from __future__ import annotations

from pathlib import Path

from fastapi import APIRouter, Depends, HTTPException, Query

from ..auth import verify_admin_auth
from ..config import (
    ACCOUNTS_PATH,
    ADMIN_TASKS_PATH,
    CLASSNOTES_PATH,
    COURSE_SUMMARIES_ROOT,
    OPERATION_LOGS_PATH,
    write_lock,
)
from ..data import (
    append_operation_log,
    approve_admin_task,
    delete_course_summary,
    list_admin_tasks,
    list_operation_logs,
    migrate_operation_log_labels,
    query_course_summaries,
    reject_admin_task,
    rollback_operation_log,
    update_course_summary_time,
)


router = APIRouter()


def rollback_backup_paths() -> list[Path]:
    return [
        CLASSNOTES_PATH,
        ACCOUNTS_PATH,
        ADMIN_TASKS_PATH,
        COURSE_SUMMARIES_ROOT,
        OPERATION_LOGS_PATH,
    ]


@router.get("/api/admin/tasks")
def admin_tasks(
    status_filter: str = Query("", alias="status"),
    task_type: str = Query("", alias="type"),
    _user: str = Depends(verify_admin_auth),
):
    try:
        return list_admin_tasks(ADMIN_TASKS_PATH, status_filter=status_filter, task_type=task_type)
    except ValueError as exc:
        raise HTTPException(status_code=500, detail=str(exc)) from exc


@router.get("/api/admin/operation-logs")
def admin_operation_logs(
    limit: int = Query(100, ge=1, le=500),
    operation: str = Query(""),
    status_filter: str = Query("", alias="status"),
    student: str = Query(""),
    _user: str = Depends(verify_admin_auth),
):
    migrate_operation_log_labels(OPERATION_LOGS_PATH)
    return list_operation_logs(
        OPERATION_LOGS_PATH,
        limit=limit,
        operation=operation,
        status_filter=status_filter,
        student=student,
        backup_paths=rollback_backup_paths(),
    )


@router.post("/api/admin/operation-logs/{log_id}/rollback")
def admin_rollback_operation_log(log_id: str, _user: str = Depends(verify_admin_auth)):
    try:
        with write_lock:
            result = rollback_operation_log(OPERATION_LOGS_PATH, log_id, rollback_backup_paths())
            append_operation_log(
                OPERATION_LOGS_PATH,
                "撤回操作",
                "已撤回",
                target_log_id=log_id,
                target_backup_id=str(result.get("target_backup_id") or ""),
                backup_id=str(result.get("backup_id") or ""),
                restored_files=result.get("restored_files") or [],
            )
    except ValueError as exc:
        raise HTTPException(status_code=409, detail=str(exc)) from exc
    return {"ok": True, **result}


@router.get("/api/admin/course-summaries")
def admin_course_summaries(
    q: str = Query(""),
    student: str = Query(""),
    teacher: str = Query(""),
    subject: str = Query(""),
    date_from: str = Query(""),
    date_to: str = Query(""),
    missing_time: bool = Query(False),
    limit: int = Query(200, ge=1, le=1000),
    _user: str = Depends(verify_admin_auth),
):
    try:
        return query_course_summaries(
            COURSE_SUMMARIES_ROOT,
            q=q,
            student=student,
            teacher=teacher,
            subject=subject,
            date_from=date_from,
            date_to=date_to,
            missing_time=missing_time,
            limit=limit,
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@router.post("/api/admin/tasks/{task_id}/approve")
def admin_approve_task(task_id: int, _user: str = Depends(verify_admin_auth)):
    try:
        with write_lock:
            result = approve_admin_task(ADMIN_TASKS_PATH, CLASSNOTES_PATH, ACCOUNTS_PATH, task_id)
            task = result.get("task", {})
            append_operation_log(
                OPERATION_LOGS_PATH,
                "审核批准",
                "已批准",
                task_id=task_id,
                task_type=str(task.get("type") or ""),
                student=str(task.get("student") or task.get("corrected", {}).get("student") or ""),
                source_id=str(task.get("source_id") or ""),
                backup_id=str(result.get("backup_id") or task.get("backup_id") or ""),
            )
    except ValueError as exc:
        raise HTTPException(status_code=409, detail=str(exc)) from exc
    return {"ok": True, **result}


@router.post("/api/admin/tasks/{task_id}/reject")
def admin_reject_task(task_id: int, _user: str = Depends(verify_admin_auth)):
    try:
        with write_lock:
            task = reject_admin_task(ADMIN_TASKS_PATH, task_id)
            append_operation_log(
                OPERATION_LOGS_PATH,
                "审核驳回",
                "已驳回",
                task_id=task_id,
                task_type=str(task.get("type") or ""),
                student=str(task.get("student") or task.get("corrected", {}).get("student") or ""),
                source_id=str(task.get("source_id") or ""),
            )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    return {"ok": True, "task": task}


@router.post("/api/admin/course-summaries/{summary_id}/time")
def admin_update_course_summary_time(summary_id: str, payload: dict, _user: str = Depends(verify_admin_auth)):
    try:
        with write_lock:
            result = update_course_summary_time(COURSE_SUMMARIES_ROOT, summary_id, str(payload.get("time_range") or ""))
            append_operation_log(
                OPERATION_LOGS_PATH,
                "课程小结补齐时间",
                "已更新",
                summary_id=summary_id,
                time_range=str(payload.get("time_range") or ""),
                backup_id=str(result.get("backup_id") or ""),
            )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    return {"ok": True, **result}


@router.delete("/api/admin/course-summaries/{summary_id}")
def admin_delete_course_summary(summary_id: str, _user: str = Depends(verify_admin_auth)):
    try:
        with write_lock:
            result = delete_course_summary(COURSE_SUMMARIES_ROOT, summary_id)
            append_operation_log(
                OPERATION_LOGS_PATH,
                "课程小结删除",
                "已删除",
                summary_id=summary_id,
                backup_id=str(result.get("backup_id") or ""),
            )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    return {"ok": True, **result}