from django.utils import timezone

from apps.projects.models import ProjectUserRate
from apps.workspaces.models import HourlyRateHistory


def record_project_rate_history(*, project, user, hourly_rate, currency, effective_from=None):
    currency = currency.upper()
    effective_from = effective_from or timezone.now()
    latest = (
        HourlyRateHistory.objects.filter(
            workspace=project.workspace,
            project=project,
            user=user,
            scope=HourlyRateHistory.Scope.PROJECT,
            is_deleted=False,
        )
        .order_by("-effective_from", "-created_at")
        .first()
    )
    if latest and latest.hourly_rate == hourly_rate and latest.currency == currency:
        return latest
    return HourlyRateHistory.objects.create(
        workspace=project.workspace,
        project=project,
        user=user,
        scope=HourlyRateHistory.Scope.PROJECT,
        hourly_rate=hourly_rate,
        currency=currency,
        effective_from=effective_from,
        is_active=True,
    )


def get_current_project_user_rate(*, project, user):
    return (
        ProjectUserRate.objects.filter(
            project=project,
            user=user,
            is_active=True,
            is_deleted=False,
        )
        .order_by("-effective_from", "-updated_at")
        .first()
    )


def upsert_project_user_rate(*, project, user, hourly_rate, currency="USD"):
    currency = currency.upper()
    rate = (
        ProjectUserRate.all_objects.filter(
            project=project,
            user=user,
        )
        .order_by("-updated_at", "-created_at")
        .first()
    )

    effective_from = timezone.now()
    if rate:
        update_fields = []
        if rate.is_deleted:
            rate.restore()
        if rate.hourly_rate != hourly_rate:
            rate.hourly_rate = hourly_rate
            update_fields.append("hourly_rate")
        if rate.currency != currency:
            rate.currency = currency
            update_fields.append("currency")
        if not rate.is_active:
            rate.is_active = True
            update_fields.append("is_active")
        if update_fields:
            update_fields.append("updated_at")
            rate.save(update_fields=update_fields)
            record_project_rate_history(
                project=project,
                user=user,
                hourly_rate=rate.hourly_rate,
                currency=rate.currency,
                effective_from=effective_from,
            )
        return rate

    rate = ProjectUserRate.objects.create(
        project=project,
        user=user,
        hourly_rate=hourly_rate,
        currency=currency,
        effective_from=effective_from,
        is_active=True,
    )
    record_project_rate_history(
        project=project,
        user=user,
        hourly_rate=rate.hourly_rate,
        currency=rate.currency,
        effective_from=rate.effective_from,
    )
    return rate


def remove_project_user_rate(*, project, user):
    rate = get_current_project_user_rate(project=project, user=user)
    if not rate:
        return False
    rate.delete()
    return True