import { Injectable } from '@nestjs/common';
import { DatabaseService } from '../../../infra/database/database.service';

@Injectable()
export class AttendanceAssignmentRepository {
  constructor(private readonly database: DatabaseService) {}

  assignChat(chatId: string, userId: number, areaId?: number | null) {
    return this.database.query(
      `
        INSERT INTO whatsapp_chat_atribuicoes (
          chat_id, user_id, area_id, status, conversation_started_at, expires_at, assigned_at, updated_at
        )
        VALUES ($1, $2, $3, 'assigned', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP + INTERVAL '24 hours', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)
        ON CONFLICT (chat_id) DO UPDATE SET
          user_id = EXCLUDED.user_id,
          area_id = COALESCE(EXCLUDED.area_id, whatsapp_chat_atribuicoes.area_id),
          status = 'assigned',
          awaiting_customer_reply = FALSE,
          reserved_user_id = NULL,
          reserved_at = NULL,
          pause_released_at = NULL,
          triage_flow_id = NULL,
          triage_audience_id = NULL,
          triage_intent_id = NULL,
          triage_step = NULL,
          triage_builder_version_id = NULL,
          triage_builder_node_id = NULL,
          assigned_at = CURRENT_TIMESTAMP,
          updated_at = CURRENT_TIMESTAMP
        RETURNING *;
      `,
      [chatId, userId, areaId || null],
    );
  }

  queueChat(chatId: string, areaId: number, note?: string | null) {
    return this.database.query(
      `
        INSERT INTO whatsapp_chat_atribuicoes (
          chat_id, user_id, area_id, status, conversation_started_at, expires_at, transfer_note, assigned_at, updated_at
        )
        VALUES ($1, NULL, $2, 'queued', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP + INTERVAL '24 hours', $3, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)
        ON CONFLICT (chat_id) DO UPDATE SET
          user_id = NULL,
          area_id = EXCLUDED.area_id,
          status = 'queued',
          reserved_user_id = NULL,
          reserved_at = NULL,
          pause_released_at = NULL,
          conversation_started_at = CASE
            WHEN whatsapp_chat_atribuicoes.expires_at <= CURRENT_TIMESTAMP THEN CURRENT_TIMESTAMP
            ELSE whatsapp_chat_atribuicoes.conversation_started_at
          END,
          expires_at = CASE
            WHEN whatsapp_chat_atribuicoes.expires_at <= CURRENT_TIMESTAMP THEN CURRENT_TIMESTAMP + INTERVAL '24 hours'
            ELSE whatsapp_chat_atribuicoes.expires_at
          END,
          transfer_note = EXCLUDED.transfer_note,
          triage_flow_id = NULL,
          triage_audience_id = NULL,
          triage_intent_id = NULL,
          triage_step = NULL,
          triage_builder_version_id = NULL,
          triage_builder_node_id = NULL,
          updated_at = CURRENT_TIMESTAMP
        RETURNING *;
      `,
      [chatId, areaId, note || null],
    );
  }

  transferChat(input: { chatId: string; userId?: number | null; areaId: number; status: string; note?: string | null }) {
    return this.database.query(
      `
        INSERT INTO whatsapp_chat_atribuicoes (
          chat_id, user_id, area_id, status, conversation_started_at, expires_at, transfer_note, assigned_at, updated_at
        )
        VALUES ($1, $2, $3, $4, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP + INTERVAL '24 hours', $5, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)
        ON CONFLICT (chat_id) DO UPDATE SET
          user_id = EXCLUDED.user_id,
          area_id = EXCLUDED.area_id,
          status = EXCLUDED.status,
          transfer_note = EXCLUDED.transfer_note,
          reserved_user_id = NULL,
          reserved_at = NULL,
          pause_released_at = NULL,
          triage_flow_id = NULL,
          triage_audience_id = NULL,
          triage_intent_id = NULL,
          triage_step = NULL,
          triage_builder_version_id = NULL,
          triage_builder_node_id = NULL,
          assigned_at = CURRENT_TIMESTAMP,
          updated_at = CURRENT_TIMESTAMP
        RETURNING *;
      `,
      [input.chatId, input.userId || null, input.areaId, input.status, input.note || null],
    );
  }

  getAssignment(chatId: string) {
    return this.database.query(
      `
        SELECT * FROM whatsapp_chat_atribuicoes
        WHERE chat_id = $1
        LIMIT 1
      `,
      [chatId],
    );
  }

  expireAssignment(chatId: string) {
    return this.database.query(
      `UPDATE whatsapp_chat_atribuicoes SET status = 'expired', user_id = NULL, updated_at = CURRENT_TIMESTAMP WHERE chat_id = $1`,
      [chatId],
    );
  }

  releaseChat(chatId: string) {
    return this.database.query(
      `
        UPDATE whatsapp_chat_atribuicoes
        SET
          user_id = NULL,
          status = 'queued',
          reserved_user_id = NULL,
          reserved_at = NULL,
          pause_released_at = NULL,
          triage_flow_id = NULL,
          triage_audience_id = NULL,
          triage_intent_id = NULL,
          triage_step = NULL,
          triage_builder_version_id = NULL,
          triage_builder_node_id = NULL,
          updated_at = CURRENT_TIMESTAMP
        WHERE chat_id = $1
        RETURNING *;
      `,
      [chatId],
    );
  }

  closeChat(chatId: string, userId?: string | number | null) {
    const params: Array<string | number | null> = [chatId];
    const userGuard = userId ? 'AND (user_id = $2 OR user_id IS NULL)' : '';
    if (userId) params.push(Number(userId));

    return this.database.query(
      `
        UPDATE whatsapp_chat_atribuicoes
        SET
          user_id = NULL,
          area_id = NULL,
          status = 'expired',
          awaiting_customer_reply = FALSE,
          reserved_user_id = NULL,
          reserved_at = NULL,
          pause_released_at = NULL,
          triage_flow_id = NULL,
          triage_audience_id = NULL,
          triage_intent_id = NULL,
          triage_step = NULL,
          triage_builder_version_id = NULL,
          triage_builder_node_id = NULL,
          transfer_note = NULL,
          updated_at = CURRENT_TIMESTAMP
        WHERE chat_id = $1
          ${userGuard}
        RETURNING *
      `,
      params,
    );
  }

  clearTransferNote(chatId: string) {
    return this.database.query(
      `
        UPDATE whatsapp_chat_atribuicoes
        SET transfer_note = NULL, updated_at = CURRENT_TIMESTAMP
        WHERE chat_id = $1
        RETURNING *
      `,
      [chatId],
    );
  }

  markAwaitingCustomerReply(chatId: string) {
    return this.database.query(
      `
        UPDATE whatsapp_chat_atribuicoes
        SET awaiting_customer_reply = TRUE, updated_at = CURRENT_TIMESTAMP
        WHERE chat_id = $1
        RETURNING *
      `,
      [chatId],
    );
  }

  markCustomerReplied(chatId: string) {
    return this.database.query(
      `
        UPDATE whatsapp_chat_atribuicoes
        SET awaiting_customer_reply = FALSE, updated_at = CURRENT_TIMESTAMP
        WHERE chat_id = $1 AND awaiting_customer_reply = TRUE
        RETURNING *
      `,
      [chatId],
    );
  }

  getChatsByArea(areaId: string) {
    return this.database.query(`SELECT * FROM whatsapp_chat_atribuicoes WHERE area_id = $1 AND status <> 'expired'`, [areaId]);
  }

  getChatsByUser(userId: string) {
    return this.database.query(`SELECT * FROM whatsapp_chat_atribuicoes WHERE user_id = $1 AND status = 'assigned'`, [userId]);
  }

  closeBotConversation(chatId: string, messageId?: string) {
    return this.database.query(
      `
        UPDATE whatsapp_chat_atribuicoes
        SET status = 'expired',
            user_id = NULL,
            area_id = NULL,
            triage_flow_id = NULL,
            triage_audience_id = NULL,
            triage_intent_id = NULL,
            triage_step = NULL,
            triage_builder_version_id = NULL,
            triage_builder_node_id = NULL,
            last_routed_message_id = $2,
            updated_at = CURRENT_TIMESTAMP
        WHERE chat_id = $1
      `,
      [chatId, messageId || null],
    );
  }

  getActiveTriageFlow() {
    return this.database.query<any>(
      `
        SELECT *
        FROM bot_triage_flows
        WHERE active = TRUE
        ORDER BY id ASC
        LIMIT 1
      `,
    );
  }

  listActiveTriageAudiences(flowId: number) {
    return this.database.query<any>(
      `
        SELECT *
        FROM bot_triage_audiences
        WHERE flow_id = $1
          AND active = TRUE
        ORDER BY sort_order ASC, id ASC
      `,
      [flowId],
    );
  }

  listActiveTriageIntents(audienceIds: number[]) {
    return this.database.query<any>(
      `
        SELECT
          bti.*,
          a.nome AS area_nome
        FROM bot_triage_intents bti
        INNER JOIN areas a ON a.id = bti.area_id
        WHERE bti.audience_id = ANY($1::int[])
          AND bti.active = TRUE
        ORDER BY bti.sort_order ASC, bti.id ASC
      `,
      [audienceIds],
    );
  }

  getPublishedBotFlowVersion() {
    return this.database.query<any>(
      `
        SELECT *
        FROM bot_flow_versions
        WHERE status = 'published'
          AND root_node_id IS NOT NULL
        ORDER BY published_at DESC, id DESC
        LIMIT 1
      `,
    );
  }

  listBotFlowNodes(versionId: number) {
    return this.database.query<any>(
      `
        SELECT
          node.*,
          area.nome AS area_nome,
          fallback_area.nome AS fallback_area_nome
        FROM bot_flow_nodes node
        LEFT JOIN areas area ON area.id = node.area_id
        LEFT JOIN areas fallback_area ON fallback_area.id = node.fallback_area_id
        WHERE node.version_id = $1
        ORDER BY node.parent_id NULLS FIRST, node.sort_order ASC, node.id ASC
      `,
      [versionId],
    );
  }

  listRoutingKeywords() {
    return this.database.query<{ id: number; nome: string; keyword: string }>(
      `
        SELECT a.id, a.nome, ark.keyword
        FROM area_routing_keywords ark
        INNER JOIN areas a ON a.id = ark.area_id
        WHERE ark.active = TRUE
          AND a.ativo = TRUE
        ORDER BY LENGTH(ark.keyword) DESC
      `,
    );
  }

  getAreaByName(targetName: string) {
    return this.database.query<{ id: number; nome: string }>(
      `SELECT id, nome FROM areas WHERE nome = $1 LIMIT 1`,
      [targetName],
    );
  }

  upsertTriage(chatId: string, attempts: number, messageId?: string) {
    return this.database.query(
      `
        INSERT INTO whatsapp_chat_atribuicoes (
          chat_id, user_id, area_id, status, routing_attempts, last_routed_message_id,
          last_bot_sent_at, conversation_started_at, expires_at, assigned_at, updated_at
        )
        VALUES (
          $1, NULL, NULL, 'bot_triage', $2, $3,
          CURRENT_TIMESTAMP, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP + INTERVAL '24 hours', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
        )
        ON CONFLICT (chat_id) DO UPDATE SET
          user_id = NULL,
          area_id = NULL,
          status = 'bot_triage',
          routing_attempts = EXCLUDED.routing_attempts,
          last_routed_message_id = EXCLUDED.last_routed_message_id,
          last_bot_sent_at = CURRENT_TIMESTAMP,
          updated_at = CURRENT_TIMESTAMP
        RETURNING *;
      `,
      [chatId, attempts, messageId || null],
    );
  }

  upsertConfiguredTriage(input: {
    chatId: string;
    flowId: number;
    audienceId: number | null;
    step: 'audience' | 'intent' | 'resolution';
    attempts: number;
    messageId?: string;
    intentId: number | null;
  }) {
    return this.database.query(
      `
        INSERT INTO whatsapp_chat_atribuicoes (
          chat_id, user_id, area_id, status, routing_attempts, last_routed_message_id,
          last_bot_sent_at, triage_flow_id, triage_audience_id, triage_intent_id, triage_step,
          conversation_started_at, expires_at, assigned_at, updated_at
        )
        VALUES (
          $1, NULL, NULL, 'bot_triage', $2, $3,
          CURRENT_TIMESTAMP, $4, $5, $6, $7,
          CURRENT_TIMESTAMP, CURRENT_TIMESTAMP + INTERVAL '24 hours', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
        )
        ON CONFLICT (chat_id) DO UPDATE SET
          user_id = NULL,
          area_id = NULL,
          status = 'bot_triage',
          routing_attempts = EXCLUDED.routing_attempts,
          last_routed_message_id = EXCLUDED.last_routed_message_id,
          last_bot_sent_at = CURRENT_TIMESTAMP,
          triage_flow_id = EXCLUDED.triage_flow_id,
          triage_audience_id = EXCLUDED.triage_audience_id,
          triage_intent_id = EXCLUDED.triage_intent_id,
          triage_step = EXCLUDED.triage_step,
          updated_at = CURRENT_TIMESTAMP
        RETURNING *;
      `,
      [input.chatId, input.attempts, input.messageId || null, input.flowId, input.audienceId, input.intentId, input.step],
    );
  }

  upsertBuilderTriage(chatId: string, versionId: number, nodeId: number, attempts: number, messageId?: string) {
    return this.database.query(
      `
        INSERT INTO whatsapp_chat_atribuicoes (
          chat_id, user_id, area_id, status, routing_attempts, last_routed_message_id,
          last_bot_sent_at, triage_builder_version_id, triage_builder_node_id,
          conversation_started_at, expires_at, assigned_at, updated_at
        )
        VALUES (
          $1, NULL, NULL, 'bot_triage', $2, $3,
          CURRENT_TIMESTAMP, $4, $5,
          CURRENT_TIMESTAMP, CURRENT_TIMESTAMP + INTERVAL '24 hours', CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
        )
        ON CONFLICT (chat_id) DO UPDATE SET
          user_id = NULL,
          area_id = NULL,
          status = 'bot_triage',
          routing_attempts = EXCLUDED.routing_attempts,
          last_routed_message_id = EXCLUDED.last_routed_message_id,
          last_bot_sent_at = CURRENT_TIMESTAMP,
          triage_flow_id = NULL,
          triage_audience_id = NULL,
          triage_intent_id = NULL,
          triage_step = NULL,
          triage_builder_version_id = EXCLUDED.triage_builder_version_id,
          triage_builder_node_id = EXCLUDED.triage_builder_node_id,
          updated_at = CURRENT_TIMESTAMP
        RETURNING *;
      `,
      [chatId, attempts, messageId || null, versionId, nodeId],
    );
  }

  markBotRoute(chatId: string, messageId?: string, updateBotTimestamp = true) {
    return this.database.query(
      `
        UPDATE whatsapp_chat_atribuicoes
        SET
          routing_attempts = 0,
          last_routed_message_id = $2,
          last_bot_sent_at = CASE WHEN $3 THEN CURRENT_TIMESTAMP ELSE last_bot_sent_at END,
          updated_at = CURRENT_TIMESTAMP
        WHERE chat_id = $1
      `,
      [chatId, messageId || null, updateBotTimestamp],
    );
  }

  markMessageRouted(chatId: string, messageId?: string) {
    return this.database.query(
      `
        UPDATE whatsapp_chat_atribuicoes
        SET
          last_routed_message_id = $2,
          updated_at = CURRENT_TIMESTAMP
        WHERE chat_id = $1
      `,
      [chatId, messageId || null],
    );
  }

  enrichAssignment(assignmentId: number) {
    return this.database.query(
      `
        SELECT
          wca.*,
          a.nome AS area_nome,
          u.nome AS user_nome,
          u.email AS user_email
        FROM whatsapp_chat_atribuicoes wca
        LEFT JOIN areas a ON a.id = wca.area_id
        LEFT JOIN usuarios u ON u.id = wca.user_id
        WHERE wca.id = $1
      `,
      [assignmentId],
    );
  }
}