#!/usr/bin/env python3
"""
Generate reports from current logs
"""

import argparse
import os
import re

os.chdir(os.path.join(os.path.dirname(os.path.abspath(__file__)), ".."))

LOGS_FOLDER = "logs"
REPORTS_FOLDER = "reports"
REPORT_FILENAME = "report.log"
SINGLE_REPORT_FILENAME = f"{REPORTS_FOLDER}/report.log"
SUMMARY_FILENAME = f"{REPORTS_FOLDER}/report-summary.log"
DRC_FILENAME = "5_route_drc.rpt"
LAST_EXPECTED_LOG = ["6_report.log", "generate_abstract.log"]
METRICS_LOG_FMT = "metadata-generate.log"
METRICS_CHECK_FMT = "{}/metadata-check.log"
REGEX_ERROR = re.compile(r"^\[error ?(\w+-\d+)?\]", re.IGNORECASE)
REGEX_WARNING = re.compile(r"^\[warning ?(\w+-\d+)?\]", re.IGNORECASE)
SKIPPED_FLOW_VARIANT_KEYWORDS = ["test", "tune"]
STATUS_GREEN = "Passing"
STATUS_RED = "Failing"

HELP_TEXT = """
Scans "./logs" and "./reports" folders for errors and warnings.
"""
parser = argparse.ArgumentParser(description=HELP_TEXT)

HELP_TEXT = """
Level 0: report error message id and drc types.
Level 1: report full error messages.
Level 2: report full error messages and warning messages id.
Level 3: report full error messages and full warning messages.
"""
parser.add_argument(
    "--verbose", "-v", required=False, default=0, action="count", help=HELP_TEXT
)

parser.add_argument(
    "--quiet",
    "-q",
    required=False,
    default=False,
    action="store_true",
    help="Do not print report to stdout.",
)

parser.add_argument(
    "--summary",
    "-s",
    required=False,
    default=False,
    action="store_true",
    help="Only write summary file.",
)

args = parser.parse_args()


def parse_messages(filename, print_missing=True):
    """
    TODO: docs
    """
    errors = list()
    warnings = list()
    try:
        with open(filename, "r") as file:
            lines = file.readlines()
        for line in lines:
            if re.search(REGEX_ERROR, line):
                errors.append(line.strip())
            elif re.search(REGEX_WARNING, line):
                warnings.append(line.strip())
    except BaseException:
        if print_missing:
            print(f"Failed to open {filename}.")
    return errors, warnings


def append_text(list_, text, sup, regex, verbose):
    """
    TODO
    """
    if len(list_) == 0:
        return text
    text += f"  Found {len(list_)} {sup}.\n"
    if verbose >= 1:  # print full message
        for item in list_:
            text += f"      {item}\n"
    else:  # only print the id
        set_ = set()
        long_set = set()
        for item in list_:
            message = re.match(regex, item).group(1)
            if message is None:
                message = item
            if len(message) > 10:  # considering a std msg id XYZ-0000
                long_set.add(message)
            else:
                set_.add(message)
        set_ = sorted(set_, reverse=True)
        if set_:
            text += f"      {', '.join(set_)}\n"
        for item in long_set:
            text += f"      {item}\n"
    return text


def gen_report(name, data):
    """
    TODO: docs
    """

    if args.verbose >= 2 or data["status"] != STATUS_GREEN:
        output = f"{name}\n"
        if data["finished"]:
            output += "  Flow reached last stage.\n"
        else:
            output += f"  Last log file {data['last_log']}\n"
    else:
        output = ""

    output = append_text(
        data["log_errors"], output, "errors in the logs", REGEX_ERROR, args.verbose
    )
    output = append_text(
        data["metrics_logs_errors"],
        output,
        "errors in the metrics logs",
        REGEX_ERROR,
        args.verbose,
    )
    output = append_text(
        data["metrics_errors"], output, "metrics failures", REGEX_ERROR, args.verbose
    )
    output = append_text(
        data["calibre_errors"], output, "calibre failures", REGEX_ERROR, args.verbose
    )

    if args.verbose >= 2:
        output = append_text(
            data["log_warnings"],
            output,
            "warnings in the logs",
            REGEX_WARNING,
            args.verbose - 2,
        )
        output = append_text(
            data["metrics_logs_warnings"],
            output,
            "warnings in the metrics logs",
            REGEX_WARNING,
            args.verbose - 2,
        )
        output = append_text(
            data["metrics_warnings"],
            output,
            "metrics warnings",
            REGEX_WARNING,
            args.verbose - 2,
        )
        output = append_text(
            data["calibre_warnings"],
            output,
            "calibre warnings",
            REGEX_WARNING,
            args.verbose - 2,
        )

    if len(data["drcs"].keys()) > 0:
        if data["status"] == STATUS_GREEN:
            output += "  Design has the violations under the allowed limit: "
        else:
            output += "  Design has the violations over the allowed limit: "
        for drc, count in data["drcs"].items():
            output += f"{drc} ({count}) "
        output += "\n"

    return output.strip()


def write_report(path, content):
    """
    TODO: docs
    """
    content = content.strip()
    with open(path, "w") as file:
        file.write(content)
    if args.verbose:
        content += f"\n  Generated report file: {path}\n"
    with open(SINGLE_REPORT_FILENAME, "a") as file:
        file.write(content)
        file.write("\n")
    if not args.quiet and content != "":
        print(content)


def get_summary(status, text):
    """
    TODO: docs
    """
    tmp = ""
    for name, data in design_list.items():
        if data["status"] == status:
            content = gen_report(name, data)
            if content != "":
                tmp += content + "\n"
                # add empty line for readability
                if args.verbose >= 2 or status == STATUS_RED:
                    tmp += "\n"
    if tmp != "":
        text += "-" * 30 + "\n"
        text += " " * 7 + f"{status} designs\n"
        text += "-" * 30 + "\n"
        text += tmp

    return text


def write_summary():
    """
    Write summary and individual report files with data on design_list
    """
    summary = "\n"
    summary += "=" * 60 + "\n"
    summary += " " * 26 + "SUMMARY\n"
    summary += "=" * 60 + "\n"
    summary += f"\nNumber of designs: {len(design_list.keys())}\n\n"

    summary = get_summary(STATUS_RED, summary)
    summary += "\n"
    summary = get_summary(STATUS_GREEN, summary)

    if not args.quiet:
        if os.path.isfile(SUMMARY_FILENAME):
            print(f"Overwriting report summary {SUMMARY_FILENAME}.")
        print(summary)
    with open(SUMMARY_FILENAME, "w") as file:
        file.write(summary)
    if not args.quiet and args.verbose:
        print("Generated report summary file:", SUMMARY_FILENAME)


design_list = dict()

for log_dir, dirs, files in sorted(os.walk(LOGS_FOLDER, topdown=False)):
    dir_list = log_dir.split(os.sep)
    # Handles autotuner folders, which do not have `report.log` natively.
    # TODO: Can we log something for autotuner?
    if len(dir_list) != 4 or any(
        word in dir_list[-1] for word in SKIPPED_FLOW_VARIANT_KEYWORDS
    ):
        continue
    report_dir = log_dir.replace(LOGS_FOLDER, REPORTS_FOLDER)

    # basic info about current design
    platform, design, variant = dir_list[1:]
    d = dict()
    d["output_file"] = os.path.join(report_dir, REPORT_FILENAME)

    # check if design ran to completion without errors or warnings
    d["log_errors"] = list()
    d["log_warnings"] = list()
    d["last_log"] = ""
    for name_ in sorted(files):
        temp_e, temp_w = parse_messages(os.path.join(log_dir, name_))
        d["log_errors"] += temp_e
        d["log_warnings"] += temp_w
        if name_.endswith(".log"):
            d["last_log"] = name_
    d["finished"] = d["last_log"] in LAST_EXPECTED_LOG

    # check if metrics generation had issues
    d["metrics_logs_errors"], d["metrics_logs_warnings"] = parse_messages(
        os.path.join(report_dir, METRICS_LOG_FMT),
        print_missing=d["finished"],
    )

    # check if metrics passed
    d["metrics_errors"], d["metrics_warnings"] = parse_messages(
        METRICS_CHECK_FMT.format(report_dir), print_missing=d["finished"]
    )

    # check if calibre was run and if drc check passed
    d["calibre_errors"], d["calibre_warnings"] = parse_messages(
        os.path.join(log_dir, "calibre/save-to-drc-db.log"), print_missing=False
    )

    # check if there were drc violations
    d["drcs"] = dict()
    try:
        drc_report_file = os.path.join(report_dir, DRC_FILENAME)
        with open(drc_report_file, "r") as file_:
            for line_ in file_.readlines():
                if "violation type:" in line_:
                    type_ = line_.split("violation type:", 1)[1].strip()
                    if type_ in d["drcs"].keys():
                        d["drcs"][type_] += 1
                    else:
                        d["drcs"][type_] = 1
    except BaseException:
        if d["finished"]:
            print(f"Failed to open {DRC_FILENAME}.")

    if d["log_errors"] or d["metrics_errors"] or d["calibre_errors"]:
        d["status"] = STATUS_RED
    else:
        if not d["finished"]:
            d["status"] = STATUS_RED
            last_lines = "Could not find last lines of the log file."
            with open(os.path.join(log_dir, d["last_log"]), "r") as last_file:
                last_lines = last_file.readlines()[-10:]
                last_lines = "          ".join(last_lines)
            message = "[ERROR CI-0000] No error message found. "
            message += "Here are the last 10 lines of the log.\n"
            d["log_errors"] = [message + last_lines]
        else:
            d["status"] = STATUS_GREEN

    design_list[f"{platform} {design} ({variant})"] = d

if not os.path.isdir(REPORTS_FOLDER):
    os.mkdir(REPORTS_FOLDER)

if args.summary:
    write_summary()
else:
    if os.path.isfile(SINGLE_REPORT_FILENAME):
        if not args.quiet:
            print(f"Overwriting report {SINGLE_REPORT_FILENAME}.")
        os.remove(SINGLE_REPORT_FILENAME)
    for name_, data_ in design_list.items():
        write_report(data_["output_file"], gen_report(name_, data_))