"""B01_Dashboard 역할별 대시보드 API."""

import mimetypes
import os
from typing import Any

from fastapi import APIRouter, Depends, File, Form, HTTPException, Query, Response, UploadFile

from common_util.common_util_auth import require_company, require_system_admin, verify_session
from common_util.common_util_project_delete import hard_delete_project
from common_util.common_util_storage import read_stored_asset
from config.config_system import PROJECT_DELETE_HARD_ENABLED

from .B01_Dashboard_Repository import (
    assign_user_company,
    change_user_role,
    count_company_admins,
    create_company,
    get_dashboard_me,
    get_project,
    get_system_resources,
    get_user_admin_target,
    get_user_company,
    join_company,
    list_all_companies,
    list_all_projects,
    list_all_users,
    list_audit_logs,
    list_company_projects,
    list_join_requests,
    list_user_projects,
    process_join_request,
    search_companies,
    soft_delete_project,
    update_admin_user,
    update_project,
    update_user_profile,
)
from .B01_Dashboard_Repository_Assets import (
    ASSET_EXTENSIONS,
    ASSET_KINDS,
    ASSET_MAX_BYTES,
    create_company_asset,
    delete_company_asset,
    get_company_asset,
    list_company_assets,
    update_company_asset,
    write_company_asset_file,
)
from .B01_Dashboard_Repository_Members import (
    add_company_member,
    check_project_refs,
    list_company_members,
    remove_company_member,
    set_company_logo,
)
from .B01_Dashboard_Schema import (
    AddMemberRequest,
    AdminUpdateUserRequest,
    AssignCompanyRequest,
    ChangeUserRoleRequest,
    CreateCompanyRequest,
    JoinCompanyRequest,
    ProcessJoinRequest,
    UpdateCompanyAssetRequest,
    UpdateCompanyLogoRequest,
    UpdateProjectRequest,
    UpdateUserRequest,
)

router = APIRouter(prefix="/api/dashboard", tags=["B01_Dashboard"])


async def require_company_admin(
    session: dict[str, Any] = Depends(verify_session),
) -> dict[str, Any]:
    if session["role"] not in ("ADMIN", "SYSTEM_ADMIN") and not session["is_master"]:
        raise HTTPException(status_code=403, detail="회사 관리자 권한이 필요합니다.")
    return session


def _require_company_id(session: dict[str, Any]) -> int:
    company_id = session.get("company_id")
    if company_id is None:
        raise HTTPException(status_code=403, detail="회사 연결이 필요합니다.")
    return int(company_id)


def _same_company(session: dict[str, Any], company_id: int | None) -> bool:
    return company_id is not None and int(session.get("company_id") or 0) == int(company_id)


def _scope_company(session: dict[str, Any], company_id: int | None) -> int:
    """회사 범위 자원(구성원·로고·서명)의 회사. 시스템관리자만 남의 회사를 지정할 수 있다."""
    if session["role"] == "SYSTEM_ADMIN" and company_id is not None:
        return int(company_id)
    own = _require_company_id(session)
    if company_id is not None and int(company_id) != own:
        raise HTTPException(status_code=403, detail="다른 회사의 자료는 볼 수 없습니다.")
    return own


async def _company_asset(session: dict[str, Any], asset_id: int) -> dict[str, Any]:
    asset = await get_company_asset(asset_id)
    if not asset:
        raise HTTPException(status_code=404, detail="자산을 찾을 수 없습니다.")
    _scope_company(session, int(asset["company_id"]))
    return asset


def _can_edit_project(session: dict[str, Any], project: dict[str, Any]) -> bool:
    if session["role"] == "SYSTEM_ADMIN":
        return True
    if session["role"] == "ADMIN":
        return _same_company(session, project.get("company_id"))
    return False


def _can_edit_user(session: dict[str, Any], target: dict[str, Any]) -> bool:
    if session["role"] == "SYSTEM_ADMIN":
        return True
    if session["role"] == "ADMIN":
        return _same_company(session, target.get("company_id"))
    return int(session["user_id"]) == int(target["id"])


@router.get("/me")
async def dashboard_me(session: dict[str, Any] = Depends(verify_session)):
    user = await get_dashboard_me(int(session["user_id"]))
    if not user:
        raise HTTPException(status_code=404, detail="사용자 정보를 찾을 수 없습니다.")
    # 삭제 버튼이 원본까지 지우는 모드인지 화면에 알려 경고 문구를 바꾸게 한다.
    user["project_delete_hard"] = PROJECT_DELETE_HARD_ENABLED
    return {"status": "success", "user": user}


@router.patch("/me")
async def patch_dashboard_me(
    payload: UpdateUserRequest,
    session: dict[str, Any] = Depends(verify_session),
):
    user = await update_user_profile(int(session["user_id"]), payload.model_dump())
    return {"status": "success", "user": user}


@router.get("/user/projects")
async def user_projects(session: dict[str, Any] = Depends(verify_session)):
    # 회사에 속하면 회사 프로젝트 전체를 본다 (2026-09-06 사용자 지시) — 수정 권한은 따로다.
    company_id = session.get("company_id")
    projects = (
        await list_company_projects(int(company_id))
        if company_id
        else await list_user_projects(int(session["user_id"]))
    )
    return {"status": "success", "projects": projects}


@router.get("/user/company")
async def user_company(session: dict[str, Any] = Depends(verify_session)):
    return {"status": "success", "company": await get_user_company(session.get("company_id"))}


@router.get("/user/companies")
async def user_company_search(
    q: str = Query(min_length=1, max_length=100),
    session: dict[str, Any] = Depends(verify_session),
):
    _ = session
    return {"status": "success", "companies": await search_companies(q.strip())}


@router.post("/user/company/create")
async def user_company_create(
    payload: CreateCompanyRequest,
    session: dict[str, Any] = Depends(verify_session),
):
    result = await create_company(int(session["user_id"]), payload.model_dump())
    return {"status": "success", **result}


@router.post("/user/company/join")
async def user_company_join(
    payload: JoinCompanyRequest,
    session: dict[str, Any] = Depends(verify_session),
):
    result = await join_company(int(session["user_id"]), payload.company_id)
    if result is None:
        raise HTTPException(
            status_code=409,
            detail="이미 회사에 소속돼 있습니다. 소속을 옮기려면 회사 관리자에게 요청하십시오.",
        )
    return {"status": "success", **result}


@router.get("/admin/members")
async def admin_members(
    company_id: int | None = Query(None, gt=0),
    session: dict[str, Any] = Depends(require_company),
):
    # 읽기는 회사 구성원 누구나 — B02 등록 화면에서 일반 사용자도 담당자를 골라야 한다
    # (2026-09-02 사용자 지시). 쓰기(POST·DELETE)는 관리자 그대로다.
    # company_id 는 시스템관리자가 남의 회사 프로젝트 담당자를 고를 때만 쓴다.
    return {
        "status": "success",
        "members": await list_company_members(_scope_company(session, company_id)),
    }


@router.post("/admin/members")
async def admin_add_member(
    payload: AddMemberRequest,
    session: dict[str, Any] = Depends(require_company_admin),
):
    member = await add_company_member(
        _require_company_id(session),
        payload.email,
        {
            "name": payload.name,
            "position": payload.position,
            "department": payload.department,
        },
    )
    if not member:
        raise HTTPException(status_code=409, detail="사용자를 찾을 수 없거나 이미 팀원입니다.")
    return {"status": "success", "member": member}


@router.delete("/admin/members/{user_id}")
async def admin_remove_member(
    user_id: int, session: dict[str, Any] = Depends(require_company_admin)
):
    if not await remove_company_member(_require_company_id(session), user_id):
        raise HTTPException(status_code=404, detail="제거할 팀원을 찾을 수 없습니다.")
    return {"status": "success"}


@router.get("/admin/join-requests")
async def admin_join_requests(session: dict[str, Any] = Depends(require_company_admin)):
    return {"status": "success", "requests": await list_join_requests(_require_company_id(session))}


@router.patch("/admin/join-requests/{request_id}")
async def admin_process_join_request(
    request_id: int,
    payload: ProcessJoinRequest,
    session: dict[str, Any] = Depends(require_company_admin),
):
    company_id = None if session["role"] == "SYSTEM_ADMIN" else _require_company_id(session)
    changed = await process_join_request(
        request_id,
        int(session["user_id"]),
        payload.action == "APPROVE",
        company_id,
    )
    if not changed:
        raise HTTPException(status_code=404, detail="처리할 가입 신청을 찾을 수 없습니다.")
    return {"status": "success"}


@router.get("/admin/projects")
async def admin_projects(session: dict[str, Any] = Depends(require_company_admin)):
    return {
        "status": "success",
        "projects": await list_company_projects(_require_company_id(session)),
    }


@router.put("/projects/{project_id}")
async def dashboard_update_project(
    project_id: str,
    payload: UpdateProjectRequest,
    session: dict[str, Any] = Depends(verify_session),
):
    project = await get_project(project_id)
    if not project:
        raise HTTPException(status_code=404, detail="프로젝트를 찾을 수 없습니다.")
    if not _can_edit_project(session, project):
        raise HTTPException(status_code=403, detail="프로젝트 수정 권한이 없습니다.")
    data = payload.model_dump()
    # 시작이 종료보다 뒤면 남는 구간이 없다 — B02 등록과 같은 규칙 (2026-09-04 사용자 지시).
    start_m, end_m = data.get("route_start_m"), data.get("route_end_m")
    if start_m is not None and end_m is not None and start_m >= end_m:
        raise HTTPException(
            status_code=400,
            detail="노선 시작 누가거리는 종료 누가거리보다 작아야 합니다.",
        )
    await check_project_refs(int(project["company_id"]), data)
    if not await update_project(project_id, data, int(session["user_id"])):
        raise HTTPException(status_code=404, detail="프로젝트를 찾을 수 없습니다.")
    return {"status": "success"}


@router.delete("/projects/{project_id}")
async def dashboard_delete_project(
    project_id: str,
    session: dict[str, Any] = Depends(verify_session),
):
    project = await get_project(project_id)
    if not project:
        raise HTTPException(status_code=404, detail="프로젝트를 찾을 수 없습니다.")

    # 회사 관리자는 자기 회사 프로젝트를 지운다 (2026-09-06 사용자 확정).
    can_del = session["role"] == "SYSTEM_ADMIN" or (
        session["role"] == "ADMIN" and _same_company(session, project.get("company_id"))
    )
    if not can_del:
        raise HTTPException(status_code=403, detail="프로젝트 삭제 권한이 없습니다.")

    # 개발 PC에서만 하드 삭제. 배포 기본값은 지금까지처럼 소프트 삭제다.
    delete_project = hard_delete_project if PROJECT_DELETE_HARD_ENABLED else soft_delete_project
    if not await delete_project(project_id, int(session["user_id"])):
        raise HTTPException(status_code=404, detail="프로젝트를 찾을 수 없습니다.")
    return {"status": "success"}


@router.get("/admin/companies")
async def system_companies(session: dict[str, Any] = Depends(require_system_admin)):
    _ = session
    return {"status": "success", "companies": await list_all_companies()}


@router.post("/admin/companies")
async def system_create_company(
    payload: CreateCompanyRequest,
    session: dict[str, Any] = Depends(require_system_admin),
):
    result = await create_company(int(session["user_id"]), payload.model_dump())
    return {"status": "success", **result}


@router.get("/admin/users")
async def system_users(session: dict[str, Any] = Depends(require_system_admin)):
    _ = session
    return {"status": "success", "users": await list_all_users()}


@router.patch("/admin/users/{user_id}/role")
async def system_change_role(
    user_id: int,
    payload: ChangeUserRoleRequest,
    session: dict[str, Any] = Depends(require_company_admin),
):
    target = await get_user_admin_target(user_id)
    if not target:
        raise HTTPException(status_code=404, detail="사용자를 찾을 수 없습니다.")
    # 회사 관리자는 자기 회사 사람만 (2026-09-06 사용자 확정). 시스템관리자는 전역이다.
    if session["role"] != "SYSTEM_ADMIN" and not _same_company(session, target.get("company_id")):
        raise HTTPException(status_code=403, detail="다른 회사 사용자는 바꿀 수 없습니다.")
    if payload.role == "SYSTEM_ADMIN" or target["role"] == "SYSTEM_ADMIN":
        raise HTTPException(
            status_code=403,
            detail="시스템 관리자 역할은 시스템 관리 회사 소속 여부로 정해집니다.",
        )
    # 회사에 관리자가 하나도 남지 않게 되는 강등은 막는다 (본인 강등 포함).
    if (
        target["role"] == "ADMIN"
        and payload.role != "ADMIN"
        and target.get("company_id")
        and await count_company_admins(int(target["company_id"])) <= 1
    ):
        raise HTTPException(
            status_code=409,
            detail="회사에 관리자가 한 명뿐입니다. 다른 관리자를 먼저 지정하십시오.",
        )
    if not await change_user_role(user_id, payload.role):
        raise HTTPException(status_code=404, detail="사용자를 찾을 수 없습니다.")
    return {"status": "success"}


@router.put("/admin/users/{user_id}")
async def admin_update_user(
    user_id: int,
    payload: AdminUpdateUserRequest,
    session: dict[str, Any] = Depends(verify_session),
):
    target = await get_user_admin_target(user_id)
    if not target:
        raise HTTPException(status_code=404, detail="사용자를 찾을 수 없습니다.")
    if not _can_edit_user(session, target):
        raise HTTPException(status_code=403, detail="사용자 수정 권한이 없습니다.")
    data = payload.model_dump()
    if session["role"] == "USER":
        data["status"] = None
    if not await update_admin_user(user_id, data):
        raise HTTPException(status_code=404, detail="사용자를 찾을 수 없습니다.")
    return {"status": "success"}


@router.patch("/admin/users/{user_id}/company")
async def system_assign_company(
    user_id: int,
    payload: AssignCompanyRequest,
    session: dict[str, Any] = Depends(require_system_admin),
):
    _ = session
    if not await assign_user_company(user_id, payload.company_id):
        raise HTTPException(status_code=404, detail="사용자를 찾을 수 없습니다.")
    return {"status": "success"}


@router.get("/admin/join-requests-all")
async def system_join_requests(session: dict[str, Any] = Depends(require_system_admin)):
    _ = session
    return {"status": "success", "requests": await list_join_requests()}


@router.patch("/admin/join-requests/{request_id}/approve")
async def system_approve_join_request(
    request_id: int,
    session: dict[str, Any] = Depends(require_system_admin),
):
    if not await process_join_request(request_id, int(session["user_id"]), True):
        raise HTTPException(status_code=404, detail="처리할 가입 신청을 찾을 수 없습니다.")
    return {"status": "success"}


@router.get("/admin/audit-logs")
async def system_audit_logs(
    page: int = Query(1, ge=1),
    limit: int = Query(50, ge=1, le=100),
    session: dict[str, Any] = Depends(require_system_admin),
):
    _ = session
    return {"status": "success", **await list_audit_logs(limit, (page - 1) * limit)}


@router.get("/admin/resources")
async def system_resources(
    days: int = Query(30, ge=1, le=90),
    session: dict[str, Any] = Depends(require_system_admin),
):
    _ = session
    return {"status": "success", **await get_system_resources(days)}


@router.get("/admin/projects-all")
async def system_projects(session: dict[str, Any] = Depends(require_system_admin)):
    _ = session
    return {"status": "success", "projects": await list_all_projects()}


# ---- 회사 공유 도면 자산(로고·서명) — 회사 구성원 누구나 작성·수정, 시스템관리자는 전체 ----


@router.get("/company/assets")
async def company_assets(
    company_id: int | None = Query(None, gt=0),
    session: dict[str, Any] = Depends(verify_session),
):
    return {
        "status": "success",
        "assets": await list_company_assets(_scope_company(session, company_id)),
    }


@router.post("/company/assets")
async def company_add_asset(
    kind: str = Form(...),
    label: str = Form(...),
    user_id: int | None = Form(None, gt=0),
    company_id: int | None = Form(None, gt=0),
    file: UploadFile = File(...),
    session: dict[str, Any] = Depends(verify_session),
):
    kind = kind.upper()
    if kind not in ASSET_KINDS:
        raise HTTPException(status_code=400, detail="자산 종류는 LOGO 또는 SIGNATURE 입니다.")
    label = label.strip()[:100]
    if not label:
        raise HTTPException(status_code=400, detail="이름을 넣어 주세요.")
    suffix = os.path.splitext(file.filename or "")[1].lower()
    if suffix not in ASSET_EXTENSIONS:
        raise HTTPException(status_code=400, detail="png·jpg·webp·svg 그림만 올릴 수 있습니다.")
    blob = await file.read()
    if not blob or len(blob) > ASSET_MAX_BYTES:
        raise HTTPException(status_code=400, detail="그림은 2MB 이하여야 합니다.")
    scoped = _scope_company(session, company_id)
    if user_id and user_id not in {m["id"] for m in await list_company_members(scoped)}:
        raise HTTPException(status_code=400, detail="주인은 같은 회사 구성원이어야 합니다.")
    path = write_company_asset_file(scoped, kind, suffix, blob)
    asset_id = await create_company_asset(
        scoped, kind, label, path, user_id, int(session["user_id"])
    )
    return {"status": "success", "asset_id": asset_id}


@router.put("/company/assets/{asset_id}")
async def company_update_asset(
    asset_id: int,
    payload: UpdateCompanyAssetRequest,
    session: dict[str, Any] = Depends(verify_session),
):
    await _company_asset(session, asset_id)
    await update_company_asset(asset_id, payload.label.strip(), payload.user_id)
    return {"status": "success"}


@router.delete("/company/assets/{asset_id}")
async def company_delete_asset(asset_id: int, session: dict[str, Any] = Depends(verify_session)):
    await _company_asset(session, asset_id)
    await delete_company_asset(asset_id)
    return {"status": "success"}


@router.put("/company/logo")
async def company_set_logo(
    payload: UpdateCompanyLogoRequest,
    company_id: int | None = Query(None, gt=0),
    session: dict[str, Any] = Depends(require_company_admin),
):
    """회사 대표 로고를 지정·변경한다 (2026-09-02 사용자 확정).

    프로젝트가 따로 고르지 않으면 도면은 이 로고를 쓴다.
    """
    scoped = _scope_company(session, company_id)
    if payload.logo_asset_id is not None:
        asset = await get_company_asset(payload.logo_asset_id)
        if not asset or asset["company_id"] != scoped or asset["kind"] != "LOGO":
            raise HTTPException(status_code=400, detail="같은 회사의 로고 자산이어야 합니다.")
    if not await set_company_logo(scoped, payload.logo_asset_id):
        raise HTTPException(status_code=404, detail="회사를 찾을 수 없습니다.")
    return {"status": "success"}


@router.get("/company/assets/{asset_id}/file")
async def company_asset_file(asset_id: int, session: dict[str, Any] = Depends(verify_session)):
    """목록 미리보기용 그림. 도면에는 B07 이 같은 파일을 data URL 로 심는다."""
    asset = await _company_asset(session, asset_id)
    blob = read_stored_asset(asset["file_path"])
    if blob is None:
        raise HTTPException(status_code=404, detail="그림 파일이 없습니다.")
    media_type = mimetypes.guess_type(asset["file_path"])[0] or "application/octet-stream"
    return Response(content=blob, media_type=media_type)