import uuid
from django.db import models


class VendorConfig(models.Model):
    """
    Dynamic configuration for verification vendors stored in database.
    Allows toggling active state, priority adjustments, and credential updates via Django admin.
    """
    name = models.CharField(max_length=50, unique=True, help_text="Unique vendor identifier, e.g. codeplus")
    display_name = models.CharField(max_length=100, help_text="Human-readable name")
    is_active = models.BooleanField(default=True)
    priority = models.PositiveIntegerField(
        default=10,
        help_text="Waterfall execution order (lower numbers execute first)",
    )
    supported_documents = models.JSONField(
        default=list,
        help_text="List of supported doc types: ['pan', 'aadhaar', 'driving_license', 'voter_id', ...]",
    )
    base_url = models.CharField(max_length=255, blank=True, null=True)
    api_key = models.CharField(max_length=255, blank=True, null=True)
    extra_credentials = models.JSONField(default=dict, blank=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ["priority", "name"]
        verbose_name = "Vendor Configuration"
        verbose_name_plural = "Vendor Configurations"

    def __str__(self):
        return f"{self.display_name} ({self.name}) - Priority: {self.priority} - {'Active' if self.is_active else 'Disabled'}"


class VerificationTransaction(models.Model):
    """
    Master record of every document verification request processed by the engine.
    """
    STATUS_CHOICES = (
        ("PENDING", "Pending"),
        ("SUCCESS", "Success"),
        ("FAILED", "Failed"),
        ("ERROR", "Error"),
    )

    reference_id = models.UUIDField(default=uuid.uuid4, unique=True, editable=False, db_index=True)
    document_type = models.CharField(max_length=50, db_index=True)
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default="PENDING", db_index=True)
    successful_vendor = models.CharField(max_length=50, blank=True, null=True)
    input_payload = models.JSONField(default=dict, blank=True)
    final_data = models.JSONField(default=dict, blank=True)
    response_payload = models.JSONField(default=dict, blank=True)
    attempts_count = models.PositiveIntegerField(default=0)
    total_latency_ms = models.FloatField(default=0.0)
    created_at = models.DateTimeField(auto_now_add=True, db_index=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ["-created_at"]
        verbose_name = "Verification Transaction"
        verbose_name_plural = "Verification Transactions"

    def __str__(self):
        return f"[{self.status}] {self.document_type} - {self.reference_id} ({self.successful_vendor or 'none'})"


class VendorAttemptLog(models.Model):
    """
    Audit log of each individual vendor attempt in the waterfall cascade.
    Allows inspection of which vendor failed, why, latency, and full payload details.
    """
    transaction = models.ForeignKey(
        VerificationTransaction,
        related_name="attempts",
        on_delete=models.CASCADE,
    )
    attempt_number = models.PositiveIntegerField()
    vendor_name = models.CharField(max_length=50, db_index=True)
    status = models.CharField(max_length=20)
    is_success = models.BooleanField(default=False)
    data = models.JSONField(default=dict, blank=True)
    raw_response = models.JSONField(null=True, blank=True)
    error_code = models.CharField(max_length=100, blank=True, null=True)
    error_message = models.TextField(blank=True, null=True)
    latency_ms = models.FloatField(default=0.0)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        ordering = ["attempt_number"]
        verbose_name = "Vendor Attempt Log"
        verbose_name_plural = "Vendor Attempt Logs"

    def __str__(self):
        return f"Tx: {self.transaction.reference_id} | #{self.attempt_number} {self.vendor_name} -> {self.status}"


class PANDetails(models.Model):
    """
    Dedicated table storing granular fields from Detailed PAN verification
    for analysis, reporting, and KYC intelligence.
    """
    transaction = models.ForeignKey(
        VerificationTransaction,
        related_name="pan_details_record",
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        help_text="Associated verification transaction",
    )
    document_type = models.CharField(max_length=20, default="PAN", db_index=True)
    document_id = models.CharField(max_length=20, db_index=True, help_text="10-digit PAN Number (e.g. AVEPV5707G)")
    name = models.CharField(max_length=255, db_index=True, help_text="Full Name on PAN card")
    first_name = models.CharField(max_length=150, blank=True, null=True)
    last_name = models.CharField(max_length=150, blank=True, null=True)
    category = models.CharField(max_length=10, blank=True, null=True, help_text="PAN holder category (e.g. P for Person/Individual)")
    date_of_birth = models.CharField(max_length=50, blank=True, null=True, help_text="YYYY-MM-DD or DD/MM/YYYY")
    gender = models.CharField(max_length=20, blank=True, null=True)
    masked_aadhaar_number = models.CharField(max_length=30, blank=True, null=True, help_text="e.g. XXXXXXXX5139")
    aadhaar_linked = models.BooleanField(default=False, help_text="Whether Aadhaar is seeded/linked with PAN")
    taxpayer_profile = models.BooleanField(default=False, help_text="Active taxpayer profile flag")
    
    # Contact Info
    email = models.CharField(max_length=255, blank=True, null=True)
    phone = models.CharField(max_length=50, blank=True, null=True)

    # Address breakdown columns for regional & geographical analytics
    address_line_1 = models.CharField(max_length=255, blank=True, null=True)
    street = models.CharField(max_length=255, blank=True, null=True)
    city = models.CharField(max_length=150, blank=True, null=True, db_index=True)
    state = models.CharField(max_length=100, blank=True, null=True, db_index=True)
    pincode = models.CharField(max_length=20, blank=True, null=True, db_index=True)
    address_data = models.JSONField(default=dict, blank=True, null=True, help_text="Full structured address object")

    # API tracking & Complete JSON payloads for future data science & audit
    request_id = models.CharField(max_length=100, blank=True, null=True, db_index=True)
    vendor_txn_id = models.CharField(max_length=100, blank=True, null=True, db_index=True)
    full_response = models.JSONField(default=dict, blank=True, null=True, help_text="Entire uncompressed response payload from vendor")

    created_at = models.DateTimeField(auto_now_add=True, db_index=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        db_table = "pan_details"
        ordering = ["-created_at"]
        verbose_name = "PAN Detail"
        verbose_name_plural = "PAN Details"

    def __str__(self):
        return f"{self.document_id} - {self.name} ({self.city or 'Unknown'}, {self.state or 'Unknown'})"


class SellerBankVerification(models.Model):
    """
    Dedicated bank verification record for seller onboarding and settlements,
    keyed by seller_id as primary key.
    """
    seller_id = models.CharField(max_length=100, primary_key=True, help_text="Unique Seller / Supplier ID")
    transaction = models.ForeignKey(
        VerificationTransaction,
        related_name="seller_bank_verifications",
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        help_text="Associated verification transaction",
    )
    account_number = models.CharField(max_length=50)
    ifsc = models.CharField(max_length=20)
    account_ifsc = models.CharField(max_length=20, blank=True, null=True)
    beneficiary_name = models.CharField(max_length=255, blank=True, null=True)
    is_valid = models.BooleanField(default=False)
    account_exists = models.BooleanField(default=False)
    failure_reason = models.TextField(blank=True, null=True)
    npci_error_code = models.CharField(max_length=100, blank=True, null=True)
    tranx_id = models.CharField(max_length=100, blank=True, null=True, db_index=True)
    timestamp = models.CharField(max_length=100, blank=True, null=True)
    user_consent = models.CharField(max_length=50, default="true")
    vendor_name = models.CharField(max_length=50, default="codeplus")
    status = models.CharField(max_length=50, default="PENDING")
    latency_ms = models.FloatField(default=0.0)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        db_table = "seller_bank_verification"
        verbose_name = "Seller Bank Verification"
        verbose_name_plural = "Seller Bank Verifications"

    def __str__(self):
        return f"Seller {self.seller_id} Bank: {self.beneficiary_name or self.account_number} ({'Valid' if self.is_valid else 'Invalid'})"