generator client {
  provider = "prisma-client"
  output   = "../src/generated/prisma"
}

datasource db {
  provider = "postgresql"
}

enum UserRole {
  engineer
  admin
}

enum IngredientCategory {
  emulsifier
  humectant
  thickener
  preservative
  antioxidant
  fragrance
  colorant
  ph_adjuster
  sunscreen
  surfactant
  emollient
  other
}

model User {
  id           String   @id @default(uuid())
  username     String   @unique
  passwordHash String   @map("password_hash")
  role         UserRole @default(engineer)
  createdAt    DateTime @default(now()) @map("created_at")

  formulas        Formula[]       @relation("FormulaCreator")
  colorFormulas   ColorFormula[]  @relation("ColorFormulaCreator")
  formulaVersions FormulaVersion[]
  projects        Project[]

  @@map("users")
}

model Project {
  id          String   @id @default(uuid())
  name        String
  description String?
  createdBy   String   @map("created_by")
  createdAt   DateTime @default(now()) @map("created_at")

  creator  User      @relation(fields: [createdBy], references: [id])
  formulas Formula[]

  @@map("projects")
}

model Formula {
  id             String   @id @default(uuid())
  name           String
  description    String?
  projectId      String?  @map("project_id")
  currentVersion Int      @default(1) @map("current_version")
  createdBy      String   @map("created_by")
  createdAt      DateTime @default(now()) @map("created_at")
  updatedAt      DateTime @updatedAt @map("updated_at")
  embedding      Unsupported("vector(1536)")?

  project          Project?          @relation(fields: [projectId], references: [id])
  creator          User              @relation("FormulaCreator", fields: [createdBy], references: [id])
  versions         FormulaVersion[]
  colorFormulas    ColorFormula[]

  @@index([projectId])
  @@index([createdBy])
  @@map("formulas")
}

model FormulaVersion {
  id            String   @id @default(uuid())
  formulaId     String   @map("formula_id")
  versionNumber Int      @map("version_number")
  description   String?
  snapshotData  Json     @map("snapshot_data")
  createdBy     String   @map("created_by")
  createdAt     DateTime @default(now()) @map("created_at")

  formula  Formula             @relation(fields: [formulaId], references: [id])
  creator  User                @relation(fields: [createdBy], references: [id])
  phases   Phase[]
  ingredients FormulaIngredient[]

  @@unique([formulaId, versionNumber])
  @@index([formulaId])
  @@map("formula_versions")
}

model Ingredient {
  id              String            @id @default(uuid())
  inciName        String            @map("inci_name")
  chineseName     String            @map("chinese_name")
  functionCategory IngredientCategory @map("function_category")
  supplier        String?
  unit            String            @default("kg")
  unitPrice       Decimal?          @map("unit_price") @db.Decimal(10, 2)
  description     String?
  createdAt       DateTime          @default(now()) @map("created_at")

  formulaIngredients FormulaIngredient[]

  @@index([functionCategory])
  @@map("ingredients")
}

model Phase {
  id        String @id @default(uuid())
  name      String
  formulaId String @map("formula_id")
  sortOrder Int    @default(0) @map("sort_order")

  formulaVersion FormulaVersion       @relation(fields: [formulaId], references: [id])
  ingredients    FormulaIngredient[]

  @@index([formulaId])
  @@map("phases")
}

model FormulaIngredient {
  id               String   @id @default(uuid())
  formulaVersionId String   @map("formula_version_id")
  phaseId          String?  @map("phase_id")
  ingredientId     String   @map("ingredient_id")
  percentage       Decimal  @db.Decimal(5, 2)
  processNotes     String?  @map("process_notes")

  formulaVersion FormulaVersion @relation(fields: [formulaVersionId], references: [id])
  phase          Phase?         @relation(fields: [phaseId], references: [id])
  ingredient     Ingredient     @relation(fields: [ingredientId], references: [id])

  @@index([formulaVersionId])
  @@index([ingredientId])
  @@map("formula_ingredients")
}

model ColorFormula {
  id                  String   @id @default(uuid())
  name                String
  targetLab           Json     @map("target_lab")
  actualLab           Json?    @map("actual_lab")
  deltaE              Float?   @map("delta_e")
  colorantComposition Json?    @map("colorant_composition")
  formulaId           String?  @map("formula_id")
  createdBy           String   @map("created_by")
  createdAt           DateTime @default(now()) @map("created_at")

  formula Formula? @relation(fields: [formulaId], references: [id])
  creator User     @relation("ColorFormulaCreator", fields: [createdBy], references: [id])

  @@index([formulaId])
  @@index([createdBy])
  @@map("color_formulas")
}

model AiAuditLog {
  id          String   @id @default(uuid())
  capability  String
  modelName   String   @map("model_name")
  promptHash  String   @map("prompt_hash")
  tokensUsed  Int?     @map("tokens_used")
  durationMs  Int?     @map("duration_ms")
  createdAt   DateTime @default(now()) @map("created_at")

  @@index([capability])
  @@index([createdAt])
  @@map("ai_audit_logs")
}