#!/usr/bin/env python3
"""Fixed-dialogue field deployment wizard for scan calibration."""

from __future__ import annotations

import argparse
from contextlib import redirect_stdout
from datetime import datetime
import io
import json
from pathlib import Path
import re
import subprocess
import sys
import tempfile
import time

import scan_calibrator as core


ROOT = Path(__file__).resolve().parent
CONFIG_PATH = "/smart-cam/config/config.json"
TARGET_OVERLAP = 0.04
RED = "\033[31m"
GREEN = "\033[32m"
YELLOW = "\033[33m"
RESET = "\033[0m"


class Cancelled(Exception):
    pass


def say(message: str = "", *, color: str = "") -> None:
    print(f"{color}{message}{RESET if color else ''}", flush=True)


def choose(question: str, choices: set[str]) -> str:
    while True:
        answer = input(f"\n{question}\n> ").strip()
        if answer == "3":
            raise Cancelled
        if answer in choices:
            return answer
        say(f"请输入 {' / '.join(sorted(choices | {'3'}))}。", color=YELLOW)


def confirm_position(question: str) -> None:
    choose(f"{question}\n到位后回复 1；回复 3 随时退出。", {"1"})


def camera_ptz() -> dict[str, int]:
    ptz = core.get_ptz()
    core.print_ptz(ptz, "已读取")
    return ptz


def remove_session_snapshots(paths: set[str]) -> None:
    for path in sorted(paths):
        if not path.startswith("/smart-cam/data/scan/calibration/"):
            continue
        subprocess.run(
            ["docker", "exec", "smart-cam", "rm", "-f", "--", path],
            stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, check=False,
        )


def candidate_deltas(axis: str) -> list[int]:
    if axis == "pan":
        return [250, 450, 700, 1000, 1400, 1900, 2600]
    return [120, 220, 350, 500, 700, 950, 1300]


def choose_direction(axis: str, origin: dict[str, int], points: dict) -> int:
    if axis == "pan":
        # Pan is circular. The direction changes only the sign, not the FOV estimate.
        return 1
    low = min(int(points["top-left"]["tilt"]), int(points["bottom-right"]["tilt"]))
    high = max(int(points["top-left"]["tilt"]), int(points["bottom-right"]["tilt"]))
    return 1 if high - origin["tilt"] >= origin["tilt"] - low else -1


def estimate_axis(axis: str, origin: dict[str, int], points: dict,
                  snapshots: set[str]) -> dict:
    direction = choose_direction(axis, origin, points)
    baseline = core.snapshot()
    snapshots.add(baseline)
    reliable: list[tuple[float, int, dict]] = []
    say(f"\n正在标定 {axis}_step，摄像头会自动移动并回到起点……")

    for delta in candidate_deltas(axis):
        result = core.measure_delta(
            axis, delta, direction, 1.0, baseline=baseline, origin=origin
        )
        snapshots.add(str(result.get("candidate_file", "")))
        if not result.get("valid"):
            say(f"  step={delta}: 当前图片匹配不足，继续尝试")
            continue
        overlap = float(result["overlap"])
        inliers = int(result.get("inliers") or 0)
        ratio = float(result.get("inlier_ratio") or 0)
        say(f"  step={delta}: 重叠约 {overlap*100:.1f}%，"
            f"有效特征={inliers}，内点率={ratio*100:.1f}%")
        if inliers >= 50 and ratio >= 0.45 and 0.08 <= overlap <= 0.80:
            # Prefer a mid-overlap sample: enough common features without tiny motion.
            reliable.append((abs(overlap - 0.40), delta, result))
        if 0.18 <= overlap <= 0.55 and reliable:
            break

    if not reliable:
        core.move(origin)
        core.fail(
            f"{axis}方向没有得到可靠视场测量。请把摄像头移到远处、纹理丰富、"
            "非重复图案的位置后重新运行向导"
        )

    _, measured_step, detail = min(reliable, key=lambda item: item[0])
    measured_overlap = float(detail["overlap"])
    estimated_fov = measured_step / (1.0 - measured_overlap)
    step = max(1, round(estimated_fov * (1.0 - TARGET_OVERLAP)))
    core.move(origin)
    return {
        "value": step,
        "direction": direction,
        "overlap": TARGET_OVERLAP,
        "target_overlap": TARGET_OVERLAP,
        "overlap_method": "axis_shift_v1_retargeted",
        "zoom": origin["zoom"],
        "measured_at": origin,
        "good_matches": detail.get("good_matches"),
        "inliers": detail.get("inliers"),
        "inlier_ratio": detail.get("inlier_ratio"),
        "derived_from": {
            "value": measured_step,
            "overlap": measured_overlap,
            "estimated_fov": round(estimated_fov, 4),
        },
    }


def calculate_steps(points: dict, snapshots: set[str]) -> None:
    origin = camera_ptz()
    zooms = [int(points[name]["zoom"]) for name in ("top-left", "bottom-right")]
    if max(zooms + [origin["zoom"]]) - min(zooms + [origin["zoom"]]) > 10:
        core.fail("三个位置的zoom不一致；请固定焦段后重新开始")
    state = core.load_state()
    state["steps"]["pan"] = estimate_axis("pan", origin, points, snapshots)
    state["steps"]["tilt"] = estimate_axis("tilt", origin, points, snapshots)
    core.save_state(state)


def generate(mount: str) -> tuple[dict, Path, str]:
    before = set((ROOT / "result").glob("scan_config_*.json"))
    output = io.StringIO()
    with redirect_stdout(output):
        core.command_generate(argparse.Namespace(mount=mount))
    after = set((ROOT / "result").glob("scan_config_*.json"))
    created = sorted(after - before, key=lambda path: path.stat().st_mtime)
    if not created:
        core.fail("没有找到本次生成的配置文件")
    result_file = created[-1]
    scan = json.loads(result_file.read_text(encoding="utf-8"))["scan"]
    return scan, result_file, output.getvalue()


def deploy_config(scan: dict) -> None:
    raw = subprocess.run(
        ["docker", "exec", "smart-cam", "cat", CONFIG_PATH],
        text=True, capture_output=True, check=True,
    ).stdout
    config = json.loads(raw)
    if not isinstance(config.get("scan"), dict):
        raise RuntimeError(f"{CONFIG_PATH}缺少scan对象")

    config["scan"].update(scan)

    with tempfile.NamedTemporaryFile(
        mode="w", encoding="utf-8", suffix=".json", delete=False
    ) as temporary:
        json.dump(config, temporary, ensure_ascii=False, indent=2)
        temporary.write("\n")
        local_temp = Path(temporary.name)
    try:
        subprocess.run(
            ["docker", "cp", str(local_temp), f"smart-cam:{CONFIG_PATH}.new"],
            check=True,
        )
        subprocess.run(
            ["docker", "exec", "smart-cam", "python3", "-m", "json.tool",
             f"{CONFIG_PATH}.new"],
            stdout=subprocess.DEVNULL, check=True,
        )
        subprocess.run(
            ["docker", "exec", "smart-cam", "mv", f"{CONFIG_PATH}.new", CONFIG_PATH],
            check=True,
        )
    finally:
        local_temp.unlink(missing_ok=True)

    subprocess.run(["docker", "restart", "smart-cam"], check=True,
                   stdout=subprocess.DEVNULL)
    deadline = time.monotonic() + 90
    while time.monotonic() < deadline:
        try:
            core.api("GET", "/api/v1/scan/status", timeout=5)
            return
        except (SystemExit, subprocess.SubprocessError):
            time.sleep(2)
    raise RuntimeError("smart-cam重启后90秒内scan HTTP服务未就绪")


def run_test_scan() -> dict:
    core.api("POST", "/api/v1/scan/start", timeout=20)
    say("已启动测试扫描。", color=GREEN)
    say("\n扫图日志：")
    since = datetime.now().astimezone().isoformat(timespec="seconds")
    saved_pattern = re.compile(r"\[scan\]\s+saved\b.*\bprogress=(\d+)/(\d+)\b")
    last_progress: tuple[int, int] | None = None
    process = subprocess.Popen(
        ["docker", "logs", "-f", "--since", since, "smart-cam"],
        stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True,
    )
    try:
        while True:
            line = process.stdout.readline() if process.stdout else ""
            match = saved_pattern.search(line)
            if match:
                progress = (int(match.group(1)), int(match.group(2)))
                if progress != last_progress:
                    say(f"已保存第 {progress[0]}/{progress[1]} 张图")
                    last_progress = progress
            status = core.api("GET", "/api/v1/scan/status", timeout=5).get("scan", {})
            if status.get("state") in {"completed", "failed"}:
                if status.get("state") == "completed":
                    say(
                        f"\n扫描完成，共保存 {status.get('completed', status.get('total', 0))} 张图。"
                        f"\n保存目录：{status.get('output_dir', '')}",
                        color=GREEN,
                    )
                else:
                    say(f"\n扫描失败：{status.get('error') or '未知错误'}", color=RED)
                return status
            if not line:
                time.sleep(1)
    finally:
        process.terminate()
        try:
            process.wait(timeout=3)
        except subprocess.TimeoutExpired:
            process.kill()


def run_panorama(scan_status: dict, mount: str) -> Path:
    scan_dir = str(scan_status.get("output_dir") or "")
    scan_id = str(scan_status.get("scan_id") or "")
    # stitch_scan.py runs on the host. A scan_id resolves beneath
    # /userdata/data/scan, while output_dir reported by the API is the
    # container-side /smart-cam/data/scan path.
    source = scan_id or scan_dir
    if not source:
        raise RuntimeError("扫描状态中没有output_dir或scan_id，无法确定拼图来源")
    stitch = ROOT / "scan-panorama" / "stitch.sh"
    result = subprocess.run(
        [str(stitch), source, "--mount", mount],
        text=True, capture_output=True,
    )
    if result.returncode:
        raise RuntimeError(result.stderr.strip() or result.stdout.strip() or "拼图失败")
    match = re.search(r"^结果：(.+)$", result.stdout, flags=re.MULTILINE)
    if not match:
        raise RuntimeError(f"拼图完成但没有返回结果路径：\n{result.stdout}")
    output = Path(match.group(1).strip())
    if not output.is_file() or output.stat().st_size == 0:
        raise RuntimeError(f"拼图结果不存在或为空：{output}")
    return output


def main() -> None:
    original_state = core.STATE_FILE.read_bytes() if core.STATE_FILE.exists() else None
    snapshots: set[str] = set()
    generated: Path | None = None
    success = False
    try:
        say("您好！我们现在开始配置扫图参数！", color=GREEN)
        say("在接下来的对话中，回复 3 会立即结束，并清理本次向导产生的标定痕迹。")

        stage = choose(
            "① 当前是【野外部署阶段】（回复 1）还是"
            "【办公室测试阶段】（回复 2）？",
            {"1", "2"},
        )
        mount = "hanging" if stage == "1" else "desktop"

        confirm_position(
            "② 请在Web界面中固定本次扫描使用的zoom，"
            "再手动把摄像头移到扫描区域的【左上角】。"
        )
        top_left = camera_ptz()
        state = core.load_state()
        state["points"]["top-left"] = top_left
        core.save_state(state)

        confirm_position(
            "③ 请保持zoom不变，手动把摄像头移到扫描区域的【右下角】。"
        )
        bottom_right = camera_ptz()
        if abs(top_left["zoom"] - bottom_right["zoom"]) > 10:
            core.fail("左右角的zoom不一致，请固定焦段后重新运行")
        state = core.load_state()
        state["points"]["bottom-right"] = bottom_right
        core.save_state(state)

        confirm_position(
            "④ 请保持zoom不变，把摄像头移到扫描区域中央、"
            "距离较远且纹理丰富的位置。\n"
            "请避开纯天空、纯墙面、水面、玻璃和重复图案；"
            "确认后程序会自动移动、拍照并计算step。"
        )
        say("\n正在计算，请不要操作摄像头或Web控制页面……")
        points = core.load_state()["points"]
        calculate_steps(points, snapshots)
        scan, generated, detail = generate(mount)
        say("\n⑤ 本次得到的扫图参数：", color=GREEN)
        say(json.dumps(scan, ensure_ascii=False, indent=2))
        say(detail.strip())

        install = choose(
            "⑥ 是否替换 smart-cam 容器内的"
            "/smart-cam/config/config.json？\n"
            "替换并重启回复 1；不替换并结束回复 3。",
            {"1"},
        )
        if install == "1":
            deploy_config(scan)
            say("替换完成，smart-cam已重启。", color=GREEN)

        test = choose(
            "⑦ 是否现在进行一次完整扫图测试？\n"
            "开始测试回复 1；不测试并结束回复 3。",
            {"1"},
        )
        if test == "1":
            scan_status = run_test_scan()
            if scan_status.get("state") != "completed":
                raise RuntimeError("本次扫描没有成功完成，因此不进入拼图测试")
            stitch = choose(
                "⑧ 本次扫描已完成，是否立即进行拼图测试？\n"
                "开始拼图回复 1；不拼图并结束回复 3。",
                {"1"},
            )
            if stitch == "1":
                panorama = run_panorama(scan_status, mount)
                say(f"\n拼图完成。\n大图存储位置：{panorama}", color=GREEN)
        success = True
        say("\n配置向导已完成，对话结束。", color=GREEN)
    except Cancelled:
        say("\n已结束对话，正在清理本次向导痕迹……", color=YELLOW)
    except (KeyboardInterrupt, EOFError):
        say("\n对话被中断，正在清理本次向导痕迹……", color=YELLOW)
    except Exception as exc:
        say(f"\n向导失败：{exc}", color=RED)
    finally:
        remove_session_snapshots(snapshots)
        if not success:
            if original_state is None:
                core.STATE_FILE.unlink(missing_ok=True)
            else:
                current_state = (
                    core.STATE_FILE.read_bytes() if core.STATE_FILE.exists() else None
                )
                if current_state != original_state:
                    core.STATE_FILE.write_bytes(original_state)
            if generated is not None:
                generated.unlink(missing_ok=True)


if __name__ == "__main__":
    main()