/**
 * One-time seed for Parsian (clientCode=8) Tehran branches + field experts.
 *
 * Usage (before starting the app):
 *   npm run seed:parsian-tehran
 *
 * Optional env:
 *   SEED_FIELD_EXPERT_DEFAULT_PASSWORD=Parsian@724
 */
import { readFileSync, existsSync } from "node:fs";
import { join } from "node:path";
import * as crypto from "node:crypto";
import mongoose, { Schema, Types } from "mongoose";

type BranchSeed = {
  code: string;
  name: string;
  fullName?: string;
  city: string;
  state: string;
  address: string;
  phoneNumber?: string;
  isActive?: boolean;
};

type FieldExpertSeed = {
  nationalCode: string;
  mobile?: string;
  firstName: string;
  lastName: string;
  branchCode: string;
  branchName?: string;
  city?: string;
  state?: string;
  title?: string;
};

function stripQuotes(value: string): string {
  const trimmed = value.trim();
  if (
    (trimmed.startsWith("'") && trimmed.endsWith("'")) ||
    (trimmed.startsWith('"') && trimmed.endsWith('"'))
  ) {
    return trimmed.slice(1, -1);
  }
  return trimmed;
}

function stripInlineComment(value: string): string {
  const hashIdx = value.indexOf(" #");
  return hashIdx === -1 ? value : value.slice(0, hashIdx).trim();
}

function expandEnvValue(value: string, env: NodeJS.ProcessEnv): string {
  return value.replace(/\$\{([^}]+)\}/g, (_, key: string) => env[key] ?? "");
}

function loadEnvFile() {
  const envPath = join(process.cwd(), ".env");
  if (!existsSync(envPath)) return;

  const raw: Record<string, string> = {};
  for (const line of readFileSync(envPath, "utf8").split("\n")) {
    const trimmed = line.trim();
    if (!trimmed || trimmed.startsWith("#")) continue;
    const idx = trimmed.indexOf("=");
    if (idx === -1) continue;
    const key = trimmed.slice(0, idx).trim();
    const value = stripInlineComment(trimmed.slice(idx + 1).trim());
    raw[key] = value;
  }

  for (const [key, value] of Object.entries(raw)) {
    if (process.env[key]) continue;
    process.env[key] = stripQuotes(value);
  }

  // Expand ${VAR} placeholders (same as Nest ConfigModule expandVariables).
  for (let pass = 0; pass < 5; pass++) {
    let changed = false;
    for (const key of Object.keys(process.env)) {
      const current = process.env[key];
      if (!current || !current.includes("${")) continue;
      const expanded = expandEnvValue(stripQuotes(current), process.env);
      if (expanded !== current) {
        process.env[key] = expanded;
        changed = true;
      }
    }
    if (!changed) break;
  }

  for (const key of Object.keys(process.env)) {
    const value = process.env[key];
    if (value) process.env[key] = stripQuotes(value);
  }
}

function resolveMongoUri(): string {
  const uri = process.env.MONGO_URI?.trim();
  if (!uri) {
    throw new Error("MONGO_URI is not set in .env");
  }
  if (!uri.startsWith("mongodb://") && !uri.startsWith("mongodb+srv://")) {
    throw new Error(
      `Invalid MONGO_URI after env expansion: "${uri.slice(0, 40)}..."`,
    );
  }
  return uri;
}

async function ensureFieldExpertIndexes(collection: mongoose.Collection) {
  const indexes = await collection.indexes();
  const emailIndex = indexes.find((idx) => idx.key?.email === 1);
  if (emailIndex && !emailIndex.sparse) {
    await collection.dropIndex(emailIndex.name);
    console.log(`Dropped legacy non-sparse index: ${emailIndex.name}`);
  }
  await collection.createIndex({ email: 1 }, { unique: true, sparse: true });
  await collection.createIndex(
    { clientKey: 1, nationalCode: 1 },
    { unique: true, sparse: true },
  );
}

function hashPassword(password: string): Promise<string> {
  return new Promise((resolve, reject) => {
    const salt = crypto.randomBytes(16).toString("hex");
    crypto.scrypt(password, salt, 64, (err, derivedKey) => {
      if (err) reject(err);
      resolve(`${salt}:${derivedKey.toString("hex")}`);
    });
  });
}

const ClientSchema = new Schema(
  {
    clientName: { type: Object, required: true },
    clientCode: { type: Number, required: true },
    useExpertMode: { type: String, required: true },
  },
  { collection: "clients", versionKey: false },
);

const BranchSchema = new Schema(
  {
    clientKey: { type: Schema.Types.ObjectId, required: true, index: true },
    name: { type: String, required: true },
    code: { type: String, required: true },
    city: { type: String, required: true },
    state: { type: String, required: true },
    address: { type: String, required: true },
    phoneNumber: { type: String },
    isActive: { type: Boolean, default: true },
  },
  { collection: "branches", versionKey: false, timestamps: true },
);

BranchSchema.index({ clientKey: 1, code: 1 }, { unique: true });

const FieldExpertSchema = new Schema(
  {
    firstName: { type: String, required: true },
    lastName: { type: String, required: true },
    email: { type: String, unique: true, sparse: true },
    username: { type: String },
    nationalCode: { type: String, index: true, sparse: true },
    clientKey: { type: Schema.Types.ObjectId, index: true },
    branchId: { type: Schema.Types.ObjectId, index: true },
    password: { type: String, required: true },
    mobile: { type: String },
    phone: { type: String },
    role: { type: String, default: "field_expert" },
    otp: { type: String, default: "" },
  },
  { collection: "field-expert", versionKey: false, timestamps: true },
);

FieldExpertSchema.index(
  { clientKey: 1, nationalCode: 1 },
  { unique: true, sparse: true },
);

async function main() {
  loadEnvFile();
  const mongoUri = resolveMongoUri();

  const dataDir = join(process.cwd(), "scripts/data/parsian-tehran");
  const branchesFile = JSON.parse(
    readFileSync(join(dataDir, "branches.json"), "utf8"),
  ) as { clientCode: number; branches: BranchSeed[] };
  const expertsFile = JSON.parse(
    readFileSync(join(dataDir, "field-experts.json"), "utf8"),
  ) as { clientCode: number; fieldExperts: FieldExpertSeed[] };

  const defaultPassword =
    process.env.SEED_FIELD_EXPERT_DEFAULT_PASSWORD ?? "123321";
  const hashedPassword = await hashPassword(defaultPassword);

  await mongoose.connect(mongoUri, {
    tls: process.env.MONGO_TLS === "true",
    tlsAllowInvalidCertificates:
      process.env.MONGO_TLS_ALLOW_INVALID_CERTS === "true",
  });
  const Client = mongoose.model("ClientSeedClient", ClientSchema);
  const Branch = mongoose.model("ClientSeedBranch", BranchSchema);
  const FieldExpert = mongoose.model("ClientSeedFieldExpert", FieldExpertSchema);

  await ensureFieldExpertIndexes(FieldExpert.collection);

  const client = await Client.findOne({
    clientCode: branchesFile.clientCode,
  }).lean();
  if (!client?._id) {
    throw new Error(
      `Client with clientCode=${branchesFile.clientCode} not found in database`,
    );
  }
  const clientKey = new Types.ObjectId(String(client._id));

  const branchIdByCode = new Map<string, Types.ObjectId>();
  let branchesCreated = 0;
  let branchesUpdated = 0;

  for (const branch of branchesFile.branches) {
    const existing = await Branch.findOne({
      clientKey,
      code: branch.code,
    });
    const payload = {
      clientKey,
      name: branch.name,
      code: branch.code,
      city: branch.city,
      state: branch.state,
      address: branch.address,
      phoneNumber: branch.phoneNumber,
      isActive: branch.isActive ?? true,
    };
    if (existing) {
      await Branch.updateOne({ _id: existing._id }, { $set: payload });
      branchIdByCode.set(branch.code, existing._id as Types.ObjectId);
      branchesUpdated++;
    } else {
      const created = await Branch.create(payload);
      branchIdByCode.set(branch.code, created._id as Types.ObjectId);
      branchesCreated++;
    }
  }

  let expertsCreated = 0;
  let expertsUpdated = 0;
  let expertsSkipped = 0;

  for (const expert of expertsFile.fieldExperts) {
    const branchId = branchIdByCode.get(expert.branchCode);
    if (!branchId) {
      console.warn(
        `Skipping ${expert.nationalCode}: unknown branch ${expert.branchCode}`,
      );
      expertsSkipped++;
      continue;
    }

    const payload = {
      firstName: expert.firstName,
      lastName: expert.lastName,
      username: expert.nationalCode,
      nationalCode: expert.nationalCode,
      clientKey,
      branchId,
      password: hashedPassword,
      mobile: expert.mobile,
      role: "field_expert",
      otp: "",
    };

    const existing = await FieldExpert.findOne({
      clientKey,
      nationalCode: expert.nationalCode,
    });

    if (existing) {
      await FieldExpert.updateOne(
        { _id: existing._id },
        {
          $set: {
            ...payload,
            // Do not rotate password on re-seed unless explicitly desired.
            password: existing.password,
          },
        },
      );
      expertsUpdated++;
    } else {
      await FieldExpert.create(payload);
      expertsCreated++;
    }
  }

  console.log("Parsian Tehran seed completed.");
  console.log({
    clientCode: branchesFile.clientCode,
    clientKey: String(clientKey),
    branchesCreated,
    branchesUpdated,
    expertsCreated,
    expertsUpdated,
    expertsSkipped,
    defaultPassword,
    loginHint: "Use nationalCode + password on POST /actor/login with role field_expert",
  });

  await mongoose.disconnect();
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});