import { connect } from '@tursodatabase/database';
import { spawnSync } from 'node:child_process';
import { mkdir, readFile, writeFile } from 'node:fs/promises';
import { join, resolve } from 'node:path';
import { randomUUID } from 'node:crypto';

const bundleArgument = process.argv
  .slice(2)
  .find((argument) => !argument.startsWith('--'));
if (!bundleArgument || !process.argv.includes('--confirm-merge')) {
  console.error(
    'Usage: node scripts/managed-images-import.mjs <bundle.json> --confirm-merge [--update-existing]',
  );
  process.exit(2);
}
const updateExisting = process.argv.includes('--update-existing');
const bundlePath = resolve(bundleArgument);
const bundle = JSON.parse(await readFile(bundlePath, 'utf8'));
if (
  bundle?.format !== 'shd-build-managed-images' ||
  bundle?.version !== 1 ||
  !Array.isArray(bundle.images)
) {
  throw new Error(
    'The selected file is not a supported SHD.build managed-image bundle.',
  );
}
for (const image of bundle.images) {
  if (
    typeof image?.row?.id !== 'string' ||
    !/^[0-9a-f-]{36}$/i.test(image.row.id) ||
    typeof image.row.storage_key !== 'string' ||
    !/^(?:library|talent|brand_set|os_protocol|skill_chip|specialization|specialization_ability|specialization_node)-[0-9a-f-]{36}\.webp$/i.test(
      image.row.storage_key,
    ) ||
    typeof image.contentBase64 !== 'string'
  ) {
    throw new Error('The bundle contains an invalid managed image.');
  }
  const isItemRender = ['weapon_render', 'gear_render'].includes(
    image.row.source_entity_type,
  );
  if (
    image.row.source_entity_type &&
    (typeof image.row.source_entity_id !== 'string' ||
      !/^[0-9a-f-]{36}$/i.test(image.row.source_entity_id) ||
      (isItemRender
        ? !image.row.storage_key.startsWith('library-')
        : !image.row.storage_key.startsWith(
            `${image.row.source_entity_type}-`,
          )))
  )
    throw new Error('The bundle contains an invalid linked ISAC image.');
}

const backup = spawnSync(process.execPath, ['scripts/db-backup.mjs'], {
  cwd: process.cwd(),
  stdio: 'inherit',
  env: process.env,
});
if (backup.error) throw backup.error;
if (backup.status !== 0)
  throw new Error('Safety backup failed; no managed images were imported.');
const assetBackup = spawnSync(
  process.execPath,
  ['scripts/isac-data-export.mjs'],
  {
    cwd: process.cwd(),
    stdio: 'inherit',
    env: process.env,
  },
);
if (assetBackup.error) throw assetBackup.error;
if (assetBackup.status !== 0)
  throw new Error(
    'Uploaded-asset safety snapshot failed; no managed images were imported.',
  );

const databasePath = resolve(
  process.env.TDR_DATABASE_PATH || './data/shd-build-development.db',
);
const storageDirectory = resolve(
  process.env.TDR_GAME_ICON_STORAGE_PATH || './data/game-icons',
);
const database = await connect(databasePath);
await mkdir(storageDirectory, { recursive: true });
let inserted = 0;
let updated = 0;
let unchanged = 0;

const preflight = [];
for (const image of bundle.images) {
  const row = image.row;
  const existing = await (
    await database.prepare('SELECT * FROM managed_images WHERE id=?')
  ).get(row.id);
  if (existing && !updateExisting) {
    const same = [
      'name',
      'category',
      'tags_json',
      'is_icon',
      'force_white',
      'storage_key',
      'byte_size',
      'width',
      'height',
      'source_entity_type',
      'source_entity_id',
    ].every((key) => String(existing[key]) === String(row[key]));
    if (!same)
      throw new Error(
        `Image ${row.id} already exists with different metadata. Re-run with --update-existing after review.`,
      );
    unchanged++;
    continue;
  }
  const creator = await (
    await database.prepare('SELECT id FROM users WHERE id=?')
  ).get(row.created_by);
  if (!creator)
    throw new Error(
      `Image "${row.name}" references a creator that does not exist in the target database.`,
    );
  const nameConflict = await (
    await database.prepare(
      'SELECT id FROM managed_images WHERE name=? COLLATE NOCASE AND id<>?',
    )
  ).get(row.name, row.id);
  if (nameConflict)
    throw new Error(
      `Image name "${row.name}" is already assigned to a different target asset.`,
    );
  if (row.source_entity_type && row.source_entity_id) {
    const sourceConflict = await (
      await database.prepare(
        'SELECT id FROM managed_images WHERE source_entity_type=? AND source_entity_id=? AND id<>?',
      )
    ).get(row.source_entity_type, row.source_entity_id, row.id);
    if (sourceConflict)
      throw new Error(
        `The ${row.source_entity_type} image ${row.source_entity_id} is already registered under a different library asset.`,
      );
  }
  preflight.push({ image, existing });
}

await database.exec('BEGIN');
try {
  for (const { image, existing } of preflight) {
    const row = image.row;
    await writeFile(
      join(storageDirectory, row.storage_key),
      Buffer.from(image.contentBase64, 'base64'),
      {
        mode: 0o600,
        flag: existing || row.source_entity_type ? 'w' : 'wx',
      },
    );
    if (existing) {
      await (
        await database.prepare(`UPDATE managed_images SET
			name=?,category=?,tags_json=?,is_icon=?,force_white=?,storage_key=?,original_filename=?,
			byte_size=?,width=?,height=?,source_entity_type=?,source_entity_id=?,updated_at=? WHERE id=?`)
      ).run(
        row.name,
        row.category,
        row.tags_json,
        row.is_icon,
        row.force_white,
        row.storage_key,
        row.original_filename,
        row.byte_size,
        row.width,
        row.height,
        row.source_entity_type ?? null,
        row.source_entity_id ?? null,
        row.updated_at,
        row.id,
      );
      updated++;
    } else {
      await (
        await database.prepare(`INSERT INTO managed_images
			(id,name,category,tags_json,is_icon,force_white,storage_key,original_filename,byte_size,width,height,
			 source_entity_type,source_entity_id,created_by,created_at,updated_at)
			VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)`)
      ).run(
        row.id,
        row.name,
        row.category,
        row.tags_json,
        row.is_icon,
        row.force_white,
        row.storage_key,
        row.original_filename,
        row.byte_size,
        row.width,
        row.height,
        row.source_entity_type ?? null,
        row.source_entity_id ?? null,
        row.created_by,
        row.created_at,
        row.updated_at,
      );
      inserted++;
    }
    await (
      await database.prepare(`INSERT INTO audit_log
		(id,actor_id,entity_type,entity_id,action,before_json,after_json,created_at) VALUES(?,?,?,?,?,?,?,?)`)
    ).run(
      randomUUID(),
      row.created_by,
      'system_configuration',
      row.id,
      existing ? 'image.import_updated' : 'image.imported',
      existing ? JSON.stringify(existing) : null,
      JSON.stringify(row),
      new Date().toISOString(),
    );
  }
  await database.exec('COMMIT');
} catch (error) {
  await database.exec('ROLLBACK');
  throw error;
}
console.log(
  `Managed-image merge complete: ${inserted} inserted, ${updated} updated, ${unchanged} unchanged.`,
);