import { pool } from "./pools.js";
import { loadConfigFile, getConfig } from "../configLoader.js";
import { computeWorldSeedState } from "../worldSeed.js";

let lastSeedSlot = null;

// ── Schema ────────────────────────────────────────────────────────────────────

export async function initGameSchema() {
  await pool.query(`
    CREATE TABLE IF NOT EXISTS grid_cells (
      id SERIAL PRIMARY KEY,
      world_seed TEXT NOT NULL,
      x SMALLINT NOT NULL CHECK (x >= 0 AND x < 100),
      y SMALLINT NOT NULL CHECK (y >= 0 AND y < 100),
      exploitable BOOLEAN NOT NULL,
      has_planet BOOLEAN NOT NULL,
      planet_json JSONB,
      created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
      UNIQUE (world_seed, x, y)
    );
    CREATE INDEX IF NOT EXISTS idx_grid_cells_seed ON grid_cells (world_seed);
  `);
  await pool.query(`
    CREATE TABLE IF NOT EXISTS team_cooldowns (
      world_seed TEXT NOT NULL,
      team TEXT NOT NULL CHECK (team IN ('blue', 'red')),
      last_reveal TIMESTAMPTZ,
      PRIMARY KEY (world_seed, team)
    );
  `);
  await pool.query(`
    CREATE TABLE IF NOT EXISTS team_econ_scores (
      world_seed TEXT NOT NULL,
      team TEXT NOT NULL CHECK (team IN ('blue', 'red')),
      score DOUBLE PRECISION NOT NULL DEFAULT 0,
      PRIMARY KEY (world_seed, team)
    );
  `);
  await pool.query(`
    CREATE TABLE IF NOT EXISTS team_element_bonus (
      world_seed TEXT NOT NULL,
      team TEXT NOT NULL CHECK (team IN ('blue', 'red')),
      bonus DOUBLE PRECISION NOT NULL DEFAULT 0,
      PRIMARY KEY (world_seed, team)
    );
  `);
  await pool.query(`
    CREATE TABLE IF NOT EXISTS db_metadata (
      id SERIAL PRIMARY KEY,
      created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
    );
    INSERT INTO db_metadata (created_at)
    SELECT NOW() WHERE NOT EXISTS (SELECT 1 FROM db_metadata);
  `);
  await pool.query(`
    CREATE TABLE IF NOT EXISTS victory_points (
      id SERIAL PRIMARY KEY,
      awarded_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
      world_seed TEXT NOT NULL,
      team TEXT NOT NULL CHECK (team IN ('blue', 'red'))
    );
    CREATE INDEX IF NOT EXISTS idx_vp_team ON victory_points (team);
  `);
  await pool.query(`
    ALTER TABLE grid_cells ADD COLUMN IF NOT EXISTS discovered_by TEXT;
    UPDATE grid_cells SET discovered_by = 'blue' WHERE discovered_by IS NULL;
    ALTER TABLE grid_cells ALTER COLUMN discovered_by SET DEFAULT 'blue';
    DO $$
    BEGIN
      IF NOT EXISTS (
        SELECT 1 FROM pg_constraint WHERE conname = 'grid_cells_discovered_by_check'
      ) THEN
        ALTER TABLE grid_cells ADD CONSTRAINT grid_cells_discovered_by_check
          CHECK (discovered_by IN ('blue', 'red'));
      END IF;
    END $$;
    ALTER TABLE grid_cells ALTER COLUMN discovered_by SET NOT NULL;
  `);
}

// ── World-seed epoch ──────────────────────────────────────────────────────────

export async function ensureSeedEpoch() {
  loadConfigFile();
  const rot = getConfig().databaseWipeoutIntervalSeconds;
  const { seedSlot, worldSeed } = computeWorldSeedState(rot);
  if (lastSeedSlot === null) {
    lastSeedSlot = seedSlot;
    return worldSeed;
  }
  if (seedSlot !== lastSeedSlot) {
    // Award a victory point to the team with the highest econ score before wiping
    try {
      const expiredSeed = `swg-${lastSeedSlot}`;
      const econRows = await pool.query(
        `SELECT team, score FROM team_econ_scores WHERE world_seed = $1`,
        [expiredSeed]
      );
      const scores = { blue: 0, red: 0 };
      for (const row of econRows.rows) scores[row.team] = Number(row.score);
      if (scores.blue > 0 || scores.red > 0) {
        const winner = scores.blue >= scores.red ? "blue" : "red";
        await pool.query(
          `INSERT INTO victory_points (world_seed, team) VALUES ($1, $2)`,
          [expiredSeed, winner]
        );
        console.log(`[world] VP awarded to ${winner} for seed ${expiredSeed} (blue=${scores.blue.toFixed(3)}, red=${scores.red.toFixed(3)})`);
      }
    } catch (e) {
      console.error("[world] VP award error:", e);
    }
    await pool.query("TRUNCATE grid_cells RESTART IDENTITY");
    await pool.query("DELETE FROM team_cooldowns WHERE world_seed != $1", [worldSeed]);
    await pool.query("DELETE FROM team_econ_scores WHERE world_seed != $1", [worldSeed]);
    await pool.query("DELETE FROM team_element_bonus WHERE world_seed != $1", [worldSeed]);
    console.log(`[world] Slot ${lastSeedSlot} → ${seedSlot}; grid wiped, old cooldowns cleared.`);
    lastSeedSlot = seedSlot;
  }
  return worldSeed;
}

// ── Grid cells ────────────────────────────────────────────────────────────────

export async function getGridCells(worldSeed) {
  const { rows } = await pool.query(
    `SELECT x, y, exploitable, has_planet, planet_json, discovered_by
     FROM grid_cells WHERE world_seed = $1`,
    [worldSeed]
  );
  return rows;
}

export async function insertCell(seed, x, y, exploitable, hasPlanet, planetJson, team) {
  const { rows } = await pool.query(
    `INSERT INTO grid_cells (world_seed, x, y, exploitable, has_planet, planet_json, discovered_by)
     VALUES ($1, $2, $3, $4, $5, $6, $7)
     ON CONFLICT (world_seed, x, y) DO NOTHING
     RETURNING x, y, exploitable, has_planet, planet_json, discovered_by`,
    [seed, x, y, exploitable, hasPlanet, planetJson, team]
  );
  return rows[0] ?? null;
}

export async function getExistingCell(seed, x, y) {
  const { rows } = await pool.query(
    `SELECT x, y, exploitable, has_planet, planet_json, discovered_by
     FROM grid_cells WHERE world_seed = $1 AND x = $2 AND y = $3`,
    [seed, x, y]
  );
  return rows[0] ?? null;
}

// ── Team cooldowns ────────────────────────────────────────────────────────────

export async function getTeamCooldown(worldSeed, team) {
  const { rows } = await pool.query(
    `SELECT last_reveal FROM team_cooldowns WHERE world_seed = $1 AND team = $2`,
    [worldSeed, team]
  );
  return rows[0] ?? null;
}

export async function upsertTeamCooldown(worldSeed, team) {
  await pool.query(
    `INSERT INTO team_cooldowns (world_seed, team, last_reveal)
     VALUES ($1, $2, NOW())
     ON CONFLICT (world_seed, team) DO UPDATE SET last_reveal = NOW()`,
    [worldSeed, team]
  );
}

// ── Economic scores ───────────────────────────────────────────────────────────

export async function getEconScores(worldSeed) {
  const { rows } = await pool.query(
    `SELECT team, score FROM team_econ_scores WHERE world_seed = $1`,
    [worldSeed]
  );
  const result = { blue: 0, red: 0 };
  for (const row of rows) result[row.team] = Number(row.score);
  return result;
}

export async function addEconScore(worldSeed, team, delta) {
  if (delta <= 0) return;
  await pool.query(
    `INSERT INTO team_econ_scores (world_seed, team, score)
     VALUES ($1, $2, $3)
     ON CONFLICT (world_seed, team) DO UPDATE
       SET score = team_econ_scores.score + EXCLUDED.score`,
    [worldSeed, team, delta]
  );
}

export async function getElementBonus(worldSeed) {
  const { rows } = await pool.query(
    `SELECT team, bonus FROM team_element_bonus WHERE world_seed = $1`,
    [worldSeed]
  );
  const result = { blue: 0, red: 0 };
  for (const row of rows) result[row.team] = Number(row.bonus);
  return result;
}

export async function setElementBonus(worldSeed, team, bonus) {
  await pool.query(
    `INSERT INTO team_element_bonus (world_seed, team, bonus)
     VALUES ($1, $2, $3)
     ON CONFLICT (world_seed, team) DO UPDATE
       SET bonus = EXCLUDED.bonus`,
    [worldSeed, team, bonus]
  );
}

// ── DB metadata ───────────────────────────────────────────────────────────────

export async function getDbCreatedAt() {
  const { rows } = await pool.query(
    `SELECT created_at FROM db_metadata ORDER BY id ASC LIMIT 1`
  );
  return rows[0]?.created_at ?? null;
}

// ── Victory points ────────────────────────────────────────────────────────────

export async function getVictoryPoints() {
  const { rows } = await pool.query(
    `SELECT team, COUNT(*) AS cnt FROM victory_points GROUP BY team`
  );
  const result = { blue: 0, red: 0 };
  for (const row of rows) result[row.team] = Number(row.cnt);
  return result;
}

// ── Scores ────────────────────────────────────────────────────────────────────

export async function getScores(worldSeed) {
  const { rows } = await pool.query(
    `SELECT discovered_by, COUNT(*) AS cnt
     FROM grid_cells WHERE world_seed = $1
     GROUP BY discovered_by`,
    [worldSeed]
  );
  return rows;
}