import sys
from os.path import join, abspath, dirname, exists, splitext
from subprocess import Popen, PIPE
import csv
from collections import defaultdict

ROOT = abspath(join(dirname(__file__), ".."))
sys.path.append(ROOT)

from workspace_tools.paths import BUILD_DIR, TOOLS_DATA
from workspace_tools.settings import GCC_ARM_PATH
from workspace_tools.tests import TEST_MAP
from workspace_tools.build_api import build_mbed_libs, build_project

SIZE = join(GCC_ARM_PATH, 'arm-none-eabi-size')

def get_size(path):
    out = Popen([SIZE, path], stdout=PIPE).communicate()[0]
    return map(int, out.splitlines()[1].split()[:4])

def get_percentage(before, after):
    if before == 0:
        return 0 if after == 0 else 100.0
    return float(after - before) / float(before) * 100.0

def human_size(val):
    if val>1024:
        return "%.0fKb" % (float(val)/1024.0)
    return "%d" % val

def print_diff(name, before, after):
    print "%s: (%s -> %s) %.2f%%" % (name, human_size(before) , human_size(after) , get_percentage(before , after))

BENCHMARKS = [
    ("BENCHMARK_1", "CENV"),
    ("BENCHMARK_2", "PRINTF"),
    ("BENCHMARK_3", "FP"),
    ("BENCHMARK_4", "MBED"),
    ("BENCHMARK_5", "ALL"),
]
BENCHMARK_DATA_PATH = join(TOOLS_DATA, 'benchmarks.csv')


def benchmarks():
    # CSV Data
    csv_data = csv.writer(open(BENCHMARK_DATA_PATH, 'wb'))
    csv_data.writerow(['Toolchain', "Target", "Benchmark", "code", "data", "bss", "flash"])
    
    # Build
    for toolchain in ['ARM', 'uARM', 'GCC_CR', 'GCC_CS', 'GCC_ARM']:
        for mcu in ["LPC1768", "LPC11U24"]:
            # Build Libraries
            build_mbed_libs(mcu, toolchain)
            
            # Build benchmarks
            build_dir = join(BUILD_DIR, "benchmarks", mcu, toolchain)
            for test_id, title in BENCHMARKS:
                # Build Benchmark
                try:
                    test = TEST_MAP[test_id]
                    path = build_project(test.source_dir, join(build_dir, test_id),
                                 mcu, toolchain, test.dependencies)
                    base, ext = splitext(path)
                    # Check Size
                    code, data, bss, flash = get_size(base+'.elf')
                    csv_data.writerow([toolchain, mcu, title, code, data, bss, flash])
                except Exception, e:
                    print "Unable to build %s for toolchain %s targeting %s" % (test_id, toolchain, mcu)
                    print e


def compare(t1, t2, target):
    if not exists(BENCHMARK_DATA_PATH):
        benchmarks()
    else:
        print "Loading: %s" % BENCHMARK_DATA_PATH
    
    data = csv.reader(open(BENCHMARK_DATA_PATH, 'rb'))
    
    benchmarks_data = defaultdict(dict)
    for (toolchain, mcu, name, code, data, bss, flash) in data:
        if target == mcu:
            for t in [t1, t2]:
                if toolchain == t:
                    benchmarks_data[name][t] = map(int, (code, data, bss, flash))
    
    print "%s vs %s for %s" % (t1, t2, target)
    for name, data in benchmarks_data.iteritems():
        try:
            # Check Size
            code_a, data_a, bss_a, flash_a = data[t1]
            code_u, data_u, bss_u, flash_u = data[t2]
            
            print "\n=== %s ===" % name
            print_diff("code", code_a , code_u)
            print_diff("data", data_a , data_u)
            print_diff("bss", bss_a , bss_u)
            print_diff("flash", flash_a , flash_u)
        except Exception, e:
            print "No data for benchmark %s" % (name)
            print e


if __name__ == '__main__':
    compare("GCC_CR", "GCC_CS", "LPC1768")