from django import forms
from django.contrib.auth import get_user_model, password_validation
from django.core.exceptions import ValidationError

from .models import Claim, Project

User = get_user_model()


class ClaimantForm(forms.Form):
    full_name = forms.CharField(max_length=255, label="Namn")
    email = forms.EmailField(label="E-post")
    account_number = forms.CharField(max_length=50, label="Kontonummer")


class ClaimLineForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if not self.is_bound:
            self.fields["currency"].initial = Claim.Currency.SEK
        self.fields["project"].queryset = Project.objects.filter(is_active=True).order_by("name")
        self.fields["project"].required = False

    class Meta:
        model = Claim
        fields = ["description", "amount", "currency", "project", "receipt"]
        labels = {
            "description": "Beskrivning",
            "amount": "Belopp",
            "currency": "Valuta",
            "project": "Evenemang/Projekt",
            "receipt": "Kvitto",
        }
        widgets = {
            "description": forms.Textarea(attrs={"rows": 3}),
        }


class ClaimDecisionForm(forms.Form):
    ACTION_APPROVE = "approve"
    ACTION_REJECT = "reject"
    ACTION_CHOICES = (
        (ACTION_APPROVE, "Godkänn"),
        (ACTION_REJECT, "Neka"),
    )

    claim_id = forms.IntegerField(widget=forms.HiddenInput)
    action = forms.ChoiceField(choices=ACTION_CHOICES)
    decision_note = forms.CharField(
        required=False,
        widget=forms.Textarea(attrs={"rows": 2, "placeholder": "Kommentar"}),
    )

    def clean(self):
        cleaned = super().clean()
        action = cleaned.get("action")
        note = cleaned.get("decision_note", "").strip()
        if action == self.ACTION_REJECT and not note:
            self.add_error("decision_note", "Kommentar krävs när du nekar ett utlägg.")
        return cleaned


class UserManagementForm(forms.Form):
    username = forms.CharField(max_length=150, label="Användarnamn")
    email = forms.EmailField(required=False, label="E-post")
    first_name = forms.CharField(max_length=150, required=False, label="Förnamn")
    last_name = forms.CharField(max_length=150, required=False, label="Efternamn")
    password1 = forms.CharField(widget=forms.PasswordInput, label="Lösenord")
    password2 = forms.CharField(widget=forms.PasswordInput, label="Bekräfta lösenord")
    is_staff = forms.BooleanField(required=False, initial=True, label="Administratör (staff)")
    grant_view = forms.BooleanField(required=False, initial=True, label="Ge behörighet att se utlägg")
    grant_change = forms.BooleanField(required=False, initial=True, label="Ge behörighet att besluta utlägg")

    def clean_username(self):
        username = self.cleaned_data["username"]
        if User.objects.filter(username=username).exists():
            raise forms.ValidationError("Användarnamnet är upptaget.")
        return username

    def clean(self):
        cleaned = super().clean()
        if cleaned.get("password1") != cleaned.get("password2"):
            self.add_error("password2", "Lösenorden matchar inte.")
        password = cleaned.get("password1")
        if password:
            temp_user = User(
                username=cleaned.get("username", ""),
                email=cleaned.get("email", ""),
                first_name=cleaned.get("first_name", ""),
                last_name=cleaned.get("last_name", ""),
            )
            try:
                password_validation.validate_password(password, temp_user)
            except ValidationError as exc:
                self.add_error("password1", exc)
        return cleaned


class UserPermissionForm(forms.Form):
    user_id = forms.IntegerField(widget=forms.HiddenInput)
    is_staff = forms.BooleanField(required=False, label="Admin/staff")
    grant_view = forms.BooleanField(required=False, label="Får se utlägg")
    grant_change = forms.BooleanField(required=False, label="Får besluta utlägg")


class DeleteUserForm(forms.Form):
    user_id = forms.IntegerField(widget=forms.HiddenInput)