from rest_framework import serializers
from .models import VendorConfig, VerificationTransaction, VendorAttemptLog


class VerifyDocumentRequestSerializer(serializers.Serializer):
    """Input payload serializer for document verification API."""
    document_type = serializers.CharField(
        required=True,
        help_text="Type of document, e.g. 'pan', 'aadhaar', 'driving_license', 'voter_id', 'bank_account', 'bank_verify_pd', 'gstin'",
    )
    data = serializers.DictField(
        required=True,
        help_text="Document verification attributes (e.g. pan_number, name, dob, etc.)",
    )
    business_name = serializers.CharField(
        required=False,
        allow_blank=True,
        allow_null=True,
        help_text="Optional legal entity or trade name of the business to match against GSTIN.",
    )
    preferred_vendor = serializers.CharField(
        required=False,
        allow_null=True,
        allow_blank=True,
        help_text="Optional vendor to prioritize at head of fallback waterfall (e.g. 'codeplus')",
    )


class VerifySellerPanGstRequestSerializer(serializers.Serializer):
    """Input payload for verifying a seller's identity via PAN and pulling linked GSTINs."""
    seller_name = serializers.CharField(
        required=True,
        help_text="Full legal name of the seller / owner to match against the government PAN card.",
    )
    pan = serializers.CharField(
        required=True,
        max_length=10,
        min_length=10,
        help_text="10-character Permanent Account Number (PAN).",
    )
    gstin = serializers.CharField(
        required=False,
        allow_blank=True,
        allow_null=True,
        max_length=15,
        help_text="Optional GSTIN entered by seller to cross-verify against linked GST records.",
    )
    business_name = serializers.CharField(
        required=False,
        allow_blank=True,
        allow_null=True,
        help_text="Optional legal entity or trade name of the business to match against GSTIN.",
    )
    preferred_vendor = serializers.CharField(
        required=False,
        allow_blank=True,
        allow_null=True,
        help_text="Optional vendor preference (defaults to waterfall order).",
    )


class VendorAttemptLogSerializer(serializers.ModelSerializer):
    class Meta:
        model = VendorAttemptLog
        fields = [
            "attempt_number",
            "vendor_name",
            "status",
            "is_success",
            "data",
            "raw_response",
            "error_code",
            "error_message",
            "latency_ms",
            "created_at",
        ]


class VerificationTransactionSerializer(serializers.ModelSerializer):
    attempts = VendorAttemptLogSerializer(many=True, read_only=True)

    class Meta:
        model = VerificationTransaction
        fields = [
            "reference_id",
            "document_type",
            "status",
            "successful_vendor",
            "final_data",
            "response_payload",
            "attempts_count",
            "total_latency_ms",
            "created_at",
            "attempts",
        ]


class VendorConfigSerializer(serializers.ModelSerializer):
    class Meta:
        model = VendorConfig
        fields = [
            "name",
            "display_name",
            "priority",
            "is_active",
            "supported_documents",
            "base_url",
            "updated_at",
        ]