import db from './database';

// ── Types ─────────────────────────────────────────────────────────────────────

export type ProjectRow = {
  id: number;
  name: string;
  description: string;
  project_json: string;
  created_at: string;
  updated_at: string;
};

export type CreateProjectInput = {
  name: string;
  description?: string;
  project_json?: string;
};

export type UpdateProjectInput = {
  name?: string;
  description?: string;
  project_json?: string;
};

// Minimal valid project definition created when none is supplied on POST
const DEFAULT_PROJECT_JSON = JSON.stringify({
  schemaVersion: '0.1.0',
  project: {
    name: '',
    pages: [],
    actions: [],
    variables: {},
    settings: {},
  },
});

// ── Queries ───────────────────────────────────────────────────────────────────

const stmtList = db.prepare<[], ProjectRow>(`
  SELECT id, name, description, project_json, created_at, updated_at
  FROM projects
  ORDER BY created_at DESC
`);

const stmtGetById = db.prepare<[number], ProjectRow>(`
  SELECT id, name, description, project_json, created_at, updated_at
  FROM projects
  WHERE id = ?
`);

const stmtInsert = db.prepare<[string, string, string], { lastInsertRowid: number }>(`
  INSERT INTO projects (name, description, project_json)
  VALUES (?, ?, ?)
`);

const stmtUpdate = db.prepare<[string, string, string, number], void>(`
  UPDATE projects
  SET name = ?, description = ?, project_json = ?,
      updated_at = strftime('%Y-%m-%dT%H:%M:%fZ', 'now')
  WHERE id = ?
`);

const stmtDelete = db.prepare<[number], void>(`
  DELETE FROM projects WHERE id = ?
`);

// ── Data access functions ─────────────────────────────────────────────────────

export function listProjects(): ProjectRow[] {
  return stmtList.all();
}

export function getProjectById(id: number): ProjectRow | undefined {
  return stmtGetById.get(id);
}

export function createProject(input: CreateProjectInput): ProjectRow {
  const { name, description = '', project_json = DEFAULT_PROJECT_JSON } = input;
  // Embed the project name into the default JSON so it is consistent
  const json =
    project_json === DEFAULT_PROJECT_JSON
      ? JSON.stringify({ ...JSON.parse(DEFAULT_PROJECT_JSON), project: { ...JSON.parse(DEFAULT_PROJECT_JSON).project, name } })
      : project_json;
  const result = stmtInsert.run(name, description, json);
  return getProjectById(result.lastInsertRowid as number) as ProjectRow;
}

export function updateProject(id: number, input: UpdateProjectInput): ProjectRow | undefined {
  const existing = getProjectById(id);
  if (!existing) return undefined;
  stmtUpdate.run(
    input.name        ?? existing.name,
    input.description ?? existing.description,
    input.project_json ?? existing.project_json,
    id,
  );
  return getProjectById(id);
}

export function deleteProject(id: number): boolean {
  const result = stmtDelete.run(id);
  return result.changes > 0;
}