import os
import shutil
from command import Command
from config import Config
from cache import Cache
from seed import Seed
from target import Target
from env import Environment
from platform import Platform
from colorama import Fore, Style


class SetCommand(Command):
    def __init__(self):
        super().__init__(
                name='set',
                description='Set a configuration key value.')


    def run(self, args):
        key = args.get_positional(0)
        value = args.get_positional(1)

        if key is None or value is None:
            print('usage: meadow set <key> <value>')
            return -1

        try:
            value_i = int(value)
            Config.set(key, value_i)
        except:
            Config.set(key, value)

        return 0


class SeedsCommand(Command):
    def __init__(self):
        super().__init__(
                name='seeds',
                description='List all available seeds.')


    def write_dot(self, path):
        f = open(path, mode='w')
        f.write('digraph seeds {\n')
        f.write('    node [shape=Mrecord];\n')
        nodes = {}

        seeds = Seed.all_seeds()
        targets = Target.all_targets()
        for s in seeds.values():
            if s.name() in nodes:
                continue

            sname = s.name().replace('-', '_')
            nodes[s.name()] = s
            f.write('    {} [label="{}"];\n'.format(sname, s.name()))

            for d in s.dependencies().values():
                continue


        for t in targets.values():
            if t.name() in nodes:
                continue

            t.resolve()
            tname = t.name().replace('-', '_')
            nodes[t.name()] = t
            f.write('    {} [label="{}",shape=hexagon];\n'.format(tname, t.name()))

        for s in seeds.values():
            for k, d in s.dependencies().items():
                if d.name() not in nodes:
                    nodes[d.name()] = d
                    dname = d.name().replace('-', '_')
                    f.write('    {} [label="{}",shape=diamond];\n'.format(dname, d.name()))

                sname = s.name().replace('-', '_')
                dname = d.name().replace('-', '_')

                if d.is_resolved():
                    f.write('    {} -> {};\n'.format(dname, sname))
                else:
                    f.write('    {} -> {}[style=dotted];\n'.format(dname, sname))

        for t in targets.values():
            for k, d in t.dependencies().items():
                tname = t.name().replace('-', '_')
                dname = d.name().replace('-', '_')

                if d.is_resolved():
                    f.write('    {} -> {};\n'.format(dname, tname))
                else:
                    f.write('    {} -> {}[style=dotted];\n'.format(dname, tname))

        f.write('}\n')
        f.close()


    def run(self, args):
        seeds = Seed.all_seeds()

        dot_path = args.get_named('to-dot-file', 0, 1)
        if dot_path is not None:
            self.write_dot(dot_path)
            return 0

        for s in seeds.values():
            print('{}'.format(s.name()))


class PlatformsCommand(Command):
    def __init__(self):
        super().__init__(
                name='platforms',
                description='List all available platforms')


    def run(self, args):
        print('Supported platforms:')

        platforms = Platform.all_platforms()
        current_platform = Platform.current_platform()

        for p in platforms.values():
            if current_platform is not None and p.name() == current_platform.name():
                print(f'* {Fore.GREEN}{p.name()}{Style.RESET_ALL}')
            else:
                print(f'  {p.name()}')


class HelpCommand(Command):
    def __init__(self):
        super().__init__(
                name='help',
                description='List all available commands.')


    def run(self, args):
        print('Available commands:')

        commands = Command.all_commands()
        max_len = 0

        for c in commands.values():
            if len(c.name()) > max_len:
                max_len = len(c.name())

        max_len += 5
        for c in commands.values():
            print('  ', end='')
            print(c.name(), end='')

            for i in range(len(c.name()), max_len):
                print(' ', end='')

            print(c.description())


class BuildCommand(Command):
    def __init__(self):
        super().__init__(
                name='build',
                description='Build the currently selected target.')


    def run(self, args):
        verbose = args.get_named('verbose', 0, 0)

        current_target = Target.current_target()
        if current_target is None:
            print(f'{Fore.RED}Err:{Style.RESET_ALL} no build target has been set. Use `meadow set target.name <...>` to specify which target to build')
            return -1

        current_platform = Platform.current_platform()
        if current_platform is None:
            print(f'{Fore.RED}Err:{Style.RESET_ALL} no target platform has been set. Use `meadow set target.platform <...>` to specify which platform to target')
            return -1

        components = current_target.resolve()

        for c in components:
            build_system = None
            if isinstance(c, Seed):
                build_system = c.build_system()
                build_system.check_out_of_date()

        for c in components:
            build_system = None
            if isinstance(c, Seed):
                build_system = c.build_system()

            if build_system is not None:
                out_of_date = \
                    build_system.is_configuration_out_of_date() \
                    or build_system.is_build_out_of_date()

                if out_of_date:
                    print(f'{Fore.GREEN}>>>{Style.RESET_ALL} Building {c.name()}')

                if build_system.is_configuration_out_of_date():
                    print(f'{Fore.CYAN}  >>{Style.RESET_ALL} Configuring build...')
                    build_system.configure(verbose=verbose)

                if out_of_date:
                    print(f'{Fore.CYAN}  >>{Style.RESET_ALL} Building...')
                    build_system.build(verbose=verbose)
                    print(f'{Fore.CYAN}  >>{Style.RESET_ALL} Installing...')
                    build_system.install(verbose=verbose)

        print(f'{Style.BRIGHT}{Fore.GREEN}>>> Build Complete!{Style.RESET_ALL}')


class CleanCommand(Command):
    def __init__(self):
        super().__init__(
                name='clean',
                description='Delete all build-related files.')


    def run(self, args):
        build_dir = Environment.build_root()

        for i in os.listdir(build_dir):
            if i.startswith('meadow') and ('cache' not in i):
                continue

            ipath = os.path.join(build_dir, i)
            if os.path.isdir(ipath):
                shutil.rmtree(ipath)
            else:
                os.remove(ipath)

        Cache.reset()
        return 0