package store

import (
	"context"
	"errors"

	"github.com/jackc/pgx/v5"

	"github.com/szabadpalya/api/internal/store/dbgen"
)

// The wire shapes below are what the frontend already expected from the
// previous stack, so the view layer never learned about the schema and does
// not have to now.

type Creator struct {
	Name     string `json:"name"`
	Initials string `json:"initials"`
	Location string `json:"location"`
	Blurb    string `json:"blurb"`
	// Empty when the owner has no photo. The client falls back to Initials,
	// so this is omitted from the payload rather than sent as "".
	AvatarURL string `json:"avatarUrl,omitempty"`
}

type StorySection struct {
	Heading string   `json:"heading"`
	Body    []string `json:"body"`
}

type Tier struct {
	ID                string   `json:"id"`
	Type              string   `json:"type"`
	Price             int      `json:"price"`
	ListPrice         *int     `json:"listPrice,omitempty"`
	Title             string   `json:"title"`
	Includes          []string `json:"includes"`
	Backers           int      `json:"backers"`
	InventoryLimit    *int     `json:"inventoryLimit,omitempty"`
	EstimatedDelivery string   `json:"estimatedDelivery,omitempty"`
	Featured          bool     `json:"featured"`
}

type CampaignSummary struct {
	Slug     string  `json:"slug"`
	Title    string  `json:"title"`
	Category string  `json:"category"`
	Summary  string  `json:"summary"`
	Art      string  `json:"art"`
	Creator  Creator `json:"creator"`
	Goal     int     `json:"goal"`
	Raised   int     `json:"raised"`
	Backers  int     `json:"backers"`
	EndsAt   string  `json:"endsAt"`
	Status   string  `json:"status"`
}

type Campaign struct {
	CampaignSummary
	Story    []StorySection `json:"story"`
	Tiers    []Tier         `json:"tiers"`
	Updates  int            `json:"updates"`
	Comments int            `json:"comments"`
}

var ErrNotFound = errors.New("not found")

// Only these statuses are visible without an admin session. A draft campaign
// must 404 for the public exactly as a non-existent one does.
var publicStatuses = []string{"AKTIV", "FINANSZIROZOTT", "LEZART"}

// A pledge counts towards the total once the card is authorized; released and
// refunded pledges drop back out. The raised amount and the backer count are
// ALWAYS derived from these rows and stored nowhere.
var countedPledges = []string{"AUTHORIZED", "CAPTURED"}

var statusOut = map[string]string{
	"AKTIV":          "aktiv",
	"FINANSZIROZOTT": "finanszirozott",
	"LEZART":         "lezart",
}

var tierTypeOut = map[string]string{
	"DONATION": "donation",
	"DIGITAL":  "digital",
	"PHYSICAL": "physical",
}

func outStatus(s string) string {
	if v, ok := statusOut[s]; ok {
		return v
	}
	return "aktiv"
}

func outTierType(s string) string {
	if v, ok := tierTypeOut[s]; ok {
		return v
	}
	return "donation"
}

func (s *Store) ListCampaigns(ctx context.Context) ([]CampaignSummary, error) {
	rows, err := s.q.ListCampaigns(ctx, dbgen.ListCampaignsParams{
		Counted: countedPledges,
		Public:  publicStatuses,
	})
	if err != nil {
		return nil, err
	}

	out := make([]CampaignSummary, 0, len(rows))
	for _, r := range rows {
		out = append(out, CampaignSummary{
			Slug:     r.Slug,
			Title:    r.Title,
			Category: r.Category,
			Summary:  r.Summary,
			Art:      r.Art,
			Creator: Creator{
				Name:      r.Name,
				Initials:  r.Initials,
				Location:  r.Location,
				Blurb:     r.Blurb,
				AvatarURL: r.AvatarUrl,
			},
			Goal:    r.GoalAmount,
			EndsAt:  s.Day(r.EndsAt),
			Status:  outStatus(r.Status),
			Raised:  r.Raised,
			Backers: r.Backers,
		})
	}
	return out, nil
}

func (s *Store) GetCampaignBySlug(ctx context.Context, slug string) (*Campaign, error) {
	r, err := s.q.GetCampaignBySlug(ctx, dbgen.GetCampaignBySlugParams{
		Counted: countedPledges,
		Slug:    slug,
		Public:  publicStatuses,
	})
	if errors.Is(err, pgx.ErrNoRows) {
		return nil, ErrNotFound
	}
	if err != nil {
		return nil, err
	}

	c := &Campaign{
		CampaignSummary: CampaignSummary{
			Slug:     r.Slug,
			Title:    r.Title,
			Category: r.Category,
			Summary:  r.Summary,
			Art:      r.Art,
			Creator: Creator{
				Name:      r.Name,
				Initials:  r.Initials,
				Location:  r.Location,
				Blurb:     r.Blurb,
				AvatarURL: r.AvatarUrl,
			},
			Goal:    r.GoalAmount,
			EndsAt:  s.Day(r.EndsAt),
			Status:  outStatus(r.Status),
			Raised:  r.Raised,
			Backers: r.Backers,
		},
		Updates:  r.Updates,
		Comments: r.Comments,
	}

	if c.Story, err = s.storySections(ctx, r.ID); err != nil {
		return nil, err
	}

	tiers, err := s.q.ListTiers(ctx, dbgen.ListTiersParams{
		CampaignID: r.ID,
		Counted:    countedPledges,
	})
	if err != nil {
		return nil, err
	}

	c.Tiers = make([]Tier, 0, len(tiers))
	for _, t := range tiers {
		tier := Tier{
			ID:             t.ID,
			Type:           outTierType(t.Type),
			Price:          t.Price,
			ListPrice:      t.ListPrice,
			Title:          t.Title,
			Includes:       t.Includes,
			InventoryLimit: t.InventoryLimit,
			Featured:       t.Featured,
			Backers:        t.Backers,
		}
		if t.EstimatedDelivery != nil {
			tier.EstimatedDelivery = s.Day(*t.EstimatedDelivery)
		}
		c.Tiers = append(c.Tiers, tier)
	}
	return c, nil
}

func (s *Store) storySections(ctx context.Context, campaignID string) ([]StorySection, error) {
	rows, err := s.q.ListStorySections(ctx, campaignID)
	if err != nil {
		return nil, err
	}
	out := make([]StorySection, 0, len(rows))
	for _, r := range rows {
		out = append(out, StorySection{Heading: r.Heading, Body: r.Body})
	}
	return out, nil
}

type PlatformStats struct {
	ActiveCount int `json:"activeCount"`
	Backers     int `json:"backers"`
}

func (s *Store) PlatformStats(ctx context.Context) (PlatformStats, error) {
	r, err := s.q.PlatformStats(ctx, countedPledges)
	if err != nil {
		return PlatformStats{}, err
	}
	return PlatformStats{ActiveCount: r.ActiveCount, Backers: r.Backers}, nil
}