/- Copyright (c) 2026 Sovereign Research Stack. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Authors: Research Stack Team

RcloneIntegration.lean — Cloud Storage Operations in Lean

This module formalizes Rclone cloud storage operations for the swarm system.
Supports sync, copy, list, and other Rclone operations across various cloud
storage providers (Google Drive, Dropbox, S3, etc.).

Per AGENTS.md §1.4: Q16_16 fixed-point for scoring.
Per AGENTS.md §2: PascalCase types, camelCase functions.
Per AGENTS.md §4: Eval witnesses and theorems required.

Integration with SubagentOrchestrator: Rclone operations as domain tasks.
-/

import Mathlib.Data.Nat.Basic
import Mathlib.Data.Real.Basic
import Mathlib.Data.Fin.Basic
import Mathlib.Data.List.Basic
import Mathlib.Tactic

namespace Semantics.RcloneIntegration

-- ═══════════════════════════════════════════════════════════════════════════
-- §0  Fixed-Point Scoring (Q16.16)
-- ═══════════════════════════════════════════════════════════════════════════

structure Q16_16 where
  raw : Int
  deriving Repr, DecidableEq, Inhabited, BEq

namespace Q16_16

def zero : Q16_16 := ⟨0⟩
def one : Q16_16 := ⟨65536⟩
def ofNat (n : Nat) : Q16_16 := ⟨n * 65536⟩

instance : LE Q16_16 := ⟨fun a b => a.raw ≤ b.raw⟩
instance : LT Q16_16 := ⟨fun a b => a.raw < b.raw⟩
instance : DecidableRel (fun a b : Q16_16 => a ≤ b) := fun a b => inferInstanceAs (Decidable (a.raw ≤ b.raw))
instance : DecidableRel (fun a b : Q16_16 => a < b) := fun a b => inferInstanceAs (Decidable (a.raw < b.raw))
instance : Add Q16_16 := ⟨fun a b => ⟨a.raw + b.raw⟩⟩
instance : Sub Q16_16 := ⟨fun a b => ⟨a.raw - b.raw⟩⟩
instance : Mul Q16_16 := ⟨fun a b => ⟨(a.raw * b.raw) / 65536⟩⟩
instance : Div Q16_16 := ⟨fun a b => ⟨(a.raw * 65536) / b.raw⟩⟩

end Q16_16

-- ═══════════════════════════════════════════════════════════════════════════
-- §1  Cloud Storage Providers
-- ═══════════════════════════════════════════════════════════════════════════

inductive RcloneProvider
  | googleDrive
  | dropbox
  | amazonS3
  | googleCloudStorage
  | azureBlob
  | oneDrive
  | mega
  | ftp
  | sftp
  | webdav
  | localStorage
  deriving Repr, DecidableEq, Inhabited

namespace RcloneProvider

def toString : RcloneProvider → String
  | googleDrive => "drive"
  | dropbox => "dropbox"
  | amazonS3 => "s3"
  | googleCloudStorage => "gcs"
  | azureBlob => "azureblob"
  | oneDrive => "onedrive"
  | mega => "mega"
  | ftp => "ftp"
  | sftp => "sftp"
  | webdav => "webdav"
  | localStorage => "local"

end RcloneProvider

-- ═══════════════════════════════════════════════════════════════════════════
-- §2  Rclone Operations
-- ═══════════════════════════════════════════════════════════════════════════

inductive RcloneOperation
  | sync
  | copy
  | move
  | list
  | mount
  | umount
  | delete
  | purge
  | check
  | md5sum
  | size
  deriving Repr, DecidableEq, Inhabited

namespace RcloneOperation

def toString : RcloneOperation → String
  | sync => "sync"
  | copy => "copy"
  | move => "move"
  | list => "list"
  | mount => "mount"
  | umount => "umount"
  | delete => "delete"
  | purge => "purge"
  | check => "check"
  | md5sum => "md5sum"
  | size => "size"

end RcloneOperation

-- ═══════════════════════════════════════════════════════════════════════════
-- §3  Task Status
-- ═══════════════════════════════════════════════════════════════════════════

inductive TaskStatus
  | pending
  | inProgress
  | completed
  | failed
  deriving Repr, DecidableEq, Inhabited

namespace TaskStatus

def toString : TaskStatus → String
  | pending => "pending"
  | inProgress => "in_progress"
  | completed => "completed"
  | failed => "failed"

end TaskStatus

-- ═══════════════════════════════════════════════════════════════════════════
-- §4  Rclone Task Request
-- ═══════════════════════════════════════════════════════════════════════════

structure RcloneTaskRequest where
  taskId : String
  provider : RcloneProvider
  operation : RcloneOperation
  source : String
  destination : String
  options : List (String × String)
  priority : Nat
  dryRun : Bool
  deriving Repr, Inhabited

-- ═══════════════════════════════════════════════════════════════════════════
-- §5  Rclone Task Result
-- ═══════════════════════════════════════════════════════════════════════════

structure RcloneTaskResult where
  taskId : String
  operation : RcloneOperation
  provider : RcloneProvider
  source : String
  destination : String
  dryRun : Bool
  returnCode : Nat
  stdout : String
  stderr : String
  duration : Q16_16
  success : Bool
  filesTransferred : Nat
  bytesTransferred : Nat
  deriving Repr, Inhabited

-- ═══════════════════════════════════════════════════════════════════════════
-- §6  Task Queue
-- ═══════════════════════════════════════════════════════════════════════════

structure RcloneTaskQueue where
  tasks : List RcloneTaskRequest
  pending : List RcloneTaskRequest
  inProgress : List RcloneTaskRequest
  completed : List RcloneTaskResult
  deriving Repr, Inhabited

namespace RcloneTaskQueue

def empty : RcloneTaskQueue :=
  { tasks := [], pending := [], inProgress := [], completed := [] }

def addTask (queue : RcloneTaskQueue) (task : RcloneTaskRequest) : RcloneTaskQueue :=
  { queue with tasks := task :: queue.tasks, pending := task :: queue.pending }

def startTask (queue : RcloneTaskQueue) (taskId : String) : RcloneTaskQueue :=
  let (toStart, remaining) := queue.pending.partition (fun t => t.taskId = taskId)
  { queue with pending := remaining, inProgress := toStart ++ queue.inProgress }

def completeTask (queue : RcloneTaskQueue) (result : RcloneTaskResult) : RcloneTaskQueue :=
  let (_finished, remaining) := queue.inProgress.partition (fun t => t.taskId = result.taskId)
  { queue with inProgress := remaining, completed := result :: queue.completed }

end RcloneTaskQueue

-- ═══════════════════════════════════════════════════════════════════════════
-- §7  Integration with SubagentOrchestrator
-- ═══════════════════════════════════════════════════════════════════════════

structure RcloneDomainExpert where
  provider : RcloneProvider
  expertiseLevel : Q16_16
  operationsKnown : List RcloneOperation
  deriving Repr, Inhabited

def createRcloneExpert (provider : RcloneProvider) : RcloneDomainExpert :=
  { provider := provider
    expertiseLevel := Q16_16.one
    operationsKnown := [RcloneOperation.sync, RcloneOperation.copy, RcloneOperation.list, RcloneOperation.delete] }

-- ═══════════════════════════════════════════════════════════════════════════
-- §8  Theorems
-- ═══════════════════════════════════════════════════════════════════════════

theorem addTaskPreservesCount (queue : RcloneTaskQueue) (task : RcloneTaskRequest) :
    (queue.addTask task).tasks.length = queue.tasks.length + 1 := by
  simp [RcloneTaskQueue.addTask]

theorem addTaskPreservesPendingLength (queue : RcloneTaskQueue) (task : RcloneTaskRequest) :
    (queue.addTask task).pending.length = queue.pending.length + 1 := by
  simp [RcloneTaskQueue.addTask]

/--
Starting a task moves matching entries from pending to inProgress.
After starting, pending shrinks (non-increasing).
-/
theorem startTask_pending_non_increasing (queue : RcloneTaskQueue) (taskId : String) :
    (queue.startTask taskId).pending.length ≤ queue.pending.length := by
  simp only [RcloneTaskQueue.startTask, List.partition_eq_filter_filter]
  -- After simp, the pending field becomes (filter (not ∘ p) queue.pending).
  -- filter_sublist states that (filter p l) is a sublist of l.
  exact List.Sublist.length_le List.filter_sublist

/--
Completing a task adds one entry to completed results.
-/
theorem completeTask_completed_length (queue : RcloneTaskQueue) (result : RcloneTaskResult) :
    (queue.completeTask result).completed.length = queue.completed.length + 1 := by
  simp [RcloneTaskQueue.completeTask]

-- ═══════════════════════════════════════════════════════════════════════════
-- §9  Topological Storage Area
-- ═══════════════════════════════════════════════════════════════════════════

structure TopologicalStorageArea where
  provider : RcloneProvider
  mountPoint : String
  isPrimary : Bool
  deriving Repr, Inhabited

def topologicalStorageArea : TopologicalStorageArea :=
  { provider := RcloneProvider.googleDrive
    mountPoint := "gdrive:topological_storage"
    isPrimary := true }

end Semantics.RcloneIntegration
