//! Shared domain types used across the core.

use serde::{Deserialize, Serialize};

/// A card's color identity / colors, encoded as a 5-bit WUBRG mask.
///
/// Bit layout (little end first): W=1, U=2, B=4, R=8, G=16.
/// Storing colors this way turns commander color-identity compatibility into a
/// single integer predicate (see [`ColorSet::is_subset_of`]).
pub const W: u8 = 1 << 0;
pub const U: u8 = 1 << 1;
pub const B: u8 = 1 << 2;
pub const R: u8 = 1 << 3;
pub const G: u8 = 1 << 4;

/// The five colors in canonical WUBRG order, paired with their single-letter code.
pub const WUBRG: [(u8, char); 5] = [(W, 'W'), (U, 'U'), (B, 'B'), (R, 'R'), (G, 'G')];

/// A set of colors as a WUBRG bitmask.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Serialize, Deserialize)]
pub struct ColorSet(pub u8);

impl ColorSet {
    pub const COLORLESS: ColorSet = ColorSet(0);

    /// Build from an iterator of single-letter color codes (e.g. Scryfall's
    /// `["B", "G"]`). Unknown letters are ignored.
    pub fn from_letters<I, S>(letters: I) -> Self
    where
        I: IntoIterator<Item = S>,
        S: AsRef<str>,
    {
        let mut mask = 0u8;
        for l in letters {
            match l.as_ref() {
                "W" | "w" => mask |= W,
                "U" | "u" => mask |= U,
                "B" | "b" => mask |= B,
                "R" | "r" => mask |= R,
                "G" | "g" => mask |= G,
                _ => {}
            }
        }
        ColorSet(mask)
    }

    /// Parse from a compact string like "BG" or "wubrg". Order-insensitive.
    pub fn parse(s: &str) -> Self {
        Self::from_letters(s.chars().map(|c| c.to_string()))
    }

    /// Canonical WUBRG string, e.g. `ColorSet(B|G)` -> "BG". Colorless -> "".
    pub fn to_letters(self) -> String {
        WUBRG
            .iter()
            .filter(|(bit, _)| self.0 & bit != 0)
            .map(|(_, ch)| *ch)
            .collect()
    }

    pub fn is_colorless(self) -> bool {
        self.0 == 0
    }

    pub fn contains(self, bit: u8) -> bool {
        self.0 & bit != 0
    }

    /// True if every color in `self` is also in `other`.
    ///
    /// This is the commander-legality rule: a card is playable in a commander of
    /// color identity `C` iff `card_identity.is_subset_of(C)`.
    pub fn is_subset_of(self, other: ColorSet) -> bool {
        self.0 & !other.0 == 0
    }
}

/// A card as returned by search / library queries. Oracle-level (one per
/// `oracle_id`), enriched with the caller's ownership + deck context where relevant.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CardRef {
    pub oracle_id: String,
    pub name: String,
    pub mana_value: f64,
    pub colors: ColorSet,
    pub color_identity: ColorSet,
    pub type_line: String,
    /// URL of a card image (Scryfall "normal" size) for one of its printings,
    /// or empty if none is available.
    pub image_uri: String,
    /// URL of the *back face* image for the same printing (transform / modal
    /// double-faced / reversible cards), or empty for single-faced cards.
    pub back_image_uri: String,
}

/// A library row: a card the user owns, with quantity and its deck memberships.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LibraryCard {
    #[serde(flatten)]
    pub card: CardRef,
    pub quantity_owned: i64,
    /// Names of decks this card is currently assigned to.
    pub decks: Vec<String>,
    /// Total copies assigned across all decks. If it exceeds `quantity_owned`,
    /// the physical copies are over-committed.
    pub quantity_assigned: i64,
    /// Free-text physical storage location (e.g. "Box 1"). Meaningful mainly for
    /// cards not currently in a deck.
    pub location: String,
}

/// A card in a deck, whether or not the user owns it.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DeckEntry {
    #[serde(flatten)]
    pub card: CardRef,
    /// Copies of this card in the deck.
    pub quantity: i64,
    pub is_commander: bool,
    /// Copies owned in the library (0 if the card isn't in the library).
    pub quantity_owned: i64,
}

impl LibraryCard {
    pub fn is_over_assigned(&self) -> bool {
        self.quantity_assigned > self.quantity_owned
    }
}

/// A deck.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Deck {
    pub id: i64,
    pub name: String,
    /// Free-text format, e.g. "Commander", "Modern" (empty if unset).
    pub format: String,
    /// The commander card's oracle id (meaningful for Commander/Brawl formats).
    pub commander_oracle_id: Option<String>,
    pub notes: String,
}

/// Aggregate stats about the owned library, for a dashboard-style summary.
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct LibraryStats {
    /// Distinct oracle cards owned (quantity_owned > 0).
    pub unique_cards: i64,
    /// Total physical copies owned, summed across all cards.
    pub total_copies: i64,
    pub deck_count: i64,
    /// Copies owned in each color, WUBRG order. A multicolor card's copies
    /// count toward every color it contains, so these can sum to more than
    /// `total_copies`.
    pub color_counts: [i64; 5],
    /// Copies owned with no color (colors == 0).
    pub colorless_count: i64,
}

/// Criteria for searching the owned library. All fields are optional; an empty
/// filter matches every owned card.
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
#[serde(default)]
pub struct LibraryFilter {
    /// Fuzzy-ish name text (applied as a case-insensitive substring here; the
    /// fast fuzzy path is [`crate::search`]).
    pub text: Option<String>,
    /// Cards whose `colors` exactly equal this set.
    pub colors_exact: Option<ColorSet>,
    /// Cards whose `colors` include at least these.
    pub colors_include: Option<ColorSet>,
    /// Commander compatibility: only cards whose color identity is a subset of
    /// this set (playable under a commander of this identity).
    pub commander_identity: Option<ColorSet>,
    pub cmc_min: Option<f64>,
    pub cmc_max: Option<f64>,
    /// Card supertype/type, e.g. "Creature", "Instant" (matched against the
    /// normalized `card_types` table).
    pub types: Vec<String>,
    /// Subtype, e.g. "Elf", "Equipment".
    pub subtypes: Vec<String>,
    /// Keyword ability, e.g. "Flying", "Deathtouch".
    pub keywords: Vec<String>,
    /// Restrict to cards assigned to this deck id.
    pub in_deck: Option<i64>,
    /// Case-insensitive substring match against the card's stored location
    /// (e.g. "Box 1"). Cards with no location set never match a non-empty value.
    pub location: Option<String>,
}