/**
 * Drizzle ORM Schema for the Plant Disease Knowledge Base.
 *
 * Uses Turso (libSQL) with SQLite dialect.
 * Arrays (symptoms, causes, treatment, prevention, lookalike_ids)
 * are stored as JSON text columns and typed via Drizzle's $type().
 */

import { sql } from "drizzle-orm";
import { sqliteTable, text, integer, index } from "drizzle-orm/sqlite-core";

// ─── Plants Table ────────────────────────────────────────────────────────────

export const plants = sqliteTable(
  "plants",
  {
    id: text("id").primaryKey(),
    commonName: text("common_name").notNull(),
    scientificName: text("scientific_name").notNull(),
    family: text("family").notNull(),
    category: text("category").notNull(),
    careSummary: text("care_summary").notNull().default(""),
    imageUrl: text("image_url").notNull().default(""),
    createdAt: text("created_at")
      .notNull()
      .default(sql`(datetime('now'))`),
    updatedAt: text("updated_at")
      .notNull()
      .default(sql`(datetime('now'))`),
  },
  (table) => ({
    categoryIdx: index("idx_plants_category").on(table.category),
    commonNameIdx: index("idx_plants_common_name").on(table.commonName),
  }),
);

// ─── Diseases Table ──────────────────────────────────────────────────────────

export const diseases = sqliteTable(
  "diseases",
  {
    id: text("id").primaryKey(),
    plantId: text("plant_id")
      .notNull()
      .references(() => plants.id),
    name: text("name").notNull(),
    scientificName: text("scientific_name").notNull().default(""),
    causalAgentType: text("causal_agent_type", {
      enum: ["fungal", "bacterial", "viral", "environmental"],
    }).notNull(),
    description: text("description").notNull().default(""),
    symptoms: text("symptoms", { mode: "json" }).notNull().default([]).$type<string[]>(),
    causes: text("causes", { mode: "json" }).notNull().default([]).$type<string[]>(),
    treatment: text("treatment", { mode: "json" }).notNull().default([]).$type<string[]>(),
    prevention: text("prevention", { mode: "json" }).notNull().default([]).$type<string[]>(),
    lookalikeIds: text("lookalike_ids", { mode: "json" }).notNull().default([]).$type<string[]>(),
    prevalence: text("prevalence", {
      enum: ["common", "uncommon", "rare", "very_rare"],
    })
      .notNull()
      .default("uncommon"),
    prevalenceScore: integer("prevalence_score").notNull().default(0),
    severity: text("severity", {
      enum: ["low", "moderate", "high", "critical"],
    }).notNull(),
    imageUrl: text("image_url").notNull().default(""),
    sourceUrl: text("source_url").notNull().default(""),
    createdAt: text("created_at")
      .notNull()
      .default(sql`(datetime('now'))`),
    updatedAt: text("updated_at")
      .notNull()
      .default(sql`(datetime('now'))`),
  },
  (table) => ({
    plantIdIdx: index("idx_diseases_plant_id").on(table.plantId),
    causalAgentIdx: index("idx_diseases_causal_agent").on(table.causalAgentType),
    severityIdx: index("idx_diseases_severity").on(table.severity),
    prevalenceIdx: index("idx_diseases_prevalence").on(table.prevalence),
  }),
);

// ─── Scrape Sources Table ────────────────────────────────────────────────────

export const scrapeSources = sqliteTable("scrape_sources", {
  id: text("id").primaryKey(),
  sourceType: text("source_type", {
    enum: ["wikipedia", "university_extension", "cabi", "other"],
  }).notNull(),
  sourceUrl: text("source_url").notNull(),
  lastScrapedAt: text("last_scraped_at"),
  entriesCount: integer("entries_count").default(0),
  status: text("status", { enum: ["pending", "success", "error"] })
    .notNull()
    .default("pending"),
  errorMessage: text("error_message"),
  createdAt: text("created_at")
    .notNull()
    .default(sql`(datetime('now'))`),
});

// ─── Plant Views Table ───────────────────────────────────────────────────────

export const plantViews = sqliteTable(
  "plant_views",
  {
    plantId: text("plant_id")
      .primaryKey()
      .references(() => plants.id),
    viewCount: integer("view_count").notNull().default(0),
  },
  (table) => ({
    viewCountIdx: index("idx_plant_views_count").on(table.viewCount),
  }),
);

// ─── Flagged Content Table ─────────────────────────────────────────────────

/**
 * Stores user-flagged content for manual review.
 * content_type: what kind of content is flagged
 * content_id: the ID of the plant or disease
 * field_name: specific field being flagged (e.g., "image", "symptoms", "causes", "treatment", "prevention")
 * flag_count: number of times this item has been flagged
 */
export const flaggedContent = sqliteTable(
  "flagged_content",
  {
    id: text("id").primaryKey(),
    contentType: text("content_type", {
      enum: [
        "plant_image",
        "disease_image",
        "disease_description",
        "disease_symptoms",
        "disease_causes",
        "disease_treatment",
        "disease_prevention",
      ],
    }).notNull(),
    contentId: text("content_id").notNull(),
    fieldName: text("field_name").notNull(),
    notes: text("notes").default(""),
    flagCount: integer("flag_count").notNull().default(1),
    createdAt: text("created_at")
      .notNull()
      .default(sql`(datetime('now'))`),
    updatedAt: text("updated_at")
      .notNull()
      .default(sql`(datetime('now'))`),
  },
  (table) => ({
    contentTypeIdx: index("idx_flagged_content_type").on(table.contentType),
    contentIdIdx: index("idx_flagged_content_id").on(table.contentId),
  }),
);

// ─── Type helpers ────────────────────────────────────────────────────────────

export type FlaggedContentRow = typeof flaggedContent.$inferSelect;
export type FlaggedContentInsert = typeof flaggedContent.$inferInsert;

// ─── Relation Inference ──────────────────────────────────────────────────────

export const plantsRelations = {};
export const diseasesRelations = {};

// ─── Type helpers ────────────────────────────────────────────────────────────

export type PlantRow = typeof plants.$inferSelect;
export type PlantInsert = typeof plants.$inferInsert;
export type DiseaseRow = typeof diseases.$inferSelect;
export type DiseaseInsert = typeof diseases.$inferInsert;