import os
from pathlib import Path

from flask import Flask, Response, jsonify, request, send_from_directory
from flask_cors import CORS

from db_py import count_tests, del_config, get_all_tests, get_config, set_config
from scanner import full_scan, scan_results_only
from sse_py import broadcast, stream_events
from watcher import start_watching

PORT = int(os.getenv("PORT", "3001"))
ALLOWED_KEYS = {
    "target_dir",
    "results_dir",
    "results_dir_ref",
    "avg_time_coe",
    "avg_time_p2p",
    "avg_time_p3p",
    "smb_username",
    "smb_password",
    "smb_domain",
}

BASE_DIR = Path(__file__).resolve().parent
DIST_DIR = BASE_DIR.parent / "dashboard" / "dist"

app = Flask(__name__, static_folder=str(DIST_DIR), static_url_path="")
CORS(app)


def _apply_smb_env_from_config():
    mapping = {
        "SMB_USERNAME": get_config("smb_username"),
        "SMB_PASSWORD": get_config("smb_password"),
        "SMB_DOMAIN": get_config("smb_domain"),
    }

    for env_key, value in mapping.items():
        if value in (None, ""):
            os.environ.pop(env_key, None)
        else:
            os.environ[env_key] = str(value)


@app.get("/api/tests")
def get_tests_route():
    completed = request.args.get("completed")
    interference = request.args.get("interference")
    throttled = request.args.get("throttled")
    device = request.args.get("device")
    rotation = request.args.get("rotation")
    test_point = request.args.get("testPoint")
    station = request.args.get("station")
    band = request.args.get("band")
    channel = request.args.get("channel")
    bandwidth = request.args.get("bandwidth")
    rssi = request.args.get("rssi")
    direction = request.args.get("direction")

    tests = get_all_tests()

    if completed is not None:
        completed_value = 1 if completed == "true" else 0
        tests = [t for t in tests if t.get("completed") == completed_value]
    if interference:
        tests = [t for t in tests if t.get("interference") == interference]
    if throttled:
        tests = [t for t in tests if t.get("throttled") == throttled]
    if device:
        tests = [t for t in tests if t.get("device") == device]
    if rotation:
        tests = [t for t in tests if t.get("rotation") == rotation]
    if test_point:
        tests = [t for t in tests if t.get("test_point") == test_point]
    if station:
        tests = [t for t in tests if t.get("station") == station]
    if band:
        tests = [t for t in tests if t.get("band") == band]
    if channel:
        tests = [t for t in tests if t.get("channel") == channel]
    if bandwidth:
        tests = [t for t in tests if t.get("bandwidth") == bandwidth]
    if rssi:
        tests = [t for t in tests if t.get("rssi") == rssi]
    if direction:
        tests = [t for t in tests if t.get("direction") == direction]

    tests.sort(key=lambda item: ((item.get("interference") or ""), (item.get("test_id") or "")))
    return jsonify(tests)


@app.get("/api/stats")
def get_stats_route():
    tests = get_all_tests()
    types = ["COE", "P2P", "P3P"]

    total_completed = sum(1 for t in tests if t.get("completed"))
    overall = {
        "total": len(tests),
        "completed": total_completed,
        "completionRate": (total_completed / len(tests)) if tests else 0,
    }

    device_map = {}
    for test in tests:
        name = test.get("device")
        if not name:
            continue

        if name not in device_map:
            device_map[name] = {
                "total": 0,
                "completed": 0,
                "byType": {t: {"total": 0, "completed": 0} for t in types},
            }
        device_map[name]["total"] += 1

        interference = test.get("interference")
        if interference in device_map[name]["byType"]:
            device_map[name]["byType"][interference]["total"] += 1

        if test.get("completed"):
            device_map[name]["completed"] += 1
            if interference in device_map[name]["byType"]:
                device_map[name]["byType"][interference]["completed"] += 1

    devices = []
    for name in sorted(device_map.keys()):
        stats = device_map[name]
        devices.append(
            {
                "name": name,
                "total": stats["total"],
                "completed": stats["completed"],
                "completionRate": (stats["completed"] / stats["total"]) if stats["total"] else 0,
                "byType": stats["byType"],
            }
        )

    elapsed_seconds = 0
    for test in tests:
        duration = test.get("duration_seconds")
        if test.get("completed") and duration is not None:
            elapsed_seconds += duration

    by_type = {}
    estimate_possible = True
    estimated_remaining_seconds = 0

    for test_type in types:
        type_tests = [t for t in tests if t.get("interference") == test_type]
        completed_tests = [t for t in type_tests if t.get("completed")]
        with_duration = [t for t in completed_tests if t.get("duration_seconds") is not None]
        remaining = len(type_tests) - len(completed_tests)

        calc_avg = None
        if with_duration:
            calc_avg = sum(t.get("duration_seconds") for t in with_duration) / len(with_duration)

        manual_value = get_config(f"avg_time_{test_type.lower()}")

        avg_seconds = None
        avg_source = None

        if manual_value is not None:
            avg_seconds = float(manual_value)
            avg_source = "manual_override" if calc_avg is not None else "manual"
        elif calc_avg is not None:
            avg_seconds = calc_avg
            avg_source = "calculated"

        by_type[test_type] = {
            "total": len(type_tests),
            "completed": len(completed_tests),
            "remaining": remaining,
            "avgSeconds": avg_seconds,
            "avgSource": avg_source,
        }

        if remaining > 0:
            if avg_seconds is not None:
                estimated_remaining_seconds += avg_seconds * remaining
            else:
                estimate_possible = False

    return jsonify(
        {
            "overall": overall,
            "devices": devices,
            "timing": {
                "elapsedSeconds": elapsed_seconds,
                "estimatedRemainingSeconds": estimated_remaining_seconds if estimate_possible else None,
                "byType": by_type,
            },
        }
    )


@app.get("/api/config")
def get_config_route():
    config = {}
    for key in ALLOWED_KEYS:
        config[key] = get_config(key)
    return jsonify(config)


@app.post("/api/config")
def set_config_route():
    updates = request.get_json(silent=True)
    if not isinstance(updates, dict):
        return jsonify({"error": "Request body must be a JSON object"}), 400

    dirs_changed = False

    for key, value in updates.items():
        if key not in ALLOWED_KEYS:
            continue

        if value in (None, ""):
            del_config(key)
        else:
            set_config(key, str(value))

        if key in {"target_dir", "results_dir", "results_dir_ref"}:
            dirs_changed = True

    if dirs_changed:
        _apply_smb_env_from_config()
        target_dir = get_config("target_dir")
        results_dir = get_config("results_dir")
        results_dir_ref = get_config("results_dir_ref")
        try:
            full_scan(target_dir, results_dir, results_dir_ref)
            start_watching(target_dir, results_dir)
        except Exception as exc:
            print(f"[config] fullScan error: {exc}")
            return jsonify({"error": f"Scan failed: {exc}"}), 500

        tests = get_all_tests()
        completed = len([t for t in tests if t.get("completed")])
        print(f"[config] Scan complete -> {len(tests)} tests found, {completed} completed")
        broadcast({"type": "update"})
        return jsonify({"ok": True, "testCount": len(tests), "completedCount": completed})

    broadcast({"type": "update"})
    return jsonify({"ok": True, "testCount": None, "completedCount": None})


@app.post("/api/config/rescan")
def rescan_route():
    _apply_smb_env_from_config()
    target_dir = get_config("target_dir")
    results_dir = get_config("results_dir")
    results_dir_ref = get_config("results_dir_ref")
    if not target_dir or not results_dir:
        return jsonify({"error": "Directories not configured"}), 400

    try:
        full_scan(target_dir, results_dir, results_dir_ref)
        start_watching(target_dir, results_dir)
    except Exception as exc:
        print(f"[config] rescan error: {exc}")
        return jsonify({"error": f"Scan failed: {exc}"}), 500

    tests = get_all_tests()
    completed = len([t for t in tests if t.get("completed")])
    print(f"[config] Rescan complete -> {len(tests)} tests, {completed} completed")
    broadcast({"type": "update"})
    return jsonify({"ok": True, "testCount": len(tests), "completedCount": completed})


@app.post("/api/config/rescan-results")
def rescan_results_route():
    _apply_smb_env_from_config()
    results_dir = get_config("results_dir")
    results_dir_ref = get_config("results_dir_ref")
    if not results_dir:
        return jsonify({"error": "Results directory not configured"}), 400

    try:
        scan_results_only(results_dir, results_dir_ref)
    except Exception as exc:
        print(f"[config] rescan-results error: {exc}")
        return jsonify({"error": f"Scan failed: {exc}"}), 500

    tests = get_all_tests()
    completed = len([t for t in tests if t.get("completed")])
    print(f"[config] Results rescan complete -> {len(tests)} tests, {completed} completed")
    broadcast({"type": "update"})
    return jsonify({"ok": True, "testCount": len(tests), "completedCount": completed})


@app.get("/api/browse")
def browse_route():
    def _normalize_request_path(path):
        if not path:
            return path
        p = path.strip()
        if os.name == "nt":
            p = p.replace("/", "\\")
        return p

    def _configured_roots():
        raw = os.getenv("BROWSE_ROOTS", "").strip()
        if not raw:
            return []
        roots = []
        for part in raw.split(";"):
            p = part.strip()
            if not p:
                continue
            abs_p = os.path.abspath(p)
            if os.path.isdir(abs_p):
                roots.append(abs_p)
        return roots

    def _is_within_allowed_roots(path, roots):
        if not roots:
            return True
        normalized = os.path.normcase(os.path.abspath(path))
        for root in roots:
            try:
                if os.path.commonpath([normalized, root]) == root:
                    return True
            except ValueError:
                continue
        return False

    roots = _configured_roots()
    req_path = _normalize_request_path(request.args.get("path"))

    if not req_path:
        if roots:
            dirs = []
            for root in roots:
                display_name = os.path.basename(root.rstrip("/\\")) or root
                dirs.append({"name": display_name, "path": root})
            return jsonify({"path": None, "parent": None, "dirs": dirs})

        if os.name == "nt":
            dirs = []
            for drive_idx in range(65, 91):
                drive = f"{chr(drive_idx)}:\\"
                if os.path.exists(drive):
                    dirs.append({"name": drive, "path": drive})
        else:
            dirs = [{"name": "/", "path": "/"}]

        return jsonify({"path": None, "parent": None, "dirs": dirs})

    if not os.path.exists(req_path):
        return jsonify({"error": "Path does not exist"}), 400
    if not os.path.isdir(req_path):
        return jsonify({"error": "Path is not a directory"}), 400
    if not _is_within_allowed_roots(req_path, roots):
        return jsonify({"error": "Path is outside allowed browse roots"}), 403

    try:
        dirs = []
        for name in os.listdir(req_path):
            child = os.path.join(req_path, name)
            if os.path.isdir(child) and not name.startswith("."):
                dirs.append({"name": name, "path": child})

        dirs.sort(key=lambda item: item["name"].lower())
    except OSError:
        return jsonify({"error": "Cannot read directory"}), 403

    parent = os.path.dirname(req_path)
    at_root = os.path.normcase(parent) == os.path.normcase(req_path)
    if roots and parent and not _is_within_allowed_roots(parent, roots):
        parent = None
    return jsonify({"path": req_path, "parent": None if at_root else parent, "dirs": dirs})


@app.get("/api/events")
def events_route():
    headers = {
        "Cache-Control": "no-cache",
        "Connection": "keep-alive",
        "X-Accel-Buffering": "no",
    }
    return Response(stream_events(), mimetype="text/event-stream", headers=headers)


@app.get("/")
@app.get("/<path:path>")
def static_or_spa(path=""):
    if not DIST_DIR.exists():
        return jsonify({"error": "Frontend dist not found"}), 404

    if path and (DIST_DIR / path).is_file():
        return send_from_directory(DIST_DIR, path)
    return send_from_directory(DIST_DIR, "index.html")


def bootstrap():
    _apply_smb_env_from_config()
    target_dir = get_config("target_dir")
    results_dir = get_config("results_dir")
    results_dir_ref = get_config("results_dir_ref")

    if target_dir and results_dir:
        existing = count_tests()
        if existing > 0:
            print(f"[server] Resuming from DB -> {existing} tests already loaded.")
        else:
            print("[server] No cached data, scanning directories...")
            full_scan(target_dir, results_dir, results_dir_ref)
            tests = get_all_tests()
            completed = len([t for t in tests if t.get("completed")])
            print(f"[server] Scan complete -> {len(tests)} tests found, {completed} completed")

        start_watching(target_dir, results_dir)
        print("[server] Watching for changes.")
    else:
        print("[server] No directories configured -> open the dashboard settings to get started.")


if __name__ == "__main__":
    bootstrap()
    print(f"[server] Listening on http://0.0.0.0:{PORT}")
    app.run(host="0.0.0.0", port=PORT, threaded=True)