from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session

from app.database import get_db
from app.dependencies import get_current_user
from app.models.user import User
from app.models.tenant import WorkspaceInvitation
from app.schemas.tenant import (
    InvitationCreate,
    InvitationResponse,
    MemberResponse,
    RoleUpdate,
    AuditEventResponse,
    WorkspaceCreate,
    WorkspaceResponse,
)
from app.config import settings
from app.services.tenant_service import (
    accept_invitation,
    can_manage,
    create_workspace,
    get_membership,
    get_workspace,
    invite_member,
    list_audit_events,
    revoke_invitation,
    transfer_ownership,
    list_members,
    list_workspaces,
    update_member_role,
)

router = APIRouter(prefix="/tenants", tags=["tenants"])


def workspace_response(row) -> WorkspaceResponse:
    workspace, organization, role = row
    return WorkspaceResponse(
        id=workspace.id,
        organization_id=organization.id,
        organization_name=organization.name,
        name=workspace.name,
        slug=workspace.slug,
        role=role,
        created_at=workspace.created_at,
    )


@router.get("/workspaces", response_model=list[WorkspaceResponse])
def get_workspaces(current_user: User = Depends(get_current_user), db: Session = Depends(get_db)):
    return [workspace_response(row) for row in list_workspaces(db, current_user.id)]


@router.post("/workspaces", response_model=WorkspaceResponse, status_code=status.HTTP_201_CREATED)
def post_workspace(data: WorkspaceCreate, current_user: User = Depends(get_current_user), db: Session = Depends(get_db)):
    workspace = create_workspace(db, current_user, data)
    row = get_workspace(db, workspace.id, current_user.id)
    return workspace_response(row)


@router.get("/workspaces/{workspace_id}/members", response_model=list[MemberResponse])
def get_workspace_members(workspace_id: int, current_user: User = Depends(get_current_user), db: Session = Depends(get_db)):
    if get_workspace(db, workspace_id, current_user.id) is None:
        raise HTTPException(status_code=403, detail="Workspace not found or access denied")
    return [
        MemberResponse(user_id=user.id, email=user.email, full_name=user.full_name, username=user.username, role=membership.role, joined_at=membership.created_at)
        for user, membership in list_members(db, workspace_id)
    ]


@router.post("/workspaces/{workspace_id}/invitations", response_model=InvitationResponse, status_code=201)
def post_invitation(workspace_id: int, data: InvitationCreate, current_user: User = Depends(get_current_user), db: Session = Depends(get_db)):
    row = get_workspace(db, workspace_id, current_user.id)
    if row is None or not can_manage(row[2]):
        raise HTTPException(status_code=403, detail="Only workspace owners and admins can invite members")
    invitation = invite_member(db, workspace_id, current_user.id, str(data.email), data.role)
    return InvitationResponse(
        id=invitation.id,
        workspace_id=invitation.workspace_id,
        email=invitation.email,
        role=invitation.role,
        expires_at=invitation.expires_at,
        accepted=invitation.accepted,
        token=invitation.token,
        invite_url=f"{settings.frontend_url}/invite/{invitation.token}",
    )


@router.delete("/workspaces/{workspace_id}/invitations/{invitation_id}", status_code=204)
def delete_invitation(workspace_id: int, invitation_id: int, current_user: User = Depends(get_current_user), db: Session = Depends(get_db)):
    row = get_workspace(db, workspace_id, current_user.id)
    if row is None or not can_manage(row[2]) or not revoke_invitation(db, workspace_id, invitation_id, current_user.id):
        raise HTTPException(status_code=404, detail="Invitation not found")


@router.post("/workspaces/{workspace_id}/invitations/{invitation_id}/resend", response_model=InvitationResponse)
def resend_invitation(workspace_id: int, invitation_id: int, current_user: User = Depends(get_current_user), db: Session = Depends(get_db)):
    row = get_workspace(db, workspace_id, current_user.id)
    invitation = db.query(WorkspaceInvitation).filter_by(id=invitation_id, workspace_id=workspace_id, accepted=False).first()
    if row is None or not can_manage(row[2]) or invitation is None:
        raise HTTPException(status_code=404, detail="Invitation not found")
    invitation.accepted = True
    db.commit()
    replacement = invite_member(db, workspace_id, current_user.id, invitation.email, invitation.role)
    return InvitationResponse(
        id=replacement.id,
        workspace_id=replacement.workspace_id,
        email=replacement.email,
        role=replacement.role,
        expires_at=replacement.expires_at,
        accepted=replacement.accepted,
        token=replacement.token,
        invite_url=f"{settings.frontend_url}/invite/{replacement.token}",
    )


@router.post("/workspaces/{workspace_id}/ownership/{user_id}", response_model=WorkspaceResponse)
def post_transfer_ownership(workspace_id: int, user_id: int, current_user: User = Depends(get_current_user), db: Session = Depends(get_db)):
    row = get_workspace(db, workspace_id, current_user.id)
    if row is None or row[2] != "owner" or not transfer_ownership(db, workspace_id, current_user.id, user_id):
        raise HTTPException(status_code=403, detail="Only the workspace owner can transfer ownership")
    return workspace_response(get_workspace(db, workspace_id, user_id))


@router.get("/workspaces/{workspace_id}/audit", response_model=list[AuditEventResponse])
def get_audit(workspace_id: int, current_user: User = Depends(get_current_user), db: Session = Depends(get_db)):
    row = get_workspace(db, workspace_id, current_user.id)
    if row is None or not can_manage(row[2]):
        raise HTTPException(status_code=403, detail="Only workspace admins can view audit history")
    return [AuditEventResponse.model_validate(event, from_attributes=True) for event in list_audit_events(db, workspace_id)]


@router.post("/invitations/{token}/accept", response_model=MemberResponse)
def post_accept_invitation(token: str, current_user: User = Depends(get_current_user), db: Session = Depends(get_db)):
    membership = accept_invitation(db, token, current_user)
    if membership is None:
        raise HTTPException(status_code=400, detail="Invitation is invalid, expired, or not addressed to this account")
    return MemberResponse(user_id=current_user.id, email=current_user.email, full_name=current_user.full_name, username=current_user.username, role=membership.role, joined_at=membership.created_at)


@router.patch("/workspaces/{workspace_id}/members/{user_id}", response_model=MemberResponse)
def patch_member_role(workspace_id: int, user_id: int, data: RoleUpdate, current_user: User = Depends(get_current_user), db: Session = Depends(get_db)):
    row = get_workspace(db, workspace_id, current_user.id)
    if row is None or not can_manage(row[2]):
        raise HTTPException(status_code=403, detail="Only workspace owners and admins can manage roles")
    membership = update_member_role(db, workspace_id, user_id, data.role)
    target = db.query(User).filter(User.id == user_id).first()
    if membership is None or target is None:
        raise HTTPException(status_code=400, detail="Member role cannot be changed")
    return MemberResponse(user_id=target.id, email=target.email, full_name=target.full_name, username=target.username, role=membership.role, joined_at=membership.created_at)