from __future__ import annotations

from pathlib import Path
from typing import Any

import pandas as pd

from .adapter import prepare_from_archive, prepare_from_source
from .common import profile_for_pubtime


COMPARATOR_FIELDS = (
    "phase",
    "primary_purpose",
    "intervention_model",
    "allocation",
    "masking",
    "gender",
    "number_of_arms",
    "has_dmc",
    "has_us_facility",
)


def summarize_from_archive(profile: dict[str, Any], project_root: Path) -> dict[str, Any]:
    prepared, source_label, source_type = prepare_from_archive(profile.get("domain", ""), project_root)
    return _summarize_prepared(profile, prepared, source_label, source_type)


def summarize_from_zip(profile: dict[str, Any], zip_path: Path) -> dict[str, Any]:
    prepared, source_label, source_type = prepare_from_source(profile.get("domain", ""), zip_path, zip_path.name)
    return _summarize_prepared(profile, prepared, source_label, source_type)


def _summarize_prepared(
    profile: dict[str, Any],
    prepared,
    source_label: str,
    source_type: str,
) -> dict[str, Any]:
    rows = _frame_to_rows(prepared.survival_df)
    pubtime_profile = profile_for_pubtime(profile)
    matched = _matched_rows(pubtime_profile, rows)
    comparator_rows = matched if len(matched) >= 20 else rows

    return {
        "domain": prepared.domain,
        "source_archive": source_label,
        "source_type": source_type,
        "raw_rows": prepared.raw_rows,
        "analytic_rows": prepared.analytic_rows,
        "domain_rows": prepared.survival_rows,
        "matched_rows": len(matched),
        "used_rows": len(comparator_rows),
        "match_strategy": _match_strategy(len(matched)),
        "pubtime_preparation": {
            "predictors": list(prepared.predictors),
            "high_missing_predictors": list(prepared.high_missing_predictors),
            "cox_model": prepared.cox_model_status,
        },
        "summary": _summarize_rows(comparator_rows),
        "comparison": _compare_profile(profile, comparator_rows),
        "examples": _example_rows(pubtime_profile, comparator_rows),
    }


def _frame_to_rows(frame: pd.DataFrame) -> tuple[dict[str, Any], ...]:
    if frame.empty:
        return tuple()

    wanted = {
        "nct_id",
        "brief_title",
        "phase",
        "primary_purpose",
        "intervention_model",
        "allocation",
        "masking",
        "enrollment",
        "actual_duration",
        "number_of_facilities",
        "number_of_arms",
        "number_of_primary_outcomes_to_measure",
        "number_of_secondary_outcomes_to_measure",
        "has_dmc",
        "has_us_facility",
        "were_results_reported",
        "pub_date",
        "event_pub",
        "time_to_pub",
        "result_count",
    }
    available = [column for column in wanted if column in frame.columns]
    rows = frame[available].where(pd.notna(frame[available]), "").to_dict("records")
    return tuple(rows)


def _matched_rows(profile: dict[str, Any], rows: tuple[dict[str, Any], ...]) -> list[dict[str, Any]]:
    matches: list[dict[str, Any]] = []
    for row in rows:
        score = _match_score(profile, row)
        if score >= 3:
            row_with_score = dict(row)
            row_with_score["_match_score"] = score
            matches.append(row_with_score)

    matches.sort(key=lambda row: int(row.get("_match_score", 0)), reverse=True)
    return matches


def _match_score(profile: dict[str, Any], row: dict[str, Any]) -> int:
    score = 0
    for field in COMPARATOR_FIELDS:
        profile_value = profile.get(field)
        row_value = row.get(field)
        if profile_value is None or profile_value == "" or row_value == "":
            continue
        if field == "number_of_arms":
            if _to_float(profile_value) == _to_float(row_value):
                score += 1
            continue
        if str(profile_value).upper() == str(row_value).upper():
            score += 1
    return score


def _match_strategy(match_count: int) -> str:
    if match_count >= 20:
        return "matched_pubtime_prepared_fields"
    return "domain_fallback_too_few_matches"


def _summarize_rows(rows: list[dict[str, Any]] | tuple[dict[str, Any], ...]) -> dict[str, Any]:
    enrollments = [_to_float(row.get("enrollment")) for row in rows]
    durations = [_to_float(row.get("actual_duration")) for row in rows]
    facilities = [_to_float(row.get("number_of_facilities")) for row in rows]
    arms = [_to_float(row.get("number_of_arms")) for row in rows]
    primary_outcomes = [_to_float(row.get("number_of_primary_outcomes_to_measure")) for row in rows]
    secondary_outcomes = [_to_float(row.get("number_of_secondary_outcomes_to_measure")) for row in rows]
    time_to_pub = [_to_float(row.get("time_to_pub")) for row in rows]

    return {
        "median_enrollment": _median(enrollments),
        "median_duration_months": _median(durations),
        "median_facilities": _median(facilities),
        "median_arms": _median(arms),
        "median_primary_outcomes": _median(primary_outcomes),
        "median_secondary_outcomes": _median(secondary_outcomes),
        "median_time_to_publication_days": _median(time_to_pub),
        "publication_rate": _rate(rows, _has_publication),
        "results_reported_rate": _rate(rows, lambda row: _is_true(row.get("were_results_reported"))),
        "dmc_rate": _rate(rows, lambda row: _is_true(row.get("has_dmc"))),
        "us_facility_rate": _rate(rows, lambda row: _is_true(row.get("has_us_facility"))),
    }


def _compare_profile(
    profile: dict[str, Any], rows: list[dict[str, Any]] | tuple[dict[str, Any], ...]
) -> dict[str, Any]:
    summary = _summarize_rows(rows)
    flags: list[str] = []

    enrollment = _to_float(profile.get("enrollment"))
    median_enrollment = summary["median_enrollment"]
    if enrollment and median_enrollment:
        if enrollment >= median_enrollment * 1.5:
            flags.append("Planned enrollment is substantially above the comparator median.")
        elif enrollment <= median_enrollment * 0.5:
            flags.append("Planned enrollment is substantially below the comparator median.")

    facilities = _to_float(profile.get("number_of_facilities"))
    median_facilities = summary["median_facilities"]
    if facilities and median_facilities and facilities >= max(5, median_facilities * 2):
        flags.append("Planned site count is high relative to comparators.")

    arms = _to_float(profile.get("number_of_arms"))
    median_arms = summary["median_arms"]
    if arms and median_arms and arms >= max(4, median_arms * 2):
        flags.append("Planned arm count is high relative to comparators.")

    primary_outcomes = _to_float(profile.get("number_of_primary_outcomes"))
    median_primary = summary["median_primary_outcomes"]
    if primary_outcomes and median_primary and primary_outcomes >= max(3, median_primary * 2):
        flags.append("Primary outcome count is high relative to comparators.")

    secondary_outcomes = _to_float(profile.get("number_of_secondary_outcomes"))
    median_secondary = summary["median_secondary_outcomes"]
    if secondary_outcomes and median_secondary and secondary_outcomes >= max(6, median_secondary * 2):
        flags.append("Secondary outcome count is high relative to comparators.")

    dmc_rate = summary["dmc_rate"]
    if profile.get("has_dmc") is False and dmc_rate is not None and dmc_rate >= 0.5:
        flags.append("Most comparable trials have a DMC; this design does not.")

    if profile.get("allocation") == "RANDOMIZED" and profile.get("masking") == "NONE":
        flags.append("Randomized open-label design should be reviewed for bias and ascertainment risk.")

    if profile.get("criteria") and len(str(profile["criteria"]).split()) < 20:
        flags.append("Eligibility criteria are too short for strong complexity assessment.")

    priority = "standard"
    if len(flags) >= 3:
        priority = "high"
    elif flags:
        priority = "focused"

    return {
        "review_priority": priority,
        "flags": flags,
        "note": "This is a PubTime-prepared historical comparator, not a validated prediction model.",
    }


def _example_rows(
    profile: dict[str, Any], rows: list[dict[str, Any]] | tuple[dict[str, Any], ...]
) -> list[dict[str, Any]]:
    examples: list[dict[str, Any]] = []
    ranked = sorted(rows, key=lambda row: _match_score(profile, row), reverse=True)
    for row in ranked[:5]:
        examples.append(
            {
                "nct_id": row.get("nct_id"),
                "brief_title": row.get("brief_title"),
                "phase": row.get("phase"),
                "enrollment": _to_float(row.get("enrollment")),
                "facilities": _to_float(row.get("number_of_facilities")),
                "arms": _to_float(row.get("number_of_arms")),
                "published": _has_publication(row),
            }
        )
    return examples


def _median(values: list[float | None]) -> float | None:
    cleaned = [value for value in values if value is not None]
    if not cleaned:
        return None
    return round(float(pd.Series(cleaned).median()), 2)


def _rate(rows: list[dict[str, Any]] | tuple[dict[str, Any], ...], predicate) -> float | None:
    if not rows:
        return None
    return round(sum(1 for row in rows if predicate(row)) / len(rows), 3)


def _to_float(value: Any) -> float | None:
    if value is None or value == "":
        return None
    try:
        return float(value)
    except (TypeError, ValueError):
        return None


def _is_true(value: Any) -> bool:
    return str(value).strip().lower() == "true"


def _has_publication(row: dict[str, Any]) -> bool:
    if row.get("event_pub") != "":
        return _to_float(row.get("event_pub")) == 1
    if row.get("pub_date"):
        return True
    result_count = _to_float(row.get("result_count"))
    return bool(result_count and result_count > 0)