import type {
  ChangeItem,
  PMFlowExecutionContext,
  PMFlowReviewDecisionAction,
  PMFlowRiskLevel,
  ProjectTruthState,
} from "@/features/pmflow-os/types";
export type { PMFlowReviewerRouting, PMFlowReviewerRoutingItem, PMFlowReviewerSuggestion } from "@/features/pmflow-os/types";

type ApiEnvelope<T> = { code: number; message: string; data: T };
const API_BASE = "/api";

function unwrap<T>(raw: ApiEnvelope<T> | T): T {
  if (raw && typeof raw === "object" && "data" in (raw as Record<string, unknown>)) {
    return (raw as ApiEnvelope<T>).data;
  }
  return raw as T;
}

function extractErrorMessage(payload: unknown, fallback: string): string {
  if (payload && typeof payload === "object") {
    const record = payload as Record<string, unknown>;
    if (typeof record.message === "string" && record.message.trim()) return record.message.trim();
    if (typeof record.detail === "string" && record.detail.trim()) return record.detail.trim();
  }
  return fallback;
}

function storedAuthToken(): string | null {
  if (typeof window === "undefined") return null;
  return window.localStorage.getItem("auth_token") || window.localStorage.getItem("token") || window.localStorage.getItem("access_token");
}

async function request<T>(endpoint: string, init: { method: "GET" | "POST"; body?: unknown }): Promise<T> {
  const token = storedAuthToken();
  const response = await fetch(`${API_BASE}${endpoint}`, {
    method: init.method,
    headers: {
      "Content-Type": "application/json",
      ...(token ? { Authorization: `Bearer ${token}` } : {}),
    },
    body: init.body === undefined ? undefined : JSON.stringify(init.body),
  });
  const payload = await response.json().catch(() => null);
  if (!response.ok) {
    throw new Error(extractErrorMessage(payload, `HTTP ${response.status}`));
  }
  if (payload && typeof payload === "object" && "code" in payload) {
    const code = typeof (payload as Record<string, unknown>).code === "number" ? (payload as Record<string, unknown>).code : 0;
    if (code !== 0) {
      throw new Error(extractErrorMessage(payload, `HTTP ${response.status}`));
    }
  }
  return unwrap(payload as ApiEnvelope<T> | T);
}

function get<T>(endpoint: string): Promise<T> {
  return request<T>(endpoint, { method: "GET" });
}

function post<T>(endpoint: string, body: unknown = {}): Promise<T> {
  return request<T>(endpoint, { method: "POST", body });
}

export interface PMFlowExecutionSummary {
  projectId: string;
  execution: PMFlowExecutionContext;
  releaseGate: PMFlowReleaseGate;
  releaseSignals?: PMFlowReleaseSignals;
  devSync: Record<string, unknown>;
  promptPackage?: PMFlowPromptPackage | null;
  repoBindings: PMFlowRepoBinding[];
  activeDevTasks: PMFlowDevTask[];
  recentProgressEvents: PMFlowProgressEvent[];
  recentDeliveries: PMFlowRecentDelivery[];
  warnings: string[];
}

export type PMFlowExecutionRuntimeTarget = "local_bridge" | "codex" | "github_agent" | "manual";
export type PMFlowExecutionProgressSource = "local_bridge" | "codex" | "github_agent" | "manual";
export type PMFlowExecutionProgressEventType =
  | "branch_created"
  | "commit"
  | "pr_opened"
  | "pr_synced"
  | "test_passed"
  | "test_failed"
  | "checks_passed"
  | "failed"
  | "blocked"
  | "merged"
  | "accepted"
  | "manual_progress";

export type PMFlowReleaseGateStatus = "ready" | "blocked" | "needs_confirmation" | "empty";
export type PMFlowReleaseValidationDecision = "enter_release_candidate" | "keep_blocked";

export interface PMFlowReleaseGateCheck {
  key: string;
  label: string;
  status: "passed" | "failed" | "missing";
  detail?: string | null;
}

export interface PMFlowReleaseGateEvidence {
  id: string;
  type: string;
  summary: string;
  taskTitle?: string | null;
  repo?: string | null;
  branchName?: string | null;
  commitSha?: string | null;
  prNumber?: number | null;
  occurredAt?: string | null;
}

export interface PMFlowReleaseGate {
  status: PMFlowReleaseGateStatus;
  title: string;
  summary: string;
  blockingReasons: string[];
  nextActions: string[];
  checks: PMFlowReleaseGateCheck[];
  evidence: PMFlowReleaseGateEvidence[];
  latestValidationRun?: PMFlowReleaseValidationRun | null;
  updatedAt?: string | null;
}

export interface PMFlowReleaseValidationRun {
  id: string;
  projectId: string;
  charterId?: string | null;
  releaseNodeId?: string | null;
  status: "ready" | "blocked" | "needs_confirmation" | string;
  score?: number | null;
  keyMetrics: Record<string, unknown>;
  riskItems: Array<Record<string, unknown>>;
  rollbackPlan: Record<string, unknown>;
  validationSummary: Record<string, unknown>;
  createdBy?: string | null;
  createdAt?: string | null;
  updatedAt?: string | null;
}

export interface PMFlowReleaseValidationRunRequest {
  decision: PMFlowReleaseValidationDecision;
  note?: string | null;
}

export interface PMFlowReleaseValidationRunResult {
  releaseValidationRun: PMFlowReleaseValidationRun;
  executionSummary: PMFlowExecutionSummary;
  warnings: string[];
}

export interface PMFlowReleaseSignals {
  status: "active" | "empty" | string;
  relationship: {
    releaseGateStatus?: string | null;
    latestValidationRunId?: string | null;
    latestValidationRunStatus?: string | null;
    source?: string | null;
    changeSetCreated?: boolean;
  };
  summary: {
    feedbackCount?: number;
    revenueEventCount?: number;
    iterationRecommendationCount?: number;
    latestSignalAt?: string | null;
  };
  feedback: PMFlowReleaseFeedbackIngest[];
  revenueEvents: PMFlowReleaseRevenueEvent[];
  recommendations: PMFlowIterationRecommendation[];
  recommendationGroups?: PMFlowIterationRecommendationGroup[];
  nextActions: string[];
  warnings: string[];
}

export interface PMFlowReleaseFeedbackIngest {
  id: string;
  projectId: string;
  charterId?: string | null;
  sourceType: string;
  title?: string | null;
  content: string;
  metrics: Record<string, unknown>;
  samples: Array<Record<string, unknown>>;
  status: string;
  createdAt?: string | null;
  updatedAt?: string | null;
}

export interface PMFlowReleaseRevenueEvent {
  id: string;
  projectId: string;
  sourceType: string;
  category: string;
  currency: string;
  amountUsd: number;
  externalRef?: string | null;
  eventPayload: Record<string, unknown>;
  occurredAt?: string | null;
  createdAt?: string | null;
  updatedAt?: string | null;
}

export interface PMFlowIterationRecommendation {
  id: string;
  projectId: string;
  charterId?: string | null;
  feedbackIngestId?: string | null;
  status: string;
  priority: string;
  recommendationSummary: Record<string, unknown>;
  proposedCharterPatch: Record<string, unknown>;
  proposedTasks: Array<Record<string, unknown>>;
  changeSetCreated: boolean;
  changeSetId?: string | null;
  groupKey?: string | null;
  duplicateOf?: string | null;
  mergedCount?: number;
  impactLevel?: string | null;
  riskLevel?: string | null;
  suggestedChangeTypes?: string[];
  reviewPriority?: string | null;
  quality?: Record<string, unknown>;
  createdAt?: string | null;
  updatedAt?: string | null;
}

export interface PMFlowIterationRecommendationGroup {
  groupKey: string;
  title?: string | null;
  recommendationIds: string[];
  mergedCount: number;
  impactLevel: string;
  riskLevel: string;
  suggestedChangeTypes: string[];
  reviewPriority: string;
  changeSetCreated: boolean;
  changeSetId?: string | null;
  rationale?: string | null;
}

export interface PMFlowReleaseFeedbackIngestRequest {
  source_type?: string;
  title?: string | null;
  content: string;
  charter_id?: string | null;
  metrics?: Record<string, unknown>;
  samples?: Array<Record<string, unknown>>;
}

export interface PMFlowReleaseFeedbackIngestResult {
  ingest: PMFlowReleaseFeedbackIngest;
  recommendation: PMFlowIterationRecommendation;
  releaseSignals: PMFlowReleaseSignals;
  executionSummary: PMFlowExecutionSummary;
  warnings: string[];
}

export interface PMFlowIterationRecommendationChangeSetDraftRequest {
  note?: string | null;
}

export interface PMFlowIterationRecommendationGroupChangeSetDraftRequest {
  recommendation_ids?: string[];
  note?: string | null;
}

export interface PMFlowIterationRecommendationChangeSetDraftResult {
  changeSetDetail: PMFlowChangeSetDetail;
  executionSummary: PMFlowExecutionSummary;
  warnings: string[];
}

export interface PMFlowExecutionHandoffRequest {
  task_id: string;
  repo_binding_id?: string | null;
  runtime_target: PMFlowExecutionRuntimeTarget;
  note?: string | null;
}

export interface PMFlowExecutionHandoffConsumeRequest {
  runtime_target?: PMFlowExecutionRuntimeTarget | null;
  consumer_label?: string | null;
  note?: string | null;
}

export interface PMFlowExecutionProgressEventRequest {
  task_id: string;
  event_type: PMFlowExecutionProgressEventType;
  source?: PMFlowExecutionProgressSource;
  repo_binding_id?: string | null;
  branch_name?: string | null;
  commit_sha?: string | null;
  pr_number?: number | null;
  test_summary?: string | null;
  workflow_state?: string | null;
  summary?: string | null;
  event_source_id?: string | null;
  occurred_at?: string | null;
}

export interface PMFlowPromptPackage {
  id: string;
  project_id: string;
  charter_id: string;
  task_id?: string | null;
  status: string;
  package_kind: string;
  package_text: string;
  package_payload: Record<string, unknown>;
  created_at?: string | null;
}

export interface PMFlowRepoBinding {
  id: string;
  project_id: string;
  provider: string;
  owner: string;
  repo_name: string;
  full_name: string;
  default_branch: string;
  external_repo_id?: string | null;
  installation_id?: string | null;
  installation_account_login?: string | null;
  app_state?: string;
  status: string;
  task_link_count?: number;
  recent_event_count?: number;
}

export interface PMFlowDevTask {
  id: string;
  title: string;
  description?: string | null;
  status: string;
  priority?: string | null;
  estimated_hours?: number | null;
  project_id: string;
  charter_id?: string | null;
  charter_title?: string | null;
  assignee?: { id: string; name?: string | null; role?: string | null } | null;
  prompt_package_count?: number;
  model_binding?: Record<string, unknown> | null;
  code_link?: {
    id: string;
    status: string;
    branch_name?: string | null;
    pr_number?: number | null;
    last_commit_sha?: string | null;
    repo?: PMFlowRepoBinding | null;
  } | null;
}

export interface PMFlowProgressEvent {
  id: string;
  event_type: string;
  source: string;
  summary?: string | null;
  workflow_state?: string | null;
  derived_task_status?: string | null;
  delivery_id?: string | null;
  event_source_id?: string | null;
  occurred_at?: string | null;
  task?: { id: string; title?: string | null; status?: string | null; priority?: string | null };
  user?: { id: string; name?: string | null; role?: string | null } | null;
  repo?: PMFlowRepoBinding | null;
  branch_name?: string | null;
  pr_number?: number | null;
  commit_sha?: string | null;
}

export interface PMFlowRecentDelivery {
  id: string;
  delivery_id: string;
  event_type: string;
  project_id?: string | null;
  repo_binding_id?: string | null;
  installation_id?: string | null;
  status: string;
  failure_reason?: string | null;
  repository_full_name?: string | null;
  received_at?: string | null;
}

export interface PMFlowThreadMessageResponse {
  id: string;
  threadId: string;
  projectId: string;
  role: string;
  author: string;
  content: string;
  createdAt: string;
  status: string;
  source: string;
  metadata: Record<string, unknown>;
}

export interface PMFlowProposedChangeItem {
  group: ChangeItem["group"];
  object_type: Exclude<ChangeItem["objectType"], "Thread" | "ChangeSet" | "Approval" | "Evidence">;
  object_id?: string | null;
  title: string;
  summary: string;
  diff?: string;
  payload?: Record<string, unknown>;
  confidence?: number;
  risk_level?: PMFlowRiskLevel;
}

export interface PMFlowChangeSetDetail {
  changeSet: Record<string, unknown>;
  items: Array<Record<string, unknown>>;
  evidence: Array<Record<string, unknown>>;
  approvals: Array<Record<string, unknown>>;
}

export interface PMFlowChangeSetCommitResult {
  changeSet: Record<string, unknown>;
  committedItems: Array<Record<string, unknown>>;
  skippedItems: Array<Record<string, unknown>>;
  failedItems: Array<Record<string, unknown>>;
  projectTruthState?: ProjectTruthState | null;
}

export interface PMFlowReviewDecisionRequest {
  action: PMFlowReviewDecisionAction;
  reviewer_id?: number;
  reason?: string | null;
  item_ids?: string[];
}

export interface PMFlowReviewDecisionResult {
  changeSetDetail: PMFlowChangeSetDetail;
  truthState: ProjectTruthState;
  warnings: string[];
}

export async function getPMFlowTruthState(projectId: string): Promise<ProjectTruthState> {
  return get<ProjectTruthState>(`/pmflow-os/projects/${projectId}/truth-state`);
}

export async function getPMFlowExecutionSummary(projectId: string): Promise<PMFlowExecutionSummary> {
  return get<PMFlowExecutionSummary>(`/pmflow-os/projects/${projectId}/execution-summary`);
}

export async function createPMFlowExecutionHandoff(
  projectId: string,
  payload: PMFlowExecutionHandoffRequest
): Promise<PMFlowExecutionSummary> {
  return post<PMFlowExecutionSummary>(`/pmflow-os/projects/${projectId}/execution-handoffs`, payload);
}

export async function consumePMFlowExecutionHandoff(
  projectId: string,
  promptPackageId: string,
  payload: PMFlowExecutionHandoffConsumeRequest = {}
): Promise<PMFlowExecutionSummary> {
  return post<PMFlowExecutionSummary>(`/pmflow-os/projects/${projectId}/execution-handoffs/${promptPackageId}/consume`, payload);
}

export async function createPMFlowExecutionProgressEvent(
  projectId: string,
  payload: PMFlowExecutionProgressEventRequest
): Promise<PMFlowExecutionSummary> {
  return post<PMFlowExecutionSummary>(`/pmflow-os/projects/${projectId}/execution-progress-events`, payload);
}

export async function createPMFlowReleaseValidationRun(
  projectId: string,
  payload: PMFlowReleaseValidationRunRequest
): Promise<PMFlowReleaseValidationRunResult> {
  return post<PMFlowReleaseValidationRunResult>(`/pmflow-os/projects/${projectId}/release-validation-runs`, payload);
}

export async function createPMFlowReleaseFeedbackIngest(
  projectId: string,
  payload: PMFlowReleaseFeedbackIngestRequest
): Promise<PMFlowReleaseFeedbackIngestResult> {
  return post<PMFlowReleaseFeedbackIngestResult>(`/pmflow-os/projects/${projectId}/release-feedback-ingests`, payload);
}

export async function createPMFlowIterationRecommendationChangeSetDraft(
  projectId: string,
  recommendationId: string,
  payload: PMFlowIterationRecommendationChangeSetDraftRequest = {}
): Promise<PMFlowIterationRecommendationChangeSetDraftResult> {
  return post<PMFlowIterationRecommendationChangeSetDraftResult>(
    `/pmflow-os/projects/${projectId}/iteration-recommendations/${recommendationId}/change-set-drafts`,
    payload
  );
}

export async function createPMFlowIterationRecommendationGroupChangeSetDraft(
  projectId: string,
  groupKey: string,
  payload: PMFlowIterationRecommendationGroupChangeSetDraftRequest = {}
): Promise<PMFlowIterationRecommendationChangeSetDraftResult> {
  return post<PMFlowIterationRecommendationChangeSetDraftResult>(
    `/pmflow-os/projects/${projectId}/iteration-recommendation-groups/${encodeURIComponent(groupKey)}/change-set-drafts`,
    payload
  );
}

export async function createPMFlowThreadMessage(
  projectId: string,
  threadId: string,
  payload: { content: string; source?: string; attachments?: Array<Record<string, unknown>> }
): Promise<PMFlowThreadMessageResponse> {
  return post<PMFlowThreadMessageResponse>(`/pmflow-os/projects/${projectId}/threads/${threadId}/messages`, payload);
}

export async function createPMFlowExtraction(
  projectId: string,
  payload: {
    thread_id: string;
    message_id: string;
    scope?: string;
    summary?: string;
    headline?: string;
    routing_meta?: Record<string, unknown>;
    proposed_items: PMFlowProposedChangeItem[];
  }
): Promise<PMFlowChangeSetDetail> {
  return post<PMFlowChangeSetDetail>(`/pmflow-os/projects/${projectId}/extractions`, payload);
}

export async function getPMFlowChangeSet(projectId: string, changeSetId: string): Promise<PMFlowChangeSetDetail> {
  return get<PMFlowChangeSetDetail>(`/pmflow-os/projects/${projectId}/change-sets/${changeSetId}`);
}

export async function acceptPMFlowChangeItem(changeItemId: string): Promise<PMFlowChangeSetDetail> {
  return post<PMFlowChangeSetDetail>(`/pmflow-os/change-items/${changeItemId}/accept`);
}

export async function editPMFlowChangeItem(
  changeItemId: string,
  payload: { summary?: string; diff?: string; payload_patch?: Record<string, unknown>; reason?: string }
): Promise<PMFlowChangeSetDetail> {
  return post<PMFlowChangeSetDetail>(`/pmflow-os/change-items/${changeItemId}/edit`, payload);
}

export async function deferPMFlowChangeItem(changeItemId: string, reason?: string): Promise<PMFlowChangeSetDetail> {
  return post<PMFlowChangeSetDetail>(`/pmflow-os/change-items/${changeItemId}/defer`, reason ? { reason } : {});
}

export async function commitPMFlowChangeSet(
  changeSetId: string,
  payload: { item_ids?: string[]; mode?: "atomic"; note?: string } = {}
): Promise<PMFlowChangeSetCommitResult> {
  return post<PMFlowChangeSetCommitResult>(`/pmflow-os/change-sets/${changeSetId}/commit`, { mode: "atomic", ...payload });
}

export async function createPMFlowReviewDecision(
  changeSetId: string,
  payload: PMFlowReviewDecisionRequest
): Promise<PMFlowReviewDecisionResult> {
  return post<PMFlowReviewDecisionResult>(`/pmflow-os/change-sets/${changeSetId}/review-decisions`, payload);
}