# Copyright lowRISC contributors.
# Licensed under the Apache License, Version 2.0, see LICENSE for details.
# SPDX-License-Identifier: Apache-2.0

import datetime
import logging as log
import os
import pprint
from shutil import which
import subprocess
import sys

import hjson

from Deploy import Deploy
from utils import VERBOSE, md_results_to_html, parse_hjson, subst_wildcards

# A set of fields that can be overridden on the command line.
_CMDLINE_FIELDS = {'tool', 'verbosity'}


# Interface class for extensions.
class FlowCfg():
    def __str__(self):
        return pprint.pformat(self.__dict__)

    def __init__(self, flow_cfg_file, proj_root, args):
        # Options set from command line
        self.items = args.items
        self.list_items = args.list
        self.select_cfgs = args.select_cfgs
        self.flow_cfg_file = flow_cfg_file
        self.proj_root = proj_root
        self.args = args
        self.scratch_root = args.scratch_root
        self.branch = args.branch
        self.job_prefix = args.job_prefix

        # Options set from hjson cfg.
        self.project = ""
        self.scratch_path = ""

        # Imported cfg files using 'import_cfgs' keyword
        self.imported_cfg_files = [flow_cfg_file]

        # Add exports using 'exports' keyword - these are exported to the child
        # process' environment.
        self.exports = []

        # Add overrides using the overrides keyword - existing attributes
        # are overridden with the override values.
        self.overrides = []

        # List of cfgs if the parsed cfg is a primary cfg list
        self.cfgs = []

        # Add a notion of "primary" cfg - this is indicated using
        # a special key 'use_cfgs' within the hjson cfg.
        self.is_primary_cfg = False

        # For a primary cfg, it is the aggregated list of all deploy objects under self.cfgs.
        # For a non-primary cfg, it is the list of items slated for dispatch.
        self.deploy = []

        # Timestamp
        self.ts_format_long = args.ts_format_long
        self.timestamp_long = args.timestamp_long
        self.ts_format = args.ts_format
        self.timestamp = args.timestamp

        # Results
        self.errors_seen = False
        self.rel_path = ""
        self.results_title = ""
        self.revision_string = ""
        self.results_server_prefix = ""
        self.results_server_url_prefix = ""
        self.results_server_cmd = ""
        self.css_file = os.path.join(os.path.dirname(os.path.realpath(__file__)), "style.css")
        self.results_server_path = ""
        self.results_server_dir = ""
        self.results_server_html = ""
        self.results_server_page = ""
        self.results_summary_server_html = ""
        self.results_summary_server_page = ""

        # Full results in md text
        self.results_md = ""
        # Selectively sanitized md results to be mailed out or published
        self.email_results_md = ""
        self.publish_results_md = ""
        self.sanitize_email_results = False
        self.sanitize_publish_results = False
        # Summary results, generated by over-arching cfg
        self.email_summary_md = ""
        self.results_summary_md = ""

    def __post_init__(self):
        # Run some post init checks
        if not self.is_primary_cfg:
            # Check if self.cfgs is a list of exactly 1 item (self)
            if not (len(self.cfgs) == 1 and self.cfgs[0].name == self.name):
                log.error("Parse error!\n%s", self.cfgs)
                sys.exit(1)

    def create_instance(self, flow_cfg_file):
        '''Create a new instance of this class for the given config file.

        '''
        return type(self)(flow_cfg_file, self.proj_root, self.args)

    def kill(self):
        '''kill running processes and jobs gracefully
        '''
        for item in self.deploy:
            item.kill()

    def _parse_cfg(self, path, is_entry_point):
        '''Load an hjson config file at path and update self accordingly.

        If is_entry_point is true, this is the top-level configuration file, so
        it's possible that this is a primary config.

        '''
        hjson_dict = parse_hjson(path)

        # Check if this is the primary cfg, if this is the entry point cfg file
        if is_entry_point:
            self.is_primary_cfg = self.check_if_primary_cfg(hjson_dict)

            # If not a primary cfg, then register self with self.cfgs
            if self.is_primary_cfg is False:
                self.cfgs.append(self)

        # Resolve the raw hjson dict to build this object
        self.resolve_hjson_raw(path, hjson_dict)

    def _parse_flow_cfg(self, path):
        '''Parse the flow's hjson configuration.

        This is a private API which should be called by the __init__ method of
        each subclass.

        '''
        self._parse_cfg(path, True)
        if self.rel_path == "":
            self.rel_path = os.path.dirname(self.flow_cfg_file).replace(
                self.proj_root + '/', '')

    def check_if_primary_cfg(self, hjson_dict):
        # This is a primary cfg only if it has a single key called "use_cfgs"
        # which contains a list of actual flow cfgs.
        hjson_cfg_dict_keys = hjson_dict.keys()
        return ("use_cfgs" in hjson_cfg_dict_keys and type(hjson_dict["use_cfgs"]) is list)

    def _set_attribute(self, path, key, dict_val):
        '''Set an attribute from an hjson file

        The path argument is the path for the hjson file that we're reading.

        '''
        # Is this value overridden on the command line? If so, use the override
        # instead.
        args_val = None
        if key in _CMDLINE_FIELDS:
            args_val = getattr(self.args, key, None)
        override_msg = ''
        if args_val is not None:
            dict_val = args_val
            override_msg = ' from command-line override'

        self_val = getattr(self, key, None)
        if self_val is None:
            # A new attribute (or the old value was None, in which case it's
            # just a placeholder and needs writing). Set it and return.
            setattr(self, key, dict_val)
            return

        # This is already an attribute. Firstly, we need to make sure the types
        # are compatible.
        if type(dict_val) != type(self_val):
            log.error("Conflicting types for key {!r} when loading {!r}. "
                      "Cannot override value {!r} with {!r} (which is of "
                      "type {}{})."
                      .format(key, path, self_val, dict_val,
                              type(dict_val).__name__, override_msg))
            sys.exit(1)

        # Looks like the types are compatible. If they are lists, concatenate
        # them.
        if isinstance(self_val, list):
            setattr(self, key, self_val + dict_val)
            return

        # Otherwise, check whether this is a type we know how to deal with.
        scalar_types = {str: [""], int: [0, -1], bool: [False]}

        defaults = scalar_types.get(type(dict_val))
        if defaults is None:
            log.error("When loading {!r} and setting key {!r}, found a value "
                      "of {!r}{} with unsupported type {}."
                      .format(path, key, dict_val,
                              override_msg, type(dict_val).__name__))
            sys.exit(1)

        # If the values are equal, there's nothing more to do
        if self_val == dict_val:
            return

        old_is_default = self_val in defaults
        new_is_default = dict_val in defaults

        # Similarly, if new value looks like a default, ignore it (regardless
        # of whether the current value looks like a default).
        if new_is_default:
            return

        # If the existing value looks like a default and the new value doesn't,
        # take the new value.
        if old_is_default:
            setattr(self, key, dict_val)
            return

        # Neither value looks like a default. Raise an error.
        log.error("When loading {!r}, key {!r} is given a value of "
                  "{!r}{}, but the key is already set to {!r}."
                  .format(path, key, dict_val, override_msg, self_val))
        sys.exit(1)

    def resolve_hjson_raw(self, path, hjson_dict):
        import_cfgs = []
        use_cfgs = []
        for key, dict_val in hjson_dict.items():
            # If key is 'import_cfgs' then add to the list of cfgs to process
            if key == 'import_cfgs':
                import_cfgs.extend(dict_val)
                continue

            # If the key is 'use_cfgs', we're only allowed to take effect for a
            # primary config list. If we are in a primary config list, add it.
            if key == 'use_cfgs':
                if not self.is_primary_cfg:
                    log.error("Key 'use_cfgs' encountered in the non-primary "
                              "cfg file list {!r}."
                              .format(path))
                    sys.exit(1)

                use_cfgs.extend(dict_val)
                continue

            # Otherwise, set an attribute on self.
            self._set_attribute(path, key, dict_val)

        # Parse imported cfgs
        for cfg_file in import_cfgs:
            if cfg_file not in self.imported_cfg_files:
                self.imported_cfg_files.append(cfg_file)
                # Substitute wildcards in cfg_file files since we need to process
                # them right away.
                cfg_file = subst_wildcards(cfg_file, self.__dict__)
                self._parse_cfg(cfg_file, False)
            else:
                log.error("Cfg file \"%s\" has already been parsed", cfg_file)

        # Parse primary cfg files
        if self.is_primary_cfg:
            for entry in use_cfgs:
                if type(entry) is str:
                    # Treat this as a file entry
                    # Substitute wildcards in cfg_file files since we need to process
                    # them right away.
                    cfg_file = subst_wildcards(entry,
                                               self.__dict__,
                                               ignore_error=True)
                    self.cfgs.append(self.create_instance(cfg_file))

                elif type(entry) is dict:
                    # Treat this as a cfg expanded in-line
                    temp_cfg_file = self._conv_inline_cfg_to_hjson(entry)
                    if not temp_cfg_file:
                        continue
                    self.cfgs.append(self.create_instance(temp_cfg_file))

                    # Delete the temp_cfg_file once the instance is created
                    try:
                        log.log(VERBOSE, "Deleting temp cfg file:\n%s",
                                temp_cfg_file)
                        os.system("/bin/rm -rf " + temp_cfg_file)
                    except IOError:
                        log.error("Failed to remove temp cfg file:\n%s",
                                  temp_cfg_file)

                else:
                    log.error(
                        "Type of entry \"%s\" in the \"use_cfgs\" key is invalid: %s",
                        entry, str(type(entry)))
                    sys.exit(1)

    def _conv_inline_cfg_to_hjson(self, idict):
        '''Dump a temp hjson file in the scratch space from input dict.
        This method is to be called only by a primary cfg'''

        if not self.is_primary_cfg:
            log.fatal("This method can only be called by a primary cfg")
            sys.exit(1)

        name = idict["name"] if "name" in idict.keys() else None
        if not name:
            log.error("In-line entry in use_cfgs list does not contain "
                      "a \"name\" key (will be skipped!):\n%s",
                      idict)
            return None

        # Check if temp cfg file already exists
        temp_cfg_file = (self.scratch_root + "/." + self.branch + "__" +
                         name + "_cfg.hjson")

        # Create the file and dump the dict as hjson
        log.log(VERBOSE, "Dumping inline cfg \"%s\" in hjson to:\n%s", name,
                temp_cfg_file)
        try:
            with open(temp_cfg_file, "w") as f:
                f.write(hjson.dumps(idict, for_json=True))
        except Exception as e:
            log.error("Failed to hjson-dump temp cfg file\"%s\" for \"%s\""
                      "(will be skipped!) due to:\n%s",
                      temp_cfg_file, name, e)
            return None

        # Return the temp cfg file created
        return temp_cfg_file

    def _process_overrides(self):
        # Look through the dict and find available overrides.
        # If override is available, check if the type of the value for existing
        # and the overridden keys are the same.
        overrides_dict = {}
        if hasattr(self, "overrides"):
            overrides = getattr(self, "overrides")
            if type(overrides) is not list:
                log.error(
                    "The type of key \"overrides\" is %s - it should be a list",
                    type(overrides))
                sys.exit(1)

            # Process override one by one
            for item in overrides:
                if type(item) is dict and set(item.keys()) == {"name", "value"}:
                    ov_name = item["name"]
                    ov_value = item["value"]
                    if ov_name not in overrides_dict.keys():
                        overrides_dict[ov_name] = ov_value
                        self._do_override(ov_name, ov_value)
                    else:
                        log.error(
                            "Override for key \"%s\" already exists!\nOld: %s\nNew: %s",
                            ov_name, overrides_dict[ov_name], ov_value)
                        sys.exit(1)
                else:
                    log.error("\"overrides\" is a list of dicts with {\"name\": <name>, "
                              "\"value\": <value>} pairs. Found this instead:\n%s",
                              str(item))
                    sys.exit(1)

    def _do_override(self, ov_name, ov_value):
        # Go through self attributes and replace with overrides
        if hasattr(self, ov_name):
            orig_value = getattr(self, ov_name)
            if type(orig_value) == type(ov_value):
                log.debug("Overriding \"%s\" value \"%s\" with \"%s\"",
                          ov_name, orig_value, ov_value)
                setattr(self, ov_name, ov_value)
            else:
                log.error("The type of override value \"%s\" for \"%s\" mismatches "
                          "the type of original value \"%s\"",
                          ov_value, ov_name, orig_value)
                sys.exit(1)
        else:
            log.error("Override key \"%s\" not found in the cfg!", ov_name)
            sys.exit(1)

    def _purge(self):
        '''Purge the existing scratch areas in preperation for the new run.'''
        return

    def purge(self):
        '''Public facing API for _purge().
        '''
        for item in self.cfgs:
            item._purge()

    def _print_list(self):
        '''Print the list of available items that can be kicked off.
        '''
        return

    def print_list(self):
        '''Public facing API for _print_list().
        '''
        for item in self.cfgs:
            item._print_list()

    def prune_selected_cfgs(self):
        '''Prune the list of configs for a primary config file'''

        # This should run after self.cfgs has been set
        assert self.cfgs

        # If the user didn't pass --select-cfgs, we don't do anything.
        if self.select_cfgs is None:
            return

        # If the user passed --select-cfgs, but this isn't a primary config
        # file, we should probably complain.
        if not self.is_primary_cfg:
            log.error('The configuration file at {!r} is not a primary config, '
                      'but --select-cfgs was passed on the command line.'
                      .format(self.flow_cfg_file))
            sys.exit(1)

        # Filter configurations
        self.cfgs = [c for c in self.cfgs if c.name in self.select_cfgs]

    def _create_deploy_objects(self):
        '''Create deploy objects from items that were passed on for being run.
        The deploy objects for build and run are created from the objects that were
        created from the create_objects() method.
        '''
        return

    def create_deploy_objects(self):
        '''Public facing API for _create_deploy_objects().
        '''
        self.prune_selected_cfgs()
        if self.is_primary_cfg:
            self.deploy = []
            for item in self.cfgs:
                item._create_deploy_objects()
                self.deploy.extend(item.deploy)
        else:
            self._create_deploy_objects()

    def deploy_objects(self):
        '''Public facing API for deploying all available objects.'''
        Deploy.deploy(self.deploy)

    def _gen_results(self, fmt="md"):
        '''
        The function is called after the regression has completed. It collates the
        status of all run targets and generates a dict. It parses the testplan and
        maps the generated result to the testplan entries to generate a final table
        (list). It also prints the full list of failures for debug / triage. The
        final result is in markdown format.
        '''
        return

    def gen_results(self):
        '''Public facing API for _gen_results().
        '''
        results = []
        for item in self.cfgs:
            result = item._gen_results()
            log.info("[results]: [%s]:\n%s\n\n", item.name, result)
            results.append(result)
            self.errors_seen |= item.errors_seen

        if self.is_primary_cfg:
            self.gen_results_summary()
        self.gen_email_html_summary()

    def gen_results_summary(self):
        '''Public facing API to generate summary results for each IP/cfg file
        '''
        return

    def _get_results_page_link(self, link_text):
        if not self.args.publish:
            return link_text
        results_page_url = self.results_server_page.replace(
            self.results_server_prefix, self.results_server_url_prefix)
        return "[%s](%s)" % (link_text, results_page_url)

    def gen_email_html_summary(self):
        if self.is_primary_cfg:
            # user can customize email content by using email_summary_md,
            # otherwise default to send out results_summary_md
            gen_results = self.email_summary_md or self.results_summary_md
        else:
            gen_results = self.email_results_md or self.results_md
        results_html = md_results_to_html(self.results_title, self.css_file, gen_results)
        results_html_file = self.scratch_root + "/email.html"
        f = open(results_html_file, 'w')
        f.write(results_html)
        f.close()
        log.info("[results summary]: %s [%s]", "generated for email purpose", results_html_file)

    def _publish_results(self):
        '''Publish results to the opentitan web server.
        Results are uploaded to {results_server_path}/latest/results.
        If the 'latest' directory exists, then it is renamed to its 'timestamp' directory.
        If the list of directories in this area is > 14, then the oldest entry is removed.
        Links to the last 7 regression results are appended at the end if the results page.
        '''
        if which('gsutil') is None or which('gcloud') is None:
            log.error(
                "Google cloud SDK not installed! Cannot access the results server"
            )
            return

        # Construct the paths
        results_page_url = self.results_server_page.replace(
            self.results_server_prefix, self.results_server_url_prefix)

        # Timeformat for moving the dir
        tf = "%Y.%m.%d_%H.%M.%S"

        # Extract the timestamp of the existing self.results_server_page
        cmd = self.results_server_cmd + " ls -L " + self.results_server_page + \
            " | grep \'Creation time:\'"

        log.log(VERBOSE, cmd)
        cmd_output = subprocess.run(cmd,
                                    shell=True,
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.DEVNULL)
        log.log(VERBOSE, cmd_output.stdout.decode("utf-8"))
        old_results_ts = cmd_output.stdout.decode("utf-8")
        old_results_ts = old_results_ts.replace("Creation time:", "")
        old_results_ts = old_results_ts.strip()

        # Move the 'latest' to its timestamp directory if lookup succeeded
        if cmd_output.returncode == 0:
            try:
                if old_results_ts != "":
                    ts = datetime.datetime.strptime(
                        old_results_ts, "%a, %d %b %Y %H:%M:%S %Z")
                    old_results_ts = ts.strftime(tf)
            except ValueError as e:
                log.error(
                    "%s: \'%s\' Timestamp conversion value error raised!", e)
                old_results_ts = ""

            # If the timestamp conversion failed - then create a dummy one with
            # yesterday's date.
            if old_results_ts == "":
                log.log(VERBOSE,
                        "Creating dummy timestamp with yesterday's date")
                ts = datetime.datetime.now(
                    datetime.timezone.utc) - datetime.timedelta(days=1)
                old_results_ts = ts.strftime(tf)

            old_results_dir = self.results_server_path + "/" + old_results_ts
            cmd = (self.results_server_cmd + " mv " + self.results_server_dir +
                   " " + old_results_dir)
            log.log(VERBOSE, cmd)
            cmd_output = subprocess.run(cmd,
                                        shell=True,
                                        stdout=subprocess.PIPE,
                                        stderr=subprocess.DEVNULL)
            log.log(VERBOSE, cmd_output.stdout.decode("utf-8"))
            if cmd_output.returncode != 0:
                log.error("Failed to mv old results page \"%s\" to \"%s\"!",
                          self.results_server_dir, old_results_dir)

        # Do an ls in the results root dir to check what directories exist.
        results_dirs = []
        cmd = self.results_server_cmd + " ls " + self.results_server_path
        log.log(VERBOSE, cmd)
        cmd_output = subprocess.run(args=cmd,
                                    shell=True,
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.DEVNULL)
        log.log(VERBOSE, cmd_output.stdout.decode("utf-8"))
        if cmd_output.returncode == 0:
            # Some directories exist. Check if 'latest' is one of them
            results_dirs = cmd_output.stdout.decode("utf-8").strip()
            results_dirs = results_dirs.split("\n")
        else:
            log.log(VERBOSE, "Failed to run \"%s\"!", cmd)

        # Start pruning
        log.log(VERBOSE, "Pruning %s area to limit last 7 results",
                self.results_server_path)

        rdirs = []
        for rdir in results_dirs:
            dirname = rdir.replace(self.results_server_path, '')
            dirname = dirname.replace('/', '')
            if dirname == "latest":
                continue
            rdirs.append(dirname)
        rdirs.sort(reverse=True)

        rm_cmd = ""
        history_txt = "\n## Past Results\n"
        history_txt += "- [Latest](" + results_page_url + ")\n"
        if len(rdirs) > 0:
            for i in range(len(rdirs)):
                if i < 7:
                    rdir_url = self.results_server_path + '/' + rdirs[
                        i] + "/" + self.results_server_html
                    rdir_url = rdir_url.replace(self.results_server_prefix,
                                                self.results_server_url_prefix)
                    history_txt += "- [{}]({})\n".format(rdirs[i], rdir_url)
                elif i > 14:
                    rm_cmd += self.results_server_path + '/' + rdirs[i] + " "

        if rm_cmd != "":
            rm_cmd = self.results_server_cmd + " -m rm -r " + rm_cmd + "; "

        # Append the history to the results.
        publish_results_md = self.publish_results_md or self.results_md
        publish_results_md = publish_results_md + history_txt

        # Publish the results page.
        # First, write the results html file temporarily to the scratch area.
        results_html_file = self.scratch_path + "/results_" + self.timestamp + ".html"
        f = open(results_html_file, 'w')
        f.write(
            md_results_to_html(self.results_title, self.css_file, publish_results_md))
        f.close()
        rm_cmd += "/bin/rm -rf " + results_html_file + "; "

        log.info("Publishing results to %s", results_page_url)
        cmd = (self.results_server_cmd + " cp " + results_html_file + " " +
               self.results_server_page + "; " + rm_cmd)
        log.log(VERBOSE, cmd)
        try:
            cmd_output = subprocess.run(args=cmd,
                                        shell=True,
                                        stdout=subprocess.PIPE,
                                        stderr=subprocess.STDOUT)
            log.log(VERBOSE, cmd_output.stdout.decode("utf-8"))
        except Exception as e:
            log.error("%s: Failed to publish results:\n\"%s\"", e, str(cmd))

    def publish_results(self):
        '''Public facing API for publishing results to the opentitan web server.
        '''
        for item in self.cfgs:
            item._publish_results()

        if self.is_primary_cfg:
            self.publish_results_summary()

    def publish_results_summary(self):
        '''Public facing API for publishing md format results to the opentitan web server.
        '''
        results_html_file = "summary_" + self.timestamp + ".html"
        results_page_url = self.results_summary_server_page.replace(
            self.results_server_prefix, self.results_server_url_prefix)

        # Publish the results page.
        # First, write the results html file temporarily to the scratch area.
        f = open(results_html_file, 'w')
        f.write(
            md_results_to_html(self.results_title, self.css_file, self.results_summary_md))
        f.close()
        rm_cmd = "/bin/rm -rf " + results_html_file + "; "

        log.info("Publishing results summary to %s", results_page_url)
        cmd = (self.results_server_cmd + " cp " + results_html_file + " " +
               self.results_summary_server_page + "; " + rm_cmd)
        log.log(VERBOSE, cmd)
        try:
            cmd_output = subprocess.run(args=cmd,
                                        shell=True,
                                        stdout=subprocess.PIPE,
                                        stderr=subprocess.STDOUT)
            log.log(VERBOSE, cmd_output.stdout.decode("utf-8"))
        except Exception as e:
            log.error("%s: Failed to publish results:\n\"%s\"", e, str(cmd))

    def has_errors(self):
        return self.errors_seen