"""End-to-end smoke test for the automation harness.

Runs a scripted playthrough: load mission 0, place a rook, take screenshots,
step forward, and validate state at each step. Fails hard on any anomaly.
"""

from __future__ import annotations

import hashlib
import json
import sys
from pathlib import Path

from harness import Harness, HarnessError


def sha256(path: Path) -> str:
    return hashlib.sha256(path.read_bytes()).hexdigest()


def main() -> int:
    with Harness.launch(run_name="smoke") as h:
        print(f"\n[smoke] run dir: {h.root}\n")

        # --- 1. initial state ---
        print("[smoke] load_mission")
        state = h.load_mission("campaign_01", 0)
        assert state["width"] > 0 and state["height"] > 0, state
        assert state["phase"] == "Paused", f"expected Paused, got {state['phase']}"
        assert state["remainingStock"], "stock is empty"
        print(f"  board {state['width']}x{state['height']}, phase={state['phase']}, stock={state['remainingStock']}")

        shot1 = h.screenshot("01_loaded")
        assert shot1.exists(), shot1
        print(f"  screenshot -> {shot1.name}")

        # --- 2. place a piece ---
        snap_before = h.state()
        stock_before = dict(snap_before["remainingStock"])
        first_kind = next(iter(stock_before))
        print(f"[smoke] try placing {first_kind} at (0,0)->(0,0)")

        # Find any legal placement. Simplest: for a Rook-ish piece, same cell start=end
        # isn't legal — try adjacent cells. We scan for one kind we have in stock and a
        # simple legal move.
        placed = None
        for kind in stock_before:
            for s in [(0, 0), (1, 0), (0, 1)]:
                for e in [(0, 1), (1, 1), (2, 0), (0, 2)]:
                    if s == e:
                        continue
                    result = h.place(kind, s, e)
                    if result.get("placed"):
                        placed = (kind, s, e, result)
                        break
                if placed:
                    break
            if placed:
                break

        if not placed:
            print("[smoke] no legal placement found — inspect state dump:")
            print(json.dumps(snap_before, indent=2))
            return 2

        kind, start, end, result = placed
        print(f"  placed {kind} {start}->{end}, pieceId={result.get('pieceId')}")
        h.screenshot("02_placed")

        snap_after = h.state()
        assert len(snap_after["pieces"]) == len(snap_before["pieces"]) + 1, "piece count didn't grow"
        assert snap_after["remainingStock"][kind] == stock_before[kind] - 1, "stock didn't decrement"

        # --- 3. determinism check: two screenshots of a paused state must match ---
        print("[smoke] determinism check")
        a = h.screenshot("det_a")
        b = h.screenshot("det_b")
        if sha256(a) != sha256(b):
            print(f"  WARN: screenshots differ (hover cursor likely) — {sha256(a)[:8]} vs {sha256(b)[:8]}")
        else:
            print("  identical OK")

        # --- 4. stepping ---
        print("[smoke] stepping up to 10 turns")
        for i in range(10):
            step_info = h.step()
            h.screenshot(f"step_{i:02}")
            phase = step_info.get("phase")
            print(f"  turn={step_info.get('turn')} phase={phase}")
            if phase == "MissionComplete":
                print("  mission complete!")
                break

        # --- 5. negative test ---
        print("[smoke] negative test: off-board placement")
        try:
            bad = h.place(kind, (-1, -1), (0, 0))
            assert not bad.get("placed"), f"expected placed:false, got {bad}"
            assert bad.get("reason"), f"expected reason, got {bad}"
            print(f"  rejected with: {bad['reason']}")
        except HarnessError as e:
            print(f"  harness error (acceptable): {e}")

        # --- 6. responsive after negative ---
        print("[smoke] final state dump")
        final = h.state()
        print(f"  phase={final['phase']} turn={final['turn']} pieces={len(final['pieces'])}")

        print("\n[smoke] PASS\n")
        return 0


if __name__ == "__main__":
    sys.exit(main())