//! FIFA 17 **card-definition identity catalog** and owned-item **wire-id policy**.
//!
//! Two distinct identities (never conflate them):
//!
//! * **Card definition** — *what card is this?* A semantic OpenFUT
//!   `CardDefinitionId` maps to a FIFA 17 render identity here:
//!   `resource_id = (version << 24) | asset_id`. The client resolves
//!   `resource_id & 0xFFFFFF` (= `asset_id`) against its own local player DB;
//!   an invented id renders a blank card, so this catalog is authored from
//!   verified FIFA 17 data (`pool.json` player asset ids), never guessed.
//! * **Owned-item instance** — *which exact copy?* A monotonic integer wire id,
//!   allocated per account by the generic external-identity store; this module
//!   only holds the FIFA 17 numeric **policy** ([`Fifa17WireItemIdPolicy`]).
//!
//! The catalog is game DATA (a versioned JSON file), not deployment config, and
//! not a generic-Core concern. Unknown definitions resolve to `None` — callers
//! drop them, never fabricate an asset id.

use std::collections::HashMap;

use serde::Deserialize;

use crate::fut::content_taxonomy::ContentKind;

/// The FIFA 17 render identity of a card definition. `version` is the high byte
/// of `resource_id`; `asset_id` (the low 24 bits) is the real FIFA player id.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Fifa17CardIdentity {
    pub asset_id: u32,
    pub version: u8,
    pub resource_id: u32,
    /// FIFA wire `rareflag` (rare/special card TYPE). Carried so specials render
    /// as specials; observed metadata, not a guessed label.
    pub rareflag: i64,
    /// Content class of this definition. A catalog authored before this field
    /// existed defaults to [`ContentKind::Player`] (backward compatible).
    pub kind: ContentKind,
    /// FIFA `cardsubtypeid` for a non-player definition (consumable family /
    /// staff role), `0` for a player or when absent.
    pub subtype: i64,
    /// FIFA card-art class. Players default to `asset_id`; kit definitions carry
    /// the verified `fcc_kitcards.cardassetid` value (`35`).
    pub card_asset_id: u32,
    /// Source team id for a club kit, or a manager's real club. Zero for content
    /// kinds that do not use it.
    pub team_id: i64,
    /// Manager chemistry nation (`managercards.nation`), zero when unused.
    ///
    /// The client NEVER supplies this: the managercards merge (`FUN_1801356c0`)
    /// leaves the manager-only record slot `rec+0xde` untouched, so the server is
    /// its only source. See `fifa17-recon/tools/fut_staff.py`.
    pub nation: i64,
    /// Manager chemistry league, zero when unused. Derived upstream through
    /// `manager.teamid` → `leagueteamlinks.leagueid`, because `managercards` has
    /// no league column. Lands in the equally untouched slot `rec+0xe0`.
    pub league_id: i64,
    /// EA's authored `rating` for a NON-PLAYER definition (`fcc_*.rating`), which
    /// Core does not model: an imported consumable's Core `overall` is 0, while
    /// the client's own copies carry 55..95 and the value drives the card level
    /// (`rec+0x54`) and therefore its quick-sell price. `None` → the caller falls
    /// back to Core's rating, which stays authoritative for players.
    pub rating: Option<u8>,
    /// `amount` (atom 0x1b) for a consumable definition — the bonus magnitude EA
    /// authored in the `fcc_*` row (+5 / +10 / +15 …). MANDATORY for the
    /// training, healing, fitness, play-style and manager-league families:
    /// omitting the key draws "-1" on the card, not "0".
    pub amount: Option<i64>,
    /// `contract` (atom 0xb8) for a contract-card definition (`cardsubtypeid`
    /// 201/202) — the number of matches the card grants. `fcc_contractcards` has
    /// no amount column, so this value comes from observed data; it is never
    /// defaulted here.
    pub contract: Option<i64>,
}

/// The FIFA 17 numeric namespace policy for owned-item wire ids.
///
/// Owned-item ids are monotonic from `OWNED_ITEM_BASE + 1` (= 100_000_001,
/// matching the oracle's `ITEM_ID_BASE = 100_000_000` and its first minted id),
/// staying below the synthetic-overlay ranges the responder uses (≥ 9e8). The
/// generic store enforces monotonicity/uniqueness; this type supplies the game,
/// entity-kind and base floor.
pub struct Fifa17WireItemIdPolicy;

impl Fifa17WireItemIdPolicy {
    pub const GAME: &'static str = "fifa17";
    pub const OWNED_ITEM_KIND: &'static str = "owned-item";
    pub const OWNED_ITEM_BASE: i64 = 100_000_000;

    /// First owned-item wire id (`100_000_001`).
    pub fn owned_item_base_floor() -> i64 {
        Self::OWNED_ITEM_BASE + 1
    }

    /// Identity scope for MATCH session ids.
    ///
    /// A match id is deliberately NOT drawn from the owned-item scope. The
    /// oracle mints both from one counter, which is why an observed match id
    /// looks like an item id — but that is an artifact of a single-counter save
    /// file, not a client requirement. Here the identity store keeps a real
    /// reverse map, so an item-scoped match id would make
    /// `owned_id_for_wire` resolve a match to a bogus owned card and corrupt
    /// quick-sell and move. The store is generic over `(game, kind)`, so a
    /// separate scope costs one constant and cannot collide with, or advance,
    /// the owned-item watermark.
    pub const MATCH_KIND: &'static str = "match";

    /// Base for match session ids. Clear of the owned-item range
    /// (`100_000_000+`) and of every synthetic overlay range the responder
    /// reserves (`≥ 9e8`). The client only requires a non-zero int.
    pub const MATCH_BASE: i64 = 200_000_000;

    /// First match wire id (`200_000_001`).
    pub fn match_base_floor() -> i64 {
        Self::MATCH_BASE + 1
    }
}

/// Highest representable asset id (24 bits); above this `version` would be
/// clobbered in `resource_id`.
const MAX_ASSET_ID: u32 = 0x00FF_FFFF;
const SCHEMA_VERSION: u32 = 1;

/// Catalog load/validation errors — all explicit, no silent fallback.
#[derive(Debug, PartialEq, Eq)]
pub enum CatalogError {
    BadSchemaVersion(u32),
    WrongGame(String),
    AssetTooLarge {
        card_id: String,
        asset_id: u32,
    },
    DuplicateResource {
        resource_id: u32,
        first: String,
        second: String,
    },
    Parse(String),
}

impl std::fmt::Display for CatalogError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            CatalogError::BadSchemaVersion(v) => {
                write!(f, "unsupported catalog schema_version {v}")
            }
            CatalogError::WrongGame(g) => write!(f, "catalog game is '{g}', expected 'fifa17'"),
            CatalogError::AssetTooLarge { card_id, asset_id } => {
                write!(f, "card '{card_id}' asset_id {asset_id} exceeds 24 bits")
            }
            CatalogError::DuplicateResource {
                resource_id,
                first,
                second,
            } => write!(
                f,
                "resource_id {resource_id} claimed by both '{first}' and '{second}'"
            ),
            CatalogError::Parse(e) => write!(f, "catalog parse error: {e}"),
        }
    }
}
impl std::error::Error for CatalogError {}

#[derive(Deserialize)]
struct RawCatalog {
    schema_version: u32,
    game: String,
    #[serde(default)]
    cards: std::collections::BTreeMap<String, RawCard>,
}

#[derive(Deserialize)]
struct RawCard {
    asset_id: u32,
    #[serde(default)]
    version: u8,
    /// Absent in a base-only catalog → default 1 (rare), preserving prior wire
    /// behaviour; the production catalog carries the observed value.
    #[serde(default = "default_rareflag")]
    rareflag: i64,
    /// Content class token ("player"|"consumable"|"staff"). Absent → default
    /// (empty) → [`ContentKind::Player`], so existing player-only catalogs load
    /// unchanged.
    #[serde(default)]
    kind: String,
    /// FIFA `cardsubtypeid` for a non-player entry; absent → `0`.
    #[serde(default)]
    subtype: i64,
    /// Separate card-art id for non-player definitions; absent → `asset_id`.
    #[serde(default)]
    card_asset_id: Option<u32>,
    /// Source team id for a kit or manager definition; absent → `0`.
    #[serde(default)]
    team_id: Option<i64>,
    /// Manager chemistry nation; absent → `0`.
    #[serde(default)]
    nation: Option<i64>,
    /// Manager chemistry league; absent → `0`.
    #[serde(default)]
    league_id: Option<i64>,
    /// EA-authored rating for a non-player definition; absent → Core's rating.
    #[serde(default)]
    rating: Option<u8>,
    /// Consumable bonus magnitude (atom 0x1b); absent → key omitted.
    #[serde(default)]
    amount: Option<i64>,
    /// Contract-card grant (atom 0xb8); absent → key omitted.
    #[serde(default)]
    contract: Option<i64>,
}

fn default_rareflag() -> i64 {
    1
}

/// A loaded, validated FIFA 17 card-definition identity catalog.
#[derive(Debug, Default, Clone)]
pub struct Fifa17CardCatalog {
    by_card: HashMap<String, Fifa17CardIdentity>,
    /// Reverse index: full versioned `resource_id` → the card definition id. The
    /// wire carries a `resourceId`; the synthetic market must mint the
    /// authoritative Core `card_id`, never the raw FIFA number.
    by_resource: HashMap<u32, String>,
}

impl Fifa17CardCatalog {
    /// Parse + validate a catalog document. Rejects wrong schema/game, an
    /// asset id that would overflow into the version byte, and two card ids
    /// claiming the same `resource_id` (a semantic-vs-FIFA identity conflict).
    pub fn from_json_str(s: &str) -> Result<Self, CatalogError> {
        let raw: RawCatalog =
            serde_json::from_str(s).map_err(|e| CatalogError::Parse(e.to_string()))?;
        if raw.schema_version != SCHEMA_VERSION {
            return Err(CatalogError::BadSchemaVersion(raw.schema_version));
        }
        if raw.game != Fifa17WireItemIdPolicy::GAME {
            return Err(CatalogError::WrongGame(raw.game));
        }
        let mut by_card = HashMap::new();
        let mut by_resource: HashMap<u32, String> = HashMap::new();
        for (card_id, rc) in raw.cards {
            if rc.asset_id > MAX_ASSET_ID {
                return Err(CatalogError::AssetTooLarge {
                    card_id,
                    asset_id: rc.asset_id,
                });
            }
            let resource_id = ((rc.version as u32) << 24) | rc.asset_id;
            if let Some(first) = by_resource.get(&resource_id) {
                return Err(CatalogError::DuplicateResource {
                    resource_id,
                    first: first.clone(),
                    second: card_id,
                });
            }
            by_resource.insert(resource_id, card_id.clone());
            by_card.insert(
                card_id,
                Fifa17CardIdentity {
                    asset_id: rc.asset_id,
                    version: rc.version,
                    resource_id,
                    rareflag: rc.rareflag,
                    kind: ContentKind::from_str(&rc.kind),
                    subtype: rc.subtype,
                    card_asset_id: rc.card_asset_id.unwrap_or(rc.asset_id),
                    team_id: rc.team_id.unwrap_or(0),
                    nation: rc.nation.unwrap_or(0),
                    league_id: rc.league_id.unwrap_or(0),
                    rating: rc.rating,
                    amount: rc.amount,
                    contract: rc.contract,
                },
            );
        }
        Ok(Fifa17CardCatalog {
            by_card,
            by_resource,
        })
    }

    /// Load a catalog from a JSON file.
    pub fn from_file(path: &std::path::Path) -> Result<Self, CatalogError> {
        let raw = std::fs::read_to_string(path)
            .map_err(|e| CatalogError::Parse(format!("reading {}: {e}", path.display())))?;
        Self::from_json_str(&raw)
    }

    /// The FIFA 17 identity for a definition, or `None` (never a fabricated id).
    pub fn lookup(&self, card_id: &str) -> Option<Fifa17CardIdentity> {
        self.by_card.get(card_id).copied()
    }

    /// Reverse a FIFA wire `resource_id` (full versioned id) to its authoritative
    /// Core `card_id`, or `None` (never a fabricated/heuristic id). Used by the
    /// synthetic transfer market so a purchase mints real Core content.
    pub fn card_id_for_resource(&self, resource_id: u32) -> Option<&str> {
        self.by_resource.get(&resource_id).map(String::as_str)
    }

    /// Classify a `card_id` as player/consumable/staff. An unknown definition is
    /// [`ContentKind::Player`] — the neutral, backward-compatible default (an
    /// un-catalogued id was always treated as a player-shaped card).
    pub fn kind_of(&self, card_id: &str) -> ContentKind {
        self.by_card
            .get(card_id)
            .map(|c| c.kind)
            .unwrap_or(ContentKind::Player)
    }

    /// The FIFA `cardsubtypeid` for a definition, or `0` if unknown / a player.
    pub fn subtype_of(&self, card_id: &str) -> i64 {
        self.by_card.get(card_id).map(|c| c.subtype).unwrap_or(0)
    }

    pub fn len(&self) -> usize {
        self.by_card.len()
    }
    pub fn is_empty(&self) -> bool {
        self.by_card.is_empty()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn resource_id_composition_base_and_special() {
        let cat = Fifa17CardCatalog::from_json_str(
            r#"{"schema_version":1,"game":"fifa17","cards":{
                "card_base":{"asset_id":20801},
                "card_totw":{"asset_id":20801,"version":3}
            }}"#,
        )
        .unwrap();
        // version 0 -> resource_id == asset_id
        let base = cat.lookup("card_base").unwrap();
        assert_eq!(base.version, 0);
        assert_eq!(base.resource_id, 20801);
        assert_eq!(base.resource_id, base.asset_id);
        // version 3 -> high byte set; same base player, different FIFA card
        let totw = cat.lookup("card_totw").unwrap();
        assert_eq!(totw.asset_id, 20801, "asset_id (base player) unchanged");
        assert_eq!(totw.resource_id, (3u32 << 24) | 20801);
        assert_ne!(base.resource_id, totw.resource_id);
    }

    #[test]
    fn unknown_card_is_none() {
        let cat = Fifa17CardCatalog::from_json_str(
            r#"{"schema_version":1,"game":"fifa17","cards":{"card_base":{"asset_id":1}}}"#,
        )
        .unwrap();
        assert_eq!(cat.lookup("card_missing"), None);
    }

    /// The non-player definition fields a consumable needs, and the ABSENCE that
    /// must stay an absence: a defaulted `amount` would draw "-1" on the card and
    /// a defaulted `contract` would invent the number of matches a card grants.
    #[test]
    fn consumable_definition_fields_are_carried_and_never_defaulted() {
        let cat = Fifa17CardCatalog::from_json_str(
            r#"{"schema_version":1,"game":"fifa17","cards":{
                "fifa17_5003012":{"asset_id":5003012,"kind":"consumable","subtype":54,
                    "card_asset_id":3,"rareflag":0,"rating":85,"amount":15},
                "fifa17_5001004":{"asset_id":5001004,"kind":"consumable","subtype":201,
                    "card_asset_id":7,"rareflag":0,"rating":60,"contract":7},
                "fifa17_5003059":{"asset_id":5003059,"kind":"consumable","subtype":91,
                    "card_asset_id":34,"rareflag":0,"rating":95},
                "fifa17_20801":{"asset_id":20801}
            }}"#,
        )
        .unwrap();
        // A training card: art id 3 (NOT the carddbid), EA's rating, amount 15.
        let training = cat.lookup("fifa17_5003012").unwrap();
        assert_eq!(training.kind, ContentKind::Consumable);
        assert_eq!(training.subtype, 54);
        assert_eq!(training.card_asset_id, 3);
        assert_eq!(training.rating, Some(85));
        assert_eq!(training.amount, Some(15));
        assert_eq!(training.contract, None);
        // A contract card takes its number from `contract`, not `amount`.
        let contract = cat.lookup("fifa17_5001004").unwrap();
        assert_eq!(contract.contract, Some(7));
        assert_eq!(contract.amount, None);
        // A position modifier needs neither.
        let position = cat.lookup("fifa17_5003059").unwrap();
        assert_eq!(position.amount, None);
        assert_eq!(position.contract, None);
        assert_eq!(position.card_asset_id, 34);
        // A player carries none of them and keeps Core's authoritative rating.
        let player = cat.lookup("fifa17_20801").unwrap();
        assert_eq!(player.kind, ContentKind::Player);
        assert_eq!(player.rating, None);
        assert_eq!(player.amount, None);
        assert_eq!(player.contract, None);
        assert_eq!(
            player.card_asset_id, player.asset_id,
            "a player's card art IS its asset id"
        );
    }

    #[test]
    fn two_cards_same_resource_is_a_conflict() {
        let err = Fifa17CardCatalog::from_json_str(
            r#"{"schema_version":1,"game":"fifa17","cards":{
                "card_a":{"asset_id":20801},
                "card_b":{"asset_id":20801}
            }}"#,
        )
        .unwrap_err();
        assert!(matches!(
            err,
            CatalogError::DuplicateResource {
                resource_id: 20801,
                ..
            }
        ));
    }

    #[test]
    fn schema_and_game_are_validated() {
        assert_eq!(
            Fifa17CardCatalog::from_json_str(r#"{"schema_version":2,"game":"fifa17","cards":{}}"#)
                .unwrap_err(),
            CatalogError::BadSchemaVersion(2)
        );
        assert_eq!(
            Fifa17CardCatalog::from_json_str(r#"{"schema_version":1,"game":"fifa23","cards":{}}"#)
                .unwrap_err(),
            CatalogError::WrongGame("fifa23".into())
        );
    }

    #[test]
    fn asset_exceeding_24_bits_is_rejected() {
        let err = Fifa17CardCatalog::from_json_str(
            r#"{"schema_version":1,"game":"fifa17","cards":{"c":{"asset_id":16777216}}}"#,
        )
        .unwrap_err();
        assert!(matches!(
            err,
            CatalogError::AssetTooLarge {
                asset_id: 16_777_216,
                ..
            }
        ));
    }

    #[test]
    fn malformed_json_is_a_parse_error() {
        assert!(matches!(
            Fifa17CardCatalog::from_json_str("{not json").unwrap_err(),
            CatalogError::Parse(_)
        ));
    }

    #[test]
    fn deterministic_reload() {
        let doc = r#"{"schema_version":1,"game":"fifa17","cards":{"a":{"asset_id":10},"b":{"asset_id":20,"version":1}}}"#;
        let c1 = Fifa17CardCatalog::from_json_str(doc).unwrap();
        let c2 = Fifa17CardCatalog::from_json_str(doc).unwrap();
        assert_eq!(c1.lookup("a"), c2.lookup("a"));
        assert_eq!(c1.lookup("b"), c2.lookup("b"));
        assert_eq!(c1.len(), 2);
    }

    #[test]
    fn wire_id_policy_constants() {
        assert_eq!(Fifa17WireItemIdPolicy::GAME, "fifa17");
        assert_eq!(Fifa17WireItemIdPolicy::OWNED_ITEM_KIND, "owned-item");
        assert_eq!(Fifa17WireItemIdPolicy::owned_item_base_floor(), 100_000_001);
    }

    #[test]
    fn loads_the_committed_generated_catalog() {
        // The generated base-card catalog (scripts/seed_fifa17_cards.py) must be
        // loadable by this adapter and carry real asset identities.
        let path = std::path::Path::new(env!("CARGO_MANIFEST_DIR"))
            .join("data/fifa17-card-identities.json");
        if !path.exists() {
            eprintln!("skip: {} not generated", path.display());
            return;
        }
        let cat = Fifa17CardCatalog::from_file(&path).expect("load committed catalog");
        assert!(
            cat.len() > 17_000,
            "full FIFA17 base pool, got {}",
            cat.len()
        );
        // Ronaldo (asset 20801), version 0 => resource_id == asset_id.
        let ron = cat
            .lookup("fifa17_20801")
            .expect("known base asset present");
        assert_eq!(ron.asset_id, 20801);
        assert_eq!(ron.version, 0);
        assert_eq!(ron.resource_id, 20801);
    }

    #[test]
    fn legacy_catalog_without_kind_loads_as_player() {
        // A pre-taxonomy catalog (no `kind`/`subtype`) must load unchanged and
        // classify every entry as a player, with subtype 0.
        let cat = Fifa17CardCatalog::from_json_str(
            r#"{"schema_version":1,"game":"fifa17","cards":{
                "fifa17_20801":{"asset_id":20801},
                "fifa17_176580":{"asset_id":176580,"version":5,"rareflag":3}
            }}"#,
        )
        .unwrap();
        let base = cat.lookup("fifa17_20801").unwrap();
        assert_eq!(base.kind, ContentKind::Player);
        assert_eq!(base.subtype, 0);
        assert_eq!(base.rareflag, 1, "absent rareflag still defaults to 1");
        assert_eq!(cat.kind_of("fifa17_20801"), ContentKind::Player);
        assert_eq!(cat.kind_of("fifa17_176580"), ContentKind::Player);
        // Unknown id -> neutral Player default.
        assert_eq!(cat.kind_of("fifa17_missing"), ContentKind::Player);
        assert_eq!(cat.subtype_of("fifa17_missing"), 0);
    }

    #[test]
    fn kind_and_subtype_are_parsed_for_non_player_entries() {
        let cat = Fifa17CardCatalog::from_json_str(
            r#"{"schema_version":1,"game":"fifa17","cards":{
                "fifa17_20801":{"asset_id":20801,"kind":"player","subtype":0},
                "fifa17_5003012":{"asset_id":5003012,"kind":"consumable","subtype":54,"rareflag":0},
                "fifa17_3000083":{"asset_id":3000083,"kind":"staff","subtype":8,"rareflag":0},
                "fifa17_6300006":{"asset_id":6300006,"kind":"kit","subtype":9,
                    "card_asset_id":35,"team_id":21,"rareflag":0}
            }}"#,
        )
        .unwrap();
        assert_eq!(cat.kind_of("fifa17_20801"), ContentKind::Player);
        assert_eq!(cat.kind_of("fifa17_5003012"), ContentKind::Consumable);
        assert_eq!(cat.subtype_of("fifa17_5003012"), 54);
        assert_eq!(cat.kind_of("fifa17_3000083"), ContentKind::Staff);
        assert_eq!(cat.subtype_of("fifa17_3000083"), 8);
        assert_eq!(cat.lookup("fifa17_5003012").unwrap().rareflag, 0);
        let kit = cat.lookup("fifa17_6300006").unwrap();
        assert_eq!(kit.kind, ContentKind::Kit);
        assert_eq!(kit.subtype, 9);
        assert_eq!(kit.card_asset_id, 35);
        assert_eq!(kit.team_id, 21);
    }
}