tail-fin-591 0.7.8

use serde::{Deserialize, Deserializer, Serialize};

/// 591 returns some "really an integer" fields as either a JSON
/// integer or a JSON string depending on the listing. This helper
/// accepts both forms and lands on `u32`. Used for `SaleHouseListing::
/// photo_num` (string `"11"` or int `19` in the wild).
fn u32_string_or_int<'de, D: Deserializer<'de>>(d: D) -> Result<u32, D::Error> {
    let v = serde_json::Value::deserialize(d)?;
    match v {
        serde_json::Value::String(s) => s.parse().map_err(serde::de::Error::custom),
        serde_json::Value::Number(n) => n
            .as_u64()
            .and_then(|n| u32::try_from(n).ok())
            .ok_or_else(|| serde::de::Error::custom(format!("u32 out of range: {n}"))),
        other => Err(serde::de::Error::custom(format!(
            "expected string or integer for u32, got {other:?}"
        ))),
    }
}

/// A hot community listing (from `/api/community/rentHot`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Community {
    pub id: String,
    pub name: String,
}

/// Detailed info for a community (from `/api/community/detail`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CommunityDetail {
    pub id: u64,
    pub name: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub region: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub section: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub address: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub age: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub floor: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub house_holds: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub lat: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub lng: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub build_purpose: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub base_area: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub const_company: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub search_count: Option<String>,
}

/// A nearby community (from `/api/community/nearby`).
///
/// 591 returns up to ~5 communities geographically close to the queried
/// `id`, each with sale-side stats (`min_price`, `sale_num`) and a
/// distance string. Distinct from [`Community`] (which is just
/// `{id, name}` from the rent-hot list) and [`CommunityDetail`] (which
/// is the full info page for a single community).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NearbyCommunity {
    pub id: u64,
    pub name: String,
    /// Numeric region id (1 = Taipei, etc.). See `REGIONS`.
    pub region_id: u32,
    /// Numeric section id (district within a region).
    pub section_id: u32,
    /// Display region (e.g. `"台北市"`).
    pub region: String,
    /// Display section (e.g. `"信義區"`).
    pub section: String,
    /// Average sale price per ping (e.g. `{ price: "150.66", unit: "萬/坪" }`).
    pub price_unit: PriceValue,
    pub address: String,
    pub full_address: String,
    /// Age string, e.g. `"5年屋齡"`. Empty for buildings 591 hasn't
    /// dated.
    pub age: String,
    /// Total household count, e.g. `"282戶"`. May be empty.
    pub house_holds: String,
    /// `"住宅"` / `"華廈"` / `"商用"` etc.
    pub build_purpose: String,
    /// Distance from the queried community, e.g. `"距離126公尺"`.
    pub distance: String,
    /// Number of for-sale listings currently on this community.
    pub sale_num: u32,
    /// Minimum sale price among `sale_num` listings, in 萬元 (10,000 NTD).
    /// Typically `0` when `sale_num == 0` (the live test asserts the
    /// forward direction `sale_num > 0 ⇒ min_price > 0`; the reverse
    /// is documented but not empirically verified across all cases).
    pub min_price: u64,
}

/// A single transaction price record (from community detail `price.items`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PriceRecord {
    pub id: u64,
    /// ROC date string, e.g. "115-01-20"
    pub date: String,
    pub address: String,
    pub layout: String,
    pub build_area: String,
    pub total_price: String,
    pub unit_price: PriceValue,
    pub shift_floor: String,
    pub total_floor: String,
    pub build_purpose_str: String,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PriceValue {
    pub price: String,
    pub unit: String,
}

/// A sale listing near a community (from community detail `sale.rooms[].items[]`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SaleListing {
    pub houseid: u64,
    pub title: String,
    pub price_v: PriceValue,
    pub price_unit: String,
    pub room: String,
    pub address: String,
    pub area_v: AreaValue,
    pub floor: String,
    pub floor_en: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub photo_src: Option<String>,
    pub label: Vec<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AreaValue {
    pub area: String,
    pub unit: String,
}

/// A rental listing from `bff-house.591.com.tw/v3/web/rent/list` (pure HTTP).
///
/// Wire fields are mapped via `From<RentListItem>`. `price` is the
/// formatted display string (`"17,500"`, with comma); `area` carries
/// the unit suffix (`"9坪"`); `post_time` is a Chinese relative-time
/// string (`"7小時內更新"`), not an ISO date.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SearchListing {
    pub post_id: u64,
    pub title: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub price: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub price_unit: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub address: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub area: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub kind_name: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub room: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub floor: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub photo_list: Option<Vec<String>>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub tags: Option<Vec<String>>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub post_time: Option<String>,
}

/// Parameters for the rental search.
#[derive(Debug, Clone, Default)]
pub struct SearchParams {
    /// Region ID (1 = Taipei City). See `REGIONS` for full list.
    pub region_id: u32,
    /// House kind: 0=all, 1=整層住家, 2=獨立套房, 3=分租套房, 8=雅房, 24=車位
    pub kind: Option<u32>,
    /// Maximum monthly rent (NTD)
    pub price_max: Option<u32>,
    /// Minimum monthly rent (NTD)
    pub price_min: Option<u32>,
    /// Sort field: "posttime" (default) or "price"
    pub order: Option<String>,
    /// Max results to return (per page)
    pub limit: usize,
    /// Pagination offset (0, 30, 60, …). Used by `crawl` to walk through pages.
    pub first_row: usize,
}

/// Options controlling the pagination behaviour of [`crate::Client591::rent_crawl`].
#[derive(Debug, Clone)]
pub struct CrawlOptions {
    /// Maximum pages to fetch. 0 = no limit.
    pub max_pages: usize,
    /// Milliseconds to wait between pages.
    pub delay_ms: u64,
    /// Retry attempts per page on failure (with 2s fixed backoff between retries).
    pub retries: u32,
    /// Starting page index (for resume). 0 = start from beginning.
    pub start_page: usize,
}

impl Default for CrawlOptions {
    fn default() -> Self {
        Self {
            max_pages: 0,
            delay_ms: 1000,
            retries: 3,
            start_page: 0,
        }
    }
}

/// A region with its ID and name.
#[derive(Debug, Clone, Serialize)]
pub struct Region {
    pub id: u32,
    pub name: &'static str,
}

// ---------------------------------------------------------------------------
// BFF endpoints — sale_list / newhouse_list / community_rank
// ---------------------------------------------------------------------------

/// A single sale listing from `bff-house.591/v1/web/sale/list`.
///
/// 591's BFF response carries 60+ fields per listing; this type
/// surfaces the user-facing subset (identity / location / price /
/// area / display strings) and skips ad/internal flags.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SaleHouseListing {
    pub houseid: u64,
    pub title: String,
    pub address: String,
    /// Area in 坪 (Taiwanese unit, ~3.3 m²).
    pub area: f64,
    /// Total sale price in 萬元 (10,000 NTD).
    pub price: u64,
    /// Pre-formatted price string (e.g. `"1,798"`).
    pub showprice: String,
    /// Per-坪 price (e.g. `"119.71萬/坪"`).
    pub unit_price: String,
    /// Floor / total floors (e.g. `"5F/12F"`).
    pub floor: String,
    /// Room / 廳 / 衛 layout (e.g. `"2房1廳1衛"`).
    pub room: String,
    /// `"住宅"` / `"華廈"` / `"商用"` / etc.
    pub kind_name: String,
    /// `"電梯大樓"` / `"公寓"` / etc.
    pub shape_name: String,
    pub region_id: u32,
    pub region_name: String,
    pub section_id: u32,
    pub section_name: String,
    /// Numeric age in years.
    pub houseage: u32,
    /// Human-readable age (`"1年"`).
    pub showhouseage: String,
    /// Unix seconds.
    pub posttime: i64,
    /// View count.
    pub browsenum: u64,
    pub photo_url: String,
    /// Number of photos for the listing. JSON key `"photoNum"`. 591
    /// returns this as **either** a JSON string (`"11"`) or a raw
    /// integer (`19`); we accept both forms via `u32_string_or_int`.
    #[serde(rename = "photoNum", deserialize_with = "u32_string_or_int")]
    pub photo_num: u32,
    /// Owner's display name (`"屋主金小姐"`).
    pub nick_name: String,
    /// Listing tags (often empty).
    #[serde(default)]
    pub tag: Vec<String>,
    /// Community/building name. Falls back to `"依現場名稱"` placeholder
    /// for owner-direct listings without a registered community.
    pub community_name: String,
    /// 591 community detail link (empty when no registered community).
    #[serde(default)]
    pub community_link: String,
    /// Number of for-sale listings on this community. 591 omits this
    /// field entirely for owner-direct listings without a registered
    /// community — `#[serde(default)]` lands those at 0.
    #[serde(default)]
    pub community_sale_num: u32,
    /// "Last refreshed" indicator. 591 returns this as **either**:
    /// - a Chinese relative-time string (`"2小時前"`, `"剛剛"`), or
    /// - a Unix timestamp integer (`1777397463`)
    ///
    /// depending on the listing's age class. Exposed as raw
    /// `serde_json::Value` so callers can match on the discriminant
    /// rather than fight a custom deserializer. For "when was this
    /// posted, full stop" use the stable `posttime` field.
    pub refreshtime: serde_json::Value,
}

/// One page of sale listings from `/v1/web/sale/list`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SaleHousePage {
    /// Total matching listings across all pages.
    pub total: u32,
    /// 0-indexed first row of this page.
    pub first_row: usize,
    pub houses: Vec<SaleHouseListing>,
}

/// A single new-construction project from `bff-newhouse.591/v1/list-search`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseProject {
    /// 建案 ID — 591's "house" id for newhouse projects.
    pub hid: u64,
    /// Linked community ID (the post-handover community in the
    /// rent / sale catalog), if 591 has a record.
    pub community_id: u64,
    /// 建案名稱.
    pub build_name: String,
    /// Full address (`"台北市松山區八德路三段201號"`).
    pub address: String,
    /// Area range string (`"20~26坪"`).
    pub area: String,
    /// Room layout summary (`"二房(20、26坪)"`).
    pub room: String,
    /// Price string — usually a single number (e.g. `"138"`); 591
    /// formats this without a thousands separator for newhouse.
    pub price: String,
    /// Unit suffix — typically `"萬/坪"`.
    pub price_unit: String,
    /// `"住商用"` / `"住宅"` / etc.
    pub purpose_str: String,
    pub region: String,
    #[serde(rename = "regionid")]
    pub region_id: u32,
    pub section: String,
    #[serde(rename = "sectionid")]
    pub section_id: u32,
    /// Nearest landmark / 商圈 (`"台北小巨蛋生活圈"`).
    pub shop_name: String,
    /// Cover photo URL.
    pub cover: String,
    /// Sales-office phone.
    pub phone: String,
    pub phone_ext: String,
    /// Marketing tags (`["近捷運", "明星學區", "近公園", "低首付"]`).
    #[serde(default)]
    pub tag: Vec<String>,
    /// `"2026-04-28"`.
    pub updatetime: String,
    /// Whether the project has a video tour.
    pub is_video: u8,
    /// Visibility tier text (`"區域VIP"` / etc); empty for non-paid.
    pub group_type_txt: String,
}

/// One page of newhouse projects from `/v1/list-search`.
///
/// Constructed from a wire response that mixes empty placeholder slots
/// (single-key objects from 591's ad-injection layer) into the items
/// array. The adapter filters those out — `items` here only contains
/// successfully-parsed `NewhouseProject` entries.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhousePage {
    /// Total projects matching the filter.
    pub total: u32,
    /// Currently-online projects.
    pub online_total: u32,
    /// 1-indexed page number.
    pub page: u32,
    pub per_page: u32,
    pub total_page: u32,
    pub items: Vec<NewhouseProject>,
}

/// 591's `photo_src` shape — appears across rank / various BFF
/// endpoints as an object with the actual URL inside.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PhotoSrc {
    /// Image URL.
    pub src: String,
    /// 591-internal type discriminant.
    #[serde(default, rename = "type")]
    pub kind: u32,
}

/// One entry in a community-rank slot. Used for both `price_data`
/// (price-ranked) and `sale_data` (sale-activity-ranked) buckets.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CommunityRankItem {
    pub cid: u64,
    pub name: String,
    pub address: String,
    /// Cover photo (object form: `{src, type}`).
    pub photo_src: PhotoSrc,
    /// Average per-坪 price.
    pub price: PriceValue,
    /// Numeric metric used for the ranking — depends on slot:
    /// in `price_data` this is the priced-by metric (some kind of
    /// listings-volume figure); in `sale_data` it tracks paid-rank
    /// activity. Value as observed: `1059` for the top entry.
    pub price_num: u64,
    /// Number of for-sale listings in this community.
    pub sale_num: u32,
    /// Nearest landmark / station / 商圈.
    pub shop_name: String,
}

/// Community ranks for a region from `/v1/community/community-rank`.
///
/// 591 returns two parallel rankings of the same shape: `price_data`
/// (top 10 by price-related metric) and `sale_data` (top 10 by sale
/// activity). Both share the same `time` snapshot date.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CommunityRanks {
    pub price_data: Vec<CommunityRankItem>,
    pub sale_data: Vec<CommunityRankItem>,
    /// Snapshot date (`"2026-04-29"`).
    pub time: String,
}

// ---------------------------------------------------------------------------
// /v3/web/rent/list — pure-HTTP rent search (used by Client591::rent_search)
// ---------------------------------------------------------------------------

/// Top-level wrapper for `bff-house.591.com.tw/v3/web/rent/list`.
///
/// `status` is a JSON integer (`1` for success), `total` is a JSON
/// string (`"3728"`) — verified live 2026-04-30. The wire `firstRow`
/// field is intentionally not modeled because 591 echoes 0 even on
/// later pages; the caller tracks its own offset.
#[derive(Debug, Clone, Deserialize)]
pub(crate) struct RentListResponse {
    pub status: i32,
    pub data: Option<RentListData>,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct RentListData {
    /// Total matching listings. 591 currently sends this as a JSON
    /// string (`"3728"`), but `u32_string_or_int_default` accepts the
    /// int form too — forward-compat for a server-side type flip and
    /// loud-fail on garbage strings (rather than the old silent zero).
    #[serde(default, deserialize_with = "u32_string_or_int_default")]
    pub total: u32,
    pub items: Vec<RentListItem>,
}

/// A single rental listing as returned by `/v3/web/rent/list`.
///
/// Wire shape — fields are mapped to the public [`SearchListing`]
/// via `From<RentListItem>`. Most secondary fields (browse_count,
/// surrounding, fitment_name, etc.) are dropped intentionally —
/// they're not part of `SearchListing`'s public contract.
#[derive(Debug, Clone, Deserialize)]
pub(crate) struct RentListItem {
    pub id: u64,
    pub title: String,
    /// Display price (e.g. `"17,500"` — note the comma).
    #[serde(default)]
    pub price: Option<String>,
    /// Price unit (`"元/月"`).
    #[serde(default)]
    pub price_unit: Option<String>,
    #[serde(default)]
    pub address: Option<String>,
    /// Area display string (`"9坪"`). Numeric `area` is present
    /// too but we keep the existing `SearchListing.area: String`
    /// contract for compatibility.
    #[serde(default)]
    pub area_name: Option<String>,
    #[serde(default)]
    pub kind_name: Option<String>,
    /// Layout string. Often empty for 套房 (`""`); populated
    /// for whole-floor rentals (`"2房1廳"`).
    #[serde(default, rename = "layoutStr")]
    pub layout_str: Option<String>,
    #[serde(default)]
    pub floor_name: Option<String>,
    #[serde(default, rename = "photoList")]
    pub photo_list: Option<Vec<String>>,
    #[serde(default)]
    pub tags: Option<Vec<String>>,
    /// Relative-time string ("7小時內更新", "剛剛更新"). Used
    /// as the closest analog to `SearchListing.post_time`.
    #[serde(default)]
    pub refresh_time: Option<String>,
}

impl From<RentListItem> for SearchListing {
    fn from(v: RentListItem) -> Self {
        // Empty strings / empty Vecs collapse to None to match the
        // semantics the existing parse_listing helper used and the
        // `#[serde(skip_serializing_if = "Option::is_none")]` output
        // contract on SearchListing.
        let room = v.layout_str.filter(|s| !s.is_empty());
        let photo_list = v.photo_list.filter(|v| !v.is_empty());
        let tags = v.tags.filter(|v| !v.is_empty());
        SearchListing {
            post_id: v.id,
            title: v.title,
            price: v.price,
            price_unit: v.price_unit,
            address: v.address,
            area: v.area_name,
            kind_name: v.kind_name,
            room,
            floor: v.floor_name,
            photo_list,
            tags,
            post_time: v.refresh_time,
        }
    }
}

// ---------------------------------------------------------------------------
// Newhouse detail family (bff-newhouse.591.com.tw/v1/detail/*, /v1/price/list)
// ---------------------------------------------------------------------------

/// A pending-aware monetary or numeric field. 591 wraps "value or
/// TBD" data in this shape: when `pending: 1`, `price` carries the
/// placeholder string `"待定"` (TBD) and `unit` is empty; when
/// `pending: 0`, both fields carry real values.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PendingPrice {
    pub pending: u8,
    pub price: String,
    pub unit: String,
}

/// Like [`PendingPrice`] but for area ranges. The wire shape adds
/// `area_min` for the lower bound when `pending: 0`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PendingArea {
    pub pending: u8,
    /// Range string (e.g. `"16~59"`).
    pub area: String,
    /// Lower-bound value (e.g. `"16.00"`). Empty/absent when pending.
    #[serde(default)]
    pub area_min: String,
    pub unit: String,
}

/// Like [`PendingPrice`] but the value field is named `layout`
/// (e.g. `"2/3/4"` for a project offering 2-, 3-, and 4-room units).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PendingRoom {
    pub pending: u8,
    pub layout: String,
    pub unit: String,
}

/// Newhouse handover-date metadata.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DealTime {
    /// `"finished"` (project complete) or `"unfinished"` (still selling).
    #[serde(rename = "type")]
    pub kind: String,
    /// Display string (e.g. `"2030年下半年"`).
    pub date: String,
    /// Sales-progress flag.
    pub deal: u8,
}

/// Newhouse project detail (curated subset of `/v1/detail/base-info`'s
/// `data.housing` block — the wire shape carries 80+ fields, this
/// surfaces the ~25 most useful for project-shopping workflows).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseHousing {
    /// 591 housing/project ID. Same value as the URL `id`/`hid` param.
    pub hid: u64,
    pub build_name: String,
    pub address: String,
    /// Display region (e.g. `"台北市"`).
    #[serde(default)]
    pub region: Option<String>,
    pub regionid: u32,
    /// Display section (e.g. `"中山區"`).
    #[serde(default)]
    pub section: Option<String>,
    pub sectionid: u32,
    /// Linked community ID once the project is delivered (0 until then).
    /// 591 sometimes serializes this as `null` for unlinked pre-sales —
    /// the deserializer collapses null/missing/string forms to 0.
    #[serde(default, deserialize_with = "u64_string_or_int_default")]
    pub community_id: u64,
    /// `"預售屋"` (pre-sale), `"新成屋"` (new), `"中古屋"` (resale).
    pub build_type_name: String,
    /// `"住宅大樓"`, `"住商混合"`, etc.
    pub purpose_name: String,
    pub price: PendingPrice,
    pub area: PendingArea,
    /// Project's offered room layouts (e.g. `"2/3/4"`).
    pub layout: PendingRoom,
    /// Free-form description (`"1幢，1棟，118戶住家"`).
    pub households: String,
    /// Per-坪/月 management fee.
    pub manage_cost: PendingPrice,
    /// Cover image URL.
    pub cover: String,
    /// Nearest landmark / 商圈 (`"南京復興生活圈"`).
    pub shop_name: String,
    /// Marketing tags (`["近捷運", "低公設", "景觀宅"]`).
    #[serde(default)]
    pub tag: Vec<String>,
    /// `YYYYMM` integer (e.g. `202510`). 0 for unset / null on the wire.
    #[serde(default, deserialize_with = "u32_string_or_int_default")]
    pub open_sell_time: u32,
    pub deal_time: DealTime,
    /// Construction company.
    pub build_company: String,
    /// Sales agency.
    pub sell_company: String,
    /// `"SRC鋼骨鋼筋混凝土結構"` etc.
    pub structural_engine: String,
    /// `"地上18層，地下4層"`.
    pub floor: String,
    /// `"毛胚屋、標準配備"` etc.
    pub decorate: String,
    /// Parking ratio (`"1:1.03"`).
    pub park_ratio: String,
    /// Pre-construction license (建照).
    pub license: String,
    /// Use license / occupancy permit (使照).
    pub use_license: String,
    /// All-time browse count.
    pub browsenum: u64,
    /// Favourite count.
    pub fav_num: u64,
}

/// One market-data row — either a per-room average (`name: "2房均價"`)
/// or a project-wide aggregate (`name: "成交均價"`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseMarketRoom {
    /// Display label (`"成交均價"`, `"2房均價"`, …).
    pub name: String,
    /// Average per-坪 price as a string (e.g. `"149.1"`, in 萬/坪).
    /// Empty when the project has no transactions yet.
    pub price: String,
}

/// One actual-transaction record from the project's market history.
/// 591 surfaces the most recent N transactions on the project page;
/// older rows can be paginated via the price-list endpoint.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseMarketItem {
    pub id: u64,
    /// ISO date (`"2026-03-10"`).
    pub trans_date: String,
    /// ROC year-month (`"115-03"`).
    pub month: String,
    /// Layout (`"2房2廳"`, `"3房2廳"`).
    pub layout_v2: String,
    pub build_area_v: AreaValue,
    pub building_area: AreaValue,
    pub unit_price: PriceValue,
    /// Total transaction price (e.g. `"3,968"` in 萬元 — comma-separated).
    pub total_price_v: String,
    pub shift_floor: String,
}

/// Project market block — average prices + recent transactions.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseMarket {
    pub housing_id: u64,
    pub housing_name: String,
    /// Linked community ID once delivered (0 / null until then).
    #[serde(default, deserialize_with = "u64_string_or_int_default")]
    pub community_id: u64,
    /// Per-room average prices (and project-wide aggregate).
    #[serde(default)]
    pub rooms: Vec<NewhouseMarketRoom>,
    /// Recent transactions (most-recent first).
    #[serde(default)]
    pub items: Vec<NewhouseMarketItem>,
    /// Total number of transactions on record (across all pages).
    #[serde(default, deserialize_with = "u64_string_or_int_default")]
    pub total: u64,
    /// MM/DD of the last 591-side data refresh (`"04/21"`).
    #[serde(default)]
    pub update_date: String,
}

/// Floor-plan block. Empty for projects that haven't published plans.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseLayoutBlock {
    /// Total number of floor plans available.
    #[serde(default, deserialize_with = "u64_string_or_int_default")]
    pub total: u64,
    /// Raw items (kept as `Value` because the wire shape is sparse on
    /// our pinned test project — typing it would be guesswork).
    #[serde(default)]
    pub items: Vec<serde_json::Value>,
    #[serde(default)]
    pub room_group: Vec<serde_json::Value>,
}

/// Single listed sales agent for a newhouse project.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseSalesAgent {
    pub user_id: u64,
    /// Display name (often the project name itself, sometimes an
    /// individual rep).
    pub realname: String,
    pub mobile_v2: String,
    #[serde(default)]
    pub email: String,
    #[serde(default)]
    pub introduction: String,
    pub avatar: String,
    /// Marketing-side tags (`["17人諮詢"]`, etc.).
    #[serde(default)]
    pub tags: Vec<String>,
}

/// Aggregate of `/v1/detail/module-info` data — the curated subset
/// across `layout` / `market` / `sales`. `news` and `report` are
/// dropped (mostly empty across the projects we sampled).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseModules {
    pub layout: NewhouseLayoutBlock,
    pub market: Option<NewhouseMarket>,
    /// Listed sales agents.
    pub sales_agents: Vec<NewhouseSalesAgent>,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct NewhouseModuleInfoResponse {
    pub status: i32,
    pub msg: Option<String>,
    pub data: Option<NewhouseModuleInfoData>,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct NewhouseModuleInfoData {
    #[serde(default = "default_layout")]
    pub layout: NewhouseLayoutBlock,
    pub market: Option<NewhouseMarket>,
    #[serde(default)]
    pub sales: NewhouseSalesData,
}

fn default_layout() -> NewhouseLayoutBlock {
    NewhouseLayoutBlock {
        total: 0,
        items: vec![],
        room_group: vec![],
    }
}

#[derive(Debug, Clone, Default, Deserialize)]
pub(crate) struct NewhouseSalesData {
    #[serde(default)]
    pub data: Vec<NewhouseSalesAgent>,
}

/// Aggregated result of `Client591::newhouse_detail` — the merged
/// output of 6 parallel sub-endpoint calls. Sub-calls that fail
/// independently land their error message in the corresponding
/// `*_error` field rather than failing the whole bundle; callers
/// inspecting the bundle should expect partial coverage on
/// projects with sparse data.
#[derive(Debug, Clone, Serialize)]
pub struct NewhouseDetail {
    pub housing: Option<NewhouseHousing>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub housing_error: Option<String>,

    pub modules: Option<NewhouseModules>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub modules_error: Option<String>,

    /// Categorized photo gallery (empty Vec if unavailable, distinct
    /// from `photos_error: Some(_)` which means the call failed).
    pub photos: Vec<NewhousePhotoCategory>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub photos_error: Option<String>,

    pub surrounding: Option<NewhouseSurrounding>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub surrounding_error: Option<String>,

    pub nearby_market: Option<NewhouseNearbyMarket>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub nearby_market_error: Option<String>,

    pub price_list: Option<NewhousePriceList>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub price_list_error: Option<String>,
}

/// Most-recent sale-control entry (the latest unit 591 has data on for a project).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseSaleCtrlPrice {
    pub id: u64,
    /// Unit address (`"A棟7樓09戶"`).
    pub address: String,
    /// Layout (`"2房"`, `"3房"`, …).
    pub room: String,
    pub unit_price: PriceValue,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseSaleCtrlInfo {
    /// How many price updates have been recorded.
    pub update_count: u64,
    pub price: NewhouseSaleCtrlPrice,
}

/// `/v1/price/list` response — project price catalogue.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhousePriceList {
    pub housing_id: u64,
    pub housing_name: String,
    /// Linked community ID (0 / null if pre-handover).
    #[serde(default, deserialize_with = "u64_string_or_int_default")]
    pub community_id: u64,
    /// Per-room average prices (e.g. 成交均價, 2房均價, …). Same
    /// shape as [`NewhouseMarketRoom`].
    #[serde(default)]
    pub rooms: Vec<NewhouseMarketRoom>,
    /// Whether 591 has sale-control data for this project.
    #[serde(default)]
    pub has_sale_ctrl: u8,
    /// Most-recent recorded unit (when `has_sale_ctrl: 1`).
    pub sale_ctrl_info: Option<NewhouseSaleCtrlInfo>,
    /// Per-unit transaction items (often empty for active pre-sale
    /// projects — module-info's `market.items` is usually richer).
    #[serde(default)]
    pub items: Vec<NewhouseMarketItem>,
    /// Total number of items across all pages.
    #[serde(default, deserialize_with = "u64_string_or_int_default")]
    pub total: u64,
    /// MM/DD of last 591-side refresh (`"04/21"`).
    #[serde(default)]
    pub update_date: String,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct NewhousePriceListResponse {
    pub status: i32,
    pub msg: Option<String>,
    pub data: Option<NewhousePriceList>,
}

/// `{content, unit}` pair — used by nearby-market for compact value+unit display.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ContentUnit {
    pub content: String,
    pub unit: String,
}

/// One nearby community resale comp from `/v1/detail/nearby-market`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseNearbyComm {
    pub community_id: u64,
    pub community_name: String,
    /// Total transactions on record.
    pub deal_count: u64,
    /// Average per-坪 price (e.g. `{content: "142.7", unit: "萬/坪"}`).
    pub price: ContentUnit,
    pub community_image: String,
    /// Internal type code (0/1).
    #[serde(default)]
    pub build_type: u8,
    /// Display string (`"預售屋"`, `"3年社區"`, `"5年社區"`, …).
    pub build_type_str: String,
    pub build_purpose: String,
    /// Layout summary (`{content: "1、2", unit: "房"}` = 1- and 2-bed units).
    pub layout: ContentUnit,
    /// Area range (`{content: "13~25", unit: "坪"}`).
    pub area: ContentUnit,
    /// Age in years (0 / null for pre-sale).
    #[serde(default, deserialize_with = "u32_string_or_int_default")]
    pub age: u32,
    /// Distance to the queried project in metres.
    pub distance: u64,
}

/// One nearby business / 商圈 from `/v1/detail/nearby-market`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseNearbyBusiness {
    pub id: u64,
    pub shop_id: u64,
    pub name: String,
    /// Average per-坪 price for the 商圈 (e.g. `"165.0"`).
    pub price_unit: String,
    pub unit: String,
}

/// Aggregate of `/v1/detail/nearby-market` data.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseNearbyMarket {
    /// Nearby communities (resale comps).
    #[serde(default)]
    pub community_items: Vec<NewhouseNearbyComm>,
    /// Nearby business districts (`商圈`).
    #[serde(default)]
    pub business_items: Vec<NewhouseNearbyBusiness>,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct NewhouseNearbyMarketResponse {
    pub status: i32,
    pub msg: Option<String>,
    pub data: Option<NewhouseNearbyMarket>,
}

/// One nearby POI from `/v1/detail/surrounding`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhousePoi {
    pub name: String,
    /// Walking distance in metres (591's own measurement).
    pub distance: u64,
    /// Pre-formatted distance string (`"距建案約876公尺"`).
    pub distance_text: String,
    pub lat: f64,
    pub lng: f64,
    /// Sub-type code (`"subway_station"`, `"bus_station"`,
    /// `"grade"` (elementary), `"middle"`, `"shopping_mall"`,
    /// `"department_store"`, …).
    pub sub_type: String,
}

/// Categorized POIs around a newhouse project, with totals.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseSurroundingFacility {
    /// Total POIs across all categories (591's own count).
    #[serde(default, deserialize_with = "u64_string_or_int_default")]
    pub total: u64,
    /// Transit (subway, bus, train).
    #[serde(default)]
    pub traffic: Vec<NewhousePoi>,
    /// Schools (elementary, middle, high, college).
    #[serde(default)]
    pub education: Vec<NewhousePoi>,
    /// Daily-life amenities (shops, restaurants, parks, …).
    #[serde(default)]
    pub life: Vec<NewhousePoi>,
}

/// `lat`/`lng` are wire-strings, not numbers — `MapCoord` parses them.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MapCoord {
    pub lat: String,
    pub lng: String,
    #[serde(default)]
    pub pending: u8,
}

/// Project location metadata from `/v1/detail/surrounding`'s housing block.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseSurroundingHousing {
    pub hid: u64,
    pub build_name: String,
    pub address: String,
    /// Project building location.
    pub map: MapCoord,
    /// Sales-office address.
    #[serde(default)]
    pub reception_address: String,
    /// Sales-office location.
    pub reception_map: MapCoord,
}

/// Aggregate of `/v1/detail/surrounding` data.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhouseSurrounding {
    pub facility: NewhouseSurroundingFacility,
    pub housing: NewhouseSurroundingHousing,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct NewhouseSurroundingResponse {
    pub status: i32,
    pub msg: Option<String>,
    pub data: Option<NewhouseSurrounding>,
}

/// One photo within a [`NewhousePhotoCategory`].
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhousePhoto {
    pub id: u64,
    /// Category code (`"logo"`, `"plan"`, `"realistic"`, `"circum"`, …).
    pub cate: String,
    /// Display category name (`"封面圖"`, `"平面圖"`, `"實景圖"`, `"環境圖"`, …).
    pub cate_name: String,
    /// Optional caption (e.g. `"捷運中山國中站"` for an environment photo).
    #[serde(default)]
    pub note: String,
    /// 900px-wide watermarked variant (the "main" gallery image).
    pub src_img: String,
    /// 160×120 thumbnail.
    #[serde(default)]
    pub small_img: String,
    /// 750px-wide variant (mobile-optimized).
    #[serde(default)]
    pub big_img: String,
    #[serde(default)]
    pub description: String,
}

/// One photo category bucket (cover / floor plan / traffic / 3D / real-life / environment).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct NewhousePhotoCategory {
    /// Category code (`"logo"`, `"plan"`, …).
    pub id: String,
    /// Display name (`"封面圖"`, `"平面圖"`, …).
    pub name: String,
    pub build_name: String,
    pub total: u64,
    #[serde(default)]
    pub items: Vec<NewhousePhoto>,
}

/// `/v1/detail/photos` returns `data` as a top-level array of
/// categories (not an object). This wrapper deserializes the
/// `{status, msg, data: [...]}` envelope into a Vec of categories.
#[derive(Debug, Clone, Deserialize)]
pub(crate) struct NewhousePhotosResponse {
    pub status: i32,
    pub msg: Option<String>,
    pub data: Option<Vec<NewhousePhotoCategory>>,
}

/// Top-level wrapper for `/v1/detail/base-info`. Other top-level
/// keys (`meta`, `nearby`, `dynamic`, `same_region_section`, etc.)
/// are dropped intentionally — call other `newhouse_*` methods for
/// those data dimensions.
#[derive(Debug, Clone, Deserialize)]
pub(crate) struct NewhouseBaseInfoResponse {
    pub status: i32,
    pub msg: Option<String>,
    pub data: Option<NewhouseBaseInfoData>,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct NewhouseBaseInfoData {
    pub housing: Option<NewhouseHousing>,
}

// ---------------------------------------------------------------------------
// /v1/high-value/search — premium-listing curated search
// ---------------------------------------------------------------------------

/// Inclusive numeric range with optional bounds. 591's high-value
/// endpoint accepts an array of these for `price` and `area`
/// filtering — both ends may be `null` to mean "no bound on this side".
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PriceRange {
    /// Lower bound in 萬 (10,000 NTD). `None` means no lower limit.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub start: Option<u32>,
    /// Upper bound in 萬. `None` means no upper limit.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub end: Option<u32>,
}

/// Inclusive area range in 坪 (Taiwanese unit, ~3.3 m²). Both ends optional.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AreaRange {
    #[serde(skip_serializing_if = "Option::is_none")]
    pub start: Option<f64>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub end: Option<f64>,
}

/// Request body for `Client591::high_value_search`. Most arrays are
/// "preferred" filters — empty Vec means "no preference"; populated
/// Vec biases the result toward matching listings but isn't strictly
/// enforced (591's curation overrides individual filters).
///
/// **Quirks observed live 2026-04-30:**
/// - Two `kind` values populate distinct curated pools: `9` (the
///   default, mostly residential) and `10` (a separate bucket with
///   different streets / `post_id`s). `0` is treated server-side as
///   `9`. Other values (1..8, 11+) yield empty arrays.
/// - The wire-side `kind: 9` here is NOT "land" (as on rent
///   endpoints) — it tags the curated premium pool; returned items
///   are mostly residentials (e.g. `"3房2廳"`).
/// - `section_id` filtering is non-strict (results may include
///   sections not in the requested list).
/// - `type: 2` is the only observed value (sale-side curation).
#[derive(Debug, Clone, Serialize)]
pub struct HighValueParams {
    pub region_id: u32,
    /// Curated-pool tag. Only `9` returns non-empty results today.
    pub kind: u32,
    /// `2` = sale-side curation.
    #[serde(rename = "type")]
    pub kind_type: u32,
    #[serde(default)]
    pub section_id: Vec<u32>,
    /// 591 sends shape codes as strings (e.g. `["2"]`), not ints.
    #[serde(default)]
    pub shape: Vec<String>,
    #[serde(default)]
    pub room: Vec<u32>,
    #[serde(default)]
    pub price: Vec<PriceRange>,
    #[serde(default)]
    pub area: Vec<AreaRange>,
}

impl HighValueParams {
    /// Convenience constructor: every filter empty, `region_id`
    /// defaulted to Taipei, `kind=9` (the only kind that returns
    /// data), `type=2` (sale).
    pub fn for_region(region_id: u32) -> Self {
        Self {
            region_id,
            kind: 9,
            kind_type: 2,
            section_id: vec![],
            shape: vec![],
            room: vec![],
            price: vec![],
            area: vec![],
        }
    }
}

/// One curated premium-listing result from `/v1/high-value/search`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HighValueListing {
    pub post_id: u64,
    pub title: String,
    /// Listing type (`2` = sale, observed).
    #[serde(rename = "type")]
    pub kind_type: u32,
    /// Curated-pool tag (always `9` in observed responses).
    pub kind: u32,
    /// Total price in `unit` (typically 萬 = 10,000 NTD). Always
    /// populated in observed responses (verified across 39 live samples
    /// spanning 6 regions, 2026-04-30); deserializer accepts string-int
    /// for forward-compat with the SaleListData.total wire flip but
    /// fails loudly on null — consistent with the loud-fail policy on
    /// sibling required-numerics (area, room, hall, toilet).
    #[serde(deserialize_with = "u64_string_or_int")]
    pub price: u64,
    /// Price unit string (`"萬"`).
    pub unit: String,
    /// Area in `area_unit`.
    pub area: f64,
    /// Area unit (`"坪"`).
    pub area_unit: String,
    /// Per-坪 price (e.g. `114.1` 萬/坪).
    pub unit_price: f64,
    /// Bedrooms.
    pub room: u32,
    /// 廳 (living rooms).
    pub hall: u32,
    /// 衛 (bathrooms).
    pub toilet: u32,
    /// Pre-formatted layout (`"3房2廳1衛"`).
    pub layout: String,
    pub region_name: String,
    pub section_name: String,
    /// Street name (e.g. `"建國南路一段"`).
    pub street_name: String,
    /// Cover image URL.
    pub cover: String,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct HighValueSearchResponse {
    pub status: i32,
    #[serde(default)]
    pub msg: String,
    #[serde(default)]
    pub data: Vec<HighValueListing>,
}

// ---------------------------------------------------------------------------
// /v1/coordinate/area — GPS lat/lng → 591 region/section reverse-geocode
// ---------------------------------------------------------------------------

/// 591 region+section pair resolved from GPS coordinates.
///
/// Returned by `Client591::coordinate_area`. Field semantics match
/// the existing `REGIONS` table — `region_id` indexes into it (1 =
/// Taipei), and `section_id` is the 591-internal district code
/// within that region (e.g. 信義區 within Taipei is `section_id: 7`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CoordArea {
    pub region_id: u32,
    pub region_name: String,
    pub section_id: u32,
    pub section_name: String,
}

/// Internal wire-shape wrapper for `/v1/coordinate/area`.
///
/// 591 returns two distinct `data` shapes:
/// - **Hit** (coords in Taiwan): `{"status":1,"data":{"area":{...}}}`
/// - **Miss** (off-Taiwan): `{"status":0,"msg":"坐标不在台湾范围内","data":[]}`
///
/// `data` is typed as raw `serde_json::Value` because the `[]` vs
/// `{area: …}` polymorphism would defeat a typed struct. The
/// adapter dispatches on `status` and only deserializes the hit
/// shape into [`CoordArea`].
#[derive(Debug, Clone, Deserialize)]
pub(crate) struct CoordResponse {
    pub status: i32,
    #[serde(default)]
    pub msg: String,
    #[serde(default)]
    pub data: serde_json::Value,
}

// ---------------------------------------------------------------------------
// /v2/web/rent/detail — single rent listing detail
// /v1/ware/photos     — categorized photo gallery
// ---------------------------------------------------------------------------

/// One labelled key/value pair. Used pervasively in `RentDetail`'s
/// `info` / `cost.data` / `houseInfo.data` arrays — 591 wraps every
/// surfaced fact this way so the website can display label+value
/// rows without front-end string mapping.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LabelledValue {
    /// Display label (`"類型"`, `"押金"`, `"管理費"`, `"租期"`, …).
    pub name: String,
    /// Display value (`"獨立套房"`, `"500元/月"`, `"一年"`, …).
    pub value: String,
    /// Stable key for programmatic lookup (`"kind"`, `"deposit"`,
    /// `"manageprice"`, `"leaseTime"`, …).
    pub key: String,
}

/// One tag attached to a rent listing (`{id: 16, value: "新上架"}`).
/// IDs are stable (e.g. `2` = 近捷運, `16` = 新上架, `19` = 社會住宅).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RentTag {
    pub id: u32,
    pub value: String,
}

/// Free-form listing description block.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RentRemark {
    /// `"屋況介紹"`.
    #[serde(default)]
    pub title: String,
    /// Stable key (`"remark"`).
    #[serde(default)]
    pub key: String,
    /// Visibility flag (1 = visible).
    #[serde(default)]
    pub active: u32,
    /// Free-form Chinese description text from the lister. Defaults
    /// to empty when 591 omits it for a maintenance-state listing.
    #[serde(default)]
    pub content: String,
}

/// One amenity entry within [`RentServiceTable::facility`].
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RentServiceItem {
    /// Stable amenity key (`"fridge"`, `"washer"`, `"tv"`, `"cold"`,
    /// `"heater"`, `"bed"`, `"closet"`, `"fourth"`, `"net"`, …).
    pub key: String,
    /// Display name (`"冰箱"`, `"洗衣機"`, `"電視"`, …).
    pub name: String,
    /// 1 = provided in this rental, 0 = not provided. The wire
    /// response always carries every amenity in the master list,
    /// even those not provided — `active` is the discriminator.
    #[serde(default)]
    pub active: u32,
}

/// One usage-rule entry within [`RentServiceTable::notice`].
/// Examples: `{key: "leaseTime", name: "最短一年"}`,
/// `{key: "pet", name: "不可養寵物"}`, `{key: "cook", name: "不可開伙"}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RentNoticeItem {
    pub key: String,
    pub name: String,
}

/// `RentDetail.service` — provided amenities + usage rules.
///
/// Distinct shape from [`RentFactTable`] (which uses a `data` array).
/// `service` returns `{title, active, facility, notice}` where each
/// facility row carries an `active` discriminator (so callers can
/// filter to *actually-provided* amenities) and `notice` carries
/// usage rules that don't fit the cost-table model.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RentServiceTable {
    /// `"提供設備"`.
    #[serde(default)]
    pub title: String,
    #[serde(default)]
    pub active: u32,
    /// Master amenity list, including not-provided rows
    /// (`active: 0`). Filter by `active == 1` for the "what's actually
    /// provided" subset.
    #[serde(default)]
    pub facility: Vec<RentServiceItem>,
    /// Usage rules / lease constraints (lease term, pet policy,
    /// cooking allowed, …).
    #[serde(default)]
    pub notice: Vec<RentNoticeItem>,
}

/// Listing publish state — when it went online + when it was last refreshed.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct RentPublish {
    pub id: u32,
    /// Display name (`"新發佈"`, `"已上架"`, …).
    pub name: String,
    /// Stable key (`"new"`, `"old"`, …).
    pub key: String,
    /// `"此房屋在13小時前發佈"` etc.
    #[serde(default)]
    pub post_time: String,
    /// `"19分鐘內更新"` etc.
    #[serde(default)]
    pub update_time: String,
}

/// Listing address with GPS coordinates.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RentAddress {
    /// Display address (`"中山區雙城街50號"`).
    pub data: String,
    /// Sometimes-redundant fuller form (591 occasionally double-prints).
    #[serde(default)]
    pub value: String,
    /// Latitude as wire-string (parse with `.parse::<f64>()`).
    pub lat: String,
    /// Longitude as wire-string.
    pub lng: String,
    /// Nearest transit summary (often empty — see `RentDetail.surround`
    /// for structured POIs).
    #[serde(default)]
    pub traffic: String,
    #[serde(default)]
    pub station: String,
    #[serde(default)]
    pub distance: String,
}

/// Listing's primary contact (agent or owner).
///
/// **Wire shape is polymorphic** — verified live 2026-04-30: 591
/// inconsistently returns this as either a named-field object
/// (`{"name":"程先生","role":3,...}`) OR an array of K/V pairs
/// (`[{"key":"name","value":"程先生"},{"key":"role","value":3},...]`).
/// Both forms carry the same data; the discriminator appears
/// load-balancer- or A/B-driven.
///
/// To handle both, this is stored as a raw `serde_json::Value` and
/// queried via accessor methods (`name()`, `role_name()`, `mobile()`,
/// etc.) that dispatch on the wire shape.
pub type RentLinkInfo = serde_json::Value;

/// Helpers for reading [`RentLinkInfo`] under either wire shape.
pub trait RentLinkInfoExt {
    /// Read a string field by key (e.g. `"name"`, `"mobile"`,
    /// `"roleName"`). Returns `None` if absent or the wire-side value
    /// isn't a string.
    fn link_str(&self, key: &str) -> Option<&str>;
    /// Read a u64 field by key (e.g. `"uid"`, `"imUid"`, `"shopId"`).
    fn link_u64(&self, key: &str) -> Option<u64>;
    /// Read a u32 field by key (e.g. `"role"`, `"isAgent"`).
    fn link_u32(&self, key: &str) -> Option<u32>;
}

impl RentLinkInfoExt for RentLinkInfo {
    fn link_str(&self, key: &str) -> Option<&str> {
        if let Some(obj) = self.as_object() {
            // Object form: direct key lookup.
            obj.get(key).and_then(|v| v.as_str())
        } else if let Some(arr) = self.as_array() {
            // Array form: scan for {key: <key>, value: ...}.
            arr.iter()
                .find(|e| e.get("key").and_then(|k| k.as_str()) == Some(key))
                .and_then(|e| e.get("value").and_then(|v| v.as_str()))
        } else {
            None
        }
    }
    fn link_u64(&self, key: &str) -> Option<u64> {
        if let Some(obj) = self.as_object() {
            obj.get(key).and_then(|v| v.as_u64())
        } else if let Some(arr) = self.as_array() {
            arr.iter()
                .find(|e| e.get("key").and_then(|k| k.as_str()) == Some(key))
                .and_then(|e| e.get("value").and_then(|v| v.as_u64()))
        } else {
            None
        }
    }
    fn link_u32(&self, key: &str) -> Option<u32> {
        self.link_u64(key).and_then(|v| u32::try_from(v).ok())
    }
}

/// One section in the cost / houseInfo / similar fact-tables.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RentFactTable {
    pub title: Option<String>,
    /// Visibility flag (1 = active/visible).
    #[serde(default)]
    pub active: u32,
    /// Labelled key/value rows.
    #[serde(default)]
    pub data: Vec<LabelledValue>,
}

/// One nearby POI within `RentDetail.surround.data[].children`.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct RentSurroundPoi {
    /// `"subway"`, `"bus"`, `"school"`, `"market"`, …
    #[serde(rename = "type")]
    pub kind: String,
    pub name: String,
    /// Walking distance in metres.
    pub distance: u64,
    /// `"距房屋約558公尺"`.
    #[serde(default)]
    pub distance_txt: String,
}

/// One category of surrounding POIs (`{name: "交通", key: "traffic", children: [...]}`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RentSurroundCategory {
    /// Display name (`"交通"`, `"教育"`, `"生活"`, …).
    pub name: String,
    /// Stable key (`"traffic"`, `"education"`, `"life"`).
    pub key: String,
    #[serde(default)]
    pub children: Vec<RentSurroundPoi>,
}

/// Surrounding POIs block — categorized like `NewhouseSurroundingFacility`
/// but with a different wire shape (rent-side uses categorized children
/// with `key`/`name`; newhouse-side uses flat top-level keys).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RentSurround {
    pub title: String,
    pub key: String,
    pub address: String,
    /// Project lat/lng as wire-strings.
    pub lat: String,
    pub lng: String,
    #[serde(default)]
    pub data: Vec<RentSurroundCategory>,
}

/// Single-listing detail from `bff-house.591.com.tw/v2/web/rent/detail`.
///
/// Curated subset of the wire `data` block (~30 top-level fields →
/// ~17 surfaced). Skipped fields: `gtm_detail_data`, `meta`, `navData`,
/// `shareInfo`, `favData`, `containCost`, `relieved`, `version`,
/// `information` (alt of `info`) — telemetry / SEO / rendering
/// metadata that adds noise without value.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct RentDetail {
    pub title: String,
    /// Display price (`"17,800"` — note the comma).
    pub price: String,
    /// Price unit (`"元/月"`).
    pub price_unit: String,
    /// Deposit display (`"押金面議"` or `"2個月"`).
    pub deposit: String,
    /// Pre-formatted headline (`"17,800元/月"`).
    pub head_info: String,
    pub address: RentAddress,
    pub region_id: u32,
    pub section_id: u32,
    /// House-kind code: 1=整層, 2=獨立套房, 3=分租套房, 8=雅房, 6=辦公, 24=車位.
    pub kind: u32,
    /// Listing status (`"open"`, `"closed"`).
    pub status: String,
    /// Quick-fact rows (類型 / 使用坪數 / 樓層 / 型態).
    #[serde(default)]
    pub info: Vec<LabelledValue>,
    /// Cost breakdown (押金 / 管理費 / 仲介費).
    pub cost: RentFactTable,
    /// Detailed house attributes (租期, 入住, 身份, 法定用途, …).
    pub house_info: RentFactTable,
    /// Tenant preferences (養寵物 / 開伙 / 性別偏好 / …) — same fact-table shape.
    pub preference: RentFactTable,
    /// Provided amenities (`facility[]`) + usage rules (`notice[]`).
    /// Distinct shape from the other fact-tables — see [`RentServiceTable`].
    pub service: RentServiceTable,
    /// Surrounding POIs categorized by traffic/education/life.
    pub surround: RentSurround,
    pub tags: Vec<RentTag>,
    /// Publish/refresh metadata.
    pub publish: RentPublish,
    /// Free-form listing description (`{title, key, active, content}`).
    pub remark: RentRemark,
    /// Primary contact (agent / owner).
    pub link_info: RentLinkInfo,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct RentDetailResponse {
    pub status: i32,
    #[serde(default)]
    pub msg: String,
    pub data: Option<RentDetail>,
}

/// One photo within a [`RentPhotoGroup`].
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct RentPhoto {
    pub photo_id: u64,
    /// 1000px-wide watermarked variant (the gallery image).
    pub photo: String,
    /// 600px-tall variant.
    #[serde(default)]
    pub orig_photo: String,
    /// 400×300 thumbnail.
    #[serde(default)]
    pub thumb_photo: String,
    /// 1 if this is the cover photo, 0 otherwise.
    #[serde(default)]
    pub is_cover: u32,
    /// Purpose code (10 = cover, 12 = bedroom, etc. — see
    /// `RentPhotosData.purposes` for the lookup table per response).
    #[serde(default)]
    pub purpose: u32,
    /// Optional caption.
    #[serde(default)]
    pub note: String,
    /// Wire type code (3 observed).
    #[serde(default, rename = "type")]
    pub kind: u32,
}

/// One bucket of photos within `/v1/ware/photos`'s `data.list`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RentPhotoGroup {
    /// Group key (`"picture"`, `"floor"`, `"environment"`, …).
    pub key: String,
    #[serde(default)]
    pub items: Vec<RentPhoto>,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct RentPhotosResponse {
    pub status: i32,
    #[serde(default)]
    pub msg: String,
    pub data: Option<RentPhotosData>,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct RentPhotosData {
    #[serde(default)]
    pub list: Vec<RentPhotoGroup>,
}

// ---------------------------------------------------------------------------
// /v1/touch/sale/detail   — single sale listing detail
// /v2/web/sale/similar-wares — similar sale listings
// ---------------------------------------------------------------------------

/// Single sale listing detail from `bff-house.591.com.tw/v1/touch/sale/detail`.
///
/// Curated subset of the wire `data` block (~150 fields → ~30 surfaced).
/// Most fields are wire-strings (591 stringly-types numeric IDs and
/// coordinates on this endpoint — `region_id`, `room`, `lat`/`lng`,
/// `houseage` etc. all arrive as strings). To stay loyal to the wire
/// without forcing risky parses, identifiers + coords stay as `String`
/// — callers `.parse::<f64>()` / `.parse::<u32>()` as needed.
///
/// **The wire `id` field has an `S` prefix** (e.g. `"S19599759"`).
/// Pass the bare numeric ID to `Client591::sale_detail` and the
/// adapter prepends `S` for you.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SaleDetail {
    /// Wire ID with `S` prefix (e.g. `"S19599759"`).
    pub id: String,
    pub title: String,
    /// Pre-formatted price (`"1,988萬元"`).
    pub price: String,
    /// Numeric price as a wire-string (`"1988"`, in 萬).
    pub price_value: String,
    /// Per-坪 price string (`"86.02萬/坪"`).
    pub unitprice: String,
    /// Pre-formatted area (`"23.111坪"`).
    pub area: String,
    /// Numeric area as wire-string (`"23.111"`).
    pub area_value: String,
    /// Pre-formatted layout (`"3房2廳3衛"`).
    pub layout: String,
    /// Number of bedrooms as wire-string (`"3"`).
    pub room: String,
    /// Number of living rooms as wire-string.
    pub hall: String,
    /// Number of bathrooms as wire-string.
    pub toilet: String,
    /// Display kind (`"住宅"`, `"商業"`, `"辦公"`, …).
    pub kind: String,
    /// Numeric kind code as wire-string (`"9"` = residential, …).
    pub kind_id: String,
    pub region: String,
    /// Wire-string region ID — `.parse::<u32>()` for numeric.
    pub region_id: String,
    pub section: String,
    pub section_id: String,
    /// Display address (often empty for owner-direct rentals — see
    /// `lat`/`lng` for coordinates).
    #[serde(default)]
    pub addr: String,
    /// Latitude as wire-string.
    pub lat: String,
    /// Longitude as wire-string.
    pub lng: String,
    /// Age string (`"56年"`).
    #[serde(default)]
    pub age: String,
    /// Numeric age as wire-string (`"56"`).
    #[serde(default)]
    pub houseage: String,
    /// Building shape (`"透天厝"`, `"電梯大樓"`, `"公寓"`, …).
    #[serde(default)]
    pub shape: String,
    /// Decoration level (`"中檔裝潢"`, `"無"`, …).
    #[serde(default)]
    pub fitment: String,
    /// Direction (`"東南"`, `"南"`, …).
    #[serde(default)]
    pub direction: String,
    /// Lift-availability flag as wire-string (`"0"` / `"1"`).
    #[serde(default)]
    pub lift: String,
    /// Pre-formatted parking text (`"無"`, `"1個"`, …).
    #[serde(default)]
    pub parking: String,
    /// Main usable area (`"20.69坪"`).
    #[serde(default)]
    pub mainarea: String,
    /// Management fee text (`"500元/月"`, `"無"`, …). Sentinel
    /// `"99999"` on the numeric `manageprice` indicates "not applicable".
    #[serde(default)]
    pub managefee: String,
    /// Unix timestamp of post (as wire-string).
    pub posttime: String,
    /// Linked community name (empty for owner-direct without community).
    #[serde(default)]
    pub community: String,
    /// Linked community ID (empty string for unlinked).
    #[serde(default)]
    pub community_id: String,
    /// Listing's primary contact (the `linkman` / agent / owner).
    pub linkman: String,
    /// Mobile phone (`"0965-109-089"`).
    #[serde(default)]
    pub mobile: String,
    /// Landline.
    #[serde(default)]
    pub telephone: String,
    /// Email address.
    #[serde(default)]
    pub email: String,
    /// Display contact role (`"仲介"` / `"屋主"`).
    pub identity: String,
    /// Agent shop / company.
    #[serde(default)]
    pub company_name: String,
    /// Agent certificate type (`"Middleman"` etc.).
    #[serde(default)]
    pub certificate_type: String,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct SaleDetailResponse {
    pub status: i32,
    /// `Option<String>` because 591 returns `"msg": null` on this
    /// endpoint when status=1 — `#[serde(default)]` alone wouldn't
    /// cover the explicit-null case (it only covers missing keys).
    #[serde(default)]
    pub msg: Option<String>,
    pub data: Option<SaleDetail>,
}

/// One similar sale listing from `bff-house.591.com.tw/v2/web/sale/similar-wares`.
/// Wire is heavily stringly-typed (every numeric is a string) — the
/// type stays loyal to that and lets callers parse as needed.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SaleSimilarWare {
    /// Wire-string listing type code (`"2"` = sale).
    #[serde(rename = "type")]
    pub kind_type: String,
    pub post_id: String,
    pub title: String,
    /// Pre-formatted price (`"1980"` in 萬, no thousands separator).
    pub price: String,
    /// Pre-formatted area (`"20.808"` in 坪).
    pub area: String,
    /// Wire-string house-kind code.
    pub kind: String,
    /// Layout summary (`"6房6衛"`).
    #[serde(default)]
    pub room: String,
    pub section_name: String,
    /// Cover image URL.
    pub photo_url: String,
    /// Marketing tag string (often empty).
    #[serde(default)]
    pub tag: String,
    /// `"vip"`/`"refresh"`/etc. — empty when no special boost.
    #[serde(default)]
    pub similar_type: String,
    /// 1 = boosted/premium listing.
    #[serde(default)]
    pub is_vip: String,
    /// 1 = recently refreshed.
    #[serde(default)]
    pub is_refresh: String,
    /// 1 = combined / bundled ad slot (591 groups some listings for
    /// joint promotion). Useful for filtering boost-grouped duplicates.
    #[serde(default)]
    pub is_combine: String,
}

#[derive(Debug, Clone, Deserialize)]
pub(crate) struct SaleSimilarWaresResponse {
    pub status: i32,
    /// `Option<String>` for the same reason as `SaleDetailResponse.msg` —
    /// 591 occasionally returns `"msg": null` on these envelopes.
    #[serde(default)]
    pub msg: Option<String>,
    #[serde(default)]
    pub data: Vec<SaleSimilarWare>,
}

// ---------------------------------------------------------------------------
// Internal response wrappers (not exposed publicly)
// ---------------------------------------------------------------------------

#[derive(Deserialize)]
pub(crate) struct HotResponse {
    pub status: i32,
    pub data: Option<Vec<Community>>,
}

#[derive(Deserialize)]
pub(crate) struct NearbyResponse {
    pub status: i32,
    pub data: Option<Vec<NearbyApiItem>>,
}

/// 591's nearby payload uses snake_case keys that don't match
/// `NearbyCommunity` exactly (e.g. `regionid`/`sectionid` vs
/// `region_id`/`section_id`). This wrapper deserializes the wire
/// shape verbatim; `Client591::nearby` maps to `NearbyCommunity`.
///
/// **Maintenance:** when adding a new field to `NearbyCommunity`,
/// add the matching field here AND extend the `From` impl below.
/// Alternative would be `#[serde(rename = "regionid")]` directly on
/// `NearbyCommunity`, but the wrapper-pattern matches the rest of
/// this crate's response types.
#[derive(Deserialize)]
pub(crate) struct NearbyApiItem {
    pub id: u64,
    pub name: String,
    pub regionid: u32,
    pub sectionid: u32,
    pub region: String,
    pub section: String,
    pub price_unit: PriceValue,
    pub address: String,
    pub full_address: String,
    pub age: String,
    pub house_holds: String,
    pub build_purpose: String,
    pub distance: String,
    // TODO: `sale_num` is a sibling count-field on the same wire
    // shape as `min_price`. 591 has historically type-flipped count
    // fields (saw min_price flip from int → string in early 2026).
    // If `sale_num` flips next, wrap it the same way; the live test
    // `nearby_eat_returns_taipei_neighbours` will catch it.
    pub sale_num: u32,
    /// 591 returns this as either a JSON int or a JSON string
    /// depending on the day. Custom deserializer accepts both.
    #[serde(deserialize_with = "u64_string_or_int")]
    pub min_price: u64,
}

impl From<NearbyApiItem> for NearbyCommunity {
    fn from(v: NearbyApiItem) -> Self {
        NearbyCommunity {
            id: v.id,
            name: v.name,
            region_id: v.regionid,
            section_id: v.sectionid,
            region: v.region,
            section: v.section,
            price_unit: v.price_unit,
            address: v.address,
            full_address: v.full_address,
            age: v.age,
            house_holds: v.house_holds,
            build_purpose: v.build_purpose,
            distance: v.distance,
            sale_num: v.sale_num,
            min_price: v.min_price,
        }
    }
}

#[derive(Deserialize)]
pub(crate) struct DetailResponse {
    pub status: i32,
    pub data: Option<DetailData>,
}

#[derive(Deserialize)]
pub(crate) struct SaleListResponse {
    pub status: i32,
    pub data: Option<SaleListData>,
}

#[derive(Deserialize, Default)]
pub(crate) struct SaleListData {
    /// 591 returns this as a string (`"23899"`) on this endpoint —
    /// not an int like elsewhere. `u32_string_or_int` handles both.
    #[serde(default, deserialize_with = "u32_string_or_int_default")]
    pub total: u32,
    /// Raw items — 591 mixes paid newhouse ads (with a different
    /// schema) into the sale-listing array. We deserialize per-item
    /// in the adapter and drop ads.
    #[serde(default)]
    pub house_list: Vec<serde_json::Value>,
}

/// `u64` variant of [`u32_string_or_int`]. Used for `NearbyApiItem::
/// min_price` — 591 sometimes serializes this as a string (`"2380"`),
/// sometimes as an integer (`2380`); empirically the wire form
/// changed without notice in early 2026.
fn u64_string_or_int<'de, D: Deserializer<'de>>(d: D) -> Result<u64, D::Error> {
    let v = serde_json::Value::deserialize(d)?;
    match v {
        serde_json::Value::String(s) => s.parse().map_err(serde::de::Error::custom),
        serde_json::Value::Number(n) => n
            .as_u64()
            .ok_or_else(|| serde::de::Error::custom(format!("u64 out of range: {n}"))),
        other => Err(serde::de::Error::custom(format!(
            "expected string or integer for u64, got {other:?}"
        ))),
    }
}

/// Like [`u64_string_or_int`] but also accepts `null` (returns 0) so
/// it composes with `#[serde(default)]`.
fn u64_string_or_int_default<'de, D: Deserializer<'de>>(d: D) -> Result<u64, D::Error> {
    let v = serde_json::Value::deserialize(d)?;
    match v {
        serde_json::Value::Null => Ok(0),
        serde_json::Value::String(s) => s.parse().map_err(serde::de::Error::custom),
        serde_json::Value::Number(n) => n
            .as_u64()
            .ok_or_else(|| serde::de::Error::custom(format!("u64 out of range: {n}"))),
        other => Err(serde::de::Error::custom(format!(
            "expected null/string/integer, got {other:?}"
        ))),
    }
}

/// Like [`u32_string_or_int`] but also accepts `null` (returns 0) so
/// it composes with `#[serde(default)]`.
fn u32_string_or_int_default<'de, D: Deserializer<'de>>(d: D) -> Result<u32, D::Error> {
    let v = serde_json::Value::deserialize(d)?;
    match v {
        serde_json::Value::Null => Ok(0),
        serde_json::Value::String(s) => s.parse().map_err(serde::de::Error::custom),
        serde_json::Value::Number(n) => n
            .as_u64()
            .and_then(|n| u32::try_from(n).ok())
            .ok_or_else(|| serde::de::Error::custom(format!("u32 out of range: {n}"))),
        other => Err(serde::de::Error::custom(format!(
            "expected null/string/integer, got {other:?}"
        ))),
    }
}

#[derive(Deserialize)]
pub(crate) struct NewhouseListResponse {
    pub status: i32,
    pub data: Option<NewhouseListData>,
}

#[derive(Deserialize)]
pub(crate) struct NewhouseListData {
    pub total: u32,
    pub online_total: u32,
    pub page: u32,
    pub per_page: u32,
    pub total_page: u32,
    /// Raw items — 591 mixes empty placeholder slots into the array.
    /// Per-item `from_value` + filter_map drops them.
    pub items: Vec<serde_json::Value>,
}

#[derive(Deserialize)]
pub(crate) struct CommunityRankResponse {
    pub status: i32,
    pub data: Option<CommunityRankApiData>,
}

#[derive(Deserialize)]
pub(crate) struct CommunityRankApiData {
    pub price_data: CommunityRankSlot,
    pub sale_data: CommunityRankSlot,
}

#[derive(Deserialize)]
pub(crate) struct CommunityRankSlot {
    pub data: Vec<CommunityRankItem>,
    pub time: String,
}

#[derive(Deserialize)]
pub(crate) struct DetailData {
    pub community: Option<CommunityDetail>,
    pub price: Option<PriceData>,
    pub sale: Option<SaleData>,
}

#[derive(Deserialize)]
pub(crate) struct PriceData {
    pub items: Vec<PriceRecord>,
}

#[derive(Deserialize)]
pub(crate) struct SaleData {
    pub total: u32,
    pub rooms: Vec<SaleRoom>,
}

#[derive(Deserialize)]
pub(crate) struct SaleRoom {
    pub items: Vec<SaleListing>,
}