from django.db import models

from pygments.lexers import get_all_lexers, get_lexer_by_name
from pygments.styles import get_all_styles
from pygments.formatters.html import HtmlFormatter
from pygments import highlight



LEXERS = [item for item in get_all_lexers() if item[1]]
LANG_CHOICES = sorted([(item[1][0], item[0]) for item in LEXERS])
STYLE_CHOICES = sorted([(item, item) for item in get_all_styles()])

class Snippet(models.Model):
    created_at = models.DateTimeField(auto_now=True)
    title = models.CharField(max_length=100, blank=True, default="")
    code = models.TextField()
    line_numbers = models.BooleanField(default=False)
    language = models.CharField(choices=LANG_CHOICES, default="python", max_length=100)
    style = models.CharField(choices=STYLE_CHOICES, default="friendly", max_length=100)
    owner = models.ForeignKey("auth.User", related_name="snippets", on_delete=models.CASCADE)
    highlighted = models.TextField()

    class Meta:
        ordering = ["created_at"]

    def save(self, *args, **kwargs):
        lexer = get_lexer_by_name(self.language)
        line_nums = "table" if self.line_numbers else False 
        options = {"title": self.title} if self.title else {}
        formatter = HtmlFormatter(style=self.style, linenos=line_nums, full=True, **options)
        self.highlighted = highlight(self.code, lexer, formatter)
        super().save(*args, **kwargs)