import { z } from "zod";
import type {
  Agent,
  AgentTemplate,
  AgentTemplateSummary,
  Attachment,
  CreateAgentFromTemplateResponse,
  GroupedIssuesResponse,
  ListIssuesResponse,
  ListWebhookDeliveriesResponse,
  TimelineEntry,
  User,
  WebhookDelivery,
} from "../types";

// ---------------------------------------------------------------------------
// Schemas for the highest-risk API endpoints — those whose responses drive
// the issue detail page (timeline, comments, subscribers) and the issues
// list. These are the surfaces that white-screened in #2143 / #2147 / #2192.
//
// These schemas are intentionally LENIENT:
//   - String enums are stored as `z.string()` rather than `z.enum([...])`.
//     A new server-side enum value should render as a generic fallback in
//     the UI, never crash a `safeParse`.
//   - Optional fields are unioned with `null` and given fallbacks where
//     existing UI code already coerces them.
//   - Arrays default to `[]` so a missing `reactions` / `attachments` /
//     `entries` field doesn't take the page down.
//   - Every object schema ends with `.loose()` so unknown server-side
//     fields pass through unchanged. zod 4's `.object()` defaults to STRIP,
//     which would silently delete fields the schema didn't explicitly list
//     — fine while the TS type doesn't claim them, but the moment a future
//     PR adds a TS field without updating the schema, the cast `as T` lies
//     and the field shows up as `undefined` at runtime. `.loose()` removes
//     that synchronisation hazard.
//
// These schemas are deliberately not typed as `z.ZodType<TimelineEntry>` /
// `z.ZodType<Issue>` etc. — the strict TS types narrow string fields to
// literal unions, which would defeat the leniency above. `parseWithFallback`
// returns the parsed value cast to the caller-supplied `T`, so the strict
// type still flows out at the call site; the schema only guards shape.
// ---------------------------------------------------------------------------

const ReactionSchema = z.object({
  id: z.string(),
  comment_id: z.string(),
  actor_type: z.string(),
  actor_id: z.string(),
  emoji: z.string(),
  created_at: z.string(),
});

// Nested attachments embedded in timeline/comment responses stay lenient on
// purpose: a single malformed attachment must not knock the whole timeline
// into the fallback `[]`.
const AttachmentSchema = z.object({
  id: z.string(),
}).loose();

// Standalone attachment lookup (`GET /api/attachments/{id}`) is the source of
// truth for click-time download URLs. The two fields the download flow opens
// in a new tab — `download_url` and `url` — must be strings, otherwise we'd
// happily `window.open(undefined)`. `filename` gates the toast/title and is
// also enforced so a missing value falls back to the empty record below.
export const AttachmentResponseSchema = z.object({
  id: z.string(),
  url: z.string(),
  download_url: z.string(),
  filename: z.string(),
  chat_session_id: z.string().nullable().optional(),
  chat_message_id: z.string().nullable().optional(),
}).loose();

export const EMPTY_ATTACHMENT: Attachment = {
  id: "",
  workspace_id: "",
  issue_id: null,
  comment_id: null,
  chat_session_id: null,
  chat_message_id: null,
  uploader_type: "",
  uploader_id: "",
  filename: "",
  url: "",
  download_url: "",
  content_type: "",
  size_bytes: 0,
  created_at: "",
};

// All object schemas use `.loose()` so unknown server-side fields pass
// through unchanged. zod 4's `.object()` defaults to STRIP, which would
// silently drop new fields and surface as a "field neither showed up in
// the UI" mystery the next time the TS type adopted them but the schema
// wasn't updated in lock-step. `.loose()` removes that synchronisation
// hazard — the schema validates the shape it knows about and leaves the
// rest alone.
const TimelineEntrySchema = z.object({
  type: z.string(),
  id: z.string(),
  actor_type: z.string(),
  actor_id: z.string(),
  created_at: z.string(),
  action: z.string().optional(),
  details: z.record(z.string(), z.unknown()).optional(),
  content: z.string().optional(),
  parent_id: z.string().nullable().optional(),
  updated_at: z.string().optional(),
  comment_type: z.string().optional(),
  reactions: z.array(ReactionSchema).optional(),
  attachments: z.array(AttachmentSchema).optional(),
  coalesced_count: z.number().optional(),
}).loose();

// /timeline returns a flat array of TimelineEntry, oldest first. The
// previously cursor-paginated wrapper was removed (#1929) — at observed data
// sizes (p99 ~30 entries per issue) paged delivery only created bugs.
export const TimelineEntriesSchema = z.array(TimelineEntrySchema);

export const EMPTY_TIMELINE_ENTRIES: TimelineEntry[] = [];

export const CommentSchema = z.object({
  id: z.string(),
  issue_id: z.string(),
  author_type: z.string(),
  author_id: z.string(),
  content: z.string(),
  type: z.string(),
  parent_id: z.string().nullable(),
  reactions: z.array(ReactionSchema).default([]),
  attachments: z.array(AttachmentSchema).default([]),
  created_at: z.string(),
  updated_at: z.string(),
}).loose();

export const CommentsListSchema = z.array(CommentSchema);

const IssueSchema = z.object({
  id: z.string(),
  workspace_id: z.string(),
  number: z.number(),
  identifier: z.string(),
  title: z.string(),
  description: z.string().nullable(),
  status: z.string(),
  priority: z.string(),
  assignee_type: z.string().nullable(),
  assignee_id: z.string().nullable(),
  creator_type: z.string(),
  creator_id: z.string(),
  parent_issue_id: z.string().nullable(),
  project_id: z.string().nullable(),
  position: z.number(),
  start_date: z.string().nullable(),
  due_date: z.string().nullable(),
  reactions: z.array(z.unknown()).optional(),
  labels: z.array(z.unknown()).optional(),
  created_at: z.string(),
  updated_at: z.string(),
}).loose();

export const ListIssuesResponseSchema = z.object({
  issues: z.array(IssueSchema).default([]),
  total: z.number().default(0),
}).loose();

export const EMPTY_LIST_ISSUES_RESPONSE: ListIssuesResponse = {
  issues: [],
  total: 0,
};

const IssueAssigneeGroupSchema = z.object({
  id: z.string(),
  assignee_type: z.string().nullable(),
  assignee_id: z.string().nullable(),
  issues: z.array(IssueSchema).default([]),
  total: z.number().default(0),
}).loose();

export const GroupedIssuesResponseSchema = z.object({
  groups: z.array(IssueAssigneeGroupSchema).default([]),
}).loose();

export const EMPTY_GROUPED_ISSUES_RESPONSE: GroupedIssuesResponse = {
  groups: [],
};

const SubscriberSchema = z.object({
  issue_id: z.string(),
  user_type: z.string(),
  user_id: z.string(),
  reason: z.string(),
  created_at: z.string(),
}).loose();

export const SubscribersListSchema = z.array(SubscriberSchema);

export const ChildIssuesResponseSchema = z.object({
  issues: z.array(IssueSchema).default([]),
}).loose();

export const OnboardingRuntimeBootstrapResponseSchema = z.object({
  workspace_id: z.string(),
  agent_id: z.string(),
  issue_id: z.string(),
}).loose();

export const OnboardingNoRuntimeBootstrapResponseSchema = z.object({
  workspace_id: z.string(),
  issue_id: z.string(),
}).loose();

// ---------------------------------------------------------------------------
// Workspace dashboard schemas
//
// The dashboard hits three independent rollup endpoints. Each returns a flat
// array, and every field is consumed by chart / KPI math — a missing number
// silently degrades to NaN downstream, so we coerce missing numbers to 0.
// String fields stay lenient (no enum narrowing) to survive future model /
// agent ID drift.
// ---------------------------------------------------------------------------

const DashboardUsageDailySchema = z.object({
  date: z.string(),
  model: z.string(),
  input_tokens: z.number().default(0),
  output_tokens: z.number().default(0),
  cache_read_tokens: z.number().default(0),
  cache_write_tokens: z.number().default(0),
  task_count: z.number().default(0),
}).loose();

export const DashboardUsageDailyListSchema = z.array(DashboardUsageDailySchema);

const DashboardUsageByAgentSchema = z.object({
  agent_id: z.string(),
  model: z.string(),
  input_tokens: z.number().default(0),
  output_tokens: z.number().default(0),
  cache_read_tokens: z.number().default(0),
  cache_write_tokens: z.number().default(0),
  task_count: z.number().default(0),
}).loose();

export const DashboardUsageByAgentListSchema = z.array(DashboardUsageByAgentSchema);

const DashboardAgentRunTimeSchema = z.object({
  agent_id: z.string(),
  total_seconds: z.number().default(0),
  task_count: z.number().default(0),
  failed_count: z.number().default(0),
}).loose();

export const DashboardAgentRunTimeListSchema = z.array(DashboardAgentRunTimeSchema);

const DashboardRunTimeDailySchema = z.object({
  date: z.string(),
  total_seconds: z.number().default(0),
  task_count: z.number().default(0),
  failed_count: z.number().default(0),
}).loose();

export const DashboardRunTimeDailyListSchema = z.array(DashboardRunTimeDailySchema);

// ---------------------------------------------------------------------------
// Agent template catalog — `/api/agent-templates*` and the
// create-from-template response. The desktop app's create-agent picker
// reaches these endpoints, and a future server change to the template shape
// would white-screen older installed builds (#2192 pattern) without these
// parsers. Lenient by the same rules as IssueSchema above: arrays default to
// `[]`, optional fields stay optional, `.loose()` lets unknown fields pass
// through unchanged.
// ---------------------------------------------------------------------------

const AgentTemplateSkillRefSchema = z.object({
  source_url: z.string(),
  cached_name: z.string().default(""),
  cached_description: z.string().default(""),
}).loose();

const AgentTemplateSummarySchemaBase = z.object({
  slug: z.string(),
  name: z.string(),
  description: z.string().default(""),
  category: z.string().optional(),
  icon: z.string().optional(),
  accent: z.string().optional(),
  // skills MUST default to [] — picker code reads `template.skills.length`
  // and `.map(...)`, both of which crash on `undefined`. The most common
  // future drift (field renamed / wrapped) lands here.
  skills: z.array(AgentTemplateSkillRefSchema).default([]),
}).loose();

export const AgentTemplateSummarySchema = AgentTemplateSummarySchemaBase;

// List endpoint historically returns a bare array. Server could legitimately
// migrate to `{templates: [...]}` later — we accept either shape so an old
// desktop survives the upgrade.
export const AgentTemplateSummaryListSchema = z.union([
  z.array(AgentTemplateSummarySchemaBase),
  z.object({ templates: z.array(AgentTemplateSummarySchemaBase).default([]) })
    .loose()
    .transform((v) => v.templates),
]);

export const EMPTY_AGENT_TEMPLATE_SUMMARY_LIST: AgentTemplateSummary[] = [];

export const AgentTemplateSchema = AgentTemplateSummarySchemaBase.extend({
  // Detail-only field. Default "" so a malformed detail still renders the
  // header + skill list; the user just sees an empty Instructions block.
  instructions: z.string().default(""),
}).loose();

// Used as the parse fallback for `GET /api/agent-templates/:slug`. Slug comes
// from the URL, so we round-trip the requested one back into the fallback
// at the call site (see `getAgentTemplate` in client.ts).
export const EMPTY_AGENT_TEMPLATE_DETAIL: AgentTemplate = {
  slug: "",
  name: "",
  description: "",
  skills: [],
  instructions: "",
};

// `agent` is a full Agent record — schematising every field would duplicate
// a 50-field interface and bit-rot fast. We keep it loose and require only
// `id`, the one field the create-from-template flow consumes (used to
// navigate to the new agent's detail page). Downstream code already
// optional-chains the rest.
const MinimalAgentSchema = z.object({
  id: z.string(),
}).loose();

export const CreateAgentFromTemplateResponseSchema = z.object({
  agent: MinimalAgentSchema,
  imported_skill_ids: z.array(z.string()).default([]),
  reused_skill_ids: z.array(z.string()).default([]),
}).loose();

// Fallback when the success response fails to parse. The agent server-side
// has likely been created already, so we can't pretend nothing happened —
// the caller (`create-agent-dialog.tsx`) is responsible for noticing
// `agent.id === ""` and skipping navigation while keeping the list
// invalidation, so the user finds their new agent in the list.
export const EMPTY_CREATE_AGENT_FROM_TEMPLATE_RESPONSE: CreateAgentFromTemplateResponse = {
  agent: { id: "" } as Agent,
  imported_skill_ids: [],
  reused_skill_ids: [],
};

// Squad member status — backs the Squad detail page's Members tab. status
// is `string | null` (not the narrow `SquadMemberStatusValue` union) so a
// new server-side status doesn't fail the parse; the UI defaults to a
// neutral pill for unknown values.
const SquadActiveIssueBriefSchema = z.object({
  issue_id: z.string(),
  identifier: z.string(),
  title: z.string(),
  issue_status: z.string(),
}).loose();

const SquadMemberStatusSchema = z.object({
  member_type: z.string(),
  member_id: z.string(),
  status: z.string().nullable().optional().transform((v) => v ?? null),
  active_issues: z.array(SquadActiveIssueBriefSchema).default([]),
  last_active_at: z.string().nullable().optional().transform((v) => v ?? null),
}).loose();

export const SquadMemberStatusListResponseSchema = z.object({
  members: z.array(SquadMemberStatusSchema).default([]),
}).loose();

export const EMPTY_SQUAD_MEMBER_STATUS_LIST = { members: [] };

// ---------------------------------------------------------------------------
// Structured error body — POST /api/workspaces/:wsId/issues 409 conflict.
//
// When the server detects an active issue with the same title in the same
// workspace, it returns `{ code: "active_duplicate_issue", error, issue }`
// instead of letting the create through. The UI uses the embedded issue ref
// to offer "view existing" rather than dropping the user into a generic
// "create failed" toast.
//
// Strict guarantees:
//   - `code` is a literal so a future server rename (e.g. `duplicate_issue`)
//     fails the parse and falls back to a normal error toast — drift never
//     ships as a broken duplicate UI.
//   - `issue` is required; without an id/identifier/title the "view existing"
//     button has nothing to point at, so we'd rather fall back than guess.
//   - `issue.status` is intentionally OMITTED: the duplicate toast doesn't
//     render a StatusIcon (which has no fallback for unknown enum values),
//     so a future server-side rename of `status` must not knock this branch
//     out. `.loose()` lets the field pass through unchanged for any other
//     consumer.
// ---------------------------------------------------------------------------

export const DuplicateIssueErrorBodySchema = z.object({
  code: z.literal("active_duplicate_issue"),
  error: z.string().optional(),
  issue: z.object({
    id: z.string(),
    identifier: z.string(),
    title: z.string(),
  }).loose(),
}).loose();

export interface DuplicateIssueErrorBody {
  code: "active_duplicate_issue";
  error?: string;
  issue: {
    id: string;
    identifier: string;
    title: string;
  };
}

// ---------------------------------------------------------------------------
// Webhook delivery schemas — backing the Autopilot Deliveries section. Enums
// (`status`, `signature_status`, `provider`) are kept as `z.string()` so a
// future server-side value (e.g. a Stripe provider, a new dedupe state)
// degrades to a generic UI fallback rather than collapsing the list into
// the empty array. `.loose()` lets unknown fields pass through, matching
// the rule used by every other endpoint here.
// ---------------------------------------------------------------------------

const WebhookDeliverySchema = z.object({
  id: z.string(),
  workspace_id: z.string(),
  autopilot_id: z.string(),
  trigger_id: z.string(),
  provider: z.string(),
  event: z.string(),
  dedupe_key: z.string().nullable(),
  dedupe_source: z.string().nullable(),
  signature_status: z.string(),
  status: z.string(),
  attempt_count: z.number().default(0),
  content_type: z.string().nullable(),
  response_status: z.number().nullable(),
  autopilot_run_id: z.string().nullable(),
  replayed_from_delivery_id: z.string().nullable(),
  error: z.string().nullable(),
  received_at: z.string(),
  last_attempt_at: z.string(),
  created_at: z.string(),
  // Detail-only fields. The list endpoint omits them; the detail endpoint
  // populates raw_body / selected_headers / response_body.
  selected_headers: z.record(z.string(), z.unknown()).nullable().optional(),
  raw_body: z.string().nullable().optional(),
  response_body: z.string().nullable().optional(),
}).loose();

export const ListWebhookDeliveriesResponseSchema = z.object({
  deliveries: z.array(WebhookDeliverySchema).default([]),
  total: z.number().default(0),
}).loose();

export const WebhookDeliveryResponseSchema = WebhookDeliverySchema;

export const EMPTY_LIST_WEBHOOK_DELIVERIES_RESPONSE: ListWebhookDeliveriesResponse = {
  deliveries: [],
  total: 0,
};

export const EMPTY_WEBHOOK_DELIVERY: WebhookDelivery = {
  id: "",
  workspace_id: "",
  autopilot_id: "",
  trigger_id: "",
  provider: "",
  event: "",
  dedupe_key: null,
  dedupe_source: null,
  signature_status: "not_required",
  status: "queued",
  attempt_count: 0,
  content_type: null,
  response_status: null,
  autopilot_run_id: null,
  replayed_from_delivery_id: null,
  error: null,
  received_at: "",
  last_attempt_at: "",
  created_at: "",
};

// ---------------------------------------------------------------------------
// User (`/api/me` GET + PATCH). The auth store and Settings → Account both
// trust this shape — a drift here would knock both surfaces out. Kept
// lenient by the same rules as IssueSchema: enums stay `z.string()`,
// nullable fields are unioned with `null`, unknown server fields pass
// through via `.loose()`. `profile_description` is the field added in
// MUL-2406; the server emits `""` when unset (NOT NULL DEFAULT ''), so
// the schema defaults to `""` too — keeps the type tight without
// breaking older backends that don't return the column yet.
// ---------------------------------------------------------------------------

export const UserSchema = z.object({
  id: z.string(),
  name: z.string().default(""),
  email: z.string().default(""),
  avatar_url: z.string().nullable().default(null),
  onboarded_at: z.string().nullable().default(null),
  onboarding_questionnaire: z.record(z.string(), z.unknown()).default({}),
  starter_content_state: z.string().nullable().default(null),
  language: z.string().nullable().default(null),
  profile_description: z.string().default(""),
  created_at: z.string().default(""),
  updated_at: z.string().default(""),
}).loose();

export const EMPTY_USER: User = {
  id: "",
  name: "",
  email: "",
  avatar_url: null,
  onboarded_at: null,
  onboarding_questionnaire: {},
  starter_content_state: null,
  language: null,
  profile_description: "",
  created_at: "",
  updated_at: "",
};