturedAt: string;
    image: string;
    configFile: string;
    configSource: string;
    files: (LaunchFileSummary & { content: string })[];
}

export function captureRecipe(game: ZombieGame, mapSlug: string): LaunchRecipe {
    const map = zombieMapBySlug(game, mapSlug);
    if (!map) throw new Error('Choose a supported game and map.');
    const files: LaunchRecipe['files'] = promotedArtifacts(game, map.canonical).map(({ kind, script, version }) => ({
        name: script.name, kind, path: script.target_rel_path, versionId: version.id,
        version: version.version, sha256: version.sha256, size: version.size, content: version.content.toString('base64')
    }));
    const addConfig = (name: string, path: string, content: Buffer) => files.push({
        name, path, kind: 'config', versionId: null, version: null,
        sha256: sha256Buffer(content), size: content.length, content: content.toString('base64')
    });
    const composed = getPromotedServerConfig(game, map.canonical, map.slug);
    let configSource = 'Plutainer defaults, seeded on first boot';
    if (composed) {
        const baseline = getBaselineForScope('game', game)!;
        const layers = [baseline, ...listPromotedOverlaysForScope('game', game), ...listPromotedOverlaysForScope('map', map.canonical)];
        configSource = layers.map(layer => `${layer.name} v${getVersion(layer.current_version_id!)!.version}`).join(' + ');
        addConfig('Composed server configuration', configFileForGame(game), composed);
    }
    addConfig('Selected map', MAP_CONFIG_FILE, getServerMapConfig(game, map.canonical, map.slug)!);
    return { format: 1, game, mapSlug, mapName: map.friendly, expectedMap: map.canonical,
        capturedAt: new Date().toISOString(), image: config.komodo.defaultImage,
        configFile: configFileForGame(game), configSource, files };
}

export function summarizeRecipe(recipe: LaunchRecipe): LaunchRecipeSummary {
    const { format: _format, files, ...summary } = recipe;
    return { ...summary, files: files.map(({ content: _content, ...file }) => file),
        fingerprint: sha256Buffer(Buffer.from(JSON.stringify(recipe))) };
}

export function recipeForDeployment(id: string): { recipe: LaunchRecipe; blueprintName: string | null } | null {
    const row = db().prepare('SELECT recipe, blueprint_name FROM server_launch_recipes WHERE deployment_id = ?')
        .get(id) as { recipe: string; blueprint_name: string | null } | undefined;
    return row ? { recipe: JSON.parse(row.recipe), blueprintName: row.blueprint_name } : null;
}

export function blueprintRecipe(id: string): { recipe: LaunchRecipe; blueprintName: string } {
    const row = db().prepare('SELECT recipe, name FROM server_blueprints WHERE id = ?').get(id) as { recipe: string; name: string } | undefined;
    if (!row) throw new Error('This blueprint is no longer available. Choose another starting point.');
    return { recipe: JSON.parse(row.recipe), blueprintName: row.name };
}

export function listBlueprints(): BlueprintSummary[] {
    return (db().prepare('SELECT * FROM server_blueprints ORDER BY name COLLATE NOCASE').all() as {
        id: string; name: string; description: string; created_at: string; recipe: string;
    }[]).map(row => ({ id: row.id, name: row.name, description: row.description,
        createdAt: row.created_at, recipe: summarizeRecipe(JSON.parse(row.recipe)) }));
}

export function saveBlueprint(input: { name: unknown; description?: unknown; previewId?: unknown; deploymentId?: unknown }): BlueprintSummary {
    if (typeof input.name !== 'string' || !input.name.trim() || input.name.trim().length > 80) throw new Error('Give the blueprint a name of 1–80 characters.');
    if (input.description !== undefined && (typeof input.description !== 'string' || input.description.length > 500)) throw new Error('Keep the description to 500 characters.');
    if ((typeof input.previewId === 'string') === (typeof input.deploymentId === 'string')) throw new Error('Choose exactly one launch preview or recorded deployment.');
    let recipe: LaunchRecipe | undefined;
    if (typeof input.previewId === 'string') {
        const row = db().prepare('SELECT recipe FROM server_launch_previews WHERE id = ? AND expires_at > ?')
            .get(input.previewId, new Date().toISOString()) as { recipe: string } | undefined;
        if (row) recipe = JSON.parse(row.recipe);
    } else if (typeof input.deploymentId === 'string') recipe = recipeForDeployment(input.deploymentId)?.recipe;
    if (!recipe) throw new Error('The launch recipe is unavailable or the preview expired. Generate a fresh preview.');
    if (db().prepare('SELECT id FROM server_blueprints WHERE name = ? COLLATE NOCASE').get(input.name.trim())) throw new Error('A blueprint with this name already exists. Choose a new name.');
    const id = randomUUID();
    const createdAt = new Date().toISOString();
    db().prepare('INSERT INTO server_blueprints (id, name, description, created_at, recipe) VALUES (?, ?, ?, ?, ?)')
        .run(id, input.name.trim(), input.description ?? '', createdAt, JSON.stringify(recipe));
    return { id, name: input.name.trim(), description: (input.description as string) ?? '', createdAt, recipe: summarizeRecipe(recipe) };
}

export function deleteBlueprint(id: string): boolean {
    return db().prepare('DELETE FROM server_blueprints WHERE id = ?').run(id).changes > 0;
}