// This is your Prisma schema file,
// learn more about it in the docs: https://pris.ly/d/prisma-schema

generator client {
  provider = "prisma-client-js"
}

datasource db {
  provider = "sqlite"
  url      = env("DATABASE_URL")
}

model User {
  id        Int      @id @default(autoincrement())
  email     String   @unique
  password  String
  fullName  String   @map("full_name")
  userType  UserType @map("user_type")
  isActive  Boolean  @default(true) @map("is_active")
  createdAt DateTime @default(now()) @map("created_at")
  updatedAt DateTime @updatedAt @map("updated_at")

  // Blockchain wallet information
  walletAddress   String? @unique @map("wallet_address")
  walletPublicKey String? @map("wallet_public_key")

  // Relationships
  projects     CarbonProject[] @relation("ProjectDeveloper")
  transactions Transaction[]   @relation("TransactionBuyer")

  @@map("users")
}

model CarbonProject {
  id          Int      @id @default(autoincrement())
  title       String
  description String
  location    String
  projectType String   @map("project_type")
  methodology String
  createdAt   DateTime @default(now()) @map("created_at")
  updatedAt   DateTime @updatedAt @map("updated_at")

  // Carbon offset details
  totalCreditsAvailable Int   @map("total_credits_available")
  creditsSold           Int   @default(0) @map("credits_sold")
  pricePerCredit        Float @map("price_per_credit")

  // Project timeline
  startDate DateTime @map("start_date")
  endDate   DateTime @map("end_date")

  // Verification and status
  verificationStatus      VerificationStatus @default(PENDING) @map("verification_status")
  verificationDocumentUrl String?            @map("verification_document_url")
  isActive                Boolean            @default(true) @map("is_active")

  // Blockchain information
  contractAddress String? @map("contract_address")
  tokenId         String? @map("token_id")

  // Foreign keys
  developerId Int @map("developer_id")

  // Relationships
  developer User           @relation("ProjectDeveloper", fields: [developerId], references: [id])
  offsets   CarbonOffset[]

  @@map("carbon_projects")
}

model CarbonOffset {
  id           Int      @id @default(autoincrement())
  serialNumber String   @unique @map("serial_number")
  vintageYear  Int      @map("vintage_year")
  quantity     Int
  status       OffsetStatus @default(AVAILABLE)
  createdAt    DateTime @default(now()) @map("created_at")
  updatedAt    DateTime @updatedAt @map("updated_at")

  // Blockchain information
  tokenId        String? @unique @map("token_id")
  blockchainHash String? @map("blockchain_hash")

  // Foreign keys
  projectId Int @map("project_id")

  // Relationships
  project      CarbonProject @relation(fields: [projectId], references: [id])
  transactions Transaction[]

  @@map("carbon_offsets")
}

model Transaction {
  id              Int      @id @default(autoincrement())
  transactionHash String   @unique @map("transaction_hash")
  quantity        Int
  pricePerCredit  Float    @map("price_per_credit")
  totalAmount     Float    @map("total_amount")
  createdAt       DateTime @default(now()) @map("created_at")

  // Transaction status
  status      TransactionStatus @default(PENDING)
  confirmedAt DateTime?         @map("confirmed_at")

  // Blockchain information
  blockNumber Int? @map("block_number")
  gasUsed     Int? @map("gas_used")

  // Foreign keys
  buyerId  Int @map("buyer_id")
  offsetId Int @map("offset_id")

  // Relationships
  buyer  User         @relation("TransactionBuyer", fields: [buyerId], references: [id])
  offset CarbonOffset @relation(fields: [offsetId], references: [id])

  @@map("transactions")
}

enum UserType {
  DEVELOPER
  BUYER
}

enum VerificationStatus {
  PENDING
  VERIFIED
  REJECTED
}

enum OffsetStatus {
  AVAILABLE
  SOLD
  RETIRED
}

enum TransactionStatus {
  PENDING
  CONFIRMED
  FAILED
}