import json
from datetime import date, datetime
from typing import Any, Iterable

SCRAPE_JOB_TYPES = ("banestatus", "medlemskap", "greenfee", "vtg")
SCRAPE_JOB_STATUSES = ("pending", "running", "completed", "failed")
DEFAULT_MAX_ATTEMPTS = 3
DEFAULT_RECENT_EVENTS_LIMIT = 12


def normalize_facility_ids(facility_ids: Iterable[int]) -> list[int]:
    cleaned = {
        int(facility_id)
        for facility_id in facility_ids
        if str(facility_id).strip()
    }
    return sorted(facility_id for facility_id in cleaned if facility_id > 0)


def _normalize_int_list(values: Iterable[Any]) -> list[int]:
    cleaned: set[int] = set()
    for value in values:
        try:
            cleaned.add(int(value))
        except (TypeError, ValueError):
            continue
    return sorted(item for item in cleaned if item > 0)


def _parse_json(value: Any, fallback: Any) -> Any:
    if value is None:
        return fallback
    if isinstance(value, str):
        try:
            return json.loads(value)
        except json.JSONDecodeError:
            return fallback
    return value


def _normalize_progress_event(value: Any) -> dict[str, Any] | None:
    parsed = _parse_json(value, None)
    if not isinstance(parsed, dict):
        return None

    return {
        "timestamp": str(parsed.get("timestamp") or ""),
        "facility_id": int(parsed["facility_id"]) if str(parsed.get("facility_id") or "").strip().isdigit() else None,
        "facility_name": str(parsed.get("facility_name") or ""),
        "outcome": str(parsed.get("outcome") or "info"),
        "message": str(parsed.get("message") or ""),
        "processed": int(parsed.get("processed") or 0),
        "total": int(parsed.get("total") or 0),
    }


def format_scrape_job_row(row: Any) -> dict[str, Any] | None:
    if row is None:
        return None

    data = dict(row)

    for key in ("created_at", "started_at", "finished_at", "updated_at", "last_heartbeat_at", "next_retry_at", "last_error_at"):
        if isinstance(data.get(key), (date, datetime)):
            data[key] = data[key].isoformat()

    facility_ids = _parse_json(data.get("facility_ids"), [])
    data["facility_ids"] = facility_ids if isinstance(facility_ids, list) else []

    result_summary = _parse_json(data.get("result_summary"), {})
    data["result_summary"] = result_summary if isinstance(result_summary, dict) else {}
    overlapping_facility_ids = _parse_json(data.get("overlapping_facility_ids"), [])
    data["overlapping_facility_ids"] = _normalize_int_list(overlapping_facility_ids if isinstance(overlapping_facility_ids, list) else [])
    recent_events = _parse_json(data.get("recent_events"), [])
    if isinstance(recent_events, list):
        data["recent_events"] = [event for event in (_normalize_progress_event(item) for item in recent_events) if event]
    else:
        data["recent_events"] = []
    data["progress_total"] = int(data.get("progress_total") or 0)
    data["progress_completed"] = int(data.get("progress_completed") or 0)
    data["progress_ok"] = int(data.get("progress_ok") or 0)
    data["progress_failed"] = int(data.get("progress_failed") or 0)
    data["progress_skipped"] = int(data.get("progress_skipped") or 0)
    data["current_facility_id"] = int(data["current_facility_id"]) if str(data.get("current_facility_id") or "").strip().isdigit() else None
    data["current_facility_name"] = str(data.get("current_facility_name") or "")
    data["retryable"] = bool(data.get("retryable", False))
    data["attempt_count"] = int(data.get("attempt_count") or 0)
    data["max_attempts"] = int(data.get("max_attempts") or DEFAULT_MAX_ATTEMPTS)

    return data


def classify_scrape_error(exc: Exception) -> tuple[str, bool]:
    message = str(exc).lower()
    type_name = type(exc).__name__.lower()
    module_name = type(exc).__module__.lower()

    if "json" in type_name or "jsondecodeerror" in type_name or "expecting value" in message:
        return "json_parse", False
    if "gemini_api_key" in message or "api_key" in message or "mangler i .env" in message:
        return "configuration", False
    if "permission denied" in message or "not found" in message and "module" in message:
        return "configuration", False
    if "timeout" in message or "timed out" in message or "timeouterror" in type_name:
        return "timeout", True
    if "playwright" in module_name or "browser" in message or "page.goto" in message:
        return "browser", True
    if "connection" in message or "connectionreseterror" in type_name or "dns" in message or "network" in message:
        return "network", True
    if "asyncpg" in module_name or "postgres" in message or "database" in message:
        return "database", True
    if "valueerror" in type_name:
        return "validation", False
    return "unknown", False


def compute_retry_delay_seconds(attempt_count: int, error_code: str) -> int:
    base_delay = {
        "timeout": 30,
        "network": 45,
        "browser": 60,
        "database": 30,
        "unknown": 90,
    }.get(error_code, 0)
    if base_delay <= 0:
        return 0
    return min(300, base_delay * max(1, attempt_count))


async def ensure_scrape_jobs_table(conn) -> None:
    await conn.execute(
        """
        CREATE TABLE IF NOT EXISTS scrape_jobs (
            id SERIAL PRIMARY KEY,
            job_type VARCHAR(50) NOT NULL CHECK (job_type IN ('banestatus', 'medlemskap', 'greenfee', 'vtg')),
            facility_ids JSONB NOT NULL DEFAULT '[]'::jsonb,
            total_facilities INTEGER NOT NULL DEFAULT 0,
            status VARCHAR(20) NOT NULL DEFAULT 'pending' CHECK (status IN ('pending', 'running', 'completed', 'failed')),
            requested_by TEXT,
            worker_name TEXT,
            attempt_count INTEGER NOT NULL DEFAULT 0,
            max_attempts INTEGER NOT NULL DEFAULT 3,
            error_message TEXT,
            error_code TEXT,
            retryable BOOLEAN NOT NULL DEFAULT FALSE,
            result_summary JSONB NOT NULL DEFAULT '{}'::jsonb,
            recent_events JSONB NOT NULL DEFAULT '[]'::jsonb,
            progress_total INTEGER NOT NULL DEFAULT 0,
            progress_completed INTEGER NOT NULL DEFAULT 0,
            progress_ok INTEGER NOT NULL DEFAULT 0,
            progress_failed INTEGER NOT NULL DEFAULT 0,
            progress_skipped INTEGER NOT NULL DEFAULT 0,
            current_facility_id INTEGER,
            current_facility_name TEXT,
            created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
            started_at TIMESTAMPTZ,
            finished_at TIMESTAMPTZ,
            updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
            last_heartbeat_at TIMESTAMPTZ,
            next_retry_at TIMESTAMPTZ,
            last_error_at TIMESTAMPTZ
        )
        """
    )
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS max_attempts INTEGER NOT NULL DEFAULT 3")
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS error_code TEXT")
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS retryable BOOLEAN NOT NULL DEFAULT FALSE")
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS recent_events JSONB NOT NULL DEFAULT '[]'::jsonb")
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS progress_total INTEGER NOT NULL DEFAULT 0")
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS progress_completed INTEGER NOT NULL DEFAULT 0")
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS progress_ok INTEGER NOT NULL DEFAULT 0")
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS progress_failed INTEGER NOT NULL DEFAULT 0")
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS progress_skipped INTEGER NOT NULL DEFAULT 0")
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS current_facility_id INTEGER")
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS current_facility_name TEXT")
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS next_retry_at TIMESTAMPTZ")
    await conn.execute("ALTER TABLE scrape_jobs ADD COLUMN IF NOT EXISTS last_error_at TIMESTAMPTZ")
    await conn.execute(
        """
        CREATE INDEX IF NOT EXISTS idx_scrape_jobs_status_created_at
        ON scrape_jobs (status, created_at)
        """
    )
    await conn.execute(
        """
        CREATE INDEX IF NOT EXISTS idx_scrape_jobs_job_type_created_at
        ON scrape_jobs (job_type, created_at DESC)
        """
    )
    await conn.execute(
        """
        CREATE INDEX IF NOT EXISTS idx_scrape_jobs_status_next_retry_at
        ON scrape_jobs (status, next_retry_at)
        """
    )


async def _find_active_job_conflict(conn, job_type: str, normalized_ids: list[int]) -> tuple[dict[str, Any] | None, str | None]:
    if not normalized_ids:
        return None, None

    requested_set = set(normalized_ids)
    rows = await conn.fetch(
        """
        SELECT *
        FROM scrape_jobs
        WHERE job_type = $1
          AND status IN ('pending', 'running')
        ORDER BY created_at DESC
        """,
        job_type,
    )

    partial_conflict: dict[str, Any] | None = None
    for row in rows:
        formatted = format_scrape_job_row(row)
        if not formatted:
            continue
        existing_ids = normalize_facility_ids(formatted.get("facility_ids", []))
        overlap = sorted(requested_set.intersection(existing_ids))
        if not overlap:
            continue

        formatted["overlapping_facility_ids"] = overlap
        if existing_ids == normalized_ids:
            return formatted, "already_queued"
        if partial_conflict is None:
            partial_conflict = formatted

    if partial_conflict:
        return partial_conflict, "conflict"
    return None, None


async def enqueue_scrape_job(pool, job_type: str, facility_ids: Iterable[int], requested_by: str | None = None) -> tuple[dict[str, Any], str]:
    if job_type not in SCRAPE_JOB_TYPES:
        raise ValueError(f"Ugyldig job_type: {job_type}")

    normalized_ids = normalize_facility_ids(facility_ids)
    facility_ids_json = json.dumps(normalized_ids)

    async with pool.acquire() as conn:
        async with conn.transaction():
            existing_job, queue_status = await _find_active_job_conflict(conn, job_type, normalized_ids)
            if existing_job and queue_status:
                return existing_job, queue_status

            row = await conn.fetchrow(
                """
                INSERT INTO scrape_jobs (
                    job_type,
                    facility_ids,
                    total_facilities,
                    requested_by
                )
                VALUES ($1, $2::jsonb, $3, $4)
                RETURNING *
                """,
                job_type,
                facility_ids_json,
                len(normalized_ids),
                requested_by,
            )
            return format_scrape_job_row(row), "queued"


async def list_scrape_jobs(pool, job_type: str | None = None, limit: int = 10) -> list[dict[str, Any]]:
    safe_limit = max(1, min(limit, 50))

    async with pool.acquire() as conn:
        if job_type:
            rows = await conn.fetch(
                """
                SELECT *
                FROM scrape_jobs
                WHERE job_type = $1
                ORDER BY created_at DESC
                LIMIT $2
                """,
                job_type,
                safe_limit,
            )
        else:
            rows = await conn.fetch(
                """
                SELECT *
                FROM scrape_jobs
                ORDER BY created_at DESC
                LIMIT $1
                """,
                safe_limit,
            )
    return [format_scrape_job_row(row) for row in rows]


async def claim_next_scrape_job(pool, worker_name: str, stale_heartbeat_seconds: int = 120) -> dict[str, Any] | None:
    async with pool.acquire() as conn:
        async with conn.transaction():
            await conn.execute(
                """
                UPDATE scrape_jobs
                SET status = 'pending',
                    worker_name = NULL,
                    updated_at = NOW(),
                    retryable = TRUE,
                    error_code = COALESCE(error_code, 'worker_stale'),
                    error_message = COALESCE(error_message, 'Forrige worker mistet heartbeat før jobben ble ferdig.'),
                    last_error_at = NOW(),
                    next_retry_at = NOW() + INTERVAL '15 seconds'
                WHERE status = 'running'
                  AND attempt_count < max_attempts
                  AND last_heartbeat_at IS NOT NULL
                  AND last_heartbeat_at < NOW() - ($1 * INTERVAL '1 second')
                """,
                stale_heartbeat_seconds,
            )
            await conn.execute(
                """
                UPDATE scrape_jobs
                SET status = 'failed',
                    worker_name = NULL,
                    updated_at = NOW(),
                    finished_at = NOW(),
                    retryable = FALSE,
                    error_code = COALESCE(error_code, 'worker_stale'),
                    error_message = COALESCE(error_message, 'Forrige worker mistet heartbeat og maks forsok er oppbrukt.'),
                    last_error_at = NOW(),
                    next_retry_at = NULL
                WHERE status = 'running'
                  AND attempt_count >= max_attempts
                  AND last_heartbeat_at IS NOT NULL
                  AND last_heartbeat_at < NOW() - ($1 * INTERVAL '1 second')
                """,
                stale_heartbeat_seconds,
            )
            row = await conn.fetchrow(
                """
                WITH next_job AS (
                    SELECT id
                    FROM scrape_jobs
                    WHERE status = 'pending'
                      AND COALESCE(next_retry_at, created_at) <= NOW()
                    ORDER BY created_at ASC
                    FOR UPDATE SKIP LOCKED
                    LIMIT 1
                )
                UPDATE scrape_jobs AS job
                SET status = 'running',
                    worker_name = $1,
                    attempt_count = job.attempt_count + 1,
                    started_at = COALESCE(job.started_at, NOW()),
                    updated_at = NOW(),
                    last_heartbeat_at = NOW(),
                    error_message = NULL,
                    progress_completed = 0,
                    progress_ok = 0,
                    progress_failed = 0,
                    progress_skipped = 0,
                    current_facility_id = NULL,
                    current_facility_name = NULL,
                    recent_events = '[]'::jsonb,
                    next_retry_at = NULL
                FROM next_job
                WHERE job.id = next_job.id
                RETURNING job.*
                """,
                worker_name,
            )
    return format_scrape_job_row(row)


async def heartbeat_scrape_job(pool, job_id: int) -> None:
    async with pool.acquire() as conn:
        await conn.execute(
            """
            UPDATE scrape_jobs
            SET last_heartbeat_at = NOW(),
                updated_at = NOW()
            WHERE id = $1
            """,
            job_id,
        )


async def complete_scrape_job(pool, job_id: int, result_summary: dict[str, Any] | None = None) -> None:
    payload = json.dumps(result_summary or {})
    async with pool.acquire() as conn:
        await conn.execute(
            """
            UPDATE scrape_jobs
            SET status = 'completed',
                finished_at = NOW(),
                updated_at = NOW(),
                last_heartbeat_at = NOW(),
                error_message = NULL,
                error_code = NULL,
                retryable = FALSE,
                current_facility_id = NULL,
                current_facility_name = NULL,
                next_retry_at = NULL,
                result_summary = $2::jsonb
            WHERE id = $1
            """,
            job_id,
            payload,
        )


async def fail_scrape_job(
    pool,
    job_id: int,
    error_message: str,
    result_summary: dict[str, Any] | None = None,
    *,
    error_code: str = "unknown",
    retryable: bool = False,
    retry_delay_seconds: int = 0,
) -> dict[str, Any] | None:
    payload = json.dumps(result_summary or {})
    async with pool.acquire() as conn:
        row = await conn.fetchrow(
            """
            UPDATE scrape_jobs
            SET status = CASE
                    WHEN $4 AND attempt_count < max_attempts THEN 'pending'
                    ELSE 'failed'
                END,
                finished_at = CASE
                    WHEN $4 AND attempt_count < max_attempts THEN NULL
                    ELSE NOW()
                END,
                updated_at = NOW(),
                last_heartbeat_at = NOW(),
                error_message = $2,
                error_code = $3,
                retryable = $4,
                result_summary = $5::jsonb,
                last_error_at = NOW(),
                current_facility_id = NULL,
                current_facility_name = NULL,
                worker_name = CASE
                    WHEN $4 AND attempt_count < max_attempts THEN NULL
                    ELSE worker_name
                END,
                next_retry_at = CASE
                    WHEN $4 AND attempt_count < max_attempts THEN NOW() + ($6 * INTERVAL '1 second')
                    ELSE NULL
                END
            WHERE id = $1
            RETURNING *
            """,
            job_id,
            error_message[:1000],
            error_code,
            retryable,
            payload,
            max(0, retry_delay_seconds),
        )
    return format_scrape_job_row(row)


async def update_scrape_job_progress(
    pool,
    job_id: int,
    *,
    progress_total: int | None = None,
    progress_completed: int | None = None,
    progress_ok: int | None = None,
    progress_failed: int | None = None,
    progress_skipped: int | None = None,
    current_facility_id: int | None = None,
    current_facility_name: str | None = None,
    event: dict[str, Any] | None = None,
    clear_current: bool = False,
) -> dict[str, Any] | None:
    async with pool.acquire() as conn:
        row = await conn.fetchrow("SELECT * FROM scrape_jobs WHERE id = $1", job_id)
        current = format_scrape_job_row(row)
        if not current:
            return None

        events = list(current.get("recent_events") or [])
        normalized_event = _normalize_progress_event(event) if event else None
        if normalized_event:
            normalized_event["timestamp"] = datetime.now().astimezone().isoformat()
            events.append(normalized_event)
            events = events[-DEFAULT_RECENT_EVENTS_LIMIT:]

        next_current_facility_id = current.get("current_facility_id")
        next_current_facility_name = current.get("current_facility_name") or ""
        if clear_current:
            next_current_facility_id = None
            next_current_facility_name = ""
        else:
            if current_facility_id is not None:
                next_current_facility_id = current_facility_id
            if current_facility_name is not None:
                next_current_facility_name = current_facility_name

        updated_row = await conn.fetchrow(
            """
            UPDATE scrape_jobs
            SET progress_total = $2,
                progress_completed = $3,
                progress_ok = $4,
                progress_failed = $5,
                progress_skipped = $6,
                current_facility_id = $7,
                current_facility_name = $8,
                recent_events = $9::jsonb,
                updated_at = NOW()
            WHERE id = $1
            RETURNING *
            """,
            job_id,
            progress_total if progress_total is not None else current.get("progress_total", 0),
            progress_completed if progress_completed is not None else current.get("progress_completed", 0),
            progress_ok if progress_ok is not None else current.get("progress_ok", 0),
            progress_failed if progress_failed is not None else current.get("progress_failed", 0),
            progress_skipped if progress_skipped is not None else current.get("progress_skipped", 0),
            next_current_facility_id,
            next_current_facility_name,
            json.dumps(events),
        )
    return format_scrape_job_row(updated_row)