import { sql } from "drizzle-orm";
import { sqliteTable, text, integer } from "drizzle-orm/sqlite-core";
import crypto from "node:crypto";

const id = () =>
  text("id")
    .primaryKey()
    .$defaultFn(() => crypto.randomUUID());

const timestamps = {
  createdAt: integer("created_at", { mode: "timestamp_ms" })
    .notNull()
    .default(sql`(unixepoch('subsec') * 1000)`),
  updatedAt: integer("updated_at", { mode: "timestamp_ms" })
    .notNull()
    .default(sql`(unixepoch('subsec') * 1000)`),
};

/** Agents and admins — the people who work tickets. */
export const users = sqliteTable("users", {
  id: id(),
  email: text("email").notNull().unique(),
  passwordHash: text("password_hash").notNull(),
  name: text("name").notNull(),
  role: text("role", { enum: ["admin", "agent"] })
    .notNull()
    .default("agent"),
  createdAt: timestamps.createdAt,
});

export const sessions = sqliteTable("sessions", {
  // primary key is the SHA-256 hash of the raw session token — the raw
  // token only ever lives in the client's httpOnly cookie.
  tokenHash: text("token_hash").primaryKey(),
  userId: text("user_id")
    .notNull()
    .references(() => users.id, { onDelete: "cascade" }),
  expiresAt: integer("expires_at", { mode: "timestamp_ms" }).notNull(),
  createdAt: timestamps.createdAt,
});

/** People who file tickets — identified by whichever channel they came in on. */
export const customers = sqliteTable("customers", {
  id: id(),
  displayName: text("display_name").notNull(),
  email: text("email"),
  telegramChatId: text("telegram_chat_id").unique(),
  // Bearer token embedded in the customer's portal link — long, random,
  // unguessable. Grants access to only this customer's tickets.
  portalToken: text("portal_token")
    .notNull()
    .unique()
    .$defaultFn(() => crypto.randomBytes(32).toString("base64url")),
  createdAt: timestamps.createdAt,
});

export const tickets = sqliteTable("tickets", {
  id: id(),
  subject: text("subject").notNull(),
  status: text("status", { enum: ["new", "open", "pending", "closed"] })
    .notNull()
    .default("new"),
  priority: text("priority", { enum: ["low", "normal", "high", "urgent"] })
    .notNull()
    .default("normal"),
  channel: text("channel", { enum: ["telegram", "portal", "manual", "email", "widget"] }).notNull(),
  customerId: text("customer_id")
    .notNull()
    .references(() => customers.id, { onDelete: "cascade" }),
  assigneeId: text("assignee_id").references(() => users.id, { onDelete: "set null" }),
  lastMessageAt: integer("last_message_at", { mode: "timestamp_ms" })
    .notNull()
    .default(sql`(unixepoch('subsec') * 1000)`),
  ...timestamps,
});

export const messages = sqliteTable("messages", {
  id: id(),
  ticketId: text("ticket_id")
    .notNull()
    .references(() => tickets.id, { onDelete: "cascade" }),
  authorType: text("author_type", { enum: ["customer", "agent", "system"] }).notNull(),
  // References customers.id or users.id depending on authorType; null for system messages.
  authorId: text("author_id"),
  authorName: text("author_name").notNull(),
  body: text("body").notNull(),
  direction: text("direction", { enum: ["in", "out"] }).notNull(),
  // RFC 5322 Message-ID of this email, when the message came in/out over the
  // email channel — lets a customer's future reply be matched back to the
  // exact ticket via In-Reply-To/References, even if they have other tickets.
  emailMessageId: text("email_message_id"),
  createdAt: timestamps.createdAt,
});

/** Single-row-ish config for the Telegram channel (one bot per deployment). */
export const telegramConfig = sqliteTable("telegram_config", {
  id: id(),
  botTokenEnc: text("bot_token_enc").notNull(),
  botUsername: text("bot_username"),
  enabled: integer("enabled", { mode: "boolean" }).notNull().default(false),
  verifiedAt: integer("verified_at", { mode: "timestamp_ms" }),
  createdAt: timestamps.createdAt,
});

/** Single-row-ish config for the email channel (one support mailbox per deployment). */
export const mailboxConfig = sqliteTable("mailbox_config", {
  id: id(),
  imapHost: text("imap_host").notNull(),
  imapPort: integer("imap_port").notNull().default(993),
  smtpHost: text("smtp_host").notNull(),
  smtpPort: integer("smtp_port").notNull().default(587),
  user: text("user").notNull(),
  passwordEnc: text("password_enc").notNull(),
  // Both IMAP and SMTP presented an expired cert on support@top-sysops.ru at
  // setup time. This is a LAN-only mailbox (never exposed to the internet),
  // so skipping verification is an accepted risk — not a default for
  // arbitrary/public mail servers. Revisit once the cert is renewed.
  allowInsecureTls: integer("allow_insecure_tls", { mode: "boolean" }).notNull().default(false),
  enabled: integer("enabled", { mode: "boolean" }).notNull().default(false),
  verifiedAt: integer("verified_at", { mode: "timestamp_ms" }),
  createdAt: timestamps.createdAt,
});

/** A site the chat widget is embedded on. Public, non-secret identifier — labels ticket origin, not a trust boundary. */
export const widgetSites = sqliteTable("widget_sites", {
  id: id(),
  siteKey: text("site_key")
    .notNull()
    .unique()
    .$defaultFn(() => crypto.randomBytes(12).toString("base64url")),
  name: text("name").notNull(),
  allowedOrigin: text("allowed_origin"),
  enabled: integer("enabled", { mode: "boolean" }).notNull().default(true),
  createdAt: timestamps.createdAt,
});