package store

import (
	"database/sql"
	"path/filepath"
	"slices"
	"testing"
)

func openTestDB(t *testing.T, path string) *sql.DB {
	t.Helper()
	db, err := sql.Open("sqlite", "file:"+path+"?_pragma=foreign_keys(1)&_txlock=immediate")
	if err != nil {
		t.Fatalf("open db: %v", err)
	}
	t.Cleanup(func() { db.Close() })
	return db
}

func appliedNames(t *testing.T, db *sql.DB) []string {
	t.Helper()
	rows, err := db.Query(`SELECT name FROM migrations ORDER BY rowid`)
	if err != nil {
		t.Fatalf("list migrations: %v", err)
	}
	defer rows.Close()

	names := []string{}
	for rows.Next() {
		name := ""
		err = rows.Scan(&name)
		if err != nil {
			t.Fatalf("scan migration: %v", err)
		}
		names = append(names, name)
	}
	if rows.Err() != nil {
		t.Fatalf("list migrations: %v", rows.Err())
	}
	return names
}

func migrationNames(ms []migration) []string {
	names := []string{}
	for _, m := range ms {
		names = append(names, m.name)
	}
	return names
}

func insertReport(t *testing.T, db *sql.DB, id, payload string) {
	t.Helper()
	_, err := db.Exec(`
		INSERT OR IGNORE INTO users (login, display_name, created_at) VALUES ('alice', 'Alice', 'x');
		INSERT OR IGNORE INTO projects (id, name, repo_path, default_branch, remote, created_by, created_at) VALUES ('p1', 'demo', '/nonexistent', 'main', 'none', 'alice', 'x');
		INSERT OR IGNORE INTO tasks (id, project_id, title, branch, worktree_path, base_ref, status, created_by, created_at) VALUES ('t1', 'p1', 't1', 't1', '/nonexistent', 'x', 'active', 'alice', 'x');
		INSERT OR IGNORE INTO agent_sessions (id, task_id, vendor, model, vendor_session_id, state, role, created_by, created_at) VALUES ('s1', 't1', 'claude', '', 's1', 'idle', 'implementer', 'alice', 'x');
	`)
	if err != nil {
		t.Fatalf("insert parents: %v", err)
	}
	_, err = db.Exec(`
		INSERT INTO inbox_items (id, project_id, task_id, agent_session_id, thread_id, kind, priority, blocking, payload, state, created_at)
		VALUES (?, 'p1', 't1', 's1', ?, 'report', 0, 0, ?, 'open', 'x')
	`, id, id, payload)
	if err != nil {
		t.Fatalf("insert report: %v", err)
	}
}

func reportPayload(t *testing.T, db *sql.DB, id string) string {
	t.Helper()
	payload := ""
	err := db.QueryRow(`SELECT payload FROM inbox_items WHERE id = ?`, id).Scan(&payload)
	if err != nil {
		t.Fatalf("read report: %v", err)
	}
	return payload
}

func TestMigrateFreshDatabase(t *testing.T) {
	db := openTestDB(t, filepath.Join(t.TempDir(), "byre.db"))

	err := migrate(db, migrations)
	if err != nil {
		t.Fatalf("migrate: %v", err)
	}
	err = migrate(db, migrations)
	if err != nil {
		t.Fatalf("migrate again: %v", err)
	}

	got := appliedNames(t, db)
	want := migrationNames(migrations)
	if !slices.Equal(got, want) {
		t.Fatalf("applied %v, want %v", got, want)
	}
}

func TestMigrateFromUserVersion(t *testing.T) {
	path := filepath.Join(t.TempDir(), "byre.db")
	db := openTestDB(t, path)
	for _, m := range migrations[:9] {
		_, err := db.Exec(m.sql)
		if err != nil {
			t.Fatalf("old migration %s: %v", m.name, err)
		}
	}
	_, err := db.Exec(`PRAGMA user_version = 9`)
	if err != nil {
		t.Fatalf("set user_version: %v", err)
	}
	insertReport(t, db, "r1", `{"text":"- shipped"}`)
	db.Close()

	db = openTestDB(t, path)
	err = migrate(db, migrations)
	if err != nil {
		t.Fatalf("migrate: %v", err)
	}

	got := appliedNames(t, db)
	want := migrationNames(migrations)
	if !slices.Equal(got, want) {
		t.Fatalf("applied %v, want %v", got, want)
	}
	payload := reportPayload(t, db, "r1")
	if payload != `{"text":"- shipped"}` {
		t.Fatalf("report payload %s, want it unchanged", payload)
	}
}

func TestMigrateRunsMigrationAddedBeforeApplied(t *testing.T) {
	db := openTestDB(t, filepath.Join(t.TempDir(), "byre.db"))
	first := migration{"create-a", `CREATE TABLE a (x TEXT)`}
	other := migration{"create-b", `CREATE TABLE b (x TEXT)`}
	last := migration{"create-c", `CREATE TABLE c (x TEXT)`}

	err := migrate(db, []migration{first, last})
	if err != nil {
		t.Fatalf("migrate: %v", err)
	}
	err = migrate(db, []migration{first, other, last})
	if err != nil {
		t.Fatalf("migrate with other branch: %v", err)
	}

	got := appliedNames(t, db)
	want := []string{"create-a", "create-c", "create-b"}
	if !slices.Equal(got, want) {
		t.Fatalf("applied %v, want %v", got, want)
	}
	_, err = db.Exec(`INSERT INTO b (x) VALUES ('y')`)
	if err != nil {
		t.Fatalf("table from other branch: %v", err)
	}
}

func TestBlobsMigrationOverPositionalCopy(t *testing.T) {
	db := openTestDB(t, filepath.Join(t.TempDir(), "byre.db"))
	err := migrate(db, migrations[:9])
	if err != nil {
		t.Fatalf("migrate: %v", err)
	}
	insertReport(t, db, "r1", `{"text":"x"}`)
	_, err = db.Exec(`
		CREATE TABLE blobs (id TEXT PRIMARY KEY, content_type TEXT NOT NULL, path TEXT NOT NULL, created_by TEXT NOT NULL REFERENCES users(login), created_at TEXT NOT NULL);
		INSERT INTO blobs VALUES ('b1', 'image/png', 'blobs/b1', 'alice', 'x');
		ALTER TABLE turn_queue ADD COLUMN images TEXT NOT NULL DEFAULT '[]';
		INSERT INTO turn_queue (session_id, actor, text, created_at) VALUES ('s1', 'alice', 'queued', 'x');
	`)
	if err != nil {
		t.Fatalf("positional copy: %v", err)
	}

	err = migrate(db, migrations)
	if err != nil {
		t.Fatalf("migrate: %v", err)
	}

	text := ""
	images := ""
	err = db.QueryRow(`SELECT text, images FROM turn_queue WHERE session_id = 's1'`).Scan(&text, &images)
	if err != nil {
		t.Fatalf("queued turn: %v", err)
	}
	if text != "queued" || images != "[]" {
		t.Fatalf("queued turn %q %q", text, images)
	}
	blobs := 0
	err = db.QueryRow(`SELECT count(*) FROM blobs`).Scan(&blobs)
	if err != nil || blobs != 1 {
		t.Fatalf("blobs %d: %v", blobs, err)
	}
}

func TestInlineQuestionChoicesMigration(t *testing.T) {
	db := openTestDB(t, filepath.Join(t.TempDir(), "byre.db"))
	i := slices.IndexFunc(migrations, func(m migration) bool { return m.name == "inline-question-choices" })
	err := migrate(db, migrations[:i])
	if err != nil {
		t.Fatalf("migrate: %v", err)
	}
	insertReport(t, db, "r1", `{"text":"x"}`)
	_, err = db.Exec(`
		INSERT INTO inbox_items (id, project_id, task_id, agent_session_id, thread_id, kind, priority, blocking, payload, state, created_at)
		VALUES ('q1', 'p1', 't1', 's1', 'q1', 'question', 0, 1,
			'{"context":"Pick a color.","question":"Which?","why_blocked":"w","options":["red","blue"],"recommended_option":"blue","attachments":[]}', 'answered', 'x');
		INSERT INTO inbox_responses (id, item_id, user_login, type, option, text, attachments, created_at) VALUES ('a1', 'q1', 'alice', 'option', 'red', NULL, '[]', 'x');
		INSERT INTO inbox_responses (id, item_id, user_login, type, option, text, attachments, created_at) VALUES ('a2', 'q1', 'alice', 'other', NULL, 'green', '[]', 'x');
	`)
	if err != nil {
		t.Fatalf("insert question: %v", err)
	}

	err = migrate(db, migrations)
	if err != nil {
		t.Fatalf("migrate: %v", err)
	}

	payload := reportPayload(t, db, "q1")
	want := `{"context":"Pick a color.\n\n- ( ) red\n- (*) blue","question":"Which?","why_blocked":"w","options":["red","blue"],"attachments":[],"multiple":false,"recommended":["blue"]}`
	if payload != want {
		t.Fatalf("question payload\n got %s\nwant %s", payload, want)
	}
	if reportPayload(t, db, "r1") != `{"text":"x"}` {
		t.Fatalf("report payload changed")
	}

	options := map[string]sql.NullString{}
	rows, err := db.Query(`SELECT id, options FROM inbox_responses`)
	if err != nil {
		t.Fatalf("responses: %v", err)
	}
	defer rows.Close()
	for rows.Next() {
		id := ""
		o := sql.NullString{}
		err = rows.Scan(&id, &o)
		if err != nil {
			t.Fatalf("scan: %v", err)
		}
		options[id] = o
	}
	if options["a1"].String != `["red"]` || options["a2"].Valid {
		t.Fatalf("response options %+v", options)
	}
}

func TestFlattenReportPayloadsRunsTwice(t *testing.T) {
	db := openTestDB(t, filepath.Join(t.TempDir(), "byre.db"))
	err := migrate(db, migrations)
	if err != nil {
		t.Fatalf("migrate: %v", err)
	}
	insertReport(t, db, "r1", `{"done":["one","two"]}`)

	i := slices.IndexFunc(migrations, func(m migration) bool { return m.name == "flatten-report-payloads-to-text" })
	for range 2 {
		_, err = db.Exec(migrations[i].sql)
		if err != nil {
			t.Fatalf("flatten: %v", err)
		}
		payload := reportPayload(t, db, "r1")
		if payload != `{"text":"- one\n- two"}` {
			t.Fatalf("report payload %s", payload)
		}
	}
}