#!/usr/bin/env node

import { pathToFileURL } from 'node:url';

import {
  callSpacetimeProcedure,
  callSpacetimeProcedureViaCli,
  encodeSpacetimeCliOption,
  ensureProcedureOk,
  parsePositiveInteger,
} from './spacetime-migration-common.mjs';

const PROCEDURE_NAME =
  'normalize_editor_character_animation_metadata_and_return';
const SCOPES = ['asset', 'project-resource', 'showcase', 'canvas'];
const DEFAULT_CHUNK_SIZE = 25;
const CANVAS_MAX_CHUNK_SIZE = 5;
const SHA256_PATTERN = /^[0-9a-f]{64}$/u;

function usage() {
  return `用法：
  node scripts/spacetime-normalize-editor-character-actions.mjs \\
    --database <name> --server <name-or-url> [--chunk-size <1-25>] [--apply]

默认按 asset、project-resource、showcase、canvas 的固定顺序执行全量 dry-run，不修改数据。
追加 --apply 后，每批仍会先 dry-run；只有 blocker 为零，才携带该批返回的 SHA-256 立即 apply。
apply 完成后脚本会再次从头 dry-run，要求四个 scope 的 matched/blocker 均为零。
必须使用已授权 database migration operator 的 spacetime CLI 登录态，并显式指定 server。`;
}

export function parseOptions(argv, env = process.env) {
  const options = {
    apply: false,
    chunkSize: DEFAULT_CHUNK_SIZE,
    database: env.GENARRATIVE_SPACETIME_DATABASE || '',
    passthrough: [],
    server: env.GENARRATIVE_SPACETIME_SERVER || '',
    serverUrl: env.GENARRATIVE_SPACETIME_SERVER_URL || '',
    token: env.GENARRATIVE_SPACETIME_TOKEN || '',
    useHttp: false,
  };
  for (let index = 0; index < argv.length; index += 1) {
    const arg = argv[index];
    const readValue = () => {
      const value = argv[index + 1];
      if (!value || value.startsWith('--')) {
        throw new Error(`${arg} 缺少参数值。`);
      }
      index += 1;
      return value.trim();
    };
    if (arg === '--database') {
      options.database = readValue();
    } else if (arg === '--server') {
      options.server = readValue();
    } else if (arg === '--server-url') {
      options.serverUrl = readValue();
    } else if (arg === '--token') {
      options.token = readValue();
    } else if (arg === '--chunk-size') {
      options.chunkSize = parsePositiveInteger(readValue(), arg);
    } else if (arg === '--apply') {
      options.apply = true;
    } else if (arg === '--use-http') {
      options.useHttp = true;
    } else if (arg === '--no-config' || arg === '--anonymous') {
      options.passthrough.push(arg);
    } else if (arg === '--help' || arg === '-h') {
      options.help = true;
    } else {
      throw new Error(`未知参数: ${arg}`);
    }
  }
  if (options.chunkSize > DEFAULT_CHUNK_SIZE) {
    throw new Error(`--chunk-size 不能超过 ${DEFAULT_CHUNK_SIZE}。`);
  }
  return options;
}

export function buildNormalizationInput({
  scope,
  cursor = null,
  limit,
  dryRun,
  expectedBatchSha256 = null,
}) {
  if (!SCOPES.includes(scope)) {
    throw new Error(`未知角色动作规范化 scope: ${scope}`);
  }
  if (!Number.isInteger(limit) || limit < 1) {
    throw new Error('角色动作规范化 limit 必须是正整数。');
  }
  if (scope === 'canvas' && limit > CANVAS_MAX_CHUNK_SIZE) {
    throw new Error(`canvas scope limit 不能超过 ${CANVAS_MAX_CHUNK_SIZE}。`);
  }
  if (!dryRun && !SHA256_PATTERN.test(expectedBatchSha256 || '')) {
    throw new Error('apply 必须绑定 dry-run 返回的 64 位 batch SHA-256。');
  }
  return {
    scope,
    cursor: encodeSpacetimeCliOption(cursor),
    limit,
    dry_run: dryRun,
    expected_batch_sha_256: encodeSpacetimeCliOption(
      dryRun ? null : expectedBatchSha256,
    ),
  };
}

function scopeLimit(scope, chunkSize) {
  return scope === 'canvas'
    ? Math.min(chunkSize, CANVAS_MAX_CHUNK_SIZE)
    : chunkSize;
}

function assertSafeBatch(result, scope) {
  ensureProcedureOk(result);
  if (result.scope !== scope) {
    throw new Error(`procedure 返回 scope ${result.scope}，预期为 ${scope}。`);
  }
  if (result.blocker_count !== 0 || result.blocker_ids.length !== 0) {
    throw new Error(
      `${scope} scope 存在 ${result.blocker_count} 个 blocker：${result.blocker_ids.join(', ')}`,
    );
  }
  if (!SHA256_PATTERN.test(result.batch_sha256 || '')) {
    throw new Error(`${scope} scope 未返回有效的 batch SHA-256。`);
  }
}

async function callBatch(options, input) {
  return options.useHttp
    ? callSpacetimeProcedure(options, PROCEDURE_NAME, input)
    : callSpacetimeProcedureViaCli(options, PROCEDURE_NAME, input);
}

export async function scanScopes(
  options,
  { apply = false, verifyZero = false, callProcedure = callBatch } = {},
) {
  const summaries = [];
  for (const scope of SCOPES) {
    let cursor = null;
    const seenCursors = new Set();
    const summary = {
      scope,
      scanned_count: 0,
      matched_count: 0,
      updated_count: 0,
      batches: 0,
    };
    do {
      const limit = scopeLimit(scope, options.chunkSize);
      const dryRun = await callProcedure(
        options,
        buildNormalizationInput({ scope, cursor, limit, dryRun: true }),
      );
      assertSafeBatch(dryRun, scope);
      summary.scanned_count += dryRun.scanned_count;
      summary.matched_count += dryRun.matched_count;
      summary.batches += 1;

      if (verifyZero && dryRun.matched_count !== 0) {
        throw new Error(
          `${scope} scope apply 后复核仍有 ${dryRun.matched_count} 行待规范化。`,
        );
      }
      if (apply && dryRun.matched_count > 0) {
        const applied = await callProcedure(
          options,
          buildNormalizationInput({
            scope,
            cursor,
            limit,
            dryRun: false,
            expectedBatchSha256: dryRun.batch_sha256,
          }),
        );
        assertSafeBatch(applied, scope);
        if (applied.batch_sha256 !== dryRun.batch_sha256) {
          throw new Error(
            `${scope} scope apply 返回的 batch SHA-256 与 dry-run 不一致。`,
          );
        }
        if (applied.updated_count !== dryRun.matched_count) {
          throw new Error(
            `${scope} scope apply 更新 ${applied.updated_count} 行，dry-run 匹配 ${dryRun.matched_count} 行。`,
          );
        }
        summary.updated_count += applied.updated_count;
      }
      const nextCursor = dryRun.has_more ? dryRun.next_cursor : null;
      if (dryRun.has_more && !nextCursor) {
        throw new Error(`${scope} scope 声明 has_more 但未返回 next_cursor。`);
      }
      if (nextCursor && seenCursors.has(nextCursor)) {
        throw new Error(
          `${scope} scope 返回了重复的 next_cursor: ${nextCursor}。`,
        );
      }
      if (nextCursor) {
        seenCursors.add(nextCursor);
      }
      cursor = nextCursor;
    } while (cursor);
    summaries.push(summary);
  }
  return summaries;
}

export async function main(argv = process.argv.slice(2)) {
  const options = parseOptions(argv);
  if (options.help) {
    console.log(usage());
    return;
  }
  if (!options.database) {
    throw new Error('必须显式传入 --database。');
  }
  if (!options.server && !options.serverUrl) {
    throw new Error(
      '必须显式传入 --server / --server-url，不使用默认 cloud target。',
    );
  }
  if (options.useHttp && !options.token) {
    throw new Error(
      '--use-http 需要通过 --token 或 GENARRATIVE_SPACETIME_TOKEN 提供身份。',
    );
  }

  const migration = await scanScopes(options, { apply: options.apply });
  const verification = options.apply
    ? await scanScopes(options, { verifyZero: true })
    : null;
  console.log(
    JSON.stringify(
      {
        procedure: PROCEDURE_NAME,
        applied: options.apply,
        scope_order: SCOPES,
        migration,
        verification,
      },
      null,
      2,
    ),
  );
  if (!options.apply) {
    console.log('全量 dry-run 已通过；确认输出后追加 --apply 重跑。');
  }
}

if (import.meta.url === pathToFileURL(process.argv[1] || '').href) {
  main().catch((error) => {
    console.error(
      `[spacetime:editor-character-actions:normalize] ${
        error instanceof Error ? error.message : String(error)
      }`,
    );
    process.exitCode = 1;
  });
}