from django.db import models
from django.utils.translation import gettext_lazy as _

import uuid

from accounts.models import CustomUser
from events.models import Event
from events.scoping import EventScopedManager
from games.models import EventGame


class OCRStatus(models.TextChoices):
    TO_PROCESS = "to_process", _("To Process")
    PROCESSING = "processing", _("Processing")
    PROCESSED = "processed", _("Processed")
    ERROR = "error", _("Error processing")


def submission_file_upload_path(instance: "SubmissionFile", filename: str):
    ext = filename.split(".")[-1] if "." in filename else ""

    new_filename = f"{instance.id}_{filename}" if ext else str(instance.id)
    user = instance.submission.user.username
    game_path = instance.submission.scope.event_game.game.path
    event_path = instance.submission.scope.event_game.event.path
    mid = (
        instance.submission.scope.external_id
        if instance.submission.scope.external_id
        else instance.submission.scope.name
    )

    return f"{event_path.lstrip('/')}/{game_path.lstrip('/')}/{mid}/{user}/{instance.submission.id}/{new_filename}"


class BaseModel(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

    # Timestamps
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        abstract = True


class Scope(BaseModel):
    """A "match" that submissions can be scored against.

    Scopes are either created manually (admin/CLI) or auto-synced from the
    legacy PolyLAN AAndT API (see submissions.services.aandt_sync), in which
    case `external_id` holds the remote match id for idempotent upserts.
    """

    event_game = models.ForeignKey(
        EventGame,
        on_delete=models.CASCADE,
        related_name="scopes",
    )

    external_id = models.PositiveIntegerField(
        null=True,
        blank=True,
        help_text="Legacy AAndT match id, set when synced automatically.",
    )

    name = models.CharField(max_length=255)

    assigned_users = models.ManyToManyField(
        CustomUser,
        blank=True,
        related_name="scopes",
        help_text="Users allowed to submit scores for this scope.",
    )

    is_active = models.BooleanField(
        default=True,
        help_text="Whether submissions are currently accepted for this scope.",
    )

    synced_at = models.DateTimeField(
        null=True,
        blank=True,
        help_text="Last time this scope was synced from the AAndT API.",
    )

    class Meta:
        ordering = ["-created_at"]
        constraints = [
            models.UniqueConstraint(
                fields=["event_game", "external_id"],
                condition=models.Q(external_id__isnull=False),
                name="unique_scope_external_id_per_event_game",
            ),
        ]

    def __str__(self) -> str:
        return f"{self.name} ({self.event_game})"


class Submission(BaseModel):
    event = models.ForeignKey(
        Event,
        on_delete=models.CASCADE,
        related_name="submissions",
    )

    scope = models.ForeignKey(
        Scope,
        on_delete=models.CASCADE,
        related_name="submissions",
        help_text="The match this submission's score is for.",
    )

    user = models.ForeignKey(
        CustomUser,
        on_delete=models.CASCADE,
        null=True,
        blank=True,
        help_text="User who made the submission (null for anonymous)",
        related_name="user_submissions",
    )

    # Submission metadata
    notes = models.TextField(
        null=True,
        blank=True,
        help_text="Optional notes about the submission",
    )

    objects = models.Manager()
    for_event = EventScopedManager()


class SubmissionFile(BaseModel):
    submission = models.ForeignKey(
        Submission,
        on_delete=models.CASCADE,
        related_name="files",
    )

    file = models.FileField(
        upload_to=submission_file_upload_path,
        help_text=_("Uploaded file"),
    )

    original_filename = models.CharField(
        max_length=255,
        help_text=_("Original filename as uploaded by user"),
    )
    file_size = models.PositiveIntegerField(help_text=_("File size in bytes"))
    content_type = models.CharField(
        max_length=100,
        help_text=_("MIME type of the file"),
    )

    # OCR metadata
    ocr_status = models.CharField(
        max_length=20,
        choices=OCRStatus.choices,
        default=OCRStatus.TO_PROCESS,
        help_text=_("OCR processing status for the entire file"),
    )
    ocr_raw_data = models.TextField(
        blank=True,
        help_text=_("Raw OCR data for the entire file"),
    )

    class Meta:
        ordering = ["file", "created_at"]
        verbose_name = "Submission File"
        verbose_name_plural = "Submission Files"

    @property
    def file_url(self) -> str | None:
        if self.file:
            return self.file.url

    def save(self, *args, **kwargs):
        if self.file and not self.file_size:
            self.file_size = self.file.size

        super().save(*args, **kwargs)


class ImageCrop(BaseModel):
    submission_file = models.ForeignKey(
        SubmissionFile,
        on_delete=models.CASCADE,
        related_name="crops",
    )

    # Crop coordinates (pixels): x1, y1, x2, y2
    x1 = models.PositiveIntegerField(help_text=_("Top-left x coordinate"))
    y1 = models.PositiveIntegerField(help_text=_("Top-left y coordinate"))
    x2 = models.PositiveIntegerField(help_text=_("Bottom-right x coordinate"))
    y2 = models.PositiveIntegerField(help_text=_("Bottom-right y coordinate"))

    # Label/name for the crop
    label = models.CharField(
        max_length=255,
        blank=True,
        help_text=_("Optional label for this crop region"),
    )

    # OCR results for this crop
    ocr_status = models.CharField(
        max_length=20,
        choices=OCRStatus.choices,
        default=OCRStatus.TO_PROCESS,
        help_text=_("OCR processing status for this crop"),
    )
    ocr_raw_data = models.TextField(
        blank=True,
        help_text=_("Raw OCR data for this crop"),
    )

    class Meta:
        ordering = ["created_at"]
        verbose_name = "Image Crop"
        verbose_name_plural = "Image Crops"

    def __str__(self):
        return f"{self.label or f'Crop ({self.x1}, {self.y1}, {self.x2}, {self.y2})'}"