"""Vuelve a correr los comandos que aparecen en los apuntes y en las diapositivas
y comprueba que el código citado existe de verdad en esta carpeta."""
import pathlib
import re
import subprocess
import unittest

HERE = pathlib.Path(__file__).parent
ROOT = HERE.parent.parent
NOTES = ROOT / "notes" / "week-10.md"
SLIDES = ROOT / "slides" / "week-10.tex"
# Antes de un bloque cuya salida cambia con el sistema (informes de una caída, direcciones). No se compara.
SYSTEM_DEPENDENT = "<!-- depende del sistema -->"
# Antes de un bloque que muestra lo que escribe el laboratorio terminado: se corre con la solución.
SOLUTION_OUTPUT = "<!-- salida con la solución -->"


def normalize(text):
    # Según el idioma del entorno, gcc usa comillas tipográficas o rectas.
    return text.replace("‘", "'").replace("’", "'")


def run_shell(command):
    done = subprocess.run(
        ["bash", "-c", command], cwd=HERE, text=True, encoding="utf-8", errors="replace",
        stdout=subprocess.PIPE, stderr=subprocess.STDOUT, timeout=60,
    )
    return normalize(done.stdout)


def clean_lines(text):
    return [line.rstrip() for line in text.splitlines()]


def split_commands(lines):
    """Parte un bloque de terminal en pares (comando, líneas de salida)."""
    pairs = []
    for line in lines:
        if line.startswith("$ "):
            pairs.append((line[2:], []))
        elif pairs:
            pairs[-1][1].append(normalize(line.rstrip()))
    return pairs


def note_blocks(language):
    """Devuelve (líneas, marca) de cada bloque de los apuntes."""
    blocks, current, mark, previous = [], None, "", ""
    for raw in NOTES.read_text(encoding="utf-8").splitlines():
        line = re.sub(r"^> ?", "", raw)
        if current is None:
            if line.strip() == "```" + language:
                current, mark = [], previous.strip()
            elif line.strip():
                previous = line
        elif line.strip() == "```":
            blocks.append((current, mark))
            current = None
        else:
            current.append(line)
    return blocks


def slide_blocks(environments):
    text = SLIDES.read_text(encoding="utf-8")
    pattern = r"\\begin\{(?:%s)\}[^\n]*\n(.*?)\\end\{(?:%s)\}" % (environments, environments)
    return [match.group(1).splitlines() for match in re.finditer(pattern, text, re.S)]


def known_code_lines():
    lines = set()
    sources = list(HERE.glob("*.c")) + list(HERE.glob("*.h")) + list((HERE / "errors").glob("*.c"))
    sources += list((HERE / "lab").glob("*.c")) + list((HERE / "lab").glob("*.h"))
    for source in sources:
        lines.update(line.strip() for line in source.read_text(encoding="utf-8").splitlines())
    return lines


class NotesAreTrue(unittest.TestCase):
    @unittest.skipUnless(NOTES.exists(), "faltan los apuntes")
    def test_terminal_blocks_in_notes(self):
        checked = 0
        for lines, mark in note_blocks("text"):
            if not lines or not lines[0].startswith("$ ") or mark in (SYSTEM_DEPENDENT, SOLUTION_OUTPUT):
                continue
            for command, expected in split_commands(lines):
                checked += 1
                with self.subTest(command=command):
                    self.assertEqual(clean_lines(run_shell(command)), expected)
        self.assertGreater(checked, 8)

    @unittest.skipUnless(NOTES.exists(), "faltan los apuntes")
    def test_code_blocks_in_notes_exist(self):
        known = known_code_lines()
        for lines, _ in note_blocks("c"):
            for line in lines:
                if line.strip() and line.strip() != "...":
                    with self.subTest(line=line):
                        self.assertIn(line.strip(), known)

    @unittest.skipUnless(NOTES.exists() and (HERE / "solution").exists(), "falta la solución")
    def test_solution_output_in_notes(self):
        checked = 0
        for lines, mark in note_blocks("text"):
            if mark != SOLUTION_OUTPUT:
                continue
            for command, expected in split_commands(lines):
                # Los apuntes muestran el comando de ustedes; aquí se corre con la solución.
                actual = clean_lines(run_shell(command.replace("build/lab/", "build/solution/")))
                checked += 1
                with self.subTest(command=command):
                    self.assertEqual(actual, expected)
        self.assertGreater(checked, 1)


class SlidesAreTrue(unittest.TestCase):
    @unittest.skipUnless(SLIDES.exists(), "faltan las diapositivas")
    def test_terminal_blocks_in_slides(self):
        # Los informes de una caída van en otro entorno, informe, que no se compara.
        for block in slide_blocks("terminal|salida|salidalarga"):
            for command, expected in split_commands(block):
                actual = clean_lines(run_shell(command))
                position = 0
                # Una diapositiva puede omitir líneas, pero no cambiarlas ni reordenarlas.
                for line in expected:
                    line = line.strip()
                    if not line:
                        continue
                    with self.subTest(command=command, line=line):
                        found = [i for i in range(position, len(actual)) if actual[i].strip() == line]
                        self.assertTrue(found, f"no aparece en la salida real: {line}")
                        if found:
                            position = found[0] + 1

    @unittest.skipUnless(SLIDES.exists(), "faltan las diapositivas")
    def test_code_blocks_in_slides_exist(self):
        known = known_code_lines()
        for block in slide_blocks("codigo|codigochico|codigomini"):
            for line in block:
                if line.strip() and line.strip() != "...":
                    with self.subTest(line=line):
                        self.assertIn(line.strip(), known)


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