import { test, expect } from "bun:test"
import os from "os"
import { PermissionNext } from "../../src/permission/next"
import { Instance } from "../../src/project/instance"
import { tmpdir } from "../fixture/fixture"

// fromConfig tests

test("fromConfig - string value becomes wildcard rule", () => {
  const result = PermissionNext.fromConfig({ bash: "allow" })
  expect(result).toEqual([{ permission: "bash", pattern: "*", action: "allow" }])
})

test("fromConfig - object value converts to rules array", () => {
  const result = PermissionNext.fromConfig({ bash: { "*": "allow", rm: "deny" } })
  expect(result).toEqual([
    { permission: "bash", pattern: "*", action: "allow" },
    { permission: "bash", pattern: "rm", action: "deny" },
  ])
})

test("fromConfig - mixed string and object values", () => {
  const result = PermissionNext.fromConfig({
    bash: { "*": "allow", rm: "deny" },
    edit: "allow",
    webfetch: "ask",
  })
  expect(result).toEqual([
    { permission: "bash", pattern: "*", action: "allow" },
    { permission: "bash", pattern: "rm", action: "deny" },
    { permission: "edit", pattern: "*", action: "allow" },
    { permission: "webfetch", pattern: "*", action: "ask" },
  ])
})

test("fromConfig - empty object", () => {
  const result = PermissionNext.fromConfig({})
  expect(result).toEqual([])
})

test("fromConfig - expands tilde to home directory", () => {
  const result = PermissionNext.fromConfig({ external_directory: { "~/projects/*": "allow" } })
  expect(result).toEqual([{ permission: "external_directory", pattern: `${os.homedir()}/projects/*`, action: "allow" }])
})

test("fromConfig - expands $HOME to home directory", () => {
  const result = PermissionNext.fromConfig({ external_directory: { "$HOME/projects/*": "allow" } })
  expect(result).toEqual([{ permission: "external_directory", pattern: `${os.homedir()}/projects/*`, action: "allow" }])
})

test("fromConfig - expands $HOME without trailing slash", () => {
  const result = PermissionNext.fromConfig({ external_directory: { $HOME: "allow" } })
  expect(result).toEqual([{ permission: "external_directory", pattern: os.homedir(), action: "allow" }])
})

test("fromConfig - does not expand tilde in middle of path", () => {
  const result = PermissionNext.fromConfig({ external_directory: { "/some/~/path": "allow" } })
  expect(result).toEqual([{ permission: "external_directory", pattern: "/some/~/path", action: "allow" }])
})

test("fromConfig - expands exact tilde to home directory", () => {
  const result = PermissionNext.fromConfig({ external_directory: { "~": "allow" } })
  expect(result).toEqual([{ permission: "external_directory", pattern: os.homedir(), action: "allow" }])
})

test("evaluate - matches expanded tilde pattern", () => {
  const ruleset = PermissionNext.fromConfig({ external_directory: { "~/projects/*": "allow" } })
  const result = PermissionNext.evaluate("external_directory", `${os.homedir()}/projects/file.txt`, ruleset)
  expect(result.action).toBe("allow")
})

test("evaluate - matches expanded $HOME pattern", () => {
  const ruleset = PermissionNext.fromConfig({ external_directory: { "$HOME/projects/*": "allow" } })
  const result = PermissionNext.evaluate("external_directory", `${os.homedir()}/projects/file.txt`, ruleset)
  expect(result.action).toBe("allow")
})

// merge tests

test("merge - simple concatenation", () => {
  const result = PermissionNext.merge(
    [{ permission: "bash", pattern: "*", action: "allow" }],
    [{ permission: "bash", pattern: "*", action: "deny" }],
  )
  expect(result).toEqual([
    { permission: "bash", pattern: "*", action: "allow" },
    { permission: "bash", pattern: "*", action: "deny" },
  ])
})

test("merge - adds new permission", () => {
  const result = PermissionNext.merge(
    [{ permission: "bash", pattern: "*", action: "allow" }],
    [{ permission: "edit", pattern: "*", action: "deny" }],
  )
  expect(result).toEqual([
    { permission: "bash", pattern: "*", action: "allow" },
    { permission: "edit", pattern: "*", action: "deny" },
  ])
})

test("merge - concatenates rules for same permission", () => {
  const result = PermissionNext.merge(
    [{ permission: "bash", pattern: "foo", action: "ask" }],
    [{ permission: "bash", pattern: "*", action: "deny" }],
  )
  expect(result).toEqual([
    { permission: "bash", pattern: "foo", action: "ask" },
    { permission: "bash", pattern: "*", action: "deny" },
  ])
})

test("merge - multiple rulesets", () => {
  const result = PermissionNext.merge(
    [{ permission: "bash", pattern: "*", action: "allow" }],
    [{ permission: "bash", pattern: "rm", action: "ask" }],
    [{ permission: "edit", pattern: "*", action: "allow" }],
  )
  expect(result).toEqual([
    { permission: "bash", pattern: "*", action: "allow" },
    { permission: "bash", pattern: "rm", action: "ask" },
    { permission: "edit", pattern: "*", action: "allow" },
  ])
})

test("merge - empty ruleset does nothing", () => {
  const result = PermissionNext.merge([{ permission: "bash", pattern: "*", action: "allow" }], [])
  expect(result).toEqual([{ permission: "bash", pattern: "*", action: "allow" }])
})

test("merge - preserves rule order", () => {
  const result = PermissionNext.merge(
    [
      { permission: "edit", pattern: "src/*", action: "allow" },
      { permission: "edit", pattern: "src/secret/*", action: "deny" },
    ],
    [{ permission: "edit", pattern: "src/secret/ok.ts", action: "allow" }],
  )
  expect(result).toEqual([
    { permission: "edit", pattern: "src/*", action: "allow" },
    { permission: "edit", pattern: "src/secret/*", action: "deny" },
    { permission: "edit", pattern: "src/secret/ok.ts", action: "allow" },
  ])
})

test("merge - config permission overrides default ask", () => {
  // Simulates: defaults have "*": "ask", config sets bash: "allow"
  const defaults: PermissionNext.Ruleset = [{ permission: "*", pattern: "*", action: "ask" }]
  const config: PermissionNext.Ruleset = [{ permission: "bash", pattern: "*", action: "allow" }]
  const merged = PermissionNext.merge(defaults, config)

  // Config's bash allow should override default ask
  expect(PermissionNext.evaluate("bash", "ls", merged).action).toBe("allow")
  // Other permissions should still be ask (from defaults)
  expect(PermissionNext.evaluate("edit", "foo.ts", merged).action).toBe("ask")
})

test("merge - config ask overrides default allow", () => {
  // Simulates: defaults have bash: "allow", config sets bash: "ask"
  const defaults: PermissionNext.Ruleset = [{ permission: "bash", pattern: "*", action: "allow" }]
  const config: PermissionNext.Ruleset = [{ permission: "bash", pattern: "*", action: "ask" }]
  const merged = PermissionNext.merge(defaults, config)

  // Config's ask should override default allow
  expect(PermissionNext.evaluate("bash", "ls", merged).action).toBe("ask")
})

// evaluate tests

test("evaluate - exact pattern match", () => {
  const result = PermissionNext.evaluate("bash", "rm", [{ permission: "bash", pattern: "rm", action: "deny" }])
  expect(result.action).toBe("deny")
})

test("evaluate - wildcard pattern match", () => {
  const result = PermissionNext.evaluate("bash", "rm", [{ permission: "bash", pattern: "*", action: "allow" }])
  expect(result.action).toBe("allow")
})

test("evaluate - last matching rule wins", () => {
  const result = PermissionNext.evaluate("bash", "rm", [
    { permission: "bash", pattern: "*", action: "allow" },
    { permission: "bash", pattern: "rm", action: "deny" },
  ])
  expect(result.action).toBe("deny")
})

test("evaluate - last matching rule wins (wildcard after specific)", () => {
  const result = PermissionNext.evaluate("bash", "rm", [
    { permission: "bash", pattern: "rm", action: "deny" },
    { permission: "bash", pattern: "*", action: "allow" },
  ])
  expect(result.action).toBe("allow")
})

test("evaluate - glob pattern match", () => {
  const result = PermissionNext.evaluate("edit", "src/foo.ts", [
    { permission: "edit", pattern: "src/*", action: "allow" },
  ])
  expect(result.action).toBe("allow")
})

test("evaluate - last matching glob wins", () => {
  const result = PermissionNext.evaluate("edit", "src/components/Button.tsx", [
    { permission: "edit", pattern: "src/*", action: "deny" },
    { permission: "edit", pattern: "src/components/*", action: "allow" },
  ])
  expect(result.action).toBe("allow")
})

test("evaluate - order matters for specificity", () => {
  // If more specific rule comes first, later wildcard overrides it
  const result = PermissionNext.evaluate("edit", "src/components/Button.tsx", [
    { permission: "edit", pattern: "src/components/*", action: "allow" },
    { permission: "edit", pattern: "src/*", action: "deny" },
  ])
  expect(result.action).toBe("deny")
})

test("evaluate - unknown permission returns ask", () => {
  const result = PermissionNext.evaluate("unknown_tool", "anything", [
    { permission: "bash", pattern: "*", action: "allow" },
  ])
  expect(result.action).toBe("ask")
})

test("evaluate - empty ruleset returns ask", () => {
  const result = PermissionNext.evaluate("bash", "rm", [])
  expect(result.action).toBe("ask")
})

test("evaluate - no matching pattern returns ask", () => {
  const result = PermissionNext.evaluate("edit", "etc/passwd", [
    { permission: "edit", pattern: "src/*", action: "allow" },
  ])
  expect(result.action).toBe("ask")
})

test("evaluate - empty rules array returns ask", () => {
  const result = PermissionNext.evaluate("bash", "rm", [])
  expect(result.action).toBe("ask")
})

test("evaluate - multiple matching patterns, last wins", () => {
  const result = PermissionNext.evaluate("edit", "src/secret.ts", [
    { permission: "edit", pattern: "*", action: "ask" },
    { permission: "edit", pattern: "src/*", action: "allow" },
    { permission: "edit", pattern: "src/secret.ts", action: "deny" },
  ])
  expect(result.action).toBe("deny")
})

test("evaluate - non-matching patterns are skipped", () => {
  const result = PermissionNext.evaluate("edit", "src/foo.ts", [
    { permission: "edit", pattern: "*", action: "ask" },
    { permission: "edit", pattern: "test/*", action: "deny" },
    { permission: "edit", pattern: "src/*", action: "allow" },
  ])
  expect(result.action).toBe("allow")
})

test("evaluate - exact match at end wins over earlier wildcard", () => {
  const result = PermissionNext.evaluate("bash", "/bin/rm", [
    { permission: "bash", pattern: "*", action: "allow" },
    { permission: "bash", pattern: "/bin/rm", action: "deny" },
  ])
  expect(result.action).toBe("deny")
})

test("evaluate - wildcard at end overrides earlier exact match", () => {
  const result = PermissionNext.evaluate("bash", "/bin/rm", [
    { permission: "bash", pattern: "/bin/rm", action: "deny" },
    { permission: "bash", pattern: "*", action: "allow" },
  ])
  expect(result.action).toBe("allow")
})

// wildcard permission tests

test("evaluate - wildcard permission matches any permission", () => {
  const result = PermissionNext.evaluate("bash", "rm", [{ permission: "*", pattern: "*", action: "deny" }])
  expect(result.action).toBe("deny")
})

test("evaluate - wildcard permission with specific pattern", () => {
  const result = PermissionNext.evaluate("bash", "rm", [{ permission: "*", pattern: "rm", action: "deny" }])
  expect(result.action).toBe("deny")
})

test("evaluate - glob permission pattern", () => {
  const result = PermissionNext.evaluate("mcp_server_tool", "anything", [
    { permission: "mcp_*", pattern: "*", action: "allow" },
  ])
  expect(result.action).toBe("allow")
})

test("evaluate - specific permission and wildcard permission combined", () => {
  const result = PermissionNext.evaluate("bash", "rm", [
    { permission: "*", pattern: "*", action: "deny" },
    { permission: "bash", pattern: "*", action: "allow" },
  ])
  expect(result.action).toBe("allow")
})

test("evaluate - wildcard permission does not match when specific exists", () => {
  const result = PermissionNext.evaluate("edit", "src/foo.ts", [
    { permission: "*", pattern: "*", action: "deny" },
    { permission: "edit", pattern: "src/*", action: "allow" },
  ])
  expect(result.action).toBe("allow")
})

test("evaluate - multiple matching permission patterns combine rules", () => {
  const result = PermissionNext.evaluate("mcp_dangerous", "anything", [
    { permission: "*", pattern: "*", action: "ask" },
    { permission: "mcp_*", pattern: "*", action: "allow" },
    { permission: "mcp_dangerous", pattern: "*", action: "deny" },
  ])
  expect(result.action).toBe("deny")
})

test("evaluate - wildcard permission fallback for unknown tool", () => {
  const result = PermissionNext.evaluate("unknown_tool", "anything", [
    { permission: "*", pattern: "*", action: "ask" },
    { permission: "bash", pattern: "*", action: "allow" },
  ])
  expect(result.action).toBe("ask")
})

test("evaluate - permission patterns sorted by length regardless of object order", () => {
  // specific permission listed before wildcard, but specific should still win
  const result = PermissionNext.evaluate("bash", "rm", [
    { permission: "bash", pattern: "*", action: "allow" },
    { permission: "*", pattern: "*", action: "deny" },
  ])
  // With flat list, last matching rule wins - so "*" matches bash and wins
  expect(result.action).toBe("deny")
})

test("evaluate - merges multiple rulesets", () => {
  const config: PermissionNext.Ruleset = [{ permission: "bash", pattern: "*", action: "allow" }]
  const approved: PermissionNext.Ruleset = [{ permission: "bash", pattern: "rm", action: "deny" }]
  // approved comes after config, so rm should be denied
  const result = PermissionNext.evaluate("bash", "rm", config, approved)
  expect(result.action).toBe("deny")
})

// disabled tests

test("disabled - returns empty set when all tools allowed", () => {
  const result = PermissionNext.disabled(["bash", "edit", "read"], [{ permission: "*", pattern: "*", action: "allow" }])
  expect(result.size).toBe(0)
})

test("disabled - disables tool when denied", () => {
  const result = PermissionNext.disabled(
    ["bash", "edit", "read"],
    [
      { permission: "*", pattern: "*", action: "allow" },
      { permission: "bash", pattern: "*", action: "deny" },
    ],
  )
  expect(result.has("bash")).toBe(true)
  expect(result.has("edit")).toBe(false)
  expect(result.has("read")).toBe(false)
})

test("disabled - disables edit/write/patch/multiedit when edit denied", () => {
  const result = PermissionNext.disabled(
    ["edit", "write", "patch", "multiedit", "bash"],
    [
      { permission: "*", pattern: "*", action: "allow" },
      { permission: "edit", pattern: "*", action: "deny" },
    ],
  )
  expect(result.has("edit")).toBe(true)
  expect(result.has("write")).toBe(true)
  expect(result.has("patch")).toBe(true)
  expect(result.has("multiedit")).toBe(true)
  expect(result.has("bash")).toBe(false)
})

test("disabled - does not disable when partially denied", () => {
  const result = PermissionNext.disabled(
    ["bash"],
    [
      { permission: "bash", pattern: "*", action: "allow" },
      { permission: "bash", pattern: "rm *", action: "deny" },
    ],
  )
  expect(result.has("bash")).toBe(false)
})

test("disabled - does not disable when action is ask", () => {
  const result = PermissionNext.disabled(["bash", "edit"], [{ permission: "*", pattern: "*", action: "ask" }])
  expect(result.size).toBe(0)
})

test("disabled - does not disable when specific allow after wildcard deny", () => {
  // Tool is NOT disabled because a specific allow after wildcard deny means
  // there's at least some usage allowed
  const result = PermissionNext.disabled(
    ["bash"],
    [
      { permission: "bash", pattern: "*", action: "deny" },
      { permission: "bash", pattern: "echo *", action: "allow" },
    ],
  )
  expect(result.has("bash")).toBe(false)
})

test("disabled - does not disable when wildcard allow after deny", () => {
  const result = PermissionNext.disabled(
    ["bash"],
    [
      { permission: "bash", pattern: "rm *", action: "deny" },
      { permission: "bash", pattern: "*", action: "allow" },
    ],
  )
  expect(result.has("bash")).toBe(false)
})

test("disabled - disables multiple tools", () => {
  const result = PermissionNext.disabled(
    ["bash", "edit", "webfetch"],
    [
      { permission: "bash", pattern: "*", action: "deny" },
      { permission: "edit", pattern: "*", action: "deny" },
      { permission: "webfetch", pattern: "*", action: "deny" },
    ],
  )
  expect(result.has("bash")).toBe(true)
  expect(result.has("edit")).toBe(true)
  expect(result.has("webfetch")).toBe(true)
})

test("disabled - wildcard permission denies all tools", () => {
  const result = PermissionNext.disabled(["bash", "edit", "read"], [{ permission: "*", pattern: "*", action: "deny" }])
  expect(result.has("bash")).toBe(true)
  expect(result.has("edit")).toBe(true)
  expect(result.has("read")).toBe(true)
})

test("disabled - specific allow overrides wildcard deny", () => {
  const result = PermissionNext.disabled(
    ["bash", "edit", "read"],
    [
      { permission: "*", pattern: "*", action: "deny" },
      { permission: "bash", pattern: "*", action: "allow" },
    ],
  )
  expect(result.has("bash")).toBe(false)
  expect(result.has("edit")).toBe(true)
  expect(result.has("read")).toBe(true)
})

// ask tests

test("ask - resolves immediately when action is allow", async () => {
  await using tmp = await tmpdir({ git: true })
  await Instance.provide({
    directory: tmp.path,
    fn: async () => {
      const result = await PermissionNext.ask({
        sessionID: "session_test",
        permission: "bash",
        patterns: ["ls"],
        metadata: {},
        always: [],
        ruleset: [{ permission: "bash", pattern: "*", action: "allow" }],
      })
      expect(result).toBeUndefined()
    },
  })
})

test("ask - throws RejectedError when action is deny", async () => {
  await using tmp = await tmpdir({ git: true })
  await Instance.provide({
    directory: tmp.path,
    fn: async () => {
      await expect(
        PermissionNext.ask({
          sessionID: "session_test",
          permission: "bash",
          patterns: ["rm -rf /"],
          metadata: {},
          always: [],
          ruleset: [{ permission: "bash", pattern: "*", action: "deny" }],
        }),
      ).rejects.toBeInstanceOf(PermissionNext.DeniedError)
    },
  })
})

test("ask - returns pending promise when action is ask", async () => {
  await using tmp = await tmpdir({ git: true })
  await Instance.provide({
    directory: tmp.path,
    fn: async () => {
      const promise = PermissionNext.ask({
        sessionID: "session_test",
        permission: "bash",
        patterns: ["ls"],
        metadata: {},
        always: [],
        ruleset: [{ permission: "bash", pattern: "*", action: "ask" }],
      })
      // Promise should be pending, not resolved
      expect(promise).toBeInstanceOf(Promise)
      // Don't await - just verify it returns a promise
    },
  })
})

// reply tests

test("reply - once resolves the pending ask", async () => {
  await using tmp = await tmpdir({ git: true })
  await Instance.provide({
    directory: tmp.path,
    fn: async () => {
      const askPromise = PermissionNext.ask({
        id: "permission_test1",
        sessionID: "session_test",
        permission: "bash",
        patterns: ["ls"],
        metadata: {},
        always: [],
        ruleset: [],
      })

      await PermissionNext.reply({
        requestID: "permission_test1",
        reply: "once",
      })

      await expect(askPromise).resolves.toBeUndefined()
    },
  })
})

test("reply - reject throws RejectedError", async () => {
  await using tmp = await tmpdir({ git: true })
  await Instance.provide({
    directory: tmp.path,
    fn: async () => {
      const askPromise = PermissionNext.ask({
        id: "permission_test2",
        sessionID: "session_test",
        permission: "bash",
        patterns: ["ls"],
        metadata: {},
        always: [],
        ruleset: [],
      })

      await PermissionNext.reply({
        requestID: "permission_test2",
        reply: "reject",
      })

      await expect(askPromise).rejects.toBeInstanceOf(PermissionNext.RejectedError)
    },
  })
})

test("reply - always persists approval and resolves", async () => {
  await using tmp = await tmpdir({ git: true })
  await Instance.provide({
    directory: tmp.path,
    fn: async () => {
      const askPromise = PermissionNext.ask({
        id: "permission_test3",
        sessionID: "session_test",
        permission: "bash",
        patterns: ["ls"],
        metadata: {},
        always: ["ls"],
        ruleset: [],
      })

      await PermissionNext.reply({
        requestID: "permission_test3",
        reply: "always",
      })

      await expect(askPromise).resolves.toBeUndefined()
    },
  })
  // Re-provide to reload state with stored permissions
  await Instance.provide({
    directory: tmp.path,
    fn: async () => {
      // Stored approval should allow without asking
      const result = await PermissionNext.ask({
        sessionID: "session_test2",
        permission: "bash",
        patterns: ["ls"],
        metadata: {},
        always: [],
        ruleset: [],
      })
      expect(result).toBeUndefined()
    },
  })
})

test("reply - reject cancels all pending for same session", async () => {
  await using tmp = await tmpdir({ git: true })
  await Instance.provide({
    directory: tmp.path,
    fn: async () => {
      const askPromise1 = PermissionNext.ask({
        id: "permission_test4a",
        sessionID: "session_same",
        permission: "bash",
        patterns: ["ls"],
        metadata: {},
        always: [],
        ruleset: [],
      })

      const askPromise2 = PermissionNext.ask({
        id: "permission_test4b",
        sessionID: "session_same",
        permission: "edit",
        patterns: ["foo.ts"],
        metadata: {},
        always: [],
        ruleset: [],
      })

      // Catch rejections before they become unhandled
      const result1 = askPromise1.catch((e) => e)
      const result2 = askPromise2.catch((e) => e)

      // Reject the first one
      await PermissionNext.reply({
        requestID: "permission_test4a",
        reply: "reject",
      })

      // Both should be rejected
      expect(await result1).toBeInstanceOf(PermissionNext.RejectedError)
      expect(await result2).toBeInstanceOf(PermissionNext.RejectedError)
    },
  })
})

test("ask - checks all patterns and stops on first deny", async () => {
  await using tmp = await tmpdir({ git: true })
  await Instance.provide({
    directory: tmp.path,
    fn: async () => {
      await expect(
        PermissionNext.ask({
          sessionID: "session_test",
          permission: "bash",
          patterns: ["echo hello", "rm -rf /"],
          metadata: {},
          always: [],
          ruleset: [
            { permission: "bash", pattern: "*", action: "allow" },
            { permission: "bash", pattern: "rm *", action: "deny" },
          ],
        }),
      ).rejects.toBeInstanceOf(PermissionNext.DeniedError)
    },
  })
})

test("ask - allows all patterns when all match allow rules", async () => {
  await using tmp = await tmpdir({ git: true })
  await Instance.provide({
    directory: tmp.path,
    fn: async () => {
      const result = await PermissionNext.ask({
        sessionID: "session_test",
        permission: "bash",
        patterns: ["echo hello", "ls -la", "pwd"],
        metadata: {},
        always: [],
        ruleset: [{ permission: "bash", pattern: "*", action: "allow" }],
      })
      expect(result).toBeUndefined()
    },
  })
})
