"""
mbed SDK
Copyright (c) 2011-2013 ARM Limited

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
import re
from os import remove
from os.path import join, exists, dirname, splitext, exists
from distutils.spawn import find_executable

from tools.toolchains import mbedToolchain, TOOLCHAIN_PATHS
from tools.hooks import hook_tool

class IAR(mbedToolchain):
    LIBRARY_EXT = '.a'
    LINKER_EXT = '.icf'
    STD_LIB_NAME = "%s.a"

    DIAGNOSTIC_PATTERN = re.compile('"(?P<file>[^"]+)",(?P<line>[\d]+)\s+(?P<severity>Warning|Error)(?P<message>.+)')
    INDEX_PATTERN  = re.compile('(?P<col>\s*)\^')

    DEFAULT_FLAGS = {
        'common': [
            "--no_wrap_diagnostics",
            # Pa050: No need to be notified about "non-native end of line sequence"
            # Pa084: Pointless integer comparison -> checks for the values of an enum, but we use values outside of the enum to notify errors (ie: NC).
            # Pa093: Implicit conversion from float to integer (ie: wait_ms(85.4) -> wait_ms(85))
            # Pa082: Operation involving two values from two registers (ie: (float)(*obj->MR)/(float)(LPC_PWM1->MR0))
            "-e", # Enable IAR language extension
            "--diag_suppress=Pa050,Pa084,Pa093,Pa082"],
        'asm': [],
        'c': ["--vla"],
        'cxx': ["--guard_calls"],
        'ld': ["--skip_dynamic_initialization", "--threaded_lib"],
    }

    def __init__(self, target, options=None, notify=None, macros=None, silent=False, extra_verbose=False):
        mbedToolchain.__init__(self, target, options, notify, macros, silent, extra_verbose=extra_verbose)
        if target.core == "Cortex-M7F" or target.core == "Cortex-M7FD":
            cpuchoice = "Cortex-M7"
        else:
            cpuchoice = target.core

        if not TOOLCHAIN_PATHS['IAR']:
            exe =  find_executable('iccarm')
            if exe:
                TOOLCHAIN_PATHS['IAR'] = dirname(dirname(exe))

        # flags_cmd are used only by our scripts, the project files have them already defined,
        # using this flags results in the errors (duplication)
        # asm accepts --cpu Core or --fpu FPU, not like c/c++ --cpu=Core
        if target.core == "Cortex-M4F":
          asm_flags_cmd = [
              "--cpu", "Cortex-M4F"
          ]
        else:
          asm_flags_cmd = [
              "--cpu", cpuchoice
          ]
        # custom c flags
        if target.core == "Cortex-M4F":
          c_flags_cmd = [
              "--cpu", "Cortex-M4F",
              "--thumb", "--dlib_config", join(TOOLCHAIN_PATHS['IAR'], "inc", "c", "DLib_Config_Full.h")
          ]
        else:
          c_flags_cmd = [
              "--cpu", cpuchoice,
              "--thumb", "--dlib_config", join(TOOLCHAIN_PATHS['IAR'], "inc", "c", "DLib_Config_Full.h")
          ]
        # custom c++ cmd flags
        cxx_flags_cmd = [
            "--c++", "--no_rtti", "--no_exceptions"
        ]
        if target.core == "Cortex-M7FD":
            asm_flags_cmd += ["--fpu", "VFPv5"]
            c_flags_cmd.append("--fpu=VFPv5")
        elif target.core == "Cortex-M7F":
            asm_flags_cmd += ["--fpu", "VFPv5_sp"]
            c_flags_cmd.append("--fpu=VFPv5_sp")

        if "debug-info" in self.options:
            c_flags_cmd.append("-r")
            c_flags_cmd.append("-On")
        else:
            c_flags_cmd.append("-Oh")

        IAR_BIN = join(TOOLCHAIN_PATHS['IAR'], "bin")
        main_cc = join(IAR_BIN, "iccarm")

        self.asm  = [join(IAR_BIN, "iasmarm")] + asm_flags_cmd + self.flags["asm"]
        self.cc   = [main_cc]
        self.cppc = [main_cc]
        self.cc += self.flags["common"] + c_flags_cmd + self.flags["c"]
        self.cppc += self.flags["common"] + c_flags_cmd + cxx_flags_cmd + self.flags["cxx"]
        self.ld   = [join(IAR_BIN, "ilinkarm")]
        self.ar = join(IAR_BIN, "iarchive")
        self.elf2bin = join(IAR_BIN, "ielftool")

        self.toolchain_path = TOOLCHAIN_PATHS['IAR']

    def parse_dependencies(self, dep_path):
        return [(self.CHROOT if self.CHROOT else '')+path.strip() for path in open(dep_path).readlines()
                if (path and not path.isspace())]

    def parse_output(self, output):
        msg = None
        for line in output.splitlines():
            match = IAR.DIAGNOSTIC_PATTERN.match(line)
            if match is not None:
                if msg is not None:
                    self.cc_info(msg)
                msg = {
                    'severity': match.group('severity').lower(),
                    'file': match.group('file'),
                    'line': match.group('line'),
                    'col': 0,
                    'message': match.group('message'),
                    'text': '',
                    'target_name': self.target.name,
                    'toolchain_name': self.name
                }
            elif msg is not None:
                # Determine the warning/error column by calculating the ^ position
                match = IAR.INDEX_PATTERN.match(line)
                if match is not None:
                    msg['col'] = len(match.group('col'))
                    self.cc_info(msg)
                    msg = None
                else:
                    msg['text'] += line+"\n"

    def get_dep_option(self, object):
        base, _ = splitext(object)
        dep_path = base + '.d'
        return ["--dependencies", dep_path]

    def cc_extra(self, object):
        base, _ = splitext(object)
        return ["-l", base + '.s.txt']

    def get_config_option(self, config_header):
        return ['--preinclude=' + config_header]

    def get_compile_options(self, defines, includes, for_asm=False):
        opts = ['-D%s' % d for d in defines]
        if self.RESPONSE_FILES:
            opts += ['-f', self.get_inc_file(includes)]
        else:
            opts += ["-I%s" % i for i in includes]

        if not for_asm:
            config_header = self.get_config_header()
            if config_header is not None:
                opts = opts + self.get_config_option(config_header)
        return opts

    @hook_tool
    def assemble(self, source, object, includes):
        # Build assemble command
        cmd = self.asm + self.get_compile_options(self.get_symbols(True), includes, True) + ["-o", object, source]

        # Call cmdline hook
        cmd = self.hook.get_cmdline_assembler(cmd)

        # Return command array, don't execute
        return [cmd]

    @hook_tool
    def compile(self, cc, source, object, includes):
        # Build compile command
        cmd = cc +  self.get_compile_options(self.get_symbols(), includes)

        cmd.extend(self.get_dep_option(object))

        cmd.extend(self.cc_extra(object))
        
        cmd.extend(["-o", object, source])

        # Call cmdline hook
        cmd = self.hook.get_cmdline_compiler(cmd)

        return [cmd]

    def compile_c(self, source, object, includes):
        return self.compile(self.cc, source, object, includes)

    def compile_cpp(self, source, object, includes):
        return self.compile(self.cppc, source, object, includes)

    @hook_tool
    def link(self, output, objects, libraries, lib_dirs, mem_map):
        # Build linker command
        map_file = splitext(output)[0] + ".map"
        cmd = self.ld + [ "-o", output, "--map=%s" % map_file] + objects + libraries + self.flags['ld']

        if mem_map:
            cmd.extend(["--config", mem_map])

        # Call cmdline hook
        cmd = self.hook.get_cmdline_linker(cmd)

        if self.RESPONSE_FILES:
            # Split link command to linker executable + response file
            cmd_linker = cmd[0]
            link_files = self.get_link_file(cmd[1:])
            cmd = [cmd_linker, '-f', link_files]

        # Exec command
        self.cc_verbose("Link: %s" % ' '.join(cmd))
        self.default_cmd(cmd)

    @hook_tool
    def archive(self, objects, lib_path):
        if self.RESPONSE_FILES:
            param = ['-f', self.get_arch_file(objects)]
        else:
            param = objects

        if exists(lib_path):
            remove(lib_path)

        self.default_cmd([self.ar, lib_path] + param)

    @hook_tool
    def binary(self, resources, elf, bin):
        # Build binary command
        cmd = [self.elf2bin, "--bin", elf, bin]

        # Call cmdline hook
        cmd = self.hook.get_cmdline_binary(cmd)

        # Exec command
        self.cc_verbose("FromELF: %s" % ' '.join(cmd))
        self.default_cmd(cmd)
