package jobs

import (
	"strings"
	"testing"

	"git.unkin.net/unkin/repospawner/internal/store"
)

func view(t Type, succeeded, failed bool, result string) View {
	return View{Type: t, Request: "abc123", Succeeded: succeeded, Failed: failed, Result: []byte(result)}
}

func TestAdvance(t *testing.T) {
	base := store.Request{ID: "abc123", Name: "widget", State: store.StateOpeningPR}
	withCI := base
	withCI.Woodpecker = true
	prDone := `{"pr_number":42,"pr_url":"https://git.unkin.net/unkin/terraform-git/pulls/42"}`

	cases := []struct {
		name       string
		in         store.Request
		views      map[Type]View
		wantState  store.State
		wantAction Action
		wantPR     int
		wantErrSub string
	}{
		{
			name:       "pr job still running",
			in:         base,
			views:      map[Type]View{TypePR: view(TypePR, false, false, "")},
			wantState:  store.StateOpeningPR,
			wantAction: ActionNone,
		},
		{
			name:       "pr opened starts the watch",
			in:         base,
			views:      map[Type]View{TypePR: view(TypePR, true, false, prDone)},
			wantState:  store.StatePROpen,
			wantAction: ActionCreateWatch,
			wantPR:     42,
		},
		{
			name:       "pr job failed",
			in:         base,
			views:      map[Type]View{TypePR: view(TypePR, false, true, `{"error":"create branch: status 403"}`)},
			wantState:  store.StateFailed,
			wantAction: ActionNone,
			wantErrSub: "status 403",
		},
		{
			name:       "pr job succeeded but said nothing",
			in:         base,
			views:      map[Type]View{TypePR: view(TypePR, true, false, "")},
			wantState:  store.StateFailed,
			wantAction: ActionNone,
			wantErrSub: "without reporting",
		},
		{
			name: "watch running keeps the pr open",
			in:   base,
			views: map[Type]View{
				TypePR:    view(TypePR, true, false, prDone),
				TypeWatch: view(TypeWatch, false, false, ""),
			},
			wantState:  store.StatePROpen,
			wantAction: ActionNone,
			wantPR:     42,
		},
		{
			name: "merge without woodpecker is ready",
			in:   base,
			views: map[Type]View{
				TypePR:    view(TypePR, true, false, prDone),
				TypeWatch: view(TypeWatch, true, false, `{"merged":true}`),
			},
			wantState:  store.StateReady,
			wantAction: ActionNone,
			wantPR:     42,
		},
		{
			name: "merge with woodpecker enables ci",
			in:   withCI,
			views: map[Type]View{
				TypePR:    view(TypePR, true, false, prDone),
				TypeWatch: view(TypeWatch, true, false, `{"merged":true}`),
			},
			wantState:  store.StateEnablingCI,
			wantAction: ActionCreateWoodpecker,
			wantPR:     42,
		},
		{
			name: "closed pull request stops everything",
			in:   withCI,
			views: map[Type]View{
				TypePR:    view(TypePR, true, false, prDone),
				TypeWatch: view(TypeWatch, true, false, `{"closed":true}`),
			},
			wantState:  store.StateClosed,
			wantAction: ActionNone,
		},
		{
			name: "woodpecker enablement completes the request",
			in:   withCI,
			views: map[Type]View{
				TypeWatch:      view(TypeWatch, true, false, `{"merged":true}`),
				TypeWoodpecker: view(TypeWoodpecker, true, false, `{"enabled":true,"repo_id":9}`),
			},
			wantState:  store.StateReady,
			wantAction: ActionNone,
		},
		{
			name: "woodpecker enablement failure surfaces its error",
			in:   withCI,
			views: map[Type]View{
				TypeWatch:      view(TypeWatch, true, false, `{"merged":true}`),
				TypeWoodpecker: view(TypeWoodpecker, false, true, `{"error":"enable in woodpecker: status 401"}`),
			},
			wantState:  store.StateFailed,
			wantAction: ActionNone,
			wantErrSub: "status 401",
		},
		{
			name:       "watch job failure fails the request",
			in:         base,
			views:      map[Type]View{TypeWatch: view(TypeWatch, false, true, "")},
			wantState:  store.StateFailed,
			wantAction: ActionNone,
			wantErrSub: "watch job failed",
		},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			got, action := Advance(tc.in, tc.views)
			if got.State != tc.wantState {
				t.Errorf("state = %q, want %q", got.State, tc.wantState)
			}
			if action != tc.wantAction {
				t.Errorf("action = %q, want %q", action, tc.wantAction)
			}
			if tc.wantPR != 0 && got.PRNumber != tc.wantPR {
				t.Errorf("prNumber = %d, want %d", got.PRNumber, tc.wantPR)
			}
			if tc.wantErrSub != "" && !strings.Contains(got.Error, tc.wantErrSub) {
				t.Errorf("error = %q, want it to mention %q", got.Error, tc.wantErrSub)
			}
			if tc.wantState == store.StateReady && tc.in.Woodpecker && !got.CIEnabled {
				t.Errorf("ciEnabled = false for a completed woodpecker request")
			}
		})
	}
}

// TestAdvanceIsStableAfterTTL covers the window where finished Jobs have been
// garbage collected: a terminal request must not be re-driven.
func TestAdvanceIsStableAfterTTL(t *testing.T) {
	done := store.Request{ID: "abc123", Name: "widget", Woodpecker: true, State: store.StateReady, CIEnabled: true, PRNumber: 42}
	got, action := Advance(done, map[Type]View{})
	if got.State != store.StateReady || action != ActionNone {
		t.Errorf("state = %q action = %q, want ready/none", got.State, action)
	}
}