; Phase 2 — branch: one branch = one agent. Fixture story: root-1 coordinates
; a refactor; lexer-1 + parser-1 spawn from its plan commit (lexer-1a nested
; under lexer-1); their sessions merge back (ff-shaped and true 3-way), then
; risky-1 collides with root-1 on plan.md and the conflict is resolved via
; merge-resolve!. Edges: sub-agent-of / reviews / merges.

(define agb-db (persist/mem-backend))
(define agb-sp (agentic/space agb-db "agentic-branch-test"))
(define agb-repo (agentic/space-repo agb-sp))

(define
  agb-root-briefing
  (agentic/briefing "coordinate refactor" "split parser module" {}))
(define agb-root (agentic/spawn! agb-sp "root-1" agb-root-briefing))

(agentic-test "spawn returns the agent" (get agb-root :agent) "root-1")
(agentic-test
  "spawn creates the agent branch"
  (contains? (git/branches agb-repo) "agents/root-1")
  true)
(agentic-test
  "head is the genesis"
  (= (agentic/head agb-sp "root-1") (get agb-root :genesis))
  true)
(agentic-test
  "genesis is a spawn commit"
  (agentic/commit-kind (git/read agb-repo (get agb-root :genesis)))
  "spawn")
(agentic-test
  "genesis records the briefing"
  (agentic/commit-briefing (git/read agb-repo (get agb-root :genesis)))
  (get agb-root :briefing))
(agentic-test
  "briefing-of reads back the briefing"
  (agentic/briefing-title (agentic/briefing-of agb-sp "root-1"))
  "coordinate refactor")
(agentic-test
  "root genesis has no parents"
  (= (git/parents agb-repo (get agb-root :genesis)) (list))
  true)
(agentic-test
  "spawn is create-only"
  (has-key? (agentic/spawn! agb-sp "root-1" agb-root-briefing) :conflict)
  true)
(agentic-test
  "agents lists the branch set"
  (= (agentic/agents agb-sp) (list "root-1"))
  true)

; ---- the commit verb ----
(define
  agb-c1
  (agentic/commit!
    agb-sp
    "root-1"
    "decision"
    (assoc {} "plan.md" "split into lexer+parser\n")
    {:message "plan recorded"}))

(agentic-test "commit! returns a cid" (starts-with? agb-c1 "sx1:") true)
(agentic-test
  "commit! advances the head"
  (= (agentic/head agb-sp "root-1") agb-c1)
  true)
(agentic-test
  "commit! records the kind"
  (agentic/commit-kind (git/read agb-repo agb-c1))
  "decision")
(agentic-test
  "briefing propagates to every commit"
  (agentic/commit-briefing (git/read agb-repo agb-c1))
  (get agb-root :briefing))
(agentic-test
  "commit! snapshots the worktree"
  (get (git/commit-files agb-repo agb-c1) "plan.md")
  "split into lexer+parser\n")
(agentic-test
  "unknown kind is rejected"
  (get
    (agentic/commit! agb-sp "root-1" "frobnicate" {} {})
    :error)
  "unknown-kind")
(agentic-test
  "commit to unknown agent fails"
  (get
    (agentic/commit! agb-sp "ghost" "finding" {} {})
    :error)
  "no-such-agent")
(agentic-test
  "session-log newest first"
  (=
    (agentic/session-log agb-sp "root-1")
    (list agb-c1 (get agb-root :genesis)))
  true)
(agentic-test
  "genesis found from head"
  (= (agentic/genesis agb-sp "root-1") (get agb-root :genesis))
  true)

; ---- sub-agents fork at the parent head ----
(define
  agb-lex-briefing
  (agentic/briefing "extract lexer" "pull tokenizer into lexer.sx" {}))
(define
  agb-lex
  (agentic/spawn-from! agb-sp "lexer-1" agb-lex-briefing "root-1"))
(define
  agb-par-briefing
  (agentic/briefing "extract parser" "pull grammar into parser.sx" {}))
(define
  agb-par
  (agentic/spawn-from! agb-sp "parser-1" agb-par-briefing "root-1"))

(agentic-test
  "spawn-from creates the sub branch"
  (get agb-lex :agent)
  "lexer-1")
(agentic-test
  "sub genesis forks at the parent head"
  (= (git/parents agb-repo (get agb-lex :genesis)) (list agb-c1))
  true)
(agentic-test
  "sub genesis inherits the base tree"
  (get (git/commit-files agb-repo (get agb-lex :genesis)) "plan.md")
  "split into lexer+parser\n")
(agentic-test
  "sub-agent edges recorded"
  (= (agentic/sub-agents agb-sp "root-1") (list "lexer-1" "parser-1"))
  true)
(agentic-test
  "parent-agent edge"
  (agentic/parent-agent agb-sp "lexer-1")
  "root-1")
(agentic-test
  "root has no parent agent"
  (agentic/parent-agent agb-sp "root-1")
  nil)
(agentic-test
  "spawn-from unknown parent fails"
  (get (agentic/spawn-from! agb-sp "x-1" agb-lex-briefing "ghost") :error)
  "no-such-agent")
(agentic-test
  "agents lists all branches sorted"
  (= (agentic/agents agb-sp) (list "lexer-1" "parser-1" "root-1"))
  true)

(define
  agb-lex2
  (agentic/spawn-from!
    agb-sp
    "lexer-1a"
    (agentic/briefing "lexer unicode" "handle utf8 in the lexer" {})
    "lexer-1"))

(agentic-test
  "agent-tree is transitive"
  (=
    (agentic/agent-tree agb-sp "root-1")
    (list "lexer-1" "lexer-1a" "parser-1"))
  true)

; ---- parallel session work ----
(define
  agb-lc1
  (agentic/commit!
    agb-sp
    "lexer-1"
    "refactor"
    (merge
      (git/commit-files agb-repo (get agb-lex :genesis))
      (assoc {} "lexer.sx" "(define lexer 1)\n"))
    {:message "lexer extracted"}))
(define
  agb-pc1
  (agentic/commit!
    agb-sp
    "parser-1"
    "refactor"
    (merge
      (git/commit-files agb-repo (get agb-par :genesis))
      (assoc {} "parser.sx" "(define parser 1)\n"))
    {:message "parser extracted"}))

(agentic-test
  "fork-point of sibling agents"
  (= (agentic/fork-point agb-sp "lexer-1" "parser-1") agb-c1)
  true)
(agentic-test
  "fork-point with itself is its head"
  (= (agentic/fork-point agb-sp "lexer-1" "lexer-1") agb-lc1)
  true)
(agentic-test
  "fork-point with unknown agent"
  (agentic/fork-point agb-sp "lexer-1" "ghost")
  nil)

; ---- session merge: ff-shaped history still gets a merge commit ----
(define agb-m1 (agentic/merge-session! agb-sp "root-1" "lexer-1" {:message "absorb lexer session"}))

(agentic-test "session merge merges" (get agb-m1 :result) "merged")
(agentic-test
  "merge commit has both session parents"
  (= (git/parents agb-repo (get agb-m1 :cid)) (list agb-c1 agb-lc1))
  true)
(agentic-test
  "merge advances the into head"
  (= (agentic/head agb-sp "root-1") (get agb-m1 :cid))
  true)
(agentic-test
  "merge commit is a session-merge"
  (agentic/commit-kind (git/read agb-repo (get agb-m1 :cid)))
  "session-merge")
(agentic-test
  "merge names the merged agent"
  (get (git/read agb-repo (get agb-m1 :cid)) :merged-agent)
  "lexer-1")
(agentic-test
  "merged tree carries the merged session"
  (get (git/commit-files agb-repo (get agb-m1 :cid)) "lexer.sx")
  "(define lexer 1)\n")
(agentic-test
  "merge keeps the into briefing"
  (agentic/commit-briefing (git/read agb-repo (get agb-m1 :cid)))
  (get agb-root :briefing))
(agentic-test
  "merges edge recorded"
  (= (agentic/merged-sessions agb-sp "root-1") (list "lexer-1"))
  true)
(agentic-test
  "merged-into inverse"
  (= (agentic/merged-into agb-sp "lexer-1") (list "root-1"))
  true)
(agentic-test
  "re-merge is up-to-date"
  (get (agentic/merge-session! agb-sp "root-1" "lexer-1" {}) :result)
  "up-to-date")

; ---- true three-way merge ----
(define agb-m2 (agentic/merge-session! agb-sp "root-1" "parser-1" {:message "absorb parser session"}))

(agentic-test "three-way session merge" (get agb-m2 :result) "merged")
(agentic-test
  "three-way tree unions the sessions"
  (get (git/commit-files agb-repo (get agb-m2 :cid)) "parser.sx")
  "(define parser 1)\n")
(agentic-test
  "three-way tree keeps ours side"
  (get (git/commit-files agb-repo (get agb-m2 :cid)) "lexer.sx")
  "(define lexer 1)\n")

; ---- conflicting sessions ----
(define
  agb-risk
  (agentic/spawn-from!
    agb-sp
    "risky-1"
    (agentic/briefing "rewrite plan" "contentious plan edit" {})
    "root-1"))
(define agb-risk-files (git/commit-files agb-repo (get agb-risk :genesis)))
(define
  agb-rc1
  (agentic/commit!
    agb-sp
    "risky-1"
    "decision"
    (merge agb-risk-files (assoc {} "plan.md" "risky rewrite\n"))
    {:message "risky plan"}))
(define
  agb-rootc2
  (agentic/commit!
    agb-sp
    "root-1"
    "decision"
    (merge agb-risk-files (assoc {} "plan.md" "steady as she goes\n"))
    {:message "root plan"}))
(define agb-mc (agentic/merge-session! agb-sp "root-1" "risky-1" {:message "risky merge"}))

(agentic-test
  "conflicting sessions surface conflicts"
  (get agb-mc :result)
  "conflicts")
(agentic-test
  "conflict paths name the file"
  (= (get agb-mc :conflicts) (list "plan.md"))
  true)
(agentic-test
  "conflicted merge commits nothing"
  (= (agentic/head agb-sp "root-1") agb-rootc2)
  true)

(define
  agb-res
  (agentic/merge-resolve!
    agb-sp
    "root-1"
    "risky-1"
    (merge
      agb-risk-files
      (assoc {} "plan.md" "steady, with one risky idea\n"))
    {:message "negotiated"}))

(agentic-test
  "merge-resolve! concludes the merge"
  (get agb-res :result)
  "merged")
(agentic-test
  "resolution advances the head"
  (= (agentic/head agb-sp "root-1") (get agb-res :cid))
  true)
(agentic-test
  "resolution has both parents"
  (= (git/parents agb-repo (get agb-res :cid)) (list agb-rootc2 agb-rc1))
  true)
(agentic-test
  "resolved content wins"
  (get (git/commit-files agb-repo (get agb-res :cid)) "plan.md")
  "steady, with one risky idea\n")

; ---- reviews + edge isolation ----
(agentic/reviews! agb-sp "parser-1" "lexer-1")

(agentic-test
  "reviewers edge"
  (= (agentic/reviewers agb-sp "lexer-1") (list "parser-1"))
  true)
(agentic-test
  "reviewing inverse"
  (= (agentic/reviewing agb-sp "parser-1") (list "lexer-1"))
  true)
(agentic-test
  "edge kinds are isolated"
  (= (agentic/sub-agents agb-sp "parser-1") (list))
  true)