import { existsSync, readFileSync } from "node:fs";
import { mkdir, readFile, writeFile } from "node:fs/promises";
import { join } from "node:path";
import { randomBytes, scryptSync } from "node:crypto";
import { createClient } from "@supabase/supabase-js";

loadEnvFile(".env");
loadEnvFile(".env.local");

const inputPath = process.argv[2];
if (!inputPath) fail("用法：npm run migrate:accounts -- path/to/legacy-accounts.json");

const input = JSON.parse(await readFile(inputPath, "utf8"));
const accounts = Array.isArray(input.accounts) ? input.accounts : [];
if (!accounts.length) fail("迁移文件中的 accounts 不能为空。");
const organizations = Array.isArray(input.organizations) ? input.organizations : [];
const supabase = getSupabase();

if (supabase) {
  await migrateSupabase(accounts, organizations, supabase);
} else {
  await migrateLocal(accounts, organizations);
}

console.log(`已迁移 ${accounts.length} 个账号及其历史归属。`);

async function migrateSupabase(accounts, organizations, supabase) {
  for (const organization of organizations) {
    if (!organization?.id || !organization?.name) continue;
    const { error } = await supabase.from("platform_organizations").upsert({
      id: String(organization.id),
      name: String(organization.name),
      status: organization.status === "disabled" ? "disabled" : "active",
      archive_owner_id: `archive:${organization.id}`
    }, { onConflict: "id" });
    if (error) fail(error.message);
  }
  for (const account of accounts) {
    const record = normalizeAccount(account);
    const { data: existing, error: lookupError } = await supabase.from("platform_users").select("id").eq("phone", record.phone).maybeSingle();
    if (lookupError) fail(lookupError.message);
    const userId = existing?.id || `user_${randomBytes(8).toString("hex")}`;
    const credential = hashPassword(record.password);
    const now = new Date().toISOString();
    const { error: userError } = await supabase.from("platform_users").upsert({
      id: userId,
      phone: record.phone,
      display_name: record.displayName,
      role: record.role,
      organization_id: record.organizationId || null,
      status: "active",
      password_hash: credential.hash,
      password_salt: credential.salt,
      failed_login_count: 0,
      locked_until: null,
      session_version: 1,
      legacy_subject: record.legacyOwnerId,
      updated_at: now
    }, { onConflict: "id" });
    if (userError) fail(userError.message);
    await reassignSupabaseOwner(supabase, record.legacyOwnerId, userId, record);
    const { error: mappingError } = await supabase.from("platform_account_migrations").upsert({
      id: `migration_${randomBytes(8).toString("hex")}`,
      legacy_owner_id: record.legacyOwnerId,
      legacy_phone: record.phone,
      platform_user_id: userId
    }, { onConflict: "legacy_owner_id" });
    if (mappingError) fail(mappingError.message);
  }
}

async function reassignSupabaseOwner(supabase, legacyOwnerId, userId, account) {
  for (const table of ["assets", "generation_jobs", "projects", "image_templates"] ) {
    const { error } = await supabase.from(table).update({ owner_id: userId }).eq("owner_id", legacyOwnerId);
    if (error) fail(error.message);
  }
  const usagePatch = {
    owner_id: userId,
    account_username: account.phone,
    account_display_name: account.displayName,
    organization_id: account.organizationId || null
  };
  const { error } = await supabase.from("usage_events").update(usagePatch).eq("owner_id", legacyOwnerId);
  if (error) fail(error.message);
}

async function migrateLocal(accounts, organizations) {
  const dataDirectory = process.env.ZHINIAN_DATA_DIR || join(process.cwd(), ".runtime", "data");
  await mkdir(dataDirectory, { recursive: true });
  const path = join(dataDirectory, "platform-accounts.json");
  const state = await readState(path);
  const now = new Date().toISOString();
  for (const organization of organizations) {
    if (!organization?.id || !organization?.name) continue;
    const next = {
      id: String(organization.id),
      name: String(organization.name),
      status: organization.status === "disabled" ? "disabled" : "active",
      archiveOwnerId: `archive:${organization.id}`,
      createdAt: now,
      updatedAt: now
    };
    const index = state.organizations.findIndex((item) => item.id === next.id);
    if (index >= 0) state.organizations[index] = { ...state.organizations[index], ...next };
    else state.organizations.push(next);
  }
  for (const account of accounts) {
    const record = normalizeAccount(account);
    const credential = hashPassword(record.password);
    let user = state.users.find((item) => item.phone === record.phone);
    if (!user) {
      user = {
        id: `user_${randomBytes(8).toString("hex")}`,
        phone: record.phone,
        displayName: record.displayName,
        role: record.role,
        organizationId: record.organizationId,
        status: "active",
        failedLoginCount: 0,
        sessionVersion: 1,
        createdAt: now,
        updatedAt: now
      };
      state.users.push(user);
    }
    Object.assign(user, {
      displayName: record.displayName,
      role: record.role,
      organizationId: record.organizationId,
      status: "active",
      passwordHash: credential.hash,
      passwordSalt: credential.salt,
      failedLoginCount: 0,
      lockedUntil: undefined,
      sessionVersion: (user.sessionVersion || 1) + 1,
      legacySubject: record.legacyOwnerId,
      updatedAt: now
    });
    reassignLocalOwner(state, record.legacyOwnerId, user.id, record);
    const migration = {
      id: `migration_${randomBytes(8).toString("hex")}`,
      legacyOwnerId: record.legacyOwnerId,
      legacyPhone: record.phone,
      platformUserId: user.id,
      createdAt: now
    };
    const mappingIndex = state.migrations.findIndex((item) => item.legacyOwnerId === record.legacyOwnerId);
    if (mappingIndex >= 0) state.migrations[mappingIndex] = migration;
    else state.migrations.push(migration);
  }
  await writeFile(path, JSON.stringify(state, null, 2));
}

function reassignLocalOwner(state, legacyOwnerId, userId, account) {
  for (const collection of [state.assets, state.generationJobs, state.projects, state.imageTemplates]) {
    for (const item of collection) if (item.ownerId === legacyOwnerId) item.ownerId = userId;
  }
  for (const event of state.usageEvents) {
    if (event.ownerId !== legacyOwnerId) continue;
    event.ownerId = userId;
    event.accountUsername = account.phone;
    event.accountDisplayName = account.displayName;
    event.organizationId = account.organizationId;
  }
}

function normalizeAccount(account) {
  if (!account?.legacyOwnerId || !account?.phone || !account?.password || !account?.displayName) {
    fail("每个账号必须提供 legacyOwnerId、phone、displayName 和 password。");
  }
  const phone = String(account.phone).trim().replace(/[\s()-]/g, "");
  if (!/^\+?[0-9]{6,20}$/.test(phone)) fail(`手机号格式不正确：${phone}`);
  const role = account.role === "super_admin" || account.role === "organization_admin" ? account.role : "user";
  if (role !== "super_admin" && !account.organizationId) fail(`普通账号缺少 organizationId：${phone}`);
  return {
    legacyOwnerId: String(account.legacyOwnerId),
    phone,
    displayName: String(account.displayName).trim(),
    password: String(account.password),
    role,
    organizationId: account.organizationId ? String(account.organizationId) : undefined
  };
}

function hashPassword(value) {
  const salt = randomBytes(16).toString("hex");
  return { salt, hash: scryptSync(value, salt, 64).toString("hex") };
}

function getSupabase() {
  const url = process.env.NEXT_PUBLIC_SUPABASE_URL;
  const key = process.env.SUPABASE_SERVICE_ROLE_KEY;
  return url && key ? createClient(url, key, { auth: { persistSession: false } }) : null;
}

function loadEnvFile(path) {
  if (!existsSync(path)) return;
  for (const line of readFileSync(path, "utf8").split(/\r?\n/)) {
    const match = line.match(/^\s*([A-Z][A-Z0-9_]*)\s*=\s*(.*)\s*$/);
    if (!match || process.env[match[1]]) continue;
    process.env[match[1]] = match[2].replace(/^['"]|['"]$/g, "");
  }
}

function fail(message) {
  console.error(`迁移失败：${message}`);
  process.exit(1);
}

async function readState(path) {
  try {
    const raw = JSON.parse(await readFile(path, "utf8"));
    return {
      users: Array.isArray(raw.users) ? raw.users : [],
      organizations: Array.isArray(raw.organizations) ? raw.organizations : [],
      migrations: Array.isArray(raw.migrations) ? raw.migrations : [],
      assets: Array.isArray(raw.assets) ? raw.assets : [],
      generationJobs: Array.isArray(raw.generationJobs) ? raw.generationJobs : [],
      usageEvents: Array.isArray(raw.usageEvents) ? raw.usageEvents : [],
      projects: Array.isArray(raw.projects) ? raw.projects : [],
      imageTemplates: Array.isArray(raw.imageTemplates) ? raw.imageTemplates : []
    };
  } catch {
    return { users: [], organizations: [], migrations: [], assets: [], generationJobs: [], usageEvents: [], projects: [], imageTemplates: [] };
  }
}