import base64
import dataclasses
import textwrap
from typing import List

from libkernelbot import consts
from libkernelbot.run_eval import CompileResult, EvalResult, FullResult, RunResult, SystemInfo
from libkernelbot.utils import format_time, limit_length


@dataclasses.dataclass
class Text:
    """
    Text represents markdown-formatted text to be added to the report.
    """

    text: str


@dataclasses.dataclass
class Log:
    """
    Log represents a potentially extensive log of some operation, such as
    stdout/stderr of the compiler or tester script.
    Logs will be automatically wrapped in code blocks, and prefixed with
    the given header. If `content` is too long to fit into a single discord
    message, it can be broken up automatically (and reasonably) into multiple
    smaller messages.
    """

    header: str
    content: str


@dataclasses.dataclass
class Link:
    """
    Link represents a link in the profiling report, to result data
    which can be downloaded by clicking it.
    """

    title: str
    text: str
    url: str


@dataclasses.dataclass
class File:
    """
    Link represents a file that gets attached to the report.
    """

    name: str
    message: str
    content: bytes


class RunResultReport:
    def __init__(self, data=None):
        self.data: List[Text | Log | Link | File] = data or []

    def add_text(self, section: str):
        self.data.append(Text(section))

    def add_log(self, header: str, log: str):
        self.data.append(Log(header, log))

    def add_link(self, title: str, text: str, url: str):
        self.data.append(Link(title, text, url))

    def add_file(self, name: str, message: str, content: bytes):
        self.data.append(File(name, message, content))

    def __repr__(self):
        return f"RunResultReport(data={self.data})"


def _generate_compile_report(reporter: "RunResultReport", comp: CompileResult):
    message = ""
    if not comp.nvcc_found:
        message += "# Compilation failed\nNVCC could not be found.\n"
        message += "This indicates a bug in the runner configuration, _not in your code_.\n"
        message += "Please notify the server admins of this problem"
        reporter.add_text(message)
        return

    # ok, we found nvcc
    message += "# Compilation failed\n"
    message += "Command "
    message += f"```bash\n>{limit_length(comp.command, 1000)}```\n"
    message += f"exited with code **{comp.exit_code}**."
    reporter.add_text(message)

    reporter.add_log("Compiler stderr", comp.stderr.strip())

    if len(comp.stdout.strip()) > 0:
        reporter.add_log("Compiler stdout", comp.stdout.strip())


def _generate_crash_report(reporter: "RunResultReport", run: RunResult):
    message = "# Running failed\n"
    message += "Command "
    message += f"```bash\n{limit_length(run.command, 1000)}```\n"
    if run.exit_code == consts.ExitCode.TIMEOUT_EXPIRED:
        message += f"**timed out** after {float(run.duration):.2f} seconds."
    else:
        message += (
            f"exited with error code **{run.exit_code}** after {float(run.duration):.2f} seconds."
        )
    reporter.add_text(message)

    if len(run.stderr.strip()) > 0:
        reporter.add_log("Program stderr", run.stderr.strip())

    if len(run.stdout.strip()) > 0:
        reporter.add_log("Program stdout", run.stdout.strip())


def _generate_test_report(reporter: "RunResultReport", run: RunResult):
    message = "# Testing failed\n"
    message += "Command "
    message += f"```bash\n{limit_length(run.command, 1000)}```\n"
    message += f"ran successfully in {run.duration:.2f} seconds, but did not pass all tests.\n"
    reporter.add_text(message)

    # Generate a test
    reporter.add_log("Test log", make_test_log(run))

    if len(run.stderr.strip()) > 0:
        reporter.add_log("Program stderr", run.stderr.strip())

    if len(run.stdout.strip()) > 0:
        reporter.add_log("Program stdout", run.stdout.strip())


def _short_fail_reason(run: RunResult):
    """
    Translate the exit code of `run` into a short error identifier.
    """
    if run.exit_code == consts.ExitCode.TIMEOUT_EXPIRED:
        return " (timeout)"
    elif run.exit_code == consts.ExitCode.CUDA_FAIL:
        return " (cuda api error)"
    elif run.exit_code != consts.ExitCode.VALIDATE_FAIL:
        return f" (internal error {run.exit_code})"
    else:
        return ""


def make_short_report(runs: dict[str, EvalResult], full=True) -> list[str]:  # noqa: C901
    """
    Creates a minimalistic report for `runs`,
    returned as a list of status strings
    """
    any_compile = False
    result = []
    for r in runs.values():
        if r.compilation is not None:
            any_compile = True
            if not r.compilation.success:
                return ["❌ Compilation failed"]

    if any_compile:
        result.append("✅ Compilation successful")

    if "test" in runs:
        test_run = runs["test"].run
        if not test_run.success:
            result.append("❌ Running tests failed" + _short_fail_reason(test_run))
            return result
        elif not test_run.passed:
            result.append("❌ Testing failed")
            return result
        else:
            result.append("✅ Testing successful")
    elif full:
        result.append("❌ Tests missing")

    if "benchmark" in runs:
        bench_run = runs["benchmark"].run
        if not bench_run.success:
            result.append("❌ Running benchmarks failed" + _short_fail_reason(bench_run))
            return result
        elif not bench_run.passed:
            result.append("❌ Benchmarking failed")
            return result
        else:
            result.append("✅ Benchmarking successful")
    elif full:
        result.append("❌ Benchmarks missing")

    profile_runs = [v for k, v in runs.items() if k.startswith("profile")]
    if len(profile_runs) > 0:
        for prof_run in profile_runs:
            bench_run = prof_run.run
            if not bench_run.success:
                result.append("❌ Running profile failed" + _short_fail_reason(bench_run))
                return result
            elif not bench_run.passed:
                result.append("❌ Profiling failed")
                return result
            else:
                result.append("✅ Profiling successful")

    if "leaderboard" in runs:
        lb_run = runs["leaderboard"].run
        if not lb_run.success:
            result.append("❌ Running leaderboard failed" + _short_fail_reason(lb_run))
        elif not lb_run.passed:
            result.append("❌ Leaderboard run failed")
        else:
            result.append("✅ Leaderboard run successful")
    elif full:
        result.append("❌ Leaderboard missing")
    return result


def make_test_log(run: RunResult) -> str:
    test_log = []
    for i in range(len(run.result)):
        status = run.result.get(f"test.{i}.status", None)
        spec = run.result.get(f"test.{i}.spec", "<Error>")
        if status is None:
            break
        if status == "pass":
            test_log.append(f"✅ {spec}")
            msg = run.result.get(f"test.{i}.message", None)
            if msg:
                test_log.append(f"> {msg.replace('\\n', '\n')}")
        elif status == "fail":
            test_log.append(f"❌ {spec}")
            error = run.result.get(f"test.{i}.error", "No error information available")
            if error:
                test_log.append(f"> {error.replace('\\n', '\n')}")
    if len(test_log) > 0:
        return str.join("\n", test_log)
    else:
        return "❗ Could not find any test cases"


def make_benchmark_log(run: RunResult) -> str:
    num_bench = int(run.result.get("benchmark-count", 0))

    def log_one(base_name):
        status = run.result.get(f"{base_name}.status")
        spec = run.result.get(f"{base_name}.spec")
        if status == "fail":
            bench_log.append(f"❌ {spec} failed testing:\n")
            bench_log.append(run.result.get(f"{base_name}.error"))
            return

        mean = run.result.get(f"{base_name}.mean")
        err = run.result.get(f"{base_name}.err")
        best = run.result.get(f"{base_name}.best")
        worst = run.result.get(f"{base_name}.worst")

        bench_log.append(f"{spec}")
        bench_log.append(f" ⏱ {format_time(mean, err)}")
        if best is not None and worst is not None:
            bench_log.append(f" ⚡ {format_time(best)} 🐌 {format_time(worst)}")

    bench_log = []
    for i in range(num_bench):
        log_one(f"benchmark.{i}")
        bench_log.append("")

    if len(bench_log) > 0:
        return "\n".join(bench_log)
    else:
        return "❗ Could not find any benchmarks"


def make_profile_log(run: RunResult) -> str:
    num_bench = int(run.result.get("benchmark-count", 0))

    def log_one(base_name):
        report: str = run.result.get(f"{base_name}.report")
        report = base64.b64decode(report.encode("utf-8"), b"+*").decode("utf-8")
        report = textwrap.indent(report, "  ")
        bench_log.append(report)

    bench_log = []
    for i in range(num_bench):
        log_one(f"benchmark.{i}")
        bench_log.append("")

    if len(bench_log) > 0:
        return "\n".join(bench_log)
    else:
        return "❗ Could not find any profiling data"


def generate_system_info(system: SystemInfo):
    return f"""
Running on:
* GPU: `{system.gpu}`
* CPU: `{system.cpu}`
* Device count: `{system.device_count}`
* Requeues: `{system.requeues}`
* Runtime: `{system.runtime}`
* Platform: `{system.platform}`
* Torch: `{system.torch}`
* Hostname: `{system.hostname}`
"""


def _handle_crash_report(report: RunResultReport, run_result: EvalResult):
    if run_result.compilation is not None and not run_result.compilation.success:
        _generate_compile_report(report, run_result.compilation)
        return True

    if not run_result.run.success:
        _generate_crash_report(report, run_result.run)
        return True

    return False


def _shortname(spec: str):
    return spec.replace(": ", "=").replace("; ", "_")


def generate_report(result: FullResult, extra_text: str = "") -> RunResultReport:  # noqa: C901
    runs = result.runs
    report = RunResultReport()
    if extra_text and len(extra_text.strip()) > 0:
        report.add_text(extra_text)
    report.add_text(generate_system_info(result.system))

    if "test" in runs:
        test_run = runs["test"]
        if _handle_crash_report(report, test_run):
            return report

        test_run = test_run.run
        if not test_run.passed:
            _generate_test_report(report, test_run)
            return report
        else:
            num_tests = int(test_run.result.get("test-count", 0))
            report.add_log(f"✅ Passed {num_tests}/{num_tests} tests", make_test_log(test_run))

    if "benchmark" in runs:
        bench_run = runs["benchmark"]
        if _handle_crash_report(report, bench_run):
            return report

        report.add_log(
            "Benchmarks",
            make_benchmark_log(bench_run.run),
        )

    profile_runs = [v for k, v in runs.items() if k.startswith("profile")]
    if len(profile_runs) > 0:
        for prof_run in profile_runs:
            if _handle_crash_report(report, prof_run):
                return report

            if prof_run.profile.trace is not None:
                report.add_log(
                    f"Profiling {prof_run.run.result.get('benchmark.0.spec')}",
                    make_profile_log(prof_run.run),
                )

                if prof_run.profile.download_url is not None:
                    report.add_link(
                        f"{prof_run.profile.profiler} profiling output",
                        "Download from GitHub",
                        prof_run.profile.download_url,
                    )

        for prof_run in profile_runs:
            if prof_run.profile is not None:
                if prof_run.profile.trace is not None:
                    report.add_file(
                        f"profile-{_shortname(prof_run.run.result.get('benchmark.0.spec'))}.zip",
                        f"{prof_run.profile.profiler} report - "
                        + prof_run.run.result.get("benchmark.0.spec"),
                        base64.b64decode(prof_run.profile.trace),
                    )

    if "leaderboard" in runs:
        bench_run = runs["leaderboard"]
        if _handle_crash_report(report, bench_run):
            return report

        bench_run = bench_run.run
        report.add_log(
            "Ranked Benchmark",
            make_benchmark_log(bench_run),
        )

    if len(runs) == 1:
        run = next(iter(runs.values()))
        if len(run.run.stderr.strip()) > 0:
            report.add_log("Program stderr", run.run.stderr.strip())

        if len(run.run.stdout.strip()) > 0:
            report.add_log("Program stdout", run.run.stdout.strip())

    return report


class MultiProgressReporter:
    async def show(self, title: str):
        raise NotImplementedError()

    def add_run(self, title: str) -> "RunProgressReporter":
        raise NotImplementedError()

    def make_message(self):
        raise NotImplementedError()


class RunProgressReporter:
    def __init__(self, title: str):
        # short report
        self.title = title
        self.lines = []

    async def push(self, content: str | list[str]):
        if isinstance(content, str):
            self.lines.append(f"> {content}")
        else:
            for line in content:
                self.lines.append(f"> {line}")
        await self._update_message()

    async def update(self, new_content: str):
        self.lines[-1] = f"> {new_content}"
        await self._update_message()

    async def update_title(self, new_title):
        self.title = new_title
        await self._update_message()

    def get_message(self):
        return str.join("\n", [f"**{self.title}**"] + self.lines)

    async def display_report(self, title: str, report: RunResultReport):
        raise NotImplementedError()

    async def _update_message(self):
        raise NotImplementedError()