import { z } from 'zod'

/**
 * Accepts every date-ish string the app produces and normalizes to a
 * full RFC 3339 datetime so downstream `.datetime()` validation passes.
 *
 * - `""`, `null`, `undefined` → `null` (treat as unset)
 * - `"YYYY-MM-DD"` (HTML date input) → `"YYYY-MM-DDT00:00:00.000Z"`
 * - `"YYYY-MM-DDTHH:MM"` (datetime-local input) → ISO string in UTC
 * - `"YYYY-MM-DDTHH:MM:SS"` and full RFC 3339 → unchanged / normalised
 * - Anything `new Date()` can parse → its ISO form
 * - Unparseable → passed through so Zod rejects it
 *
 * Returns a Zod schema that produces a `string | null` (after preprocess +
 * `.datetime().nullable()`).
 */
export const flexibleDateTime = () =>
  z.preprocess(
    (val) => {
      if (val === null || val === undefined || val === '') return null
      if (typeof val !== 'string') return val
      // Already full ISO datetime? Pass through.
      if (/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?([+-]\d{2}:?\d{2}|Z)$/.test(val)) {
        return val
      }
      // Try Date parsing for everything else (date-only, datetime-local, etc).
      const d = new Date(val)
      if (Number.isNaN(d.getTime())) return val // let Zod reject
      return d.toISOString()
    },
    z.string().datetime().nullable(),
  )

// ─── Auth ────────────────────────────────────────────────────────────────────

export const signInSchema = z.object({
  email: z.string().email('Invalid email address'),
  password: z.string().min(1, 'Password is required'),
})

export const signUpSchema = z.object({
  email: z.string().email('Invalid email address'),
  password: z.string().min(8, 'Password must be at least 8 characters'),
  fullName: z.string().min(1, 'Full name is required').max(100, 'Name is too long'),
  action: z.enum(['create', 'join']),
  spaceName: z.string().max(100).optional(),
  spaceSlug: z.string().regex(/^[a-z0-9]+$/, 'Slug must be lowercase letters and numbers only').max(50).optional(),
  city: z.string().max(100).optional(),
  inviteCode: z.string().max(20).optional(),
})

export const createSpaceSchema = z.object({
  spaceName: z.string().min(1, 'Space name is required').max(100, 'Name is too long'),
  spaceSlug: z.string().min(1, 'Slug is required').max(50).regex(/^[a-z0-9]+$/, 'Slug must be lowercase letters and numbers only'),
  spaceCity: z.string().max(100).optional(),
  displayName: z.string().min(1, 'Display name is required').max(100),
})

export const joinSpaceSchema = z.object({
  inviteCode: z.string().min(1, 'Invite code is required').max(20),
  displayName: z.string().min(1, 'Display name is required').max(100),
})

// ─── Tasks ───────────────────────────────────────────────────────────────────

export const createTaskSchema = z.object({
  title: z.string().min(1, 'Title is required').max(200, 'Title is too long'),
  description: z.string().max(2000, 'Description is too long').optional(),
  type: z.enum(['task', 'chore']).default('task'),
  area: z.string().max(100).optional(),
  recurrence: z.enum(['none', 'daily', 'weekly', 'biweekly', 'monthly']).default('none'),
  due_date: flexibleDateTime().optional(),
})

export const taskIdSchema = z.string().uuid('Invalid task ID')

// ─── Projects ────────────────────────────────────────────────────────────────

export const createProjectSchema = z.object({
  title: z.string().min(1, 'Title is required').max(200),
  description: z.string().max(2000).optional(),
  area: z.string().max(100).optional(),
  tags: z.array(z.string().max(50)).max(20).optional(),
  due_date: flexibleDateTime().optional(),
})

export const updateProjectStatusSchema = z.object({
  projectId: z.string().uuid('Invalid project ID'),
  status: z.enum(['backlog', 'in_progress', 'review', 'done', 'blocked']),
})

// ─── Members ─────────────────────────────────────────────────────────────────

export const addMemberSchema = z.object({
  email: z.string().email('Invalid email address'),
  display_name: z.string().min(1, 'Display name is required').max(100),
  phone: z.string().max(20).optional().nullable(),
  handle: z.string().max(50).optional().nullable(),
  role: z.enum(['admin', 'board', 'treasurer', 'member', 'associate']).default('member'),
  tier: z.enum(['plus', 'basic', 'associate']).default('basic'),
  joined_at: flexibleDateTime().optional(),
  has_card_access: z.boolean().optional(),
})

export const updateMemberSchema = z.object({
  memberId: z.string().uuid('Invalid member ID'),
  display_name: z.string().min(1).max(100).optional(),
  email: z.string().email().optional(),
  phone: z.string().max(20).optional().nullable(),
  handle: z.string().max(50).optional().nullable(),
  role: z.enum(['admin', 'board', 'treasurer', 'member', 'associate']).optional(),
  tier: z.enum(['plus', 'basic', 'associate']).optional(),
  status: z.enum(['current', 'unverified', 'late', 'inactive']).optional(),
  has_card_access: z.boolean().optional(),
  payment_status: z.string().max(50).optional().nullable(),
  payment_note: z.string().max(500).optional().nullable(),
})

// ─── Contacts ────────────────────────────────────────────────────────────────

export const createContactSchema = z.object({
  name: z.string().min(1, 'Name is required').max(200),
  contact_type: z.enum(['vendor', 'supplier', 'partner', 'landlord', 'city']),
  email: z.string().email().optional().nullable(),
  phone: z.string().max(20).optional().nullable(),
  details: z.string().max(500).optional().nullable(),
  note: z.string().max(2000).optional().nullable(),
  group_label: z.string().max(100).optional().nullable(),
  tags: z.array(z.string().max(50)).max(10).optional(),
  code: z.string().max(50).optional().nullable(),
})

export const updateContactSchema = createContactSchema.partial().extend({
  contactId: z.string().uuid('Invalid contact ID'),
})

// ─── Knowledge Base ──────────────────────────────────────────────────────────

export const createKbEntrySchema = z.object({
  title: z.string().min(1, 'Title is required').max(200),
  content: z.string().min(1, 'Content is required').max(50000),
  area: z.string().max(100).optional().nullable(),
  visibility: z.enum(['all_members', 'board', 'admin_only']).default('all_members'),
  is_pinned: z.boolean().default(false),
  tags: z.array(z.string().max(50)).max(20).optional(),
  icon: z.string().max(10).optional().nullable(),
})

export const updateKbEntrySchema = createKbEntrySchema.partial().extend({
  entryId: z.string().uuid('Invalid entry ID'),
})

// ─── Secrets ─────────────────────────────────────────────────────────────────

export const createSecretSchema = z.object({
  title: z.string().min(1, 'Title is required').max(200),
  value: z.string().min(1, 'Value is required').max(5000),
  description: z.string().max(500).optional().nullable(),
  area: z.string().max(100).optional().nullable(),
  icon: z.string().max(10).optional().nullable(),
})

// ─── Payments ────────────────────────────────────────────────────────────────

export const logCashPaymentSchema = z.object({
  amount: z.number().positive('Amount must be positive'),
  from_note: z.string().min(1, 'Payer note is required').max(500),
  member_id: z.string().uuid('Invalid member ID').optional().nullable(),
  transaction_date: flexibleDateTime().optional(),
})

export const linkPaymentSchema = z.object({
  paymentId: z.string().uuid('Invalid payment ID'),
  memberId: z.string().uuid('Invalid member ID'),
})

// ─── Settings ────────────────────────────────────────────────────────────────

export const updateSpaceSettingsSchema = z.object({
  name: z.string().min(1).max(100).optional(),
  slug: z.string().regex(/^[a-z0-9]+$/, 'Slug must be lowercase letters and numbers only').max(50).optional(),
  city: z.string().max(100).optional().nullable(),
  require_approval: z.boolean().optional(),
  public_member_directory: z.boolean().optional(),
  mission_statement: z.string().max(5000).optional().nullable(),
})

export const saveIntegrationSchema = z.object({
  platform: z.string().min(1).max(50),
  config: z.record(z.string().max(500)),
})

// ─── Area Leads ──────────────────────────────────────────────────────────────

export const upsertAreaLeadSchema = z.object({
  area_code: z.string().min(1, 'Area code is required').max(50),
  area_name: z.string().min(1, 'Area name is required').max(100),
  lead_id: z.string().uuid().optional().nullable(),
  lead_handle: z.string().max(100).optional().nullable(),
  status: z.enum(['active', 'vacant', 'handoff']).default('active'),
})

// ─── Governance: proposals ───────────────────────────────────────────────────

export const proposalTypes = ['bylaw_change','board_action','membership_vote','advisory_poll','recall','budget'] as const
export const proposalStatuses = ['draft','open','decided','withdrawn','expired'] as const
export const thresholdRules = ['simple_majority','two_thirds','three_fourths','unanimous'] as const
export const votePositions = ['yes','no','abstain','recused'] as const

export const createProposalSchema = z.object({
  title: z.string().min(1, 'Title is required').max(200, 'Title is too long'),
  body: z.string().max(20000).default(''),
  proposal_type: z.enum(proposalTypes).default('advisory_poll'),
  threshold: z.enum(thresholdRules).optional(),
  policy_ref_id: z.string().uuid().optional().nullable(),
  parent_incident_id: z.string().uuid().optional().nullable(),
  voting_opens_at: flexibleDateTime().optional(),
  voting_closes_at: flexibleDateTime().optional(),
  open_immediately: z.boolean().optional(),
})

export const openProposalSchema = z.object({
  proposalId: z.string().uuid('Invalid proposal ID'),
  voting_closes_at: flexibleDateTime().optional(),
})

export const castVoteSchema = z.object({
  proposalId: z.string().uuid('Invalid proposal ID'),
  position: z.enum(votePositions),
  recusal_reason: z.string().max(1000).optional().nullable(),
  comment: z.string().max(2000).optional().nullable(),
}).refine(
  v => v.position !== 'recused' || (v.recusal_reason && v.recusal_reason.trim().length > 0),
  { message: 'Recusal requires a reason', path: ['recusal_reason'] },
)

export const decideProposalSchema = z.object({
  proposalId: z.string().uuid('Invalid proposal ID'),
})

export const withdrawProposalSchema = z.object({
  proposalId: z.string().uuid('Invalid proposal ID'),
})

// ─── Governance: incidents ───────────────────────────────────────────────────

export const incidentSeverities = ['low','medium','high','critical'] as const
export const incidentStatuses = ['received','under_review','decided','appealed','closed'] as const
export const incidentUpdateVisibilities = ['reporter_only','all_parties','board_only'] as const

export const fileIncidentSchema = z.object({
  title: z.string().min(1, 'Title is required').max(200),
  body: z.string().min(1, 'Description is required').max(20000),
  category: z.string().max(50).default('general'),
  severity: z.enum(incidentSeverities).default('medium'),
  subjects: z.array(z.string().uuid()).max(20).optional(),
  is_anonymous: z.boolean().optional(),
})

export const updateIncidentStatusSchema = z.object({
  incidentId: z.string().uuid('Invalid incident ID'),
  status: z.enum(incidentStatuses),
  disposition: z.string().max(20000).optional().nullable(),
})

export const addIncidentUpdateSchema = z.object({
  incidentId: z.string().uuid('Invalid incident ID'),
  body: z.string().min(1, 'Update body is required').max(20000),
  visibility: z.enum(incidentUpdateVisibilities).default('all_parties'),
})

export const appealIncidentSchema = z.object({
  incidentId: z.string().uuid('Invalid incident ID'),
  title: z.string().min(1).max(200),
  body: z.string().max(20000).default(''),
})

// ─── Governance: policies ────────────────────────────────────────────────────

export const policyStatuses = ['draft','active','deprecated','superseded'] as const

export const createPolicySchema = z.object({
  slug: z.string().min(1, 'Slug is required').max(80).regex(/^[a-z0-9-]+$/, 'Slug must be lowercase letters, numbers, and hyphens only'),
  title: z.string().min(1, 'Title is required').max(200),
  section_ref: z.string().max(80).optional().nullable(),
  parent_policy_id: z.string().uuid().optional().nullable(),
  body_formal: z.string().max(100000).default(''),
  body_plain: z.string().max(100000).optional().nullable(),
  effective_at: flexibleDateTime().optional(),
})

export const supersedePolicySchema = z.object({
  policyId: z.string().uuid('Invalid policy ID'),
  body_formal: z.string().max(100000).default(''),
  body_plain: z.string().max(100000).optional().nullable(),
  section_ref: z.string().max(80).optional().nullable(),
  title: z.string().min(1).max(200).optional(),
  adopted_by_proposal_id: z.string().uuid().optional().nullable(),
  effective_at: flexibleDateTime().optional(),
})

export const updatePolicyStatusSchema = z.object({
  policyId: z.string().uuid('Invalid policy ID'),
  status: z.enum(policyStatuses),
})

// ─── Member self-profile and COI ─────────────────────────────────────────────

export const updateMyProfileSchema = z.object({
  display_name: z.string().min(1).max(100).optional(),
  handle: z.string().max(50).optional().nullable(),
  phone: z.string().max(20).optional().nullable(),
  skills: z.array(z.string().min(1).max(60)).max(40).optional(),
  interests: z.array(z.string().min(1).max(60)).max(40).optional(),
  willing_to: z.array(z.string().min(1).max(60)).max(20).optional(),
})

export const discloseAffiliationsSchema = z.object({
  affiliations: z.array(z.string().min(1).max(200)).max(50).default([]),
})

// ─── Space settings (visibility) ─────────────────────────────────────────────

export const financialVisibilities = ['treasurer_only', 'board_visible', 'all_members_visible'] as const
export const directoryVisibilities = [
  'board_only',
  'member_count_visible',
  'members_visible',
  'public_members_visible',
] as const

export const updateSpaceVisibilitySchema = z.object({
  financial_visibility: z.enum(financialVisibilities).optional(),
  member_directory_visibility: z.enum(directoryVisibilities).optional(),
})

// ─── Knowledge base meeting minutes ─────────────────────────────────────────

export const meetingMinutesSchema = z.object({
  entryId: z.string().uuid('Invalid entry ID'),
  is_meeting_minutes: z.boolean().default(true),
  meeting_date: flexibleDateTime().optional(),
})

// ─── Areas ───────────────────────────────────────────────────────────────────

export const createAreaSchema = z.object({
  code: z
    .string()
    .min(1, 'Code is required')
    .max(40)
    .regex(/^[a-z0-9-]+$/, 'Code must be lowercase letters, numbers, and hyphens only'),
  name: z.string().min(1, 'Name is required').max(80),
  icon: z.string().max(20).optional().nullable(),
  sort_order: z.number().int().min(0).max(100000).optional(),
})

export const updateAreaSchema = z.object({
  areaId: z.string().uuid('Invalid area ID'),
  name: z.string().min(1).max(80).optional(),
  icon: z.string().max(20).optional().nullable(),
  sort_order: z.number().int().min(0).max(100000).optional(),
  is_archived: z.boolean().optional(),
})

// ─── Generic ID schemas ──────────────────────────────────────────────────────

export const uuidSchema = z.string().uuid('Invalid ID format')

// Helper type exports
export type CreateTaskInput = z.infer<typeof createTaskSchema>
export type CreateProjectInput = z.infer<typeof createProjectSchema>
export type CreateContactInput = z.infer<typeof createContactSchema>
export type CreateKbEntryInput = z.infer<typeof createKbEntrySchema>
export type CreateSecretInput = z.infer<typeof createSecretSchema>