package commandcenter

import (
	"fmt"

	"github.com/shopspring/decimal"
)

// ExecutiveCard is one executive intelligence card on the Workforce Command Center. Every card is
// backed by a real query over the org's own data; when the feeding data does not exist yet the
// card says so honestly (NoData true, DataNote naming exactly what feeds it), never a fake number.
type ExecutiveCard struct {
	Key      string `json:"key"`
	Title    string `json:"title"`
	Value    string `json:"value"`
	Detail   string `json:"detail"`
	State    string `json:"state"` // ok, watch, risk, empty
	NoData   bool   `json:"no_data"`
	DataNote string `json:"data_note,omitempty"`
}

// buildExecutiveCards derives the four executive cards from the assembled view plus the screening
// confidence counts. Pure: unit testable without a database.
func buildExecutiveCards(v View, greenCoveredReqs, activeReqs int64) []ExecutiveCard {
	cards := make([]ExecutiveCard, 0, 4)

	// Mission Readiness: the weighted coverage score already assembled.
	mr := ExecutiveCard{Key: "mission_readiness", Title: "Mission Readiness"}
	if v.Meta.Empty {
		mr.NoData = true
		mr.State = "empty"
		mr.DataNote = "Feeds from your cleared workforce and active requirements. Add candidates and requirements to light this up."
	} else {
		mr.Value = v.MissionReadiness.Score
		mr.Detail = v.MissionReadiness.Status
		mr.State = bandToState(v.MissionReadiness.Band)
	}
	cards = append(cards, mr)

	// Revenue at Risk: the exact W2 counted basis summed over the staffing gaps.
	rar := ExecutiveCard{Key: "revenue_at_risk", Title: "Revenue at Risk"}
	total := decimal.Zero
	priced, unpriced, representative := 0, 0, false
	for _, g := range v.StaffingGaps {
		if g.ValueAtRisk != nil {
			if d, err := decimal.NewFromString(*g.ValueAtRisk); err == nil {
				total = total.Add(d)
			}
		}
		priced += g.PricedOpportunities
		unpriced += g.UnpricedOpportunities
		representative = representative || g.ValueRepresentative
	}
	switch {
	case v.Meta.Empty:
		rar.NoData = true
		rar.State = "empty"
		rar.DataNote = "Feeds from dollar values on open opportunities joined to unfilled staffing gaps. Add opportunities and requirements to light this up."
	case len(v.StaffingGaps) == 0:
		rar.Value = "$0"
		rar.Detail = "No unfilled staffing gaps expose revenue right now."
		rar.State = "ok"
	case priced == 0:
		rar.NoData = true
		rar.State = "empty"
		rar.DataNote = "Feeds from dollar values on open opportunities joined to unfilled gaps. No impacted opportunity carries a value yet."
	default:
		rar.Value = "$" + total.StringFixed(0)
		basis := fmt.Sprintf("Across %d priced opportunities; %d unpriced excluded.", priced, unpriced)
		if representative {
			basis += " Includes representative values."
		}
		rar.Detail = basis
		rar.State = "risk"
		if total.IsZero() {
			rar.State = "ok"
		}
	}
	cards = append(cards, rar)

	// Growth Capacity: proposal ready bench beyond the currently unmet demand.
	gc := ExecutiveCard{Key: "growth_capacity", Title: "Growth Capacity"}
	unmet := 0
	for _, g := range v.StaffingGaps {
		unmet += g.Unmet
	}
	if v.Banner.TotalClearedWorkforce == 0 {
		gc.NoData = true
		gc.State = "empty"
		gc.DataNote = "Feeds from proposal ready candidates measured against unmet requirement demand. Screen your bench to light this up."
	} else {
		surplus := v.Banner.ProposalReadyCandidates - unmet
		if surplus < 0 {
			surplus = 0
		}
		gc.Value = fmt.Sprintf("%d", surplus)
		gc.Detail = fmt.Sprintf("Proposal ready candidates beyond current unmet demand (%d ready, %d unmet slots).",
			v.Banner.ProposalReadyCandidates, unmet)
		switch {
		case surplus > 0:
			gc.State = "ok"
		case v.Banner.ProposalReadyCandidates > 0:
			gc.State = "watch"
		default:
			gc.State = "risk"
		}
	}
	cards = append(cards, gc)

	// Staffing Confidence: how much of the open demand has at least one proposal ready screen.
	sc := ExecutiveCard{Key: "staffing_confidence", Title: "Staffing Confidence"}
	if activeReqs == 0 {
		sc.NoData = true
		sc.State = "empty"
		sc.DataNote = "Feeds from stored screening evaluations against active requirements. Add requirements and screen candidates to light this up."
	} else {
		pct := decimal.NewFromInt(greenCoveredReqs).
			Div(decimal.NewFromInt(activeReqs)).
			Mul(decimal.NewFromInt(100)).Round(0)
		sc.Value = pct.String() + "%"
		sc.Detail = fmt.Sprintf("%d of %d active requirements have at least one proposal ready screen.",
			greenCoveredReqs, activeReqs)
		switch {
		case pct.GreaterThanOrEqual(decimal.NewFromInt(75)):
			sc.State = "ok"
		case pct.GreaterThanOrEqual(decimal.NewFromInt(40)):
			sc.State = "watch"
		default:
			sc.State = "risk"
		}
	}
	cards = append(cards, sc)

	return cards
}

func bandToState(band string) string {
	switch band {
	case "green":
		return "ok"
	case "yellow":
		return "watch"
	default:
		return "risk"
	}
}