import express from "express";
import jwt from "jsonwebtoken";
import { getConfig } from "../configLoader.js";
import { computeWorldSeedState } from "../worldSeed.js";
import { authMiddleware, JWT_SECRET } from "../middleware/auth.js";
import {
  ensureSeedEpoch,
  getGridCells,
  insertCell,
  getExistingCell,
  getTeamCooldown,
  getUserCooldown,
  upsertUserCooldown,
  getScores,
  getEconScores,
  addEconScore,
  getElementBonus,
  setElementBonus,
  getDbCreatedAt,
  getVictoryPoints,
  getActivePlayerCounts,
  getMilitaryDeductions,
  addMilitaryDeduction,
  recordCellAttack,
  getCellAttackCount,
  setTileOwner,
  getTeamActionsRow,
  resetTeamActions,
  decrementTeamActions,
} from "../db/gameDb.js";
import {
  nextNoonUtc,
  getUserActionsRow,
  resetUserActions,
  decrementUserActions,
} from "../db/usersDb.js";
import { computeCell, rowToCellPayload } from "../helpers/cell.js";
import { computeTeamMilitaryPower } from "../helpers/economy.js";

const router = express.Router();

// GET /api/config
router.get("/config", async (req, res) => {
  try {
    const worldSeed = await ensureSeedEpoch();
    const cfg = getConfig();
    const rot = cfg.databaseWipeoutIntervalSeconds;
    const ws = computeWorldSeedState(rot);

    let actionsRemaining = null;
    let teamActionsRemaining = null;
    const team = typeof req.query.team === "string" ? req.query.team : undefined;
    if (team === "blue" || team === "red") {
      const authHeader = req.headers["authorization"];
      if (authHeader && authHeader.startsWith("Bearer ")) {
        try {
          const payload = jwt.verify(authHeader.slice(7), JWT_SECRET);
          const bonus = await getElementBonus(worldSeed);
          const teamBonus = bonus[team] ?? 0;
          const effectiveQuota = Math.floor(cfg.dailyActionQuota * (1 + teamBonus / 100));
          const now = new Date();
          const quotaRow = await getUserActionsRow(payload.userId);
          if (!quotaRow || new Date(quotaRow.quota_reset_at) <= now) {
            actionsRemaining = effectiveQuota;
          } else {
            actionsRemaining = quotaRow.actions_remaining;
          }
        } catch { /* invalid token — return null */ }
      }

      // Team-wide quota: compute current remaining without consuming
      const now = new Date();
      const teamRow = await getTeamActionsRow(team);
      if (!teamRow || new Date(teamRow.quota_reset_at) <= now) {
        // Expired or unset: compute what it would be when refreshed
        const rows = await getGridCells(worldSeed);
        const milPower = computeTeamMilitaryPower(team, rows, cfg.militaryPower ?? {});
        const milDeductions = await getMilitaryDeductions(worldSeed);
        const milNet = milPower - (milDeductions[team] ?? 0);
        const milBonus = Math.floor(Math.max(0, milNet) / 10000);
        teamActionsRemaining = 100 + milBonus;
      } else {
        teamActionsRemaining = teamRow.actions_remaining;
      }
    }

    res.json({
      dailyActionQuota: cfg.dailyActionQuota,
      databaseWipeoutIntervalSeconds: rot,
      debugModeForTeams: cfg.debugModeForTeams,
      configReloadIntervalSeconds: cfg.configReloadIntervalSeconds,
      worldSeed: ws.worldSeed,
      seedPeriodEndsAtUtc: ws.seedPeriodEndsAtUtc,
      seedPeriodStartsAtUtc: ws.seedPeriodStartsAtUtc,
      actionsRemaining,
      teamActionsRemaining,
      resourceWorth: cfg.resourceWorth ?? { common: {}, rare: {} },
      elementWorth: cfg.elementWorth ?? {},
      militaryPower: cfg.militaryPower ?? {},
    });
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "config_error" });
  }
});

// GET /api/grid/:seed
router.get("/grid/:seed", async (req, res) => {
  const seed = decodeURIComponent(req.params.seed || "");
  try {
    const worldSeed = await ensureSeedEpoch();
    if (seed !== worldSeed) {
      return res.status(410).json({
        error: "seed_expired",
        worldSeed,
        seedPeriodEndsAtUtc: computeWorldSeedState(
          getConfig().databaseWipeoutIntervalSeconds
        ).seedPeriodEndsAtUtc,
      });
    }
    const rows = await getGridCells(seed);
    res.json({ seed, cells: rows });
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// POST /api/cell/reveal
router.post("/cell/reveal", authMiddleware, async (req, res) => {
  const seed = String(req.body?.seed ?? "");
  const team = req.user.team;          // taken from verified JWT, not request body
  const userId = req.user.userId;
  const x = Number(req.body?.x);
  const y = Number(req.body?.y);

  if (!seed || !Number.isInteger(x) || !Number.isInteger(y) || x < 0 || x >= 100 || y < 0 || y >= 100) {
    return res.status(400).json({ error: "invalid_body" });
  }

  try {
    const worldSeed = await ensureSeedEpoch();
    if (seed !== worldSeed) {
      return res.status(410).json({ error: "seed_expired", worldSeed });
    }

    const cfg = getConfig();
    if (cfg.dailyActionQuota > 0) {
      const bonus = await getElementBonus(worldSeed);
      const teamBonus = bonus[team] ?? 0;
      const effectiveQuota = Math.floor(cfg.dailyActionQuota * (1 + teamBonus / 100));
      const now = new Date();
      const quotaRow = await getUserActionsRow(userId);

      if (!quotaRow || new Date(quotaRow.quota_reset_at) <= now) {
        // First action of the day (or expired): reset to effectiveQuota - 1 (consuming 1 now)
        await resetUserActions(userId, effectiveQuota - 1, nextNoonUtc().toISOString());
      } else {
        // Quota exists and still valid — try to consume
        const updated = await decrementUserActions(userId);
        if (!updated) {
          return res.status(429).json({
            error: "quota_exhausted",
            actionsRemaining: 0,
          });
        }
      }
    }

    const cell = computeCell(seed, x, y);
    const planetJson = cell.planet ? JSON.stringify(cell.planet) : null;
    const inserted = await insertCell(seed, x, y, cell.exploitable, cell.hasPlanet, planetJson, team);

    // Track activity for active-player count (kept for stat purposes)
    await upsertUserCooldown(worldSeed, userId, team);

    if (inserted) {
      return res.json(rowToCellPayload(inserted));
    }

    const existing = await getExistingCell(seed, x, y);
    if (!existing) return res.status(500).json({ error: "insert_race" });

    if (existing.discovered_by !== team) {
      return res.status(409).json({
        error: "taken_by_other_team",
        discoveredBy: existing.discovered_by,
        cell: rowToCellPayload(existing),
      });
    }
    return res.json(rowToCellPayload(existing));
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// GET /api/team-quota?team=blue|red
router.get("/team-quota", async (req, res) => {
  const team = typeof req.query.team === "string" ? req.query.team : "";
  if (team !== "blue" && team !== "red") {
    return res.status(400).json({ error: "invalid_team" });
  }
  try {
    const worldSeed = await ensureSeedEpoch();
    const cfg = getConfig();
    const now = new Date();
    const teamRow = await getTeamActionsRow(team);
    let actionsRemaining;
    if (!teamRow || new Date(teamRow.quota_reset_at) <= now) {
      const rows = await getGridCells(worldSeed);
      const milPower = computeTeamMilitaryPower(team, rows, cfg.militaryPower ?? {});
      const milDeductions = await getMilitaryDeductions(worldSeed);
      const milNet = milPower - (milDeductions[team] ?? 0);
      const milBonus = Math.floor(Math.max(0, milNet) / 10000);
      actionsRemaining = 100 + milBonus;
    } else {
      actionsRemaining = teamRow.actions_remaining;
    }
    res.json({ team, actionsRemaining });
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// GET /api/econ-scores
router.get("/econ-scores", async (_req, res) => {
  try {
    const worldSeed = await ensureSeedEpoch();
    const scores = await getEconScores(worldSeed);
    res.json(scores);
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// POST /api/econ-scores/tick  body: { seed, blue, red }
router.post("/econ-scores/tick", async (req, res) => {
  const seed  = String(req.body?.seed ?? "");
  const blue  = Number(req.body?.blue ?? 0);
  const red   = Number(req.body?.red  ?? 0);
  try {
    const worldSeed = await ensureSeedEpoch();
    if (seed !== worldSeed) return res.status(410).json({ error: "seed_expired", worldSeed });
    await addEconScore(worldSeed, "blue", blue);
    await addEconScore(worldSeed, "red",  red);
    const scores = await getEconScores(worldSeed);
    res.json(scores);
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// GET /api/element-bonus
router.get("/element-bonus", async (_req, res) => {
  try {
    const worldSeed = await ensureSeedEpoch();
    const bonus = await getElementBonus(worldSeed);
    res.json(bonus);
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// POST /api/element-bonus/tick  body: { seed, blue, red }
router.post("/element-bonus/tick", async (req, res) => {
  const seed = String(req.body?.seed ?? "");
  const blue = Number(req.body?.blue ?? 0);
  const red  = Number(req.body?.red  ?? 0);
  try {
    const worldSeed = await ensureSeedEpoch();
    if (seed !== worldSeed) return res.status(410).json({ error: "seed_expired", worldSeed });
    await setElementBonus(worldSeed, "blue", blue);
    await setElementBonus(worldSeed, "red",  red);
    const bonus = await getElementBonus(worldSeed);
    res.json(bonus);
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// GET /api/db-info
router.get("/db-info", async (_req, res) => {
  try {
    const createdAt = await getDbCreatedAt();
    res.json({ createdAt });
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// GET /api/victory-points
router.get("/victory-points", async (_req, res) => {
  try {
    const vp = await getVictoryPoints();
    res.json(vp);
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// GET /api/active-players
router.get("/active-players", async (_req, res) => {
  try {
    const worldSeed = await ensureSeedEpoch();
    const counts = await getActivePlayerCounts(worldSeed);
    res.json(counts);
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// GET /api/scores
router.get("/scores", async (_req, res) => {
  try {
    const worldSeed = await ensureSeedEpoch();
    const rows = await getScores(worldSeed);
    const scores = { blue: 0, red: 0 };
    for (const row of rows) {
      if (row.discovered_by === "blue") scores.blue = Number(row.cnt);
      if (row.discovered_by === "red") scores.red = Number(row.cnt);
    }
    res.json(scores);
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// GET /api/military-deductions
router.get("/military-deductions", async (_req, res) => {
  try {
    const worldSeed = await ensureSeedEpoch();
    const deductions = await getMilitaryDeductions(worldSeed);
    res.json(deductions);
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// POST /api/military/attack  body: { seed, x, y }
// Requires auth. The attacker's team must have enough computed military power.
// Deducts exactly 1.0 billion (= 1000 M) and logs the attack on the cell.
router.post("/military/attack", authMiddleware, async (req, res) => {
  const seed = String(req.body?.seed ?? "");
  const x    = Number(req.body?.x);
  const y    = Number(req.body?.y);
  const attackingTeam = req.user.team;

  if (!seed || !Number.isInteger(x) || !Number.isInteger(y) || x < 0 || x >= 100 || y < 0 || y >= 100) {
    return res.status(400).json({ error: "invalid_body" });
  }

  try {
    const worldSeed = await ensureSeedEpoch();
    if (seed !== worldSeed) return res.status(410).json({ error: "seed_expired", worldSeed });

    // Target cell must exist and belong to the opposing team
    const existing = await getExistingCell(worldSeed, x, y);
    if (!existing) return res.status(404).json({ error: "cell_not_found" });
    if (existing.discovered_by === attackingTeam) {
      return res.status(409).json({ error: "cannot_attack_own_tile" });
    }

    // Deduct 1 billion (1.0 in "billions" unit) from the attacking team
    const COST_BILLIONS = 1.0;
    await addMilitaryDeduction(worldSeed, attackingTeam, COST_BILLIONS);

    // Transfer tile ownership to the attacking team
    await setTileOwner(worldSeed, x, y, attackingTeam);

    // Record the attack event
    await recordCellAttack(worldSeed, x, y, attackingTeam);

    const deductions  = await getMilitaryDeductions(worldSeed);
    const updatedCell = await getExistingCell(worldSeed, x, y);

    res.json({
      success: true,
      cell: rowToCellPayload(updatedCell),
      deductions,
    });
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

// GET /api/cell/attacks?x=&y=
router.get("/cell/attacks", async (req, res) => {
  const x = Number(req.query.x);
  const y = Number(req.query.y);
  if (!Number.isInteger(x) || !Number.isInteger(y) || x < 0 || x >= 100 || y < 0 || y >= 100) {
    return res.status(400).json({ error: "invalid_params" });
  }
  try {
    const worldSeed = await ensureSeedEpoch();
    const count = await getCellAttackCount(worldSeed, x, y);
    res.json({ x, y, attackCount: count });
  } catch (e) {
    console.error(e);
    res.status(500).json({ error: "database_error" });
  }
});

export default router;