# CodeQ: an online programming tutor.
# Copyright (C) 2015 UL FRI
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

import os
import pickle
import sys

from termcolor import colored

from db.models import CodeqUser, Problem, Solution
from .graph import graphviz
from . import fix, fix_hints
from prolog.util import annotate, compose, stringify
import server.problems
from .util import indent

# Get problem id from commandline.
if len(sys.argv) < 2:
    print('usage: ' + sys.argv[0] + ' <pid>')
    sys.exit(1)

problem = Problem.get(id=sys.argv[1])

solved_problems = [p for p in CodeqUser.solved_problems(1, problem.language)
                           if p != (problem.group, problem.identifier)]
other_solutions = server.problems.solutions_for_problems(problem.language, solved_problems)
problem_module = server.problems.load_problem(problem.language, problem.group, problem.identifier, 'common')
name = server.problems.load_problem(problem.language, problem.group, problem.identifier, 'en').name

# Testing function.
def test(code):
    correct, hints = problem_module.test(code, solved_problems)
    return correct

traces = [s.trace for s in Solution.filter(problem_id=problem.id)]

# Load hint database stored in edits.pickle.
edits, submissions, queries, names = pickle.load(open('edits.pickle', 'rb'))
edits, submissions, queries, names = edits[problem.id], submissions[problem.id], queries[problem.id], names[problem.id]

# Load current status (programs for which a hint was found).
try:
    done = pickle.load(open('status-'+str(problem.id)+'.pickle', 'rb'))
except:
    done = []

def print_hint(code, solution, steps, fix_time, n_tested):
    if solution:
        print(colored('Hint found! Tested {} programs in {:.1f} s.'.format(n_tested, fix_time), 'green'))
        print(colored(' Edits', 'blue'))
        for step_type, pos, a, b in steps:
            print('  {}: {} {} → {}'.format(pos, step_type, stringify(a), stringify(b)))
        print(colored(' Hints', 'blue'))
        for fix_type, start, end, msg in fix_hints(code, steps):
            print('  {}-{}: {} (fix type: {})'.format(start, end, msg, fix_type))
        print(colored(' Final version', 'blue'))
        print(indent(compose(annotate(solution)), 2))
    else:
        print(colored('Hint not found! Tested {} programs in {:.1f} s.'.format(n_tested, fix_time), 'red'))

# Run interactive loop.
if len(sys.argv) == 2:
    while True:
        # Read the program from stdin.
        print('Enter program, end with empty line:')
        code = ''
        try:
            while True:
                line = input()
                if not line:
                    break
                code += line + '\n'
        except EOFError:
            break

        # Try finding a fix.
        print(colored('Analyzing program…', 'yellow'))
        solution, steps, fix_time, n_tested = fix(name, code, edits, test, debug=True)
        print_hint(code, solution, steps, fix_time, n_tested)

# Test fix() on incorrect student submissions.
elif sys.argv[2] == 'test':
    timeout = int(sys.argv[3]) if len(sys.argv) == 4 else 10

    # Find incorrect submissions.
    incorrect_all = []
    for submission, count in sorted(submissions.items()):
        if not test(submission):
            # This incorrect submission appeared in [count] traces.
            incorrect_all += [submission]*count
    incorrect = set(incorrect_all)

    print('Fixing {}/{} programs (timeout={})…'.format(
        len([p for p in incorrect if p not in done]), len(incorrect), timeout))

    for i, program in enumerate(sorted(incorrect)):
        if program in done:
            continue
        print(colored('Analyzing program {0}/{1}…'.format(i+1, len(incorrect)), 'yellow'))
        print(indent(compose(annotate(program)), 2))

        solution, steps, fix_time, n_tested = fix(name, program, edits, test, timeout=timeout)
        if solution:
            done.append(program)
        print_hint(program, solution, steps, fix_time, n_tested)
        print()

        pickle.dump(done, open('status-'+str(problem.id)+'.pickle', 'wb'))

    print('Found hints for ' + str(len(done)) + ' of ' + str(len(incorrect)) + ' incorrect programs')

# Print info for this problem.
elif sys.argv[2] == 'info':
    # With no additional arguments, print some stats.
    if len(sys.argv) == 3:
        print('Problem {} ({}): {} edits and {} unique submissions in {} traces'.format(
            problem.id, colored(name, 'yellow'),
            colored(str(len(edits)), 'yellow'),
            colored(str(len(submissions)), 'yellow'),
            colored(str(len(traces)), 'yellow')))

    # Print all observed edits and their costs.
    elif sys.argv[3] == 'edits':
        for (before, after), cost in sorted(edits.items(), key=lambda x: x[1]):
            print(' {:.4f}\t{} → {}'.format(cost, stringify(before) if before else 'ε',
                                                  stringify(after) if after else 'ε'))
    # Print all observed edits and their costs.
    elif sys.argv[3] == 'names':
        for name, count in sorted(names.items(), key=lambda x: x[1]):
            print(' {:.4f}\t{}'.format(count,  name))

    # Print all student queries and their counts.
    elif sys.argv[3] == 'queries':
        for query, count in queries.most_common():
            print('  ' + str(count) + '\t' + query)

    # Print all student submissions and their counts.
    elif sys.argv[3] == 'submissions':
        for submission, count in submissions.most_common():
            print('{}\t{}'.format(count, submission))