from typing import Dict, List, Any
import os

import yaml
import jinja2


def load_file(file: str) -> Any:
    print(f"loading {file}")
    with open(file, encoding="utf-8") as f:
        ymltxt = f.read()
    return yaml.safe_load(ymltxt)


def assert_dict(
    dct: Dict[str, Any], required_keys: List[str], optional_keys: List[str]
) -> List[str]:
    issues = []
    if not isinstance(dct, dict):
        raise RuntimeError(f"{dct} has to be a dict")
    for reqkey in required_keys:
        if reqkey not in dct:
            issues.append(f"{reqkey} is required")
    extraelems = [x for x in dct.keys() if x not in required_keys + optional_keys]
    if len(extraelems) != 0:
        issues.append(f"{extraelems} not allowed")
    return issues


def assert_type(dct: Dict[str, Any], key: str, type: type) -> List[str]:
    if key == "":
        if not isinstance(dct, type):
            return [f"{key} has to be a {type}"]
    elif key in dct and not isinstance(dct[key], type):
        return [f"{key} has to be a {type}"]
    return []


def validate_units(units: List[Any]) -> List[str]:
    if not isinstance(units, list):
        raise RuntimeError(f"{units} has to be a list")
    issues = []
    for unit in units:
        issues += assert_type(unit, "", str)
    return issues


def validate_ingredients(ingredients: Any) -> List[str]:
    if not isinstance(ingredients, list):
        raise RuntimeError(f"{ingredients} has to be a list")
    issues = []
    for ing in ingredients:
        issues += assert_dict(ing, ["name"], ["wdid"])
        issues += assert_type(ing, "name", str)
    return issues


def validate_recipe(recipe: Any, units: List[Any], ingredients: List[Any]) -> List[str]:
    issues = []
    issues += assert_dict(recipe, ["title", "ingredients", "steps"], [])

    issues += assert_type(recipe, "title", str)
    if not isinstance(recipe["ingredients"], list):
        raise RuntimeError(f'{recipe["ingredients"]} has to be a list')
    if not isinstance(recipe["steps"], list):
        raise RuntimeError(f'{recipe["steps"]} has to be a list')

    for ingredient in recipe["ingredients"]:
        issues += assert_dict(ingredient, ["name"], ["amount", "unit", "note"])
        issues += assert_type(ingredient, "name", str)
        if (
            "amount" in ingredient
            and not isinstance(ingredient["amount"], int)
            and not isinstance(ingredient["amount"], float)
        ):
            issues.append("each ingredient has to have a int or float amount")
        issues += assert_type(ingredient, "unit", str)
        issues += assert_type(ingredient, "note", str)
        if ingredient["name"] not in [ing["name"] for ing in ingredients]:
            issues.append(f"unknown ingredient {ingredient['name']}")

    for step in recipe["steps"]:
        if not isinstance(step, str):
            issues.append("each step has to be a string")
    return issues


def get_recipes(units: List[Any], ingredients: List[Any]) -> List[Any]:
    recipes = []
    for _, _, files in os.walk("recipes/recipes"):
        files.sort()
        for file in files:
            recipe = load_file("recipes/recipes/" + file)
            try:
                issues = validate_recipe(recipe, units, ingredients)
            except RuntimeError as e:
                print("WARNING:", e, "skipping")
                continue
            if len(issues) != 0:
                for issue in issues:
                    print("WARNING:", file, issue, "skipping")
                continue
            recipe["srcpath"] = file
            if not file.endswith(".yaml"):
                print(f"unknown extension of {file}")
                continue
            recipe["outpath"] = file[:-5] + ".html"
            recipes.append(recipe)
    return recipes


def rendertemplate(
    template: jinja2.Template, format: str, file: str, args: Any
) -> None:
    print(f"rendering {file}")
    outstr = template.render(args)

    try:
        os.mkdir("out")
    except FileExistsError:
        pass

    try:
        os.mkdir(f"out/{format}")
    except FileExistsError:
        pass

    with open(f"out/{format}/{file}", "w", encoding="utf-8") as f:
        f.write(outstr)


def main() -> None:
    issues = []
    units = load_file("recipes/units.yaml")
    issues += validate_units(units)

    ingredients = load_file("recipes/ingredients.yaml")
    issues += validate_ingredients(ingredients)

    if len(issues) != 0:
        for issue in issues:
            print("ERROR", issue)
        return

    recipes = get_recipes(units, ingredients)

    env = jinja2.Environment(
        loader=jinja2.FileSystemLoader("templates"),
        autoescape=jinja2.select_autoescape(),
    )

    indextemplate = env.get_template("index.html")
    rendertemplate(indextemplate, "html", "index.html", {"recipes": recipes})

    recipetemplate = env.get_template("recipe.html")
    for recipe in recipes:
        rendertemplate(recipetemplate, "html", recipe["outpath"], recipe)


if __name__ == "__main__":
    main()