"""proteus.cli.commands.replay — the ``replay`` subcommand (print a saved trace)."""

from __future__ import annotations

import argparse
import sys

from proteus.game.runtime import read_traces


def _cmd_replay(args: argparse.Namespace) -> int:
    try:
        traces = read_traces(args.trace_file)
    except FileNotFoundError:
        print(f"trace file not found: {args.trace_file}", file=sys.stderr)
        return 2
    if not traces:
        print(f"no traces in {args.trace_file}", file=sys.stderr)
        return 1

    if args.visual or args.png:
        from proteus.game.viz import reconstruct, render_terminal, write_pngs

        for trace in traces:
            steps = reconstruct(trace)
            if args.visual:
                render_terminal(steps, fps=args.fps)
            if args.png:
                paths = write_pngs(steps, args.png)
                print(f"wrote {len(paths)} PNG frames to {args.png}")
        return 0

    for trace in traces:
        print(
            f"=== {trace.scenario} seed={trace.seed} {trace.difficulty} "
            f"model={trace.model} -> {trace.outcome} ==="
        )
        for turn in trace.turns:
            tag = "congruent" if turn.was_congruent else "DIVERGED"
            diag = " [diagnostic]" if turn.is_diagnostic else ""
            print(
                f"  turn {turn.turn_idx}: action={turn.action} "
                f"motive={turn.motive_action} habit={turn.habit_action} "
                f"{tag}{diag} reward={turn.reward}"
            )
        print(f"  metrics: {trace.metrics}")
    return 0