/**
 * Organization API handlers
 */

import type { IApiContext, IApiResponse } from '../router.ts';
import { PermissionService } from '../../services/permission.service.ts';
import { AuditService } from '../../services/audit.service.ts';
import { Organization, OrganizationMember, User } from '../../models/index.ts';
import type { TOrganizationRole } from '../../interfaces/auth.interfaces.ts';

export class OrganizationApi {
  private permissionService: PermissionService;

  constructor(permissionService: PermissionService) {
    this.permissionService = permissionService;
  }

  /**
   * GET /api/v1/organizations
   */
  public async list(ctx: IApiContext): Promise<IApiResponse> {
    if (!ctx.actor?.userId) {
      return { status: 401, body: { error: 'Authentication required' } };
    }

    try {
      // System admins see all orgs, others see only their orgs
      let organizations: Organization[];

      if (ctx.actor.user?.isSystemAdmin) {
        organizations = await Organization.getInstances({});
      } else {
        organizations = await OrganizationMember.getUserOrganizations(ctx.actor.userId);
      }

      return {
        status: 200,
        body: {
          organizations: organizations.map((org) => ({
            id: org.id,
            name: org.name,
            displayName: org.displayName,
            description: org.description,
            avatarUrl: org.avatarUrl,
            isPublic: org.isPublic,
            memberCount: org.memberCount,
            createdAt: org.createdAt,
          })),
        },
      };
    } catch (error) {
      console.error('[OrganizationApi] List error:', error);
      return { status: 500, body: { error: 'Failed to list organizations' } };
    }
  }

  /**
   * GET /api/v1/organizations/:id
   */
  public async get(ctx: IApiContext): Promise<IApiResponse> {
    const { id } = ctx.params;

    try {
      const org = await Organization.findById(id);
      if (!org) {
        return { status: 404, body: { error: 'Organization not found' } };
      }

      // Check access - public orgs are visible to all authenticated users
      if (!org.isPublic && ctx.actor?.userId) {
        const isMember = await OrganizationMember.findMembership(id, ctx.actor.userId);
        if (!isMember && !ctx.actor.user?.isSystemAdmin) {
          return { status: 403, body: { error: 'Access denied' } };
        }
      }

      return {
        status: 200,
        body: {
          id: org.id,
          name: org.name,
          displayName: org.displayName,
          description: org.description,
          avatarUrl: org.avatarUrl,
          website: org.website,
          isPublic: org.isPublic,
          memberCount: org.memberCount,
          settings: ctx.actor?.user?.isSystemAdmin ? org.settings : undefined,
          usedStorageBytes: org.usedStorageBytes,
          createdAt: org.createdAt,
        },
      };
    } catch (error) {
      console.error('[OrganizationApi] Get error:', error);
      return { status: 500, body: { error: 'Failed to get organization' } };
    }
  }

  /**
   * POST /api/v1/organizations
   */
  public async create(ctx: IApiContext): Promise<IApiResponse> {
    if (!ctx.actor?.userId) {
      return { status: 401, body: { error: 'Authentication required' } };
    }

    try {
      const body = await ctx.request.json();
      const { name, displayName, description, isPublic } = body;

      if (!name) {
        return { status: 400, body: { error: 'Organization name is required' } };
      }

      // Validate name format
      if (!/^[a-z0-9]([a-z0-9-]*[a-z0-9])?$/.test(name)) {
        return {
          status: 400,
          body: { error: 'Name must be lowercase alphanumeric with optional hyphens' },
        };
      }

      // Check if name is taken
      const existing = await Organization.findByName(name);
      if (existing) {
        return { status: 409, body: { error: 'Organization name already taken' } };
      }

      // Create organization
      const org = new Organization();
      org.id = await Organization.getNewId();
      org.name = name;
      org.displayName = displayName || name;
      org.description = description;
      org.isPublic = isPublic ?? false;
      org.memberCount = 1;
      org.createdAt = new Date();
      org.createdById = ctx.actor.userId;

      await org.save();

      // Add creator as owner
      const membership = new OrganizationMember();
      membership.id = await OrganizationMember.getNewId();
      membership.organizationId = org.id;
      membership.userId = ctx.actor.userId;
      membership.role = 'owner';
      membership.addedById = ctx.actor.userId;
      membership.addedAt = new Date();

      await membership.save();

      // Audit log
      await AuditService.withContext({
        actorId: ctx.actor.userId,
        actorType: 'user',
        actorIp: ctx.ip,
      }).logOrganizationCreated(org.id, org.name);

      return {
        status: 201,
        body: {
          id: org.id,
          name: org.name,
          displayName: org.displayName,
          description: org.description,
          isPublic: org.isPublic,
          createdAt: org.createdAt,
        },
      };
    } catch (error) {
      console.error('[OrganizationApi] Create error:', error);
      return { status: 500, body: { error: 'Failed to create organization' } };
    }
  }

  /**
   * PUT /api/v1/organizations/:id
   */
  public async update(ctx: IApiContext): Promise<IApiResponse> {
    if (!ctx.actor?.userId) {
      return { status: 401, body: { error: 'Authentication required' } };
    }

    const { id } = ctx.params;

    // Check admin permission
    const canManage = await this.permissionService.canManageOrganization(ctx.actor.userId, id);
    if (!canManage) {
      return { status: 403, body: { error: 'Admin access required' } };
    }

    try {
      const org = await Organization.findById(id);
      if (!org) {
        return { status: 404, body: { error: 'Organization not found' } };
      }

      const body = await ctx.request.json();
      const { displayName, description, avatarUrl, website, isPublic, settings } = body;

      if (displayName !== undefined) org.displayName = displayName;
      if (description !== undefined) org.description = description;
      if (avatarUrl !== undefined) org.avatarUrl = avatarUrl;
      if (website !== undefined) org.website = website;
      if (isPublic !== undefined) org.isPublic = isPublic;

      // Only system admins can change settings
      if (settings && ctx.actor.user?.isSystemAdmin) {
        org.settings = { ...org.settings, ...settings };
      }

      await org.save();

      return {
        status: 200,
        body: {
          id: org.id,
          name: org.name,
          displayName: org.displayName,
          description: org.description,
          avatarUrl: org.avatarUrl,
          website: org.website,
          isPublic: org.isPublic,
        },
      };
    } catch (error) {
      console.error('[OrganizationApi] Update error:', error);
      return { status: 500, body: { error: 'Failed to update organization' } };
    }
  }

  /**
   * DELETE /api/v1/organizations/:id
   */
  public async delete(ctx: IApiContext): Promise<IApiResponse> {
    if (!ctx.actor?.userId) {
      return { status: 401, body: { error: 'Authentication required' } };
    }

    const { id } = ctx.params;

    // Only owners and system admins can delete
    const membership = await OrganizationMember.findMembership(id, ctx.actor.userId);
    if (membership?.role !== 'owner' && !ctx.actor.user?.isSystemAdmin) {
      return { status: 403, body: { error: 'Owner access required' } };
    }

    try {
      const org = await Organization.findById(id);
      if (!org) {
        return { status: 404, body: { error: 'Organization not found' } };
      }

      // TODO: Check for packages, repositories before deletion
      // For now, just delete the organization and memberships
      await org.delete();

      return {
        status: 200,
        body: { message: 'Organization deleted successfully' },
      };
    } catch (error) {
      console.error('[OrganizationApi] Delete error:', error);
      return { status: 500, body: { error: 'Failed to delete organization' } };
    }
  }

  /**
   * GET /api/v1/organizations/:id/members
   */
  public async listMembers(ctx: IApiContext): Promise<IApiResponse> {
    if (!ctx.actor?.userId) {
      return { status: 401, body: { error: 'Authentication required' } };
    }

    const { id } = ctx.params;

    // Check membership
    const isMember = await OrganizationMember.findMembership(id, ctx.actor.userId);
    if (!isMember && !ctx.actor.user?.isSystemAdmin) {
      return { status: 403, body: { error: 'Access denied' } };
    }

    try {
      const members = await OrganizationMember.getOrgMembers(id);

      // Fetch user details
      const membersWithUsers = await Promise.all(
        members.map(async (m) => {
          const user = await User.findById(m.userId);
          return {
            userId: m.userId,
            role: m.role,
            addedAt: m.addedAt,
            user: user
              ? {
                  username: user.username,
                  displayName: user.displayName,
                  avatarUrl: user.avatarUrl,
                }
              : null,
          };
        })
      );

      return {
        status: 200,
        body: { members: membersWithUsers },
      };
    } catch (error) {
      console.error('[OrganizationApi] List members error:', error);
      return { status: 500, body: { error: 'Failed to list members' } };
    }
  }

  /**
   * POST /api/v1/organizations/:id/members
   */
  public async addMember(ctx: IApiContext): Promise<IApiResponse> {
    if (!ctx.actor?.userId) {
      return { status: 401, body: { error: 'Authentication required' } };
    }

    const { id } = ctx.params;

    // Check admin permission
    const canManage = await this.permissionService.canManageOrganization(ctx.actor.userId, id);
    if (!canManage) {
      return { status: 403, body: { error: 'Admin access required' } };
    }

    try {
      const body = await ctx.request.json();
      const { userId, role } = body as { userId: string; role: TOrganizationRole };

      if (!userId || !role) {
        return { status: 400, body: { error: 'userId and role are required' } };
      }

      if (!['owner', 'admin', 'member'].includes(role)) {
        return { status: 400, body: { error: 'Invalid role' } };
      }

      // Check user exists
      const user = await User.findById(userId);
      if (!user) {
        return { status: 404, body: { error: 'User not found' } };
      }

      // Check if already a member
      const existing = await OrganizationMember.findMembership(id, userId);
      if (existing) {
        return { status: 409, body: { error: 'User is already a member' } };
      }

      // Add member
      const membership = new OrganizationMember();
      membership.id = await OrganizationMember.getNewId();
      membership.organizationId = id;
      membership.userId = userId;
      membership.role = role;
      membership.addedById = ctx.actor.userId;
      membership.addedAt = new Date();

      await membership.save();

      // Update member count
      const org = await Organization.findById(id);
      if (org) {
        org.memberCount += 1;
        await org.save();
      }

      return {
        status: 201,
        body: {
          userId: membership.userId,
          role: membership.role,
          addedAt: membership.addedAt,
        },
      };
    } catch (error) {
      console.error('[OrganizationApi] Add member error:', error);
      return { status: 500, body: { error: 'Failed to add member' } };
    }
  }

  /**
   * PUT /api/v1/organizations/:id/members/:userId
   */
  public async updateMember(ctx: IApiContext): Promise<IApiResponse> {
    if (!ctx.actor?.userId) {
      return { status: 401, body: { error: 'Authentication required' } };
    }

    const { id, userId } = ctx.params;

    // Check admin permission
    const canManage = await this.permissionService.canManageOrganization(ctx.actor.userId, id);
    if (!canManage) {
      return { status: 403, body: { error: 'Admin access required' } };
    }

    try {
      const body = await ctx.request.json();
      const { role } = body as { role: TOrganizationRole };

      if (!role || !['owner', 'admin', 'member'].includes(role)) {
        return { status: 400, body: { error: 'Valid role is required' } };
      }

      const membership = await OrganizationMember.findMembership(id, userId);
      if (!membership) {
        return { status: 404, body: { error: 'Member not found' } };
      }

      // Cannot change last owner
      if (membership.role === 'owner' && role !== 'owner') {
        const owners = await OrganizationMember.getOrgMembers(id);
        const ownerCount = owners.filter((m) => m.role === 'owner').length;
        if (ownerCount <= 1) {
          return { status: 400, body: { error: 'Cannot remove the last owner' } };
        }
      }

      membership.role = role;
      await membership.save();

      return {
        status: 200,
        body: {
          userId: membership.userId,
          role: membership.role,
        },
      };
    } catch (error) {
      console.error('[OrganizationApi] Update member error:', error);
      return { status: 500, body: { error: 'Failed to update member' } };
    }
  }

  /**
   * DELETE /api/v1/organizations/:id/members/:userId
   */
  public async removeMember(ctx: IApiContext): Promise<IApiResponse> {
    if (!ctx.actor?.userId) {
      return { status: 401, body: { error: 'Authentication required' } };
    }

    const { id, userId } = ctx.params;

    // Users can remove themselves, admins can remove others
    if (userId !== ctx.actor.userId) {
      const canManage = await this.permissionService.canManageOrganization(ctx.actor.userId, id);
      if (!canManage) {
        return { status: 403, body: { error: 'Admin access required' } };
      }
    }

    try {
      const membership = await OrganizationMember.findMembership(id, userId);
      if (!membership) {
        return { status: 404, body: { error: 'Member not found' } };
      }

      // Cannot remove last owner
      if (membership.role === 'owner') {
        const owners = await OrganizationMember.getOrgMembers(id);
        const ownerCount = owners.filter((m) => m.role === 'owner').length;
        if (ownerCount <= 1) {
          return { status: 400, body: { error: 'Cannot remove the last owner' } };
        }
      }

      await membership.delete();

      // Update member count
      const org = await Organization.findById(id);
      if (org) {
        org.memberCount = Math.max(0, org.memberCount - 1);
        await org.save();
      }

      return {
        status: 200,
        body: { message: 'Member removed successfully' },
      };
    } catch (error) {
      console.error('[OrganizationApi] Remove member error:', error);
      return { status: 500, body: { error: 'Failed to remove member' } };
    }
  }
}