# Copyright (C) Ivan Kravets <me@ikravets.com>
# See LICENSE for details.

import json
from glob import glob
from os import listdir, walk
from os.path import abspath, basename, expanduser, isdir, join, relpath

import bottle

from platformio import util


class ProjectGenerator(object):

    def __init__(self, project_dir, ide, board=None):
        self.project_dir = project_dir
        self.ide = ide
        self.board = board
        self._tplvars = {}

        self._gather_tplvars()

    @staticmethod
    def get_supported_ides():
        tpls_dir = join(util.get_source_dir(), "ide", "tpls")
        return sorted([d for d in listdir(tpls_dir)
                       if isdir(join(tpls_dir, d))])

    @util.memoized
    def get_project_env(self):
        data = {"env_name": "PlatformIO"}
        with util.cd(self.project_dir):
            config = util.get_project_config()
            for section in config.sections():
                if not section.startswith("env:"):
                    continue
                data = {"env_name": section[4:]}
                for k, v in config.items(section):
                    data[k] = v
                if self.board and self.board == data.get("board"):
                    break
        return data

    @util.memoized
    def get_project_build_data(self):
        envdata = self.get_project_env()
        if "env_name" not in envdata:
            return None
        result = util.exec_command(
            ["platformio", "run", "-t", "idedata", "-e", envdata['env_name'],
             "--project-dir", self.project_dir]
        )
        if result['returncode'] != 0 or '{"includes":' not in result['out']:
            return None

        output = result['out']
        try:
            start_index = output.index('\n{"includes":')
            stop_index = output.rindex('}')
            return json.loads(output[start_index + 1:stop_index + 1])
        except ValueError:
            pass

        return None

    def get_project_name(self):
        return basename(self.project_dir)

    def get_srcfiles(self):
        result = []
        with util.cd(self.project_dir):
            for root, _, files in walk(util.get_projectsrc_dir()):
                for f in files:
                    result.append(relpath(join(root, f)))
        return result

    def get_tpls(self):
        tpls_dir = join(util.get_source_dir(), "ide", "tpls", self.ide)
        return glob(join(tpls_dir, ".*.tpl")) + glob(join(tpls_dir, "*.tpl"))

    def generate(self):
        for tpl_path in self.get_tpls():
            file_name = basename(tpl_path)[:-4]
            with open(join(self.project_dir, file_name), "w") as f:
                f.write(self._render_tpl(tpl_path).encode("utf8"))

    def _render_tpl(self, tpl_path):
        content = ""
        with open(tpl_path) as f:
            content = f.read()
        return bottle.template(content, **self._tplvars)

    def _gather_tplvars(self):
        self._tplvars.update(self.get_project_env())

        build_data = self.get_project_build_data()

        self._tplvars.update({
            "project_name": self.get_project_name(),
            "includes": (build_data['includes']
                         if build_data and "includes" in build_data else []),
            "defines": (build_data['defines']
                        if build_data and "defines" in build_data else []),
            "srcfiles": self.get_srcfiles(),
            "user_home_dir": abspath(expanduser("~")),
            "project_dir": self.project_dir
        })