"""Reconstruye un Project desde un archivo .vmsproj (SQLite)."""

from __future__ import annotations

import json
import sqlite3
from datetime import datetime
from pathlib import Path

from vmssailor.core.alarm import Alarm  # noqa: F401  (re-export consistency)
from vmssailor.core.card import Bus, CardInstance, Topology
from vmssailor.core.coords import ShipCoord
from vmssailor.core.enums import (
    AlarmPriority,
    AuthorityRequired,
    BusRole,
    ChannelType,
    ControlMode,
    FilterType,
    Protocol,
    Quality,
    SignalType,
    SystemId,
    UnitSI,
    VesselSubtype,
    VesselType,
)
from vmssailor.core.equipment import Equipment
from vmssailor.core.permissive import Condition, PermissiveRule
from vmssailor.core.persistence.migrations import current_schema_version
from vmssailor.core.project import Project
from vmssailor.core.tag import AlarmConfig, Scaling, Tag, TagBinding
from vmssailor.core.vessel import Bulkhead, Deck, Vessel
from vmssailor.version import VMSPROJ_SCHEMA_VERSION


class VmsProjError(Exception):
    """Error al cargar un .vmsproj."""


def load_project(path: str | Path) -> Project:
    """Reconstruye un `Project` desde un archivo `.vmsproj`.

    Garantiza: `load_project(save_project(p))` produce un Project
    equivalente campo por campo.
    """
    p = Path(path)
    if not p.exists():
        raise VmsProjError(f"Archivo .vmsproj no encontrado: {p}")

    conn = sqlite3.connect(str(p))
    conn.row_factory = sqlite3.Row
    try:
        ver = current_schema_version(conn)
        if ver == 0:
            raise VmsProjError(
                f"Archivo {p} no tiene tabla schema_version — probablemente no es .vmsproj válido."
            )
        if ver > VMSPROJ_SCHEMA_VERSION:
            raise VmsProjError(
                f"Schema version {ver} es más nueva que la soportada por esta versión "
                f"de vmssailor ({VMSPROJ_SCHEMA_VERSION}). Actualizar el código."
            )

        vessel = _read_vessel(conn)
        equipment = _read_equipment(conn)
        topology = _read_topology(conn)
        tags = _read_tags(conn)
        rules = _read_permissive_rules(conn)
        project = _read_project(conn, vessel, equipment, topology, tags, rules)
    finally:
        conn.close()

    return project


# --- Readers internos por tabla --------------------------------------------


def _read_project(
    conn: sqlite3.Connection,
    vessel: Vessel,
    equipment: list[Equipment],
    topology: Topology,
    tags: list[Tag],
    rules: list[PermissiveRule],
) -> Project:
    row = conn.execute(
        """
        SELECT id, name, customer, notes, systems_enabled_json,
               created_at, updated_at, vmssailor_version
        FROM project
        LIMIT 1
        """
    ).fetchone()
    if row is None:
        raise VmsProjError("Tabla 'project' vacía.")

    systems_raw = json.loads(row["systems_enabled_json"])
    systems = [SystemId(s) for s in systems_raw]

    return Project(
        id=row["id"],
        name=row["name"],
        customer=row["customer"] or "",
        notes=row["notes"] or "",
        systems_enabled=systems,
        vessel=vessel,
        equipment=equipment,
        topology=topology,
        tags=tags,
        permissive_rules=rules,
        created_at=datetime.fromisoformat(row["created_at"]),
        updated_at=datetime.fromisoformat(row["updated_at"]),
        vmssailor_version=row["vmssailor_version"],
    )


def _read_vessel(conn: sqlite3.Connection) -> Vessel:
    row = conn.execute(
        """
        SELECT id, name, type, subtype, length_overall_m, beam_max_m, draft_m,
               displacement_kg, silhouette_svg, description, data_source
        FROM vessel
        LIMIT 1
        """
    ).fetchone()
    if row is None:
        raise VmsProjError("Tabla 'vessel' vacía.")

    decks_rows = conn.execute(
        "SELECT id, name, z_bl_bottom, z_bl_top, polygon_xy_json FROM deck "
        "WHERE vessel_id = ? ORDER BY rowid",
        (row["id"],),
    ).fetchall()
    decks = [
        Deck(
            id=d["id"],
            name=d["name"],
            z_bl_bottom=d["z_bl_bottom"],
            z_bl_top=d["z_bl_top"],
            polygon_xy=[tuple(p) for p in json.loads(d["polygon_xy_json"])],
        )
        for d in decks_rows
    ]
    bulks_rows = conn.execute(
        "SELECT id, name, x_pp, description FROM bulkhead WHERE vessel_id = ? ORDER BY rowid",
        (row["id"],),
    ).fetchall()
    bulkheads = [
        Bulkhead(id=b["id"], name=b["name"], x_pp=b["x_pp"], description=b["description"] or "")
        for b in bulks_rows
    ]
    return Vessel(
        id=row["id"],
        name=row["name"],
        type=VesselType(row["type"]),
        subtype=VesselSubtype(row["subtype"]),
        length_overall_m=row["length_overall_m"],
        beam_max_m=row["beam_max_m"],
        draft_m=row["draft_m"],
        displacement_kg=row["displacement_kg"],
        silhouette_svg=row["silhouette_svg"],
        description=row["description"] or "",
        data_source=row["data_source"] or "user_input",
        decks=decks,
        bulkheads=bulkheads,
    )


def _read_equipment(conn: sqlite3.Connection) -> list[Equipment]:
    rows = conn.execute(
        """
        SELECT id, model_ref, tag_prefix, display_name,
               x_pp, y_cl, z_bl, deck_id, system_id, description, installed
        FROM equipment
        ORDER BY rowid
        """
    ).fetchall()
    return [
        Equipment(
            id=r["id"],
            model_ref=r["model_ref"],
            tag_prefix=r["tag_prefix"],
            display_name=r["display_name"],
            location=ShipCoord(x_pp=r["x_pp"], y_cl=r["y_cl"], z_bl=r["z_bl"]),
            deck_id=r["deck_id"],
            system_id=SystemId(r["system_id"]),
            description=r["description"] or "",
            installed=bool(r["installed"]),
        )
        for r in rows
    ]


def _read_topology(conn: sqlite3.Connection) -> Topology:
    bus_rows = conn.execute(
        """
        SELECT id, name, protocol, physical_port, baud_rate, parity, stop_bits,
               termination, description
        FROM bus ORDER BY rowid
        """
    ).fetchall()
    buses = [
        Bus(
            id=b["id"],
            name=b["name"],
            protocol=Protocol(b["protocol"]),
            physical_port=b["physical_port"],
            baud_rate=b["baud_rate"],
            parity=b["parity"],
            stop_bits=b["stop_bits"],
            termination=bool(b["termination"]),
            description=b["description"] or "",
        )
        for b in bus_rows
    ]
    card_rows = conn.execute(
        """
        SELECT id, serial_number, slot_number, bus_id, bus_role, modbus_address,
               physical_location, x_pp, y_cl, z_bl, firmware_version
        FROM card_instance
        ORDER BY rowid
        """
    ).fetchall()
    cards: list[CardInstance] = []
    for r in card_rows:
        loc = None
        if r["x_pp"] is not None and r["y_cl"] is not None and r["z_bl"] is not None:
            loc = ShipCoord(x_pp=r["x_pp"], y_cl=r["y_cl"], z_bl=r["z_bl"])
        cards.append(
            CardInstance(
                id=r["id"],
                serial_number=r["serial_number"] or "",
                slot_number=r["slot_number"],
                bus_id=r["bus_id"],
                bus_role=BusRole(r["bus_role"]),
                modbus_address=r["modbus_address"],
                physical_location=r["physical_location"] or "",
                location=loc,
                firmware_version=r["firmware_version"] or "0.0.0",
            )
        )
    return Topology(buses=buses, cards=cards)


def _read_tags(conn: sqlite3.Connection) -> list[Tag]:
    rows = conn.execute(
        """
        SELECT
            id, equipment_id, description, unit_si,
            range_normal_min, range_normal_max, quality_default,
            controllable, control_mode, authority_required,
            protocol, address, historize, historize_period_s,
            binding_card_id, binding_channel_type, binding_channel_number,
            binding_signal_type, binding_filter, binding_filter_param,
            binding_update_rate_ms,
            binding_scaling_raw_min, binding_scaling_raw_max,
            binding_scaling_eng_min, binding_scaling_eng_max
        FROM tag ORDER BY rowid
        """
    ).fetchall()

    tags: list[Tag] = []
    for r in rows:
        binding = None
        if r["binding_card_id"]:
            scaling = None
            if r["binding_scaling_raw_min"] is not None:
                scaling = Scaling(
                    raw_min=r["binding_scaling_raw_min"],
                    raw_max=r["binding_scaling_raw_max"],
                    eng_min=r["binding_scaling_eng_min"],
                    eng_max=r["binding_scaling_eng_max"],
                )
            binding = TagBinding(
                card_id=r["binding_card_id"],
                channel_type=ChannelType(r["binding_channel_type"]),
                channel_number=r["binding_channel_number"],
                signal_type=SignalType(r["binding_signal_type"]),
                filter=FilterType(r["binding_filter"] or "none"),
                filter_param=r["binding_filter_param"],
                update_rate_ms=r["binding_update_rate_ms"],
                scaling=scaling,
            )
        alarm_rows = conn.execute(
            """
            SELECT id, threshold, operator, priority, hysteresis,
                   delay_seconds, message, escalation_minutes
            FROM alarm_config WHERE tag_id = ? ORDER BY rowid
            """,
            (r["id"],),
        ).fetchall()
        alarms = [
            AlarmConfig(
                id=a["id"],
                threshold=a["threshold"],
                operator=a["operator"],
                priority=AlarmPriority(a["priority"]),
                hysteresis=a["hysteresis"],
                delay_seconds=a["delay_seconds"],
                message=a["message"] or "",
                escalation_minutes=a["escalation_minutes"],
            )
            for a in alarm_rows
        ]
        tags.append(
            Tag(
                id=r["id"],
                equipment_id=r["equipment_id"],
                description=r["description"] or "",
                unit_si=UnitSI(r["unit_si"]),
                range_normal_min=r["range_normal_min"],
                range_normal_max=r["range_normal_max"],
                quality_default=Quality(r["quality_default"]),
                alarms=alarms,
                controllable=bool(r["controllable"]),
                control_mode=ControlMode(r["control_mode"]),
                authority_required=AuthorityRequired(r["authority_required"]),
                protocol=Protocol(r["protocol"]),
                address=r["address"],
                physical_binding=binding,
                historize=bool(r["historize"]),
                historize_period_s=r["historize_period_s"],
            )
        )
    return tags


def _read_permissive_rules(conn: sqlite3.Connection) -> list[PermissiveRule]:
    rows = conn.execute(
        "SELECT id, action_id, description, on_fail_message FROM permissive_rule ORDER BY rowid"
    ).fetchall()
    out: list[PermissiveRule] = []
    for r in rows:
        cond_rows = conn.execute(
            """
            SELECT seq, tag_ref, operator, threshold, threshold_low,
                   threshold_high, severity, message_on_fail
            FROM permissive_condition WHERE rule_id = ? ORDER BY seq
            """,
            (r["id"],),
        ).fetchall()
        conds = [
            Condition(
                tag_ref=c["tag_ref"],
                operator=c["operator"],
                threshold=c["threshold"],
                threshold_low=c["threshold_low"],
                threshold_high=c["threshold_high"],
                severity=c["severity"],
                message_on_fail=c["message_on_fail"] or "",
            )
            for c in cond_rows
        ]
        out.append(
            PermissiveRule(
                id=r["id"],
                action_id=r["action_id"],
                description=r["description"] or "",
                on_fail_message=r["on_fail_message"] or "",
                conditions=conds,
            )
        )
    return out