"""Workspace API routes for VoIdea."""

from typing import Annotated
from uuid import UUID

from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.dependencies import get_current_user, get_db
from app.models.user import User
from app.schemas.workspace import (
    AddMemberRequest,
    MemberResponse,
    WorkspaceCreate,
    WorkspaceResponse,
    WorkspaceUpdate,
)
from app.services.workspace_service import WorkspaceError, WorkspaceLimitError, WorkspaceService

router = APIRouter()


def _ws_to_response(ws, member_count=0) -> WorkspaceResponse:
    return WorkspaceResponse(
        id=str(ws.id),
        name=ws.name,
        type=ws.type,
        owner_id=str(ws.owner_id),
        description=ws.description,
        member_count=member_count,
        created_at=ws.created_at,
        updated_at=ws.updated_at,
    )


@router.get("/", response_model=list[WorkspaceResponse])
async def list_workspaces(
    user: Annotated[User, Depends(get_current_user)],
    db: AsyncSession = Depends(get_db),
):
    svc = WorkspaceService(db)

    personal = await svc.create_personal(user.id)
    workspaces = await svc.list_user_workspaces(user.id)

    result = []
    for ws in workspaces:
        members = await svc.list_members(ws.id)
        result.append(_ws_to_response(ws, member_count=len(members)))
    return result


@router.post("/", response_model=WorkspaceResponse, status_code=status.HTTP_201_CREATED)
async def create_workspace(
    body: WorkspaceCreate,
    user: Annotated[User, Depends(get_current_user)],
    db: AsyncSession = Depends(get_db),
):
    svc = WorkspaceService(db)
    try:
        if body.type == "personal":
            ws = await svc.create_personal(user.id, body.name)
        else:
            ws = await svc.create_team(body.name, user.id)
        members = await svc.list_members(ws.id)
        return _ws_to_response(ws, member_count=len(members))
    except WorkspaceLimitError as e:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail=str(e))
    except WorkspaceError as e:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))


@router.get("/{workspace_id}", response_model=WorkspaceResponse)
async def get_workspace(
    workspace_id: str,
    user: Annotated[User, Depends(get_current_user)],
    db: AsyncSession = Depends(get_db),
):
    svc = WorkspaceService(db)
    ws = await svc.get_by_id(UUID(workspace_id))
    if not ws:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Workspace not found")
    membership = await svc.get_membership(ws.id, user.id)
    if not membership:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Not a member")
    members = await svc.list_members(ws.id)
    return _ws_to_response(ws, member_count=len(members))


@router.patch("/{workspace_id}", response_model=WorkspaceResponse)
async def update_workspace(
    workspace_id: str,
    body: WorkspaceUpdate,
    user: Annotated[User, Depends(get_current_user)],
    db: AsyncSession = Depends(get_db),
):
    svc = WorkspaceService(db)
    try:
        ws = await svc.update_workspace(
            UUID(workspace_id), user.id, body.model_dump(exclude_none=True)
        )
        if not ws:
            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Workspace not found")
        members = await svc.list_members(ws.id)
        return _ws_to_response(ws, member_count=len(members))
    except WorkspaceError as e:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))


@router.delete("/{workspace_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_workspace(
    workspace_id: str,
    user: Annotated[User, Depends(get_current_user)],
    db: AsyncSession = Depends(get_db),
):
    svc = WorkspaceService(db)
    try:
        success = await svc.delete_workspace(UUID(workspace_id), user.id)
        if not success:
            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Workspace not found")
    except WorkspaceError as e:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))


# ── Members ──


@router.get("/{workspace_id}/members", response_model=list[MemberResponse])
async def list_members(
    workspace_id: str,
    user: Annotated[User, Depends(get_current_user)],
    db: AsyncSession = Depends(get_db),
):
    svc = WorkspaceService(db)
    ws = await svc.get_by_id(UUID(workspace_id))
    if not ws:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Workspace not found")
    membership = await svc.get_membership(ws.id, user.id)
    if not membership:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Not a member")
    members = await svc.list_members(ws.id)
    return [MemberResponse(**m) for m in members]


@router.post("/{workspace_id}/members", response_model=MemberResponse, status_code=status.HTTP_201_CREATED)
async def add_member(
    workspace_id: str,
    body: AddMemberRequest,
    user: Annotated[User, Depends(get_current_user)],
    db: AsyncSession = Depends(get_db),
):
    svc = WorkspaceService(db)
    try:
        member = await svc.add_member(UUID(workspace_id), UUID(body.user_id), body.role)
        members = await svc.list_members(ws_id := UUID(workspace_id))
        m = next((m for m in members if m["id"] == str(member.id)), None)
        return MemberResponse(**m) if m else MemberResponse(
            id=str(member.id), user_id=str(member.user_id),
            workspace_id=str(member.workspace_id), role=member.role,
            joined_at=member.created_at,
        )
    except WorkspaceLimitError as e:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail=str(e))
    except WorkspaceError as e:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))


@router.delete("/{workspace_id}/members/{member_id}", status_code=status.HTTP_204_NO_CONTENT)
async def remove_member(
    workspace_id: str,
    member_id: str,
    user: Annotated[User, Depends(get_current_user)],
    db: AsyncSession = Depends(get_db),
):
    svc = WorkspaceService(db)
    success = await svc.remove_member(UUID(workspace_id), UUID(member_id))
    if not success:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Member not found")