import app from "./app";
import { logger } from "./lib/logger";
import bcrypt from "bcryptjs";
import { db, usersTable, toolsTable } from "@workspace/db";
import { sql } from "drizzle-orm";

const rawPort = process.env["PORT"];

if (!rawPort) {
  throw new Error(
    "PORT environment variable is required but was not provided.",
  );
}

const port = Number(rawPort);

if (Number.isNaN(port) || port <= 0) {
  throw new Error(`Invalid PORT value: "${rawPort}"`);
}

async function ensureSessionsTable(): Promise<void> {
  try {
    const exists = await db.execute(
      sql`SELECT EXISTS (SELECT FROM information_schema.tables WHERE table_name = 'sessions')`,
    );
    const rows = exists.rows as [{ exists: boolean }];
    if (rows[0]?.exists) return;

    await db.execute(
      sql`CREATE TABLE "sessions" ("sid" varchar NOT NULL, "sess" json NOT NULL, "expire" timestamp(6) NOT NULL)`,
    );
    await db.execute(
      sql`ALTER TABLE "sessions" ADD PRIMARY KEY ("sid")`,
    );
    logger.info("Sessions table created");
  } catch (err) {
    logger.error({ err }, "Failed to ensure sessions table");
  }
}

async function seedAdminUser(): Promise<void> {
  try {
    const [row] = await db.select({ count: sql<number>`count(*)::int` }).from(usersTable);
    if ((row?.count ?? 0) > 0) return;

    const adminUsername = process.env.LOCAL_ADMIN_USERNAME || "admin";
    const adminPassword = process.env.LOCAL_ADMIN_PASSWORD;
    if (!adminPassword) {
      logger.warn("LOCAL_ADMIN_PASSWORD is not set — skipping admin seed. Set it to enable local login.");
      return;
    }

    const passwordHash = await bcrypt.hash(adminPassword, 10);
    await db.insert(usersTable).values({
      username: adminUsername,
      passwordHash,
      role: "admin",
      tier: "enterprise",
    });
    logger.info({ username: adminUsername }, "Admin user created");
  } catch (err) {
    logger.error({ err }, "Failed to seed admin user");
  }
}

async function ensureToolRelationsTable(): Promise<void> {
  try {
    const exists = await db.execute(
      sql`SELECT EXISTS (SELECT FROM information_schema.tables WHERE table_name = 'tool_relations')`,
    );
    const rows = exists.rows as [{ exists: boolean }];
    if (rows[0]?.exists) return;

    await db.execute(
      sql`CREATE TABLE "tool_relations" ("id" serial NOT NULL, "tool_id" integer NOT NULL REFERENCES "tools"("id") ON DELETE CASCADE, "related_tool_id" integer NOT NULL REFERENCES "tools"("id") ON DELETE CASCADE, "relation_type" text NOT NULL DEFAULT 'similar', "notes" text, "created_by" integer REFERENCES "users"("id"), "created_at" timestamp with time zone NOT NULL DEFAULT NOW())`,
    );
    await db.execute(sql`ALTER TABLE "tool_relations" ADD PRIMARY KEY ("id")`);
    logger.info("tool_relations table created");
  } catch (err) {
    logger.error({ err }, "Failed to ensure tool_relations table");
  }
}

async function ensureUserColumns(): Promise<void> {
  try {
    const rows = (await db.execute(
      sql`SELECT column_name, is_nullable FROM information_schema.columns WHERE table_name = 'users'`,
    )).rows as { column_name: string; is_nullable: string }[];
    const existing = new Map(rows.map((r) => [r.column_name, r.is_nullable]));

    if (!existing.has("tier")) {
      await db.execute(sql`ALTER TABLE "users" ADD COLUMN "tier" text NOT NULL DEFAULT 'free'`);
      logger.info("Added column: tier");
    }
    if (!existing.has("auth_provider")) {
      await db.execute(sql`ALTER TABLE "users" ADD COLUMN "auth_provider" text NOT NULL DEFAULT 'local'`);
      logger.info("Added column: auth_provider");
    }
    if (!existing.has("auth_provider_id")) {
      await db.execute(sql`ALTER TABLE "users" ADD COLUMN "auth_provider_id" text`);
      logger.info("Added column: auth_provider_id");
    }
    if (!existing.has("display_name")) {
      await db.execute(sql`ALTER TABLE "users" ADD COLUMN "display_name" text`);
      logger.info("Added column: display_name");
    }
    if (!existing.has("password_hash")) {
      await db.execute(sql`ALTER TABLE "users" ADD COLUMN "password_hash" text`);
      logger.info("Added column: password_hash");
    } else if (existing.get("password_hash") === "NO") {
      await db.execute(sql`ALTER TABLE "users" ALTER COLUMN "password_hash" DROP NOT NULL`);
      logger.info("Made password_hash nullable");
    }
  } catch (err) {
    logger.error({ err }, "Failed to ensure user columns");
  }
}

async function ensureToolCostsTable(): Promise<void> {
  try {
    const exists = await db.execute(
      sql`SELECT EXISTS (SELECT FROM information_schema.tables WHERE table_name = 'tool_costs')`,
    );
    const rows = exists.rows as [{ exists: boolean }];
    if (rows[0]?.exists) return;

    await db.execute(
      sql`CREATE TABLE "tool_costs" ("id" serial NOT NULL, "tool_id" integer NOT NULL REFERENCES "tools"("id") ON DELETE CASCADE, "license_type" text NOT NULL DEFAULT 'free', "cost" numeric(10,2), "currency" text DEFAULT 'EUR', "renewal_date" timestamp with time zone, "notes" text, "created_by" integer REFERENCES "users"("id"), "created_at" timestamp with time zone NOT NULL DEFAULT NOW())`,
    );
    await db.execute(sql`ALTER TABLE "tool_costs" ADD PRIMARY KEY ("id")`);
    logger.info("tool_costs table created");
  } catch (err) {
    logger.error({ err }, "Failed to ensure tool_costs table");
  }
}

async function ensureVoterTokenColumn(): Promise<void> {
  try {
    const exists = await db.execute(
      sql`SELECT EXISTS (SELECT FROM information_schema.columns WHERE table_name = 'ratings' AND column_name = 'voter_token')`,
    );
    const rows = exists.rows as [{ exists: boolean }];
    if (rows[0]?.exists) return;

    await db.execute(sql`ALTER TABLE "ratings" ADD COLUMN "voter_token" text`);
    logger.info("voter_token column added to ratings");
  } catch (err) {
    logger.error({ err }, "Failed to add voter_token column");
  }
}

async function ensureBillingPeriodColumn(): Promise<void> {
  try {
    const exists = await db.execute(
      sql`SELECT EXISTS (SELECT FROM information_schema.columns WHERE table_name = 'tool_costs' AND column_name = 'billing_period')`,
    );
    const rows = exists.rows as [{ exists: boolean }];
    if (rows[0]?.exists) return;
    await db.execute(sql`ALTER TABLE "tool_costs" ADD COLUMN "billing_period" text`);
    logger.info("billing_period column added to tool_costs");
  } catch (err) {
    logger.error({ err }, "Failed to add billing_period column");
  }
}

async function ensureAdminTier(): Promise<void> {
  try {
    const result = await db
      .update(usersTable)
      .set({ tier: "enterprise" })
      .where(sql`role = 'admin' AND (tier IS NULL OR tier = 'free')`)
      .returning({ id: usersTable.id, username: usersTable.username });
    if (result.length > 0) {
      logger.info({ count: result.length }, "Admin users upgraded to enterprise tier");
    }
  } catch (err) {
    logger.error({ err }, "Failed to upgrade admin tier");
  }
}

async function purgeTrash(): Promise<void> {
  const retentionDays = Number(process.env["TRASH_RETENTION_DAYS"] ?? "0");
  if (!Number.isFinite(retentionDays) || retentionDays <= 0) return;
  try {
    const cutoff = new Date(Date.now() - retentionDays * 24 * 60 * 60 * 1000);
    const result = await db
      .delete(toolsTable)
      .where(sql`${toolsTable.deletedAt} IS NOT NULL AND ${toolsTable.deletedAt} < ${cutoff}`)
      .returning({ id: toolsTable.id });
    if (result.length > 0) {
      logger.info({ count: result.length }, "Purged expired trash entries");
    }
  } catch (err) {
    logger.error({ err }, "Failed to purge trash");
  }
}

async function start(): Promise<void> {
  await ensureSessionsTable();
  await ensureToolRelationsTable();
  await ensureToolCostsTable();
  await ensureVoterTokenColumn();
  await ensureBillingPeriodColumn();
  await ensureUserColumns();
  await seedAdminUser();
  await ensureAdminTier();
  await purgeTrash();

  const retentionDays = Number(process.env["TRASH_RETENTION_DAYS"] ?? "0");
  if (Number.isFinite(retentionDays) && retentionDays > 0) {
    setInterval(() => {
      void purgeTrash();
    }, 60 * 60 * 1000);
    logger.info({ retentionDays }, "Trash auto-purge enabled");
  }

  app.listen(port, (err) => {
    if (err) {
      logger.error({ err }, "Error listening on port");
      process.exit(1);
    }
    logger.info({ port }, "Server listening");
  });
}
start().catch((err) => {
  logger.error({ err }, "Server startup failed");
  process.exit(1);
});