import type {
  AISession,
  AISessionRole,
  Board,
  Book,
  Chapter,
  Character,
  Entity,
  Note,
  Project,
  ProjectMeta,
  User,
  WorldItem,
} from "@pubscript/core";

// ---- Row shapes (mirror the SQLite schema) ----
export interface UserRow {
  id: string;
  email: string;
  pass_hash: string;
  display_name: string;
  role: "admin" | "author";
  disabled: number;
  created_at: string;
}
export interface ShareRow {
  project_id: string;
  user_id: string;
  perm: "read" | "edit";
}
export interface ProjectRow {
  id: string;
  owner_id: string;
  title: string;
  settings: string;
  cover: string;
  created_at: string;
  updated_at: string;
}
export interface BookRow {
  id: string;
  project_id: string;
  title: string;
  ord: number;
}
export interface ChapterRow {
  id: string;
  book_id: string;
  project_id: string;
  title: string;
  doc: string;
  rev: number;
  ord: number;
  updated_at: string;
}
export interface EntityRow {
  id: string;
  project_id: string;
  kind: string;
  name: string;
  fields: string;
  created_at: string;
  updated_at: string;
}
export interface BoardRow {
  id: string;
  project_id: string;
  nodes: string;
  edges: string;
  updated_at: string;
}
export interface AISessionRow {
  id: string;
  project_id: string;
  role: string;
  model: string;
  settings: string;
  messages: string;
  suggestions: string;
  updated_at: string;
}

// ---- Row -> core types ----
export function toUser(r: UserRow): User {
  return {
    id: r.id,
    email: r.email,
    displayName: r.display_name,
    role: r.role,
    createdAt: r.created_at,
  };
}

export function toProject(r: ProjectRow, shares: ShareRow[]): Project {
  return {
    id: r.id,
    projectId: r.id,
    title: r.title,
    ownerId: r.owner_id,
    sharedWith: shares.map((s) => ({ userId: s.user_id, perm: s.perm })),
    settings: JSON.parse(r.settings),
    cover: JSON.parse(r.cover),
    createdAt: r.created_at,
    updatedAt: r.updated_at,
  };
}

export function toProjectMeta(r: ProjectRow, shares: ShareRow[], user: User): ProjectMeta {
  const owned = r.owner_id === user.id;
  const mine = shares.find((s) => s.user_id === user.id);
  return {
    id: r.id,
    projectId: r.id,
    title: r.title,
    ownerId: r.owner_id,
    cover: JSON.parse(r.cover),
    createdAt: r.created_at,
    updatedAt: r.updated_at,
    perm: owned ? "edit" : (mine?.perm ?? "read"),
    owned,
  };
}

export function toBook(r: BookRow, chapters: ChapterRow[]): Book {
  return {
    id: r.id,
    projectId: r.project_id,
    title: r.title,
    order: r.ord,
    chapters: chapters
      .slice()
      .sort((a, b) => a.ord - b.ord)
      .map(toChapter),
  };
}

export function toChapter(r: ChapterRow): Chapter {
  return {
    id: r.id,
    bookId: r.book_id,
    projectId: r.project_id,
    title: r.title,
    doc: JSON.parse(r.doc),
    rev: r.rev,
    order: r.ord,
    meta: {
      wordCount: wordCount(JSON.parse(r.doc)),
      scenes: [],
      updatedAt: r.updated_at,
    },
  };
}

export function toBoard(r: BoardRow): Board {
  return {
    id: r.id,
    projectId: r.project_id,
    nodes: JSON.parse(r.nodes),
    edges: JSON.parse(r.edges),
  };
}

export function toAISession(r: AISessionRow): AISession {
  return {
    id: r.id,
    projectId: r.project_id,
    role: r.role as AISessionRole,
    model: r.model,
    settings: JSON.parse(r.settings),
    messages: JSON.parse(r.messages),
    suggestions: JSON.parse(r.suggestions),
  };
}

export function toEntity(r: EntityRow): Entity {
  const f = JSON.parse(r.fields);
  if (r.kind === "character") {
    return {
      id: r.id,
      projectId: r.project_id,
      name: r.name,
      role: f.role ?? "",
      bio: f.bio ?? "",
      appearance: f.appearance ?? "",
      voice: f.voice ?? "",
      relationships: typeof f.relationships === "string" ? JSON.parse(f.relationships) : (f.relationships ?? []),
      arc: f.arc ?? "",
      status: f.status ?? "active",
      tags: f.tags ?? [],
    } satisfies Character;
  }
  if (r.kind === "world") {
    return {
      id: r.id,
      projectId: r.project_id,
      kind: f.kind ?? "location",
      name: r.name,
      fields: f.fields ?? {},
    } satisfies WorldItem;
  }
  return {
    id: r.id,
    projectId: r.project_id,
    body: f.body ?? "",
    pinned: !!f.pinned,
    tags: f.tags ?? [],
    linkedTo: f.linkedTo ?? [],
  } satisfies Note;
}

// ---- core types -> row (for writes) ----
export function entityToRow(e: Entity): Omit<EntityRow, "created_at" | "updated_at"> {
  if ("fields" in e) {
    // WorldItem
    return {
      id: e.id,
      project_id: e.projectId,
      kind: "world",
      name: e.name,
      fields: JSON.stringify({ kind: e.kind, fields: e.fields }),
    };
  }
  if ("body" in e) {
    // Note
    return {
      id: e.id,
      project_id: e.projectId,
      kind: "note",
      name: e.body.slice(0, 80),
      fields: JSON.stringify({ body: e.body, pinned: e.pinned, tags: e.tags, linkedTo: e.linkedTo }),
    };
  }
  // Character
  const c = e as Character;
  return {
    id: c.id,
    project_id: c.projectId,
    kind: "character",
    name: c.name,
    fields: JSON.stringify({
      role: c.role,
      bio: c.bio,
      appearance: c.appearance,
      voice: c.voice,
      relationships: c.relationships,
      arc: c.arc,
      status: c.status,
      tags: c.tags,
    }),
  };
}

// ---- helpers ----
/** Concatenate every human-readable field of an entity into one searchable string. */
export function entitySearchText(e: Entity): string {
  if ("fields" in e) {
    const parts = [e.name, e.kind];
    for (const v of Object.values(e.fields)) if (typeof v === "string") parts.push(v);
    return parts.join(" ");
  }
  if ("body" in e) {
    return [e.body, ...e.tags].join(" ");
  }
  const c = e as Character;
  const relText = (c.relationships ?? []).map((r) => `${r.targetId} ${r.kind} ${r.note}`).join(" ");
  return [c.name, c.role, c.bio, c.appearance, c.voice, relText, c.arc, c.status, ...c.tags].join(" ");
}

/** Count words in a ProseMirror doc (text nodes only). */
export function wordCount(doc: unknown): number {
  let count = 0;
  const walk = (node: any): void => {
    if (node && typeof node === "object") {
      if (node.type === "text") {
        const t = String(node.text ?? "");
        count += t.split(/\s+/).filter(Boolean).length;
      }
      if (Array.isArray(node.content)) for (const c of node.content) walk(c);
    }
  };
  walk(doc);
  return count;
}