# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
from __future__ import absolute_import, division, print_function, unicode_literals

try:
    from builtins import object, str
except ImportError:
    from __builtin__ import object, str
import pprint

import targets_cfg

class LiteralValue:
    def __init__(self, value):
        self.value = value

    def __str__(self):
        return str(self.value)

def smart_quote_value(val):
    if isinstance(val, LiteralValue):
        return str(val)
    return '"%s"' % val

def pretty_list(lst, indent=8):
    if lst is None or len(lst) == 0:
        return ""

    if len(lst) == 1:
        return smart_quote_value(lst[0])

    separator = ',\n%s' % (" " * indent)
    res = separator.join(sorted(map(smart_quote_value, lst)))
    res = "\n" + (" " * indent) + res + ',\n' + (" " * (indent - 4))
    return res


class TARGETSBuilder:
    def __init__(self, path, extra_argv):
        self.path = path
        header = targets_cfg.rocksdb_target_header_template.format(
            extra_argv=extra_argv
        )
        with open(path, "wb") as targets_file:
            targets_file.write(header.encode("utf-8"))
        self.total_lib = 0
        self.total_bin = 0
        self.total_test = 0
        self.tests_cfg = ""

    def add_library(
        self,
        name,
        srcs,
        deps=None,
        headers=None,
        extra_external_deps="",
        link_whole=False,
        external_dependencies=None,
        extra_test_libs=False,
    ):
        if headers is not None:
            if isinstance(headers, LiteralValue):
                headers = str(headers)
            else:
                headers = "[" + pretty_list(headers) + "]"
        else:
            headers = "[]"
        with open(self.path, "ab") as targets_file:
            targets_file.write(
                targets_cfg.library_template.format(
                    name=name,
                    srcs=pretty_list(srcs),
                    headers=headers,
                    deps=pretty_list(deps),
                    extra_external_deps=extra_external_deps,
                    link_whole=link_whole,
                    external_dependencies=pretty_list(external_dependencies),
                    extra_test_libs=extra_test_libs,
                ).encode("utf-8")
            )
        self.total_lib = self.total_lib + 1

    def add_rocksdb_library(self, name, srcs, headers=None, external_dependencies=None):
        headers = "[" + pretty_list(headers) + "]"
        with open(self.path, "ab") as targets_file:
            targets_file.write(
                targets_cfg.rocksdb_library_template.format(
                    name=name,
                    srcs=pretty_list(srcs),
                    headers=headers,
                    external_dependencies=pretty_list(external_dependencies),
                ).encode("utf-8")
            )
        self.total_lib = self.total_lib + 1

    def add_binary(
        self,
        name,
        srcs,
        deps=None,
        extra_preprocessor_flags=None,
        extra_bench_libs=False,
    ):
        with open(self.path, "ab") as targets_file:
            targets_file.write(
                targets_cfg.binary_template.format(
                    name=name,
                    srcs=pretty_list(srcs),
                    deps=pretty_list(deps),
                    extra_preprocessor_flags=pretty_list(extra_preprocessor_flags),
                    extra_bench_libs=extra_bench_libs,
                ).encode("utf-8")
            )
        self.total_bin = self.total_bin + 1

    def add_c_test(self):
        with open(self.path, "ab") as targets_file:
            targets_file.write(
                b"""
add_c_test_wrapper()
"""
            )

    def add_test_header(self):
        with open(self.path, "ab") as targets_file:
            targets_file.write(
                b"""
        # Generate a test rule for each entry in ROCKS_TESTS
        # Do not build the tests in opt mode, since SyncPoint and other test code
        # will not be included.
"""
            )

    def add_fancy_bench_config(
        self,
        name,
        bench_config,
        slow,
        expected_runtime,
        sl_iterations,
        regression_threshold,
    ):
        with open(self.path, "ab") as targets_file:
            targets_file.write(
                targets_cfg.fancy_bench_template.format(
                    name=name,
                    bench_config=pprint.pformat(bench_config),
                    slow=slow,
                    expected_runtime=expected_runtime,
                    sl_iterations=sl_iterations,
                    regression_threshold=regression_threshold,
                ).encode("utf-8")
            )

    def register_test(self, test_name, src, deps, extra_compiler_flags):
        with open(self.path, "ab") as targets_file:
            targets_file.write(
                targets_cfg.unittests_template.format(
                    test_name=test_name,
                    test_cc=str(src),
                    deps=deps,
                    extra_compiler_flags=extra_compiler_flags,
                ).encode("utf-8")
            )
        self.total_test = self.total_test + 1

    def export_file(self, name):
        with open(self.path, "a") as targets_file:
            targets_file.write(
                targets_cfg.export_file_template.format(name=name)
            )