#!/usr/bin/env python3
"""
Generate a driver/library benchmark based on DFA/PTA traces.

Usage:
PYTHONPATH=lib bin/generate-dfa-benchmark.py [options] <pta/dfa definition> [output.cc]

generate-dfa-benchmarks reads in a DFA definition and generates runs
(i.e., all words accepted by the DFA up to a configurable length). Each symbol
corresponds to a function call. If arguments are specified in the DFA
definition, each symbol corresponds to a function call with a specific set of
arguments (so all argument combinations are present in the generated runs).

Options:
--depth=<depth> (default: 3)
    Maximum number of function calls per run

--instance=<name>
    Override the name of the class instance used for benchmarking

--sleep=<ms> (default: 0)
    How long to sleep between function calls.
"""

import getopt
import json
import re
import runner
import sys
import time
import io
import yaml
from automata import PTA
from harness import OnboardTimerHarness

opt = {}

if __name__ == '__main__':

    try:
        optspec = (
            'arch= '
            'app= '
            'depth= '
            'instance= '
            'run= '
            'sleep= '
            'timer-pin= '
        )
        raw_opts, args = getopt.getopt(sys.argv[1:], "", optspec.split(' '))

        for option, parameter in raw_opts:
            optname = re.sub(r'^--', '', option)
            opt[optname] = parameter

        if 'depth' in opt:
            opt['depth'] = int(opt['depth'])
        else:
            opt['depth'] = 3

        if 'sleep' in opt:
            opt['sleep'] = int(opt['sleep'])

    except getopt.GetoptError as err:
        print(err)
        sys.exit(2)

    modelfile = args[0]

    with open(modelfile, 'r') as f:
        if '.json' in modelfile:
            pta = PTA.from_json(json.load(f))
        else:
            pta = PTA.from_yaml(yaml.safe_load(f))

    if 'timer-pin' in opt:
        timer_pin = opt['timer-pin']
    else:
        timer_pin = 'GPIO::p1_0'

    harness = OnboardTimerHarness(timer_pin)

    outbuf = io.StringIO()

    outbuf.write('#include "arch.h"\n')
    if 'includes' in pta.codegen:
        for include in pta.codegen['includes']:
            outbuf.write('#include "{}"\n'.format(include))
    outbuf.write(harness.global_code())

    outbuf.write('void loop(void)\n')
    outbuf.write('{\n')

    outbuf.write(harness.start_benchmark())

    class_prefix = ''
    if 'instance' in opt:
        class_prefix = '{}.'.format(opt['instance'])
    elif 'instance' in pta.codegen:
        class_prefix = '{}.'.format(pta.codegen['instance'])

    num_transitions = 0
    for run in pta.dfs(opt['depth'], with_arguments = True, with_parameters = True):
        outbuf.write(harness.start_run())
        harness.start_trace()
        param = pta.get_initial_param_dict()
        for transition, arguments, parameter in run:
            num_transitions += 1
            harness.append_state(transition.origin.name, param)
            harness.append_transition(transition.name, param)
            outbuf.write('// {} -> {}\n'.format(transition.origin.name, transition.destination.name))
            if transition.is_interrupt:
                outbuf.write('// wait for {} interrupt\n'.format(transition.name))
                transition_code = '// TODO add startTransition / stopTransition calls to interrupt routine'
            else:
                transition_code = '{}{}({});'.format(class_prefix, transition.name, ', '.join(map(str, arguments)))
            outbuf.write(harness.pass_transition(pta.get_transition_id(transition), transition_code, transition = transition, parameter = parameter))

            param = parameter

            if 'sleep' in opt:
                outbuf.write('arch.delay_ms({:d});\n'.format(opt['sleep']))

        outbuf.write(harness.stop_run())
        outbuf.write('\n')

    outbuf.write(harness.stop_benchmark())
    print(harness.traces)
    outbuf.write('}\n')
    outbuf.write('int main(void)\n')
    outbuf.write('{\n')
    for driver in ('arch', 'gpio', 'kout'):
        outbuf.write('{}.setup();\n'.format(driver))
    if 'setup' in pta.codegen:
        for call in pta.codegen['setup']:
            outbuf.write(call)
    outbuf.write('arch.idle_loop();\n')
    outbuf.write('return 0;\n')
    outbuf.write('}\n')

    if len(args) > 1:
        with open(args[1], 'w') as f:
            f.write(outbuf.getvalue())
    else:
        print(outbuf.getvalue())

    if 'run' in opt:
        if 'sleep' in opt:
            run_timeout = num_transitions * opt['sleep'] / 1000
        else:
            run_timeout = num_transitions * 10 / 1000
        monitor = runner.get_monitor(opt['arch'], callback = harness.parser_cb)
        runner.build(opt['arch'], opt['app'], opt['run'].split())
        runner.flash(opt['arch'], opt['app'], opt['run'].split())
        if opt['arch'] != 'posix':
            try:
                slept = 0
                while True:
                    time.sleep(5)
                    slept += 5
                    if slept < run_timeout:
                        print('[MON] approx. {:.0f}% done'.format(slept * 100 / run_timeout))
            except KeyboardInterrupt:
                pass
            lines = monitor.get_lines()
            monitor.close()
        else:
            print('[MON] Will run benchmark for {:.0f} seconds'.format(2 * run_timeout))
            lines = monitor.run(int(2 * run_timeout))
        print(lines)

    sys.exit(0)