from pydantic import BaseModel, EmailStr, Field
from typing import Optional, List, Dict, Any
from datetime import date, time, datetime


# ============ Auth ============
class LoginRequest(BaseModel):
    email: str
    password: str


class TokenResponse(BaseModel):
    access_token: str
    token_type: str = "bearer"


class UserResponse(BaseModel):
    id: int
    email: str
    name: str
    role: str

    class Config:
        from_attributes = True


# ============ Attendance ============
class AttendanceBase(BaseModel):
    employee_id: str
    employee_name: str
    department: Optional[str] = None
    date: date
    check_in: Optional[time] = None
    check_out: Optional[time] = None
    overtime_hours: float = 0
    leave_type: Optional[str] = None
    leave_hours: float = 0
    status: str
    remarks: Optional[str] = None
    custom_fields: Dict[str, Any] = {}


class AttendanceCreate(AttendanceBase):
    pass


class AttendanceUpdate(BaseModel):
    employee_id: Optional[str] = None
    employee_name: Optional[str] = None
    department: Optional[str] = None
    date: Optional[date] = None
    check_in: Optional[time] = None
    check_out: Optional[time] = None
    overtime_hours: Optional[float] = None
    leave_type: Optional[str] = None
    leave_hours: Optional[float] = None
    status: Optional[str] = None
    remarks: Optional[str] = None
    custom_fields: Optional[Dict[str, Any]] = None


class AttendanceResponse(AttendanceBase):
    id: int
    created_by: Optional[int] = None
    created_at: datetime
    updated_at: datetime

    class Config:
        from_attributes = True


# ============ Accident ============
class AccidentBase(BaseModel):
    date: date
    time: Optional[time] = None
    location: str
    employee_name: str
    employee_id: Optional[str] = None
    department: Optional[str] = None
    description: str
    severity: str
    medical_report: Optional[str] = None
    action_taken: Optional[str] = None
    responsible_person: Optional[str] = None
    custom_fields: Dict[str, Any] = {}


class AccidentCreate(AccidentBase):
    pass


class AccidentUpdate(BaseModel):
    date: Optional[date] = None
    time: Optional[time] = None
    location: Optional[str] = None
    employee_name: Optional[str] = None
    employee_id: Optional[str] = None
    department: Optional[str] = None
    description: Optional[str] = None
    severity: Optional[str] = None
    medical_report: Optional[str] = None
    action_taken: Optional[str] = None
    responsible_person: Optional[str] = None
    custom_fields: Optional[Dict[str, Any]] = None


class AccidentResponse(AccidentBase):
    id: int
    created_by: Optional[int] = None
    created_at: datetime
    updated_at: datetime

    class Config:
        from_attributes = True


# ============ Custom Fields ============
class CustomFieldBase(BaseModel):
    field_name: str
    field_type: str
    field_key: str
    required: bool = False
    options: List[str] = []
    order: int = 0


class CustomFieldCreate(CustomFieldBase):
    pass


class CustomFieldResponse(CustomFieldBase):
    id: int

    class Config:
        from_attributes = True


# ============ Dashboard ============
class AttendanceStats(BaseModel):
    total: int
    today: int
    this_month: int
    by_status: Dict[str, int]
    by_department: Dict[str, int]
    trend: List[Dict[str, Any]]


class AccidentStats(BaseModel):
    total: int
    this_month: int
    unresolved: int
    by_severity: Dict[str, int]
    recent: List[AccidentResponse]


# ============ Import ============
class ImportRequest(BaseModel):
    section: str  # "attendance" or "accident"
    update_existing: bool = True


class ImportResult(BaseModel):
    created: int
    updated: int
    skipped: int
    errors: List[str]


# ============ Pagination / Filter ============
class FilterParams(BaseModel):
    page: int = 1
    per_page: int = 20
    sort_by: Optional[str] = None
    sort_order: Optional[str] = "asc"  # asc or desc
    search: Optional[str] = None
    date_from: Optional[date] = None
    date_to: Optional[date] = None
    department: Optional[str] = None
    status: Optional[str] = None


class PaginatedResponse(BaseModel):
    items: List[Any]
    total: int
    page: int
    per_page: int
    total_pages: int