import { eq, desc, and, like, gte, lte, or, sql } from "drizzle-orm";
import { drizzle } from "drizzle-orm/mysql2";
import mysql from "mysql2/promise";
import {
  InsertUser,
  users,
  localUsers,
  veilleItems,
  aapItems,
  appSettings,
  importLogs,
  InsertLocalUser,
  ideas,
  InsertIdea,
  rssFeeds,
  rssSettings,
  type InsertRssFeed,
  type InsertRssSettings,
  type RssFeed,
  type RssSettings,
} from "../drizzle/schema";
import { ENV } from "./_core/env";

// eslint-disable-next-line @typescript-eslint/no-explicit-any
let _db: any = null;

export async function getDb() {
  if (!_db && process.env.DATABASE_URL) {
    try {
      const pool = mysql.createPool({
        uri: process.env.DATABASE_URL,
        waitForConnections: true,
        connectionLimit: 10,
        enableKeepAlive: true,
      });
      _db = drizzle(pool);
    } catch (error) {
      console.warn("[Database] Failed to connect:", error);
      _db = null;
    }
  }
  return _db;
}

// ─── Users (Manus OAuth) ─────────────────────────────────────────────────────

export async function upsertUser(user: InsertUser): Promise<void> {
  if (!user.openId) throw new Error("User openId is required for upsert");
  const db = await getDb();
  if (!db) { console.warn("[Database] Cannot upsert user: database not available"); return; }

  const values: InsertUser = { openId: user.openId };
  const updateSet: Record<string, unknown> = {};
  const textFields = ["name", "email", "loginMethod"] as const;

  for (const field of textFields) {
    const value = user[field];
    if (value === undefined) continue;
    const normalized = value ?? null;
    values[field] = normalized;
    updateSet[field] = normalized;
  }

  if (user.lastSignedIn !== undefined) { values.lastSignedIn = user.lastSignedIn; updateSet.lastSignedIn = user.lastSignedIn; }
  if (user.role !== undefined) { values.role = user.role; updateSet.role = user.role; }
  else if (user.openId === ENV.ownerOpenId) { values.role = "admin"; updateSet.role = "admin"; }
  if (!values.lastSignedIn) values.lastSignedIn = new Date();
  if (Object.keys(updateSet).length === 0) updateSet.lastSignedIn = new Date();

  await db.insert(users).values(values).onDuplicateKeyUpdate({ set: updateSet });
}

export async function getUserByOpenId(openId: string) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(users).where(eq(users.openId, openId)).limit(1);
  return result[0];
}

// ─── Local Users ─────────────────────────────────────────────────────────────

export async function getLocalUsers() {
  const db = await getDb();
  if (!db) return [];
  return db
    .select({
      id: localUsers.id,
      name: localUsers.name,
      username: localUsers.username,
      email: localUsers.email,
      role: localUsers.role,
      isActive: localUsers.isActive,
      createdAt: localUsers.createdAt,
      lastSignedIn: localUsers.lastSignedIn,
    })
    .from(localUsers)
    .orderBy(desc(localUsers.createdAt));
}

export async function createLocalUser(data: Omit<InsertLocalUser, "id" | "createdAt" | "updatedAt">) {
  const db = await getDb();
  if (!db) throw new Error("DB unavailable");
  await db.insert(localUsers).values(data);
}

export async function updateLocalUser(id: number, data: Partial<InsertLocalUser>) {
  const db = await getDb();
  if (!db) throw new Error("DB unavailable");
  await db.update(localUsers).set(data).where(eq(localUsers.id, id));
}

export async function deleteLocalUser(id: number) {
  const db = await getDb();
  if (!db) throw new Error("DB unavailable");
  await db.delete(localUsers).where(eq(localUsers.id, id));
}

// ─── Veille Items ─────────────────────────────────────────────────────────────

export interface VeilleFilters {
  typeVeille?: string;
  categorie?: string;
  niveau?: string;
  territoire?: string;
  search?: string;
  dateFrom?: Date;
  dateTo?: Date;
  page?: number;
  pageSize?: number;
}

export async function getVeilleItems(filters: VeilleFilters = {}) {
  const db = await getDb();
  if (!db) return { items: [], total: 0 };

  const { page = 1, pageSize = 50, ...f } = filters;
  const offset = (page - 1) * pageSize;

  const conditions = [];
  if (f.typeVeille) conditions.push(eq(veilleItems.typeVeille, f.typeVeille as "reglementaire" | "concurrentielle" | "technologique" | "generale"));
  if (f.categorie) conditions.push(like(veilleItems.categorie, `%${f.categorie}%`));
  if (f.niveau) conditions.push(like(veilleItems.niveau, `%${f.niveau}%`));
  if (f.territoire) conditions.push(like(veilleItems.territoire, `%${f.territoire}%`));
  if (f.search) {
    conditions.push(
      or(
        like(veilleItems.titre, `%${f.search}%`),
        like(veilleItems.resume, `%${f.search}%`)
      )
    );
  }
  if (f.dateFrom) conditions.push(gte(veilleItems.datePublication, f.dateFrom));
  if (f.dateTo) conditions.push(lte(veilleItems.datePublication, f.dateTo));

  const where = conditions.length > 0 ? and(...conditions) : undefined;

  const [items, countResult] = await Promise.all([
    db
      .select()
      .from(veilleItems)
      .where(where)
      .orderBy(desc(veilleItems.datePublication), desc(veilleItems.importedAt))
      .limit(pageSize)
      .offset(offset),
    db
      .select({ count: sql<number>`count(*)` })
      .from(veilleItems)
      .where(where),
  ]);

  return { items, total: Number(countResult[0]?.count ?? 0) };
}

export async function getVeilleDistinctValues() {
  const db = await getDb();
  if (!db) return { categories: [], niveaux: [], territoires: [] };

  const [cats, niveaux, territoires] = await Promise.all([
    db.selectDistinct({ value: veilleItems.categorie }).from(veilleItems).where(sql`${veilleItems.categorie} IS NOT NULL`),
    db.selectDistinct({ value: veilleItems.niveau }).from(veilleItems).where(sql`${veilleItems.niveau} IS NOT NULL`),
    db.selectDistinct({ value: veilleItems.territoire }).from(veilleItems).where(sql`${veilleItems.territoire} IS NOT NULL`),
  ]);

  return {
    categories: cats.map((r) => r.value!).filter(Boolean).sort(),
    niveaux: niveaux.map((r) => r.value!).filter(Boolean).sort(),
    territoires: territoires.map((r) => r.value!).filter(Boolean).sort(),
  };
}

// ─── AAP Items ────────────────────────────────────────────────────────────────

export interface AapFilters {
  categorie?: string;
  region?: string;
  departement?: string;
  search?: string;
  dateFrom?: Date;
  dateTo?: Date;
  clotureFrom?: Date;
  clotureTo?: Date;
  page?: number;
  pageSize?: number;
}

export async function getAapItems(filters: AapFilters = {}) {
  const db = await getDb();
  if (!db) return { items: [], total: 0 };

  const { page = 1, pageSize = 50, ...f } = filters;
  const offset = (page - 1) * pageSize;

  const conditions = [];
  if (f.categorie) conditions.push(eq(aapItems.categorie, f.categorie as "Handicap" | "PA" | "Enfance" | "Précarité" | "Sanitaire" | "Autre"));
  if (f.region) conditions.push(like(aapItems.region, `%${f.region}%`));
  if (f.departement) conditions.push(like(aapItems.departement, `%${f.departement}%`));
  if (f.search) conditions.push(like(aapItems.titre, `%${f.search}%`));
  if (f.dateFrom) conditions.push(gte(aapItems.datePublication, f.dateFrom));
  if (f.dateTo) conditions.push(lte(aapItems.datePublication, f.dateTo));
  if (f.clotureFrom) conditions.push(gte(aapItems.dateCloture, f.clotureFrom));
  if (f.clotureTo) conditions.push(lte(aapItems.dateCloture, f.clotureTo));

  const where = conditions.length > 0 ? and(...conditions) : undefined;

  const [items, countResult] = await Promise.all([
    db
      .select()
      .from(aapItems)
      .where(where)
      .orderBy(desc(aapItems.datePublication), desc(aapItems.importedAt))
      .limit(pageSize)
      .offset(offset),
    db
      .select({ count: sql<number>`count(*)` })
      .from(aapItems)
      .where(where),
  ]);

  return { items, total: Number(countResult[0]?.count ?? 0) };
}

export async function getAapDistinctValues() {
  const db = await getDb();
  if (!db) return { regions: [], departements: [] };

  const [regions, departements] = await Promise.all([
    db.selectDistinct({ value: aapItems.region }).from(aapItems).where(sql`${aapItems.region} IS NOT NULL`),
    db.selectDistinct({ value: aapItems.departement }).from(aapItems).where(sql`${aapItems.departement} IS NOT NULL`),
  ]);

  return {
    regions: regions.map((r) => r.value!).filter(Boolean).sort(),
    departements: departements.map((r) => r.value!).filter(Boolean).sort(),
  };
}

// ─── App Settings ─────────────────────────────────────────────────────────────

export async function getSetting(key: string): Promise<string | null> {
  const db = await getDb();
  if (!db) return null;
  const rows = await db.select().from(appSettings).where(eq(appSettings.key, key)).limit(1);
  return rows[0]?.value ?? null;
}

export async function getAllSettings(): Promise<Record<string, string>> {
  const db = await getDb();
  if (!db) return {};
  const rows = await db.select().from(appSettings);
  const map: Record<string, string> = {};
  for (const r of rows) {
    if (r.key && r.value !== null && r.value !== undefined) map[r.key] = r.value;
  }
  return map;
}

export async function setSetting(key: string, value: string): Promise<void> {
  const db = await getDb();
  if (!db) throw new Error("DB unavailable");
  await db
    .insert(appSettings)
    .values({ key, value })
    .onDuplicateKeyUpdate({ set: { value } });
}

export async function setSettings(settings: Record<string, string>): Promise<void> {
  const db = await getDb();
  if (!db) throw new Error("DB unavailable");
  for (const [key, value] of Object.entries(settings)) {
    await db
      .insert(appSettings)
      .values({ key, value })
      .onDuplicateKeyUpdate({ set: { value } });
  }
}

// ─── Import Logs ──────────────────────────────────────────────────────────────

export async function getImportLogs(limit = 50) {
  const db = await getDb();
  if (!db) return [];
  return db
    .select()
    .from(importLogs)
    .orderBy(desc(importLogs.startedAt))
    .limit(limit);
}

export async function getImportStats() {
  const db = await getDb();
  if (!db) return { totalVeille: 0, totalAap: 0, lastImport: null, total: 0, success: 0, errors: 0, totalNewRows: 0 };

  const [veilleCount, aapCount, lastLog, allLogs] = await Promise.all([
    db.select({ count: sql<number>`count(*)` }).from(veilleItems),
    db.select({ count: sql<number>`count(*)` }).from(aapItems),
    db.select().from(importLogs).orderBy(desc(importLogs.startedAt)).limit(1),
    db.select().from(importLogs),
  ]);

  const total = allLogs.length;
  const success = allLogs.filter(l => l.status === 'success').length;
  const errors = allLogs.filter(l => l.status === 'error').length;
  const totalNewRows = allLogs.reduce((sum, l) => sum + (l.newRows ?? 0), 0);

  return {
    totalVeille: Number(veilleCount[0]?.count ?? 0),
    totalAap: Number(aapCount[0]?.count ?? 0),
    lastImport: lastLog[0] ?? null,
    total,
    success,
    errors,
    totalNewRows,
  };
}

// ─── Boîte à idées ────────────────────────────────────────────────────────────

export async function createIdea(data: InsertIdea) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  await db.insert(ideas).values(data);
}

export async function getAllIdeas() {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(ideas).orderBy(desc(ideas.createdAt));
}

export async function getIdeasByUser(userId: number) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(ideas).where(eq(ideas.userId, userId)).orderBy(desc(ideas.createdAt));
}

export async function repondreIdea(
  id: number,
  reponseAdmin: string,
  reponduPar: string,
  statut: "ouvert" | "en_cours" | "resolu" | "ferme"
) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  await db.update(ideas).set({
    reponseAdmin,
    reponduPar,
    reponduAt: new Date(),
    statut,
  }).where(eq(ideas.id, id));
}

export async function updateIdeaStatut(id: number, statut: "ouvert" | "en_cours" | "resolu" | "ferme") {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  await db.update(ideas).set({ statut }).where(eq(ideas.id, id));
}

// ─── Flux RSS ────────────────────────────────────────────────────────────────────────────────────

export async function getRssFeeds(): Promise<RssFeed[]> {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(rssFeeds).orderBy(rssFeeds.name);
}

export async function getRssFeedById(id: number): Promise<RssFeed | null> {
  const db = await getDb();
  if (!db) return null;
  const rows = await db.select().from(rssFeeds).where(eq(rssFeeds.id, id)).limit(1);
  return rows[0] ?? null;
}

export async function createRssFeed(data: Omit<InsertRssFeed, "id" | "createdAt" | "updatedAt">): Promise<number> {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const result = await db.insert(rssFeeds).values(data);
  return (result[0] as any).insertId as number;
}

export async function updateRssFeed(id: number, data: Partial<Omit<InsertRssFeed, "id" | "createdAt" | "updatedAt">>): Promise<void> {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  await db.update(rssFeeds).set(data).where(eq(rssFeeds.id, id));
}

export async function deleteRssFeed(id: number): Promise<void> {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  await db.delete(rssFeeds).where(eq(rssFeeds.id, id));
}

export async function getRssSettings(): Promise<RssSettings | null> {
  const db = await getDb();
  if (!db) return null;
  const rows = await db.select().from(rssSettings).limit(1);
  if (rows.length > 0) return rows[0];
  // Créer les paramètres par défaut si inexistants
  await db.insert(rssSettings).values({
    fetchIntervalMinutes: 360,
    scheduledTime: "06:00",
    fetchMode: "scheduled",
    autoFetchEnabled: true,
  });
  const newRows = await db.select().from(rssSettings).limit(1);
  return newRows[0] ?? null;
}

export async function saveRssSettings(data: Partial<Omit<InsertRssSettings, "id" | "updatedAt">>): Promise<void> {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const existing = await db.select().from(rssSettings).limit(1);
  if (existing.length > 0) {
    await db.update(rssSettings).set(data).where(eq(rssSettings.id, existing[0].id));
  } else {
    await db.insert(rssSettings).values({
      fetchIntervalMinutes: 360,
      scheduledTime: "06:00",
      fetchMode: "scheduled",
      autoFetchEnabled: true,
      ...data,
    });
  }
}

// ─── Purge ───────────────────────────────────────────────────────────────────
export async function purgeVeilleItems(): Promise<number> {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const result = await db.delete(veilleItems);
  return (result as any).affectedRows ?? 0;
}

export async function purgeAapItems(): Promise<number> {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const result = await db.delete(aapItems);
  return (result as any).affectedRows ?? 0;
}