import { apiGet, apiPost, apiDelete } from "@/api/client";

/**
 * The moments of work rules mount on (milestone 458), and the actions that
 * reach each one on this install — `GET /api/retrieval/moments`, the payload
 * the `list_moments` MCP tool returns, plus the counts the Settings view shows
 * beside each moment.
 */
export interface Moment {
  name: string;
  /** What is happening at this moment. */
  means: string;
  /** The kinds of action that typically reach it. */
  reached_by: string;
}

/** A shape rather than an entry: `skill.<name>`, one moment per procedure. */
export interface MomentFamily {
  name: string;
  prefix: string;
  means: string;
  reached_by: string;
}

/** `default` ships with the product; `install` is this install's own. */
export type ActionVia = "default" | "install";

export interface MomentAction {
  tool: string;
  /** Empty = every call of the tool. A command prefix for a command tool,
   *  `field=value` pairs for any other. */
  match: string;
  via: ActionVia;
}

/** A shipped default this install switched off. */
export interface RemovedDefault {
  id: number;
  tool: string;
  match: string;
  moment: string;
  reason: string | null;
  actor: string | null;
  created_at: string | null;
}

export interface MomentUsage {
  /** How many times a mounted rule arrived at this moment. */
  delivered: number;
  /** How many distinct rules did. */
  rules: number;
  /** Of those, how many an agent then opened — an upper bound: a pull records
   *  the door, not the line that prompted it. */
  opened: number;
  last_delivered_at: string | null;
}

export interface MomentsPayload {
  moments: Moment[];
  families: MomentFamily[];
  total: number;
  actions: Record<string, MomentAction[]>;
  removed_defaults: RemovedDefault[];
  /** Rules mounted per moment; a moment carrying none is absent. */
  mounted: Record<string, number>;
  /** The count read failed — `mounted` is empty for that reason, not because
   *  nothing is mounted. */
  mounted_failed?: boolean;
  usage: {
    by_moment: Record<string, MomentUsage>;
    days: number;
    /** Same distinction as `mounted_failed`, for the usage read. */
    moment_usage_failed?: boolean;
  };
}

export interface MappingChange {
  tool: string;
  match?: string;
  moment: string;
  reason?: string;
}

export function getMoments(days = 30): Promise<MomentsPayload> {
  return apiGet(`/api/retrieval/moments?days=${days}`);
}

export function mapAction(change: MappingChange): Promise<unknown> {
  return apiPost("/api/retrieval/moments/mappings", change);
}

/** Query parameters, not a body: DELETE bodies are not reliably sent. */
export function unmapAction(change: MappingChange): Promise<void> {
  const q = new URLSearchParams({
    tool: change.tool,
    match: change.match ?? "",
    moment: change.moment,
    reason: change.reason ?? "",
  });
  return apiDelete(`/api/retrieval/moments/mappings?${q.toString()}`);
}

/**
 * Proposals about a rule's moments, waiting on a person. A `mount` proposal
 * (milestone 458 step 7) comes from a pass that read the rule, or from the
 * rule being opened just after the moment fired. An `unmount` proposal (step
 * 7b) comes from sessions reporting that the mount arrived where it did not
 * apply. `GET /api/retrieval/moments/proposals`, the payload the
 * `rule_moment_proposals` MCP tool returns.
 */
export type ProposalSource = "pass" | "signal" | "edit" | "misfire";

export interface MisfireReason {
  why: string;
  reached_by: string;
  at: string;
}

export interface MomentProposal {
  proposal: "mount" | "unmount";
  moment: string;
  source: ProposalSource;
  why: string;
  /** For a misfire, `situations` counts distinct days and `co_surfaced` the reports. */
  evidence: { situations: number; projects: number; co_surfaced: number };
  created_at: string | null;
  /** Unmount proposals only: the newest reasons given, and how often each action reached the moment. */
  reasons?: MisfireReason[];
  reached_by?: Record<string, number>;
}

export interface RuleProposals {
  id: number;
  title: string;
  kind: string;
  statement: string;
  when_to_apply: string;
  home: "global" | "project";
  /** What the rule is mounted on now. */
  mounted: string[];
  proposals: MomentProposal[];
}

export interface ProposalsPayload {
  rules: RuleProposals[];
  total: number;
}

export type Verdict = "confirm" | "reject";

export interface MomentJudgment {
  rule_id: number;
  moment: string;
  verdict: Verdict;
  note?: string;
}

export interface JudgeResult {
  judged: { rule_id: number; moment: string; state: string }[];
  refused: { rule_id: number; moment?: string; error: string }[];
}

export function getProposals(ruleId?: number): Promise<ProposalsPayload> {
  return apiGet(`/api/retrieval/moments/proposals${ruleId ? `?rule_id=${ruleId}` : ""}`);
}

/**
 * A confirm MOUNTS the rule on the moment (on an unmount proposal, keeps it);
 * a reject unmounts it if mounted and stops the pair being proposed again.
 */
export function judgeProposals(judgments: MomentJudgment[]): Promise<JudgeResult> {
  return apiPost("/api/retrieval/moments/proposals/judge", { judgments });
}