import { afterEach, beforeEach, describe, expect, it, mock } from "bun:test"
import { mkdirSync, realpathSync, rmSync } from "node:fs"
import { tmpdir } from "node:os"
import { join } from "node:path"

const TEST_DIR = join(tmpdir(), `project-discovery-dirs-${Date.now()}`)
let worktreeSpawnCount = 0

function canonicalPath(path: string): string {
  return realpathSync(path)
}

describe("project-discovery-dirs", () => {
  beforeEach(() => {
    mkdirSync(TEST_DIR, { recursive: true })
  })

  afterEach(() => {
    rmSync(TEST_DIR, { recursive: true, force: true })
  })

  it("#given repeated worktree detection #when detecting twice #then reuses the cached result", async () => {
    // given
    worktreeSpawnCount = 0

    mock.module("node:child_process", () => ({
      execFileSync: () => {
        worktreeSpawnCount += 1
        return TEST_DIR
      },
    }))

    const { clearWorktreeCache, detectWorktreePath } = await import("./project-discovery-dirs")

    clearWorktreeCache()

    // when
    const firstPath = detectWorktreePath("/some/dir")
    const secondPath = detectWorktreePath("/some/dir")
    clearWorktreeCache()
    const thirdPath = detectWorktreePath("/some/dir")

    // then
    expect(firstPath).toBe(TEST_DIR)
    expect(secondPath).toBe(TEST_DIR)
    expect(thirdPath).toBe(TEST_DIR)
    expect(worktreeSpawnCount).toBe(2)
  })

  it("#given nested .opencode skill directories #when finding project opencode skill dirs #then returns nearest-first with aliases", async () => {
    // given
    const projectDir = join(TEST_DIR, "project")
    const childDir = join(projectDir, "apps", "cli")
    mkdirSync(join(projectDir, ".opencode", "skill"), { recursive: true })
    mkdirSync(join(projectDir, ".opencode", "skills"), { recursive: true })
    mkdirSync(join(TEST_DIR, ".opencode", "skills"), { recursive: true })

    const { findProjectOpencodeSkillDirs } = await import("./project-discovery-dirs")

    // when
    const directories = findProjectOpencodeSkillDirs(childDir)

    // then
    expect(directories).toEqual([
      canonicalPath(join(projectDir, ".opencode", "skills")),
      canonicalPath(join(projectDir, ".opencode", "skill")),
      canonicalPath(join(TEST_DIR, ".opencode", "skills")),
    ])
  })

  it("#given nested .opencode command directories #when finding project opencode command dirs #then returns nearest-first with aliases", async () => {
    // given
    const projectDir = join(TEST_DIR, "project")
    const childDir = join(projectDir, "packages", "tool")
    mkdirSync(join(projectDir, ".opencode", "commands"), { recursive: true })
    mkdirSync(join(TEST_DIR, ".opencode", "command"), { recursive: true })

    const { findProjectOpencodeCommandDirs } = await import("./project-discovery-dirs")

    // when
    const directories = findProjectOpencodeCommandDirs(childDir)

    // then
    expect(directories).toEqual([
      canonicalPath(join(projectDir, ".opencode", "commands")),
      canonicalPath(join(TEST_DIR, ".opencode", "command")),
    ])
  })

  it("#given ancestor claude and agents skill directories #when finding project compatibility dirs #then discovers both scopes", async () => {
    // given
    const projectDir = join(TEST_DIR, "project")
    const childDir = join(projectDir, "src", "nested")
    mkdirSync(join(projectDir, ".claude", "skills"), { recursive: true })
    mkdirSync(join(TEST_DIR, ".agents", "skills"), { recursive: true })

    const { findProjectAgentsSkillDirs, findProjectClaudeSkillDirs } = await import("./project-discovery-dirs")

    // when
    const claudeDirectories = findProjectClaudeSkillDirs(childDir)
    const agentsDirectories = findProjectAgentsSkillDirs(childDir)

    // then
    expect(claudeDirectories).toEqual([canonicalPath(join(projectDir, ".claude", "skills"))])
    expect(agentsDirectories).toEqual([canonicalPath(join(TEST_DIR, ".agents", "skills"))])
  })

  it("#given a stop directory #when finding ancestor dirs #then it does not scan beyond the stop boundary", async () => {
    // given
    const projectDir = join(TEST_DIR, "project")
    const childDir = join(projectDir, "apps", "cli")
    mkdirSync(join(projectDir, ".opencode", "skills"), { recursive: true })
    mkdirSync(join(TEST_DIR, ".opencode", "skills"), { recursive: true })

    const { findProjectOpencodeSkillDirs } = await import("./project-discovery-dirs")

    // when
    const directories = findProjectOpencodeSkillDirs(childDir, projectDir)

    // then
    expect(directories).toEqual([canonicalPath(join(projectDir, ".opencode", "skills"))])
  })

})