"""
Module 5: Timeline Builder
============================
Builds integrated investigation timelines from all evidence sources.
"""

import pandas as pd
import numpy as np
from typing import Dict, List, Any
import plotly.graph_objects as go
import plotly.express as px


class TimelineBuilder:
    """Builds integrated forensic investigation timelines."""

    CATEGORY_COLORS = {
        "Physical Evidence": "#f85149",
        "Digital Evidence": "#79c0ff",
        "TOD Window": "#ffa657",
        "Witness/Report": "#56d364",
        "Analysis": "#d2a8ff",
        "Unknown": "#8b949e",
    }

    def build(self, state: Dict) -> Dict[str, Any]:
        events = self._collect_events(state)
        if not events:
            return {"timeline_plot": self._empty_plot(), "timeline_table": pd.DataFrame(),
                    "summary_markdown": "## ⚠️ No timeline events available"}

        events_df = self._build_df(events)
        timeline_plot = self._build_plot(events_df)
        summary = self._build_summary(events_df)
        return {"timeline_plot": timeline_plot, "timeline_table": events_df, "summary_markdown": summary}

    def _collect_events(self, state):
        events = []
        for ev in state.get("timeline_events", []):
            if isinstance(ev, dict):
                events.append({
                    "event": ev.get("event", "Unknown"),
                    "category": ev.get("category", "Unknown"),
                    "source": ev.get("source", "Unknown"),
                    "timestamp": ev.get("timestamp", ""),
                })

        tod = state.get("tod_estimate", {})
        if tod and tod.get("estimated_pmi_hours"):
            events.append({
                "event": f"Estimated TOD (PMI: {tod['estimated_pmi_hours']}h)",
                "category": "TOD Window", "source": "Henssge Model",
                "timestamp": f"~{tod['estimated_pmi_hours']}h before discovery",
            })

        if state.get("risk_score"):
            events.append({
                "event": f"Risk Score: {state['risk_score']:.0f}/100",
                "category": "Analysis", "source": "Risk Engine",
                "timestamp": "Assessment",
            })
        return events

    def _build_df(self, events):
        df = pd.DataFrame(events)
        df["sort_key"] = 0
        for idx, row in df.iterrows():
            try:
                parsed = pd.to_datetime(row["timestamp"])
                df.at[idx, "sort_key"] = parsed.timestamp()
            except:
                df.at[idx, "sort_key"] = 9999999999 + idx
        df = df.sort_values("sort_key").reset_index(drop=True)
        df = df.drop(columns=["sort_key"])
        df.insert(0, "#", range(1, len(df) + 1))
        return df

    def _build_plot(self, df):
        fig = go.Figure()
        parseable = []
        for _, row in df.iterrows():
            try:
                ts = pd.to_datetime(row["timestamp"])
                parseable.append({**row.to_dict(), "parsed_time": ts})
            except:
                pass

        if parseable:
            pe_df = pd.DataFrame(parseable)
            for category in pe_df["category"].unique():
                cat_ev = pe_df[pe_df["category"] == category]
                color = self.CATEGORY_COLORS.get(category, "#8b949e")
                fig.add_trace(go.Scatter(
                    x=cat_ev["parsed_time"], y=[category] * len(cat_ev),
                    mode="markers+text", name=category,
                    marker=dict(size=14, color=color, symbol="diamond"),
                    text=cat_ev["event"].str[:35],
                    textposition="top center", textfont=dict(size=8, color=color),
                ))
        else:
            for idx, row in df.iterrows():
                cat = row.get("category", "Unknown")
                color = self.CATEGORY_COLORS.get(cat, "#8b949e")
                fig.add_trace(go.Scatter(
                    x=[idx], y=[cat], mode="markers", showlegend=False,
                    marker=dict(size=14, color=color, symbol="diamond"),
                    hovertemplate=f"<b>{row.get('event', '')}</b><extra></extra>",
                ))

        fig.update_layout(
            title="🔬 Integrated Forensic Timeline",
            template="plotly_dark", paper_bgcolor="#0d1117", plot_bgcolor="#161b22",
            font=dict(color="#e6edf3"), height=450, showlegend=True,
        )
        fig.update_xaxes(gridcolor="#30363d")
        fig.update_yaxes(gridcolor="#30363d")
        return fig

    def _build_summary(self, df):
        md = "## 📅 Timeline Summary\n\n"
        md += f"**Total Events:** {len(df)}\n\n"
        if "category" in df.columns:
            md += "### Distribution\n| Category | Count |\n|----------|-------|\n"
            for cat, cnt in df["category"].value_counts().items():
                md += f"| {cat} | {cnt} |\n"
            md += "\n"
        md += "### Event Sequence\n\n"
        for _, row in df.iterrows():
            md += f"{row['#']}. **[{row.get('category', '')}]** {row.get('event', '')} "
            md += f"*(Source: {row.get('source', '')})* — `{row.get('timestamp', '')}`\n"
        md += "\n---\n*Timeline ordered by timestamp where parseable.*\n"
        return md

    def _empty_plot(self):
        fig = go.Figure()
        fig.add_annotation(text="No timeline data yet.", xref="paper", yref="paper",
                          x=0.5, y=0.5, showarrow=False, font=dict(size=16, color="#8b949e"))
        fig.update_layout(template="plotly_dark", paper_bgcolor="#0d1117",
                         plot_bgcolor="#161b22", height=400)
        return fig