use crate::{
    db::Pool,
    error::AppResult,
    models::{card::Quality, club::Club, pack::PackDefinition},
    services::{card_db::CardDb, club as club_svc, pack as pack_svc, profile as profile_svc},
};
use serde::Serialize;
use std::collections::BTreeMap;
use tracing::info;

/// The game whose dev content + inventory this seeds.
pub const FIFA17_GAME: &str = "fifa17";
/// Deterministic owned-instance id prefix, so re-running the seed is idempotent
/// (INSERT OR IGNORE on a stable id) rather than minting duplicate ownership.
const DEV_OWNED_PREFIX: &str = "fdev-";
/// Fixed grant timestamp — the seed is deterministic, not wall-clock dependent.
const DEV_ACQUIRED_AT: &str = "2026-08-11T00:00:00Z";
/// The client's My Squad page size (evidence: request `count=11`).
const MY_SQUAD_PAGE: usize = 11;

/// Seeds the market with NPC listings if empty.
pub async fn maybe_seed(_pool: &Pool) -> AppResult<()> {
    // Any one-time startup seeds go here.
    // Currently we just ensure the market gets listings on first run.
    Ok(())
}

/// Grants the starter pack to a newly created club.
pub async fn grant_starter_pack(
    pool: &Pool,
    club_id: &str,
    pack_defs: &[PackDefinition],
) -> AppResult<()> {
    // Look for the gold starter pack first; fall back to the first available definition.
    let starter_def = pack_defs
        .iter()
        .find(|p| p.id == "gold_pack")
        .or_else(|| pack_defs.first());

    if let Some(def) = starter_def {
        info!("Granting starter pack '{}' to club {}", def.id, club_id);
        pack_svc::grant_pack(pool, club_id, &def.id).await?;
    } else {
        tracing::warn!("No pack definitions loaded; skipping starter pack grant");
    }

    Ok(())
}

// ───────────────────────────── FIFA 17 dev seed ─────────────────────────────

/// Coverage of the seeded FIFA 17 development inventory. Game-independent: it
/// counts quality tiers, positions and distinct entities, and whether the Gold
/// filter spans more than one page — everything the retail `/club` UI must
/// exercise. It carries NO FIFA wire ids (those are the adapter/host's runtime
/// concern; the seed never allocates them).
#[derive(Debug, Serialize)]
pub struct DevSeedReport {
    pub game_id: String,
    /// True if the fifa17 club already owned dev cards (no new grants made).
    pub already_seeded: bool,
    pub definitions_available: usize,
    pub owned_total: usize,
    pub unique_definitions: usize,
    pub gold: usize,
    pub silver: usize,
    pub bronze: usize,
    pub positions: BTreeMap<String, usize>,
    pub distinct_nations: usize,
    pub distinct_leagues: usize,
    pub distinct_clubs: usize,
    pub max_same_club: usize,
    /// Gold owned items exceed one page → the client must request a 2nd page.
    pub gold_over_one_page: bool,
}

/// Opt-in development seed: create (if absent) a `game_id=fifa17` profile + club
/// and grant Core-owned instances of every dev-pack `CardDefinition` (ids
/// `fifa17_*`), plus one deliberate duplicate of a single definition (to exercise
/// two-copies-of-one-card identity later).
///
/// **Ownership only — no FIFA wire ids.** The FIFA 17 integer item id is minted
/// lazily by `Fifa17IdentityResolver` at request time, never here. This keeps the
/// boundary clean: Core owns "this profile owns this card"; the adapter owns
/// "this owned item is wire id N".
///
/// Idempotent: owned ids are deterministic (`fdev-<card_id>`), inserted with
/// `INSERT OR IGNORE`, so re-running grants nothing new. The default profile
/// (`fifa23`/no-header) and any existing synthetic inventory are never touched.
pub async fn seed_fifa17_dev(pool: &Pool, card_db: &CardDb) -> AppResult<DevSeedReport> {
    // The dev definitions are exactly the game-namespaced ids in the catalog.
    let mut defs: Vec<&crate::models::card::CardDefinition> = card_db
        .cards
        .values()
        .filter(|c| c.id.starts_with("fifa17_"))
        .collect();
    defs.sort_by(|a, b| a.id.cmp(&b.id));

    // Ensure the fifa17-scoped profile + club exist (single-profile-per-game).
    let profile = match profile_svc::get_active_profile(pool, FIFA17_GAME).await {
        Ok(p) => p,
        Err(_) => profile_svc::create_profile(pool, "OpenFUT Dev (FIFA17)", FIFA17_GAME).await?,
    };
    let club = match club_svc::get_club_by_profile(pool, &profile.id).await {
        Ok(c) => c,
        Err(_) => {
            let c = Club::new(&profile.id, "OpenFUT Dev FC", 100_000);
            club_svc::create_club(pool, &c).await?;
            c
        }
    };

    let prior: i64 = sqlx::query_scalar(
        "SELECT COUNT(*) FROM owned_cards WHERE club_id = ? AND card_id LIKE 'fifa17_%'",
    )
    .bind(&club.id)
    .fetch_one(pool)
    .await?;
    let already_seeded = prior > 0;

    // Grant one instance per definition; INSERT OR IGNORE keeps reruns idempotent.
    for def in &defs {
        grant_owned(
            pool,
            &format!("{DEV_OWNED_PREFIX}{}", def.id),
            &club.id,
            &def.id,
        )
        .await?;
    }
    // One deliberate duplicate of the first (lexicographic) definition → two
    // owned copies of one card sharing a definition but distinct owned ids.
    if let Some(first) = defs.first() {
        grant_owned(
            pool,
            &format!("{DEV_OWNED_PREFIX}{}-b", first.id),
            &club.id,
            &first.id,
        )
        .await?;
    }

    let report = dev_coverage(pool, card_db, &club.id, already_seeded, defs.len()).await?;
    info!(
        "seeded fifa17 dev inventory: {} owned ({} gold) over club {}",
        report.owned_total, report.gold, club.id
    );
    Ok(report)
}

async fn grant_owned(pool: &Pool, owned_id: &str, club_id: &str, card_id: &str) -> AppResult<()> {
    sqlx::query(
        "INSERT OR IGNORE INTO owned_cards \
         (id, club_id, card_id, is_loan, loan_matches_remaining, acquired_at) \
         VALUES (?, ?, ?, 0, NULL, ?)",
    )
    .bind(owned_id)
    .bind(club_id)
    .bind(card_id)
    .bind(DEV_ACQUIRED_AT)
    .execute(pool)
    .await?;
    Ok(())
}

/// Build the coverage report from the club's owned dev cards joined to `card_db`.
async fn dev_coverage(
    pool: &Pool,
    card_db: &CardDb,
    club_id: &str,
    already_seeded: bool,
    definitions_available: usize,
) -> AppResult<DevSeedReport> {
    let card_ids: Vec<String> = sqlx::query_scalar(
        "SELECT card_id FROM owned_cards WHERE club_id = ? AND card_id LIKE 'fifa17_%'",
    )
    .bind(club_id)
    .fetch_all(pool)
    .await?;
    let (mut gold, mut silver, mut bronze) = (0usize, 0usize, 0usize);
    let mut positions: BTreeMap<String, usize> = BTreeMap::new();
    let mut nations = std::collections::BTreeSet::new();
    let mut leagues = std::collections::BTreeSet::new();
    let mut club_counts: BTreeMap<String, usize> = BTreeMap::new();
    let mut unique = std::collections::BTreeSet::new();
    for card_id in &card_ids {
        unique.insert(card_id.clone());
        if let Some(def) = card_db.get(card_id) {
            match Quality::from_overall(def.overall) {
                Quality::Gold => gold += 1,
                Quality::Silver => silver += 1,
                Quality::Bronze => bronze += 1,
            }
            *positions.entry(def.position.clone()).or_default() += 1;
            nations.insert(def.nation.clone());
            leagues.insert(def.league.clone());
            *club_counts.entry(def.club.clone()).or_default() += 1;
        }
    }
    Ok(DevSeedReport {
        game_id: FIFA17_GAME.to_string(),
        already_seeded,
        definitions_available,
        owned_total: card_ids.len(),
        unique_definitions: unique.len(),
        gold,
        silver,
        bronze,
        positions,
        distinct_nations: nations.len(),
        distinct_leagues: leagues.len(),
        distinct_clubs: club_counts.len(),
        max_same_club: club_counts.values().copied().max().unwrap_or(0),
        gold_over_one_page: gold > MY_SQUAD_PAGE,
    })
}