# Chris Xiong 2024
# License: Expat (MIT)
#
# Basic unit tests for the Python Monolith class

import monolith
import unittest
import random
import os
from mmap import mmap

def randstr(len):
    return ''.join(random.choices(''.join([chr(i + ord('0')) for i in range(0, 75)]), k=len))

def randpost(last_time):
    content = randstr(random.randint(10, 1024))
    date = random.randint(last_time + 1, last_time + 999999)
    media = []
    tags = []
    for _ in range(0, random.randint(0, 9)):
        media.append(monolith.MediaInstance.makeImage(randstr(20), randstr(20)))
    for _ in range(0, random.randint(0, 4)):
        tags.append(randstr(random.randint(1, 8)))
    return monolith.Post(content, date, media, tags)

def posteq(a, b):
    if a is None or b is None:
        return False
    if len(a.media) != len(b.media) or len(a.tags) != len(b.tags):
        return False
    for x, y in zip(a.media, b.media):
        if x.thumbnail != y.thumbnail or x.original != y.original:
            return False
    for x, y in zip(a.tags, b.tags):
        if x != y: return False
    return a.content == b. content and a.date == b.date

class TestMonolith(unittest.TestCase):
    def test_replace(self):
        posts = []
        filename = "rep.monolith"
        m = monolith.Monolith(filename)
        p1 = randpost(123)
        p2 = randpost(p1.date)
        p3 = randpost(0)
        p3.date = p1.date
        m.append(p1)
        m.append(p2)
        m.replace_post(p1.date, p3)
        self.assertTrue(posteq(m.get_post(p3.date), p3))
        self.assertTrue(posteq(m.get_post(p2.date), p2))

    def test_combined(self):
        posts = []
        filename = "test.monolith"
        if True:
            m = monolith.Monolith(filename)
            last_time = 0
            for _ in range(0, 100):
                op = 1 if random.random() < 0.2 else 0
                if op == 1 and len(posts) == 0:
                    op = 0
                if op == 0:
                    p = randpost(last_time)
                    last_time = p.date
                    posts.append(p)
                    m.append(p)
                elif op == 1:
                    p = randpost(0)
                    position = random.randint(0, len(posts) - 1)
                    p.date = posts[position].date
                    posts[position] = p
                    m.replace_post(p.date, p)
            m.write_index()
            m.generate_page_index()
            for p in posts:
                pp = m.get_post(p.date)
                self.assertTrue(posteq(p, pp))

            with open(filename, "r+b") as f:
                d = mmap(f.fileno(), 0)
                for _, _, r in m.postranges:
                    self.assertEqual(d[r - 1 : r], b'\v')
        if True:
            m = monolith.Monolith(filename)
            m.load_index()
            dates = m.get_all_dates()
            self.assertEqual(len(dates), len(posts))
            for t, p in zip(dates, posts):
                self.assertEqual(t, p.date)
            for t, p in zip(dates, posts):
                self.assertTrue(posteq(p, m.get_post(t)))


if __name__ == "__main__":
    unittest.main()