"""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-15.md"
SLIDES = ROOT / "slides" / "week-15.tex"
# Antes de un bloque cuya salida cambia con el sistema. Se corre, pero no se compara.
SYSTEM_DEPENDENT = "<!-- depende del sistema -->"
# Antes de un bloque que corre la solución: los estudiantes no tienen esa carpeta.
NEEDS_SOLUTION = "<!-- requiere la solucion -->"
HAS_SOLUTION = (HERE / "solution").is_dir()


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",
        stdin=subprocess.DEVNULL, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, timeout=120,
    )
    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("*.cpp")) + list(HERE.glob("*.h")) + list((HERE / "errors").glob("*.cpp"))
    sources += list((HERE / "lab").glob("*.h")) + list((HERE / "lab" / "tests").glob("*.cpp"))
    for source in sources:
        lines.update(line.strip() for line in source.read_text(encoding="utf-8").splitlines())
    return lines


class OutputCheck(unittest.TestCase):
    def assert_in_order(self, command, expected, actual):
        """Las líneas esperadas aparecen en la salida real, en orden. '...' marca un recorte."""
        wanted = [line.strip() for line in expected if line.strip() and line.strip() != "..."]
        real = [line.strip() for line in actual]
        position = 0
        for line in wanted:
            with self.subTest(command=command, line=line):
                found = [i for i in range(position, len(real)) if real[i] == line]
                self.assertTrue(found, f"no aparece en la salida real: {line}")
                if found:
                    position = found[0] + 1


class NotesAreTrue(OutputCheck):
    @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("$ "):
                continue
            if mark == NEEDS_SOLUTION and not HAS_SOLUTION:
                continue
            for command, expected in split_commands(lines):
                actual = clean_lines(run_shell(command))
                checked += 1
                if mark != SYSTEM_DEPENDENT:
                    with self.subTest(command=command):
                        self.assertEqual(actual, expected)
        self.assertGreater(checked, 5)

    @unittest.skipUnless(NOTES.exists(), "faltan los apuntes")
    def test_maps_are_credited_next_to_every_output(self):
        """Toda salida que usa un mapa lleva cerca el crédito. Las rutas, también el aviso de los sentidos."""
        text = NOTES.read_text(encoding="utf-8")
        for match in re.finditer(r"^\$ .*data/mapas", text, re.M):
            after = text[match.start():match.start() + 1600]
            self.assertIn("OpenStreetMap", after, match.group(0))
            if "route_demo" in match.group(0):
                self.assertIn("sentido", after)


class SlidesAreTrue(OutputCheck):
    @unittest.skipUnless(SLIDES.exists(), "faltan las diapositivas")
    def test_program_output_in_slides(self):
        for block in slide_blocks("terminal|salida"):
            for command, expected in split_commands(block):
                if "build/solution" in command and not HAS_SOLUTION:
                    continue
                self.assert_in_order(command, expected, clean_lines(run_shell(command)))

    @unittest.skipUnless(NOTES.exists() and SLIDES.exists(), "faltan los apuntes o las diapositivas")
    def test_measurements_in_slides_come_from_notes(self):
        """Los tiempos dependen de la máquina: las diapositivas copian los de los apuntes."""
        notes = NOTES.read_text(encoding="utf-8").splitlines()
        blocks = slide_blocks("medicion|medicionchica")
        self.assertGreaterEqual(len(blocks), 2)
        for block in blocks:
            for line in block:
                with self.subTest(line=line):
                    self.assertIn(line, notes)

    @unittest.skipUnless(SLIDES.exists(), "faltan las diapositivas")
    def test_maps_are_credited_in_slides(self):
        text = SLIDES.read_text(encoding="utf-8")
        self.assertIn("colaboradores de OpenStreetMap", text)
        self.assertIn("sentido de circulación", text)
        for frame in text.split("\\begin{frame}"):
            if "route\\_demo" in frame or "Miraflores" in frame and "medicion" in frame:
                self.assertIn("OpenStreetMap", frame.replace("creditomapa", "OpenStreetMap"))

    @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()