/**
 * Mandates store: governance mandates and their lifecycle steps.
 *
 * Maps to the backend /api/v1/mandates endpoints.
 */

export interface MandateStep {
  id: string
  mandate_id: string
  step_order: number
  step_type: string
  title: string | null
  description: string | null
  status: string
  vote_session_id: string | null
  outcome: string | null
  created_at: string
}

export interface Mandate {
  id: string
  title: string
  description: string | null
  mandate_type: string
  status: string
  mandatee_id: string | null
  decision_id: string | null
  starts_at: string | null
  ends_at: string | null
  created_at: string
  updated_at: string
  steps: MandateStep[]
}

export interface MandateCreate {
  title: string
  description?: string | null
  mandate_type: string
  decision_id?: string | null
  starts_at?: string | null
  ends_at?: string | null
}

export interface MandateUpdate {
  title?: string
  description?: string | null
  mandate_type?: string
  starts_at?: string | null
  ends_at?: string | null
}

export interface MandateStepCreate {
  step_type: string
  title?: string | null
  description?: string | null
}

interface MandatesState {
  list: Mandate[]
  current: Mandate | null
  loading: boolean
  error: string | null
}

export const useMandatesStore = defineStore('mandates', {
  state: (): MandatesState => ({
    list: [],
    current: null,
    loading: false,
    error: null,
  }),

  getters: {
    byStatus: (state) => {
      return (status: string) => state.list.filter(m => m.status === status)
    },
    activeMandates: (state): Mandate[] => {
      return state.list.filter(m => m.status === 'active')
    },
    completedMandates: (state): Mandate[] => {
      return state.list.filter(m => m.status === 'completed')
    },
  },

  actions: {
    /**
     * Fetch all mandates with optional filters.
     */
    async fetchAll(params?: { mandate_type?: string; status?: string }) {
      this.loading = true
      this.error = null

      try {
        const { $api } = useApi()
        const query: Record<string, string> = {}
        if (params?.mandate_type) query.mandate_type = params.mandate_type
        if (params?.status) query.status = params.status

        this.list = await $api<Mandate[]>('/mandates/', { query })
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors du chargement des mandats'
      } finally {
        this.loading = false
      }
    },

    /**
     * Fetch a single mandate by ID with all its steps.
     */
    async fetchById(id: string) {
      this.loading = true
      this.error = null

      try {
        const { $api } = useApi()
        this.current = await $api<Mandate>(`/mandates/${id}`)
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Mandat introuvable'
      } finally {
        this.loading = false
      }
    },

    /**
     * Create a new mandate.
     */
    async create(payload: MandateCreate) {
      this.loading = true
      this.error = null

      try {
        const { $api } = useApi()
        const mandate = await $api<Mandate>('/mandates/', {
          method: 'POST',
          body: payload,
        })
        this.list.unshift(mandate)
        return mandate
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de la creation du mandat'
        throw err
      } finally {
        this.loading = false
      }
    },

    /**
     * Update an existing mandate.
     */
    async update(id: string, data: MandateUpdate) {
      this.error = null

      try {
        const { $api } = useApi()
        const updated = await $api<Mandate>(`/mandates/${id}`, {
          method: 'PUT',
          body: data,
        })
        if (this.current?.id === id) this.current = updated
        const idx = this.list.findIndex(m => m.id === id)
        if (idx >= 0) this.list[idx] = updated
        return updated
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de la mise a jour du mandat'
        throw err
      }
    },

    /**
     * Delete a mandate.
     */
    async delete(id: string) {
      this.error = null

      try {
        const { $api } = useApi()
        await $api(`/mandates/${id}`, { method: 'DELETE' })
        this.list = this.list.filter(m => m.id !== id)
        if (this.current?.id === id) this.current = null
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de la suppression du mandat'
        throw err
      }
    },

    /**
     * Advance the mandate to the next step in its workflow.
     */
    async advance(id: string) {
      this.error = null

      try {
        const { $api } = useApi()
        const updated = await $api<Mandate>(`/mandates/${id}/advance`, {
          method: 'POST',
        })
        if (this.current?.id === id) this.current = updated
        const idx = this.list.findIndex(m => m.id === id)
        if (idx >= 0) this.list[idx] = updated
        return updated
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de l\'avancement du mandat'
        throw err
      }
    },

    /**
     * Add a step to a mandate.
     */
    async addStep(id: string, step: MandateStepCreate) {
      this.error = null

      try {
        const { $api } = useApi()
        const newStep = await $api<MandateStep>(`/mandates/${id}/steps`, {
          method: 'POST',
          body: step,
        })
        if (this.current?.id === id) {
          this.current.steps.push(newStep)
        }
        return newStep
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de l\'ajout de l\'etape'
        throw err
      }
    },

    /**
     * Assign a mandatee to the mandate.
     */
    async assignMandatee(id: string, mandateeId: string) {
      this.error = null

      try {
        const { $api } = useApi()
        const updated = await $api<Mandate>(`/mandates/${id}/assign`, {
          method: 'POST',
          body: { mandatee_id: mandateeId },
        })
        if (this.current?.id === id) this.current = updated
        const idx = this.list.findIndex(m => m.id === id)
        if (idx >= 0) this.list[idx] = updated
        return updated
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de l\'assignation du mandataire'
        throw err
      }
    },

    /**
     * Revoke the mandate.
     */
    async revoke(id: string) {
      this.error = null

      try {
        const { $api } = useApi()
        const updated = await $api<Mandate>(`/mandates/${id}/revoke`, {
          method: 'POST',
        })
        if (this.current?.id === id) this.current = updated
        const idx = this.list.findIndex(m => m.id === id)
        if (idx >= 0) this.list[idx] = updated
        return updated
      } catch (err: any) {
        this.error = err?.data?.detail || err?.message || 'Erreur lors de la revocation du mandat'
        throw err
      }
    },

    /**
     * Clear the current mandate.
     */
    clearCurrent() {
      this.current = null
    },
  },
})