"""Terminal graders for the seeded DataOpsEnv benchmark."""

from __future__ import annotations

import ast
import json
import logging
import os
import sqlite3
from typing import Any

from server.dataops_env_environment import DataOpsEnvironment
from server.safe_exec import run_python_code, run_python_script
from server.task_specs import (
    build_task_3_report,
    normalize_task_2_output_rows,
    normalize_task_3_rows,
    report_matches_expected,
    task_3_data_matches_expected,
    task_3_semantic_match_fraction_rows,
    task_3_semantic_match_fraction_text,
)

logger = logging.getLogger(__name__)
SCRIPT_TIMEOUT_S = 10
INTERNAL_STDOUT_LIMIT = 50_000
INTERNAL_STDERR_LIMIT = 10_000


def evaluate_task(task_id: str, env: DataOpsEnvironment) -> dict[str, Any]:
    graders = {
        "task_1_easy_anomaly": _grade_task_1,
        "task_2_medium_syntax": _grade_task_2,
        "task_3_hard_e2e": _grade_task_3,
    }
    grader = graders.get(task_id)
    if grader is None:
        return {"task_id": task_id, "score": 0.0, "details": {"error": "Unknown task"}}

    score, details = grader(env)
    return {"task_id": task_id, "score": round(score, 2), "details": details}


def _grade_task_1(env: DataOpsEnvironment) -> tuple[float, dict[str, Any]]:
    if env.scenario.task_1 is None:
        return 0.0, {"error": "Task 1 scenario missing."}

    try:
        actual_rows = _current_transactions_rows(env.db_path)
    except Exception:
        logger.exception("Task 1 grading error")
        return 0.0, {"error": "Internal grading error."}

    expected_rows = list(env.scenario.task_1.expected_rows)
    corrupted_ids = set(env.scenario.task_1.corrupted_row_ids)
    actual_ids = {row["id"] for row in actual_rows}
    expected_ids = {row["id"] for row in expected_rows}
    corrupted_remaining = sorted(actual_ids & corrupted_ids)
    rewritten_corrupted = [
        row for row in actual_rows if row["id"] in corrupted_ids and row["amount"] is not None
    ]
    valid_rows_intact = all(
        any(actual == expected for actual in actual_rows) for expected in expected_rows
    )

    details: dict[str, Any] = {
        "expected_row_ids": sorted(expected_ids),
        "actual_row_ids": sorted(actual_ids),
        "corrupted_row_ids": sorted(corrupted_ids),
        "corrupted_remaining": corrupted_remaining,
        "valid_rows_intact": valid_rows_intact,
    }

    if actual_rows == expected_rows:
        details["reason"] = "Perfect - corrupted rows were deleted and all valid rows were preserved."
        details["components"] = {
            "exact_cleanup": {"score": 1.0, "max": 1.0, "passed": True},
        }
        return 1.0, details

    if rewritten_corrupted:
        details["reason"] = "Corrupted rows were rewritten instead of being deleted."
        details["components"] = {
            "exact_cleanup": {"score": 0.0, "max": 1.0, "passed": False},
        }
        return 0.0, details

    if valid_rows_intact and corrupted_remaining:
        fraction_removed = 1.0 - (len(corrupted_remaining) / max(len(corrupted_ids), 1))
        score = round(0.25 * max(fraction_removed, 0.0), 4)
        details["reason"] = "Some corrupted rows were removed, but cleanup is incomplete."
        details["components"] = {
            "partial_cleanup": {"score": score, "max": 0.25, "passed": False},
        }
        return score, details

    details["reason"] = "The transaction table does not match the required cleaned state."
    details["components"] = {
        "exact_cleanup": {"score": 0.0, "max": 1.0, "passed": False},
    }
    return 0.0, details


def _grade_task_2(env: DataOpsEnvironment) -> tuple[float, dict[str, Any]]:
    if env.scenario.task_2 is None:
        return 0.0, {"error": "Task 2 scenario missing."}

    script = os.path.join(env.workspace_dir, "broken_pipeline.py")
    if not os.path.isfile(script):
        return 0.0, {
            "reason": "broken_pipeline.py not found.",
            "components": {
                "script_present": {"score": 0.0, "max": 1.0, "passed": False},
            },
        }

    try:
        with open(script, encoding="utf-8") as f:
            source = f.read()
        static = _inspect_task_2_source(source)
        main_result = run_python_script(
            "broken_pipeline.py",
            cwd=env.workspace_dir,
            args=[],
            timeout_s=SCRIPT_TIMEOUT_S,
            stdout_limit=INTERNAL_STDOUT_LIMIT,
            stderr_limit=INTERNAL_STDERR_LIMIT,
        )
        visible_result = _run_task_2_case_check(
            env.workspace_dir,
            env.scenario.task_2.visible_batch,
            env.scenario.task_2.visible_expected,
        )
        hidden_result = _run_task_2_hidden_tests(
            env.workspace_dir,
            env.scenario.task_2.hidden_cases,
            env.scenario.task_2.hidden_expected,
        )
    except Exception:
        logger.exception("Task 2 grading error")
        return 0.0, {"error": "Internal grading error."}

    if main_result.timed_out or visible_result["timed_out"] or hidden_result["timed_out"]:
        return 0.0, {"reason": "Script timed out.", "components": {}}

    hidden_score = round(0.60 * hidden_result["pass_fraction"], 4)
    visible_score = 0.25 if visible_result["passed"] and main_result.returncode == 0 else 0.0
    execution_score = 0.15 if env.evidence.get("task_2", {}).get("verified_fix") else 0.0
    components: dict[str, Any] = {
        "hidden_functional": {
            "score": hidden_score,
            "max": 0.60,
            "passed": hidden_result["passed"],
        },
        "visible_pipeline": {
            "score": visible_score,
            "max": 0.25,
            "passed": visible_result["passed"] and main_result.returncode == 0,
        },
        "execution_provenance": {
            "score": execution_score,
            "max": 0.15,
            "passed": bool(env.evidence.get("task_2", {}).get("verified_fix")),
        },
    }
    score = round(sum(component["score"] for component in components.values()), 4)
    details = {
        "main_exit_code": main_result.returncode,
        "main_stdout": main_result.stdout[:500],
        "main_stderr": main_result.stderr[:500],
        "visible_batch_ok": visible_result["passed"],
        "hidden_tests_passed": hidden_result["passed"],
        "hidden_pass_fraction": hidden_result["pass_fraction"],
        "hidden_case_passes": hidden_result["case_passes"],
        "static_checks": static,
        "components": components,
    }

    if score == 1.0:
        details["reason"] = "Seeded hidden tests and the visible verification run both pass."
    elif hidden_result["passed"] and main_result.returncode == 0:
        details["reason"] = "The ETL transform is correct, but the agent never verified it through the run action."
    elif hidden_result["pass_fraction"] > 0 and main_result.returncode == 0:
        details["reason"] = "The repair improves the ETL transform, but it still fails some seeded cases."
    elif hidden_result["pass_fraction"] > 0:
        details["reason"] = "The core transform improved, but the runnable script entrypoint still drifts."
    elif main_result.returncode == 0:
        details["reason"] = "The script runs, but it does not yet produce the required normalized records."
    else:
        details["reason"] = "The repair is still incorrect or incomplete."
    return score, details


def _grade_task_3(env: DataOpsEnvironment) -> tuple[float, dict[str, Any]]:
    if env.scenario.task_3 is None:
        return 0.0, {"error": "Task 3 scenario missing."}

    scenario = env.scenario.task_3
    evidence = env.evidence.get("task_3", {})
    expected_rows = list(scenario.expected_rows)
    expected_report = build_task_3_report(expected_rows, scenario.target_date)

    report_data = _load_task_3_data(env.workspace_dir, expected_rows)
    formatter = _run_task_3_formatter(env.workspace_dir, expected_rows, scenario.target_date)
    email = _score_task_3_email(env, expected_report)

    report_exact_and_proven = bool(
        report_data["matches_expected"] and evidence.get("report_data_matches_sql")
    )
    formatter_exact_and_proven = bool(
        formatter["matches_expected"] and evidence.get("format_output_matches_expected")
    )

    components: dict[str, Any] = {
        "sql_provenance": {
            "score": 0.20 if evidence.get("matching_sql_executed") else 0.0,
            "max": 0.20,
            "passed": bool(evidence.get("matching_sql_executed")),
        },
        "report_data": {
            "score": 0.20 if report_exact_and_proven else 0.05 if report_data["matches_expected"] else 0.0,
            "max": 0.20,
            "passed": report_exact_and_proven,
        },
        "formatter": {
            "score": 0.25 if formatter_exact_and_proven else 0.05 if formatter["runs"] else 0.0,
            "max": 0.25,
            "passed": formatter_exact_and_proven,
        },
        "email": {
            "score": email["score"],
            "max": 0.35,
            "passed": email["passed"],
        },
    }
    score = round(sum(component["score"] for component in components.values()), 4)
    details: dict[str, Any] = {
        "target_date": scenario.target_date,
        "expected_recipient": scenario.recipient,
        "expected_subject": scenario.subject,
        "report_data": report_data["details"],
        "formatter": formatter["details"],
        "email": email["details"],
        "evidence": evidence,
        "components": components,
    }

    if score == 1.0:
        details["reason"] = "Perfect - the seeded SQL slice, JSON output, formatter run, and final email all align."
    elif score >= 0.55:
        details["reason"] = "Strong progress - some of the seeded workflow is correct, but provenance is incomplete."
    elif score > 0:
        details["reason"] = "Partial progress - artifacts exist, but the end-to-end incident workflow is not proven."
    else:
        details["reason"] = "The seeded hard task is still unsolved."
    return score, details


def _inspect_task_2_source(source: str) -> dict[str, Any]:
    try:
        tree = ast.parse(source)
    except SyntaxError as exc:
        return {"passed": False, "error": str(exc), "has_function": False}

    functions = [node for node in tree.body if isinstance(node, ast.FunctionDef)]
    target = next((node for node in functions if node.name == "process_data_stream"), None)
    passed = target is not None and len(target.args.args) == 1
    return {"passed": passed, "has_function": target is not None}


def _run_task_2_case_check(
    workspace_dir: str,
    batch: tuple[dict[str, Any], ...],
    expected: tuple[dict[str, Any], ...],
) -> dict[str, Any]:
    wrapper = f"""
import importlib.util
import json

spec = importlib.util.spec_from_file_location("candidate_pipeline", "broken_pipeline.py")
module = importlib.util.module_from_spec(spec)
assert spec.loader is not None
spec.loader.exec_module(module)

batch = {json.dumps(list(batch))}
results = module.process_data_stream(batch)
print("__RESULT__=" + json.dumps(results))
"""
    result = run_python_code(
        wrapper,
        cwd=workspace_dir,
        timeout_s=SCRIPT_TIMEOUT_S,
        stdout_limit=INTERNAL_STDOUT_LIMIT,
        stderr_limit=INTERNAL_STDERR_LIMIT,
    )
    payload = next(
        (
            line[len("__RESULT__=") :]
            for line in result.stdout.splitlines()
            if line.startswith("__RESULT__=")
        ),
        "",
    )
    try:
        parsed = json.loads(payload) if payload else None
    except json.JSONDecodeError:
        parsed = None
    normalised = normalize_task_2_output_rows(parsed)
    ok = result.returncode == 0 and normalised == list(expected)
    return {
        "passed": ok,
        "timed_out": result.timed_out,
        "stdout": result.stdout[:500],
        "stderr": result.stderr[:500],
        "actual": normalised,
    }


def _run_task_2_hidden_tests(
    workspace_dir: str,
    hidden_cases: tuple[tuple[dict[str, Any], ...], ...],
    hidden_expected: tuple[tuple[dict[str, Any], ...], ...],
) -> dict[str, Any]:
    wrapper = f"""
import importlib.util
import json

spec = importlib.util.spec_from_file_location("candidate_pipeline", "broken_pipeline.py")
module = importlib.util.module_from_spec(spec)
assert spec.loader is not None
spec.loader.exec_module(module)

cases = {json.dumps([list(batch) for batch in hidden_cases])}
results = [module.process_data_stream(case) for case in cases]
print("__RESULT__=" + json.dumps(results))
"""
    result = run_python_code(
        wrapper,
        cwd=workspace_dir,
        timeout_s=SCRIPT_TIMEOUT_S,
        stdout_limit=INTERNAL_STDOUT_LIMIT,
        stderr_limit=INTERNAL_STDERR_LIMIT,
    )
    payload = next(
        (
            line[len("__RESULT__=") :]
            for line in result.stdout.splitlines()
            if line.startswith("__RESULT__=")
        ),
        "",
    )
    try:
        parsed = json.loads(payload) if payload else None
    except json.JSONDecodeError:
        parsed = None
    if not isinstance(parsed, list):
        parsed = []

    actual_batches = [
        normalize_task_2_output_rows(batch)
        for batch in parsed
    ]
    expected = [list(batch) for batch in hidden_expected]
    case_passes = [
        actual == expected_case
        for actual, expected_case in zip(actual_batches, expected, strict=False)
    ]
    if len(case_passes) < len(expected):
        case_passes.extend([False] * (len(expected) - len(case_passes)))
    pass_fraction = (
        sum(1 for passed in case_passes if passed) / len(expected)
        if expected
        else 0.0
    )
    return {
        "passed": result.returncode == 0 and len(actual_batches) == len(expected) and all(case_passes),
        "timed_out": result.timed_out,
        "stdout": result.stdout[:500],
        "stderr": result.stderr[:500],
        "actual": actual_batches,
        "case_passes": case_passes,
        "pass_fraction": round(pass_fraction, 4),
    }


def _load_task_3_data(
    workspace_dir: str, expected_rows: list[dict[str, Any]]
) -> dict[str, Any]:
    report_json = os.path.join(workspace_dir, "report_data.json")
    if not os.path.isfile(report_json):
        return {
            "matches_expected": False,
            "details": {"exists": False, "reason": "report_data.json not found."},
        }

    try:
        with open(report_json, encoding="utf-8") as f:
            payload = json.load(f)
    except (OSError, json.JSONDecodeError) as exc:
        return {
            "matches_expected": False,
            "details": {"exists": True, "reason": str(exc)},
        }

    if not isinstance(payload, list):
        return {
            "matches_expected": False,
            "details": {
                "exists": True,
                "reason": "report_data.json must contain a JSON list.",
            },
        }

    rows = normalize_task_3_rows(payload, require_headcount=True)
    matches_expected = bool(rows) and task_3_data_matches_expected(
        rows,
        expected_rows,
        require_headcount=True,
    )
    semantic_fraction = task_3_semantic_match_fraction_rows(rows, expected_rows)
    return {
        "matches_expected": matches_expected,
        "details": {
            "exists": True,
            "rows_valid": bool(rows),
            "rows_match_expected": matches_expected,
            "semantic_fraction": round(semantic_fraction, 4),
        },
    }


def _run_task_3_formatter(
    workspace_dir: str,
    expected_rows: list[dict[str, Any]],
    target_date: str,
) -> dict[str, Any]:
    script = os.path.join(workspace_dir, "format_report.py")
    if not os.path.isfile(script):
        return {
            "runs": False,
            "matches_expected": False,
            "details": {"reason": "format_report.py not found."},
        }

    try:
        result = run_python_script(
            "format_report.py",
            cwd=workspace_dir,
            args=["report_data.json"],
            timeout_s=SCRIPT_TIMEOUT_S,
            stdout_limit=INTERNAL_STDOUT_LIMIT,
            stderr_limit=INTERNAL_STDERR_LIMIT,
        )
    except Exception as exc:
        return {
            "runs": False,
            "matches_expected": False,
            "details": {"reason": str(exc)},
        }
    if result.timed_out:
        return {
            "runs": False,
            "matches_expected": False,
            "details": {"reason": "Formatter timed out."},
        }

    stdout = (result.stdout or "").strip()
    matches_expected = result.returncode == 0 and report_matches_expected(
        stdout,
        expected_rows,
        target_date,
    )
    return {
        "runs": result.returncode == 0,
        "matches_expected": matches_expected,
        "details": {
            "exit_code": result.returncode,
            "stdout": stdout[:500],
            "stderr": (result.stderr or "")[:500],
            "semantic_fraction": round(
                task_3_semantic_match_fraction_text(stdout, expected_rows, target_date),
                4,
            ),
        },
    }


def _score_task_3_email(
    env: DataOpsEnvironment, expected_report: str
) -> dict[str, Any]:
    scenario = env.scenario.task_3
    assert scenario is not None
    evidence = env.evidence.get("task_3", {})
    outbox = env.email_outbox
    if not outbox:
        return {
            "score": 0.0,
            "passed": False,
            "details": {"reason": "No email sent."},
        }

    email = outbox[-1]
    recipient_ok = email.get("to_email") == scenario.recipient
    subject_ok = email.get("subject") == scenario.subject
    body = str(email.get("body", "")).strip()
    body_ok = body == expected_report.strip()
    proven = bool(evidence.get("email_matches_formatter_output")) and len(outbox) == 1

    score = 0.0
    if recipient_ok:
        score += 0.05
    if subject_ok:
        score += 0.05
    if body_ok and proven:
        score += 0.25

    return {
        "score": score,
        "passed": score == 0.35,
        "details": {
            "emails_sent": len(outbox),
            "recipient_ok": recipient_ok,
            "subject_ok": subject_ok,
            "body_ok": body_ok,
            "proven": proven,
            "semantic_fraction": round(
                task_3_semantic_match_fraction_text(
                    body,
                    list(scenario.expected_rows),
                    scenario.target_date,
                ),
                4,
            ),
        },
    }


def _current_transactions_rows(db_path: str) -> list[dict[str, Any]]:
    with sqlite3.connect(db_path) as conn:
        conn.row_factory = sqlite3.Row
        table_exists = conn.execute(
            "SELECT name FROM sqlite_master WHERE type='table' AND name='transactions'"
        ).fetchone()
        if not table_exists:
            return []
        rows = conn.execute(
            "SELECT id, user_id, amount, status FROM transactions ORDER BY id"
        ).fetchall()
    return [
        {
            "id": int(row["id"]),
            "user_id": int(row["user_id"]),
            "amount": None if row["amount"] is None else round(float(row["amount"]), 2),
            "status": str(row["status"]),
        }
        for row in rows
    ]