"""Read-only serializers for profile payloads."""

from __future__ import annotations

from typing import Any

from rest_framework import serializers

from apps.profiles.models import Company, Education, Experience, Profile, School, Skill
from apps.profiles.privacy import mask_emails, mask_phones


class SkillSerializer(serializers.ModelSerializer):
    class Meta:
        model = Skill
        fields = ("id", "name", "slug", "profile_count")


class CompanySerializer(serializers.ModelSerializer):
    class Meta:
        model = Company
        fields = ("id", "name", "industry", "size", "founded", "website", "location_name")


class SchoolSerializer(serializers.ModelSerializer):
    class Meta:
        model = School
        fields = ("id", "name", "type", "location_name")


class ExperienceSerializer(serializers.ModelSerializer):
    company = CompanySerializer(read_only=True)

    class Meta:
        model = Experience
        fields = (
            "id", "title", "title_role", "title_sub_role", "levels", "company", "company_name",
            "start_date", "end_date", "start_year", "end_year", "is_primary", "location_name",
            "summary",
        )  # fmt: skip


class EducationSerializer(serializers.ModelSerializer):
    school = SchoolSerializer(read_only=True)

    class Meta:
        model = Education
        fields = (
            "id", "school", "school_name", "degrees", "majors", "minors", "gpa",
            "start_date", "end_date", "end_year",
        )  # fmt: skip


class PIIMixin:
    """Masks contact details unless the caller is allowed to see them."""

    def _can_view_pii(self) -> bool:
        request = self.context.get("request")  # type: ignore[attr-defined]
        user = getattr(request, "user", None)
        return bool(user and user.is_authenticated and user.can_view_pii)

    def get_emails(self, obj: Profile) -> list[dict[str, str]]:
        return obj.emails if self._can_view_pii() else mask_emails(obj.emails)

    def get_phone_numbers(self, obj: Profile) -> list[str]:
        return obj.phone_numbers if self._can_view_pii() else mask_phones(obj.phone_numbers)


class ProfileListSerializer(PIIMixin, serializers.ModelSerializer):
    """Compact representation used for result cards."""

    headline = serializers.CharField(read_only=True)
    company = serializers.CharField(source="current_company.name", default="", read_only=True)
    skills = serializers.SerializerMethodField()
    emails = serializers.SerializerMethodField()

    class Meta:
        model = Profile
        fields = (
            "id", "full_name", "headline", "job_title", "job_title_role", "seniority_levels",
            "company", "industry", "location_name", "location_country", "years_experience",
            "linkedin_url", "skills", "emails",
        )  # fmt: skip

    def get_skills(self, obj: Profile) -> list[str]:
        # ``prefetch_related`` in the view keeps this at one extra query total.
        return [link.skill.name for link in obj.profile_skills.all()[:10]]


class ProfileDetailSerializer(PIIMixin, serializers.ModelSerializer):
    headline = serializers.CharField(read_only=True)
    current_company = CompanySerializer(read_only=True)
    skills = serializers.SerializerMethodField()
    experiences = ExperienceSerializer(many=True, read_only=True)
    educations = EducationSerializer(many=True, read_only=True)
    emails = serializers.SerializerMethodField()
    phone_numbers = serializers.SerializerMethodField()
    pii_masked = serializers.SerializerMethodField()

    class Meta:
        model = Profile
        fields = (
            "id", "external_id", "full_name", "first_name", "last_name", "gender", "headline",
            "job_title", "job_title_role", "job_title_sub_role", "seniority_levels",
            "current_company", "industry", "job_summary", "job_start_date",
            "location_name", "location_locality", "location_region", "location_country",
            "location_continent", "summary", "years_experience", "inferred_salary",
            "connections", "interests", "languages", "linkedin_url", "linkedin_username",
            "github_url", "twitter_url", "skills", "experiences", "educations",
            "emails", "phone_numbers", "pii_masked",
        )  # fmt: skip

    def get_skills(self, obj: Profile) -> list[dict[str, Any]]:
        return [
            {"name": link.skill.name, "slug": link.skill.slug} for link in obj.profile_skills.all()
        ]

    def get_pii_masked(self, obj: Profile) -> bool:  # noqa: ARG002
        return not self._can_view_pii()