/**
 * Zod Validation Schemas
 * Constitutional Principle III: Local Execution Security
 * Constitutional Principle IV: Defensive Programming
 */

import { z } from 'zod';

/**
 * Common validation patterns
 */

// Vault name validation (alphanumeric, spaces, hyphens, underscores)
export const vaultNameSchema = z
  .string()
  .min(1, 'Vault name cannot be empty')
  .max(255, 'Vault name too long')
  .regex(/^[a-zA-Z0-9\s_-]+$/, 'Vault name contains invalid characters');

// Note name validation (allow most characters, but not path separators)
export const noteNameSchema = z
  .string()
  .min(1, 'Note name cannot be empty')
  .max(255, 'Note name too long')
  .regex(/^[^/\\]+$/, 'Note name cannot contain path separators');

// File path validation (allow subdirectories)
export const filePathSchema = z
  .string()
  .min(1, 'File path cannot be empty')
  .max(1024, 'File path too long')
  .regex(/^[^<>:"|?*]+$/, 'File path contains invalid characters');

// Content validation (allow any string, but limit size)
export const contentSchema = z
  .string()
  .max(1048576, 'Content too large (max 1MB)'); // 1MB limit

// Tag validation (must start with #)
export const tagSchema = z
  .string()
  .min(2, 'Tag too short')
  .regex(/^#[a-zA-Z0-9_/-]+$/, 'Invalid tag format (must start with # and contain only alphanumeric, _, /, -)');

// Property key validation
export const propertyKeySchema = z
  .string()
  .min(1, 'Property key cannot be empty')
  .max(100, 'Property key too long')
  .regex(/^[a-zA-Z0-9_-]+$/, 'Property key contains invalid characters');

// Boolean flag validation
export const booleanFlagSchema = z
  .union([z.boolean(), z.string()])
  .transform((val) => {
    if (typeof val === 'boolean') return val;
    return val.toLowerCase() === 'true' || val === '1';
  });

// Optional string that can be undefined or empty
export const optionalStringSchema = z.string().optional();

// Date string validation (ISO 8601)
export const dateSchema = z
  .string()
  .regex(/^\d{4}-\d{2}-\d{2}(T\d{2}:\d{2}:\d{2}(\.\d{3})?Z?)?$/, 'Invalid date format (use ISO 8601)');

/**
 * Common parameter schemas
 */

// File identifier (either file name or full path)
export const fileIdentifierSchema = z.object({
  file: z.string().optional(),
  path: z.string().optional(),
}).refine(
  (data) => data.file || data.path,
  { message: 'Either file or path must be provided' }
);

// Pagination parameters
export const paginationSchema = z.object({
  limit: z.number().int().positive().max(1000).optional(),
  offset: z.number().int().nonnegative().optional(),
});

// Format options
export const formatSchema = z.object({
  format: z.enum(['json', 'tsv', 'csv', 'text']).optional().default('text'),
});

/**
 * Tool-specific schemas
 */

// Create note parameters
export const createNoteSchema = z.object({
  name: noteNameSchema,
  path: filePathSchema.optional(),
  content: contentSchema.optional(),
  template: z.string().optional(),
  overwrite: booleanFlagSchema.optional(),
  open: booleanFlagSchema.optional(),
});

// Read note parameters
export const readNoteSchema = z.union([
  z.object({ file: noteNameSchema }),
  z.object({ path: filePathSchema }),
]).refine(
  (data) => ('file' in data && data.file) || ('path' in data && data.path),
  { message: 'Either file or path must be provided' }
);

// Append/Prepend parameters
export const appendPrependSchema = z.intersection(
  fileIdentifierSchema,
  z.object({
    content: contentSchema,
    inline: booleanFlagSchema.optional(),
  })
);

// Delete note parameters
export const deleteNoteSchema = z.intersection(
  fileIdentifierSchema,
  z.object({
    permanent: booleanFlagSchema.optional(),
  })
);

// Move/Rename parameters
export const moveRenameSchema = z.intersection(
  fileIdentifierSchema,
  z.object({
    newPath: filePathSchema.optional(),
    newName: noteNameSchema.optional(),
  })
).refine(
  (data) => data.newPath || data.newName,
  { message: 'Either newPath or newName must be provided' }
);

// Search parameters
export const searchSchema = z.object({
  query: z.string().min(1, 'Search query cannot be empty'),
  path: optionalStringSchema, // Folder path to limit search
  limit: z.number().int().positive().max(1000).optional(),
  total: booleanFlagSchema.optional(), // Return match count instead of files
  case: booleanFlagSchema.optional(), // Case sensitive search
  format: z.enum(['text', 'json']).optional().default('text'),
});

// Tag search parameters
export const tagSearchSchema = z.object({
  tag: tagSchema,
  ...formatSchema.shape,
});

// Property parameters
export const propertySchema = z.intersection(
  fileIdentifierSchema,
  z.object({
    key: propertyKeySchema,
    value: z.unknown().optional(),
  })
);