// ── Query interface ───────────────────────────────────────────────────────────
// These functions describe the Origin Graph query surface. They accept a
// generic `db` client (matching Supabase's SupabaseClient shape) so the
// package doesn't take a hard dependency on @supabase/supabase-js. Wire them
// to TanStack Query's queryFn in the app layer.

import type {
  Artboard,
  Workspace,
  Origin,
  IntentDiff,
  DesignLanguageFile,
  DesignLanguage,
  DesignLanguageVersion,
  InsertDesignLanguage,
  AgentSession,
  TeamMember,
  Project,
  InsertArtboard,
  InsertOrigin,
  InsertIntentDiff,
  InsertAgentSession,
  InsertTeamMember,
  InsertProject,
  InsertWorkspace,
  DiffStatus,
  ArtboardAncestry,
} from './types.js';

// ── Minimal Supabase client interface ────────────────────────────────────────

export interface DbClient {
  from(table: string): {
    select(cols?: string): DbQuery;
    insert(row: unknown): DbMutation;
    update(row: unknown): DbMutation;
    upsert(row: unknown, opts?: { onConflict?: string }): DbMutation;
    delete(): DbMutation;
  };
  rpc(fn: string, args?: unknown): Promise<{ data: unknown; error: DbError | null }>;
}

export interface DbQuery {
  eq(col: string, val: unknown): DbQuery;
  in(col: string, vals: unknown[]): DbQuery;
  order(col: string, opts?: { ascending?: boolean }): DbQuery;
  limit(n: number): DbQuery;
  single(): Promise<{ data: unknown; error: DbError | null }>;
  then(resolve: (result: { data: unknown[]; error: DbError | null }) => void): void;
}

export interface DbMutation {
  eq(col: string, val: unknown): DbMutation;
  select(cols?: string): DbMutation;
  single(): Promise<{ data: unknown; error: DbError | null }>;
  then(resolve: (result: { data: unknown; error: DbError | null }) => void): void;
}

export interface DbError {
  message: string;
  code?: string;
}

// ── Artboard queries ──────────────────────────────────────────────────────────

export async function getArtboards(
  db: DbClient,
  workspaceId: string,
  projectId?: string,
): Promise<Artboard[]> {
  let q: DbQuery = db
    .from('artboards')
    .select('*')
    .eq('workspace_id', workspaceId);
  if (projectId) q = q.eq('project_id', projectId);
  const { data, error } = await (q.order('created_at', { ascending: false }) as unknown as Promise<{ data: Artboard[]; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

/**
 * Spec Layer 4.2 canonical function name — delegates to getArtboards.
 * Callers that use the spec-mandated name get the same result.
 */
export async function getArtboardsByWorkspace(
  db: DbClient,
  workspaceId: string,
): Promise<Artboard[]> {
  return getArtboards(db, workspaceId);
}

export async function getArtboard(db: DbClient, id: string): Promise<Artboard> {
  const { data, error } = await (db
    .from('artboards')
    .select('*')
    .eq('id', id)
    .single() as Promise<{ data: Artboard; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function createArtboard(db: DbClient, row: InsertArtboard): Promise<Artboard> {
  const { data, error } = await (db
    .from('artboards')
    .insert(row)
    .select()
    .single() as Promise<{ data: Artboard; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function updateArtboard(
  db: DbClient,
  id: string,
  patch: Partial<InsertArtboard>,
): Promise<Artboard> {
  const { data, error } = await (db
    .from('artboards')
    .update(patch)
    .eq('id', id)
    .select()
    .single() as Promise<{ data: Artboard; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function deleteArtboard(db: DbClient, id: string): Promise<void> {
  const { error } = await (db
    .from('artboards')
    .delete()
    .eq('id', id) as unknown as Promise<{ data: unknown; error: DbError | null }>);
  if (error) throw new Error(error.message);
}

export async function getArtboardAncestors(db: DbClient, artboardId: string): Promise<ArtboardAncestry[]> {
  const { data, error } = await (db
    .from('artboard_ancestry')
    .select('*')
    .eq('artboard_id', artboardId)
    .order('depth', { ascending: true }) as unknown as Promise<{ data: ArtboardAncestry[]; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

// ── Full-text artboard search (migration 006) ─────────────────────────────────
// Calls the search_artboards RPC which ranks artboards by relevance across name,
// metadata_jsonb, linked intent diff summaries, and origin source_ref.
// Returns up to `limit` results ordered by rank DESC.

export interface ArtboardSearchResult extends Artboard {
  rank: number;
}

export async function searchArtboards(
  db: DbClient,
  workspaceId: string,
  query: string,
  limit = 20,
): Promise<ArtboardSearchResult[]> {
  if (!query.trim()) return [];
  const { data, error } = await (db.rpc('search_artboards', {
    p_workspace_id: workspaceId,
    p_query: query.trim(),
    p_limit: limit,
  }) as Promise<{ data: ArtboardSearchResult[]; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data ?? [];
}

// ── Intent diff queries ───────────────────────────────────────────────────────

export async function getDiffs(db: DbClient, artboardId: string): Promise<IntentDiff[]> {
  const { data, error } = await (db
    .from('intent_diffs')
    .select('*')
    .eq('artboard_id', artboardId)
    .order('created_at', { ascending: false }) as unknown as Promise<{ data: IntentDiff[]; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function getDiffsByStatus(db: DbClient, workspaceId: string, status: DiffStatus): Promise<IntentDiff[]> {
  // Join through artboards for workspace scoping
  const { data, error } = await (db.rpc('get_diffs_by_status', { p_workspace_id: workspaceId, p_status: status }) as Promise<{ data: IntentDiff[]; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data as IntentDiff[];
}

export async function createDiff(db: DbClient, row: InsertIntentDiff): Promise<IntentDiff> {
  const { data, error } = await (db
    .from('intent_diffs')
    .insert(row)
    .select()
    .single() as Promise<{ data: IntentDiff; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function getDiff(db: DbClient, id: string): Promise<IntentDiff> {
  const { data, error } = await (db
    .from('intent_diffs')
    .select('*')
    .eq('id', id)
    .single() as Promise<{ data: IntentDiff; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function updateDiffStatus(
  db: DbClient,
  id: string,
  status: DiffStatus,
  notes?: string
): Promise<IntentDiff> {
  const { data, error } = await (db
    .from('intent_diffs')
    .update({ status, ...(notes !== undefined ? { notes } : {}) })
    .eq('id', id)
    .select()
    .single() as Promise<{ data: IntentDiff; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

// ── Design language file queries ──────────────────────────────────────────────

export async function getActiveDesignLanguageFile(
  db: DbClient,
  workspaceId: string
): Promise<DesignLanguageFile | null> {
  const { data, error } = await (db
    .from('design_language_files')
    .select('*')
    .eq('workspace_id', workspaceId)
    .order('version', { ascending: false })
    .limit(1)
    .single() as Promise<{ data: DesignLanguageFile | null; error: DbError | null }>);
  if (error?.code === 'PGRST116') return null; // No rows found
  if (error) throw new Error(error.message);
  return data;
}

// ── Phase 6: design_languages queries (migration 014) ────────────────────────

/**
 * Return the single active design language row for a workspace, or null if none
 * has been uploaded yet. Uses the UNIQUE(workspace_id) constraint — one row per
 * workspace, no is_active flag needed.
 */
export async function getDesignLanguage(
  db: DbClient,
  workspaceId: string,
): Promise<DesignLanguage | null> {
  const { data, error } = await (db
    .from('design_languages')
    .select('*')
    .eq('workspace_id', workspaceId)
    .limit(1)
    .single() as Promise<{ data: DesignLanguage | null; error: DbError | null }>);
  if (error?.code === 'PGRST116') return null; // No rows — no token file uploaded yet
  if (error) throw new Error(error.message);
  return data;
}

/**
 * Upsert a design language row (INSERT … ON CONFLICT DO UPDATE).
 * The DB enforces UNIQUE(workspace_id) so this is safe for concurrent callers.
 * Also inserts a history row into design_language_versions (handled by trigger).
 */
export async function upsertDesignLanguage(
  db: DbClient,
  row: InsertDesignLanguage,
): Promise<DesignLanguage> {
  const { data, error } = await (db
    .from('design_languages')
    .upsert(row, { onConflict: 'workspace_id' })
    .select()
    .single() as Promise<{ data: DesignLanguage; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

/**
 * Return the version history for a design language, newest first.
 * The prune trigger keeps at most 10 rows per design_language_id.
 */
export async function getDesignLanguageVersions(
  db: DbClient,
  designLanguageId: string,
): Promise<DesignLanguageVersion[]> {
  const { data, error } = await (db
    .from('design_language_versions')
    .select('*')
    .eq('design_language_id', designLanguageId)
    .order('version', { ascending: false }) as unknown as Promise<{
      data: DesignLanguageVersion[];
      error: DbError | null;
    }>);
  if (error) throw new Error(error.message);
  return data ?? [];
}

// ── Origin queries ────────────────────────────────────────────────────────────

export async function getOrigin(db: DbClient, id: string): Promise<Origin> {
  const { data, error } = await (db
    .from('origins')
    .select('*')
    .eq('id', id)
    .single() as Promise<{ data: Origin; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function createOrigin(db: DbClient, row: InsertOrigin): Promise<Origin> {
  const { data, error } = await (db
    .from('origins')
    .insert(row)
    .select()
    .single() as Promise<{ data: Origin; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

// ── Origin Graph aggregate query ─────────────────────────────────────────────
// Returns the complete provenance picture for a single artboard: the artboard
// row, its linked origin (if any), and all intent diffs ever recorded against
// it. This is the primary read path described in Layer 4.2 of the spec.

export async function getOriginGraph(
  db: DbClient,
  artboardId: string,
): Promise<{ artboard: Artboard; origin: Origin | null; diffs: IntentDiff[] }> {
  // Fetch artboard and diffs in parallel for minimum latency.
  const [artboard, diffs] = await Promise.all([
    getArtboard(db, artboardId),
    getDiffs(db, artboardId),
  ]);

  let origin: Origin | null = null;
  if (artboard.origin_id) {
    try {
      origin = await getOrigin(db, artboard.origin_id);
    } catch {
      // Origin may have been deleted (ON DELETE SET NULL on the FK) — treat as
      // missing rather than throwing, since the artboard itself is valid.
    }
  }

  return { artboard, origin, diffs };
}

// ── Agent session queries ─────────────────────────────────────────────────────

export async function createAgentSession(db: DbClient, row: InsertAgentSession): Promise<AgentSession> {
  const { data, error } = await (db
    .from('agent_sessions')
    .insert(row)
    .select()
    .single() as Promise<{ data: AgentSession; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

// ── Workspace queries ─────────────────────────────────────────────────────────

export async function createWorkspace(db: DbClient, row: InsertWorkspace): Promise<Workspace> {
  const { data, error } = await (db
    .from('workspaces')
    .insert(row)
    .select()
    .single() as Promise<{ data: Workspace; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function getWorkspace(db: DbClient, id: string): Promise<Workspace> {
  const { data, error } = await (db
    .from('workspaces')
    .select('*')
    .eq('id', id)
    .single() as Promise<{ data: Workspace; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function getTeamMembers(db: DbClient, workspaceId: string): Promise<TeamMember[]> {
  const { data, error } = await (db
    .from('team_members')
    .select('*')
    .eq('workspace_id', workspaceId) as unknown as Promise<{ data: TeamMember[]; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function addTeamMember(db: DbClient, row: InsertTeamMember): Promise<TeamMember> {
  const { data, error } = await (db
    .from('team_members')
    .insert(row)
    .select()
    .single() as Promise<{ data: TeamMember; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function removeTeamMember(
  db: DbClient,
  workspaceId: string,
  /** The email address of the member to remove. */
  email: string,
): Promise<void> {
  const { error } = await (db
    .from('team_members')
    .delete()
    .eq('workspace_id', workspaceId)
    .eq('email', email) as unknown as Promise<{ data: unknown; error: DbError | null }>);
  if (error) throw new Error(error.message);
}

export async function deleteWorkspace(db: DbClient, id: string): Promise<void> {
  const { error } = await (db
    .from('workspaces')
    .delete()
    .eq('id', id) as unknown as Promise<{ data: unknown; error: DbError | null }>);
  if (error) throw new Error(error.message);
}

export async function updateWorkspace(
  db: DbClient,
  id: string,
  patch: { name?: string },
): Promise<Workspace> {
  const { data, error } = await (db
    .from('workspaces')
    .update(patch)
    .eq('id', id)
    .select()
    .single() as Promise<{ data: Workspace; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

// ── Project queries ───────────────────────────────────────────────────────────

export async function getProject(db: DbClient, id: string): Promise<Project> {
  const { data, error } = await (db
    .from('projects')
    .select('*')
    .eq('id', id)
    .single() as Promise<{ data: Project; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function createProject(db: DbClient, row: InsertProject): Promise<Project> {
  const { data, error } = await (db
    .from('projects')
    .insert(row)
    .select()
    .single() as Promise<{ data: Project; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function updateProject(
  db: DbClient,
  id: string,
  patch: Partial<InsertProject>,
): Promise<Project> {
  const { data, error } = await (db
    .from('projects')
    .update(patch)
    .eq('id', id)
    .select()
    .single() as Promise<{ data: Project; error: DbError | null }>);
  if (error) throw new Error(error.message);
  return data;
}

export async function deleteProject(db: DbClient, id: string): Promise<void> {
  const { error } = await (db
    .from('projects')
    .delete()
    .eq('id', id) as unknown as Promise<{ data: unknown; error: DbError | null }>);
  if (error) throw new Error(error.message);
}