generator client {
  provider      = "prisma-client-js"
  binaryTargets = ["native", "linux-musl-openssl-3.0.x", "linux-musl-arm64-openssl-3.0.x"]
}

datasource db {
  provider  = "postgresql"
  url       = env("DATABASE_URL")
  directUrl = env("DIRECT_DATABASE_URL")
}

// ============================================
// CORE MODELS
// ============================================

model User {
  id String @id @default(uuid())

  // Credentials
  email    String     @unique
  password String?
  type     AuthMethod

  // Relations
  memberships Membership[]

  // Timestamps
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@map("users")
}

model Project {
  id String @id @default(uuid())

  // Details
  name String

  // API
  public String @unique
  secret String @unique

  // Admin
  disabled Boolean @default(false)

  // Billing
  customer     String? @unique
  subscription String? @unique

  // Billing Limits (per calendar month, null = unlimited)
  billingLimitWorkflows     Int? // Max workflow emails per month
  billingLimitCampaigns     Int? // Max campaign emails per month
  billingLimitTransactional Int? // Max transactional emails per month

  // Email Tracking
  tracking TrackingMode @default(ENABLED) // Open and click tracking mode

  // Relations
  members     Membership[]
  contacts    Contact[]
  templates   Template[]
  segments    Segment[]
  workflows   Workflow[]
  campaigns   Campaign[]
  emails      Email[]
  events      Event[]
  domains     Domain[]
  apiRequests ApiRequest[]

  // Timestamps
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@map("projects")
}

model Membership {
  user      User    @relation(fields: [userId], references: [id])
  userId    String
  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)
  projectId String

  // Details
  role Role @default(MEMBER)

  // Timestamps
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@id([userId, projectId])
  @@map("memberships")
}

model Domain {
  id String @id @default(uuid())

  // Domain details
  domain   String
  verified Boolean @default(false)

  // DKIM tokens for DNS verification
  dkimTokens Json? // Array of DKIM token strings

  // Relations
  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)
  projectId String

  // Timestamps
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@unique([projectId, domain])
  @@index([projectId])
  @@index([projectId, verified])
  @@map("domains")
}

// ============================================
// CONTACTS & TEMPLATES
// ============================================

model Contact {
  id String @id @default(uuid())

  // Details
  email String
  data  Json? // Custom fields: { firstName: "John", plan: "pro", ... }

  // Subscription
  subscribed Boolean @default(true)

  // Relations
  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)
  projectId String

  emails             Email[]
  workflowExecutions WorkflowExecution[]
  events             Event[]
  segmentMemberships SegmentMembership[]

  // Timestamps
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@unique([projectId, email])
  @@index([projectId])
  @@index([projectId, subscribed])
  @@index([data(ops: JsonbOps)], type: Gin) // GIN index for fast JSON queries on Contact.data
  @@map("contacts")
}

model Template {
  id String @id @default(uuid())

  // Details
  name        String
  description String?

  // Content
  subject  String
  body     String // HTML content with {{variable}} placeholders
  from     String
  fromName String?
  replyTo  String?

  // Type
  type TemplateType @default(MARKETING)

  // Relations
  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)
  projectId String

  emails        Email[]
  workflowSteps WorkflowStep[]

  // Timestamps
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@index([projectId])
  @@index([projectId, type])
  @@map("templates")
}

// ============================================
// SEGMENTS (Dynamic audience groups)
// ============================================

model Segment {
  id String @id @default(uuid())

  // Details
  name        String
  description String?

  // Filter condition (evaluated dynamically)
  condition Json
  // Nested filter structure with AND/OR logic:
  // {
  //   logic: "OR",
  //   groups: [
  //     {
  //       filters: [
  //         { field: "data.plan", operator: "equals", value: "VIP" },
  //         { field: "subscribed", operator: "equals", value: true }
  //       ]
  //     },
  //     {
  //       filters: [
  //         { field: "createdAt", operator: "within", value: 30, unit: "days" }
  //       ],
  //       conditions: {
  //         logic: "AND",
  //         groups: [...]
  //       }
  //     }
  //   ]
  // }
  // Operators: equals, notEquals, contains, greaterThan, lessThan, within, exists, etc.

  // Track membership changes (enables segment entry/exit events)
  trackMembership Boolean @default(false)

  // Stats (computed)
  memberCount Int @default(0)

  // Relations
  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)
  projectId String

  memberships SegmentMembership[]
  campaigns   Campaign[]

  // Timestamps
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@index([projectId])
  @@index([condition(ops: JsonbOps)], type: Gin) // GIN index for segment condition queries
  @@map("segments")
}

model SegmentMembership {
  // Relations
  contact   Contact @relation(fields: [contactId], references: [id], onDelete: Cascade)
  contactId String

  segment   Segment @relation(fields: [segmentId], references: [id], onDelete: Cascade)
  segmentId String

  // Membership tracking
  enteredAt DateTime  @default(now())
  exitedAt  DateTime? // null = currently in segment

  // Timestamps
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@id([contactId, segmentId])
  @@index([segmentId, exitedAt]) // Active members (exitedAt = null)
  @@index([contactId, exitedAt])
  @@index([enteredAt])
  @@map("segment_memberships")
}

// ============================================
// CAMPAIGNS (One-time broadcasts)
// ============================================

model Campaign {
  id String @id @default(uuid())

  // Details
  name        String
  description String?
  status      CampaignStatus @default(DRAFT)

  // Email content
  subject  String
  body     String  @db.Text
  from     String
  fromName String?
  replyTo  String?

  // Audience selection
  audienceType      CampaignAudienceType @default(ALL)
  audienceCondition Json? // For FILTERED: manual filter condition with AND/OR logic (same structure as Segment.condition)

  segment   Segment? @relation(fields: [segmentId], references: [id])
  segmentId String? // For SEGMENT: reference to saved segment

  // Scheduling
  scheduledFor DateTime?

  // Stats (computed)
  totalRecipients Int @default(0)
  sentCount       Int @default(0)
  deliveredCount  Int @default(0)
  openedCount     Int @default(0)
  clickedCount    Int @default(0)
  bouncedCount    Int @default(0)

  // Relations
  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)
  projectId String

  emails Email[]

  // Timestamps
  sentAt    DateTime?
  createdAt DateTime  @default(now())
  updatedAt DateTime  @updatedAt

  @@index([projectId, status])
  @@index([scheduledFor])
  @@index([segmentId])
  @@index([audienceCondition(ops: JsonbOps)], type: Gin) // GIN index for campaign audience condition queries
  @@map("campaigns")
}

// ============================================
// WORKFLOWS (Automated sequences)
// ============================================

model Workflow {
  id String @id @default(uuid())

  // Details
  name        String
  description String?
  enabled     Boolean @default(false)

  // Entry point
  triggerType   WorkflowTriggerType
  triggerConfig Json? // { eventName: "user.signup" } or { schedule: "0 9 * * *" }

  // Re-entry behavior
  allowReentry Boolean @default(false) // If true, contacts can enter workflow multiple times

  // Relations
  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)
  projectId String

  steps      WorkflowStep[]
  executions WorkflowExecution[]

  // Timestamps
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@index([projectId])
  @@index([projectId, enabled])
  @@map("workflows")
}

model WorkflowStep {
  id String @id @default(uuid())

  // Step details
  type     WorkflowStepType
  name     String
  position Json // { x: 100, y: 200 } for visual editor

  // Step configuration (flexible JSON)
  config Json
  // Examples by type:
  // TRIGGER: { eventName: "user.signup" }
  // SEND_EMAIL: { templateId: "uuid", from: "team@example.com" }
  // DELAY: { amount: 24, unit: "hours" }
  // WAIT_FOR_EVENT: { eventName: "email.clicked", timeout: 86400 }
  // CONDITION: { field: "contact.data.plan", operator: "equals", value: "pro" }
  // EXIT: { reason: "unsubscribed" }

  // Relations
  workflow   Workflow @relation(fields: [workflowId], references: [id], onDelete: Cascade)
  workflowId String

  template   Template? @relation(fields: [templateId], references: [id])
  templateId String? // For SEND_EMAIL steps

  // Graph connections
  outgoingTransitions WorkflowTransition[] @relation("FromStep")
  incomingTransitions WorkflowTransition[] @relation("ToStep")

  // Execution tracking
  executions                WorkflowStepExecution[]
  currentWorkflowExecutions WorkflowExecution[] // Executions currently on this step

  // Timestamps
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@index([workflowId])
  @@index([templateId])
  @@map("workflow_steps")
}

model WorkflowTransition {
  id String @id @default(uuid())

  // From -> To
  fromStep   WorkflowStep @relation("FromStep", fields: [fromStepId], references: [id], onDelete: Cascade)
  fromStepId String

  toStep   WorkflowStep @relation("ToStep", fields: [toStepId], references: [id], onDelete: Cascade)
  toStepId String

  // Conditional routing
  condition Json? // null = always follow, or { branch: "yes" } for condition steps
  priority  Int   @default(0) // Order to evaluate transitions

  // Timestamps
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@index([fromStepId])
  @@index([toStepId])
  @@map("workflow_transitions")
}

model WorkflowExecution {
  id String @id @default(uuid())

  // Relations
  workflow   Workflow @relation(fields: [workflowId], references: [id], onDelete: Cascade)
  workflowId String

  contact   Contact @relation(fields: [contactId], references: [id], onDelete: Cascade)
  contactId String

  // Execution state
  status WorkflowExecutionStatus @default(RUNNING)

  // Current position
  currentStep   WorkflowStep? @relation(fields: [currentStepId], references: [id])
  currentStepId String?

  // Exit information
  exitReason String?

  // Context data (merged with contact.data when executing)
  context Json? // Additional variables for this execution

  // Relations
  stepExecutions WorkflowStepExecution[]
  emails         Email[]

  // Timestamps
  startedAt   DateTime  @default(now())
  completedAt DateTime?

  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@index([workflowId, contactId]) // Index for querying executions by workflow and contact
  @@index([workflowId, status])
  @@index([contactId, status])
  @@index([status, currentStepId])
  @@map("workflow_executions")
}

model WorkflowStepExecution {
  id String @id @default(uuid())

  // Relations
  execution   WorkflowExecution @relation(fields: [executionId], references: [id], onDelete: Cascade)
  executionId String

  step   WorkflowStep @relation(fields: [stepId], references: [id], onDelete: Cascade)
  stepId String

  // Execution state
  status StepExecutionStatus @default(PENDING)

  // Delay/scheduling
  scheduledFor DateTime? // When this step should execute (for DELAY steps)
  executeAfter DateTime? // Don't execute before this time (for WAIT_FOR_EVENT timeout)

  // Result tracking
  output Json? // Step execution result
  error  String?

  // Relations
  emails Email[] // Emails sent by this step execution

  // Timestamps
  startedAt   DateTime?
  completedAt DateTime?

  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@index([executionId, status])
  @@index([stepId])
  @@index([status, scheduledFor]) // For delay queue processor
  @@index([scheduledFor])
  @@map("workflow_step_executions")
}

// ============================================
// EMAILS (Unified tracking for all sends)
// ============================================

model Email {
  id String @id @default(uuid())

  // Recipient
  contact   Contact @relation(fields: [contactId], references: [id], onDelete: Cascade)
  contactId String
  toName    String? // Recipient display name for To header

  // Content (denormalized for history)
  subject     String
  body        String // Rendered HTML
  from        String
  fromName    String?
  replyTo     String?
  headers     Json? // Custom email headers
  attachments Json? // Array of {filename: string, content: string (base64), contentType: string}

  // AWS SES Message ID (for tracking webhooks)
  messageId String? @unique

  // Source - identifies how this email was triggered
  sourceType EmailSourceType

  // Relations to source (one will be set based on sourceType)
  template   Template? @relation(fields: [templateId], references: [id])
  templateId String? // For TRANSACTIONAL

  campaign   Campaign? @relation(fields: [campaignId], references: [id], onDelete: Cascade)
  campaignId String? // For CAMPAIGN

  workflowExecution   WorkflowExecution? @relation(fields: [workflowExecutionId], references: [id], onDelete: Cascade)
  workflowExecutionId String? // For WORKFLOW

  workflowStepExecution   WorkflowStepExecution? @relation(fields: [workflowStepExecutionId], references: [id], onDelete: Cascade)
  workflowStepExecutionId String? // For WORKFLOW (specific step)

  // Delivery
  status EmailStatus @default(PENDING)

  // Event timestamps
  sentAt       DateTime?
  deliveredAt  DateTime?
  openedAt     DateTime? // First open
  clickedAt    DateTime? // First click
  bouncedAt    DateTime?
  complainedAt DateTime?

  // Event counts
  opens  Int @default(0)
  clicks Int @default(0)

  // Error tracking
  error String?

  // Relations
  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)
  projectId String

  events Event[]

  // Timestamps
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@index([projectId, contactId])
  @@index([contactId])
  @@index([campaignId])
  @@index([workflowExecutionId])
  @@index([workflowStepExecutionId])
  @@index([status])
  @@index([createdAt])
  @@index([projectId, sourceType, createdAt]) // For billing limit queries
  @@index([contactId, openedAt]) // For email activity segment queries
  @@index([contactId, clickedAt]) // For email activity segment queries
  @@index([contactId, bouncedAt]) // For email activity segment queries
  @@index([contactId, complainedAt]) // For email activity segment queries
  @@map("emails")
}

// ============================================
// EVENTS (Webhook tracking & workflow triggers)
// ============================================

model Event {
  id String @id @default(uuid())

  // Event details
  name String // e.g., "email.opened", "email.clicked", "user.signup"
  data Json? // Event payload

  // Relations
  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)
  projectId String

  contact   Contact? @relation(fields: [contactId], references: [id], onDelete: Cascade)
  contactId String?

  email   Email?  @relation(fields: [emailId], references: [id], onDelete: Cascade)
  emailId String?

  // Timestamps
  createdAt DateTime @default(now())

  @@index([projectId, name])
  @@index([contactId])
  @@index([emailId])
  @@index([createdAt])
  @@index([projectId, contactId, name, createdAt]) // For event-based segment queries (fast!)
  @@index([contactId, name, createdAt]) // For per-contact event lookups
  @@index([projectId, name, createdAt]) // For event stats and analytics by type over time
  @@index([contactId, createdAt]) // For contact activity timeline (recent events)
  @@index([data(ops: JsonbOps)], type: Gin) // GIN index for event data queries
  @@map("events")
}

// ============================================
// ENUMS
// ============================================

enum AuthMethod {
  PASSWORD
  GOOGLE_OAUTH
  GITHUB_OAUTH
}

enum Role {
  OWNER
  ADMIN
  MEMBER
}

enum TemplateType {
  TRANSACTIONAL
  MARKETING
}

enum TrackingMode {
  ENABLED // Track opens and clicks for all emails
  DISABLED // No tracking for any emails
  MARKETING_ONLY // Track only marketing/campaign emails, not transactional
}

enum CampaignStatus {
  DRAFT
  SCHEDULED
  SENDING
  SENT
  CANCELLED
}

enum CampaignAudienceType {
  ALL // All contacts
  FILTERED // Based on audienceFilter
  SEGMENT // Predefined segment
}

enum WorkflowTriggerType {
  EVENT // Triggered by an event (e.g., user.signup)
  MANUAL // Manually started via API
  SCHEDULE // Runs on a schedule (cron)
}

enum WorkflowStepType {
  TRIGGER // Entry point
  SEND_EMAIL // Send an email
  DELAY // Wait for X time
  WAIT_FOR_EVENT // Wait for specific event (with timeout)
  CONDITION // If/else branching
  EXIT // Early exit point
  WEBHOOK // Call external webhook
  UPDATE_CONTACT // Update contact fields
}

enum WorkflowExecutionStatus {
  RUNNING // Currently executing
  WAITING // Waiting for event or delay
  COMPLETED // Finished normally
  EXITED // Exited early (via EXIT step)
  FAILED // Failed with error
  CANCELLED // Manually cancelled
}

// ============================================
// API REQUEST LOGGING
// ============================================

model ApiRequest {
  id String @id // Request ID (UUID from X-Request-ID header)

  // Request metadata
  method     String // HTTP method (GET, POST, etc.)
  path       String // Request path (/v1/send, /contacts, etc.)
  statusCode Int // HTTP response status code
  duration   Int // Response time in milliseconds

  // Authentication context
  projectId String? // Project that made the request (if authenticated)
  project   Project? @relation(fields: [projectId], references: [id], onDelete: SetNull)
  userId    String? // User that made the request (if JWT auth)
  authType  String? // "apiKey" or "jwt"

  // Request details
  ip        String? // Client IP address
  userAgent String? // User-Agent header

  // Error information (if status >= 400)
  errorCode    String? // Machine-readable error code (VALIDATION_ERROR, etc.)
  errorMessage String? // Human-readable error message

  // Size tracking (for analytics)
  requestSize  Int? // Request body size in bytes
  responseSize Int? // Response body size in bytes

  // Timestamps
  createdAt DateTime @default(now())

  // Indexes for efficient querying
  @@index([projectId, createdAt(sort: Desc)]) // Query requests by project, most recent first
  @@index([userId, createdAt(sort: Desc)]) // Query requests by user
  @@index([statusCode, createdAt(sort: Desc)]) // Query errors (WHERE statusCode >= 400)
  @@index([path, createdAt(sort: Desc)]) // Query by endpoint
  @@index([createdAt(sort: Desc)]) // General time-based queries
  @@index([projectId, statusCode, createdAt(sort: Desc)]) // Composite for project error queries
  @@map("api_requests")
}

// ============================================
// ENUMS
// ============================================

enum StepExecutionStatus {
  PENDING // Not yet started
  SCHEDULED // Scheduled for future execution (DELAY)
  WAITING // Waiting for event (WAIT_FOR_EVENT)
  RUNNING // Currently executing
  COMPLETED // Successfully completed
  SKIPPED // Skipped (e.g., condition not met)
  FAILED // Failed with error
}

enum EmailSourceType {
  TRANSACTIONAL // Sent via API call
  CAMPAIGN // Sent as part of broadcast
  WORKFLOW // Sent via workflow automation
}

enum EmailStatus {
  PENDING // Queued for sending
  SENDING // Currently being sent
  SENT // Successfully sent to provider
  DELIVERED // Confirmed delivered
  OPENED // Recipient opened email
  CLICKED // Recipient clicked link
  BOUNCED // Bounced (hard or soft)
  COMPLAINED // Marked as spam
  FAILED // Failed to send
}