import os
import httpx
from fastapi import FastAPI, Query
from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles

CH_HOST = os.environ.get("CLICKHOUSE_HOST", "ClickHouse")
CH_PORT = os.environ.get("CLICKHOUSE_PORT", "8123")
CH_USER = os.environ.get("CLICKHOUSE_USER", "default")
# Credentials come from the environment (see .env / docker-compose env_file).
# No secret is kept in source; empty default fails fast if the env is missing.
CH_PASSWORD = os.environ.get("CLICKHOUSE_PASSWORD", "")
CH_URL = f"http://{CH_HOST}:{CH_PORT}/"

app = FastAPI()

CITY_COND = "(length({cities:Array(String)}) = 0 OR city IN {cities:Array(String)})"
DIM_COND = "(length({dimensions:Array(String)}) = 0 OR dimension IN {dimensions:Array(String)})"
BRAND_COND = "(length({brands:Array(String)}) = 0 OR brand IN {brands:Array(String)})"
# manager is Array(String) in pf_board (a task may have several managers), so we
# match with hasAny: keep the row if any selected manager is among its managers.
MANAGER_COND = "(length({managers:Array(String)}) = 0 OR hasAny(manager, {managers:Array(String)}))"
SEARCH_COND = (
    "({search:String} = ''"
    " OR positionCaseInsensitive(address, {search:String}) > 0"
    " OR positionCaseInsensitive(board_id, {search:String}) > 0)"
)
# Independent date bounds: start_date >= X ("Дата начала"), end_date <= Y
# ("Дата окончания"). Each included only when its value is provided.
# NB: the bookings SELECT aliases toString(start_date) AS start_date, which would
# shadow the Date column in WHERE and cause a String-vs-Date type error. Qualify
# with the table name so the comparison always binds to the real Date column.
START_COND = "pf_board.start_date >= {date_start:Date}"
END_COND = "pf_board.end_date <= {date_end:Date}"

# Map endpoint filters board_info (the surface inventory that carries coordinates).
# board_info has no `brand` column, so the brand facet is expressed as "this
# surface has at least one booking of the selected brand" via a subquery on pf_board.
MAP_BRAND_COND = (
    "(length({brands:Array(String)}) = 0"
    " OR board_key IN (SELECT board_key FROM default.pf_board WHERE brand IN {brands:Array(String)}))"
)
# Same idea for the manager facet on the map: keep surfaces that have at least one
# booking managed by one of the selected managers.
MAP_MANAGER_COND = (
    "(length({managers:Array(String)}) = 0"
    " OR board_key IN (SELECT board_key FROM default.pf_board WHERE hasAny(manager, {managers:Array(String)})))"
)


def build_where(city=False, dimension=False, brand=False, manager=False, search=False, date_start=False, date_end=False):
    # Faceted WHERE: include only the requested facet conditions. For the
    # dependent-filter option lists we exclude a facet's own condition so its
    # available values reflect the OTHER filters (all-but-self).
    parts = ["char_length(city) > 0"]
    if city:
        parts.append(CITY_COND)
    if dimension:
        parts.append(DIM_COND)
    if brand:
        parts.append(BRAND_COND)
    if manager:
        parts.append(MANAGER_COND)
    if search:
        parts.append(SEARCH_COND)
    if date_start:
        parts.append(START_COND)
    if date_end:
        parts.append(END_COND)
    return "\n        AND ".join(parts)


async def ch_query(sql: str, params: dict):
    form = {"query": sql, "default_format": "JSONEachRow"}
    for k, v in params.items():
        if isinstance(v, list):
            form[f"param_{k}"] = "[" + ",".join("'" + str(x).replace("'", "\\'") + "'" for x in v) + "]"
        else:
            form[f"param_{k}"] = str(v)
    async with httpx.AsyncClient(timeout=15) as client:
        r = await client.post(CH_URL, params=form, auth=(CH_USER, CH_PASSWORD))
        r.raise_for_status()
        text = r.text.strip()
        if not text:
            return []
        import json
        return [json.loads(line) for line in text.splitlines()]


def parse_filters(city: str, dimension: str, brand: str, manager: str, search: str, date_start: str, date_end: str):
    cities = [c for c in city.split(",") if c] if city else []
    dimensions = [d for d in dimension.split(",") if d] if dimension else []
    brands = [b for b in brand.split(",") if b] if brand else []
    managers = [m for m in manager.split(",") if m] if manager else []
    return {
        "cities": cities,
        "dimensions": dimensions,
        "brands": brands,
        "managers": managers,
        "search": search or "",
        "date_start": date_start or "",
        "date_end": date_end or "",
    }


@app.get("/api/meta")
async def meta(city: str = "", dimension: str = "", brand: str = "", manager: str = "", search: str = "", date_start: str = "", date_end: str = ""):
    params = parse_filters(city, dimension, brand, manager, search, date_start, date_end)
    hds = bool(params["date_start"])
    hde = bool(params["date_end"])
    cities = await ch_query(
        f"SELECT DISTINCT city FROM default.pf_board WHERE {build_where(dimension=True, brand=True, manager=True, search=True, date_start=hds, date_end=hde)} AND char_length(city) > 0 ORDER BY city",
        params,
    )
    brands = await ch_query(
        f"SELECT DISTINCT brand FROM default.pf_board WHERE {build_where(city=True, dimension=True, manager=True, search=True, date_start=hds, date_end=hde)} AND char_length(brand) > 0 ORDER BY brand",
        params,
    )
    dimensions = await ch_query(
        f"SELECT DISTINCT dimension FROM default.pf_board WHERE {build_where(city=True, brand=True, manager=True, search=True, date_start=hds, date_end=hde)} AND char_length(dimension) > 0 ORDER BY dimension",
        params,
    )
    # manager is an Array(String) column — ARRAY JOIN to enumerate distinct names.
    managers = await ch_query(
        f"SELECT DISTINCT m AS manager FROM default.pf_board ARRAY JOIN manager AS m WHERE {build_where(city=True, dimension=True, brand=True, search=True, date_start=hds, date_end=hde)} AND char_length(m) > 0 ORDER BY manager",
        params,
    )
    return {
        "cities": [r["city"] for r in cities],
        "dimensions": [r["dimension"] for r in dimensions],
        "brands": [r["brand"] for r in brands],
        "managers": [r["manager"] for r in managers],
    }


@app.get("/api/boards")
async def boards(city: str = "", dimension: str = "", brand: str = "", manager: str = "", search: str = "", date_start: str = "", date_end: str = ""):
    params = parse_filters(city, dimension, brand, manager, search, date_start, date_end)
    where = build_where(city=True, dimension=True, brand=True, manager=True, search=True, date_start=bool(params["date_start"]), date_end=bool(params["date_end"]))
    sql = f"""
        SELECT
            board_id,
            argMax(address, last_activity) AS board_address,
            argMax(city, last_activity) AS board_city,
            argMax(dimension, last_activity) AS board_dimension
        FROM default.pf_board
        WHERE {where}
        GROUP BY board_id
        ORDER BY board_address
    """
    rows = await ch_query(sql, params)
    return rows


@app.get("/api/bookings")
async def bookings(city: str = "", dimension: str = "", brand: str = "", manager: str = "", search: str = "", date_start: str = "", date_end: str = ""):
    params = parse_filters(city, dimension, brand, manager, search, date_start, date_end)
    where = build_where(city=True, dimension=True, brand=True, manager=True, search=True, date_start=bool(params["date_start"]), date_end=bool(params["date_end"]))
    sql = f"""
        SELECT
            board_id,
            toString(task_id) AS task_id,
            task_status,
            toString(start_date) AS start_date,
            toString(end_date) AS end_date,
            brand,
            company_name
        FROM default.pf_board
        WHERE {where}
        ORDER BY board_id, start_date
    """
    rows = await ch_query(sql, params)
    return rows


@app.get("/api/map")
async def map_data(city: str = "", dimension: str = "", brand: str = "", manager: str = "", search: str = ""):
    # Surfaces come from board_info (has coordinates). Occupancy is computed "as of
    # today" and is intentionally NOT affected by the date-range filters — only the
    # Город/Бренд/Размер/Менеджер/Поиск facets narrow which surfaces are shown.
    params = parse_filters(city, dimension, brand, manager, search, "", "")
    where = " AND ".join([
        "char_length(city) > 0",
        CITY_COND,
        DIM_COND,
        SEARCH_COND,
        MAP_BRAND_COND,
        MAP_MANAGER_COND,
    ])
    surfaces_sql = f"""
        SELECT
            board_key,
            board_id,
            city,
            address,
            dimension,
            board_type,
            side,
            latitude AS lat,
            longitude AS lon
        FROM default.board_info
        WHERE {where}
        ORDER BY city, address
    """
    surfaces = await ch_query(surfaces_sql, params)

    # All bookings active today, keyed by surface, for marker color + balloon.
    current_sql = """
        SELECT
            board_key,
            toString(task_id) AS task_id,
            task_status,
            toString(start_date) AS start_date,
            toString(end_date) AS end_date,
            brand,
            company_name
        FROM default.pf_board
        WHERE board_key != 0
          AND pf_board.start_date <= today()
          AND pf_board.end_date >= today()
    """
    current = await ch_query(current_sql, params)

    by_key: dict = {}
    for b in current:
        by_key.setdefault(b["board_key"], []).append(b)

    out = []
    for s in surfaces:
        active = by_key.get(s["board_key"], [])
        out.append({
            **s,
            "occupied_now": len(active) > 0,
            "bookings": active,
        })
    return out


app.mount("/", StaticFiles(directory="static", html=True), name="static")