"""
EM Embedded - QPU Module

Contains QPU timeseries, caching, filters, and handlers.
"""
import re
import numpy as np
import plotly.graph_objects as go
from collections import defaultdict
from matplotlib import cm as _mpl_cm

from .state import state, ctrl
from .globals import qpu_ts_cache
from .utils import normalized_position_label, format_grid_label

# Import backend functions
try:
    import quantum.utils.delta_impulse_generator as qutils
except ModuleNotFoundError:
    import utils.delta_impulse_generator as qutils

__all__ = [
    "cmap_for_field",
    "update_qpu_position_options",
    "filter_series_keys",
    "refresh_qpu_plot_figures",
    "build_qpu_timeseries_plotly_multi",
    "rebuild_qpu_fig_filtered",
    "rebuild_qpu_fig_others",
    "on_qpu_ts_click",
    "on_qpu_ts_clear",
    "qpu_add_monitor_config",
    "qpu_remove_monitor_config",
    "qpu_set_monitor_field",
    "qpu_set_monitor_points",
    "qpu_set_plot_filter",
    "qpu_set_plot_position_filter",
    "qpu_add_monitor_slot",
    "qpu_remove_monitor_slot",
    # Internal functions needed by handlers
    "hide_qpu_plots",
    "update_qpu_sample_slot",
    "refresh_all_qpu_sample_slots",
]


def hide_qpu_plots():
    """Hide QPU timeseries plots."""
    state.qpu_ts_ready = False
    state.qpu_plot_style = "display: none; width: 900px; height: 660px; margin: 0 auto;"
    state.qpu_ts_other_ready = False
    state.qpu_other_plot_style = "display: none; width: 900px; height: 660px; margin: 0 auto;"
    state.qpu_plot_position_options = ["All positions"]
    state.qpu_plot_position_filter = "All positions"


def update_qpu_sample_slot(slot: int):
    """Update QPU sample slot with grid point info and nearest position message."""
    try:
        suffix = "" if slot == 1 else f"_{slot}"
        samples_var = f"qpu_monitor_samples{suffix}"
        info_var = f"qpu_monitor_sample_info{suffix}"
        gp_var = f"qpu_monitor_gridpoints{suffix}"
        
        samples = getattr(state, samples_var, "")
        
        if not samples or not str(samples).strip():
            setattr(state, info_var, "")
            setattr(state, gp_var, "")
            return
        
        nx_val = state.nx
        if nx_val is None:
            setattr(state, info_var, "Select a grid size (nx) to compute the nearest grid position.")
            setattr(state, gp_var, "")
            return
        
        # Import snap_samples_to_grid to get consistent position formatting
        from .excitation import snap_samples_to_grid
        
        snapped, message = snap_samples_to_grid(samples, int(nx_val))
        setattr(state, gp_var, snapped)
        setattr(state, info_var, message or "")
    except Exception:
        pass


def refresh_all_qpu_sample_slots():
    """Refresh all QPU sample slots."""
    for slot in range(1, 6):
        update_qpu_sample_slot(slot)


def cmap_for_field(field: str):
    """Choose colormap per field (Ez→Reds, Hx→Greens, Hy→Blues)."""
    f = str(field)
    if f == 'Ez':
        return _mpl_cm.Reds
    if f == 'Hx':
        return _mpl_cm.Greens
    return _mpl_cm.Blues


def update_qpu_position_options(current_field: str = "All"):
    """Update QPU position filter options based on current field."""
    try:
        field_key = (current_field or "All").strip() or "All"
        pos_map = qpu_ts_cache.get("positions_by_field") or {}
        entries = pos_map.get(field_key) or pos_map.get("All") or []
        labels = []
        for entry in entries:
            label = None
            if isinstance(entry, dict):
                label = entry.get("label")
                if not label:
                    coords = entry.get("coords") or (None, None)
                    fld = entry.get("field")
                    label = format_grid_label(coords[0], coords[1], fld)
            elif isinstance(entry, (list, tuple)) and len(entry) >= 2:
                lbl_field = entry[2] if len(entry) >= 3 else (field_key if field_key not in ("", "All") else None)
                label = format_grid_label(entry[0], entry[1], lbl_field)
            if label:
                labels.append(label)
        labels = list(dict.fromkeys(labels))
        options = ["All positions"] + labels if labels else ["All positions"]
        state.qpu_plot_position_options = options
        if state.qpu_plot_position_filter not in options:
            state.qpu_plot_position_filter = options[0]
    except Exception:
        pass


def filter_series_keys(series_map, field_filter: str, position_filter: str):
    """Filter series keys based on field and position filters."""
    keys = list(series_map.keys())
    ff = (field_filter or "All").strip()
    pf = (position_filter or "All positions").strip()
    if ff not in ("", "All"):
        keys = [k for k in keys if str(k[0]) == ff]
    if pf not in ("", "All", "All positions"):
        label_map = qpu_ts_cache.get("label_to_keys") or {}
        label_keys = label_map.get(pf)
        if not label_keys:
            return []
        allowed = {(str(fld), int(px), int(py)) for (fld, px, py) in label_keys}
        keys = [k for k in keys if (str(k[0]), int(k[1]), int(k[2])) in allowed]
    return keys


def refresh_qpu_plot_figures():
    """Refresh QPU plot figures with current filter settings."""
    try:
        field_filter = (state.qpu_plot_filter or "All").strip()
    except Exception:
        field_filter = "All"
    try:
        position_filter = (state.qpu_plot_position_filter or "All positions").strip()
    except Exception:
        position_filter = "All positions"

    fig_all = qpu_ts_cache.get("fig")
    times = qpu_ts_cache.get("times") or []
    series_map = qpu_ts_cache.get("series_map") or {}
    if fig_all is None or not times or not series_map:
        return

    update_qpu_position_options(field_filter)
    fig_primary = rebuild_qpu_fig_filtered(field_filter, position_filter)
    if fig_primary is None:
        fig_primary = fig_all

    if fig_primary is not None:
        try:
            ctrl.qpu_ts_update(fig_primary)
        except Exception:
            pass
        state.qpu_ts_ready = True
        state.qpu_plot_style = "width: 900px; height: 660px; margin: 0 auto;"
    else:
        state.qpu_ts_ready = False
        state.qpu_plot_style = "display: none; width: 900px; height: 660px; margin: 0 auto;"

    if field_filter not in ("", "All") and position_filter in ("", "All", "All positions"):
        fig_oth = rebuild_qpu_fig_others(field_filter, position_filter)
        if fig_oth is not None and getattr(fig_oth, "data", None):
            try:
                ctrl.qpu_ts_other_update(fig_oth)
            except Exception:
                pass
            state.qpu_ts_other_ready = True
            state.qpu_other_plot_style = "width: 900px; height: 660px; margin: 0 auto;"
        else:
            state.qpu_ts_other_ready = False
            state.qpu_other_plot_style = "display: none; width: 900px; height: 660px; margin: 0 auto;"
    else:
        state.qpu_ts_other_ready = False
        state.qpu_other_plot_style = "display: none; width: 900px; height: 660px; margin: 0 auto;"


def build_qpu_timeseries_plotly_multi(configs, nx: int, T: float, snapshot_dt: float, impulse_pos, *, series_runner, progress_callback=None, print_callback=None):
    """Build multi-config Plotly time series using the provided series runner."""
    if series_runner is None:
        raise ValueError("series_runner callable is required for QPU timeseries builds.")
    times = qutils.create_time_frames(T, snapshot_dt)
    fig = go.Figure()
    
    all_triplets = []
    cfg_expanded = []
    
    for cfg in (configs or []):
        field_type = (cfg.get("field") or "Ez").strip()
        pts_str = str(cfg.get("points") or "").strip()
        fields = ('Ez', 'Hx', 'Hy') if field_type == 'All' else (field_type,)
        raw_pts = [tuple(map(int, m)) for m in re.findall(r"\((\d+)\s*,\s*(\d+)\)", pts_str)] or [impulse_pos]
        for f in fields:
            if f == 'Ez':
                gw, gh = nx, nx
            elif f == 'Hx':
                gw, gh = nx, nx - 1
            else:
                gw, gh = nx - 1, nx
            valid = []
            for (px, py) in raw_pts:
                if 0 <= px < gw and 0 <= py < gh:
                    valid.append((int(px), int(py)))
            if not valid:
                continue
            cfg_expanded.append((f, valid))
            all_triplets.extend((f, px, py) for (px, py) in valid)
    
    max_sum = max(((px + py) for (_, px, py) in all_triplets), default=1)
    if max_sum <= 0:
        max_sum = 1

    series_map = {}
    positions_by_field = defaultdict(dict)
    key_to_label = {}
    label_to_keys = defaultdict(set)
    max_abs = 0.0
    dashes = ["solid", "dash", "dot", "dashdot"]
    markers = ["circle", "square", "diamond", "triangle-up", "x"]

    total_configs = len(cfg_expanded)
    for idx, (field_type, valid_positions) in enumerate(cfg_expanded):
        def _sub_progress(p):
            if progress_callback:
                base = (idx / total_configs) * 100
                fraction = (1 / total_configs) * 100
                total_p = base + (p / 100.0) * fraction
                progress_callback(total_p)

        try:
            series_map_field = series_runner(
                field_type=field_type,
                positions=valid_positions,
                total_time=float(T),
                snapshot_dt=float(snapshot_dt),
                nx=int(nx),
                impulse_pos=impulse_pos,
                progress_callback=_sub_progress,
                print_callback=print_callback,
            )
        except Exception as e:
            msg = f"QPU error for {field_type} positions {valid_positions}: {e}"
            if print_callback:
                print_callback(msg)
            continue
        
        cmap = cmap_for_field(field_type)
        num_pts = len(valid_positions)
        
        for i, (px, py) in enumerate(valid_positions):
            ys = (series_map_field or {}).get((px, py), [])
            if not ys or len(ys) != len(times):
                continue
            series_map[(field_type, px, py)] = list(ys)
            try:
                max_abs = max(max_abs, max((abs(float(v)) for v in ys)))
            except Exception:
                pass
            
            if num_pts > 1:
                s_index = i / (num_pts - 1)
                s_light = 0.3 + 0.6 * s_index
            else:
                s_light = 0.6
            
            rgba = cmap(s_light)
            color_hex = f"#{int(rgba[0]*255):02x}{int(rgba[1]*255):02x}{int(rgba[2]*255):02x}"
            
            if field_type == 'Ez':
                gw, gh = nx, nx
            elif field_type == 'Hx':
                gw, gh = nx, nx - 1
            else:
                gw, gh = nx - 1, nx
            
            label = normalized_position_label(px, py, gw, gh)
            key = (str(field_type), int(px), int(py))
            key_to_label[key] = label
            label_to_keys[label].add(key)
            positions_by_field[str(field_type)][(int(px), int(py))] = {
                "coords": (int(px), int(py)),
                "label": label,
                "field": str(field_type),
            }
            
            fig.add_trace(
                go.Scatter(
                    x=times,
                    y=ys,
                    mode='lines+markers',
                    name=label,
                    line=dict(color=color_hex, width=2.5, dash=dashes[i % len(dashes)]),
                    marker=dict(size=7, symbol=markers[i % len(markers)], color=color_hex),
                    hovertemplate=f"{field_type} | t=%{{x:.3f}}s<br>Value=%{{y:.6g}}<extra>{label}</extra>",
                )
            )
    
    unique_fields = sorted({f for (f, _, _) in series_map.keys()})
    fig.update_layout(
        title=f"Time Series ({', '.join(unique_fields) if unique_fields else '—'})",
        height=660, width=900,
        margin=dict(l=50, r=30, t=50, b=50),
        hovermode="x unified",
        legend=dict(orientation='h', yanchor='bottom', y=1.02, xanchor='right', x=1, title_text=""),
        paper_bgcolor="#FFFFFF",
        plot_bgcolor="#FFFFFF",
    )
    fig.update_xaxes(title_text="Time (s)", title_font=dict(size=22), tickfont=dict(size=16), showgrid=True, gridcolor="rgba(0,0,0,.06)")
    fig.update_yaxes(title_text="Field Value", title_font=dict(size=22), tickfont=dict(size=16), showgrid=True, gridcolor="rgba(0,0,0,.06)")
    if max_abs > 0:
        pad = 0.12 * max_abs
        fig.update_yaxes(range=[-max_abs - pad, max_abs + pad])

    # Update cache
    qpu_ts_cache["times"] = list(times)
    qpu_ts_cache["series_map"] = series_map
    qpu_ts_cache["field"] = ",".join(unique_fields) if len(unique_fields) == 1 else ("multi" if unique_fields else "")
    qpu_ts_cache["fig"] = fig
    qpu_ts_cache["unique_fields"] = list(unique_fields)
    
    try:
        positions_map_sorted = {}
        all_entries = {}
        for field_name, entry_map in positions_by_field.items():
            entries = [entry_map[key] for key in sorted(entry_map.keys(), key=lambda xy: (xy[0], xy[1]))]
            positions_map_sorted[field_name] = entries
            for entry in entries:
                all_entries.setdefault(entry["label"], entry)
        positions_map_sorted["All"] = sorted(all_entries.values(), key=lambda entry: (entry["coords"][0], entry["coords"][1]))
        qpu_ts_cache["positions_by_field"] = positions_map_sorted
        qpu_ts_cache["key_to_label"] = key_to_label
        qpu_ts_cache["label_to_keys"] = {lbl: sorted(list(vals)) for lbl, vals in label_to_keys.items()}
        qpu_ts_cache["nx"] = int(nx)
    except Exception:
        qpu_ts_cache["positions_by_field"] = {"All": []}
        qpu_ts_cache["key_to_label"] = {}
        qpu_ts_cache["label_to_keys"] = {}
    
    try:
        state.qpu_plot_field_options = ["All"] + list(unique_fields)
        state.qpu_plot_filter = "All"
        update_qpu_position_options("All")
    except Exception:
        pass
    
    return fig


def rebuild_qpu_fig_filtered(filter_value: str, position_filter: str = "All positions"):
    """Rebuild QPU figure with field/position filters applied."""
    try:
        fv = (filter_value or "All").strip()
        pf = (position_filter or "All positions").strip()
        fig_all = qpu_ts_cache.get("fig")
        times = qpu_ts_cache.get("times") or []
        series_map = qpu_ts_cache.get("series_map") or {}
        if fig_all is None or not times or not series_map:
            return fig_all
        
        use_base = fv in ("", "All") and pf in ("", "All", "All positions")
        if use_base:
            return fig_all
        
        keys = filter_series_keys(series_map, fv, pf)
        if not keys:
            return None
        
        fig = go.Figure()
        dashes = ["solid", "dash", "dot", "dashdot"]
        markers = ["circle", "square", "diamond", "triangle-up", "x"]
        max_abs = 0.0
        label_map = qpu_ts_cache.get("key_to_label") or {}
        sorted_keys = sorted(keys, key=lambda x: (str(x[0]), x[1], x[2]))
        num_keys = len(sorted_keys)
        
        for i, k in enumerate(sorted_keys):
            field_name, px, py = k
            ys = series_map.get(k) or []
            if not ys or len(ys) != len(times):
                continue
            try:
                max_abs = max(max_abs, max((abs(float(v)) for v in ys)))
            except Exception:
                pass
            
            cmap = cmap_for_field(field_name)
            if num_keys > 1:
                s_index = i / (num_keys - 1)
                s_light = 0.3 + 0.6 * s_index
            else:
                s_light = 0.6
            
            rgba = cmap(s_light)
            color_hex = f"#{int(rgba[0]*255):02x}{int(rgba[1]*255):02x}{int(rgba[2]*255):02x}"
            label = label_map.get((str(field_name), int(px), int(py))) or format_grid_label(px, py, field_name)
            
            fig.add_trace(go.Scatter(
                x=times,
                y=ys,
                mode='lines+markers',
                name=label,
                line=dict(color=color_hex, width=2.5, dash=dashes[i % len(dashes)]),
                marker=dict(size=7, symbol=markers[i % len(markers)], color=color_hex),
                hovertemplate=f"{field_name} | t=%{{x:.3f}}s<br>Value=%{{y:.6g}}<extra>{label}</extra>",
            ))
        
        title_parts = []
        if fv not in ("", "All"):
            title_parts.append(fv)
        if pf not in ("", "All", "All positions"):
            title_parts.append(pf)
        suffix = " - ".join(title_parts) if title_parts else "Filtered"
        
        fig.update_layout(
            title=f"IBM QPU Time Series ({suffix})",
            height=660, width=900,
            margin=dict(l=50, r=30, t=50, b=50),
            hovermode="x unified",
            legend=dict(orientation='h', yanchor='bottom', y=1.02, xanchor='right', x=1)
        )
        fig.update_xaxes(title_text="Time (s)", title_font=dict(size=22), tickfont=dict(size=16))
        fig.update_yaxes(title_text="Field Value", title_font=dict(size=22), tickfont=dict(size=16))
        if max_abs > 0:
            pad = 0.12 * max_abs
            fig.update_yaxes(range=[-max_abs - pad, max_abs + pad])
        
        return fig
    except Exception:
        return qpu_ts_cache.get("fig")


def rebuild_qpu_fig_others(selected_field: str, position_filter: str = "All positions"):
    """Build Plotly figure for all components except the selected one."""
    try:
        times = qpu_ts_cache.get("times") or []
        series_map = qpu_ts_cache.get("series_map") or {}
        if not times or not series_map:
            return None
        
        all_fields = sorted({str(k[0]) for k in series_map.keys()})
        other_fields = [f for f in all_fields if f != selected_field]
        if not other_fields:
            return None
        
        keys = [k for k in series_map.keys() if str(k[0]) in other_fields]
        if not keys:
            return None
        
        fig = go.Figure()
        dashes = ["solid", "dash", "dot", "dashdot"]
        markers = ["circle", "square", "diamond", "triangle-up", "x"]
        max_abs = 0.0
        label_map = qpu_ts_cache.get("key_to_label") or {}
        sorted_keys = sorted(keys, key=lambda x: (str(x[0]), x[1], x[2]))
        num_keys = len(sorted_keys)
        
        for i, k in enumerate(sorted_keys):
            field_name, px, py = k
            ys = series_map.get(k) or []
            if not ys or len(ys) != len(times):
                continue
            try:
                max_abs = max(max_abs, max((abs(float(v)) for v in ys)))
            except Exception:
                pass
            
            cmap = cmap_for_field(field_name)
            s_light = 0.6 if num_keys == 1 else 0.3 + 0.6 * (i / (num_keys - 1))
            rgba = cmap(s_light)
            color_hex = f"#{int(rgba[0]*255):02x}{int(rgba[1]*255):02x}{int(rgba[2]*255):02x}"
            label = label_map.get((str(field_name), int(px), int(py))) or format_grid_label(px, py, field_name)
            
            fig.add_trace(go.Scatter(
                x=times,
                y=ys,
                mode='lines+markers',
                name=label,
                line=dict(color=color_hex, width=2.5, dash=dashes[i % len(dashes)]),
                marker=dict(size=7, symbol=markers[i % len(markers)], color=color_hex),
                hovertemplate=f"{field_name} | t=%{{x:.3f}}s<br>Value=%{{y:.6g}}<extra>{label}</extra>",
            ))
        
        fig.update_layout(
            title=f"Other Components ({', '.join(other_fields)})",
            height=660, width=900,
            margin=dict(l=50, r=30, t=50, b=50),
            hovermode="x unified",
            legend=dict(orientation='h', yanchor='bottom', y=1.02, xanchor='right', x=1)
        )
        if max_abs > 0:
            pad = 0.12 * max_abs
            fig.update_yaxes(range=[-max_abs - pad, max_abs + pad])
        
        return fig
    except Exception:
        return None


# Click handlers
def on_qpu_ts_click(evt):
    """Handle click on QPU time series plot."""
    try:
        if not evt or "points" not in evt or not evt["points"]:
            return
        x = float(evt["points"][0].get("x"))
        times = qpu_ts_cache.get("times") or []
        fig = qpu_ts_cache.get("fig")
        if not times or fig is None:
            return
        idx = int(np.argmin(np.abs(np.asarray(times) - x)))
        sel_t = float(times[idx])
        fig.update_layout(shapes=[dict(
            type="line", x0=sel_t, x1=sel_t, y0=0, y1=1, 
            xref="x", yref="paper", 
            line=dict(color="#5F259F", width=2, dash="dot")
        )])
        qpu_ts_cache["fig"] = fig
        try:
            ctrl.qpu_ts_update(fig)
        except Exception:
            pass
        state.qpu_ts_selected_time = sel_t
    except Exception:
        pass


def on_qpu_ts_clear():
    """Clear QPU time series selection."""
    try:
        fig = qpu_ts_cache.get("fig")
        if fig is None:
            return
        fig.update_layout(shapes=[])
        qpu_ts_cache["fig"] = fig
        try:
            ctrl.qpu_ts_update(fig)
        except Exception:
            pass
        state.qpu_ts_selected_time = None
    except Exception:
        pass


# Register click handlers on controller
ctrl.on_qpu_ts_click = on_qpu_ts_click
ctrl.on_qpu_ts_clear = on_qpu_ts_clear


# Monitor config management
def qpu_add_monitor_config():
    """Add a new QPU monitor configuration."""
    from .globals import new_monitor_cfg
    configs = list(state.qpu_monitor_configs or [])
    configs.append(new_monitor_cfg())
    state.qpu_monitor_configs = configs


def qpu_remove_monitor_config(index):
    """Remove a QPU monitor configuration by index."""
    configs = list(state.qpu_monitor_configs or [])
    if 0 <= index < len(configs):
        configs.pop(index)
        state.qpu_monitor_configs = configs


def qpu_set_monitor_field(index, value):
    """Set the field for a monitor config."""
    configs = list(state.qpu_monitor_configs or [])
    if 0 <= index < len(configs):
        configs[index]["field"] = value
        state.qpu_monitor_configs = configs


def qpu_set_monitor_points(index, value):
    """Set the points for a monitor config."""
    configs = list(state.qpu_monitor_configs or [])
    if 0 <= index < len(configs):
        configs[index]["points"] = value
        state.qpu_monitor_configs = configs


def qpu_set_plot_filter(value):
    """Set the component filter and refresh chart."""
    state.qpu_plot_filter = value
    update_qpu_position_options(value)
    refresh_qpu_plot_figures()


def qpu_set_plot_position_filter(value):
    """Set the position filter and refresh chart."""
    state.qpu_plot_position_filter = value
    refresh_qpu_plot_figures()


def qpu_add_monitor_slot():
    """Add a new QPU monitor slot."""
    try:
        cnt = int(state.qpu_monitor_count or 0)
    except Exception:
        cnt = 0
    if cnt < 4:
        state.qpu_monitor_count = cnt + 1


def qpu_remove_monitor_slot(slot_index):
    """Remove a QPU monitor slot."""
    try:
        cnt = int(state.qpu_monitor_count or 0)
    except Exception:
        cnt = 0
    if slot_index <= cnt:
        # Shift remaining slots up
        for i in range(slot_index, cnt):
            src = i + 1
            setattr(state, f"qpu_field_components_{i}", getattr(state, f"qpu_field_components_{src}", "Ez"))
            setattr(state, f"qpu_monitor_gridpoints_{i}", getattr(state, f"qpu_monitor_gridpoints_{src}", ""))
            setattr(state, f"qpu_monitor_samples_{i}", getattr(state, f"qpu_monitor_samples_{src}", ""))
            setattr(state, f"qpu_monitor_sample_info_{i}", getattr(state, f"qpu_monitor_sample_info_{src}", ""))
        state.qpu_monitor_count = max(0, cnt - 1)


# Register on controller
ctrl.qpu_remove_monitor_config = qpu_remove_monitor_config
ctrl.qpu_set_monitor_field = qpu_set_monitor_field
ctrl.qpu_set_monitor_points = qpu_set_monitor_points
ctrl.qpu_set_plot_filter = qpu_set_plot_filter
ctrl.qpu_set_plot_position_filter = qpu_set_plot_position_filter
ctrl.qpu_add_monitor_slot = qpu_add_monitor_slot
ctrl.qpu_remove_monitor_slot = qpu_remove_monitor_slot