import { describe, test, expect, beforeEach, afterEach } from "bun:test"
import { Database } from "bun:sqlite"
import { drizzle } from "drizzle-orm/bun-sqlite"
import { migrate } from "drizzle-orm/bun-sqlite/migrator"
import { eq } from "drizzle-orm"
import path from "path"
import fs from "fs/promises"
import { readFileSync } from "fs"
import os from "os"
import { migrateFromJson } from "../../src/storage/json-migration"
import { ProjectTable } from "../../src/project/project.sql"
import { Project } from "../../src/project/project"
import {
  SessionTable,
  MessageTable,
  PartTable,
  SessionDiffTable,
  TodoTable,
  PermissionTable,
} from "../../src/session/session.sql"
import { SessionShareTable, ShareTable } from "../../src/share/share.sql"

// Test fixtures
const fixtures = {
  project: {
    id: "proj_test123abc",
    name: "Test Project",
    worktree: "/test/path",
    vcs: "git" as const,
    sandboxes: [],
  },
  session: {
    id: "ses_test456def",
    projectID: "proj_test123abc",
    slug: "test-session",
    directory: "/test/path",
    title: "Test Session",
    version: "1.0.0",
    time: { created: 1700000000000, updated: 1700000001000 },
  },
  message: {
    id: "msg_test789ghi",
    sessionID: "ses_test456def",
    role: "user" as const,
    agent: "default",
    model: { providerID: "openai", modelID: "gpt-4" },
    time: { created: 1700000000000 },
  },
  part: {
    id: "prt_testabc123",
    messageID: "msg_test789ghi",
    sessionID: "ses_test456def",
    type: "text" as const,
    text: "Hello, world!",
  },
}

// Helper to create test storage directory structure
async function setupStorageDir(baseDir: string) {
  const storageDir = path.join(baseDir, "storage")
  await fs.mkdir(path.join(storageDir, "project"), { recursive: true })
  await fs.mkdir(path.join(storageDir, "session", "proj_test123abc"), { recursive: true })
  await fs.mkdir(path.join(storageDir, "message", "ses_test456def"), { recursive: true })
  await fs.mkdir(path.join(storageDir, "part", "msg_test789ghi"), { recursive: true })
  await fs.mkdir(path.join(storageDir, "session_diff"), { recursive: true })
  await fs.mkdir(path.join(storageDir, "todo"), { recursive: true })
  await fs.mkdir(path.join(storageDir, "permission"), { recursive: true })
  await fs.mkdir(path.join(storageDir, "session_share"), { recursive: true })
  await fs.mkdir(path.join(storageDir, "share"), { recursive: true })
  // Create legacy marker to indicate JSON storage exists
  await Bun.write(path.join(storageDir, "migration"), "1")
  return storageDir
}

// Helper to create in-memory test database with schema
function createTestDb() {
  const sqlite = new Database(":memory:")
  sqlite.exec("PRAGMA foreign_keys = ON")

  // Apply schema migrations using drizzle migrate
  const dir = path.join(import.meta.dirname, "../../migration")
  const journal = JSON.parse(readFileSync(path.join(dir, "meta/_journal.json"), "utf-8")) as {
    entries: { tag: string; when: number }[]
  }
  const migrations = journal.entries.map((entry) => ({
    sql: readFileSync(path.join(dir, `${entry.tag}.sql`), "utf-8"),
    timestamp: entry.when,
  }))
  migrate(drizzle({ client: sqlite }), migrations)

  return sqlite
}

describe("JSON to SQLite migration", () => {
  let tmpDir: string
  let storageDir: string
  let sqlite: Database

  beforeEach(async () => {
    tmpDir = path.join(os.tmpdir(), "opencode-migration-test-" + Math.random().toString(36).slice(2))
    await fs.mkdir(tmpDir, { recursive: true })
    storageDir = await setupStorageDir(tmpDir)
    sqlite = createTestDb()
  })

  afterEach(async () => {
    sqlite.close()
    await fs.rm(tmpDir, { recursive: true, force: true })
  })

  test("migrates project", async () => {
    await Bun.write(
      path.join(storageDir, "project", "proj_test123abc.json"),
      JSON.stringify({
        id: "proj_test123abc",
        worktree: "/test/path",
        vcs: "git",
        name: "Test Project",
        time: { created: 1700000000000, updated: 1700000001000 },
        sandboxes: ["/test/sandbox"],
      }),
    )

    const stats = await migrateFromJson(sqlite, storageDir)

    expect(stats?.projects).toBe(1)

    const db = drizzle({ client: sqlite })
    const projects = db.select().from(ProjectTable).all()
    expect(projects.length).toBe(1)
    expect(projects[0].id).toBe("proj_test123abc")
    expect(projects[0].worktree).toBe("/test/path")
    expect(projects[0].name).toBe("Test Project")
    expect(projects[0].sandboxes).toEqual(["/test/sandbox"])
  })

  test("migrates session with individual columns", async () => {
    // First create the project
    await Bun.write(
      path.join(storageDir, "project", "proj_test123abc.json"),
      JSON.stringify({
        id: "proj_test123abc",
        worktree: "/test/path",
        time: { created: Date.now(), updated: Date.now() },
        sandboxes: [],
      }),
    )

    await Bun.write(
      path.join(storageDir, "session", "proj_test123abc", "ses_test456def.json"),
      JSON.stringify({
        id: "ses_test456def",
        projectID: "proj_test123abc",
        slug: "test-session",
        directory: "/test/dir",
        title: "Test Session Title",
        version: "1.0.0",
        time: { created: 1700000000000, updated: 1700000001000 },
        summary: { additions: 10, deletions: 5, files: 3 },
        share: { url: "https://example.com/share" },
      }),
    )

    await migrateFromJson(sqlite, storageDir)

    const db = drizzle({ client: sqlite })
    const sessions = db.select().from(SessionTable).all()
    expect(sessions.length).toBe(1)
    expect(sessions[0].id).toBe("ses_test456def")
    expect(sessions[0].project_id).toBe("proj_test123abc")
    expect(sessions[0].slug).toBe("test-session")
    expect(sessions[0].title).toBe("Test Session Title")
    expect(sessions[0].summary_additions).toBe(10)
    expect(sessions[0].summary_deletions).toBe(5)
    expect(sessions[0].share_url).toBe("https://example.com/share")
  })

  test("migrates messages and parts", async () => {
    await Bun.write(
      path.join(storageDir, "project", "proj_test123abc.json"),
      JSON.stringify({
        id: "proj_test123abc",
        worktree: "/",
        time: { created: Date.now(), updated: Date.now() },
        sandboxes: [],
      }),
    )
    await Bun.write(
      path.join(storageDir, "session", "proj_test123abc", "ses_test456def.json"),
      JSON.stringify({ ...fixtures.session }),
    )
    await Bun.write(
      path.join(storageDir, "message", "ses_test456def", "msg_test789ghi.json"),
      JSON.stringify({ ...fixtures.message }),
    )
    await Bun.write(
      path.join(storageDir, "part", "msg_test789ghi", "prt_testabc123.json"),
      JSON.stringify({ ...fixtures.part }),
    )

    const stats = await migrateFromJson(sqlite, storageDir)

    expect(stats?.messages).toBe(1)
    expect(stats?.parts).toBe(1)

    const db = drizzle({ client: sqlite })
    const messages = db.select().from(MessageTable).all()
    expect(messages.length).toBe(1)
    expect(messages[0].data.id).toBe("msg_test789ghi")

    const parts = db.select().from(PartTable).all()
    expect(parts.length).toBe(1)
    expect(parts[0].data.id).toBe("prt_testabc123")
  })

  test("skips orphaned sessions (no parent project)", async () => {
    await Bun.write(
      path.join(storageDir, "session", "proj_test123abc", "ses_orphan.json"),
      JSON.stringify({
        id: "ses_orphan",
        projectID: "proj_nonexistent",
        slug: "orphan",
        directory: "/",
        title: "Orphan",
        version: "1.0.0",
        time: { created: Date.now(), updated: Date.now() },
      }),
    )

    const stats = await migrateFromJson(sqlite, storageDir)

    expect(stats?.sessions).toBe(0)
  })

  test("is idempotent (running twice doesn't duplicate)", async () => {
    await Bun.write(
      path.join(storageDir, "project", "proj_test123abc.json"),
      JSON.stringify({
        id: "proj_test123abc",
        worktree: "/",
        time: { created: Date.now(), updated: Date.now() },
        sandboxes: [],
      }),
    )

    await migrateFromJson(sqlite, storageDir)
    await migrateFromJson(sqlite, storageDir)

    const db = drizzle({ client: sqlite })
    const projects = db.select().from(ProjectTable).all()
    expect(projects.length).toBe(1) // Still only 1 due to onConflictDoNothing
  })
})