/**
 * Team Service - Team management operations
 */

import { getPool } from '../config';
import { logger } from '../utils/logger';
import {
  TeamMember,
  TeamMemberWithUser,
  Invitation,
  InvitationWithDetails,
  AddTeamMemberInput,
  UpdateTeamMemberInput,
  RemoveTeamMemberInput,
  ListTeamMembersInput,
  CreateInvitationInput,
  CreateInvitationResult,
  AcceptInvitationInput,
  AcceptInvitationResult,
  ResendInvitationInput,
  ResendInvitationResult,
  RevokeInvitationInput,
  ListInvitationsInput,
  GetInvitationByTokenInput,
} from '../types/team.types';

class TeamService {
  // ================== Team Members ==================

  /**
   * Add a team member
   */
  async addTeamMember(input: AddTeamMemberInput): Promise<TeamMember> {
    const pool = getPool();

    logger.info('Adding team member', {
      tenantId: input.tenantId,
      userId: input.userId,
    });

    const result = await pool.query(
      `SELECT * FROM teams.add_team_member($1, $2, $3, $4, NULL, $5, $6)`,
      [
        input.tenantId,
        input.userId,
        input.memberRole || 'member',
        input.addedBy,
        input.department,
        input.jobTitle,
      ]
    );

    // Get the created member
    const memberResult = await pool.query(
      `SELECT * FROM teams.team_members
       WHERE tenant_id = $1 AND user_id = $2 AND removed_at IS NULL`,
      [input.tenantId, input.userId]
    );

    return this.mapTeamMemberRow(memberResult.rows[0]);
  }

  /**
   * Update a team member
   */
  async updateTeamMember(input: UpdateTeamMemberInput): Promise<TeamMember> {
    const pool = getPool();

    logger.info('Updating team member', {
      tenantId: input.tenantId,
      userId: input.userId,
    });

    const updates: string[] = [];
    const values: unknown[] = [];
    let paramIndex = 1;

    if (input.memberRole !== undefined) {
      updates.push(`member_role = $${paramIndex++}`);
      values.push(input.memberRole);
    }
    if (input.department !== undefined) {
      updates.push(`department = $${paramIndex++}`);
      values.push(input.department);
    }
    if (input.jobTitle !== undefined) {
      updates.push(`job_title = $${paramIndex++}`);
      values.push(input.jobTitle);
    }
    if (input.status !== undefined) {
      updates.push(`status = $${paramIndex++}`);
      values.push(input.status);
    }

    updates.push(`updated_at = CURRENT_TIMESTAMP`);

    values.push(input.tenantId);
    values.push(input.userId);

    const result = await pool.query(
      `UPDATE teams.team_members
       SET ${updates.join(', ')}
       WHERE tenant_id = $${paramIndex++} AND user_id = $${paramIndex++} AND removed_at IS NULL
       RETURNING *`,
      values
    );

    if (result.rowCount === 0) {
      throw new Error('Team member not found');
    }

    return this.mapTeamMemberRow(result.rows[0]);
  }

  /**
   * Remove a team member
   */
  async removeTeamMember(input: RemoveTeamMemberInput): Promise<boolean> {
    const pool = getPool();

    logger.info('Removing team member', {
      tenantId: input.tenantId,
      userId: input.userId,
    });

    await pool.query(`SELECT teams.remove_team_member($1, $2, $3)`, [
      input.tenantId,
      input.userId,
      input.removedBy,
    ]);

    return true;
  }

  /**
   * List team members
   */
  async listTeamMembers(input: ListTeamMembersInput): Promise<TeamMemberWithUser[]> {
    const pool = getPool();

    let query = `SELECT * FROM teams.v_team_members WHERE tenant_id = $1`;
    const values: unknown[] = [input.tenantId];
    let paramIndex = 2;

    if (input.status) {
      query += ` AND status = $${paramIndex++}`;
      values.push(input.status);
    }
    if (input.memberRole) {
      query += ` AND member_role = $${paramIndex++}`;
      values.push(input.memberRole);
    }
    if (input.department) {
      query += ` AND department = $${paramIndex++}`;
      values.push(input.department);
    }

    query += ` ORDER BY joined_at DESC`;

    const result = await pool.query(query, values);
    return result.rows.map((row) => this.mapTeamMemberWithUserRow(row));
  }

  /**
   * Get team member by user ID
   */
  async getTeamMember(tenantId: string, userId: string): Promise<TeamMemberWithUser | null> {
    const pool = getPool();

    const result = await pool.query(
      `SELECT * FROM teams.v_team_members WHERE tenant_id = $1 AND user_id = $2`,
      [tenantId, userId]
    );

    if (result.rowCount === 0) {
      return null;
    }

    return this.mapTeamMemberWithUserRow(result.rows[0]);
  }

  /**
   * Get team member count
   */
  async getTeamMemberCount(tenantId: string): Promise<number> {
    const pool = getPool();

    const result = await pool.query(
      `SELECT COUNT(*) FROM teams.team_members
       WHERE tenant_id = $1 AND removed_at IS NULL AND status = 'active'`,
      [tenantId]
    );

    return parseInt(result.rows[0].count, 10);
  }

  // ================== Invitations ==================

  /**
   * Create an invitation
   */
  async createInvitation(input: CreateInvitationInput): Promise<CreateInvitationResult> {
    const pool = getPool();

    logger.info('Creating invitation', {
      tenantId: input.tenantId,
      email: input.email,
    });

    const result = await pool.query(
      `SELECT * FROM teams.create_invitation($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)`,
      [
        input.tenantId,
        input.email,
        input.invitedBy,
        input.roleId || null,
        input.firstName || null,
        input.lastName || null,
        input.department || null,
        input.jobTitle || null,
        input.personalMessage || null,
        input.expiresInDays || 7,
      ]
    );

    return {
      invitationId: result.rows[0].invitation_id,
      token: result.rows[0].token,
    };
  }

  /**
   * Accept an invitation
   */
  async acceptInvitation(input: AcceptInvitationInput): Promise<AcceptInvitationResult> {
    const pool = getPool();

    logger.info('Accepting invitation', { userId: input.userId });

    const result = await pool.query(`SELECT * FROM teams.accept_invitation($1, $2)`, [
      input.token,
      input.userId,
    ]);

    const row = result.rows[0];
    return {
      success: row.success,
      tenantId: row.tenant_id,
      roleId: row.role_id,
      message: row.message,
    };
  }

  /**
   * Resend an invitation
   */
  async resendInvitation(input: ResendInvitationInput): Promise<ResendInvitationResult> {
    const pool = getPool();

    logger.info('Resending invitation', { invitationId: input.invitationId });

    const result = await pool.query(`SELECT * FROM teams.resend_invitation($1, $2)`, [
      input.invitationId,
      input.resentBy,
    ]);

    const row = result.rows[0];
    return {
      success: row.success,
      token: row.token,
      message: row.message,
    };
  }

  /**
   * Revoke an invitation
   */
  async revokeInvitation(input: RevokeInvitationInput): Promise<boolean> {
    const pool = getPool();

    logger.info('Revoking invitation', { invitationId: input.invitationId });

    const result = await pool.query(
      `UPDATE teams.invitations
       SET status = 'revoked', revoked_at = CURRENT_TIMESTAMP, revoked_by = $2, updated_at = CURRENT_TIMESTAMP
       WHERE id = $1 AND status = 'pending'`,
      [input.invitationId, input.revokedBy]
    );

    return result.rowCount !== null && result.rowCount > 0;
  }

  /**
   * List invitations
   */
  async listInvitations(input: ListInvitationsInput): Promise<InvitationWithDetails[]> {
    const pool = getPool();

    let query = `SELECT * FROM teams.v_invitations WHERE tenant_id = $1`;
    const values: unknown[] = [input.tenantId];

    if (input.status) {
      query += ` AND status = $2`;
      values.push(input.status);
    }

    query += ` ORDER BY sent_at DESC`;

    const result = await pool.query(query, values);
    return result.rows.map((row) => this.mapInvitationWithDetailsRow(row));
  }

  /**
   * Get invitation by ID
   */
  async getInvitation(invitationId: string): Promise<InvitationWithDetails | null> {
    const pool = getPool();

    const result = await pool.query(`SELECT * FROM teams.v_invitations WHERE id = $1`, [
      invitationId,
    ]);

    if (result.rowCount === 0) {
      return null;
    }

    return this.mapInvitationWithDetailsRow(result.rows[0]);
  }

  /**
   * Get invitation by token (for acceptance page)
   */
  async getInvitationByToken(input: GetInvitationByTokenInput): Promise<InvitationWithDetails | null> {
    const pool = getPool();

    const result = await pool.query(
      `SELECT v.* FROM teams.v_invitations v
       JOIN teams.invitations i ON v.id = i.id
       WHERE i.token_hash = encode(sha256($1::bytea), 'hex')`,
      [input.token]
    );

    if (result.rowCount === 0) {
      return null;
    }

    return this.mapInvitationWithDetailsRow(result.rows[0]);
  }

  /**
   * Expire old invitations (scheduled job)
   */
  async expireOldInvitations(): Promise<number> {
    const pool = getPool();

    const result = await pool.query(`SELECT teams.expire_old_invitations()`);
    return result.rows[0].expire_old_invitations;
  }

  // ================== Row Mappers ==================

  private mapTeamMemberRow(row: Record<string, unknown>): TeamMember {
    return {
      id: row.id as string,
      tenantId: row.tenant_id as string,
      userId: row.user_id as string,
      memberRole: row.member_role as TeamMember['memberRole'],
      status: row.status as TeamMember['status'],
      department: row.department as string | null,
      jobTitle: row.job_title as string | null,
      joinedViaInvitation: row.joined_via_invitation as string | null,
      joinedAt: new Date(row.joined_at as string),
      lastActiveAt: row.last_active_at ? new Date(row.last_active_at as string) : null,
      settings: (row.settings as Record<string, unknown>) || {},
      createdAt: new Date(row.created_at as string),
      updatedAt: new Date(row.updated_at as string),
      addedBy: row.added_by as string | null,
      removedAt: row.removed_at ? new Date(row.removed_at as string) : null,
      removedBy: row.removed_by as string | null,
    };
  }

  private mapTeamMemberWithUserRow(row: Record<string, unknown>): TeamMemberWithUser {
    return {
      ...this.mapTeamMemberRow(row),
      userEmail: row.user_email as string,
      userDisplayName: row.user_display_name as string | null,
      userFirstName: row.user_first_name as string | null,
      userLastName: row.user_last_name as string | null,
      userAvatarUrl: row.user_avatar_url as string | null,
      primaryRoleName: row.primary_role_name as string | null,
    };
  }

  private mapInvitationRow(row: Record<string, unknown>): Invitation {
    return {
      id: row.id as string,
      tenantId: row.tenant_id as string,
      email: row.email as string,
      firstName: row.first_name as string | null,
      lastName: row.last_name as string | null,
      roleId: row.role_id as string | null,
      department: row.department as string | null,
      jobTitle: row.job_title as string | null,
      personalMessage: row.personal_message as string | null,
      status: row.status as Invitation['status'],
      expiresAt: new Date(row.expires_at as string),
      sentAt: new Date(row.sent_at as string),
      resentCount: row.resent_count as number,
      lastResentAt: row.last_resent_at ? new Date(row.last_resent_at as string) : null,
      respondedAt: row.responded_at ? new Date(row.responded_at as string) : null,
      acceptedUserId: row.accepted_user_id as string | null,
      createdAt: new Date(row.created_at as string),
      updatedAt: new Date(row.updated_at as string),
      invitedBy: row.invited_by as string,
      revokedAt: row.revoked_at ? new Date(row.revoked_at as string) : null,
      revokedBy: row.revoked_by as string | null,
    };
  }

  private mapInvitationWithDetailsRow(row: Record<string, unknown>): InvitationWithDetails {
    return {
      ...this.mapInvitationRow(row),
      tenantName: row.tenant_name as string,
      roleName: row.role_name as string | null,
      invitedByEmail: row.invited_by_email as string,
      invitedByName: row.invited_by_name as string | null,
      isExpired: row.is_expired as boolean,
    };
  }
}

export const teamService = new TeamService();