/** Row shapes and corpus loader for the cv-tailor D1 database. */

export interface ProfileRow {
  full_name: string;
  email: string | null;
  phone: string | null;
  website: string | null;
  linkedin: string | null;
  github: string | null;
  twitter: string | null;
}

export interface SummaryRow {
  role: string;
  summary: string;
}

export interface ExperienceItem {
  slug: string;
  title: string;
  company: string;
  start_date: string;
  end_date: string | null;
  location: string | null;
  profile_heading: string | null;
  bullets: string[];
  skills: string[];
}

export interface ProjectItem {
  slug: string;
  title: string;
  start_date: string | null;
  end_date: string | null;
  url: string | null;
  associated_with: string | null;
  bullets: string[];
  skills: string[];
}

export interface SkillRow {
  name: string;
  category: "language" | "framework" | "methodology";
  grp: string | null;
  tier: string | null;
  position: number;
}

export interface EducationRow {
  school: string;
  degree: string | null;
  field: string | null;
  start_date: string | null;
  end_date: string | null;
  activities: string | null;
}

export interface HonorRow {
  title: string;
  date: string | null;
  institution: string | null;
}

export interface OrganizationRow {
  name: string;
  url: string | null;
  title: string | null;
}

export interface Corpus {
  profile: ProfileRow;
  summaries: SummaryRow[];
  experience: ExperienceItem[];
  projects: ProjectItem[];
  skills: SkillRow[];
  education: EducationRow | null;
  honors: HonorRow[];
  organizations: OrganizationRow[];
}

interface BulletRow {
  parent_type: string;
  parent_slug: string;
  position: number;
  text: string;
}

interface ItemSkillRow {
  parent_type: string;
  parent_slug: string;
  skill: string;
}

type ExperienceDbRow = Omit<ExperienceItem, "bullets" | "skills">;
type ProjectDbRow = Omit<ProjectItem, "bullets" | "skills">;

const MONTHS = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];

/**
 * "2021-03-01".."" -> "Mar 2021 – Present" (month style) or "2021 – Present" (year style).
 * Uses an en dash; the LaTeX escaper converts it to `--`.
 */
export function formatRange(
  start: string | null,
  end: string | null,
  style: "month" | "year",
): string {
  if (!start) return "";
  let from: string;
  let to = "Present";
  if (style === "month") {
    from = `${MONTHS[Number(start.slice(5, 7)) - 1]} ${start.slice(0, 4)}`;
    if (end) to = `${MONTHS[Number(end.slice(5, 7)) - 1]} ${end.slice(0, 4)}`;
  } else {
    from = start.slice(0, 4);
    if (end) to = end.slice(0, 4);
  }
  return `${from} – ${to}`;
}

export async function loadCorpus(db: D1Database): Promise<Corpus> {
  const [profile, summaries, experience, projects, bullets, itemSkills, skills, education, honors, organizations] =
    await Promise.all([
      db.prepare("SELECT * FROM profile LIMIT 1").all<ProfileRow>(),
      db.prepare("SELECT role, summary FROM summaries").all<SummaryRow>(),
      db.prepare("SELECT * FROM experience ORDER BY start_date DESC").all<ExperienceDbRow>(),
      db.prepare("SELECT * FROM projects ORDER BY start_date DESC").all<ProjectDbRow>(),
      db
        .prepare("SELECT parent_type, parent_slug, position, text FROM bullets ORDER BY position")
        .all<BulletRow>(),
      db.prepare("SELECT parent_type, parent_slug, skill FROM item_skills").all<ItemSkillRow>(),
      db
        .prepare("SELECT name, category, grp, tier, position FROM skills ORDER BY position")
        .all<SkillRow>(),
      db.prepare("SELECT * FROM education LIMIT 1").all<EducationRow>(),
      db.prepare("SELECT title, date, institution FROM honors").all<HonorRow>(),
      db.prepare("SELECT name, url, title FROM organizations").all<OrganizationRow>(),
    ]);

  const profileRow = profile.results[0];
  if (!profileRow) throw new Error("D1 is empty — run `bun run sync` first.");

  const experienceItems: ExperienceItem[] = experience.results.map((r) => ({ ...r, bullets: [], skills: [] }));
  const projectItems: ProjectItem[] = projects.results.map((r) => ({ ...r, bullets: [], skills: [] }));
  const bySlug = new Map<string, { bullets: string[]; skills: string[] }>();
  for (const item of experienceItems) bySlug.set(`experience:${item.slug}`, item);
  for (const item of projectItems) bySlug.set(`project:${item.slug}`, item);
  for (const b of bullets.results) bySlug.get(`${b.parent_type}:${b.parent_slug}`)?.bullets.push(b.text);
  for (const s of itemSkills.results) bySlug.get(`${s.parent_type}:${s.parent_slug}`)?.skills.push(s.skill);

  return {
    profile: profileRow,
    summaries: summaries.results,
    experience: experienceItems,
    projects: projectItems,
    skills: skills.results,
    education: education.results[0] ?? null,
    honors: honors.results,
    organizations: organizations.results,
  };
}